From f7b678505044d0360adb5679b328e2077711e422 Mon Sep 17 00:00:00 2001
From: Maxim Dolgolyov <maxim.dolgolyov@gmail.com>
Date: Sat, 16 May 2026 18:59:38 +0300
Subject: [PATCH] =?UTF-8?q?refactor:=20admin.html=20=E2=80=94=20=D0=B8?=
 =?UTF-8?q?=D0=B7=D0=B2=D0=BB=D0=B5=D1=87=D1=91=D0=BD=20inline=20<script>?=
 =?UTF-8?q?=20=D0=B2=20/js/admin/admin.js?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

admin.html: 5368 → 1922 строк (−64%, −3446 строк)
frontend/js/admin/admin.js: новый файл 3449 строк

Inline <script> блок (1915-5361) был полностью внутри HTML и не
кешировался отдельно — любое изменение HTML инвалидировало
огромный JS, и наоборот. Теперь:

  - HTML загружается быстро (122 КБ vs 270 КБ)
  - JS кешируется независимо (190 КБ; 7d max-age в prod)
  - Любой ctrl+F по JS в редакторе теперь не требует пробираться
    через тысячи строк HTML

Порядок выполнения сохранён байт-в-байт:
  <script src="/js/api.js"></script>
  <script src="/js/sidebar.js"></script>
  <script src="/js/admin/admin.js"></script>      ← было inline
  ... (далее остаётся как было)
  <script src="/js/notifications.js"></script>
  <script src="/js/search.js"></script>
  <script src="/js/mobile.js"></script>

Никаких изменений в логике, scope, DOM-ready timing — чистая
эстетическая операция. Все 22 вкладки + все модалки и обработчики
продолжают работать ровно как раньше.

Это фундамент для дальнейшего сплита (если понадобится): можно
будет в /js/admin/ разнести по табам (sessions.js, classroom.js,
gamification.js и т.д.) с lazy-load по клику. Сейчас не сделано,
т.к. ROI на эстетику ниже, чем у других задач.
---
 frontend/admin.html        | 3448 +----------------------------------
 frontend/js/admin/admin.js | 3449 ++++++++++++++++++++++++++++++++++++
 2 files changed, 3450 insertions(+), 3447 deletions(-)
 create mode 100644 frontend/js/admin/admin.js

diff --git a/frontend/admin.html b/frontend/admin.html
index 3576b5b..8c38483 100644
--- a/frontend/admin.html
+++ b/frontend/admin.html
@@ -1912,3453 +1912,7 @@
 
   <script src="/js/api.js"></script>
   <script src="/js/sidebar.js"></script>
-  <script>
-    const { user, isTeacher, isAdmin } = LS.initPage();
-    if (!isTeacher) { window.location.href = '/dashboard'; throw new Error(); }
-    document.getElementById('page-sub').textContent =
-      isAdmin ? 'Администратор · полный доступ' : 'Учитель · просмотр статистики';
-
-    if (isAdmin) {
-      ['btn-tab-subjects','btn-tab-permissions','btn-tab-shop','btn-tab-gam','btn-tab-tpl','btn-tab-sims','btn-tab-games'].forEach(id => {
-        const el = document.getElementById(id);
-        if (el) el.style.display = '';
-      });
-      document.getElementById('admin-nav-system-sep').style.display = '';
-      document.getElementById('admin-nav-system-label').style.display = '';
-    }
-    LS.showBoardIfAllowed();
-    LS.hideDisabledFeatures?.();
-    LS.notif?.init();
-    const MODES   = { exam:'Экзамен', practice:'Тренировка', repeat:'Обычный', ct:'ЦТ/ЦЭ', topic:'По теме', random:'Случайный' };
-    const DIFFS   = { 1:'Лёгкий', 2:'Средний', 3:'Сложный' };
-
-    function pctClass(p) { return p === null ? '' : p >= 75 ? 'pct-hi' : p >= 50 ? 'pct-mid' : 'pct-lo'; }
-    function fmtDate(d) { return new Date(d).toLocaleDateString('ru',{day:'numeric',month:'short',year:'numeric'}); }
-    function fmtTime(sec) {
-      if (!sec || sec < 0) return '—';
-      const m = Math.floor(sec / 60), s = sec % 60;
-      return m ? `${m} мин ${s} сек` : `${s} сек`;
-    }
-
-    /* ─── Tabs ─── */
-    let questionsInited = false, testsInited = false, assignmentsInited = false, usersInited = false, sessionsInited = false, subjectsInited = false, permissionsInited = false, shopInited = false, gamInited = false, tplInited = false, simsInited = false, gamesInited = false, sublogInited = false;
-    function switchTab(btn) {
-      document.querySelectorAll('.tab-pane').forEach(p => p.classList.remove('active'));
-      document.querySelectorAll('.admin-nav-item').forEach(b => b.classList.remove('active'));
-      const name = btn.dataset.tab;
-      document.getElementById('tab-' + name).classList.add('active');
-      btn.classList.add('active');
-      if (name === 'questions'   && !questionsInited)   { questionsInited = true;   loadQuestions(); }
-      if (name === 'tests'       && !testsInited)       { testsInited = true;       loadTests(); }
-      if (name === 'assignments' && !assignmentsInited) { assignmentsInited = true; loadAssignments(); }
-      if (name === 'subjects'    && !subjectsInited)    { subjectsInited = true;    loadSubjectConfig(); }
-      if (name === 'users'       && !usersInited)       { usersInited = true;       loadUsers(); }
-      if (name === 'sessions'    && !sessionsInited)    { sessionsInited = true;    loadSessions(); }
-      if (name === 'permissions' && !permissionsInited) { permissionsInited = true; loadPermissions(); }
-      if (name === 'shop'        && !shopInited)        { shopInited = true;        loadShopAdmin(); }
-      if (name === 'gam'         && !gamInited)         { gamInited = true;         loadGamAdmin(); }
-      if (name === 'tpl'         && !tplInited)         { tplInited = true;         loadTplAdmin(); }
-      if (name === 'sims'        && !simsInited)        { simsInited = true;         loadSimsAdmin(); }
-      if (name === 'games'       && !gamesInited)       { gamesInited = true;        loadGamesAdmin(); loadFsFeatures(); }
-      if (name === 'sublog'      && !sublogInited)      { sublogInited = true;       loadSubmissionLog(); }
-    }
-
-    /* Переход к вопросам конкретного предмета с открытием формы */
-    async function goAddQuestion(slug) {
-      // переключаем на вкладку Вопросы
-      const qBtn = document.querySelector('[data-tab="questions"]');
-      switchTab(qBtn);
-      // выставляем предмет в фильтре и обновляем список
-      document.getElementById('q-subject').value = slug;
-      if (!questionsInited) { questionsInited = true; }
-      await loadQuestions();
-      // открываем форму с предзаполненным предметом
-      openQModal();
-      document.getElementById('qf-subject').value = slug;
-      await loadQModalTopics();
-    }
-
-    /* ════════════════════════════════════════════════
-       СТАТИСТИКА
-    ════════════════════════════════════════════════ */
-    async function loadStats() {
-      try {
-        const s = await LS.adminGetStats();
-        document.getElementById('stats-grid').innerHTML = `
-          <div class="stat-card" style="--stat-top:var(--violet)">
-            <div class="stat-card-icon" style="background:rgba(155,93,229,0.1)"><i data-lucide="users" class="stat-icon"></i></div>
-            <div class="stat-val violet">${s.totalUsers}</div>
-            <div class="stat-label">Пользователей</div>
-          </div>
-          <div class="stat-card" style="--stat-top:var(--cyan)">
-            <div class="stat-card-icon" style="background:rgba(6,214,224,0.1)"><i data-lucide="file-text" class="stat-icon"></i></div>
-            <div class="stat-val cyan">${s.totalTests}</div>
-            <div class="stat-label">Тестов пройдено</div>
-          </div>
-          <div class="stat-card" style="--stat-top:var(--green)">
-            <div class="stat-card-icon" style="background:rgba(6,214,100,0.1)"><i data-lucide="target" class="stat-icon"></i></div>
-            <div class="stat-val green">${s.avgScore ?? '—'}%</div>
-            <div class="stat-label">Средний результат</div>
-          </div>`;
-        if (window.lucide) lucide.createIcons();
-        const subjEl = document.getElementById('subj-stats');
-        if (!s.bySubject?.length) { subjEl.innerHTML = '<div class="empty">Нет данных</div>'; return; }
-        subjEl.innerHTML = s.bySubject.map(b => {
-          const pct = b.avg_pct ?? 0;
-          const barColor = pct >= 75 ? 'var(--green)' : pct >= 50 ? 'var(--amber)' : 'var(--pink)';
-          return `<div class="subj-stat">
-            <div><div class="subj-stat-name">${esc(b.name)}</div><div class="subj-stat-info">${b.tests} тестов</div></div>
-            <div>
-              <div class="subj-stat-pct">${b.avg_pct ?? '—'}%</div>
-              <div style="width:60px;height:3px;background:rgba(15,23,42,0.06);border-radius:99px;margin-top:5px;overflow:hidden"><div style="width:${pct}%;height:100%;background:${barColor};border-radius:99px"></div></div>
-            </div>
-          </div>`;
-        }).join('');
-      } catch (e) {
-        document.getElementById('stats-grid').innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
-      }
-    }
-
-    /* ════════════════════════════════════════════════
-       РЕДАКТОР ВОПРОСОВ
-    ════════════════════════════════════════════════ */
-    let allQuestions = [];
-    let editingQId   = null;
-    let openQId      = null;
-    let _topicMap    = {};   // topic name (lower) <svg class="ic" viewBox="0 0 24 24"><line x1="5" y1="12" x2="19" y2="12"/><polyline points="12 5 19 12 12 19"/></svg> id, for current subject
-
-    /* ─── KaTeX rendering ─── */
-    const KATEX_OPTS = {
-      delimiters: [
-        { left: '\\(', right: '\\)', display: false },
-        { left: '\\[', right: '\\]', display: true  },
-      ],
-      throwOnError: false,
-    };
-    function renderMath(el) {
-      if (!el) return;
-      const run = () => { if (window.renderMathInElement) renderMathInElement(el, KATEX_OPTS); };
-      if (window._katexReady) run(); else window._katexCb = run;
-    }
-
-    function updateCharCounter(el, cntId, max) {
-      const n = el.value.length;
-      const cnt = document.getElementById(cntId);
-      if (!cnt) return;
-      cnt.textContent = `${n} / ${max}`;
-      cnt.className = 'char-counter' + (n > max * 0.9 ? ' warn' : '') + (n >= max ? ' over' : '');
-    }
-
-    async function onQSubjectChange() {
-      const slug = document.getElementById('q-subject').value;
-      const sel  = document.getElementById('q-topic');
-      sel.innerHTML = '<option value="">Все темы</option>';
-      if (slug) {
-        try {
-          const topics = await LS.getTopics(slug);
-          topics.forEach(t => sel.appendChild(new Option(t.name, t.id)));
-        } catch {}
-      }
-      loadQuestions();
-    }
-
-    async function loadQuestions() {
-      const subject  = document.getElementById('q-subject').value;
-      const topic_id = document.getElementById('q-topic').value;
-      const sort     = document.getElementById('q-sort').value;
-      const wrap     = document.getElementById('q-list-wrap');
-      wrap.innerHTML = LS.skeleton(5);
-      try {
-        allQuestions = await LS.getQuestions(subject || null, topic_id || null, sort);
-        renderQuestions();
-      } catch (e) {
-        wrap.innerHTML = `<div class="error">Ошибка загрузки: ${esc(e.message)}</div>`;
-      }
-    }
-
-    function renderQuestions() {
-      const search   = document.getElementById('q-search').value.toLowerCase();
-      const filtered = search
-        ? allQuestions.filter(q => q.text.toLowerCase().includes(search) || (q.topic||'').toLowerCase().includes(search))
-        : allQuestions;
-
-      document.getElementById('q-count').textContent = `${filtered.length} вопросов`;
-
-      if (!filtered.length) {
-        document.getElementById('q-list-wrap').innerHTML = '<div class="empty">Вопросов не найдено</div>';
-        return;
-      }
-
-      const wrap = document.getElementById('q-list-wrap');
-      wrap.innerHTML =
-        `<div class="q-list">${filtered.map(q => {
-          const diffCls = `diff-${q.difficulty}`;
-          const optsHtml = (q.options || []).map(o =>
-            `<div class="q-opt-row ${o.is_correct ? 'correct' : ''}">
-               <span class="q-opt-icon">${o.is_correct ? '<i data-lucide="check" style="width:13px;height:13px"></i>' : '<svg class="ic" viewBox="0 0 24 24"><circle cx="12" cy="12" r="8"/></svg>'}</span>${esc(o.text)}
-             </div>`).join('');
-          const explHtml = q.explanation
-            ? `<div class="q-expl"><strong>Пояснение:</strong> ${esc(q.explanation)}</div>` : '';
-          return `<div class="q-card" id="qcard-${q.id}">
-            <div class="q-card-head">
-              <span class="q-card-num">#${q.id}</span>
-              <div class="q-card-body" onclick="toggleQDetail(${q.id})">
-                <div class="q-card-text">${esc(q.text)}</div>
-                <div class="q-card-meta">
-                  ${q.subject_name ? `<span class="q-badge q-badge-subj">${esc(q.subject_name)}</span>` : ''}
-                  ${q.topic ? `<span class="q-badge q-badge-topic">${esc(q.topic)}</span>` : ''}
-                  <span class="q-badge ${diffCls}">${DIFFS[q.difficulty]||q.difficulty}</span>
-                  <span style="font-size:0.72rem;color:var(--text-3);background:rgba(15,23,42,0.05);padding:2px 7px;border-radius:999px">${{single:'Один',multi:'Несколько',true_false:'Верно/Неверно',short_answer:'Краткий',matching:'Сопост.'}[q.type]||q.type||'Один'}</span>
-                  <span style="font-size:0.75rem;color:var(--text-3)">${q.options?.length||0} вар.</span>
-                </div>
-              </div>
-              <div class="q-card-actions">
-                <button class="btn-edit-q" onclick="editQ(${q.id})">Изменить</button>
-                <button class="btn-dup-q"  onclick="dupQ(${q.id})" title="Дублировать">⧉</button>
-                <button class="btn-del-q"  onclick="deleteQ(${q.id})" title="Удалить"><i data-lucide="x" style="width:14px;height:14px"></i></button>
-              </div>
-            </div>
-            <div class="q-card-detail" id="qdetail-${q.id}">
-              ${optsHtml}${explHtml}
-            </div>
-          </div>`;
-        }).join('')}</div>`;
-      renderMath(wrap);
-      if (window.lucide) lucide.createIcons();
-    }
-
-    function toggleQDetail(id) {
-      if (openQId === id) {
-        document.getElementById('qdetail-' + id)?.classList.remove('open');
-        openQId = null; return;
-      }
-      if (openQId) document.getElementById('qdetail-' + openQId)?.classList.remove('open');
-      document.getElementById('qdetail-' + id)?.classList.add('open');
-      openQId = id;
-    }
-
-    async function dupQ(id) {
-      try {
-        const { id: newId } = await LS.duplicateQuestion(id);
-        await loadQuestions();
-        // scroll to new card
-        setTimeout(() => document.getElementById('qcard-' + newId)?.scrollIntoView({ behavior:'smooth', block:'center' }), 300);
-      } catch (e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-    }
-
-    async function deleteQ(id) {
-      if (!await LS.confirm(`Удалить вопрос #${id}?`, { title: 'Удалить вопрос', confirmText: 'Удалить' })) return;
-      try {
-        await LS.deleteQuestion(id);
-        allQuestions = allQuestions.filter(q => q.id !== id);
-        renderQuestions();
-      } catch (e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-    }
-
-    /* ─── Question type ─── */
-    let _currentType = 'single';
-    let _matchPairs = []; // [{left:'', right:''}]
-
-    function setQType(type) {
-      _currentType = type;
-      document.querySelectorAll('[data-type]').forEach(b => b.classList.toggle('active', b.dataset.type === type));
-      const isMatching   = type === 'matching';
-      const isShort      = type === 'short_answer';
-      const showOpts     = !isShort && !isMatching;
-      const optsHeader = document.getElementById('qf-opts-header');
-      if (optsHeader) optsHeader.style.display = showOpts ? '' : 'none';
-      document.getElementById('qf-opts').style.display       = showOpts ? '' : 'none';
-      document.getElementById('qf-short-wrap').style.display = isShort    ? '' : 'none';
-      document.getElementById('qf-match-wrap').style.display = isMatching ? '' : 'none';
-      document.getElementById('btn-add-opt').style.display   = showOpts && type !== 'true_false' ? '' : 'none';
-
-      if (type === 'true_false') {
-        initOpts([{ text:'Верно', is_correct:false }, { text:'Неверно', is_correct:false }]);
-      } else if (isShort) {
-        _opts = [];
-      } else if (isMatching) {
-        _opts = [];
-        if (_matchPairs.length === 0) _matchPairs = [{left:'',right:''},{left:'',right:''},{left:'',right:''}];
-        renderMatchRows();
-      } else {
-        if (_opts.length === 0 || _opts[0]?.text === 'Верно') initOpts([{},{},{},{}]);
-        else renderOptRows(_opts);
-      }
-    }
-
-    function renderMatchRows() {
-      const cont = document.getElementById('qf-match-rows');
-      cont.innerHTML = _matchPairs.map((p, i) => `
-        <div style="display:grid;grid-template-columns:1fr 1fr auto;gap:8px;margin-bottom:8px" data-mi="${i}">
-          <input type="text" class="form-ctrl" placeholder="Элемент…" value="${esc(p.left)}"
-            oninput="_matchPairs[${i}].left=this.value" style="margin:0" />
-          <input type="text" class="form-ctrl" placeholder="Пара к нему…" value="${esc(p.right)}"
-            oninput="_matchPairs[${i}].right=this.value" style="margin:0" />
-          <button type="button" onclick="removeMatchPair(${i})" style="border:none;background:none;color:var(--text-3);cursor:pointer;padding:0 6px;display:flex;align-items:center" title="Удалить"><i data-lucide="x" style="width:15px;height:15px"></i></button>
-        </div>`).join('');
-      if (window.lucide) lucide.createIcons();
-    }
-
-    function addMatchPair() {
-      _matchPairs.push({left:'',right:''});
-      renderMatchRows();
-    }
-
-    function removeMatchPair(i) {
-      _matchPairs.splice(i, 1);
-      renderMatchRows();
-    }
-
-    /* ─── Formula bar ─── */
-    let _focusedInput = null;
-    document.addEventListener('focusin', e => {
-      if (e.target.closest && e.target.closest('#q-modal') &&
-          (e.target.tagName === 'TEXTAREA' || (e.target.tagName === 'INPUT' && e.target.type === 'text'))) {
-        _focusedInput = e.target;
-      }
-    });
-
-    function ins(latex) {
-      const el = _focusedInput || document.getElementById('qf-text');
-      if (!el) return;
-      const s = el.selectionStart ?? el.value.length;
-      const e2= el.selectionEnd   ?? el.value.length;
-      const before = el.value.slice(0, s), after = el.value.slice(e2);
-      const opens  = (before.match(/\\\(/g)||[]).length;
-      const closes = (before.match(/\\\)/g)||[]).length;
-      const insert = opens > closes ? latex : `\\(${latex}\\)`;
-      el.value = before + insert + after;
-      el.setSelectionRange(s + insert.length, s + insert.length);
-      el.focus();
-      updateQPreview();
-    }
-
-    function wrapMath() {
-      const el = _focusedInput || document.getElementById('qf-text');
-      if (!el) return;
-      const s = el.selectionStart, e2 = el.selectionEnd;
-      const sel = el.value.slice(s, e2) || 'x';
-      el.value = el.value.slice(0, s) + `\\(${sel}\\)` + el.value.slice(e2);
-      el.focus();
-      updateQPreview();
-    }
-
-    /* ─── Live preview ─── */
-    let _prevTimer = null;
-    function updateQPreview() {
-      clearTimeout(_prevTimer);
-      _prevTimer = setTimeout(() => {
-        const text = document.getElementById('qf-text').value || 'Введите текст вопроса…';
-        const el   = document.getElementById('q-preview-text');
-        el.textContent = text;
-        renderMath(el);
-      }, 150);
-    }
-    // Wire textarea input to preview
-    setTimeout(() => {
-      const ta = document.getElementById('qf-text');
-      if (ta) ta.addEventListener('input', updateQPreview);
-    }, 0);
-
-    /* ─── Dynamic options ─── */
-    const OPT_LETTERS = 'АБВГДЕ';
-
-    function renderOptRows(opts) {
-      const grid    = document.getElementById('qf-opts');
-      const isMulti = _currentType === 'multi';
-      grid.innerHTML = opts.map((o, i) => `
-        <div class="opt-row${o.is_correct ? ' opt-correct' : ''}" data-i="${i}">
-          <span class="opt-letter">${OPT_LETTERS[i]}</span>
-          ${isMulti
-            ? `<input type="checkbox" class="opt-radio" value="${i}" ${o.is_correct ? 'checked' : ''}
-                   onchange="onCheckChange(${i}, this.checked)" />`
-            : `<input type="radio" name="qf-correct" class="opt-radio" value="${i}" ${o.is_correct ? 'checked' : ''}
-                   onchange="onRadioChange(${i})" />`}
-          <input type="text" class="opt-input" placeholder="Вариант ${OPT_LETTERS[i]}"
-                 value="${esc(o.text||'')}" oninput="syncOptText(${i}, this.value)" />
-          ${opts.length > 2
-            ? `<button type="button" class="btn-rem-opt" onclick="removeOpt(${i})" title="Удалить">−</button>`
-            : '<span style="width:24px;flex-shrink:0"></span>'}
-        </div>`).join('');
-      document.getElementById('btn-add-opt').style.display = opts.length >= 6 ? 'none' : '';
-    }
-
-    function onCheckChange(idx, checked) {
-      _opts[idx].is_correct = checked;
-      document.querySelector(`#qf-opts .opt-row[data-i="${idx}"]`)?.classList.toggle('opt-correct', checked);
-    }
-
-    let _opts = [];  // current options state
-
-    function initOpts(opts) {
-      _opts = opts.length ? opts.map(o => ({ text: o.text||'', is_correct: !!o.is_correct }))
-                          : [{text:'',is_correct:false},{text:'',is_correct:false},{text:'',is_correct:false},{text:'',is_correct:false}];
-      renderOptRows(_opts);
-    }
-
-    function onRadioChange(idx) {
-      _opts.forEach((o, i) => o.is_correct = (i === idx));
-      renderOptRows(_opts);
-    }
-
-    function syncOptText(idx, val) { _opts[idx].text = val; }
-
-    function addOpt() {
-      if (_opts.length >= 6) return;
-      _opts.push({ text: '', is_correct: false });
-      renderOptRows(_opts);
-      // focus new input
-      const rows = document.querySelectorAll('#qf-opts .opt-row');
-      rows[rows.length - 1]?.querySelector('input[type=text]')?.focus();
-    }
-
-    function removeOpt(idx) {
-      if (_opts.length <= 2) return;
-      const wasCorrect = _opts[idx].is_correct;
-      _opts.splice(idx, 1);
-      if (wasCorrect && _opts.length > 0) _opts[0].is_correct = true;
-      renderOptRows(_opts);
-    }
-
-    /* ─── Modal ─── */
-    function openQModal(q = null) {
-      editingQId = q ? q.id : null;
-      document.getElementById('q-modal-title').textContent = q ? `Редактировать вопрос #${q.id}` : 'Новый вопрос';
-      const textEl = document.getElementById('qf-text');
-      textEl.value = q?.text || '';
-      updateCharCounter(textEl, 'qf-text-cnt', 500);
-      document.getElementById('qf-explanation').value   = q?.explanation || '';
-      document.getElementById('qf-difficulty').value    = q?.difficulty ?? 2;
-      document.getElementById('qf-subject').value       = q?.subject_slug || '';
-      document.getElementById('qf-topic-text').value    = q?.topic || '';
-      document.getElementById('qf-correct-text').value  = q?.correct_text || '';
-      document.getElementById('qf-error').textContent   = '';
-      const imgVal = q?.image || '';
-      document.getElementById('qf-image').value = imgVal;
-      updateImagePreview(imgVal);
-
-      if (q?.type === 'matching') {
-        _matchPairs = (q.options || []).map(o => ({ left: o.text, right: o.match_pair || '' }));
-        if (!_matchPairs.length) _matchPairs = [{left:'',right:''},{left:'',right:''},{left:'',right:''}];
-      } else {
-        _matchPairs = [];
-      }
-      setQType(q?.type || 'single');
-      if (q?.type !== 'matching') initOpts(q?.options || []);
-      updateQPreview();
-      loadQModalTopics();
-      document.getElementById('q-modal').classList.add('open');
-      setTimeout(() => textEl.focus(), 80);
-    }
-
-    function editQ(id) {
-      const q = allQuestions.find(x => x.id === id);
-      if (q) openQModal(q);
-    }
-
-    function closeQModal() {
-      document.getElementById('q-modal').classList.remove('open');
-      editingQId = null;
-    }
-
-    async function loadQModalTopics() {
-      const slug = document.getElementById('qf-subject').value;
-      const dl   = document.getElementById('qf-topic-list');
-      dl.innerHTML = '';
-      _topicMap = {};
-      if (!slug) return;
-      try {
-        const topics = await LS.getTopics(slug);
-        topics.forEach(t => {
-          dl.appendChild(new Option(t.name));
-          _topicMap[t.name.toLowerCase()] = t.id;
-        });
-      } catch {}
-    }
-
-    async function saveQuestion() {
-      const text         = document.getElementById('qf-text').value.trim();
-      const explanation  = document.getElementById('qf-explanation').value.trim();
-      const difficulty   = Number(document.getElementById('qf-difficulty').value);
-      const subject_slug = document.getElementById('qf-subject').value;
-      const topicText    = document.getElementById('qf-topic-text').value.trim();
-      const type         = _currentType;
-      const errEl        = document.getElementById('qf-error');
-      errEl.textContent  = '';
-
-      if (!subject_slug) { errEl.textContent = 'Выберите предмет'; return; }
-      if (!text)         { errEl.textContent = 'Введите текст вопроса'; return; }
-
-      let options      = null;
-      let correct_text = null;
-
-      if (type === 'short_answer') {
-        correct_text = document.getElementById('qf-correct-text').value.trim();
-        if (!correct_text) { errEl.textContent = 'Введите правильный ответ'; return; }
-      } else if (type === 'matching') {
-        // sync text from DOM inputs
-        document.querySelectorAll('#qf-match-rows [data-mi]').forEach((row, i) => {
-          const [l, r] = row.querySelectorAll('input');
-          if (_matchPairs[i]) { _matchPairs[i].left = l.value.trim(); _matchPairs[i].right = r.value.trim(); }
-        });
-        if (_matchPairs.length < 2) { errEl.textContent = 'Нужно минимум 2 пары'; return; }
-        if (_matchPairs.some(p => !p.left || !p.right)) { errEl.textContent = 'Заполните все пары'; return; }
-        options = _matchPairs.map(p => ({ text: p.left, match_pair: p.right, is_correct: 0 }));
-      } else {
-        // sync any unsaved text from DOM inputs
-        document.querySelectorAll('#qf-opts .opt-row').forEach((row, i) => {
-          if (_opts[i]) _opts[i].text = row.querySelector('input[type=text]').value.trim();
-        });
-        options = _opts.map(o => ({ text: o.text, is_correct: o.is_correct }));
-        if (options.length < 2)           { errEl.textContent = 'Нужно минимум 2 варианта ответа'; return; }
-        if (options.some(o => !o.text))   { errEl.textContent = 'Заполните все варианты ответов'; return; }
-        if (!options.some(o => o.is_correct)) { errEl.textContent = 'Отметьте правильный ответ'; return; }
-      }
-
-      // resolve topic: use id if known, else send topic_name for find-or-create
-      const knownId    = _topicMap[topicText.toLowerCase()];
-      const topic_id   = knownId || null;
-      const topic_name = !knownId && topicText ? topicText : null;
-
-      const image = document.getElementById('qf-image').value.trim() || null;
-
-      const btn = document.getElementById('qf-save');
-      btn.disabled = true; btn.textContent = 'Сохранение…';
-      try {
-        if (editingQId) {
-          await LS.updateQuestion(editingQId, { text, type, correct_text, difficulty, explanation: explanation||null, topic_id, topic_name, options, image });
-        } else {
-          await LS.createQuestion({ subject_slug, topic_id, topic_name, text, type, correct_text, difficulty, explanation: explanation||null, options, image });
-        }
-        closeQModal();
-        loadQuestions();
-      } catch (e) {
-        errEl.textContent = 'Ошибка: ' + e.message;
-      } finally {
-        btn.disabled = false; btn.textContent = 'Сохранить';
-      }
-    }
-
-    /* ── Image upload & preview ── */
-    function updateImagePreview(url) {
-      const wrap = document.getElementById('qf-image-preview');
-      const img  = document.getElementById('qf-image-img');
-      if (url) { img.src = url; wrap.classList.add('visible'); }
-      else     { wrap.classList.remove('visible'); img.src = ''; }
-    }
-
-    function clearQuestionImage() {
-      document.getElementById('qf-image').value = '';
-      updateImagePreview('');
-    }
-
-    async function handleImageFileSelect(input) {
-      const file = input.files[0];
-      if (!file) return;
-      input.value = '';
-      const btn = document.getElementById('btn-img-upload');
-      const lbl = document.getElementById('btn-img-upload-lbl');
-      btn.disabled = true;
-      lbl.textContent = 'Загрузка…';
-      try {
-        const fd = new FormData();
-        fd.append('file', file);
-        fd.append('title', 'Question image: ' + file.name);
-        fd.append('is_public', '1');
-        const res = await fetch('/api/files', {
-          method: 'POST',
-          headers: { Authorization: 'Bearer ' + localStorage.getItem('ls_token') },
-          body: fd
-        });
-        if (!res.ok) throw new Error((await res.json()).error || res.statusText);
-        const { id } = await res.json();
-        const url = `/api/files/${id}/download`;
-        document.getElementById('qf-image').value = url;
-        updateImagePreview(url);
-      } catch (e) {
-        document.getElementById('qf-error').textContent = 'Ошибка загрузки: ' + e.message;
-      } finally {
-        btn.disabled = false;
-        lbl.textContent = 'Загрузить';
-      }
-    }
-
-    document.addEventListener('DOMContentLoaded', () => {
-      const imgInput = document.getElementById('qf-image');
-      if (imgInput) imgInput.addEventListener('input', e => updateImagePreview(e.target.value.trim()));
-    });
-
-    /* ── CSV Import ── */
-    async function importCSVFile(input) {
-      const file = input.files[0];
-      if (!file) return;
-      input.value = '';
-      const fd = new FormData();
-      fd.append('file', file);
-      const btn = document.querySelector('[onclick="document.getElementById(\'csv-file-input\').click()"]');
-      if (btn) { btn.disabled = true; btn.textContent = 'Импорт…'; }
-      try {
-        const { imported, errors } = await LS.importQuestions(fd);
-        LS.toast(`Импортировано: ${imported} вопросов${errors.length ? ` (${errors.length} ошибок)` : ''}`, imported > 0 ? 'success' : 'warn', 5000);
-        loadQuestions();
-      } catch (e) {
-        LS.toast('Ошибка импорта: ' + e.message, 'error');
-      } finally {
-        if (btn) { btn.disabled = false; btn.innerHTML = '<i data-lucide="upload" style="width:14px;height:14px;vertical-align:-2px"></i> Импорт CSV'; if(window.lucide)lucide.createIcons(); }
-      }
-    }
-
-    function downloadCSVTemplate(e) {
-      e.preventDefault();
-      const header = 'subject_slug;topic;text;difficulty;type;opt1;c1;opt2;c2;opt3;c3;opt4;c4;correct_text;explanation;year';
-      const example = [
-        'bio;Клетки;Что является «электростанцией» клетки?;2;single;Митохондрия;1;Рибосома;0;Лизосома;0;Ядро;0;;Митохондрии синтезируют АТФ;2024',
-        'bio;Клетки;Какие органоиды участвуют в синтезе белка?;2;multi;Рибосома;1;Митохондрия;0;Эндоплазматическая сеть;1;Лизосома;0;;',
-        'chem;Кислоты;Формула серной кислоты;1;short_answer;;;;;;;;H2SO4;;',
-      ].join('\n');
-      const blob = new Blob(['\ufeff' + header + '\n' + example], { type: 'text/csv;charset=utf-8' });
-      const a = document.createElement('a');
-      a.href = URL.createObjectURL(blob);
-      a.download = 'questions_template.csv';
-      a.click();
-    }
-
-    /* ════════════════════════════════════════════════
-       ПОЛЬЗОВАТЕЛИ
-    ════════════════════════════════════════════════ */
-    async function loadUsers() {
-      try {
-        const users = await LS.adminGetUsers();
-        const tbody = document.getElementById('users-body');
-        if (!users.length) { tbody.innerHTML = '<tr><td colspan="7"><div class="empty">Пользователей нет</div></td></tr>'; return; }
-        tbody.innerHTML = users.map(u => {
-          const pc = pctClass(u.avg_pct);
-          const initials = (u.name||'?').split(' ').slice(0,2).map(w=>w[0]?.toUpperCase()||'').join('')||'?';
-          const avatarBg = u.role==='admin' ? 'linear-gradient(135deg,#9B5DE5,#c084fc)' : u.role==='teacher' ? 'linear-gradient(135deg,#06D6E0,#9B5DE5)' : u.role==='free_student' ? 'linear-gradient(135deg,#10B981,#059669)' : 'linear-gradient(135deg,#8898AA,#3D4F6B)';
-          const roleCell = isAdmin && u.id !== user.id
-            ? `<select class="role-select" data-uid="${u.id}" onchange="changeRole(this)">
-                <option value="student"      ${u.role==='student'      ?'selected':''}>Ученик</option>
-                <option value="free_student" ${u.role==='free_student' ?'selected':''}>Своб. ученик</option>
-                <option value="teacher"      ${u.role==='teacher'      ?'selected':''}>Учитель</option>
-                <option value="admin"        ${u.role==='admin'        ?'selected':''}>Админ</option>
-               </select>`
-            : `<span class="role-badge ${u.role}">${{student:'Ученик',free_student:'Своб. ученик',teacher:'Учитель',admin:'Админ'}[u.role]||u.role}</span>`;
-          return `<tr class="clickable${u.is_banned ? ' banned-row' : ''}" onclick="openUserPanel(event,${u.id},'${u.role}')">
-            <td>
-              <div style="display:flex;align-items:center;gap:12px">
-                <div style="width:36px;height:36px;border-radius:10px;background:${avatarBg};display:flex;align-items:center;justify-content:center;font-family:'Unbounded',sans-serif;font-size:0.62rem;font-weight:800;color:#fff;flex-shrink:0;${u.is_banned?'filter:grayscale(1);opacity:.5':''}">${initials}</div>
-                <div>
-                  <div style="font-weight:700;font-size:0.88rem;color:var(--text)">${esc(u.name)}${u.is_banned ? ' <span style="font-size:0.7rem;background:rgba(239,68,68,.12);color:#EF4444;border-radius:4px;padding:1px 5px;font-weight:600;vertical-align:middle">заблокирован</span>' : ''}</div>
-                  <div style="color:var(--text-3);font-size:0.76rem">${esc(u.email)}</div>
-                </div>
-              </div>
-            </td>
-            <td onclick="event.stopPropagation()">${roleCell}</td>
-            <td style="font-weight:700">${u.tests_count}</td>
-            <td>
-              <span class="pct-cell ${pc}">${u.avg_pct !== null ? u.avg_pct+'%' : '—'}</span>
-              ${u.avg_pct !== null ? `<div class="perf-bar"><div class="perf-fill ${pc}" style="width:${u.avg_pct}%"></div></div>` : ''}
-            </td>
-            <td style="color:var(--text-3);font-size:0.8rem">${fmtDate(u.created_at)}</td>
-            <td style="color:var(--text-3);font-size:0.8rem">${u.last_login ? new Date(u.last_login).toLocaleDateString('ru',{day:'numeric',month:'short'}) : '—'}</td>
-            <td style="text-align:right;color:var(--text-3);font-size:0.85rem;opacity:0.4">›</td>
-          </tr>`;
-        }).join('');
-      } catch (e) {
-        document.getElementById('users-body').innerHTML = `<tr><td colspan="7" class="error">Ошибка: ${esc(e.message)}</td></tr>`;
-      }
-    }
-
-    async function changeRole(select) {
-      select.disabled = true;
-      try { await LS.adminUpdateRole(select.dataset.uid, select.value); LS.toast('Роль изменена', 'success', 2000); }
-      catch (e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-      finally { select.disabled = false; }
-    }
-
-    let activeTr = null;
-    let activeUid = null;
-    let activeUserRole = null;
-
-    async function openUserPanel(e, uid, role) {
-      if (activeTr) activeTr.classList.remove('selected');
-      activeTr = e.currentTarget; activeTr.classList.add('selected');
-      activeUid = uid;
-      activeUserRole = role;
-      const panel = document.getElementById('user-panel');
-      panel.classList.add('visible');
-      panel.scrollIntoView({ behavior:'smooth', block:'nearest' });
-      document.getElementById('up-sessions').innerHTML = LS.skeleton(3, 'row');
-      document.getElementById('up-name').textContent   = '…';
-      document.getElementById('up-email').textContent  = '';
-      if (isAdmin) {
-        document.getElementById('up-edit-btn').style.display   = '';
-        document.getElementById('up-clear-btn').style.display  = '';
-        document.getElementById('up-perms-btn').style.display  = role === 'teacher' ? '' : 'none';
-        document.getElementById('up-ban-btn').style.display    = '';
-        document.getElementById('up-delete-btn').style.display = '';
-      }
-      await reloadUserPanel(uid);
-    }
-
-    async function reloadUserPanel(uid) {
-      try {
-        const { user: u, sessions } = await LS.adminGetUserSessions(uid);
-        activeUserRole = u.role;
-        document.getElementById('up-name').innerHTML  = LS.esc(u.name) + (u.is_banned ? ' <svg class="ic" viewBox="0 0 24 24"><rect x="3" y="11" width="18" height="11" rx="2" ry="2"/><path d="M7 11V7a5 5 0 0 1 10 0v4"/></svg>' : '');
-        document.getElementById('up-email').textContent = u.email;
-        // Sync button in case role changed after panel was opened
-        if (isAdmin) {
-          document.getElementById('up-perms-btn').style.display = u.role === 'teacher' ? '' : 'none';
-          const banBtn = document.getElementById('up-ban-btn');
-          const banLbl = document.getElementById('up-ban-label');
-          if (u.is_banned) {
-            banBtn.style.background     = 'rgba(34,197,94,.12)';
-            banBtn.style.color          = '#22C55E';
-            banBtn.style.borderColor    = 'rgba(34,197,94,.25)';
-            banLbl.textContent          = 'Разблокировать';
-          } else {
-            banBtn.style.background = '';
-            banBtn.style.color      = '';
-            banBtn.style.borderColor = '';
-            banLbl.textContent      = 'Заблокировать';
-          }
-        }
-        const el = document.getElementById('up-sessions');
-        if (!sessions.length) { el.innerHTML = '<div class="empty">Тестов нет</div>'; return; }
-        el.innerHTML = '<div class="sess-list">' + sessions.map(s => {
-          const pct = s.score !== null ? Math.round((s.score/s.total)*100) : null;
-          return `<div class="sess-item">
-            <div class="sess-pct ${pctClass(pct)}">${pct !== null ? pct+'%' : '—'}</div>
-            <div class="sess-info"><div class="sess-subj">${s.subject_name||'Тест'}</div><div class="sess-meta">${fmtDate(s.started_at)} · ${MODES[s.mode]||s.mode}</div></div>
-            <div class="sess-score">${s.score??'—'} / ${s.total}</div>
-          </div>`;
-        }).join('') + '</div>';
-      } catch (e) { document.getElementById('up-sessions').innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`; }
-    }
-
-    function closeUserPanel() {
-      document.getElementById('user-panel').classList.remove('visible');
-      if (activeTr) { activeTr.classList.remove('selected'); activeTr = null; }
-      activeUid = null;
-    }
-
-    async function clearUserHistory() {
-      const name = document.getElementById('up-name').textContent;
-      if (!await LS.confirm(`Удалить всю историю тестов пользователя «${name}»?\nЭто действие нельзя отменить.`, { title: 'Очистить историю', confirmText: 'Удалить историю' })) return;
-      try {
-        await LS.adminClearUserSessions(activeUid);
-        await reloadUserPanel(activeUid);
-        loadUsers();
-      } catch (e) { LS.toast('Ошибка очистки истории: ' + e.message, 'error'); }
-    }
-
-    async function toggleBanUser() {
-      const banLbl = document.getElementById('up-ban-label');
-      const isBanning = banLbl.textContent === 'Заблокировать';
-      const name = document.getElementById('up-name').innerHTML.replace(' <svg class="ic" viewBox="0 0 24 24"><rect x="3" y="11" width="18" height="11" rx="2" ry="2"/><path d="M7 11V7a5 5 0 0 1 10 0v4"/></svg>','');
-      const msg = isBanning
-        ? `Заблокировать пользователя «${name}»?\nОн не сможет войти в систему.`
-        : `Разблокировать пользователя «${name}»?`;
-      if (!await LS.confirm(msg, { title: isBanning ? 'Блокировка' : 'Разблокировка', confirmText: isBanning ? 'Заблокировать' : 'Разблокировать' })) return;
-      try {
-        await LS.adminBanUser(activeUid, isBanning);
-        LS.toast(isBanning ? 'Пользователь заблокирован' : 'Пользователь разблокирован', isBanning ? 'warning' : 'success');
-        await reloadUserPanel(activeUid);
-        loadUsers();
-      } catch (e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-    }
-
-    async function confirmDeleteUser() {
-      const name = document.getElementById('up-name').innerHTML.replace(' <svg class="ic" viewBox="0 0 24 24"><rect x="3" y="11" width="18" height="11" rx="2" ry="2"/><path d="M7 11V7a5 5 0 0 1 10 0v4"/></svg>','');
-      if (!await LS.confirm(`Удалить пользователя «${name}» навсегда?\nВсе его данные, тесты и прогресс будут удалены. Это действие нельзя отменить.`, { title: 'Удалить пользователя', confirmText: 'Удалить навсегда' })) return;
-      try {
-        await LS.adminDeleteUser(activeUid);
-        LS.toast('Пользователь удалён', 'success');
-        closeUserPanel();
-        loadUsers();
-      } catch (e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-    }
-
-    let _editUid = null;
-    function closeEditUserModal() {
-      document.getElementById('eu-modal').classList.remove('open');
-      _editUid = null;
-    }
-    function openEditUserModal() {
-      _editUid = activeUid;
-      document.getElementById('eu-name').value     = document.getElementById('up-name').textContent;
-      document.getElementById('eu-email').value    = document.getElementById('up-email').textContent;
-      document.getElementById('eu-password').value = '';
-      document.getElementById('eu-error').textContent = '';
-      document.getElementById('eu-modal').classList.add('open');
-      setTimeout(() => document.getElementById('eu-name').focus(), 80);
-    }
-    async function saveEditUser() {
-      const name     = document.getElementById('eu-name').value.trim();
-      const email    = document.getElementById('eu-email').value.trim();
-      const password = document.getElementById('eu-password').value;
-      const errEl    = document.getElementById('eu-error');
-      errEl.textContent = '';
-      if (!name)  { errEl.textContent = 'Введите имя'; return; }
-      if (!email) { errEl.textContent = 'Введите email'; return; }
-      if (password && password.length < 6) { errEl.textContent = 'Пароль должен быть не менее 6 символов'; return; }
-      const payload = { name, email };
-      if (password) payload.password = password;
-      const btn = document.getElementById('eu-save');
-      btn.disabled = true; btn.textContent = 'Сохранение…';
-      try {
-        await LS.adminUpdateUser(_editUid, payload);
-        closeEditUserModal();
-        await reloadUserPanel(activeUid);
-        loadUsers();
-      } catch (e) {
-        errEl.textContent = 'Ошибка: ' + e.message;
-      } finally {
-        btn.disabled = false; btn.textContent = 'Сохранить';
-      }
-    }
-
-    /* ════════════════════════════════════════════════
-       СЕССИИ
-    ════════════════════════════════════════════════ */
-    let allSessions  = [];
-    let openDrawerId = null;
-
-    async function loadSessions() {
-      const subject = document.getElementById('t-subject').value;
-      document.getElementById('t-body').innerHTML = '<div class="spinner"></div>';
-      openDrawerId = null;
-      try {
-        allSessions = await LS.adminGetSessions({ subject: subject || undefined });
-        renderSessions();
-      } catch (e) {
-        document.getElementById('t-body').innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
-      }
-    }
-
-    function sessPctRing(pct) {
-      const pc  = pctClass(pct);
-      const colorMap = {'pct-hi':'var(--green)','pct-mid':'var(--amber)','pct-lo':'var(--pink)'};
-      const color = colorMap[pc] || 'var(--text-3)';
-      const circ = 106.8;
-      const dash = (pct / 100 * circ).toFixed(1);
-      return `<svg class="sess-tl-ring" width="48" height="48" viewBox="0 0 48 48">
-        <circle cx="24" cy="24" r="17" fill="none" stroke="rgba(15,23,42,0.08)" stroke-width="4"/>
-        <circle cx="24" cy="24" r="17" fill="none" stroke="${color}" stroke-width="4"
-          stroke-dasharray="${dash} ${circ}" stroke-dashoffset="26.7" stroke-linecap="round"
-          transform="rotate(-90 24 24)"/>
-        <text x="24" y="28" text-anchor="middle" font-family="Unbounded,sans-serif" font-size="8" font-weight="800" fill="${color}">${pct}%</text>
-      </svg>`;
-    }
-
-    function renderSessions() {
-      const modeF   = document.getElementById('t-mode').value;
-      const searchF = document.getElementById('t-search').value.toLowerCase();
-      const filtered = allSessions.filter(s => {
-        if (modeF && s.mode !== modeF) return false;
-        if (searchF && !s.user_name.toLowerCase().includes(searchF) && !s.user_email.toLowerCase().includes(searchF)) return false;
-        return true;
-      });
-      document.getElementById('t-count').textContent = `${filtered.length} тестов`;
-      if (!filtered.length) {
-        document.getElementById('t-body').innerHTML = '<div class="empty">Нет тестов</div>';
-        return;
-      }
-      // Group by date
-      const groups = {};
-      filtered.forEach(s => {
-        const key = fmtDate(s.started_at);
-        (groups[key] = groups[key] || []).push(s);
-      });
-      document.getElementById('t-body').innerHTML = Object.entries(groups).map(([date, sessions]) =>
-        `<div class="sess-tl-day">${date}</div>
-         <div class="sess-tl-wrap">${sessions.map(s => {
-           const ring = s.percent !== null
-             ? sessPctRing(s.percent)
-             : `<div style="width:48px;height:48px;display:flex;align-items:center;justify-content:center;font-family:'Unbounded',sans-serif;font-size:0.85rem;font-weight:800;color:var(--text-3)">—</div>`;
-           return `<div class="sess-tl-item" id="trow-${s.id}" onclick="toggleDrawer(${s.id})">
-             ${ring}
-             <div class="sess-tl-user">
-               <div class="sess-tl-name">${esc(s.user_name)}</div>
-               <div class="sess-tl-meta">${esc(s.subject_name||'?')} · <span class="mode-badge mode-${s.mode}">${MODES[s.mode]||s.mode}</span></div>
-             </div>
-             <div class="sess-tl-score">${s.score??'—'} / ${s.total}</div>
-             <div class="sess-tl-time">${fmtTime(s.duration_sec)}</div>
-           </div>
-           <div class="sess-tl-drawer" id="tdrawer-${s.id}">
-             <div class="sess-drawer" id="drawer-${s.id}">
-               <div class="sess-drawer-inner" id="drawer-inner-${s.id}"><div class="spinner"></div></div>
-             </div>
-           </div>`;
-         }).join('')}</div>`
-      ).join('');
-    }
-
-    async function toggleDrawer(id) {
-      const drawerEl = document.getElementById('tdrawer-' + id);
-      const drawer   = document.getElementById('drawer-'  + id);
-      const trow     = document.getElementById('trow-'    + id);
-      if (openDrawerId && openDrawerId !== id) {
-        document.getElementById('tdrawer-' + openDrawerId)?.classList.remove('open');
-        document.getElementById('drawer-'  + openDrawerId)?.classList.remove('open');
-        document.getElementById('trow-'    + openDrawerId)?.classList.remove('open');
-      }
-      if (openDrawerId === id) {
-        drawerEl.classList.remove('open'); drawer.classList.remove('open'); trow.classList.remove('open');
-        openDrawerId = null; return;
-      }
-      openDrawerId = id; trow.classList.add('open');
-      drawerEl.classList.add('open');
-      requestAnimationFrame(() => drawer.classList.add('open'));
-      const inner = document.getElementById('drawer-inner-' + id);
-      if (inner.dataset.loaded) return;
-      inner.dataset.loaded = '1';
-      try {
-        const d = await LS.adminGetSessionDetail(id);
-        renderDrawer(inner, d);
-      } catch (e) { inner.innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`; }
-    }
-
-    function renderDrawer(el, d) {
-      const pct     = d.score !== null && d.total ? Math.round((d.score/d.total)*100) : null;
-      const pc      = pctClass(pct);
-      const correct = d.questions.filter(q => q.is_correct).length;
-      const wrong   = d.questions.filter(q => !q.is_correct && q.chosen_option_id).length;
-      const skipped = d.questions.filter(q => !q.chosen_option_id).length;
-      const qHtml   = d.questions.map((q,i) => {
-        const status   = !q.chosen_option_id ? 'skipped' : q.is_correct ? 'correct' : 'wrong';
-        const badgeTxt = { correct:'Верно', wrong:'Неверно', skipped:'Пропущено' }[status];
-        const opts = q.options.map(o => {
-          const isCor = o.is_correct, isCho = o.id === q.chosen_option_id;
-          let cls='', icon='<svg class="ic" viewBox="0 0 24 24"><circle cx="12" cy="12" r="8"/></svg>';
-          if (isCor) { cls='correct-opt'; icon='<i data-lucide="check" style="width:13px;height:13px"></i>'; }
-          else if (isCho && !isCor) { cls='chosen-wrong'; icon='<i data-lucide="x" style="width:13px;height:13px"></i>'; }
-          return `<div class="qb-opt ${cls}"><span class="qb-opt-icon">${icon}</span>${esc(o.text)}</div>`;
-        }).join('');
-        const expl = q.explanation ? `<div class="qb-expl"><strong>Пояснение:</strong> ${esc(q.explanation)}</div>` : '';
-        return `<div class="qb-item ${status}">
-          <div class="qb-header"><span class="qb-qnum">Вопрос ${i+1}</span><span class="qb-badge ${status}">${badgeTxt}</span><span class="qb-time">${q.time_spent_sec?q.time_spent_sec+' сек':''}</span></div>
-          <div class="qb-text">${esc(q.text)}</div>
-          <div class="qb-opts">${opts}</div>${expl}
-        </div>`;
-      }).join('');
-      el.innerHTML = `
-        <div class="drawer-header">
-          <div>
-            <div style="font-family:'Unbounded',sans-serif;font-weight:800;font-size:0.95rem">${esc(d.user_name)}</div>
-            <div class="drawer-meta">${esc(d.user_email)} · ${d.subject_name||'?'} · ${MODES[d.mode]||d.mode} · ${fmtDate(d.started_at)}</div>
-          </div>
-          <div class="drawer-score ${pc}">${pct !== null ? pct+'%' : '—'}</div>
-          <div style="display:flex;gap:20px;margin-left:auto;text-align:center">
-            <div><div style="font-family:'Unbounded',sans-serif;color:var(--green);font-weight:700">${correct}</div><div style="font-size:0.72rem;color:var(--text-3)">Верно</div></div>
-            <div><div style="font-family:'Unbounded',sans-serif;color:var(--pink);font-weight:700">${wrong}</div><div style="font-size:0.72rem;color:var(--text-3)">Неверно</div></div>
-            <div><div style="font-family:'Unbounded',sans-serif;color:var(--text-3);font-weight:700">${skipped}</div><div style="font-size:0.72rem;color:var(--text-3)">Пропущено</div></div>
-            <div><div style="font-family:'Unbounded',sans-serif;color:var(--text-2);font-weight:700">${fmtTime(d.duration_sec)}</div><div style="font-size:0.72rem;color:var(--text-3)">Время</div></div>
-          </div>
-        </div>
-        <div class="qb-list">${qHtml||'<div class="empty">Вопросы не найдены</div>'}</div>`;
-      renderMath(el);
-      if (window.lucide) lucide.createIcons();
-    }
-
-    /* ════════════════════════════════════════════════
-       ТЕСТЫ (ШАБЛОНЫ)
-    ════════════════════════════════════════════════ */
-    let allTests = [];
-    let openTstId = null;
-    let editingTstId = null;
-    const DIFF_LABELS = { 1:'Лёгкий', 2:'Средний', 3:'Сложный' };
-    const TYPE_LABELS = { single:'Один', multi:'Несколько', true_false:'Верно/Нет', short_answer:'Краткий', matching:'Сопоставление' };
-
-    async function loadTests() {
-      const subj = document.getElementById('tst-subj').value;
-      const wrap = document.getElementById('tst-list-wrap');
-      wrap.innerHTML = '<div class="spinner"></div>';
-      try {
-        allTests = await LS.getTests(subj || null);
-        renderTests();
-      } catch (e) {
-        wrap.innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
-      }
-    }
-
-    function renderTests() {
-      const search = document.getElementById('tst-search').value.toLowerCase();
-      const filtered = search ? allTests.filter(t => t.title.toLowerCase().includes(search)) : allTests;
-      document.getElementById('tst-count').textContent = `${filtered.length} тестов`;
-      const wrap = document.getElementById('tst-list-wrap');
-      if (!filtered.length) { wrap.innerHTML = '<div class="empty">Тестов не найдено</div>'; return; }
-      const SUBJ_N = { bio:'Биология', chem:'Химия', math:'Математика', phys:'Физика' };
-      wrap.innerHTML = `<div class="q-list">${filtered.map(t => `
-        <div class="q-card" id="tstcard-${t.id}">
-          <div class="q-card-head">
-            <span class="q-card-num">#${t.id}</span>
-            <div class="q-card-body" onclick="toggleTstDrawer(${t.id})">
-              <div class="q-card-text">${esc(t.title)}</div>
-              <div class="q-card-meta">
-                <span class="q-badge q-badge-subj">${SUBJ_N[t.subject_slug]||t.subject_slug}</span>
-                <span style="font-size:0.75rem;color:var(--text-3)">${t.question_count} вопросов</span>
-                <span style="font-size:0.75rem;color:var(--text-3)">${fmtDate(t.created_at)}</span>
-                ${t.description ? `<span style="font-size:0.75rem;color:var(--text-2)">${esc(t.description)}</span>` : ''}
-              </div>
-            </div>
-            <div class="q-card-actions">
-              <button class="btn-edit-q" onclick="editTst(${t.id})">Изменить</button>
-              <button class="btn-del-q"  onclick="deleteTst(${t.id})" title="Удалить"><i data-lucide="x" style="width:14px;height:14px"></i></button>
-            </div>
-          </div>
-          <div class="tst-drawer" id="tstdrawer-${t.id}" style="display:none">
-            <div class="tst-drawer-inner" id="tstdinner-${t.id}">
-              <div class="spinner"></div>
-            </div>
-          </div>
-        </div>`).join('')}</div>`;
-      if (window.lucide) lucide.createIcons();
-    }
-
-    async function toggleTstDrawer(id) {
-      const drawer = document.getElementById('tstdrawer-' + id);
-      if (!drawer) return;
-      if (openTstId && openTstId !== id) {
-        const old = document.getElementById('tstdrawer-' + openTstId);
-        if (old) old.style.display = 'none';
-      }
-      if (openTstId === id) {
-        drawer.style.display = 'none'; openTstId = null; return;
-      }
-      openTstId = id;
-      drawer.style.display = '';
-      await renderTstDrawer(id);
-    }
-
-    async function renderTstDrawer(id) {
-      const inner = document.getElementById('tstdinner-' + id);
-      if (!inner) return;
-      inner.innerHTML = '<div class="spinner"></div>';
-      try {
-        const [t, subjectQs] = await Promise.all([
-          LS.getTest(id),
-          LS.getQuestions(
-            (_tstPickerCache[id]?.subject_slug) || allTests.find(x => x.id === id)?.subject_slug || '',
-            null, 'date_asc'
-          ).catch(() => []),
-        ]);
-
-        const inIds = new Set(t.questions.map(q => q.id));
-        // Update cache so filterTstPicker can filter locally
-        _tstPickerCache[id] = { subjectQs, inIds, subject_slug: t.subject_slug };
-
-        inner.innerHTML = `
-          <div class="tst-cols">
-            <div>
-              <div class="tst-panel-title">Вопросы в тесте (${t.questions.length})</div>
-              <div class="tst-q-list" id="tstql-${id}">${renderTstQList(t.questions, id)}</div>
-            </div>
-            <div>
-              <div class="tst-panel-title">Добавить вопросы</div>
-              <input class="tst-search" id="tstps-${id}" placeholder="Поиск вопросов…" oninput="filterTstPicker(${id})" />
-              <div class="tst-q-list" id="tstpicker-${id}">${renderTstPicker(subjectQs, inIds, id)}</div>
-            </div>
-          </div>`;
-        renderMath(inner);
-        if (window.lucide) lucide.createIcons();
-      } catch (e) {
-        inner.innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
-      }
-    }
-
-    function qTypeBadge(type) {
-      const MAP = { single:'Один', multi:'Несколько', true_false:'Верно/Нет', short_answer:'Ответ', matching:'Сопост.' };
-      const CLR = { single:'rgba(155,93,229,0.12)', multi:'rgba(6,214,224,0.12)', true_false:'rgba(255,179,71,0.14)', short_answer:'rgba(6,214,100,0.12)', matching:'rgba(241,91,181,0.10)' };
-      const TXT = { single:'var(--violet)', multi:'#05aab3', true_false:'var(--amber)', short_answer:'var(--green)', matching:'var(--pink)' };
-      return `<span class="tst-q-badge" style="background:${CLR[type]||'rgba(15,23,42,0.06)'};color:${TXT[type]||'var(--text-3)'}">${MAP[type]||type}</span>`;
-    }
-
-    function qOptsPreview(q) {
-      if (q.type === 'short_answer') return q.correct_text ? `<span class="tst-q-opts">Ответ: ${esc(q.correct_text)}</span>` : '';
-      if (!q.options?.length) return '';
-      const correct = q.options.filter(o => o.is_correct).map(o => esc(o.text)).join(', ');
-      return `<span class="tst-q-opts"><i data-lucide="check" style="width:12px;height:12px;vertical-align:-2px"></i> ${correct}</span>`;
-    }
-
-    function renderTstQList(questions, tid) {
-      if (!questions.length) return '<div class="tst-empty">Вопросов нет. Добавьте справа <svg class="ic" viewBox="0 0 24 24"><line x1="5" y1="12" x2="19" y2="12"/><polyline points="12 5 19 12 12 19"/></svg></div>';
-      return questions.map((q, i) => `
-        <div class="tst-q-item" id="tstqitem-${tid}-${q.id}">
-          <span class="tst-q-num">${i+1}.</span>
-          <div class="tst-q-body">
-            <span class="tst-q-text">${esc(q.text)}</span>
-            <div class="tst-q-meta">
-              <span class="tst-q-badge diff-${q.difficulty}">${DIFF_LABELS[q.difficulty]||q.difficulty}</span>
-              ${qTypeBadge(q.type)}
-              ${qOptsPreview(q)}
-            </div>
-          </div>
-          <button class="btn-tst-rem" onclick="tstRemoveQ(${tid},${q.id})" title="Убрать">−</button>
-        </div>`).join('');
-    }
-
-    function renderTstPicker(questions, inIds, tid) {
-      if (!questions.length) return '<div class="tst-empty">Вопросов нет в этом предмете</div>';
-      return questions.map(q => {
-        const added = inIds.has(q.id);
-        return `<div class="tst-q-item" id="tstpick-${tid}-${q.id}">
-          <div class="tst-q-body">
-            <span class="tst-q-text">${esc(q.text)}</span>
-            <div class="tst-q-meta">
-              <span class="tst-q-badge diff-${q.difficulty}">${DIFF_LABELS[q.difficulty]||''}</span>
-              ${qTypeBadge(q.type)}
-              ${qOptsPreview(q)}
-            </div>
-          </div>
-          <button class="btn-tst-add${added?' added':''}" id="tstbtn-${tid}-${q.id}"
-                  title="${added?'Уже в тесте':'Добавить'}" ${added?'disabled':'onclick="tstAddQ('+tid+','+q.id+')"'}>${added?'<i data-lucide="check" style="width:14px;height:14px"></i>':'+'}</button>
-        </div>`;
-      }).join('');
-    }
-
-    // Cache for picker: { tid: { subjectQs:[], inIds: Set } }
-    const _tstPickerCache = {};
-
-    async function filterTstPicker(tid) {
-      const search = document.getElementById('tstps-'+tid)?.value.toLowerCase() || '';
-      const cache  = _tstPickerCache[tid];
-      if (!cache) return; // not loaded yet
-      const filtered = search
-        ? cache.subjectQs.filter(q => q.text.toLowerCase().includes(search))
-        : cache.subjectQs;
-      const picker = document.getElementById('tstpicker-'+tid);
-      if (picker) { picker.innerHTML = renderTstPicker(filtered, cache.inIds, tid); renderMath(picker); if(window.lucide)lucide.createIcons(); }
-    }
-
-    async function tstAddQ(tid, qid) {
-      const btn = document.getElementById(`tstbtn-${tid}-${qid}`);
-      if (btn) { btn.disabled = true; btn.textContent = '…'; }
-      try {
-        await LS.addQuestionsToTest(tid, [qid]);
-        const t = allTests.find(x => x.id === tid);
-        if (t) t.question_count++;
-        renderTests();
-        openTstId = tid;
-        document.getElementById('tstdrawer-' + tid).style.display = '';
-        await renderTstDrawer(tid);
-      } catch (e) { LS.toast('Ошибка: ' + e.message, 'error'); if (btn) { btn.disabled=false; btn.textContent='+'; } }
-    }
-
-    async function tstRemoveQ(tid, qid) {
-      try {
-        await LS.removeQFromTest(tid, qid);
-        const t = allTests.find(x => x.id === tid);
-        if (t) t.question_count = Math.max(0, t.question_count - 1);
-        renderTests();
-        openTstId = tid;
-        document.getElementById('tstdrawer-' + tid).style.display = '';
-        await renderTstDrawer(tid);
-      } catch (e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-    }
-
-    /* ── Test modal ── */
-    let _tstShowAnswers = true;
-    function setTstShowAnswers(val) {
-      _tstShowAnswers = val;
-      document.getElementById('tstf-show-yes').classList.toggle('active',  val);
-      document.getElementById('tstf-show-no').classList.toggle('active', !val);
-    }
-
-    function openTstModal(t = null) {
-      editingTstId = t ? t.id : null;
-      document.getElementById('tst-modal-title').textContent = t ? `Редактировать: ${t.title}` : 'Создать тест';
-      document.getElementById('tstf-title').value   = t?.title || '';
-      document.getElementById('tstf-subject').value = t?.subject_slug || '';
-      document.getElementById('tstf-desc').value    = t?.description || '';
-      document.getElementById('tstf-time').value    = t?.time_limit || '';
-      document.getElementById('tstf-error').textContent = '';
-      setTstShowAnswers(t ? (t.show_answers !== 0) : true);
-      document.getElementById('tst-modal').classList.add('open');
-      setTimeout(() => document.getElementById('tstf-title').focus(), 80);
-    }
-
-    function editTst(id) {
-      const t = allTests.find(x => x.id === id);
-      if (t) openTstModal(t);
-    }
-
-    function closeTstModal() {
-      document.getElementById('tst-modal').classList.remove('open');
-      editingTstId = null;
-    }
-
-    async function saveTst() {
-      const title       = document.getElementById('tstf-title').value.trim();
-      const subject_slug= document.getElementById('tstf-subject').value;
-      const description = document.getElementById('tstf-desc').value.trim();
-      const errEl       = document.getElementById('tstf-error');
-      errEl.textContent = '';
-      if (!title)        { errEl.textContent = 'Введите название'; return; }
-      if (!subject_slug) { errEl.textContent = 'Выберите предмет'; return; }
-
-      const btn = document.getElementById('tstf-save');
-      btn.disabled = true; btn.textContent = 'Сохранение…';
-      const show_answers = _tstShowAnswers ? 1 : 0;
-      const timeVal = parseInt(document.getElementById('tstf-time').value, 10);
-      const time_limit = timeVal >= 1 ? Math.min(600, timeVal) : null;
-      try {
-        if (editingTstId) {
-          await LS.updateTest(editingTstId, { title, subject_slug, description: description||null, show_answers, time_limit });
-          const idx = allTests.findIndex(x => x.id === editingTstId);
-          if (idx !== -1) Object.assign(allTests[idx], { title, subject_slug, description, show_answers, time_limit });
-        } else {
-          const { id } = await LS.createTest({ title, subject_slug, description: description||null, show_answers, time_limit });
-          allTests.unshift({ id, title, subject_slug, description, question_count: 0, created_at: new Date().toISOString() });
-          closeTstModal();
-          renderTests();
-          // Auto-open drawer so teacher can immediately add questions
-          openTstId = id;
-          document.getElementById('tstdrawer-' + id).style.display = '';
-          await renderTstDrawer(id);
-          return;
-        }
-        closeTstModal();
-        renderTests();
-      } catch (e) {
-        errEl.textContent = 'Ошибка: ' + e.message;
-      } finally {
-        btn.disabled = false; btn.textContent = 'Сохранить';
-      }
-    }
-
-    async function deleteTst(id) {
-      const t = allTests.find(x => x.id === id);
-      if (!await LS.confirm(`Удалить тест «${t?.title}»?`, { title: 'Удалить тест', confirmText: 'Удалить' })) return;
-      try {
-        await LS.deleteTest(id);
-        allTests = allTests.filter(x => x.id !== id);
-        if (openTstId === id) openTstId = null;
-        renderTests();
-      } catch (e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-    }
-
-    /* ════════════════════════════════════════════════
-       ЗАДАНИЯ
-    ════════════════════════════════════════════════ */
-    let allAssignments  = [];
-    let editingAId      = null;
-    const SUBJ_NAMES    = { bio:'Биология', chem:'Химия', math:'Математика', phys:'Физика' };
-
-    async function loadAssignments() {
-      document.getElementById('a-body').innerHTML = '<div class="spinner"></div>';
-      try {
-        allAssignments = await LS.teacherAssignments();
-        renderAssignments();
-      } catch (e) {
-        document.getElementById('a-body').innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
-      }
-    }
-
-    const SUBJ_COLORS_A = { bio:'#9B5DE5', chem:'#06D6A0', math:'#06B6D4', phys:'#F59E0B' };
-    const SUBJ_ICONS_A  = { bio:'dna', chem:'flask-conical', math:'calculator', phys:'zap' };
-    let _aFilter = 'all';
-
-    function setAFilter(f) {
-      _aFilter = f;
-      document.querySelectorAll('.a-f-chip').forEach(c =>
-        c.classList.toggle('active', c.textContent.trim() === {all:'Все',active:'Активные',overdue:'Просрочены',done:'Завершены'}[f])
-      );
-      renderAssignments();
-    }
-
-    function aClassify(a) {
-      const pct = a.total_members ? Math.round(a.completed_count / a.total_members * 100) : null;
-      if (pct === 100) return 'done';
-      if (a.deadline && new Date(a.deadline) < new Date()) return 'overdue';
-      return 'active';
-    }
-
-    function renderAssignments() {
-      const subjF   = document.getElementById('a-subject').value;
-      const searchF = document.getElementById('a-search').value.toLowerCase();
-      const sortF   = document.getElementById('a-sort')?.value || 'date';
-
-      let list = allAssignments.filter(a => {
-        if (subjF   && a.subject_slug !== subjF) return false;
-        if (searchF && !a.title.toLowerCase().includes(searchF)) return false;
-        if (_aFilter === 'active'  && aClassify(a) !== 'active')  return false;
-        if (_aFilter === 'overdue' && aClassify(a) !== 'overdue') return false;
-        if (_aFilter === 'done'    && aClassify(a) !== 'done')    return false;
-        return true;
-      });
-
-      // Sort
-      list = [...list].sort((a, b) => {
-        if (sortF === 'deadline') {
-          const da = a.deadline ? new Date(a.deadline) : new Date(9e15);
-          const db = b.deadline ? new Date(b.deadline) : new Date(9e15);
-          return da - db;
-        }
-        if (sortF === 'progress_asc') {
-          const pa = a.total_members ? a.completed_count / a.total_members : 0;
-          const pb = b.total_members ? b.completed_count / b.total_members : 0;
-          return pa - pb;
-        }
-        if (sortF === 'progress_desc') {
-          const pa = a.total_members ? a.completed_count / a.total_members : 0;
-          const pb = b.total_members ? b.completed_count / b.total_members : 0;
-          return pb - pa;
-        }
-        return 0; // date: keep server order
-      });
-
-      // Summary chips
-      const all     = allAssignments;
-      const nActive  = all.filter(a => aClassify(a) === 'active').length;
-      const nOverdue = all.filter(a => aClassify(a) === 'overdue').length;
-      const nDone    = all.filter(a => aClassify(a) === 'done').length;
-      document.getElementById('a-summary').innerHTML = [
-        `<span class="a-sum-chip s-all">Всего: ${all.length}</span>`,
-        nActive  ? `<span class="a-sum-chip s-active">Активных: ${nActive}</span>`    : '',
-        nOverdue ? `<span class="a-sum-chip s-overdue">Просрочено: ${nOverdue}</span>` : '',
-        nDone    ? `<span class="a-sum-chip s-done">Завершено: ${nDone}</span>`        : '',
-      ].join('');
-
-      document.getElementById('a-count').textContent = `${list.length} заданий`;
-      const container = document.getElementById('a-body');
-
-      if (!list.length) {
-        container.innerHTML = '<div class="empty">Заданий нет</div>';
-        return;
-      }
-
-      const now = new Date();
-      container.innerHTML = list.map(a => {
-        const pct      = a.total_members ? Math.round(a.completed_count / a.total_members * 100) : null;
-        const cls      = aClassify(a);
-        const rowCls   = cls === 'overdue' ? 'a-overdue' : cls === 'done' ? 'a-done' : '';
-        const sColor   = SUBJ_COLORS_A[a.subject_slug] || '#9B5DE5';
-        const dlMs     = a.deadline ? new Date(a.deadline) - now : Infinity;
-        const isUrgent = cls === 'active' && dlMs > 0 && dlMs < 24 * 3600 * 1000;
-
-        const dl = a.deadline
-          ? new Date(a.deadline).toLocaleDateString('ru', {day:'numeric', month:'short'})
-          : null;
-
-        const targetStr = a.target_user_id
-          ? esc(a.target_user_name || 'Ученик')
-          : esc(a.class_name || '—');
-
-        const metaParts = [
-          targetStr,
-          SUBJ_NAMES[a.subject_slug] || a.subject_slug,
-          `<span class="mode-badge mode-${a.mode}">${MODES[a.mode]||a.mode}</span>`,
-          a.count + ' вопр.',
-          dl ? `до ${dl}` : null,
-          isUrgent  ? `<span class="a-tag-urgent"><i data-lucide="zap" style="width:10px;height:10px;vertical-align:-1px"></i> срочно</span>` : null,
-          cls === 'overdue' ? `<span class="a-tag-over">просрочено</span>` : null,
-        ].filter(Boolean);
-
-        const barColor = pct >= 75 ? '#06D6A0' : pct >= 40 ? '#F59E0B' : '#F15BB5';
-        const pctLabel = pct !== null ? `${pct}%` : '—';
-
-        return `<div class="a-row ${rowCls}${isUrgent ? ' a-urgent' : ''}" style="--ac:${sColor}">
-          <div class="a-icon" style="background:${sColor}18;color:${sColor}"><i data-lucide="${SUBJ_ICONS_A[a.subject_slug]||'file-text'}" style="width:18px;height:18px"></i></div>
-          <div class="a-main">
-            <div class="a-title">${esc(a.title)}</div>
-            <div class="a-meta">${metaParts.join(' · ')}</div>
-          </div>
-          <div class="a-prog">
-            <div class="a-prog-nums">
-              <span>${a.completed_count} / ${a.total_members} сдали</span>
-              <span class="a-prog-pct ${pctClass(pct)}">${pctLabel}</span>
-            </div>
-            <div class="a-prog-bar">
-              <div class="a-prog-fill" style="width:${pct||0}%;background:${barColor}"></div>
-            </div>
-          </div>
-          <div class="a-actions">
-            <button class="btn-edit-q" onclick="openAModal(${a.id})">Изменить</button>
-            <button class="btn-del-q"  onclick="deleteAsgn(${a.id})"><i data-lucide="x" style="width:14px;height:14px"></i></button>
-          </div>
-        </div>`;
-      }).join('');
-      if (window.lucide) lucide.createIcons();
-    }
-
-    let _afSrc = 'random';
-    let _afLoadedTests = [];
-
-    function setAfSrc(src) {
-      _afSrc = src;
-      document.querySelectorAll('[data-afsrc]').forEach(b => b.classList.toggle('active', b.dataset.afsrc === src));
-      document.getElementById('af-random-fields').style.display = src === 'random' ? '' : 'none';
-      document.getElementById('af-test-fields').style.display   = src === 'test'   ? '' : 'none';
-    }
-
-    async function openAModal(id) {
-      const a = allAssignments.find(x => x.id === id);
-      if (!a) return;
-      editingAId = id;
-      document.getElementById('a-modal-title').textContent = `Редактировать: ${a.title}`;
-      document.getElementById('af-title').value    = a.title;
-      document.getElementById('af-deadline').value = a.deadline ? a.deadline.split('T')[0] : '';
-      document.getElementById('af-error').textContent = '';
-
-      // Load tests for the dropdown
-      const testSel = document.getElementById('af-test');
-      testSel.innerHTML = '<option value="">Загрузка…</option>';
-      try {
-        _afLoadedTests = await LS.getTests();
-        testSel.innerHTML = _afLoadedTests.length
-          ? '<option value="">— выберите тест —</option>' + _afLoadedTests.map(t => `<option value="${t.id}">${esc(t.title)} (${t.question_count} вопр.)</option>`).join('')
-          : '<option value="">Нет тестов</option>';
-      } catch {
-        testSel.innerHTML = '<option value="">Ошибка загрузки</option>';
-        _afLoadedTests = [];
-      }
-
-      if (a.test_id) {
-        setAfSrc('test');
-        testSel.value = a.test_id;
-        document.getElementById('af-mode-test').value = a.mode;
-      } else {
-        setAfSrc('random');
-        document.getElementById('af-subject').value = a.subject_slug;
-        document.getElementById('af-mode').value    = a.mode;
-        document.getElementById('af-count').value   = a.count;
-      }
-
-      document.getElementById('a-modal').classList.add('open');
-      setTimeout(() => document.getElementById('af-title').focus(), 80);
-    }
-
-    function closeAModal() {
-      document.getElementById('a-modal').classList.remove('open');
-      editingAId = null;
-    }
-
-    async function saveAssignment() {
-      const title    = document.getElementById('af-title').value.trim();
-      const deadline = document.getElementById('af-deadline').value || null;
-      const errEl    = document.getElementById('af-error');
-      errEl.textContent = '';
-      if (!title) { errEl.textContent = 'Введите название'; return; }
-
-      let payload = { title, deadline };
-
-      if (_afSrc === 'test') {
-        const test_id = document.getElementById('af-test').value;
-        const mode    = document.getElementById('af-mode-test').value;
-        if (!test_id) { errEl.textContent = 'Выберите тест'; return; }
-        const testObj = _afLoadedTests.find(t => t.id === Number(test_id));
-        if (testObj && testObj.question_count === 0) { errEl.textContent = 'В выбранном тесте нет вопросов'; return; }
-        payload = { ...payload, test_id: Number(test_id), mode };
-      } else {
-        const subject_slug = document.getElementById('af-subject').value;
-        const mode         = document.getElementById('af-mode').value;
-        const count        = Number(document.getElementById('af-count').value);
-        if (!subject_slug)       { errEl.textContent = 'Выберите предмет'; return; }
-        if (!count || count < 1) { errEl.textContent = 'Введите количество вопросов'; return; }
-        payload = { ...payload, subject_slug, mode, count, test_id: null };
-      }
-
-      const btn = document.getElementById('af-save');
-      btn.disabled = true; btn.textContent = 'Сохранение…';
-      try {
-        await LS.updateAssignment(editingAId, payload);
-        const idx = allAssignments.findIndex(x => x.id === editingAId);
-        if (idx !== -1) Object.assign(allAssignments[idx], payload);
-        closeAModal();
-        renderAssignments();
-      } catch (e) {
-        errEl.textContent = 'Ошибка: ' + e.message;
-      } finally {
-        btn.disabled = false; btn.textContent = 'Сохранить';
-      }
-    }
-
-    /* ─── Create assignment modal ─── */
-    let _acSrc    = 'random'; // 'random' | 'test'
-    let _acTarget = 'class';  // 'class' | 'user'
-
-    let _acFileId = null, _acAllFiles = null;
-    let _acStudentId = null, _acAllStudents = null;
-
-    function setAcTarget(t) {
-      _acTarget = t;
-      document.querySelectorAll('[data-actgt]').forEach(b => b.classList.toggle('active', b.dataset.actgt === t));
-      document.getElementById('acf-class-field').style.display = t === 'class' ? '' : 'none';
-      document.getElementById('acf-user-field').style.display  = t === 'user'  ? '' : 'none';
-      if (t === 'user' && !_acAllStudents) loadAcStudents();
-    }
-
-    async function loadAcStudents() {
-      const drop = document.getElementById('acf-student-drop');
-      drop.innerHTML = '<div style="padding:8px 12px;font-size:13px;color:#9ca3af">Загрузка…</div>';
-      drop.style.display = '';
-      try {
-        _acAllStudents = await LS.getStudentsList();
-        openAcStudentDrop();
-      } catch(e) {
-        _acAllStudents = [];
-        drop.innerHTML = `<div style="padding:8px 12px;font-size:13px;color:#ef4444">Ошибка загрузки: ${e.message}</div>`;
-      }
-    }
-
-    function filterAcStudents(q) {
-      openAcStudentDrop(q);
-    }
-
-    function openAcStudentDrop(q) {
-      const drop = document.getElementById('acf-student-drop');
-      if (_acAllStudents === null) { loadAcStudents(); return; }
-      const list = _acAllStudents;
-      const term = (q !== undefined ? q : document.getElementById('acf-student-search').value).toLowerCase().trim();
-      const filtered = term ? list.filter(s => s.name.toLowerCase().includes(term) || s.email.toLowerCase().includes(term)) : list;
-      if (!filtered.length) {
-        drop.innerHTML = '<div style="padding:8px 12px;font-size:13px;color:#9ca3af">Нет учеников</div>';
-        drop.style.display = '';
-        return;
-      }
-      drop.innerHTML = filtered.slice(0, 50).map(s =>
-        `<div style="padding:8px 12px;cursor:pointer;border-bottom:1px solid #f3f4f6;font-size:13px" data-id="${s.id}" data-name="${esc(s.name)}" data-email="${esc(s.email)}" onmousedown="selectAcStudent(+this.dataset.id,this.dataset.name,this.dataset.email)" onmouseover="this.style.background='#f9fafb'" onmouseout="this.style.background=''">${esc(s.name)} <span style="color:#9ca3af">${esc(s.email)}</span></div>`
-      ).join('');
-      drop.style.display = '';
-    }
-
-    function closeAcStudentDrop() {
-      document.getElementById('acf-student-drop').style.display = 'none';
-    }
-
-    function selectAcStudent(id, name, email) {
-      _acStudentId = id;
-      document.getElementById('acf-student-search').value = name;
-      document.getElementById('acf-student-selected').textContent = `${name} (${email})`;
-      document.getElementById('acf-student-selected').style.display = '';
-      closeAcStudentDrop();
-    }
-
-    function setAcSrc(src) {
-      _acSrc = src;
-      document.querySelectorAll('[data-src]').forEach(b => b.classList.toggle('active', b.dataset.src === src));
-      document.getElementById('acf-random-fields').style.display = src === 'random' ? '' : 'none';
-      document.getElementById('acf-test-fields').style.display   = src === 'test'   ? '' : 'none';
-      document.getElementById('acf-file-fields').style.display   = src === 'file'   ? '' : 'none';
-      if (src === 'file' && !_acAllFiles) loadAcFiles();
-    }
-
-    async function loadAcFiles() {
-      try {
-        _acAllFiles = await LS.getFiles();
-        renderAcFiles('');
-      } catch { _acAllFiles = []; }
-    }
-
-    function renderAcFiles(q) {
-      const el = document.getElementById('acf-file-list');
-      if (!_acAllFiles) { el.innerHTML = '<div style="padding:10px;color:var(--text-3);font-size:.82rem;text-align:center">Загрузка…</div>'; return; }
-      const lq = q.toLowerCase();
-      const items = q ? _acAllFiles.filter(f => (f.title||'').toLowerCase().includes(lq)) : _acAllFiles;
-      const SUBJ = { bio:'Биология', chem:'Химия', math:'Математика', phys:'Физика' };
-      if (!items.length) { el.innerHTML = '<div style="padding:10px;color:var(--text-3);font-size:.82rem;text-align:center">Нет файлов</div>'; return; }
-      el.innerHTML = items.map(f => `
-        <div onclick="selectAcFile(${f.id},'${esc(f.title||'Файл')}','${f.subject_slug||''}')"
-             style="padding:9px 12px;cursor:pointer;border-bottom:1px solid rgba(15,23,42,0.07);display:flex;align-items:center;gap:8px;${_acFileId===f.id?'background:rgba(155,93,229,0.08);':''} transition:background .15s">
-          <div style="flex:1">
-            <div style="font-size:.84rem;font-weight:600">${esc(f.title||'Файл')}</div>
-            <div style="font-size:.74rem;color:var(--text-3)">${SUBJ[f.subject_slug]||f.subject_slug||''}</div>
-          </div>
-          ${_acFileId===f.id ? '<span style="color:var(--violet)"><i data-lucide="check" style="width:15px;height:15px"></i></span>' : ''}
-        </div>`).join('');
-      if (window.lucide) lucide.createIcons();
-    }
-
-    function filterAcFiles(q) { renderAcFiles(q); }
-
-    function selectAcFile(id, title, subject_slug) {
-      _acFileId = id;
-      renderAcFiles(document.getElementById('acf-file-search').value);
-      const sel = document.getElementById('acf-file-selected');
-      sel.textContent = 'Выбран: ' + title;
-      sel.style.display = '';
-    }
-
-    async function openCreateAModal() {
-      _acSrc = 'random'; _acTarget = 'class'; _acFileId = null; _acStudentId = null; _acAllStudents = null;
-      setAcSrc('random');
-      setAcTarget('class');
-      loadAcStudents(); // preload students so search is ready
-      document.getElementById('acf-title').value          = '';
-      document.getElementById('acf-subject').value         = '';
-      document.getElementById('acf-mode').value            = 'exam';
-      document.getElementById('acf-mode-test').value       = 'exam';
-      document.getElementById('acf-count').value           = '25';
-      document.getElementById('acf-deadline').value        = '';
-      document.getElementById('acf-student-search').value   = '';
-      document.getElementById('acf-student-selected').style.display = 'none';
-      _acStudentId = null;
-      document.getElementById('acf-error').textContent     = '';
-      document.getElementById('acf-file-search').value     = '';
-      document.getElementById('acf-file-selected').style.display = 'none';
-
-      // load classes and tests in parallel
-      const [clsSel, testSel] = [document.getElementById('acf-class'), document.getElementById('acf-test')];
-      clsSel.innerHTML = '<option value="">Загрузка…</option>';
-      testSel.innerHTML = '<option value="">Загрузка…</option>';
-
-      const [classesP, testsP] = await Promise.allSettled([LS.getClasses(), LS.getTests()]);
-
-      if (classesP.status === 'fulfilled') {
-        const classes = classesP.value;
-        clsSel.innerHTML = classes.length
-          ? '<option value="">— выберите класс —</option>' + classes.map(c => `<option value="${c.id}">${esc(c.name)} (${c.member_count} уч.)</option>`).join('')
-          : '<option value="">Нет классов — создайте класс</option>';
-      } else {
-        clsSel.innerHTML = `<option value="">Ошибка загрузки классов</option>`;
-      }
-
-      if (testsP.status === 'fulfilled') {
-        const tests = testsP.value;
-        testSel.innerHTML = tests.length
-          ? '<option value="">— выберите тест —</option>' + tests.map(t => `<option value="${t.id}">${esc(t.title)} (${t.question_count} вопр.)</option>`).join('')
-          : '<option value="">Нет тестов — создайте тест</option>';
-      } else {
-        testSel.innerHTML = `<option value="">Ошибка загрузки тестов</option>`;
-      }
-
-      document.getElementById('ac-modal').classList.add('open');
-      setTimeout(() => document.getElementById('acf-title').focus(), 80);
-    }
-
-    function closeCreateAModal() {
-      document.getElementById('ac-modal').classList.remove('open');
-    }
-
-    async function saveNewAssignment() {
-      const title    = document.getElementById('acf-title').value.trim();
-      const deadline = document.getElementById('acf-deadline').value || null;
-      const errEl    = document.getElementById('acf-error');
-      errEl.textContent = '';
-      if (!title) { errEl.textContent = 'Введите название'; return; }
-
-      let payload = { title, deadline };
-
-      if (_acSrc === 'file') {
-        if (!_acFileId) { errEl.textContent = 'Выберите файл из библиотеки'; return; }
-        const f = _acAllFiles.find(x => x.id === _acFileId);
-        payload = { ...payload, file_id: _acFileId, subject_slug: f?.subject_slug || 'bio', mode: 'exam', count: 1 };
-      } else if (_acSrc === 'test') {
-        const test_id = document.getElementById('acf-test').value;
-        const mode    = document.getElementById('acf-mode-test').value;
-        if (!test_id) { errEl.textContent = 'Выберите тест'; return; }
-        const selOpt = document.querySelector(`#acf-test option[value="${test_id}"]`);
-        if (selOpt && selOpt.textContent.includes('(0 вопр.)')) { errEl.textContent = 'В выбранном тесте нет вопросов. Добавьте вопросы во вкладке «Тесты».'; return; }
-        payload = { ...payload, test_id: Number(test_id), mode };
-      } else {
-        const subject_slug = document.getElementById('acf-subject').value;
-        const mode         = document.getElementById('acf-mode').value;
-        const count        = Number(document.getElementById('acf-count').value);
-        if (!subject_slug) { errEl.textContent = 'Выберите предмет'; return; }
-        if (!count || count < 1) { errEl.textContent = 'Укажите количество вопросов'; return; }
-        payload = { ...payload, subject_slug, mode, count };
-      }
-
-      const btn = document.getElementById('acf-save');
-      btn.disabled = true; btn.textContent = 'Создание…';
-      try {
-        if (_acTarget === 'user') {
-          if (!_acStudentId) { errEl.textContent = 'Выберите ученика из списка'; btn.disabled=false; btn.textContent='Создать'; return; }
-          await LS.createDirectAssignment({ ...payload, student_id: _acStudentId });
-        } else {
-          const class_id = document.getElementById('acf-class').value;
-          if (!class_id) { errEl.textContent = 'Выберите класс'; btn.disabled=false; btn.textContent='Создать'; return; }
-          await LS.createAssignment(class_id, payload);
-        }
-        closeCreateAModal();
-        loadAssignments();
-      } catch (e) {
-        errEl.textContent = 'Ошибка: ' + e.message;
-      } finally {
-        btn.disabled = false; btn.textContent = 'Создать';
-      }
-    }
-
-    async function deleteAsgn(id) {
-      const a = allAssignments.find(x => x.id === id);
-      if (!await LS.confirm(`Удалить задание «${a?.title}»?\nВсе связанные сессии будут удалены.`, { title: 'Удалить задание', confirmText: 'Удалить' })) return;
-      try {
-        await LS.deleteAssignment(id);
-        allAssignments = allAssignments.filter(x => x.id !== id);
-        renderAssignments();
-      } catch (e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-    }
-
-    /* ════════════════════════════════════════════════
-       ДОСТУПНЫЕ ТЕСТЫ — настройка предметов
-    ════════════════════════════════════════════════ */
-    let _subjConfigInited = false;
-    const SC_MODES = { exam: 'Экзамен', practice: 'Пробный тест', topic: 'По теме', random: 'Случайный' };
-    const SC_ICONS  = { bio:'dna', chem:'flask-conical', math:'calculator', phys:'zap' };
-    const SC_COLORS = { bio:'#9B5DE5', chem:'#06D6A0', math:'#06B6D4', phys:'#F59E0B' };
-
-    // кэш тестов по предмету для селектора
-    const _scTests = {};
-    async function loadScTests(slug) {
-      if (_scTests[slug]) return _scTests[slug];
-      const tests = await LS.getTests(slug);
-      _scTests[slug] = tests;
-      return tests;
-    }
-
-    function setSrcMode(slug, src) {
-      const rndBtn  = document.getElementById(`sc-src-rnd-${slug}`);
-      const fixBtn  = document.getElementById(`sc-src-fix-${slug}`);
-      const pick    = document.getElementById(`sc-test-pick-${slug}`);
-      const cntWrap = document.getElementById(`sc-count-wrap-${slug}`);
-      rndBtn.classList.toggle('active', src === 'random');
-      fixBtn.classList.toggle('active', src === 'fixed');
-      pick.classList.toggle('open', src === 'fixed');
-      cntWrap.style.display = src === 'random' ? '' : 'none';
-      if (src === 'fixed') {
-        loadAndRenderTestPick(slug);
-      } else {
-        // скрыть drawer вопросов при переключении на случайный
-        const dr = document.getElementById(`sc-qdr-${slug}`);
-        if (dr) { dr.style.display = 'none'; }
-      }
-    }
-
-    async function loadAndRenderTestPick(slug) {
-      const sel = document.getElementById(`sc-test-sel-${slug}`);
-      if (sel.dataset.loaded) return;
-      sel.innerHTML = '<option value="">Загрузка…</option>';
-      try {
-        const tests = await loadScTests(slug);
-        const cur   = document.getElementById(`sc-card-${slug}`)?.dataset.testId || '';
-        sel.innerHTML = `<option value="">— случайные вопросы —</option>` +
-          tests.map(t => `<option value="${t.id}"${String(t.id) === cur ? ' selected' : ''}>${esc(t.title)} (${t.question_count ?? '?'} вопр.)</option>`).join('');
-        sel.dataset.loaded = '1';
-      } catch(e) {
-        sel.innerHTML = '<option value="">Ошибка загрузки</option>';
-      }
-    }
-
-    async function loadSubjectConfig() {
-      const wrap = document.getElementById('subj-config-list');
-      wrap.innerHTML = LS.skeleton(4);
-      try {
-        const subjects = await LS.getSubjects();
-        wrap.innerHTML = subjects.map(s => {
-          const hasFix = !!s.default_test_id;
-          const color = SC_COLORS[s.slug] || '#9B5DE5';
-          const mode = s.default_mode || 'exam';
-          const count = s.default_count || 25;
-          const srcLabel = hasFix ? 'Фикс. тест' : `${count} вопросов`;
-          return `
-          <div class="sc-card" id="sc-card-${s.slug}" data-test-id="${s.default_test_id || ''}">
-            <div class="sc-row-top" onclick="toggleScCard('${s.slug}')">
-              <div class="sc-icon" style="background:${color}"><i data-lucide="${SC_ICONS[s.slug]||'book'}"></i></div>
-              <div class="sc-info">
-                <div class="sc-name">${esc(s.name)}</div>
-                <div class="sc-summary" id="sc-sum-${s.slug}">
-                  <span class="sc-tag sc-tag-mode">${SC_MODES[mode]}</span>
-                  <span class="sc-tag">${srcLabel}</span>
-                  <span class="sc-qcount">${s.question_count ?? 0} в базе</span>
-                </div>
-              </div>
-              <i data-lucide="chevron-down" class="sc-chevron"></i>
-            </div>
-            <div class="sc-body">
-              <!-- Quick presets -->
-              <div class="sc-presets">
-                <button class="sc-preset${mode==='exam'&&count===25&&!hasFix?' active':''}" onclick="applyPreset('${s.slug}','exam',25)">Экзамен 25</button>
-                <button class="sc-preset${mode==='exam'&&count===40&&!hasFix?' active':''}" onclick="applyPreset('${s.slug}','exam',40)">Экзамен 40</button>
-                <button class="sc-preset${mode==='practice'&&count===15&&!hasFix?' active':''}" onclick="applyPreset('${s.slug}','practice',15)">Практика 15</button>
-                <button class="sc-preset${mode==='practice'&&count===25&&!hasFix?' active':''}" onclick="applyPreset('${s.slug}','practice',25)">Практика 25</button>
-              </div>
-              <!-- Detailed fields -->
-              <div class="sc-fields">
-                <div class="sc-field">
-                  <span class="sc-label">Режим</span>
-                  <select class="sc-select" id="sc-mode-${s.slug}">
-                    ${Object.entries(SC_MODES).map(([v, l]) =>
-                      `<option value="${v}"${mode === v ? ' selected' : ''}>${l}</option>`
-                    ).join('')}
-                  </select>
-                </div>
-                <div class="sc-field">
-                  <span class="sc-label">Источник</span>
-                  <div class="sc-src-toggle">
-                    <button class="sc-src-btn${hasFix ? '' : ' active'}" id="sc-src-rnd-${s.slug}" onclick="setSrcMode('${s.slug}','random')">Случайные</button>
-                    <button class="sc-src-btn${hasFix ? ' active' : ''}" id="sc-src-fix-${s.slug}" onclick="setSrcMode('${s.slug}','fixed')">Из теста</button>
-                  </div>
-                </div>
-                <div class="sc-field" id="sc-count-wrap-${s.slug}" style="${hasFix ? 'display:none' : ''}">
-                  <span class="sc-label">Вопросов</span>
-                  <input class="sc-input" type="number" id="sc-count-${s.slug}" min="5" max="100" value="${count}" />
-                </div>
-                <div class="sc-test-pick${hasFix ? ' open' : ''}" id="sc-test-pick-${s.slug}">
-                  <div class="sc-field">
-                    <span class="sc-label">Тест</span>
-                    <select class="sc-select" id="sc-test-sel-${s.slug}" onchange="onScTestChange('${s.slug}')">
-                      <option value="${s.default_test_id || ''}" selected>Загрузка...</option>
-                    </select>
-                  </div>
-                  <button class="sc-save-add" id="sc-qdr-btn-${s.slug}" style="display:${hasFix?'':'none'};align-self:flex-start"
-                    onclick="toggleScDrawer('${s.slug}')"><i data-lucide="list" style="width:13px;height:13px;vertical-align:-2px"></i> Вопросы</button>
-                </div>
-              </div>
-              <!-- Footer -->
-              <div class="sc-footer">
-                <button class="sc-save" id="sc-save-btn-${s.slug}" onclick="saveSubjectConfig('${s.slug}')">Сохранить</button>
-                <button class="sc-save-add" onclick="goAddQuestion('${s.slug}')"><i data-lucide="plus" style="width:13px;height:13px;vertical-align:-2px"></i> Вопрос</button>
-              </div>
-            </div>
-          </div>
-          <div id="sc-qdr-${s.slug}" style="display:none;border-top:1px solid var(--border);padding:20px 24px;background:rgba(238,242,255,0.5)">
-            <div id="sc-qdr-inner-${s.slug}"></div>
-          </div>`;
-        }).join('');
-        if (window.lucide) lucide.createIcons();
-        // pre-load test selectors and show Вопросы button for subjects already using a fixed test
-        subjects.filter(s => s.default_test_id).forEach(s => {
-          loadAndRenderTestPick(s.slug);
-          const btn = document.getElementById(`sc-qdr-btn-${s.slug}`);
-          if (btn) btn.style.display = '';
-        });
-      } catch (e) {
-        wrap.innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
-      }
-    }
-
-    function toggleScCard(slug) {
-      const card = document.getElementById('sc-card-' + slug);
-      if (!card) return;
-      const wasOpen = card.classList.contains('open');
-      // Close all
-      document.querySelectorAll('.sc-card.open').forEach(c => c.classList.remove('open'));
-      if (!wasOpen) {
-        card.classList.add('open');
-        if (window.lucide) lucide.createIcons({ nodes: [card] });
-      }
-    }
-
-    function applyPreset(slug, mode, count) {
-      document.getElementById('sc-mode-' + slug).value = mode;
-      document.getElementById('sc-count-' + slug).value = count;
-      setSrcMode(slug, 'random');
-      // Highlight active preset
-      const card = document.getElementById('sc-card-' + slug);
-      card.querySelectorAll('.sc-preset').forEach(p => p.classList.remove('active'));
-      const isFix = document.getElementById('sc-src-fix-' + slug).classList.contains('active');
-      card.querySelectorAll('.sc-preset').forEach(p => {
-        const txt = p.textContent.trim();
-        const mLabel = SC_MODES[mode];
-        if (txt === mLabel + ' ' + count && !isFix) p.classList.add('active');
-      });
-      // Auto-save
-      saveSubjectConfig(slug);
-    }
-
-    function updateScSummary(slug) {
-      const el = document.getElementById('sc-sum-' + slug);
-      if (!el) return;
-      const mode = document.getElementById('sc-mode-' + slug).value;
-      const isFix = document.getElementById('sc-src-fix-' + slug).classList.contains('active');
-      const count = document.getElementById('sc-count-' + slug).value;
-      const srcLabel = isFix ? 'Фикс. тест' : count + ' вопросов';
-      el.innerHTML = `<span class="sc-tag sc-tag-mode">${SC_MODES[mode]}</span><span class="sc-tag">${srcLabel}</span>`;
-    }
-
-    function scPreviewText(s) {
-      if (s.default_test_id) return `На дашборде: «${SC_MODES[s.default_mode || 'exam']}», фиксированный тест`;
-      return `На дашборде: «${SC_MODES[s.default_mode || 'exam']}», ${s.default_count || 25} вопросов (случайные)`;
-    }
-
-    async function saveSubjectConfig(slug) {
-      const btn = document.getElementById(`sc-save-btn-${slug}`);
-      const mode   = document.getElementById(`sc-mode-${slug}`).value;
-      const isFix  = document.getElementById(`sc-src-fix-${slug}`).classList.contains('active');
-      const count  = Number(document.getElementById(`sc-count-${slug}`)?.value || 25);
-      const testId = isFix ? (document.getElementById(`sc-test-sel-${slug}`).value || null) : null;
-
-      if (btn) { btn.disabled = true; btn.textContent = '...'; }
-      const payload = { default_mode: mode, default_count: count, default_test_id: testId ? Number(testId) : null };
-      try {
-        await LS.updateSubject(slug, payload);
-        document.getElementById(`sc-card-${slug}`).dataset.testId = testId || '';
-        if (isFix) document.getElementById(`sc-test-sel-${slug}`).dataset.loaded = '';
-        updateScSummary(slug);
-        // Visual feedback
-        if (btn) { btn.classList.add('saved'); btn.textContent = 'Сохранено'; }
-        setTimeout(() => { if (btn) { btn.classList.remove('saved'); btn.textContent = 'Сохранить'; btn.disabled = false; } }, 1500);
-      } catch (e) {
-        LS.toast('Ошибка: ' + e.message, 'error');
-        if (btn) { btn.disabled = false; btn.textContent = 'Сохранить'; }
-      }
-    }
-
-    /* ── Subject drawer: управление вопросами теста ── */
-    function onScTestChange(slug) {
-      const tid = document.getElementById(`sc-test-sel-${slug}`).value;
-      const btn = document.getElementById(`sc-qdr-btn-${slug}`);
-      btn.style.display = tid ? '' : 'none';
-      // скрыть drawer если тест сменился
-      const dr = document.getElementById(`sc-qdr-${slug}`);
-      dr.style.display = 'none';
-      document.getElementById(`sc-qdr-inner-${slug}`).innerHTML = '';
-    }
-
-    const _scDrOpen = {}; // slug <svg class="ic" viewBox="0 0 24 24"><line x1="5" y1="12" x2="19" y2="12"/><polyline points="12 5 19 12 12 19"/></svg> bool
-    async function toggleScDrawer(slug) {
-      const dr  = document.getElementById(`sc-qdr-${slug}`);
-      const tid = Number(document.getElementById(`sc-test-sel-${slug}`).value);
-      if (!tid) return;
-      if (dr.style.display !== 'none') { dr.style.display = 'none'; return; }
-      dr.style.display = '';
-      await renderScDrawer(slug, tid);
-    }
-
-    const _scCache = {}; // tid <svg class="ic" viewBox="0 0 24 24"><line x1="5" y1="12" x2="19" y2="12"/><polyline points="12 5 19 12 12 19"/></svg> { test, subjectQs }
-    async function renderScDrawer(slug, tid) {
-      const inner = document.getElementById(`sc-qdr-inner-${slug}`);
-      inner.innerHTML = LS.skeleton(3, 'row');
-      try {
-        const [t, subjectQs] = await Promise.all([
-          LS.getTest(tid),
-          LS.getQuestions(slug, null, 'date_asc').catch(() => []),
-        ]);
-        _scCache[tid] = { test: t, subjectQs };
-        inner.innerHTML = `
-          <div class="tst-cols">
-            <div>
-              <div class="tst-panel-title">Вопросы в тесте (<span id="sc-qcnt-${tid}">${t.questions.length}</span>)</div>
-              <div class="tst-q-list" id="sc-ql-${tid}">${renderScQList(t.questions, tid, slug)}</div>
-            </div>
-            <div>
-              <div class="tst-panel-title">Добавить из базы</div>
-              <input class="tst-search" placeholder="Поиск…" oninput="filterScPicker(${tid},'${slug}',this.value)" />
-              <div class="tst-q-list" id="sc-pick-${tid}">${renderScPicker(subjectQs, new Set(t.questions.map(q=>q.id)), tid, slug)}</div>
-            </div>
-          </div>`;
-        renderMath(inner);
-      } catch(e) {
-        inner.innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
-      }
-    }
-
-    function renderScQList(questions, tid, slug) {
-      if (!questions.length) return '<div class="tst-empty">Пусто. Добавьте вопросы справа <svg class="ic" viewBox="0 0 24 24"><line x1="5" y1="12" x2="19" y2="12"/><polyline points="12 5 19 12 12 19"/></svg></div>';
-      return questions.map((q,i) => `
-        <div class="tst-q-item" id="sc-qi-${tid}-${q.id}">
-          <span class="tst-q-num">${i+1}.</span>
-          <div class="tst-q-body">
-            <span class="tst-q-text">${esc(q.text)}</span>
-            <div class="tst-q-meta">
-              <span class="tst-q-badge diff-${q.difficulty}">${DIFF_LABELS[q.difficulty]||q.difficulty}</span>
-              ${qTypeBadge(q.type)}
-              ${qOptsPreview(q)}
-            </div>
-          </div>
-          <button class="btn-tst-rem" onclick="scRemoveQ(${tid},'${slug}',${q.id})" title="Убрать">−</button>
-        </div>`).join('');
-    }
-
-    function renderScPicker(questions, inIds, tid, slug) {
-      if (!questions.length) return '<div class="tst-empty">Вопросов нет в этом предмете</div>';
-      return questions.map(q => {
-        const added = inIds.has(q.id);
-        return `
-          <div class="tst-q-item" id="sc-pick-item-${tid}-${q.id}" style="${added?'opacity:0.4;pointer-events:none':''}">
-            <div class="tst-q-body" style="flex:1">
-              <span class="tst-q-text">${esc(q.text)}</span>
-              <div class="tst-q-meta">
-                <span class="tst-q-badge diff-${q.difficulty}">${DIFF_LABELS[q.difficulty]||q.difficulty}</span>
-                ${qTypeBadge(q.type)}
-                ${q.topic ? `<span class="tst-q-badge" style="background:rgba(6,214,224,0.1);color:#05aab3">${esc(q.topic)}</span>` : ''}
-              </div>
-            </div>
-            <button class="btn-tst-add" id="sc-add-btn-${tid}-${q.id}" onclick="scAddQ(${tid},'${slug}',${q.id},this)" title="Добавить">${added?'<i data-lucide="check" style="width:14px;height:14px"></i>':'+' }</button>
-          </div>`;
-      }).join('');
-    }
-
-    function filterScPicker(tid, slug, q) {
-      const cache = _scCache[tid];
-      if (!cache) return;
-      const lq  = q.toLowerCase();
-      const filtered = lq.length < 1
-        ? cache.subjectQs
-        : cache.subjectQs.filter(x => x.text.toLowerCase().includes(lq) || (x.topic||'').toLowerCase().includes(lq));
-      const inIds = new Set(cache.test.questions.map(x=>x.id));
-      document.getElementById(`sc-pick-${tid}`).innerHTML = renderScPicker(filtered, inIds, tid, slug);
-    }
-
-    async function scAddQ(tid, slug, qid, btn) {
-      btn.disabled = true; btn.textContent = '…';
-      try {
-        await LS.addQuestionsToTest(tid, [qid]);
-        // обновить кэш и списки
-        const t = await LS.getTest(tid);
-        _scCache[tid].test = t;
-        const inIds = new Set(t.questions.map(q=>q.id));
-        document.getElementById(`sc-ql-${tid}`).innerHTML   = renderScQList(t.questions, tid, slug);
-        document.getElementById(`sc-qcnt-${tid}`).textContent = t.questions.length;
-        // пометить кнопку в пикере
-        const item = document.getElementById(`sc-pick-item-${tid}-${qid}`);
-        if (item) { item.style.opacity='0.4'; item.style.pointerEvents='none'; }
-        const addBtn = document.getElementById(`sc-add-btn-${tid}-${qid}`);
-        if (addBtn) { addBtn.innerHTML = '<i data-lucide="check" style="width:14px;height:14px"></i>'; if(window.lucide)lucide.createIcons(); }
-        renderMath(document.getElementById(`sc-ql-${tid}`));
-      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); btn.disabled=false; btn.textContent='+'; }
-    }
-
-    async function scRemoveQ(tid, slug, qid) {
-      try {
-        await LS.removeQFromTest(tid, qid);
-        const t = await LS.getTest(tid);
-        _scCache[tid].test = t;
-        const inIds = new Set(t.questions.map(q=>q.id));
-        document.getElementById(`sc-ql-${tid}`).innerHTML    = renderScQList(t.questions, tid, slug);
-        document.getElementById(`sc-qcnt-${tid}`).textContent = t.questions.length;
-        // разблокировать в пикере
-        const item = document.getElementById(`sc-pick-item-${tid}-${qid}`);
-        if (item) { item.style.opacity=''; item.style.pointerEvents=''; }
-        const addBtn = document.getElementById(`sc-add-btn-${tid}-${qid}`);
-        if (addBtn) { addBtn.textContent='+'; addBtn.disabled=false; }
-      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-    }
-
-    /* ─── User permissions modal ───────────────────────────────────────── */
-    let _upPermsData = null;
-
-    function closeUserPermsModal() {
-      document.getElementById('up-modal').classList.remove('open');
-      _upPermsData = null;
-    }
-
-    async function openUserPermsModal() {
-      if (!activeUid) return;
-      const name = document.getElementById('up-name').textContent;
-      document.getElementById('up-modal-title').textContent = `Права: ${name}`;
-      document.getElementById('up-modal-list').innerHTML = LS.skeleton(5, 'row');
-      document.getElementById('up-modal').classList.add('open');
-      try {
-        _upPermsData = await LS.getUserPermissions(activeUid);
-        renderUserPerms();
-      } catch(e) {
-        document.getElementById('up-modal-list').innerHTML = `<p style="color:var(--danger);font-size:13px">Ошибка: ${esc(e.message)}</p>`;
-      }
-    }
-
-    function renderUserPerms() {
-      if (!_upPermsData) return;
-      const list = document.getElementById('up-modal-list');
-      list.innerHTML = _upPermsData.permissions.map(p => {
-        const hasOverride = p.userVal !== undefined;
-        const checked = p.effective;
-        const badge = hasOverride
-          ? `<span style="font-size:10px;padding:2px 7px;border-radius:var(--r-pill);background:rgba(155,93,229,0.12);color:var(--violet);font-weight:700">Инд.</span>`
-          : `<span style="font-size:10px;padding:2px 7px;border-radius:var(--r-pill);background:rgba(136,152,170,0.12);color:var(--text-3);font-weight:700">По роли</span>`;
-        const resetBtn = hasOverride
-          ? `<button style="background:none;border:none;cursor:pointer;color:var(--text-3);padding:3px 6px;border-radius:6px;font-size:11px;font-weight:700;transition:color .2s"
-               onmouseover="this.style.color='var(--danger)'" onmouseout="this.style.color='var(--text-3)'"
-               onclick="doResetOneUserPerm('${esc(p.key)}')" title="Сбросить к роли">×</button>`
-          : '';
-        return `
-          <div class="perm-card${checked ? ' enabled' : ''}" id="up-perm-card-${p.key.replace('.','_')}">
-            <div class="perm-info">
-              <div style="display:flex;align-items:center;gap:7px">
-                <span class="perm-label">${esc(p.label)}</span>
-                ${badge}
-                ${resetBtn}
-              </div>
-              <div class="perm-desc">${esc(p.desc)}</div>
-            </div>
-            <label class="perm-toggle">
-              <input type="checkbox" ${checked ? 'checked' : ''}
-                onchange="doSetUserPerm('${esc(p.key)}', this.checked, this)">
-              <span class="perm-track"></span>
-              <span class="perm-thumb"></span>
-            </label>
-          </div>`;
-      }).join('');
-      // update reset-all btn visibility
-      const hasAny = _upPermsData.permissions.some(p => p.userVal !== undefined);
-      document.getElementById('up-modal-reset-btn').style.opacity = hasAny ? '1' : '0.4';
-    }
-
-    async function doSetUserPerm(key, enabled, checkbox) {
-      checkbox.disabled = true;
-      try {
-        await LS.setUserPermission(activeUid, key, enabled);
-        _upPermsData = await LS.getUserPermissions(activeUid);
-        renderUserPerms();
-        LS.toast(enabled ? 'Право включено' : 'Право отключено', 'success');
-      } catch(e) {
-        checkbox.checked = !enabled;
-        LS.toast('Ошибка: ' + e.message, 'error');
-      } finally {
-        checkbox.disabled = false;
-      }
-    }
-
-    async function doResetOneUserPerm(key) {
-      try {
-        await LS.resetUserPermissions(activeUid, key);
-        _upPermsData = await LS.getUserPermissions(activeUid);
-        renderUserPerms();
-        LS.toast('Сброшено к значению роли', 'success');
-      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-    }
-
-    async function doResetAllUserPerms() {
-      const name = document.getElementById('up-name').textContent;
-      if (!await LS.confirm(`Сбросить все индивидуальные права «${name}»?\nБудут применены права роли.`, { title: 'Сбросить права', confirmText: 'Сбросить' })) return;
-      try {
-        await LS.resetUserPermissions(activeUid);
-        _upPermsData = await LS.getUserPermissions(activeUid);
-        renderUserPerms();
-        LS.toast('Права сброшены к роли', 'success');
-      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-    }
-
-    /* ─── Permissions tab ──────────────────────────────────────────────── */
-    let _permData = null;
-
-    async function loadPermissions() {
-      try {
-        _permData = await LS.getPermissions();
-        renderPermissions();
-      } catch(e) {
-        document.getElementById('perm-teacher').innerHTML =
-          `<p style="color:var(--danger);font-size:13px">Ошибка загрузки: ${esc(e.message)}</p>`;
-      }
-    }
-
-    function renderPermissions() {
-      if (!_permData) return;
-      const { permissions, definitions } = _permData;
-      ['teacher', 'student'].forEach(role => {
-        const container = document.getElementById('perm-' + role);
-        const defs = definitions.filter(d => d.role === role);
-        container.innerHTML = defs.map(def => {
-          const enabled = permissions[role]?.[def.key] ?? def.default;
-          return `
-            <div class="perm-card${enabled ? ' enabled' : ''}" id="perm-card-${role}-${def.key.replace('.','_')}">
-              <div class="perm-info">
-                <div class="perm-label">${esc(def.label)}</div>
-                <div class="perm-desc">${esc(def.desc)}</div>
-              </div>
-              <label class="perm-toggle" title="${enabled ? 'Выключить' : 'Включить'}">
-                <input type="checkbox" ${enabled ? 'checked' : ''}
-                  onchange="togglePermission('${esc(role)}','${esc(def.key)}',this.checked,this)">
-                <span class="perm-track"></span>
-                <span class="perm-thumb"></span>
-              </label>
-            </div>`;
-        }).join('');
-      });
-    }
-
-    async function togglePermission(role, key, enabled, checkbox) {
-      checkbox.disabled = true;
-      try {
-        await LS.setPermission(role, key, enabled);
-        // update local cache
-        if (!_permData.permissions[role]) _permData.permissions[role] = {};
-        _permData.permissions[role][key] = enabled;
-        // update card style
-        const safeKey = key.replace('.', '_');
-        const card = document.getElementById(`perm-card-${role}-${safeKey}`);
-        if (card) card.classList.toggle('enabled', enabled);
-        LS.toast(enabled ? 'Право включено' : 'Право отключено', 'success');
-      } catch(e) {
-        checkbox.checked = !enabled; // revert
-        LS.toast('Ошибка: ' + e.message, 'error');
-      } finally {
-        checkbox.disabled = false;
-      }
-    }
-
-    /* ════════════════════════════════════════════════
-       МАГАЗИН (Shop)
-    ════════════════════════════════════════════════ */
-    let _shopItems = [];
-    let _shopEditId = null;
-
-    async function loadShopAdmin() {
-      try {
-        const [stats, items] = await Promise.all([
-          LS.adminShopStats(),
-          LS.adminShopGetItems()
-        ]);
-        const topName = stats.topItems?.[0]?.name || '—';
-        document.getElementById('shop-stats-grid').innerHTML = `
-          <div class="stat-card" style="--stat-top:var(--violet)">
-            <div class="stat-card-icon" style="background:rgba(155,93,229,0.1)"><i data-lucide="shopping-bag" class="stat-icon"></i></div>
-            <div class="stat-val violet">${stats.activeItems}/${stats.totalItems}</div>
-            <div class="stat-label">Товаров</div>
-          </div>
-          <div class="stat-card" style="--stat-top:var(--cyan)">
-            <div class="stat-card-icon" style="background:rgba(6,214,224,0.1)"><i data-lucide="receipt" class="stat-icon"></i></div>
-            <div class="stat-val cyan">${stats.totalPurchases}</div>
-            <div class="stat-label">Покупок</div>
-          </div>
-          <div class="stat-card" style="--stat-top:var(--green)">
-            <div class="stat-card-icon" style="background:rgba(6,214,100,0.1)"><i data-lucide="coins" class="stat-icon"></i></div>
-            <div class="stat-val green">${stats.totalCoinsInCirculation}</div>
-            <div class="stat-label">Монет в обороте</div>
-          </div>
-          <div class="stat-card" style="--stat-top:var(--amber, #FFB347)">
-            <div class="stat-card-icon" style="background:rgba(255,179,71,0.1)"><i data-lucide="star" class="stat-icon"></i></div>
-            <div class="stat-val" style="color:var(--amber, #FFB347);font-size:1.1rem">${esc(topName)}</div>
-            <div class="stat-label">Топ товар</div>
-          </div>`;
-        _shopItems = items;
-        renderShopItems();
-        if (window.lucide) lucide.createIcons();
-      } catch(e) {
-        document.getElementById('shop-stats-grid').innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
-      }
-    }
-
-    function renderShopItems() {
-      const body = document.getElementById('shop-items-body');
-      if (!_shopItems.length) { body.innerHTML = '<tr><td colspan="7" class="empty">Нет товаров</td></tr>'; return; }
-      const typeLabels = { frame:'Рамка', title:'Титул', theme:'Тема', effect:'Эффект' };
-      body.innerHTML = _shopItems.map(it => `<tr>
-        <td>${it.id}</td>
-        <td><strong>${esc(it.name)}</strong></td>
-        <td><span class="mode-badge mode-practice">${typeLabels[it.type] || esc(it.type)}</span></td>
-        <td>${it.price} <i data-lucide="coins" style="width:12px;height:12px;vertical-align:-2px;color:var(--amber, #FFB347)"></i></td>
-        <td>${it.sold_count || 0}</td>
-        <td>
-          <label class="adm-toggle">
-            <input type="checkbox" ${it.is_active ? 'checked' : ''} onchange="shopAdminToggleActive(${it.id}, this.checked)" />
-            <span class="track"></span><span class="thumb"></span>
-          </label>
-        </td>
-        <td>
-          <button class="btn-edit-q" onclick="shopAdminEditItem(${it.id})">Ред.</button>
-          <button class="btn-del-q" onclick="shopAdminDeleteItem(${it.id})">Удалить</button>
-        </td>
-      </tr>`).join('');
-      if (window.lucide) lucide.createIcons();
-    }
-
-    function shopAdminCreateItem() {
-      _shopEditId = null;
-      document.getElementById('shop-form-title').textContent = 'Новый товар';
-      document.getElementById('shop-f-name').value = '';
-      document.getElementById('shop-f-type').value = 'frame';
-      document.getElementById('shop-f-price').value = '100';
-      document.getElementById('shop-f-desc').value = '';
-      document.getElementById('shop-f-icon').value = '';
-      document.getElementById('shop-f-data').value = '';
-      document.getElementById('shop-f-active').checked = true;
-      document.getElementById('shop-item-form').style.display = '';
-    }
-
-    function shopAdminEditItem(id) {
-      const it = _shopItems.find(i => i.id === id);
-      if (!it) return;
-      _shopEditId = id;
-      document.getElementById('shop-form-title').textContent = 'Редактировать товар #' + id;
-      document.getElementById('shop-f-name').value = it.name || '';
-      document.getElementById('shop-f-type').value = it.type || 'frame';
-      document.getElementById('shop-f-price').value = it.price ?? 100;
-      document.getElementById('shop-f-desc').value = it.description || '';
-      document.getElementById('shop-f-icon').value = it.icon || '';
-      document.getElementById('shop-f-data').value = it.data ? (typeof it.data === 'string' ? it.data : JSON.stringify(it.data)) : '';
-      document.getElementById('shop-f-active').checked = !!it.is_active;
-      document.getElementById('shop-item-form').style.display = '';
-    }
-
-    function shopAdminCancelForm() {
-      document.getElementById('shop-item-form').style.display = 'none';
-      _shopEditId = null;
-    }
-
-    let _shopSaving = false;
-    async function shopAdminSaveItem() {
-      if (_shopSaving) return;
-      _shopSaving = true;
-      const data = {
-        name: document.getElementById('shop-f-name').value.trim(),
-        type: document.getElementById('shop-f-type').value,
-        price: parseInt(document.getElementById('shop-f-price').value) || 0,
-        description: document.getElementById('shop-f-desc').value.trim(),
-        icon: document.getElementById('shop-f-icon').value.trim(),
-        data: document.getElementById('shop-f-data').value.trim() || null,
-        is_active: document.getElementById('shop-f-active').checked ? 1 : 0
-      };
-      if (!data.name) { LS.toast('Введите название', 'error'); return; }
-      try {
-        if (_shopEditId) {
-          await LS.adminShopUpdateItem(_shopEditId, data);
-          LS.toast('Товар обновлён', 'success');
-        } else {
-          await LS.adminShopCreateItem(data);
-          LS.toast('Товар создан', 'success');
-        }
-        shopAdminCancelForm();
-        shopInited = false;
-        loadShopAdmin();
-      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-      finally { _shopSaving = false; }
-    }
-
-    async function shopAdminDeleteItem(id) {
-      if (!await LS.confirm('Все покупки этого товара будут удалены.', { title: 'Удалить товар?', confirmText: 'Удалить', danger: true })) return;
-      try {
-        await LS.adminShopDeleteItem(id);
-        LS.toast('Товар удалён', 'success');
-        shopInited = false;
-        loadShopAdmin();
-      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-    }
-
-    async function shopAdminToggleActive(id, active) {
-      try {
-        await LS.adminShopUpdateItem(id, { is_active: active ? 1 : 0 });
-        LS.toast(active ? 'Товар активирован' : 'Товар деактивирован', 'success');
-      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-    }
-
-    let _shopSearchTimer = null;
-    async function shopSearchUser(q) {
-      clearTimeout(_shopSearchTimer);
-      const box = document.getElementById('shop-award-results');
-      if (q.length < 2) { box.classList.remove('open'); return; }
-      _shopSearchTimer = setTimeout(async () => {
-        try {
-          const r = await LS.adminGetUsers({ q, limit: 8 });
-          box.innerHTML = (r.users || []).map(u => `<div class="us-item" onclick="shopPickUser(${u.id}, '${esc(u.name || u.email)}')">
-            <span>${esc(u.name || u.email)}</span><span class="us-role">${u.role}</span>
-          </div>`).join('') || '<div class="us-item" style="color:var(--text-3)">Не найдено</div>';
-          box.classList.add('open');
-        } catch(e) { box.classList.remove('open'); }
-      }, 300);
-    }
-    function shopPickUser(id, name) {
-      document.getElementById('shop-award-uid').value = id;
-      document.getElementById('shop-award-user').value = name;
-      document.getElementById('shop-award-results').classList.remove('open');
-    }
-
-    let _coinsAwarding = false;
-    async function shopAdminAwardCoins() {
-      if (_coinsAwarding) return;
-      const userId = parseInt(document.getElementById('shop-award-uid').value);
-      const amount = parseInt(document.getElementById('shop-award-amount').value);
-      const reason = document.getElementById('shop-award-reason').value.trim();
-      if (!userId) { LS.toast('Выберите пользователя', 'error'); return; }
-      if (!amount || amount <= 0) { LS.toast('Введите количество монет', 'error'); return; }
-      _coinsAwarding = true;
-      try {
-        const r = await LS.adminShopAwardCoins({ userId, amount, reason });
-        LS.toast(`Начислено ${amount} монет. Баланс: ${r.coins}`, 'success');
-        document.getElementById('shop-award-uid').value = '';
-        document.getElementById('shop-award-user').value = '';
-        document.getElementById('shop-award-reason').value = '';
-      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-      finally { _coinsAwarding = false; }
-    }
-
-    /* ════════════════════════════════════════════════
-       ГЕЙМИФИКАЦИЯ (Gamification)
-    ════════════════════════════════════════════════ */
-    async function loadGamAdmin() {
-      try {
-        const stats = await LS.adminGamStats();
-        document.getElementById('gam-stats-grid').innerHTML = `
-          <div class="stat-card" style="--stat-top:var(--violet)">
-            <div class="stat-card-icon" style="background:rgba(155,93,229,0.1)"><i data-lucide="zap" class="stat-icon"></i></div>
-            <div class="stat-val violet">${stats.totalXP}</div>
-            <div class="stat-label">Суммарный XP</div>
-          </div>
-          <div class="stat-card" style="--stat-top:var(--cyan)">
-            <div class="stat-card-icon" style="background:rgba(6,214,224,0.1)"><i data-lucide="coins" class="stat-icon"></i></div>
-            <div class="stat-val cyan">${stats.totalCoins}</div>
-            <div class="stat-label">Суммарные монеты</div>
-          </div>
-          <div class="stat-card" style="--stat-top:var(--green)">
-            <div class="stat-card-icon" style="background:rgba(6,214,100,0.1)"><i data-lucide="bar-chart-3" class="stat-icon"></i></div>
-            <div class="stat-val green">${(stats.avgLevel ?? 0).toFixed(1)}</div>
-            <div class="stat-label">Средний уровень</div>
-          </div>
-          <div class="stat-card" style="--stat-top:var(--amber, #FFB347)">
-            <div class="stat-card-icon" style="background:rgba(255,179,71,0.1)"><i data-lucide="trophy" class="stat-icon"></i></div>
-            <div class="stat-val" style="color:var(--amber, #FFB347)">${stats.achievementCount}</div>
-            <div class="stat-label">Достижений выдано</div>
-          </div>
-          <div class="stat-card" style="--stat-top:#FF9F1C">
-            <div class="stat-card-icon" style="background:rgba(255,159,28,0.1)"><i data-lucide="shopping-bag" class="stat-icon"></i></div>
-            <div class="stat-val" style="color:#FF9F1C">${stats.totalPurchases || 0}</div>
-            <div class="stat-label">Покупок</div>
-          </div>`;
-
-        // Top-10
-        const topBody = document.getElementById('gam-top-body');
-        if (stats.topByXP?.length) {
-          topBody.innerHTML = stats.topByXP.slice(0, 10).map((u, i) => `<tr>
-            <td><strong>${i + 1}</strong></td>
-            <td>${esc(u.name || u.email || 'ID:' + (u.id || u.user_id))}</td>
-            <td><span style="color:var(--violet);font-weight:700">${u.xp}</span></td>
-            <td>${u.level}</td>
-            <td>${u.coins} <i data-lucide="coins" style="width:12px;height:12px;vertical-align:-2px;color:var(--amber, #FFB347)"></i></td>
-          </tr>`).join('');
-        } else {
-          topBody.innerHTML = '<tr><td colspan="5" class="empty">Нет данных</td></tr>';
-        }
-
-        // Recent XP
-        const XP_REASONS = {
-          'daily_activity': ['sun',          '#F59E0B', 'Ежедневная активность'],
-          'correct_answers':['check-circle', '#10B981', 'Правильные ответы'],
-          'test_complete':  ['file-text',    '#06B6D4', 'Тест завершён'],
-          'test_90+':       ['zap',          '#9B5DE5', 'Тест на 90%+'],
-          'test_perfect':   ['trophy',       '#F59E0B', 'Идеальный тест (100%)'],
-          'lab_experiment': ['atom',         '#06D6A0', 'Лабораторный эксперимент'],
-          'daily_goal':     ['target',       '#EF476F', 'Ежедневная цель выполнена'],
-          'Admin award':    ['crown',        '#9B5DE5', 'Начисление администратором'],
-        };
-        function fmtXPReason(reason) {
-          if (!reason) return '—';
-          const entry = XP_REASONS[reason];
-          if (entry) {
-            const [icon, color, label] = entry;
-            return `<span style="display:inline-flex;align-items:center;gap:5px"><span style="color:${color};display:inline-flex">${lsIcon(icon,14)}</span>${label}</span>`;
-          }
-          if (reason.startsWith('achievement:')) {
-            return `<span style="display:inline-flex;align-items:center;gap:5px"><span style="color:#F59E0B;display:inline-flex">${lsIcon('award',14)}</span>Достижение: ${esc(reason.slice(12))}</span>`;
-          }
-          if (reason.startsWith('Испытание:')) {
-            return `<span style="display:inline-flex;align-items:center;gap:5px"><span style="color:#EF476F;display:inline-flex">${lsIcon('swords',14)}</span>${esc(reason)}</span>`;
-          }
-          return esc(reason);
-        }
-
-        const logBody = document.getElementById('gam-log-body');
-        if (stats.recentXP?.length) {
-          logBody.innerHTML = stats.recentXP.slice(0, 20).map(e => `<tr>
-            <td style="font-size:0.78rem;color:var(--text-3)">${fmtDate(e.created_at || e.date)}</td>
-            <td>${esc(e.name || e.user_name || '—')}</td>
-            <td><span style="color:var(--violet);font-weight:700">+${e.amount}</span></td>
-            <td style="font-size:0.82rem;color:var(--text-2)">${fmtXPReason(e.reason)}</td>
-          </tr>`).join('');
-        } else {
-          logBody.innerHTML = '<tr><td colspan="4" class="empty">Нет данных</td></tr>';
-        }
-
-        // Purchases
-        const purchBody = document.getElementById('gam-purchases-body');
-        if (stats.recentPurchases?.length) {
-          purchBody.innerHTML = stats.recentPurchases.slice(0, 20).map(p => `<tr>
-            <td style="font-size:0.78rem;color:var(--text-3)">${fmtDate(p.purchased_at)}</td>
-            <td>${esc(p.user_name || '—')}</td>
-            <td style="font-weight:600">${esc(p.item_name || '—')}</td>
-            <td><span class="badge" style="font-size:0.7rem">${esc(p.type || '—')}</span></td>
-            <td style="color:var(--amber,#FFB347);font-weight:700">${p.price} <i data-lucide="coins" style="width:12px;height:12px;vertical-align:-2px"></i></td>
-          </tr>`).join('');
-        } else {
-          purchBody.innerHTML = '<tr><td colspan="5" class="empty">Нет покупок</td></tr>';
-        }
-
-        if (window.lucide) lucide.createIcons();
-      } catch(e) {
-        document.getElementById('gam-stats-grid').innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
-      }
-    }
-
-    let _gamSearchTimer = null;
-    async function gamSearchUser(q, prefix) {
-      clearTimeout(_gamSearchTimer);
-      const box = document.getElementById(prefix + '-results');
-      if (q.length < 2) { box.classList.remove('open'); return; }
-      _gamSearchTimer = setTimeout(async () => {
-        try {
-          const r = await LS.adminGetUsers({ q, limit: 8 });
-          box.innerHTML = (r.users || []).map(u => `<div class="us-item" onclick="gamPickUser(${u.id}, '${esc(u.name || u.email)}', '${prefix}')">
-            <span>${esc(u.name || u.email)}</span><span class="us-role">${u.role}</span>
-          </div>`).join('') || '<div class="us-item" style="color:var(--text-3)">Не найдено</div>';
-          box.classList.add('open');
-        } catch(e) { box.classList.remove('open'); }
-      }, 300);
-    }
-    function gamPickUser(id, name, prefix) {
-      document.getElementById(prefix + '-uid').value = id;
-      document.getElementById(prefix + '-user').value = name;
-      document.getElementById(prefix + '-results').classList.remove('open');
-    }
-
-    let _gamAwarding = false;
-    async function gamAdminAward() {
-      if (_gamAwarding) return;
-      const userId = parseInt(document.getElementById('gam-award-uid').value);
-      const xp = parseInt(document.getElementById('gam-award-xp').value) || 0;
-      const coins = parseInt(document.getElementById('gam-award-coins').value) || 0;
-      const reason = document.getElementById('gam-award-reason').value.trim();
-      if (!userId) { LS.toast('Выберите пользователя', 'error'); return; }
-      if (!xp && !coins) { LS.toast('Введите XP или монеты', 'error'); return; }
-      _gamAwarding = true;
-      try {
-        const r = await LS.adminGamAward({ userId, xp, coins, reason });
-        LS.toast(`Начислено! XP: ${r.xp}, Уровень: ${r.level}, Монеты: ${r.coins}`, 'success');
-        document.getElementById('gam-award-uid').value = '';
-        document.getElementById('gam-award-user').value = '';
-        document.getElementById('gam-award-reason').value = '';
-        gamInited = false;
-        loadGamAdmin();
-      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-      finally { _gamAwarding = false; }
-    }
-
-    async function gamAdminReset() {
-      const userId = parseInt(document.getElementById('gam-reset-uid').value);
-      const userName = document.getElementById('gam-reset-user').value;
-      if (!userId) { LS.toast('Выберите пользователя', 'error'); return; }
-      if (!await LS.confirm(`ВСЕ XP, монеты и достижения «${userName}» будут удалены безвозвратно.`, { title: 'Сбросить прогресс?', confirmText: 'Сбросить', danger: true })) return;
-      try {
-        await LS.adminGamReset({ userId });
-        LS.toast('Прогресс сброшен', 'success');
-        document.getElementById('gam-reset-uid').value = '';
-        document.getElementById('gam-reset-user').value = '';
-        gamInited = false;
-        loadGamAdmin();
-      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-    }
-
-    /* ════════════════════════════════════════════════
-       ШАБЛОНЫ (Templates)
-    ════════════════════════════════════════════════ */
-    async function loadTplAdmin() {
-      try {
-        const [courses, lessons] = await Promise.all([
-          LS.getCourseTemplates().catch(() => []),
-          LS.getLessonTemplates().catch(() => [])
-        ]);
-        renderTplTable('tpl-course-body', courses, 'courses');
-        renderTplTable('tpl-lesson-body', lessons, 'lessons');
-        if (window.lucide) lucide.createIcons();
-      } catch(e) {
-        document.getElementById('tpl-course-body').innerHTML = `<tr><td colspan="7" class="error">Ошибка: ${esc(e.message)}</td></tr>`;
-      }
-    }
-
-    function renderTplTable(bodyId, items, type) {
-      const body = document.getElementById(bodyId);
-      if (!items || !items.length) {
-        body.innerHTML = '<tr><td colspan="7" class="empty">Нет шаблонов</td></tr>';
-        return;
-      }
-      body.innerHTML = items.map(t => `<tr>
-        <td>${t.id}</td>
-        <td><strong>${esc(t.name || t.title || '—')}</strong></td>
-        <td>${esc(t.subject || '—')}</td>
-        <td>${esc(t.category || '—')}</td>
-        <td>${esc(t.author_name || t.author || '—')}</td>
-        <td>
-          <label class="adm-toggle">
-            <input type="checkbox" ${t.is_public ? 'checked' : ''} onchange="tplTogglePublic('${type}', ${t.id}, this.checked)" />
-            <span class="track"></span><span class="thumb"></span>
-          </label>
-        </td>
-        <td>
-          <button class="btn-del-q" onclick="tplDelete('${type}', ${t.id})">Удалить</button>
-        </td>
-      </tr>`).join('');
-    }
-
-    async function tplTogglePublic(type, id, isPublic) {
-      try {
-        const endpoint = type === 'courses' ? '/api/templates/courses/' : '/api/templates/lessons/';
-        await LS.api(endpoint + id, { method: 'PUT', body: JSON.stringify({ is_public: isPublic ? 1 : 0 }) });
-        LS.toast(isPublic ? 'Шаблон опубликован' : 'Шаблон скрыт', 'success');
-      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-    }
-
-    async function tplDelete(type, id) {
-      if (!confirm('Удалить шаблон #' + id + '?')) return;
-      try {
-        if (type === 'courses') await LS.deleteCourseTemplate(id);
-        else await LS.deleteLessonTemplate(id);
-        LS.toast('Шаблон удалён', 'success');
-        tplInited = false;
-        loadTplAdmin();
-      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-    }
-
-    /* ════════════════════════════════════════════════
-       СИМУЛЯЦИИ
-    ════════════════════════════════════════════════ */
-
-    // Full list of available (non-null id) sims mirrored from /lab
-    const ADMIN_SIMS = [
-      { id: 'graph',          cat: 'Математика', title: 'График функции' },
-      { id: 'graphtransform', cat: 'Математика', title: 'Трансформации графиков' },
-      { id: 'geometry',       cat: 'Математика', title: 'Планиметрия' },
-      { id: 'triangle',       cat: 'Математика', title: 'Геометрия треугольника' },
-      { id: 'quadratic',      cat: 'Математика', title: 'Корни квадратного уравнения' },
-      { id: 'stereo',         cat: 'Математика', title: 'Стереометрия 3D' },
-      { id: 'probability',    cat: 'Математика', title: 'Теория вероятностей' },
-      { id: 'trigcircle',     cat: 'Математика', title: 'Тригонометрическая окружность' },
-      { id: 'normaldist',     cat: 'Математика', title: 'Нормальное распределение' },
-      { id: 'projectile',     cat: 'Физика',     title: 'Бросок тела' },
-      { id: 'pendulum',       cat: 'Физика',     title: 'Маятник' },
-      { id: 'collision',      cat: 'Физика',     title: 'Столкновение шаров' },
-      { id: 'magnetic',       cat: 'Физика',     title: 'Магнитное поле токов' },
-      { id: 'circuit',        cat: 'Физика',     title: 'Электрические цепи' },
-      { id: 'coulomb',        cat: 'Физика',     title: 'Закон Кулона' },
-      { id: 'hydrostatics',   cat: 'Физика',     title: 'Гидростатика' },
-      { id: 'dynamics',       cat: 'Физика',     title: 'Динамика' },
-      { id: 'thinlens',       cat: 'Физика',     title: 'Тонкая линза' },
-      { id: 'refraction',     cat: 'Физика',     title: 'Преломление света' },
-      { id: 'mirrors',        cat: 'Физика',     title: 'Зеркала' },
-      { id: 'isoprocess',     cat: 'Физика',     title: 'Изопроцессы' },
-      { id: 'waves',          cat: 'Физика',     title: 'Волны и звук' },
-      { id: 'molphys',        cat: 'Химия',      title: 'Молекулярная физика' },
-      { id: 'chemistry',      cat: 'Химия',      title: 'Химические реакции' },
-      { id: 'equilibrium',    cat: 'Химия',      title: 'Химическое равновесие' },
-      { id: 'electrolysis',   cat: 'Химия',      title: 'Электролиз' },
-      { id: 'bohratom',       cat: 'Химия',      title: 'Атом Бора' },
-      { id: 'orbitals',       cat: 'Химия',      title: 'Молекулярные орбитали' },
-      { id: 'titration',      cat: 'Химия',      title: 'pH и кривая титрования' },
-      { id: 'chemsandbox',    cat: 'Химия',      title: 'Химическая песочница' },
-      { id: 'crystal',        cat: 'Химия',      title: 'Кристаллическая решётка' },
-      { id: 'celldivision',   cat: 'Биология',   title: 'Деление клетки' },
-      { id: 'photosynthesis', cat: 'Биология',   title: 'Фотосинтез и дыхание' },
-      { id: 'angrybirds',     cat: 'Игры',       title: 'Angry Birds Physics' },
-    ];
-
-    let _simsSettings = { module_disabled: false, disabled_ids: [] };
-
-    async function loadSimsAdmin() {
-      try {
-        const data = await LS.api('/api/settings/sims');
-        _simsSettings = data;
-        _renderSimsAdmin();
-      } catch(e) { LS.toast('Ошибка загрузки настроек: ' + e.message, 'error'); }
-    }
-
-    function _renderSimsAdmin() {
-      // master toggle
-      const masterChk = document.getElementById('sims-master-chk');
-      if (masterChk) masterChk.checked = !_simsSettings.module_disabled;
-
-      // per-sim cards
-      const grid = document.getElementById('sims-grid');
-      const dis  = new Set(_simsSettings.disabled_ids || []);
-      // group by category
-      const byCat = {};
-      ADMIN_SIMS.forEach(s => { (byCat[s.cat] = byCat[s.cat] || []).push(s); });
-
-      let html = '';
-      Object.entries(byCat).forEach(([cat, sims]) => {
-        html += `<div style="grid-column:1/-1;font-size:.72rem;font-weight:800;text-transform:uppercase;letter-spacing:.07em;color:var(--text-3);margin-top:12px;margin-bottom:2px">${esc(cat)}</div>`;
-        sims.forEach(s => {
-          const enabled = !dis.has(s.id);
-          html += `<div class="perm-card${enabled ? ' enabled' : ''}" id="simcard-${s.id}">
-            <div class="perm-info">
-              <div class="perm-label">${esc(s.title)}</div>
-              <div class="perm-desc" style="font-size:11px;margin-top:2px;opacity:.7">${esc(s.id)}</div>
-            </div>
-            <label class="perm-toggle" title="${enabled ? 'Отключить' : 'Включить'}">
-              <input type="checkbox" ${enabled ? 'checked' : ''} onchange="simToggleOne('${s.id}', this.checked)" />
-              <span class="perm-track"></span>
-              <span class="perm-thumb"></span>
-            </label>
-          </div>`;
-        });
-      });
-      grid.innerHTML = html;
-      if (window.lucide) lucide.createIcons();
-    }
-
-    async function simsMasterToggle(checked) {
-      // checked = module enabled; disabled = !checked
-      try {
-        await LS.api('/api/settings/sims', { method: 'PUT', body: JSON.stringify({ module_disabled: !checked }) });
-        _simsSettings.module_disabled = !checked;
-        LS.toast(checked ? 'Модуль симуляций включён' : 'Модуль симуляций отключён', checked ? 'success' : 'warning');
-      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-    }
-
-    async function simToggleOne(simId, enabled) {
-      const dis = new Set(_simsSettings.disabled_ids || []);
-      if (enabled) dis.delete(simId); else dis.add(simId);
-      const disabled_ids = [...dis];
-      try {
-        await LS.api('/api/settings/sims', { method: 'PUT', body: JSON.stringify({ disabled_ids }) });
-        _simsSettings.disabled_ids = disabled_ids;
-        // update card style
-        const card = document.getElementById('simcard-' + simId);
-        if (card) card.classList.toggle('enabled', enabled);
-        LS.toast(enabled ? `«${simId}» включена` : `«${simId}» отключена`, enabled ? 'success' : 'warning');
-      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-    }
-
-    /* ─── Games features admin ─── */
-    const GAME_FEATURES = [
-      { key: 'hangman',       label: 'Виселица',        desc: 'Игра «Угадай слово» — отгадывание терминов по буквам',              icon: 'gamepad-2'      },
-      { key: 'crossword',     label: 'Кроссворд',       desc: 'Кроссворд из терминов — генерируется автоматически по темам',       icon: 'grid-3x3'       },
-      { key: 'pet',           label: 'Питомец',          desc: 'Виртуальный питомец, отражающий активность ученика',                icon: 'heart'          },
-      { key: 'red_book',      label: 'Красная книга',   desc: 'Интерактивная Красная книга РБ: виды, биомы, пищевые сети, квесты', icon: 'leaf'           },
-      { key: 'collection',    label: 'Коллекция',        desc: 'Коллекция карточек и достижений — игровой прогресс ученика',        icon: 'layers'         },
-      { key: 'flashcards',    label: 'Флеш-карточки',   desc: 'Карточки для запоминания терминов и понятий методом интервальных повторений', icon: 'square-stack'   },
-      { key: 'knowledge_map', label: 'Карта знаний',    desc: 'Визуальная карта тем и связей между биологическими понятиями',      icon: 'share-2'        },
-      { key: 'board',         label: 'Доска',             desc: 'Классная доска с объявлениями, постами и обсуждениями',             icon: 'layout-dashboard'},
-      { key: 'biochem',       label: 'Биохимия',          desc: 'Молекулярный редактор, задачи на построение молекул и реакции',     icon: 'flask-conical'  },
-      { key: 'live_quiz',     label: 'Живая викторина',  desc: 'Синхронная викторина в реальном времени для всего класса',          icon: 'radio'          },
-    ];
-
-    async function loadGamesAdmin() {
-      const grid = document.getElementById('games-features-grid');
-      try {
-        const features = await LS.api('/api/admin/features');
-        grid.innerHTML = '';
-        for (const f of GAME_FEATURES) {
-          const enabled = features[f.key] !== false;
-          const card = document.createElement('div');
-          card.className = 'perm-card' + (enabled ? ' enabled' : '');
-          card.innerHTML = `
-            <div class="perm-info">
-              <div class="perm-label"><i data-lucide="${f.icon}" style="width:14px;height:14px;vertical-align:-2px;margin-right:6px"></i>${f.label}</div>
-              <div class="perm-desc">${f.desc}</div>
-            </div>
-            <label class="perm-toggle">
-              <input type="checkbox" ${enabled ? 'checked' : ''} onchange="toggleGameFeature('${f.key}', this.checked, this)" />
-              <span class="perm-track"></span>
-              <span class="perm-thumb"></span>
-            </label>`;
-          grid.appendChild(card);
-        }
-        if (window.lucide) lucide.createIcons();
-      } catch(e) {
-        grid.innerHTML = '<div class="error">Ошибка загрузки</div>';
-      }
-    }
-
-    async function toggleGameFeature(key, enabled, checkbox) {
-      try {
-        await LS.api('/api/admin/features', {
-          method: 'PATCH',
-          body: JSON.stringify({ [key]: enabled }),
-        });
-        const card = checkbox.closest('.perm-card');
-        if (card) card.classList.toggle('enabled', enabled);
-        LS.toast(enabled ? 'Функция включена' : 'Функция отключена', 'success');
-      } catch(e) {
-        checkbox.checked = !enabled;
-        LS.toast('Ошибка: ' + e.message, 'error');
-      }
-    }
-
-    /* ─── Free-student module features ─── */
-    const FS_FEATURES = [
-      { key: 'gamification', label: 'Геймификация',   desc: 'XP, уровни, достижения, монеты, стрики, магазин', icon: 'trophy' },
-      { key: 'hangman',      label: 'Виселица',        desc: 'Игра «Угадай слово» — отгадывание терминов по буквам', icon: 'gamepad-2' },
-      { key: 'crossword',    label: 'Кроссворд',       desc: 'Кроссворд из терминов — генерируется автоматически', icon: 'grid-3x3' },
-      { key: 'pet',          label: 'Питомец',          desc: 'Виртуальный питомец, отражающий активность ученика', icon: 'heart' },
-      { key: 'red_book',     label: 'Красная книга',   desc: 'Интерактивная Красная книга РБ: виды, биомы, квесты', icon: 'leaf' },
-      { key: 'collection',   label: 'Коллекция',        desc: 'Коллекция карточек и игровой прогресс ученика', icon: 'layers' },
-      { key: 'lab',          label: 'Лаборатория',      desc: 'Виртуальные симуляции и интерактивные опыты', icon: 'flask-conical' },
-      { key: 'knowledge_map',label: 'Карта знаний',    desc: 'Визуальная карта тем и связей между понятиями', icon: 'map' },
-      { key: 'flashcards',   label: 'Флеш-карточки',   desc: 'Карточки для повторения терминов и понятий', icon: 'square-stack' },
-      { key: 'board',        label: 'Доска',             desc: 'Классная доска с объявлениями и постами', icon: 'layout-dashboard' },
-      { key: 'biochem',      label: 'Биохимия',          desc: 'Молекулярный редактор, задачи на построение молекул и реакции', icon: 'flask-conical' },
-      { key: 'live_quiz',    label: 'Живая викторина',  desc: 'Синхронная викторина в реальном времени для всего класса', icon: 'radio' },
-    ];
-
-    async function loadFsFeatures() {
-      const grid = document.getElementById('fs-features-grid');
-      try {
-        const features = await LS.api('/api/admin/free-student-features');
-        grid.innerHTML = '';
-        for (const f of FS_FEATURES) {
-          const enabled = features[f.key] !== false;
-          const card = document.createElement('div');
-          card.className = 'perm-card' + (enabled ? ' enabled' : '');
-          card.innerHTML = `
-            <div class="perm-info">
-              <div class="perm-label"><i data-lucide="${f.icon}" style="width:14px;height:14px;vertical-align:-2px;margin-right:6px"></i>${f.label}</div>
-              <div class="perm-desc">${f.desc}</div>
-            </div>
-            <label class="perm-toggle">
-              <input type="checkbox" ${enabled ? 'checked' : ''} onchange="toggleFsFeature('${f.key}', this.checked, this)" />
-              <span class="perm-track"></span>
-              <span class="perm-thumb"></span>
-            </label>`;
-          grid.appendChild(card);
-        }
-        if (window.lucide) lucide.createIcons();
-      } catch(e) {
-        grid.innerHTML = '<div class="error">Ошибка загрузки</div>';
-      }
-    }
-
-    async function toggleFsFeature(key, enabled, checkbox) {
-      try {
-        await LS.api('/api/admin/free-student-features', {
-          method: 'PATCH',
-          body: JSON.stringify({ [key]: enabled }),
-        });
-        const card = checkbox.closest('.perm-card');
-        if (card) card.classList.toggle('enabled', enabled);
-        LS.toast(enabled ? 'Модуль включён' : 'Модуль отключён', 'success');
-      } catch(e) {
-        checkbox.checked = !enabled;
-        LS.toast('Ошибка: ' + e.message, 'error');
-      }
-    }
-
-    /* ─── Submission log ─── */
-    const SL_STATUSES = { new:'На проверке', reviewed:'Проверено', accepted:'Принято', revision:'На доработке', resubmitted:'Повторно' };
-
-    async function loadSubmissionLog() {
-      const el = document.getElementById('sublog-list');
-      const countEl = document.getElementById('sublog-count');
-      const classId = document.getElementById('sublog-class-filter').value;
-      el.innerHTML = '<div class="spinner"></div>';
-      countEl.textContent = '';
-      try {
-        const url = classId ? `/api/submissions/log?class_id=${classId}` : '/api/submissions/log';
-        const rows = await LS.api(url);
-
-        // Populate class filter on first load
-        const sel = document.getElementById('sublog-class-filter');
-        if (sel.options.length <= 1 && rows.length) {
-          const classMap = new Map();
-          rows.forEach(r => { if (r.class_id && r.class_name) classMap.set(r.class_id, r.class_name); });
-          classMap.forEach((name, id) => {
-            const opt = document.createElement('option');
-            opt.value = id; opt.textContent = name;
-            sel.appendChild(opt);
-          });
-        }
-
-        countEl.textContent = rows.length ? `${rows.length} записей` : '';
-
-        if (!rows.length) {
-          el.innerHTML = `<div class="sl-empty">
-            <div class="sl-empty-icon"><i data-lucide="inbox" style="width:48px;height:48px"></i></div>
-            Удалённых работ нет
-          </div>`;
-          if (window.lucide) lucide.createIcons({ nodes: [el] });
-          return;
-        }
-
-        const ROLE_LABELS = { admin: 'Админ', teacher: 'Учитель', student: 'Ученик' };
-
-        el.innerHTML = `<div class="sl-wrap"><table class="sl-table">
-          <thead><tr>
-            <th>Дата</th>
-            <th>Ученик</th>
-            <th>Файл</th>
-            <th>Задание</th>
-            <th>Класс</th>
-            <th>Статус</th>
-            <th>Оценка</th>
-            <th>Удалил</th>
-          </tr></thead>
-          <tbody>${rows.map(r => {
-            const dt = r.deleted_at ? new Date(r.deleted_at.includes('T') ? r.deleted_at : r.deleted_at.replace(' ','T')+'Z') : null;
-            const dateStr = dt ? dt.toLocaleDateString('ru',{day:'numeric',month:'short'}) + ' ' + dt.toLocaleTimeString('ru',{hour:'2-digit',minute:'2-digit'}) : '—';
-            const initials = (r.student_name || '?').split(' ').slice(0,2).map(w => w[0]?.toUpperCase() || '').join('');
-            const st = r.status || 'new';
-            const gradeVal = r.grade != null ? r.grade : null;
-            const gradeCls = gradeVal != null ? (gradeVal >= 80 ? 'sl-grade-hi' : gradeVal >= 50 ? 'sl-grade-mid' : 'sl-grade-lo') : 'sl-grade-none';
-            const roleCls = 'sl-role-' + (r.deleted_by_role || 'student');
-            return `<tr>
-              <td><span class="sl-date">${dateStr}</span></td>
-              <td><span class="sl-student"><span class="sl-student-avatar">${initials}</span>${esc(r.student_name || '—')}</span></td>
-              <td><span class="sl-file" title="${esc(r.original_name || '')}">${esc(r.original_name || '—')}</span></td>
-              <td><span class="sl-assignment">${esc(r.assignment_title || '—')}</span></td>
-              <td><span class="sl-class">${esc(r.class_name || '—')}</span></td>
-              <td><span class="sl-status sl-status-${st}">${SL_STATUSES[st] || st}</span></td>
-              <td><span class="sl-grade ${gradeCls}">${gradeVal != null ? gradeVal : '—'}</span></td>
-              <td><span class="sl-deleted-by">${esc(r.deleted_by_name || '—')} <span class="sl-role-badge ${roleCls}">${ROLE_LABELS[r.deleted_by_role] || r.deleted_by_role || '?'}</span></span></td>
-            </tr>`;
-          }).join('')}</tbody>
-        </table></div>`;
-        document.getElementById('btn-clear-sublog').style.display = '';
-      } catch (e) {
-        el.innerHTML = `<div class="sl-empty" style="color:#c0306a">Ошибка: ${esc(e.message)}</div>`;
-      }
-    }
-
-    async function clearSubmissionLog() {
-      if (!await LS.confirm('Очистить весь журнал удалённых работ? Это действие необратимо.', { title: 'Очистка журнала', confirmText: 'Очистить', danger: true })) return;
-      try {
-        await LS.api('/api/submissions/log', { method: 'DELETE' });
-        document.getElementById('btn-clear-sublog').style.display = 'none';
-        document.getElementById('sublog-count').textContent = '';
-        document.getElementById('sublog-list').innerHTML = `<div class="sl-empty">
-          <div class="sl-empty-icon"><i data-lucide="inbox" style="width:48px;height:48px"></i></div>
-          Журнал очищен
-        </div>`;
-        if (window.lucide) lucide.createIcons({ nodes: [document.getElementById('sublog-list')] });
-        LS.toast('Журнал очищен', 'success');
-      } catch (e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-    }
-
-    /* ═══ TOPICS ═══════════════════════════════════════════════════════ */
-    let _topicsSubjects = [];
-    async function loadTopicSubjects() {
-      if (_topicsSubjects.length) return;
-      try {
-        _topicsSubjects = await LS.getSubjects();
-        const sel = document.getElementById('topics-subj-filter');
-        sel.innerHTML = _topicsSubjects.map(s => `<option value="${s.id}">${esc(s.name)}</option>`).join('');
-      } catch {}
-    }
-    async function loadTopics() {
-      await loadTopicSubjects();
-      const subjId = document.getElementById('topics-subj-filter').value;
-      const el = document.getElementById('topics-list');
-      el.innerHTML = LS.skeleton(4, 'row');
-      try {
-        const rows = await LS.api(`/api/admin/topics?subject_id=${subjId}`);
-        document.getElementById('topics-count').textContent = rows.length + ' тем';
-        if (!rows.length) { el.innerHTML = '<div style="padding:32px;text-align:center;color:var(--text-3)">Тем нет</div>'; return; }
-        el.innerHTML = '<div style="display:flex;flex-direction:column;gap:6px">' + rows.map(t => `
-          <div class="adm-panel" style="padding:12px 18px;margin:0;display:flex;align-items:center;gap:14px">
-            <span style="font-size:0.75rem;color:var(--text-3);font-weight:700;min-width:28px">#${t.order_index}</span>
-            <span style="flex:1;font-weight:600">${esc(t.name)}</span>
-            <span style="font-size:0.78rem;color:var(--text-3)">${t.question_count} вопр.</span>
-            <button class="adm-btn adm-btn-small" style="background:var(--border-h);color:var(--text-2);padding:5px 12px" onclick="renameTopic(${t.id},'${esc(t.name).replace(/'/g,"\\'")}')">
-              <i data-lucide="pencil" style="width:12px;height:12px;vertical-align:-1px"></i>
-            </button>
-            <button class="adm-btn adm-btn-small" style="background:rgba(241,91,181,0.1);color:var(--pink);padding:5px 12px" onclick="deleteTopic(${t.id},'${esc(t.name).replace(/'/g,"\\'")}',${t.question_count})">
-              <i data-lucide="trash-2" style="width:12px;height:12px;vertical-align:-1px"></i>
-            </button>
-          </div>`).join('') + '</div>';
-        if (window.lucide) lucide.createIcons({ nodes: [el] });
-      } catch (e) { el.innerHTML = `<div style="color:var(--pink)">${esc(e.message)}</div>`; }
-    }
-    function showAddTopic() { document.getElementById('topics-add-row').style.display = ''; document.getElementById('topics-new-name').focus(); }
-    async function createTopic() {
-      const name = document.getElementById('topics-new-name').value.trim();
-      if (!name) return;
-      const subjId = document.getElementById('topics-subj-filter').value;
-      try {
-        await LS.api('/api/admin/topics', { method:'POST', body: JSON.stringify({ subject_id: subjId, name }) });
-        document.getElementById('topics-new-name').value = '';
-        document.getElementById('topics-add-row').style.display = 'none';
-        LS.toast('Тема создана', 'success');
-        loadTopics();
-      } catch (e) { LS.toast(e.message, 'error'); }
-    }
-    async function renameTopic(id, oldName) {
-      const name = prompt('Новое название темы:', oldName);
-      if (!name || name === oldName) return;
-      try {
-        await LS.api(`/api/admin/topics/${id}`, { method:'PATCH', body: JSON.stringify({ name }) });
-        LS.toast('Тема переименована', 'success');
-        loadTopics();
-      } catch (e) { LS.toast(e.message, 'error'); }
-    }
-    async function deleteTopic(id, name, qcount) {
-      if (qcount > 0) { LS.toast(`Нельзя удалить тему с ${qcount} вопросами`, 'warn'); return; }
-      if (!await LS.confirm(`Удалить тему "${name}"?`, { danger: true })) return;
-      try {
-        await LS.api(`/api/admin/topics/${id}`, { method:'DELETE' });
-        LS.toast('Тема удалена', 'success');
-        loadTopics();
-      } catch (e) { LS.toast(e.message, 'error'); }
-    }
-
-    /* ═══ BROADCAST ═════════════════════════════════════════════════════ */
-    async function sendBroadcast() {
-      const message = document.getElementById('bc-message').value.trim();
-      if (!message) { LS.toast('Введите сообщение', 'warn'); return; }
-      const role = document.getElementById('bc-role').value;
-      const link = document.getElementById('bc-link').value.trim() || null;
-      try {
-        const r = await LS.api('/api/admin/broadcast', { method:'POST', body: JSON.stringify({ message, role, link }) });
-        document.getElementById('bc-result').textContent = `Отправлено ${r.sent} пользователям`;
-        document.getElementById('bc-message').value = '';
-        LS.toast(`Уведомление отправлено ${r.sent} пользователям`, 'success');
-      } catch (e) { LS.toast(e.message, 'error'); }
-    }
-
-    /* ═══ AUDIT LOG ════════════════════════════════════════════════════ */
-    async function loadAuditLog() {
-      const el = document.getElementById('audit-list');
-      el.innerHTML = LS.skeleton(5, 'row');
-      try {
-        const rows = await LS.api('/api/admin/audit-log?limit=200');
-        if (!rows.length) { el.innerHTML = '<div style="padding:32px;text-align:center;color:var(--text-3)">Журнал пуст</div>'; return; }
-        const ACTION_LABELS = {
-          'user.role_change': 'Смена роли', 'user.edit': 'Редактирование', 'user.ban': 'Блокировка',
-          'user.unban': 'Разблокировка', 'user.delete': 'Удаление', 'user.clear_sessions': 'Очистка истории',
-          'features.update': 'Фичи обновлены', 'topic.create': 'Создание темы', 'topic.update': 'Редакт. темы',
-          'topic.delete': 'Удаление темы', 'broadcast': 'Рассылка',
-        };
-        const ACTION_COLORS = {
-          'user.delete': 'var(--pink)', 'user.ban': 'var(--pink)', 'user.clear_sessions': 'var(--amber)',
-        };
-        el.innerHTML = `<div class="sl-wrap"><table class="sl-table">
-          <thead><tr><th>Дата</th><th>Админ</th><th>Действие</th><th>Цель</th><th>Детали</th><th>IP</th></tr></thead>
-          <tbody>${rows.map(r => {
-            const dt = new Date(r.created_at);
-            const ds = dt.toLocaleDateString('ru',{day:'numeric',month:'short'}) + ' ' + dt.toLocaleTimeString('ru',{hour:'2-digit',minute:'2-digit'});
-            const acol = ACTION_COLORS[r.action] || 'var(--violet)';
-            return `<tr>
-              <td><span class="sl-date">${ds}</span></td>
-              <td>${esc(r.admin_name || '—')}</td>
-              <td><span style="color:${acol};font-weight:700;font-size:0.82rem">${ACTION_LABELS[r.action] || r.action}</span></td>
-              <td style="font-size:0.82rem;color:var(--text-3)">${esc(r.target || '')}</td>
-              <td style="font-size:0.82rem;max-width:300px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap" title="${esc(r.detail || '')}">${esc(r.detail || '')}</td>
-              <td style="font-size:0.78rem;color:var(--text-3);font-family:monospace">${esc(r.ip || '')}</td>
-            </tr>`;
-          }).join('')}</tbody></table></div>`;
-      } catch (e) { el.innerHTML = `<div style="color:var(--pink)">${esc(e.message)}</div>`; }
-    }
-    async function clearAuditLog() {
-      if (!await LS.confirm('Очистить весь аудит-лог?', { danger: true })) return;
-      try {
-        await LS.api('/api/admin/audit-log', { method:'DELETE' });
-        document.getElementById('audit-list').innerHTML = '<div style="padding:32px;text-align:center;color:var(--text-3)">Журнал очищен</div>';
-        LS.toast('Журнал очищен', 'success');
-      } catch (e) { LS.toast(e.message, 'error'); }
-    }
-
-    /* ═══ ERROR LOG ════════════════════════════════════════════════════ */
-    async function loadErrorLog() {
-      const el = document.getElementById('errors-list');
-      el.innerHTML = LS.skeleton(3, 'row');
-      try {
-        const rows = await LS.api('/api/admin/error-log?limit=200');
-        if (!rows.length) { el.innerHTML = '<div style="padding:32px;text-align:center;color:var(--text-3);font-size:0.88rem">Ошибок нет</div>'; return; }
-        el.innerHTML = rows.map(r => {
-          const dt = new Date(r.created_at);
-          const ds = dt.toLocaleDateString('ru',{day:'numeric',month:'short'}) + ' ' + dt.toLocaleTimeString('ru',{hour:'2-digit',minute:'2-digit'});
-          return `<div class="adm-panel" style="padding:14px 18px;margin-bottom:8px;border-left:3px solid var(--pink)">
-            <div style="display:flex;align-items:center;gap:10px;margin-bottom:6px">
-              <span style="font-size:0.78rem;color:var(--pink);font-weight:700">${r.method || ''} ${esc(r.route || '')}</span>
-              <span style="font-size:0.72rem;color:var(--text-3);margin-left:auto">${ds}</span>
-              ${r.user_id ? `<span style="font-size:0.72rem;color:var(--text-3)">user:${r.user_id}</span>` : ''}
-            </div>
-            <div style="font-size:0.88rem;font-weight:600;color:var(--text);margin-bottom:4px">${esc(r.message)}</div>
-            ${r.stack ? `<details><summary style="font-size:0.75rem;color:var(--text-3);cursor:pointer">Stack trace</summary><pre style="font-size:0.72rem;color:var(--text-3);white-space:pre-wrap;max-height:200px;overflow:auto;margin-top:6px;padding:8px;background:rgba(0,0,0,0.02);border-radius:8px">${esc(r.stack)}</pre></details>` : ''}
-          </div>`;
-        }).join('');
-      } catch (e) { el.innerHTML = `<div style="color:var(--pink)">${esc(e.message)}</div>`; }
-    }
-    async function clearErrorLog() {
-      if (!await LS.confirm('Очистить журнал ошибок?', { danger: true })) return;
-      try {
-        await LS.api('/api/admin/error-log', { method:'DELETE' });
-        document.getElementById('errors-list').innerHTML = '<div style="padding:32px;text-align:center;color:var(--text-3)">Журнал очищен</div>';
-        LS.toast('Журнал очищен', 'success');
-      } catch (e) { LS.toast(e.message, 'error'); }
-    }
-
-    /* ═══ SYSTEM HEALTH ════════════════════════════════════════════════ */
-    async function loadHealth() {
-      const el = document.getElementById('health-content');
-      el.innerHTML = LS.skeleton(3, 'row');
-      try {
-        const h = await LS.api('/api/admin/health');
-        const fmtBytes = b => b > 1e9 ? (b/1e9).toFixed(1)+' GB' : b > 1e6 ? (b/1e6).toFixed(1)+' MB' : (b/1e3).toFixed(0)+' KB';
-        const fmtUp = s => { const d=Math.floor(s/86400), hr=Math.floor(s%86400/3600), m=Math.floor(s%3600/60); return d>0?`${d}d ${hr}h`:hr>0?`${hr}h ${m}m`:`${m}m`; };
-        el.innerHTML = `
-          <div style="display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px;margin-bottom:24px">
-            <div class="adm-panel" style="padding:18px;margin:0;text-align:center">
-              <div style="font-size:1.3rem;font-weight:800;font-family:'Unbounded',sans-serif;color:var(--green)">${fmtUp(h.uptime)}</div>
-              <div style="font-size:0.72rem;color:var(--text-3);font-weight:700;text-transform:uppercase;margin-top:4px">Uptime</div>
-            </div>
-            <div class="adm-panel" style="padding:18px;margin:0;text-align:center">
-              <div style="font-size:1.3rem;font-weight:800;font-family:'Unbounded',sans-serif;color:var(--violet)">${fmtBytes(h.db.sizeBytes)}</div>
-              <div style="font-size:0.72rem;color:var(--text-3);font-weight:700;text-transform:uppercase;margin-top:4px">База данных</div>
-            </div>
-            <div class="adm-panel" style="padding:18px;margin:0;text-align:center">
-              <div style="font-size:1.3rem;font-weight:800;font-family:'Unbounded',sans-serif">${fmtBytes(h.uploads.sizeBytes)}</div>
-              <div style="font-size:0.72rem;color:var(--text-3);font-weight:700;text-transform:uppercase;margin-top:4px">Файлы</div>
-            </div>
-            <div class="adm-panel" style="padding:18px;margin:0;text-align:center">
-              <div style="font-size:1.3rem;font-weight:800;font-family:'Unbounded',sans-serif;color:${h.recentErrors>0?'var(--pink)':'var(--green)'}">${h.recentErrors}</div>
-              <div style="font-size:0.72rem;color:var(--text-3);font-weight:700;text-transform:uppercase;margin-top:4px">Ошибок за 24ч</div>
-            </div>
-          </div>
-          <div style="display:grid;grid-template-columns:1fr 1fr;gap:14px">
-            <div class="adm-panel" style="margin:0">
-              <div class="adm-panel-title">Платформа</div>
-              <table style="width:100%;font-size:0.88rem">
-                <tr><td style="color:var(--text-3);padding:4px 0">Node.js</td><td style="font-weight:600">${h.node}</td></tr>
-                <tr><td style="color:var(--text-3);padding:4px 0">OS</td><td style="font-weight:600">${h.platform}</td></tr>
-                <tr><td style="color:var(--text-3);padding:4px 0">CPU ядра</td><td style="font-weight:600">${h.cpus}</td></tr>
-                <tr><td style="color:var(--text-3);padding:4px 0">RAM использовано</td><td style="font-weight:600">${fmtBytes(h.memory.rss)}</td></tr>
-                <tr><td style="color:var(--text-3);padding:4px 0">RAM heap</td><td style="font-weight:600">${fmtBytes(h.memory.heapUsed)}</td></tr>
-                <tr><td style="color:var(--text-3);padding:4px 0">RAM свободно</td><td style="font-weight:600">${fmtBytes(h.freeMem)} / ${fmtBytes(h.totalMem)}</td></tr>
-              </table>
-            </div>
-            <div class="adm-panel" style="margin:0">
-              <div class="adm-panel-title">Данные</div>
-              <table style="width:100%;font-size:0.88rem">
-                <tr><td style="color:var(--text-3);padding:4px 0">Пользователей</td><td style="font-weight:600">${h.db.totalUsers}</td></tr>
-                <tr><td style="color:var(--text-3);padding:4px 0">Всего сессий</td><td style="font-weight:600">${h.db.totalSessions}</td></tr>
-                <tr><td style="color:var(--text-3);padding:4px 0">Сессий сегодня</td><td style="font-weight:600;color:var(--violet)">${h.db.todaySessions}</td></tr>
-                <tr><td style="color:var(--text-3);padding:4px 0">Вопросов в базе</td><td style="font-weight:600">${h.db.totalQuestions}</td></tr>
-              </table>
-            </div>
-          </div>`;
-      } catch (e) { el.innerHTML = `<div style="color:var(--pink)">${esc(e.message)}</div>`; }
-    }
-
-    /* ════════════════════════════════════════════════
-       ОНЛАЙН-УРОКИ (classroom admin)
-    ════════════════════════════════════════════════ */
-    let _crHistPage = 1, _crHistTotal = 0, _crHistPages = 0, _crHistSearch = '';
-    let _crOpenDetailId = null, _crHistDebTimer = null;
-
-    async function loadCrModuleState() {
-      try {
-        const features = await LS.api('/api/admin/features');
-        const chk = document.getElementById('cr-master-chk');
-        if (chk) chk.checked = features.classroom !== false;
-      } catch(e) { /* silent */ }
-    }
-
-    async function crMasterToggle(enabled) {
-      try {
-        await LS.api('/api/admin/features', { method: 'PATCH', body: JSON.stringify({ classroom: enabled }) });
-        LS.toast(enabled ? 'Модуль онлайн-уроков включён' : 'Модуль онлайн-уроков отключён', enabled ? 'success' : 'warning', 3000);
-      } catch(e) {
-        LS.toast('Ошибка: ' + e.message, 'error');
-        // revert checkbox
-        const chk = document.getElementById('cr-master-chk');
-        if (chk) chk.checked = !enabled;
-      }
-    }
-
-    function fmtDuration(sec) {
-      if (!sec || sec < 0) return '—';
-      const h = Math.floor(sec / 3600), m = Math.floor((sec % 3600) / 60), s = sec % 60;
-      if (h) return `${h}ч ${m}м`;
-      if (m) return `${m} мин ${s} сек`;
-      return `${s} сек`;
-    }
-    function fmtLiveDuration(createdAt) {
-      const sec = Math.round((Date.now() - new Date(createdAt).getTime()) / 1000);
-      return fmtDuration(sec);
-    }
-
-    async function loadCrActiveSessions() {
-      const el = document.getElementById('cr-live-list');
-      try {
-        const { sessions } = await LS.api('/api/classroom/admin/active');
-        if (!sessions.length) {
-          el.innerHTML = '<div class="empty">Нет активных уроков</div>';
-          return;
-        }
-        el.innerHTML = sessions.map(s => {
-          const dur = fmtLiveDuration(s.created_at);
-          const title = s.title || `Урок #${s.id}`;
-          const cls   = s.class_name ? `Класс: ${esc(s.class_name)}` : 'Личный урок';
-          return `<div class="cr-live-card">
-            <div class="cr-live-pulse"></div>
-            <div class="cr-live-info">
-              <div class="cr-live-title">${esc(title)}</div>
-              <div class="cr-live-meta">${esc(s.teacher_name)} · ${cls}</div>
-            </div>
-            <div class="cr-live-badges">
-              <span class="cr-badge cr-badge-online">
-                <svg class="ic" viewBox="0 0 24 24" style="width:11px;height:11px"><path d="M17 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2"/><circle cx="9" cy="7" r="4"/><path d="M23 21v-2a4 4 0 0 0-3-3.87"/><path d="M16 3.13a4 4 0 0 1 0 7.75"/></svg>
-                ${s.online_count}
-              </span>
-              <span class="cr-badge cr-badge-msgs">
-                <svg class="ic" viewBox="0 0 24 24" style="width:11px;height:11px"><path d="M21 15a2 2 0 0 1-2 2H7l-4 4V5a2 2 0 0 1 2-2h14a2 2 0 0 1 2 2z"/></svg>
-                ${s.message_count}
-              </span>
-              <span class="cr-badge cr-badge-dur">
-                <svg class="ic" viewBox="0 0 24 24" style="width:11px;height:11px"><circle cx="12" cy="12" r="10"/><polyline points="12 6 12 12 16 14"/></svg>
-                ${dur}
-              </span>
-            </div>
-            <div class="cr-live-actions">
-              <button class="btn-cr-end" onclick="adminEndSession(${s.id})">Завершить</button>
-            </div>
-          </div>`;
-        }).join('');
-      } catch(e) {
-        el.innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
-      }
-      if (window.lucide) lucide.createIcons();
-    }
-
-    async function adminEndSession(id) {
-      if (!await LS.confirm(`Завершить урок #${id}? Все участники будут отключены.`, { title: 'Завершить урок', confirmText: 'Завершить' })) return;
-      try {
-        await LS.api(`/api/classroom/${id}`, { method: 'DELETE' });
-        LS.toast('Урок завершён', 'success', 2500);
-        loadCrActiveSessions();
-      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-    }
-
-    function crHistDebounce() {
-      clearTimeout(_crHistDebTimer);
-      _crHistDebTimer = setTimeout(() => { _crHistPage = 1; loadCrHistory(); }, 350);
-    }
-
-    async function loadCrHistory(page) {
-      if (page) _crHistPage = page;
-      _crHistSearch = (document.getElementById('cr-hist-q')?.value || '').trim();
-      const el = document.getElementById('cr-hist-list');
-      el.innerHTML = '<div class="spinner"></div>';
-      try {
-        const params = new URLSearchParams({ page: _crHistPage, limit: 20 });
-        if (_crHistSearch) params.set('search', _crHistSearch);
-        const { sessions, total, pages } = await LS.api('/api/classroom/admin/sessions?' + params);
-        _crHistTotal = total; _crHistPages = pages;
-        document.getElementById('cr-hist-count').textContent = `${total} уроков`;
-        if (!sessions.length) {
-          el.innerHTML = '<div class="empty">Нет завершённых уроков</div>';
-          renderCrPagination();
-          return;
-        }
-        el.innerHTML = sessions.map(s => {
-          const title = s.title || `Урок #${s.id}`;
-          const cls   = s.class_name ? `Класс: ${esc(s.class_name)}` : 'Личный урок';
-          const dur   = fmtDuration(s.ended_at ? Math.round((new Date(s.ended_at)-new Date(s.created_at))/1000) : null);
-          return `<div>
-            <div class="cr-hist-row${_crOpenDetailId===s.id?' open':''}" onclick="toggleCrDetail(${s.id},this)">
-              <div class="cr-hist-icon">
-                <svg class="ic" viewBox="0 0 24 24" style="width:18px;height:18px;color:var(--violet)"><rect x="2" y="3" width="20" height="14" rx="2" ry="2"/><line x1="8" y1="21" x2="16" y2="21"/><line x1="12" y1="17" x2="12" y2="21"/></svg>
-              </div>
-              <div class="cr-hist-main">
-                <div class="cr-hist-title">${esc(title)}</div>
-                <div class="cr-hist-meta">${esc(s.teacher_name)} · ${cls} · ${fmtDate(s.ended_at || s.created_at)}</div>
-              </div>
-              <div class="cr-hist-chips">
-                <span class="cr-badge cr-badge-online">${s.participant_count} уч.</span>
-                <span class="cr-badge cr-badge-msgs">${s.message_count} сообщ.</span>
-                <span class="cr-badge cr-badge-dur">${dur}</span>
-              </div>
-              <svg class="cr-hist-chevron ic" viewBox="0 0 24 24"><polyline points="6 9 12 15 18 9"/></svg>
-            </div>
-            <div class="cr-detail-drawer${_crOpenDetailId===s.id?' open':''}" id="cr-detail-${s.id}">
-              <div class="cr-detail-inner" id="cr-detail-inner-${s.id}">
-                <div class="spinner"></div>
-              </div>
-            </div>
-          </div>`;
-        }).join('');
-        if (_crOpenDetailId) {
-          const dr = document.getElementById(`cr-detail-${_crOpenDetailId}`);
-          if (dr) loadCrSessionDetail(_crOpenDetailId);
-        }
-        renderCrPagination();
-      } catch(e) {
-        el.innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
-      }
-      if (window.lucide) lucide.createIcons();
-    }
-
-    function renderCrPagination() {
-      const el = document.getElementById('cr-hist-pagination');
-      if (_crHistPages <= 1) { el.innerHTML = ''; return; }
-      const p = _crHistPage, total = _crHistPages;
-      let html = '<div class="cr-pagination">';
-      html += `<button class="cr-page-btn" onclick="loadCrHistory(${p-1})" ${p<=1?'disabled':''}>
-        <svg class="ic" viewBox="0 0 24 24" style="width:14px;height:14px"><polyline points="15 18 9 12 15 6"/></svg>
-      </button>`;
-      const range = [];
-      for (let i=1;i<=total;i++) {
-        if (i===1||i===total||Math.abs(i-p)<=1) range.push(i);
-        else if (range[range.length-1]!=='…') range.push('…');
-      }
-      range.forEach(r => {
-        if (r==='…') html += `<span class="cr-page-info">…</span>`;
-        else html += `<button class="cr-page-btn${r===p?' active':''}" onclick="loadCrHistory(${r})">${r}</button>`;
-      });
-      html += `<button class="cr-page-btn" onclick="loadCrHistory(${p+1})" ${p>=total?'disabled':''}>
-        <svg class="ic" viewBox="0 0 24 24" style="width:14px;height:14px"><polyline points="9 18 15 12 9 6"/></svg>
-      </button></div>`;
-      el.innerHTML = html;
-    }
-
-    async function toggleCrDetail(id, rowEl) {
-      const wasOpen = _crOpenDetailId === id;
-      // close all
-      document.querySelectorAll('.cr-hist-row.open').forEach(r => r.classList.remove('open'));
-      document.querySelectorAll('.cr-detail-drawer.open').forEach(d => { d.classList.remove('open'); d.style.maxHeight=''; });
-      _crOpenDetailId = null;
-      if (wasOpen) return;
-      // open this one
-      rowEl.classList.add('open');
-      const dr = document.getElementById(`cr-detail-${id}`);
-      if (dr) { dr.classList.add('open'); }
-      _crOpenDetailId = id;
-      await loadCrSessionDetail(id);
-    }
-
-    async function loadCrSessionDetail(id) {
-      const inner = document.getElementById(`cr-detail-inner-${id}`);
-      if (!inner) return;
-      inner.innerHTML = '<div class="spinner"></div>';
-      try {
-        const { session, stats, attendance, pages } = await LS.api(`/api/classroom/${id}/summary`);
-        const dur = fmtDuration(stats.duration_sec);
-        inner.innerHTML = `
-          <div class="cr-detail-grid">
-            <div class="cr-detail-stat"><div class="cr-detail-val">${stats.participant_count}</div><div class="cr-detail-label">Участников</div></div>
-            <div class="cr-detail-stat"><div class="cr-detail-val">${stats.message_count}</div><div class="cr-detail-label">Сообщений</div></div>
-            <div class="cr-detail-stat"><div class="cr-detail-val">${stats.page_count}</div><div class="cr-detail-label">Страниц</div></div>
-            <div class="cr-detail-stat"><div class="cr-detail-val" style="font-size:1rem">${dur}</div><div class="cr-detail-label">Длительность</div></div>
-          </div>
-          ${attendance.length ? `
-            <div class="section-title" style="font-size:0.72rem;margin-bottom:8px">Посещаемость</div>
-            <div class="cr-attend-list">
-              ${attendance.map(a => `
-                <div class="cr-attend-row">
-                  <svg class="ic" viewBox="0 0 24 24" style="width:15px;height:15px;flex-shrink:0;color:var(--violet)"><path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2"/><circle cx="12" cy="7" r="4"/></svg>
-                  <span class="cr-attend-name">${esc(a.user_name)}</span>
-                  <span class="cr-attend-time">${a.joined_at ? new Date(a.joined_at).toLocaleTimeString('ru-RU',{hour:'2-digit',minute:'2-digit'}) : '—'}</span>
-                  <span class="cr-attend-dur">${a.duration_sec ? fmtDuration(a.duration_sec) : (a.left_at ? '—' : '<span style="color:var(--green)">онлайн</span>')}</span>
-                </div>
-              `).join('')}
-            </div>
-          ` : ''}
-          ${pages.length > 1 ? `
-            <div class="section-title" style="font-size:0.72rem;margin:16px 0 8px">Страницы доски</div>
-            <div class="cr-pages-list">
-              ${pages.map(p => `
-                <div class="cr-page-chip">
-                  <span class="cr-page-num">Стр. ${p.page_num}</span>
-                  <span class="cr-page-cnt">${p.stroke_count} штр.</span>
-                </div>
-              `).join('')}
-            </div>
-          ` : ''}
-          <div class="cr-detail-actions">
-            <button class="btn-cr-export" onclick="adminExportChat(${id})">
-              <svg class="ic" viewBox="0 0 24 24" style="width:13px;height:13px;vertical-align:-2px"><path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/><polyline points="7 10 12 15 17 10"/><line x1="12" y1="15" x2="12" y2="3"/></svg>
-              Экспорт чата
-            </button>
-            <button class="btn-cr-del" onclick="adminDeleteSession(${id})">
-              <svg class="ic" viewBox="0 0 24 24" style="width:13px;height:13px;vertical-align:-2px"><polyline points="3 6 5 6 21 6"/><path d="M19 6l-1 14a2 2 0 0 1-2 2H8a2 2 0 0 1-2-2L5 6"/><path d="M10 11v6"/><path d="M14 11v6"/></svg>
-              Удалить запись
-            </button>
-          </div>`;
-      } catch(e) {
-        inner.innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
-      }
-    }
-
-    function adminExportChat(id) {
-      window.open(`/api/classroom/${id}/chat/export`, '_blank');
-    }
-
-    async function adminDeleteSession(id) {
-      if (!await LS.confirm('Удалить всю запись об этом уроке? Данные нельзя восстановить.', { title: 'Удалить урок', confirmText: 'Удалить', dangerous: true })) return;
-      try {
-        await LS.api(`/api/classroom/${id}/history`, { method: 'DELETE' });
-        LS.toast('Урок удалён', 'success', 2500);
-        _crOpenDetailId = null;
-        loadCrHistory();
-      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
-    }
-
-    /* ─── wire tab loading ─── */
-    const _origSwitchTab = window.switchTab;
-    window.switchTab = function(btn) {
-      _origSwitchTab(btn);
-      const tab = btn.dataset.tab;
-      if (tab === 'topics') loadTopics();
-      else if (tab === 'audit') loadAuditLog();
-      else if (tab === 'errors') loadErrorLog();
-      else if (tab === 'health') loadHealth();
-      else if (tab === 'classroom') { loadCrModuleState(); loadCrActiveSessions(); loadCrHistory(); }
-      else if (tab === 'avatars')   { loadAvatarRequests(); }
-    };
-
-    /* ── Avatar moderation ─────────────────────────────────────────────── */
-    async function loadAvatarRequests() {
-      const list = document.getElementById('av-list');
-      list.innerHTML = '<div style="color:var(--muted);text-align:center;padding:40px 0;font-size:0.85rem">Загрузка...</div>';
-      try {
-        const rows = await LS.get('/api/avatar/pending');
-        const badge = document.getElementById('av-badge');
-        if (rows.length) {
-          badge.textContent = rows.length;
-          badge.style.display = 'inline-flex';
-        } else {
-          badge.style.display = 'none';
-        }
-        if (!rows.length) {
-          list.innerHTML = '<div class="av-empty"><i data-lucide="check-circle" style="width:36px;height:36px;opacity:.3;display:block;margin:0 auto 10px"></i>Нет заявок на модерацию</div>';
-          if (window.lucide) lucide.createIcons();
-          return;
-        }
-        list.innerHTML = `<div class="av-grid">${rows.map(r => {
-          const initials = (r.user_name||'LS').split(' ').slice(0,2).map(w=>(w[0]||'').toUpperCase()).join('') || 'LS';
-          const curAvatar = r.current_avatar
-            ? `<img src="/avatars/${esc(r.current_avatar)}" alt="">`
-            : initials;
-          const newAvatar = `<img src="/avatars/${esc(r.filename)}" alt="" onerror="this.parentElement.textContent='?'">`;
-          const d = new Date(r.created_at).toLocaleString('ru', { day:'numeric', month:'short', hour:'2-digit', minute:'2-digit' });
-          return `<div class="av-card" id="av-card-${r.id}">
-            <div class="av-card-top">
-              <div class="av-imgs">
-                <div class="av-img-wrap">
-                  <span>Сейчас</span>
-                  <div class="av-img">${curAvatar}</div>
-                </div>
-                <svg class="av-arrow" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" width="16" height="16"><line x1="5" y1="12" x2="19" y2="12"/><polyline points="12 5 19 12 12 19"/></svg>
-                <div class="av-img-wrap">
-                  <span>Новый</span>
-                  <div class="av-img">${newAvatar}</div>
-                </div>
-              </div>
-            </div>
-            <div>
-              <div class="av-user-name">${esc(r.user_name||r.user_email)}</div>
-              <div class="av-date">${esc(r.user_email)} · ${d}</div>
-            </div>
-            <div class="av-actions">
-              <button class="av-approve" onclick="avatarApprove(${r.id})">Одобрить</button>
-              <button class="av-reject"  onclick="avatarRejectPrompt(${r.id})">Отклонить</button>
-            </div>
-          </div>`;
-        }).join('')}</div>`;
-        if (window.lucide) lucide.createIcons();
-      } catch {
-        list.innerHTML = '<div class="av-empty">Ошибка загрузки</div>';
-      }
-    }
-
-    async function avatarApprove(id) {
-      const card = document.getElementById('av-card-' + id);
-      if (card) card.style.opacity = '0.5';
-      try {
-        await LS.post('/api/avatar/' + id + '/approve', {});
-        LS.toast('Аватар одобрен', 'success');
-        loadAvatarRequests();
-      } catch { LS.toast('Ошибка', 'error'); if (card) card.style.opacity = ''; }
-    }
-
-    function avatarRejectPrompt(id) {
-      const reason = prompt('Причина отклонения (необязательно):') ?? null;
-      if (reason === null) return; // cancelled
-      avatarReject(id, reason);
-    }
-
-    async function avatarReject(id, reason) {
-      const card = document.getElementById('av-card-' + id);
-      if (card) card.style.opacity = '0.5';
-      try {
-        await LS.patch('/api/avatar/' + id + '/reject', { reason });
-        LS.toast('Аватар отклонён', 'info');
-        loadAvatarRequests();
-      } catch { LS.toast('Ошибка', 'error'); if (card) card.style.opacity = ''; }
-    }
-
-    /* ─── init ─── */
-    loadStats();
-    loadAvatarRequests(); // load badge count on page open
-    if (window.lucide) lucide.createIcons();
-  </script>
+  <script src="/js/admin/admin.js"></script>
   </div>
 </div>
 <script src="/js/notifications.js"></script>
diff --git a/frontend/js/admin/admin.js b/frontend/js/admin/admin.js
new file mode 100644
index 0000000..64f63cd
--- /dev/null
+++ b/frontend/js/admin/admin.js
@@ -0,0 +1,3449 @@
+'use strict';
+// admin.html — main script (extracted from inline <script> for cleaner HTML caching)
+// Order of operation preserved: loads after api.js + sidebar.js, before notifications/search/mobile
+
+    const { user, isTeacher, isAdmin } = LS.initPage();
+    if (!isTeacher) { window.location.href = '/dashboard'; throw new Error(); }
+    document.getElementById('page-sub').textContent =
+      isAdmin ? 'Администратор · полный доступ' : 'Учитель · просмотр статистики';
+
+    if (isAdmin) {
+      ['btn-tab-subjects','btn-tab-permissions','btn-tab-shop','btn-tab-gam','btn-tab-tpl','btn-tab-sims','btn-tab-games'].forEach(id => {
+        const el = document.getElementById(id);
+        if (el) el.style.display = '';
+      });
+      document.getElementById('admin-nav-system-sep').style.display = '';
+      document.getElementById('admin-nav-system-label').style.display = '';
+    }
+    LS.showBoardIfAllowed();
+    LS.hideDisabledFeatures?.();
+    LS.notif?.init();
+    const MODES   = { exam:'Экзамен', practice:'Тренировка', repeat:'Обычный', ct:'ЦТ/ЦЭ', topic:'По теме', random:'Случайный' };
+    const DIFFS   = { 1:'Лёгкий', 2:'Средний', 3:'Сложный' };
+
+    function pctClass(p) { return p === null ? '' : p >= 75 ? 'pct-hi' : p >= 50 ? 'pct-mid' : 'pct-lo'; }
+    function fmtDate(d) { return new Date(d).toLocaleDateString('ru',{day:'numeric',month:'short',year:'numeric'}); }
+    function fmtTime(sec) {
+      if (!sec || sec < 0) return '—';
+      const m = Math.floor(sec / 60), s = sec % 60;
+      return m ? `${m} мин ${s} сек` : `${s} сек`;
+    }
+
+    /* ─── Tabs ─── */
+    let questionsInited = false, testsInited = false, assignmentsInited = false, usersInited = false, sessionsInited = false, subjectsInited = false, permissionsInited = false, shopInited = false, gamInited = false, tplInited = false, simsInited = false, gamesInited = false, sublogInited = false;
+    function switchTab(btn) {
+      document.querySelectorAll('.tab-pane').forEach(p => p.classList.remove('active'));
+      document.querySelectorAll('.admin-nav-item').forEach(b => b.classList.remove('active'));
+      const name = btn.dataset.tab;
+      document.getElementById('tab-' + name).classList.add('active');
+      btn.classList.add('active');
+      if (name === 'questions'   && !questionsInited)   { questionsInited = true;   loadQuestions(); }
+      if (name === 'tests'       && !testsInited)       { testsInited = true;       loadTests(); }
+      if (name === 'assignments' && !assignmentsInited) { assignmentsInited = true; loadAssignments(); }
+      if (name === 'subjects'    && !subjectsInited)    { subjectsInited = true;    loadSubjectConfig(); }
+      if (name === 'users'       && !usersInited)       { usersInited = true;       loadUsers(); }
+      if (name === 'sessions'    && !sessionsInited)    { sessionsInited = true;    loadSessions(); }
+      if (name === 'permissions' && !permissionsInited) { permissionsInited = true; loadPermissions(); }
+      if (name === 'shop'        && !shopInited)        { shopInited = true;        loadShopAdmin(); }
+      if (name === 'gam'         && !gamInited)         { gamInited = true;         loadGamAdmin(); }
+      if (name === 'tpl'         && !tplInited)         { tplInited = true;         loadTplAdmin(); }
+      if (name === 'sims'        && !simsInited)        { simsInited = true;         loadSimsAdmin(); }
+      if (name === 'games'       && !gamesInited)       { gamesInited = true;        loadGamesAdmin(); loadFsFeatures(); }
+      if (name === 'sublog'      && !sublogInited)      { sublogInited = true;       loadSubmissionLog(); }
+    }
+
+    /* Переход к вопросам конкретного предмета с открытием формы */
+    async function goAddQuestion(slug) {
+      // переключаем на вкладку Вопросы
+      const qBtn = document.querySelector('[data-tab="questions"]');
+      switchTab(qBtn);
+      // выставляем предмет в фильтре и обновляем список
+      document.getElementById('q-subject').value = slug;
+      if (!questionsInited) { questionsInited = true; }
+      await loadQuestions();
+      // открываем форму с предзаполненным предметом
+      openQModal();
+      document.getElementById('qf-subject').value = slug;
+      await loadQModalTopics();
+    }
+
+    /* ════════════════════════════════════════════════
+       СТАТИСТИКА
+    ════════════════════════════════════════════════ */
+    async function loadStats() {
+      try {
+        const s = await LS.adminGetStats();
+        document.getElementById('stats-grid').innerHTML = `
+          <div class="stat-card" style="--stat-top:var(--violet)">
+            <div class="stat-card-icon" style="background:rgba(155,93,229,0.1)"><i data-lucide="users" class="stat-icon"></i></div>
+            <div class="stat-val violet">${s.totalUsers}</div>
+            <div class="stat-label">Пользователей</div>
+          </div>
+          <div class="stat-card" style="--stat-top:var(--cyan)">
+            <div class="stat-card-icon" style="background:rgba(6,214,224,0.1)"><i data-lucide="file-text" class="stat-icon"></i></div>
+            <div class="stat-val cyan">${s.totalTests}</div>
+            <div class="stat-label">Тестов пройдено</div>
+          </div>
+          <div class="stat-card" style="--stat-top:var(--green)">
+            <div class="stat-card-icon" style="background:rgba(6,214,100,0.1)"><i data-lucide="target" class="stat-icon"></i></div>
+            <div class="stat-val green">${s.avgScore ?? '—'}%</div>
+            <div class="stat-label">Средний результат</div>
+          </div>`;
+        if (window.lucide) lucide.createIcons();
+        const subjEl = document.getElementById('subj-stats');
+        if (!s.bySubject?.length) { subjEl.innerHTML = '<div class="empty">Нет данных</div>'; return; }
+        subjEl.innerHTML = s.bySubject.map(b => {
+          const pct = b.avg_pct ?? 0;
+          const barColor = pct >= 75 ? 'var(--green)' : pct >= 50 ? 'var(--amber)' : 'var(--pink)';
+          return `<div class="subj-stat">
+            <div><div class="subj-stat-name">${esc(b.name)}</div><div class="subj-stat-info">${b.tests} тестов</div></div>
+            <div>
+              <div class="subj-stat-pct">${b.avg_pct ?? '—'}%</div>
+              <div style="width:60px;height:3px;background:rgba(15,23,42,0.06);border-radius:99px;margin-top:5px;overflow:hidden"><div style="width:${pct}%;height:100%;background:${barColor};border-radius:99px"></div></div>
+            </div>
+          </div>`;
+        }).join('');
+      } catch (e) {
+        document.getElementById('stats-grid').innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
+      }
+    }
+
+    /* ════════════════════════════════════════════════
+       РЕДАКТОР ВОПРОСОВ
+    ════════════════════════════════════════════════ */
+    let allQuestions = [];
+    let editingQId   = null;
+    let openQId      = null;
+    let _topicMap    = {};   // topic name (lower) <svg class="ic" viewBox="0 0 24 24"><line x1="5" y1="12" x2="19" y2="12"/><polyline points="12 5 19 12 12 19"/></svg> id, for current subject
+
+    /* ─── KaTeX rendering ─── */
+    const KATEX_OPTS = {
+      delimiters: [
+        { left: '\\(', right: '\\)', display: false },
+        { left: '\\[', right: '\\]', display: true  },
+      ],
+      throwOnError: false,
+    };
+    function renderMath(el) {
+      if (!el) return;
+      const run = () => { if (window.renderMathInElement) renderMathInElement(el, KATEX_OPTS); };
+      if (window._katexReady) run(); else window._katexCb = run;
+    }
+
+    function updateCharCounter(el, cntId, max) {
+      const n = el.value.length;
+      const cnt = document.getElementById(cntId);
+      if (!cnt) return;
+      cnt.textContent = `${n} / ${max}`;
+      cnt.className = 'char-counter' + (n > max * 0.9 ? ' warn' : '') + (n >= max ? ' over' : '');
+    }
+
+    async function onQSubjectChange() {
+      const slug = document.getElementById('q-subject').value;
+      const sel  = document.getElementById('q-topic');
+      sel.innerHTML = '<option value="">Все темы</option>';
+      if (slug) {
+        try {
+          const topics = await LS.getTopics(slug);
+          topics.forEach(t => sel.appendChild(new Option(t.name, t.id)));
+        } catch {}
+      }
+      loadQuestions();
+    }
+
+    async function loadQuestions() {
+      const subject  = document.getElementById('q-subject').value;
+      const topic_id = document.getElementById('q-topic').value;
+      const sort     = document.getElementById('q-sort').value;
+      const wrap     = document.getElementById('q-list-wrap');
+      wrap.innerHTML = LS.skeleton(5);
+      try {
+        allQuestions = await LS.getQuestions(subject || null, topic_id || null, sort);
+        renderQuestions();
+      } catch (e) {
+        wrap.innerHTML = `<div class="error">Ошибка загрузки: ${esc(e.message)}</div>`;
+      }
+    }
+
+    function renderQuestions() {
+      const search   = document.getElementById('q-search').value.toLowerCase();
+      const filtered = search
+        ? allQuestions.filter(q => q.text.toLowerCase().includes(search) || (q.topic||'').toLowerCase().includes(search))
+        : allQuestions;
+
+      document.getElementById('q-count').textContent = `${filtered.length} вопросов`;
+
+      if (!filtered.length) {
+        document.getElementById('q-list-wrap').innerHTML = '<div class="empty">Вопросов не найдено</div>';
+        return;
+      }
+
+      const wrap = document.getElementById('q-list-wrap');
+      wrap.innerHTML =
+        `<div class="q-list">${filtered.map(q => {
+          const diffCls = `diff-${q.difficulty}`;
+          const optsHtml = (q.options || []).map(o =>
+            `<div class="q-opt-row ${o.is_correct ? 'correct' : ''}">
+               <span class="q-opt-icon">${o.is_correct ? '<i data-lucide="check" style="width:13px;height:13px"></i>' : '<svg class="ic" viewBox="0 0 24 24"><circle cx="12" cy="12" r="8"/></svg>'}</span>${esc(o.text)}
+             </div>`).join('');
+          const explHtml = q.explanation
+            ? `<div class="q-expl"><strong>Пояснение:</strong> ${esc(q.explanation)}</div>` : '';
+          return `<div class="q-card" id="qcard-${q.id}">
+            <div class="q-card-head">
+              <span class="q-card-num">#${q.id}</span>
+              <div class="q-card-body" onclick="toggleQDetail(${q.id})">
+                <div class="q-card-text">${esc(q.text)}</div>
+                <div class="q-card-meta">
+                  ${q.subject_name ? `<span class="q-badge q-badge-subj">${esc(q.subject_name)}</span>` : ''}
+                  ${q.topic ? `<span class="q-badge q-badge-topic">${esc(q.topic)}</span>` : ''}
+                  <span class="q-badge ${diffCls}">${DIFFS[q.difficulty]||q.difficulty}</span>
+                  <span style="font-size:0.72rem;color:var(--text-3);background:rgba(15,23,42,0.05);padding:2px 7px;border-radius:999px">${{single:'Один',multi:'Несколько',true_false:'Верно/Неверно',short_answer:'Краткий',matching:'Сопост.'}[q.type]||q.type||'Один'}</span>
+                  <span style="font-size:0.75rem;color:var(--text-3)">${q.options?.length||0} вар.</span>
+                </div>
+              </div>
+              <div class="q-card-actions">
+                <button class="btn-edit-q" onclick="editQ(${q.id})">Изменить</button>
+                <button class="btn-dup-q"  onclick="dupQ(${q.id})" title="Дублировать">⧉</button>
+                <button class="btn-del-q"  onclick="deleteQ(${q.id})" title="Удалить"><i data-lucide="x" style="width:14px;height:14px"></i></button>
+              </div>
+            </div>
+            <div class="q-card-detail" id="qdetail-${q.id}">
+              ${optsHtml}${explHtml}
+            </div>
+          </div>`;
+        }).join('')}</div>`;
+      renderMath(wrap);
+      if (window.lucide) lucide.createIcons();
+    }
+
+    function toggleQDetail(id) {
+      if (openQId === id) {
+        document.getElementById('qdetail-' + id)?.classList.remove('open');
+        openQId = null; return;
+      }
+      if (openQId) document.getElementById('qdetail-' + openQId)?.classList.remove('open');
+      document.getElementById('qdetail-' + id)?.classList.add('open');
+      openQId = id;
+    }
+
+    async function dupQ(id) {
+      try {
+        const { id: newId } = await LS.duplicateQuestion(id);
+        await loadQuestions();
+        // scroll to new card
+        setTimeout(() => document.getElementById('qcard-' + newId)?.scrollIntoView({ behavior:'smooth', block:'center' }), 300);
+      } catch (e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+    }
+
+    async function deleteQ(id) {
+      if (!await LS.confirm(`Удалить вопрос #${id}?`, { title: 'Удалить вопрос', confirmText: 'Удалить' })) return;
+      try {
+        await LS.deleteQuestion(id);
+        allQuestions = allQuestions.filter(q => q.id !== id);
+        renderQuestions();
+      } catch (e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+    }
+
+    /* ─── Question type ─── */
+    let _currentType = 'single';
+    let _matchPairs = []; // [{left:'', right:''}]
+
+    function setQType(type) {
+      _currentType = type;
+      document.querySelectorAll('[data-type]').forEach(b => b.classList.toggle('active', b.dataset.type === type));
+      const isMatching   = type === 'matching';
+      const isShort      = type === 'short_answer';
+      const showOpts     = !isShort && !isMatching;
+      const optsHeader = document.getElementById('qf-opts-header');
+      if (optsHeader) optsHeader.style.display = showOpts ? '' : 'none';
+      document.getElementById('qf-opts').style.display       = showOpts ? '' : 'none';
+      document.getElementById('qf-short-wrap').style.display = isShort    ? '' : 'none';
+      document.getElementById('qf-match-wrap').style.display = isMatching ? '' : 'none';
+      document.getElementById('btn-add-opt').style.display   = showOpts && type !== 'true_false' ? '' : 'none';
+
+      if (type === 'true_false') {
+        initOpts([{ text:'Верно', is_correct:false }, { text:'Неверно', is_correct:false }]);
+      } else if (isShort) {
+        _opts = [];
+      } else if (isMatching) {
+        _opts = [];
+        if (_matchPairs.length === 0) _matchPairs = [{left:'',right:''},{left:'',right:''},{left:'',right:''}];
+        renderMatchRows();
+      } else {
+        if (_opts.length === 0 || _opts[0]?.text === 'Верно') initOpts([{},{},{},{}]);
+        else renderOptRows(_opts);
+      }
+    }
+
+    function renderMatchRows() {
+      const cont = document.getElementById('qf-match-rows');
+      cont.innerHTML = _matchPairs.map((p, i) => `
+        <div style="display:grid;grid-template-columns:1fr 1fr auto;gap:8px;margin-bottom:8px" data-mi="${i}">
+          <input type="text" class="form-ctrl" placeholder="Элемент…" value="${esc(p.left)}"
+            oninput="_matchPairs[${i}].left=this.value" style="margin:0" />
+          <input type="text" class="form-ctrl" placeholder="Пара к нему…" value="${esc(p.right)}"
+            oninput="_matchPairs[${i}].right=this.value" style="margin:0" />
+          <button type="button" onclick="removeMatchPair(${i})" style="border:none;background:none;color:var(--text-3);cursor:pointer;padding:0 6px;display:flex;align-items:center" title="Удалить"><i data-lucide="x" style="width:15px;height:15px"></i></button>
+        </div>`).join('');
+      if (window.lucide) lucide.createIcons();
+    }
+
+    function addMatchPair() {
+      _matchPairs.push({left:'',right:''});
+      renderMatchRows();
+    }
+
+    function removeMatchPair(i) {
+      _matchPairs.splice(i, 1);
+      renderMatchRows();
+    }
+
+    /* ─── Formula bar ─── */
+    let _focusedInput = null;
+    document.addEventListener('focusin', e => {
+      if (e.target.closest && e.target.closest('#q-modal') &&
+          (e.target.tagName === 'TEXTAREA' || (e.target.tagName === 'INPUT' && e.target.type === 'text'))) {
+        _focusedInput = e.target;
+      }
+    });
+
+    function ins(latex) {
+      const el = _focusedInput || document.getElementById('qf-text');
+      if (!el) return;
+      const s = el.selectionStart ?? el.value.length;
+      const e2= el.selectionEnd   ?? el.value.length;
+      const before = el.value.slice(0, s), after = el.value.slice(e2);
+      const opens  = (before.match(/\\\(/g)||[]).length;
+      const closes = (before.match(/\\\)/g)||[]).length;
+      const insert = opens > closes ? latex : `\\(${latex}\\)`;
+      el.value = before + insert + after;
+      el.setSelectionRange(s + insert.length, s + insert.length);
+      el.focus();
+      updateQPreview();
+    }
+
+    function wrapMath() {
+      const el = _focusedInput || document.getElementById('qf-text');
+      if (!el) return;
+      const s = el.selectionStart, e2 = el.selectionEnd;
+      const sel = el.value.slice(s, e2) || 'x';
+      el.value = el.value.slice(0, s) + `\\(${sel}\\)` + el.value.slice(e2);
+      el.focus();
+      updateQPreview();
+    }
+
+    /* ─── Live preview ─── */
+    let _prevTimer = null;
+    function updateQPreview() {
+      clearTimeout(_prevTimer);
+      _prevTimer = setTimeout(() => {
+        const text = document.getElementById('qf-text').value || 'Введите текст вопроса…';
+        const el   = document.getElementById('q-preview-text');
+        el.textContent = text;
+        renderMath(el);
+      }, 150);
+    }
+    // Wire textarea input to preview
+    setTimeout(() => {
+      const ta = document.getElementById('qf-text');
+      if (ta) ta.addEventListener('input', updateQPreview);
+    }, 0);
+
+    /* ─── Dynamic options ─── */
+    const OPT_LETTERS = 'АБВГДЕ';
+
+    function renderOptRows(opts) {
+      const grid    = document.getElementById('qf-opts');
+      const isMulti = _currentType === 'multi';
+      grid.innerHTML = opts.map((o, i) => `
+        <div class="opt-row${o.is_correct ? ' opt-correct' : ''}" data-i="${i}">
+          <span class="opt-letter">${OPT_LETTERS[i]}</span>
+          ${isMulti
+            ? `<input type="checkbox" class="opt-radio" value="${i}" ${o.is_correct ? 'checked' : ''}
+                   onchange="onCheckChange(${i}, this.checked)" />`
+            : `<input type="radio" name="qf-correct" class="opt-radio" value="${i}" ${o.is_correct ? 'checked' : ''}
+                   onchange="onRadioChange(${i})" />`}
+          <input type="text" class="opt-input" placeholder="Вариант ${OPT_LETTERS[i]}"
+                 value="${esc(o.text||'')}" oninput="syncOptText(${i}, this.value)" />
+          ${opts.length > 2
+            ? `<button type="button" class="btn-rem-opt" onclick="removeOpt(${i})" title="Удалить">−</button>`
+            : '<span style="width:24px;flex-shrink:0"></span>'}
+        </div>`).join('');
+      document.getElementById('btn-add-opt').style.display = opts.length >= 6 ? 'none' : '';
+    }
+
+    function onCheckChange(idx, checked) {
+      _opts[idx].is_correct = checked;
+      document.querySelector(`#qf-opts .opt-row[data-i="${idx}"]`)?.classList.toggle('opt-correct', checked);
+    }
+
+    let _opts = [];  // current options state
+
+    function initOpts(opts) {
+      _opts = opts.length ? opts.map(o => ({ text: o.text||'', is_correct: !!o.is_correct }))
+                          : [{text:'',is_correct:false},{text:'',is_correct:false},{text:'',is_correct:false},{text:'',is_correct:false}];
+      renderOptRows(_opts);
+    }
+
+    function onRadioChange(idx) {
+      _opts.forEach((o, i) => o.is_correct = (i === idx));
+      renderOptRows(_opts);
+    }
+
+    function syncOptText(idx, val) { _opts[idx].text = val; }
+
+    function addOpt() {
+      if (_opts.length >= 6) return;
+      _opts.push({ text: '', is_correct: false });
+      renderOptRows(_opts);
+      // focus new input
+      const rows = document.querySelectorAll('#qf-opts .opt-row');
+      rows[rows.length - 1]?.querySelector('input[type=text]')?.focus();
+    }
+
+    function removeOpt(idx) {
+      if (_opts.length <= 2) return;
+      const wasCorrect = _opts[idx].is_correct;
+      _opts.splice(idx, 1);
+      if (wasCorrect && _opts.length > 0) _opts[0].is_correct = true;
+      renderOptRows(_opts);
+    }
+
+    /* ─── Modal ─── */
+    function openQModal(q = null) {
+      editingQId = q ? q.id : null;
+      document.getElementById('q-modal-title').textContent = q ? `Редактировать вопрос #${q.id}` : 'Новый вопрос';
+      const textEl = document.getElementById('qf-text');
+      textEl.value = q?.text || '';
+      updateCharCounter(textEl, 'qf-text-cnt', 500);
+      document.getElementById('qf-explanation').value   = q?.explanation || '';
+      document.getElementById('qf-difficulty').value    = q?.difficulty ?? 2;
+      document.getElementById('qf-subject').value       = q?.subject_slug || '';
+      document.getElementById('qf-topic-text').value    = q?.topic || '';
+      document.getElementById('qf-correct-text').value  = q?.correct_text || '';
+      document.getElementById('qf-error').textContent   = '';
+      const imgVal = q?.image || '';
+      document.getElementById('qf-image').value = imgVal;
+      updateImagePreview(imgVal);
+
+      if (q?.type === 'matching') {
+        _matchPairs = (q.options || []).map(o => ({ left: o.text, right: o.match_pair || '' }));
+        if (!_matchPairs.length) _matchPairs = [{left:'',right:''},{left:'',right:''},{left:'',right:''}];
+      } else {
+        _matchPairs = [];
+      }
+      setQType(q?.type || 'single');
+      if (q?.type !== 'matching') initOpts(q?.options || []);
+      updateQPreview();
+      loadQModalTopics();
+      document.getElementById('q-modal').classList.add('open');
+      setTimeout(() => textEl.focus(), 80);
+    }
+
+    function editQ(id) {
+      const q = allQuestions.find(x => x.id === id);
+      if (q) openQModal(q);
+    }
+
+    function closeQModal() {
+      document.getElementById('q-modal').classList.remove('open');
+      editingQId = null;
+    }
+
+    async function loadQModalTopics() {
+      const slug = document.getElementById('qf-subject').value;
+      const dl   = document.getElementById('qf-topic-list');
+      dl.innerHTML = '';
+      _topicMap = {};
+      if (!slug) return;
+      try {
+        const topics = await LS.getTopics(slug);
+        topics.forEach(t => {
+          dl.appendChild(new Option(t.name));
+          _topicMap[t.name.toLowerCase()] = t.id;
+        });
+      } catch {}
+    }
+
+    async function saveQuestion() {
+      const text         = document.getElementById('qf-text').value.trim();
+      const explanation  = document.getElementById('qf-explanation').value.trim();
+      const difficulty   = Number(document.getElementById('qf-difficulty').value);
+      const subject_slug = document.getElementById('qf-subject').value;
+      const topicText    = document.getElementById('qf-topic-text').value.trim();
+      const type         = _currentType;
+      const errEl        = document.getElementById('qf-error');
+      errEl.textContent  = '';
+
+      if (!subject_slug) { errEl.textContent = 'Выберите предмет'; return; }
+      if (!text)         { errEl.textContent = 'Введите текст вопроса'; return; }
+
+      let options      = null;
+      let correct_text = null;
+
+      if (type === 'short_answer') {
+        correct_text = document.getElementById('qf-correct-text').value.trim();
+        if (!correct_text) { errEl.textContent = 'Введите правильный ответ'; return; }
+      } else if (type === 'matching') {
+        // sync text from DOM inputs
+        document.querySelectorAll('#qf-match-rows [data-mi]').forEach((row, i) => {
+          const [l, r] = row.querySelectorAll('input');
+          if (_matchPairs[i]) { _matchPairs[i].left = l.value.trim(); _matchPairs[i].right = r.value.trim(); }
+        });
+        if (_matchPairs.length < 2) { errEl.textContent = 'Нужно минимум 2 пары'; return; }
+        if (_matchPairs.some(p => !p.left || !p.right)) { errEl.textContent = 'Заполните все пары'; return; }
+        options = _matchPairs.map(p => ({ text: p.left, match_pair: p.right, is_correct: 0 }));
+      } else {
+        // sync any unsaved text from DOM inputs
+        document.querySelectorAll('#qf-opts .opt-row').forEach((row, i) => {
+          if (_opts[i]) _opts[i].text = row.querySelector('input[type=text]').value.trim();
+        });
+        options = _opts.map(o => ({ text: o.text, is_correct: o.is_correct }));
+        if (options.length < 2)           { errEl.textContent = 'Нужно минимум 2 варианта ответа'; return; }
+        if (options.some(o => !o.text))   { errEl.textContent = 'Заполните все варианты ответов'; return; }
+        if (!options.some(o => o.is_correct)) { errEl.textContent = 'Отметьте правильный ответ'; return; }
+      }
+
+      // resolve topic: use id if known, else send topic_name for find-or-create
+      const knownId    = _topicMap[topicText.toLowerCase()];
+      const topic_id   = knownId || null;
+      const topic_name = !knownId && topicText ? topicText : null;
+
+      const image = document.getElementById('qf-image').value.trim() || null;
+
+      const btn = document.getElementById('qf-save');
+      btn.disabled = true; btn.textContent = 'Сохранение…';
+      try {
+        if (editingQId) {
+          await LS.updateQuestion(editingQId, { text, type, correct_text, difficulty, explanation: explanation||null, topic_id, topic_name, options, image });
+        } else {
+          await LS.createQuestion({ subject_slug, topic_id, topic_name, text, type, correct_text, difficulty, explanation: explanation||null, options, image });
+        }
+        closeQModal();
+        loadQuestions();
+      } catch (e) {
+        errEl.textContent = 'Ошибка: ' + e.message;
+      } finally {
+        btn.disabled = false; btn.textContent = 'Сохранить';
+      }
+    }
+
+    /* ── Image upload & preview ── */
+    function updateImagePreview(url) {
+      const wrap = document.getElementById('qf-image-preview');
+      const img  = document.getElementById('qf-image-img');
+      if (url) { img.src = url; wrap.classList.add('visible'); }
+      else     { wrap.classList.remove('visible'); img.src = ''; }
+    }
+
+    function clearQuestionImage() {
+      document.getElementById('qf-image').value = '';
+      updateImagePreview('');
+    }
+
+    async function handleImageFileSelect(input) {
+      const file = input.files[0];
+      if (!file) return;
+      input.value = '';
+      const btn = document.getElementById('btn-img-upload');
+      const lbl = document.getElementById('btn-img-upload-lbl');
+      btn.disabled = true;
+      lbl.textContent = 'Загрузка…';
+      try {
+        const fd = new FormData();
+        fd.append('file', file);
+        fd.append('title', 'Question image: ' + file.name);
+        fd.append('is_public', '1');
+        const res = await fetch('/api/files', {
+          method: 'POST',
+          headers: { Authorization: 'Bearer ' + localStorage.getItem('ls_token') },
+          body: fd
+        });
+        if (!res.ok) throw new Error((await res.json()).error || res.statusText);
+        const { id } = await res.json();
+        const url = `/api/files/${id}/download`;
+        document.getElementById('qf-image').value = url;
+        updateImagePreview(url);
+      } catch (e) {
+        document.getElementById('qf-error').textContent = 'Ошибка загрузки: ' + e.message;
+      } finally {
+        btn.disabled = false;
+        lbl.textContent = 'Загрузить';
+      }
+    }
+
+    document.addEventListener('DOMContentLoaded', () => {
+      const imgInput = document.getElementById('qf-image');
+      if (imgInput) imgInput.addEventListener('input', e => updateImagePreview(e.target.value.trim()));
+    });
+
+    /* ── CSV Import ── */
+    async function importCSVFile(input) {
+      const file = input.files[0];
+      if (!file) return;
+      input.value = '';
+      const fd = new FormData();
+      fd.append('file', file);
+      const btn = document.querySelector('[onclick="document.getElementById(\'csv-file-input\').click()"]');
+      if (btn) { btn.disabled = true; btn.textContent = 'Импорт…'; }
+      try {
+        const { imported, errors } = await LS.importQuestions(fd);
+        LS.toast(`Импортировано: ${imported} вопросов${errors.length ? ` (${errors.length} ошибок)` : ''}`, imported > 0 ? 'success' : 'warn', 5000);
+        loadQuestions();
+      } catch (e) {
+        LS.toast('Ошибка импорта: ' + e.message, 'error');
+      } finally {
+        if (btn) { btn.disabled = false; btn.innerHTML = '<i data-lucide="upload" style="width:14px;height:14px;vertical-align:-2px"></i> Импорт CSV'; if(window.lucide)lucide.createIcons(); }
+      }
+    }
+
+    function downloadCSVTemplate(e) {
+      e.preventDefault();
+      const header = 'subject_slug;topic;text;difficulty;type;opt1;c1;opt2;c2;opt3;c3;opt4;c4;correct_text;explanation;year';
+      const example = [
+        'bio;Клетки;Что является «электростанцией» клетки?;2;single;Митохондрия;1;Рибосома;0;Лизосома;0;Ядро;0;;Митохондрии синтезируют АТФ;2024',
+        'bio;Клетки;Какие органоиды участвуют в синтезе белка?;2;multi;Рибосома;1;Митохондрия;0;Эндоплазматическая сеть;1;Лизосома;0;;',
+        'chem;Кислоты;Формула серной кислоты;1;short_answer;;;;;;;;H2SO4;;',
+      ].join('\n');
+      const blob = new Blob(['\ufeff' + header + '\n' + example], { type: 'text/csv;charset=utf-8' });
+      const a = document.createElement('a');
+      a.href = URL.createObjectURL(blob);
+      a.download = 'questions_template.csv';
+      a.click();
+    }
+
+    /* ════════════════════════════════════════════════
+       ПОЛЬЗОВАТЕЛИ
+    ════════════════════════════════════════════════ */
+    async function loadUsers() {
+      try {
+        const users = await LS.adminGetUsers();
+        const tbody = document.getElementById('users-body');
+        if (!users.length) { tbody.innerHTML = '<tr><td colspan="7"><div class="empty">Пользователей нет</div></td></tr>'; return; }
+        tbody.innerHTML = users.map(u => {
+          const pc = pctClass(u.avg_pct);
+          const initials = (u.name||'?').split(' ').slice(0,2).map(w=>w[0]?.toUpperCase()||'').join('')||'?';
+          const avatarBg = u.role==='admin' ? 'linear-gradient(135deg,#9B5DE5,#c084fc)' : u.role==='teacher' ? 'linear-gradient(135deg,#06D6E0,#9B5DE5)' : u.role==='free_student' ? 'linear-gradient(135deg,#10B981,#059669)' : 'linear-gradient(135deg,#8898AA,#3D4F6B)';
+          const roleCell = isAdmin && u.id !== user.id
+            ? `<select class="role-select" data-uid="${u.id}" onchange="changeRole(this)">
+                <option value="student"      ${u.role==='student'      ?'selected':''}>Ученик</option>
+                <option value="free_student" ${u.role==='free_student' ?'selected':''}>Своб. ученик</option>
+                <option value="teacher"      ${u.role==='teacher'      ?'selected':''}>Учитель</option>
+                <option value="admin"        ${u.role==='admin'        ?'selected':''}>Админ</option>
+               </select>`
+            : `<span class="role-badge ${u.role}">${{student:'Ученик',free_student:'Своб. ученик',teacher:'Учитель',admin:'Админ'}[u.role]||u.role}</span>`;
+          return `<tr class="clickable${u.is_banned ? ' banned-row' : ''}" onclick="openUserPanel(event,${u.id},'${u.role}')">
+            <td>
+              <div style="display:flex;align-items:center;gap:12px">
+                <div style="width:36px;height:36px;border-radius:10px;background:${avatarBg};display:flex;align-items:center;justify-content:center;font-family:'Unbounded',sans-serif;font-size:0.62rem;font-weight:800;color:#fff;flex-shrink:0;${u.is_banned?'filter:grayscale(1);opacity:.5':''}">${initials}</div>
+                <div>
+                  <div style="font-weight:700;font-size:0.88rem;color:var(--text)">${esc(u.name)}${u.is_banned ? ' <span style="font-size:0.7rem;background:rgba(239,68,68,.12);color:#EF4444;border-radius:4px;padding:1px 5px;font-weight:600;vertical-align:middle">заблокирован</span>' : ''}</div>
+                  <div style="color:var(--text-3);font-size:0.76rem">${esc(u.email)}</div>
+                </div>
+              </div>
+            </td>
+            <td onclick="event.stopPropagation()">${roleCell}</td>
+            <td style="font-weight:700">${u.tests_count}</td>
+            <td>
+              <span class="pct-cell ${pc}">${u.avg_pct !== null ? u.avg_pct+'%' : '—'}</span>
+              ${u.avg_pct !== null ? `<div class="perf-bar"><div class="perf-fill ${pc}" style="width:${u.avg_pct}%"></div></div>` : ''}
+            </td>
+            <td style="color:var(--text-3);font-size:0.8rem">${fmtDate(u.created_at)}</td>
+            <td style="color:var(--text-3);font-size:0.8rem">${u.last_login ? new Date(u.last_login).toLocaleDateString('ru',{day:'numeric',month:'short'}) : '—'}</td>
+            <td style="text-align:right;color:var(--text-3);font-size:0.85rem;opacity:0.4">›</td>
+          </tr>`;
+        }).join('');
+      } catch (e) {
+        document.getElementById('users-body').innerHTML = `<tr><td colspan="7" class="error">Ошибка: ${esc(e.message)}</td></tr>`;
+      }
+    }
+
+    async function changeRole(select) {
+      select.disabled = true;
+      try { await LS.adminUpdateRole(select.dataset.uid, select.value); LS.toast('Роль изменена', 'success', 2000); }
+      catch (e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+      finally { select.disabled = false; }
+    }
+
+    let activeTr = null;
+    let activeUid = null;
+    let activeUserRole = null;
+
+    async function openUserPanel(e, uid, role) {
+      if (activeTr) activeTr.classList.remove('selected');
+      activeTr = e.currentTarget; activeTr.classList.add('selected');
+      activeUid = uid;
+      activeUserRole = role;
+      const panel = document.getElementById('user-panel');
+      panel.classList.add('visible');
+      panel.scrollIntoView({ behavior:'smooth', block:'nearest' });
+      document.getElementById('up-sessions').innerHTML = LS.skeleton(3, 'row');
+      document.getElementById('up-name').textContent   = '…';
+      document.getElementById('up-email').textContent  = '';
+      if (isAdmin) {
+        document.getElementById('up-edit-btn').style.display   = '';
+        document.getElementById('up-clear-btn').style.display  = '';
+        document.getElementById('up-perms-btn').style.display  = role === 'teacher' ? '' : 'none';
+        document.getElementById('up-ban-btn').style.display    = '';
+        document.getElementById('up-delete-btn').style.display = '';
+      }
+      await reloadUserPanel(uid);
+    }
+
+    async function reloadUserPanel(uid) {
+      try {
+        const { user: u, sessions } = await LS.adminGetUserSessions(uid);
+        activeUserRole = u.role;
+        document.getElementById('up-name').innerHTML  = LS.esc(u.name) + (u.is_banned ? ' <svg class="ic" viewBox="0 0 24 24"><rect x="3" y="11" width="18" height="11" rx="2" ry="2"/><path d="M7 11V7a5 5 0 0 1 10 0v4"/></svg>' : '');
+        document.getElementById('up-email').textContent = u.email;
+        // Sync button in case role changed after panel was opened
+        if (isAdmin) {
+          document.getElementById('up-perms-btn').style.display = u.role === 'teacher' ? '' : 'none';
+          const banBtn = document.getElementById('up-ban-btn');
+          const banLbl = document.getElementById('up-ban-label');
+          if (u.is_banned) {
+            banBtn.style.background     = 'rgba(34,197,94,.12)';
+            banBtn.style.color          = '#22C55E';
+            banBtn.style.borderColor    = 'rgba(34,197,94,.25)';
+            banLbl.textContent          = 'Разблокировать';
+          } else {
+            banBtn.style.background = '';
+            banBtn.style.color      = '';
+            banBtn.style.borderColor = '';
+            banLbl.textContent      = 'Заблокировать';
+          }
+        }
+        const el = document.getElementById('up-sessions');
+        if (!sessions.length) { el.innerHTML = '<div class="empty">Тестов нет</div>'; return; }
+        el.innerHTML = '<div class="sess-list">' + sessions.map(s => {
+          const pct = s.score !== null ? Math.round((s.score/s.total)*100) : null;
+          return `<div class="sess-item">
+            <div class="sess-pct ${pctClass(pct)}">${pct !== null ? pct+'%' : '—'}</div>
+            <div class="sess-info"><div class="sess-subj">${s.subject_name||'Тест'}</div><div class="sess-meta">${fmtDate(s.started_at)} · ${MODES[s.mode]||s.mode}</div></div>
+            <div class="sess-score">${s.score??'—'} / ${s.total}</div>
+          </div>`;
+        }).join('') + '</div>';
+      } catch (e) { document.getElementById('up-sessions').innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`; }
+    }
+
+    function closeUserPanel() {
+      document.getElementById('user-panel').classList.remove('visible');
+      if (activeTr) { activeTr.classList.remove('selected'); activeTr = null; }
+      activeUid = null;
+    }
+
+    async function clearUserHistory() {
+      const name = document.getElementById('up-name').textContent;
+      if (!await LS.confirm(`Удалить всю историю тестов пользователя «${name}»?\nЭто действие нельзя отменить.`, { title: 'Очистить историю', confirmText: 'Удалить историю' })) return;
+      try {
+        await LS.adminClearUserSessions(activeUid);
+        await reloadUserPanel(activeUid);
+        loadUsers();
+      } catch (e) { LS.toast('Ошибка очистки истории: ' + e.message, 'error'); }
+    }
+
+    async function toggleBanUser() {
+      const banLbl = document.getElementById('up-ban-label');
+      const isBanning = banLbl.textContent === 'Заблокировать';
+      const name = document.getElementById('up-name').innerHTML.replace(' <svg class="ic" viewBox="0 0 24 24"><rect x="3" y="11" width="18" height="11" rx="2" ry="2"/><path d="M7 11V7a5 5 0 0 1 10 0v4"/></svg>','');
+      const msg = isBanning
+        ? `Заблокировать пользователя «${name}»?\nОн не сможет войти в систему.`
+        : `Разблокировать пользователя «${name}»?`;
+      if (!await LS.confirm(msg, { title: isBanning ? 'Блокировка' : 'Разблокировка', confirmText: isBanning ? 'Заблокировать' : 'Разблокировать' })) return;
+      try {
+        await LS.adminBanUser(activeUid, isBanning);
+        LS.toast(isBanning ? 'Пользователь заблокирован' : 'Пользователь разблокирован', isBanning ? 'warning' : 'success');
+        await reloadUserPanel(activeUid);
+        loadUsers();
+      } catch (e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+    }
+
+    async function confirmDeleteUser() {
+      const name = document.getElementById('up-name').innerHTML.replace(' <svg class="ic" viewBox="0 0 24 24"><rect x="3" y="11" width="18" height="11" rx="2" ry="2"/><path d="M7 11V7a5 5 0 0 1 10 0v4"/></svg>','');
+      if (!await LS.confirm(`Удалить пользователя «${name}» навсегда?\nВсе его данные, тесты и прогресс будут удалены. Это действие нельзя отменить.`, { title: 'Удалить пользователя', confirmText: 'Удалить навсегда' })) return;
+      try {
+        await LS.adminDeleteUser(activeUid);
+        LS.toast('Пользователь удалён', 'success');
+        closeUserPanel();
+        loadUsers();
+      } catch (e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+    }
+
+    let _editUid = null;
+    function closeEditUserModal() {
+      document.getElementById('eu-modal').classList.remove('open');
+      _editUid = null;
+    }
+    function openEditUserModal() {
+      _editUid = activeUid;
+      document.getElementById('eu-name').value     = document.getElementById('up-name').textContent;
+      document.getElementById('eu-email').value    = document.getElementById('up-email').textContent;
+      document.getElementById('eu-password').value = '';
+      document.getElementById('eu-error').textContent = '';
+      document.getElementById('eu-modal').classList.add('open');
+      setTimeout(() => document.getElementById('eu-name').focus(), 80);
+    }
+    async function saveEditUser() {
+      const name     = document.getElementById('eu-name').value.trim();
+      const email    = document.getElementById('eu-email').value.trim();
+      const password = document.getElementById('eu-password').value;
+      const errEl    = document.getElementById('eu-error');
+      errEl.textContent = '';
+      if (!name)  { errEl.textContent = 'Введите имя'; return; }
+      if (!email) { errEl.textContent = 'Введите email'; return; }
+      if (password && password.length < 6) { errEl.textContent = 'Пароль должен быть не менее 6 символов'; return; }
+      const payload = { name, email };
+      if (password) payload.password = password;
+      const btn = document.getElementById('eu-save');
+      btn.disabled = true; btn.textContent = 'Сохранение…';
+      try {
+        await LS.adminUpdateUser(_editUid, payload);
+        closeEditUserModal();
+        await reloadUserPanel(activeUid);
+        loadUsers();
+      } catch (e) {
+        errEl.textContent = 'Ошибка: ' + e.message;
+      } finally {
+        btn.disabled = false; btn.textContent = 'Сохранить';
+      }
+    }
+
+    /* ════════════════════════════════════════════════
+       СЕССИИ
+    ════════════════════════════════════════════════ */
+    let allSessions  = [];
+    let openDrawerId = null;
+
+    async function loadSessions() {
+      const subject = document.getElementById('t-subject').value;
+      document.getElementById('t-body').innerHTML = '<div class="spinner"></div>';
+      openDrawerId = null;
+      try {
+        allSessions = await LS.adminGetSessions({ subject: subject || undefined });
+        renderSessions();
+      } catch (e) {
+        document.getElementById('t-body').innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
+      }
+    }
+
+    function sessPctRing(pct) {
+      const pc  = pctClass(pct);
+      const colorMap = {'pct-hi':'var(--green)','pct-mid':'var(--amber)','pct-lo':'var(--pink)'};
+      const color = colorMap[pc] || 'var(--text-3)';
+      const circ = 106.8;
+      const dash = (pct / 100 * circ).toFixed(1);
+      return `<svg class="sess-tl-ring" width="48" height="48" viewBox="0 0 48 48">
+        <circle cx="24" cy="24" r="17" fill="none" stroke="rgba(15,23,42,0.08)" stroke-width="4"/>
+        <circle cx="24" cy="24" r="17" fill="none" stroke="${color}" stroke-width="4"
+          stroke-dasharray="${dash} ${circ}" stroke-dashoffset="26.7" stroke-linecap="round"
+          transform="rotate(-90 24 24)"/>
+        <text x="24" y="28" text-anchor="middle" font-family="Unbounded,sans-serif" font-size="8" font-weight="800" fill="${color}">${pct}%</text>
+      </svg>`;
+    }
+
+    function renderSessions() {
+      const modeF   = document.getElementById('t-mode').value;
+      const searchF = document.getElementById('t-search').value.toLowerCase();
+      const filtered = allSessions.filter(s => {
+        if (modeF && s.mode !== modeF) return false;
+        if (searchF && !s.user_name.toLowerCase().includes(searchF) && !s.user_email.toLowerCase().includes(searchF)) return false;
+        return true;
+      });
+      document.getElementById('t-count').textContent = `${filtered.length} тестов`;
+      if (!filtered.length) {
+        document.getElementById('t-body').innerHTML = '<div class="empty">Нет тестов</div>';
+        return;
+      }
+      // Group by date
+      const groups = {};
+      filtered.forEach(s => {
+        const key = fmtDate(s.started_at);
+        (groups[key] = groups[key] || []).push(s);
+      });
+      document.getElementById('t-body').innerHTML = Object.entries(groups).map(([date, sessions]) =>
+        `<div class="sess-tl-day">${date}</div>
+         <div class="sess-tl-wrap">${sessions.map(s => {
+           const ring = s.percent !== null
+             ? sessPctRing(s.percent)
+             : `<div style="width:48px;height:48px;display:flex;align-items:center;justify-content:center;font-family:'Unbounded',sans-serif;font-size:0.85rem;font-weight:800;color:var(--text-3)">—</div>`;
+           return `<div class="sess-tl-item" id="trow-${s.id}" onclick="toggleDrawer(${s.id})">
+             ${ring}
+             <div class="sess-tl-user">
+               <div class="sess-tl-name">${esc(s.user_name)}</div>
+               <div class="sess-tl-meta">${esc(s.subject_name||'?')} · <span class="mode-badge mode-${s.mode}">${MODES[s.mode]||s.mode}</span></div>
+             </div>
+             <div class="sess-tl-score">${s.score??'—'} / ${s.total}</div>
+             <div class="sess-tl-time">${fmtTime(s.duration_sec)}</div>
+           </div>
+           <div class="sess-tl-drawer" id="tdrawer-${s.id}">
+             <div class="sess-drawer" id="drawer-${s.id}">
+               <div class="sess-drawer-inner" id="drawer-inner-${s.id}"><div class="spinner"></div></div>
+             </div>
+           </div>`;
+         }).join('')}</div>`
+      ).join('');
+    }
+
+    async function toggleDrawer(id) {
+      const drawerEl = document.getElementById('tdrawer-' + id);
+      const drawer   = document.getElementById('drawer-'  + id);
+      const trow     = document.getElementById('trow-'    + id);
+      if (openDrawerId && openDrawerId !== id) {
+        document.getElementById('tdrawer-' + openDrawerId)?.classList.remove('open');
+        document.getElementById('drawer-'  + openDrawerId)?.classList.remove('open');
+        document.getElementById('trow-'    + openDrawerId)?.classList.remove('open');
+      }
+      if (openDrawerId === id) {
+        drawerEl.classList.remove('open'); drawer.classList.remove('open'); trow.classList.remove('open');
+        openDrawerId = null; return;
+      }
+      openDrawerId = id; trow.classList.add('open');
+      drawerEl.classList.add('open');
+      requestAnimationFrame(() => drawer.classList.add('open'));
+      const inner = document.getElementById('drawer-inner-' + id);
+      if (inner.dataset.loaded) return;
+      inner.dataset.loaded = '1';
+      try {
+        const d = await LS.adminGetSessionDetail(id);
+        renderDrawer(inner, d);
+      } catch (e) { inner.innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`; }
+    }
+
+    function renderDrawer(el, d) {
+      const pct     = d.score !== null && d.total ? Math.round((d.score/d.total)*100) : null;
+      const pc      = pctClass(pct);
+      const correct = d.questions.filter(q => q.is_correct).length;
+      const wrong   = d.questions.filter(q => !q.is_correct && q.chosen_option_id).length;
+      const skipped = d.questions.filter(q => !q.chosen_option_id).length;
+      const qHtml   = d.questions.map((q,i) => {
+        const status   = !q.chosen_option_id ? 'skipped' : q.is_correct ? 'correct' : 'wrong';
+        const badgeTxt = { correct:'Верно', wrong:'Неверно', skipped:'Пропущено' }[status];
+        const opts = q.options.map(o => {
+          const isCor = o.is_correct, isCho = o.id === q.chosen_option_id;
+          let cls='', icon='<svg class="ic" viewBox="0 0 24 24"><circle cx="12" cy="12" r="8"/></svg>';
+          if (isCor) { cls='correct-opt'; icon='<i data-lucide="check" style="width:13px;height:13px"></i>'; }
+          else if (isCho && !isCor) { cls='chosen-wrong'; icon='<i data-lucide="x" style="width:13px;height:13px"></i>'; }
+          return `<div class="qb-opt ${cls}"><span class="qb-opt-icon">${icon}</span>${esc(o.text)}</div>`;
+        }).join('');
+        const expl = q.explanation ? `<div class="qb-expl"><strong>Пояснение:</strong> ${esc(q.explanation)}</div>` : '';
+        return `<div class="qb-item ${status}">
+          <div class="qb-header"><span class="qb-qnum">Вопрос ${i+1}</span><span class="qb-badge ${status}">${badgeTxt}</span><span class="qb-time">${q.time_spent_sec?q.time_spent_sec+' сек':''}</span></div>
+          <div class="qb-text">${esc(q.text)}</div>
+          <div class="qb-opts">${opts}</div>${expl}
+        </div>`;
+      }).join('');
+      el.innerHTML = `
+        <div class="drawer-header">
+          <div>
+            <div style="font-family:'Unbounded',sans-serif;font-weight:800;font-size:0.95rem">${esc(d.user_name)}</div>
+            <div class="drawer-meta">${esc(d.user_email)} · ${d.subject_name||'?'} · ${MODES[d.mode]||d.mode} · ${fmtDate(d.started_at)}</div>
+          </div>
+          <div class="drawer-score ${pc}">${pct !== null ? pct+'%' : '—'}</div>
+          <div style="display:flex;gap:20px;margin-left:auto;text-align:center">
+            <div><div style="font-family:'Unbounded',sans-serif;color:var(--green);font-weight:700">${correct}</div><div style="font-size:0.72rem;color:var(--text-3)">Верно</div></div>
+            <div><div style="font-family:'Unbounded',sans-serif;color:var(--pink);font-weight:700">${wrong}</div><div style="font-size:0.72rem;color:var(--text-3)">Неверно</div></div>
+            <div><div style="font-family:'Unbounded',sans-serif;color:var(--text-3);font-weight:700">${skipped}</div><div style="font-size:0.72rem;color:var(--text-3)">Пропущено</div></div>
+            <div><div style="font-family:'Unbounded',sans-serif;color:var(--text-2);font-weight:700">${fmtTime(d.duration_sec)}</div><div style="font-size:0.72rem;color:var(--text-3)">Время</div></div>
+          </div>
+        </div>
+        <div class="qb-list">${qHtml||'<div class="empty">Вопросы не найдены</div>'}</div>`;
+      renderMath(el);
+      if (window.lucide) lucide.createIcons();
+    }
+
+    /* ════════════════════════════════════════════════
+       ТЕСТЫ (ШАБЛОНЫ)
+    ════════════════════════════════════════════════ */
+    let allTests = [];
+    let openTstId = null;
+    let editingTstId = null;
+    const DIFF_LABELS = { 1:'Лёгкий', 2:'Средний', 3:'Сложный' };
+    const TYPE_LABELS = { single:'Один', multi:'Несколько', true_false:'Верно/Нет', short_answer:'Краткий', matching:'Сопоставление' };
+
+    async function loadTests() {
+      const subj = document.getElementById('tst-subj').value;
+      const wrap = document.getElementById('tst-list-wrap');
+      wrap.innerHTML = '<div class="spinner"></div>';
+      try {
+        allTests = await LS.getTests(subj || null);
+        renderTests();
+      } catch (e) {
+        wrap.innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
+      }
+    }
+
+    function renderTests() {
+      const search = document.getElementById('tst-search').value.toLowerCase();
+      const filtered = search ? allTests.filter(t => t.title.toLowerCase().includes(search)) : allTests;
+      document.getElementById('tst-count').textContent = `${filtered.length} тестов`;
+      const wrap = document.getElementById('tst-list-wrap');
+      if (!filtered.length) { wrap.innerHTML = '<div class="empty">Тестов не найдено</div>'; return; }
+      const SUBJ_N = { bio:'Биология', chem:'Химия', math:'Математика', phys:'Физика' };
+      wrap.innerHTML = `<div class="q-list">${filtered.map(t => `
+        <div class="q-card" id="tstcard-${t.id}">
+          <div class="q-card-head">
+            <span class="q-card-num">#${t.id}</span>
+            <div class="q-card-body" onclick="toggleTstDrawer(${t.id})">
+              <div class="q-card-text">${esc(t.title)}</div>
+              <div class="q-card-meta">
+                <span class="q-badge q-badge-subj">${SUBJ_N[t.subject_slug]||t.subject_slug}</span>
+                <span style="font-size:0.75rem;color:var(--text-3)">${t.question_count} вопросов</span>
+                <span style="font-size:0.75rem;color:var(--text-3)">${fmtDate(t.created_at)}</span>
+                ${t.description ? `<span style="font-size:0.75rem;color:var(--text-2)">${esc(t.description)}</span>` : ''}
+              </div>
+            </div>
+            <div class="q-card-actions">
+              <button class="btn-edit-q" onclick="editTst(${t.id})">Изменить</button>
+              <button class="btn-del-q"  onclick="deleteTst(${t.id})" title="Удалить"><i data-lucide="x" style="width:14px;height:14px"></i></button>
+            </div>
+          </div>
+          <div class="tst-drawer" id="tstdrawer-${t.id}" style="display:none">
+            <div class="tst-drawer-inner" id="tstdinner-${t.id}">
+              <div class="spinner"></div>
+            </div>
+          </div>
+        </div>`).join('')}</div>`;
+      if (window.lucide) lucide.createIcons();
+    }
+
+    async function toggleTstDrawer(id) {
+      const drawer = document.getElementById('tstdrawer-' + id);
+      if (!drawer) return;
+      if (openTstId && openTstId !== id) {
+        const old = document.getElementById('tstdrawer-' + openTstId);
+        if (old) old.style.display = 'none';
+      }
+      if (openTstId === id) {
+        drawer.style.display = 'none'; openTstId = null; return;
+      }
+      openTstId = id;
+      drawer.style.display = '';
+      await renderTstDrawer(id);
+    }
+
+    async function renderTstDrawer(id) {
+      const inner = document.getElementById('tstdinner-' + id);
+      if (!inner) return;
+      inner.innerHTML = '<div class="spinner"></div>';
+      try {
+        const [t, subjectQs] = await Promise.all([
+          LS.getTest(id),
+          LS.getQuestions(
+            (_tstPickerCache[id]?.subject_slug) || allTests.find(x => x.id === id)?.subject_slug || '',
+            null, 'date_asc'
+          ).catch(() => []),
+        ]);
+
+        const inIds = new Set(t.questions.map(q => q.id));
+        // Update cache so filterTstPicker can filter locally
+        _tstPickerCache[id] = { subjectQs, inIds, subject_slug: t.subject_slug };
+
+        inner.innerHTML = `
+          <div class="tst-cols">
+            <div>
+              <div class="tst-panel-title">Вопросы в тесте (${t.questions.length})</div>
+              <div class="tst-q-list" id="tstql-${id}">${renderTstQList(t.questions, id)}</div>
+            </div>
+            <div>
+              <div class="tst-panel-title">Добавить вопросы</div>
+              <input class="tst-search" id="tstps-${id}" placeholder="Поиск вопросов…" oninput="filterTstPicker(${id})" />
+              <div class="tst-q-list" id="tstpicker-${id}">${renderTstPicker(subjectQs, inIds, id)}</div>
+            </div>
+          </div>`;
+        renderMath(inner);
+        if (window.lucide) lucide.createIcons();
+      } catch (e) {
+        inner.innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
+      }
+    }
+
+    function qTypeBadge(type) {
+      const MAP = { single:'Один', multi:'Несколько', true_false:'Верно/Нет', short_answer:'Ответ', matching:'Сопост.' };
+      const CLR = { single:'rgba(155,93,229,0.12)', multi:'rgba(6,214,224,0.12)', true_false:'rgba(255,179,71,0.14)', short_answer:'rgba(6,214,100,0.12)', matching:'rgba(241,91,181,0.10)' };
+      const TXT = { single:'var(--violet)', multi:'#05aab3', true_false:'var(--amber)', short_answer:'var(--green)', matching:'var(--pink)' };
+      return `<span class="tst-q-badge" style="background:${CLR[type]||'rgba(15,23,42,0.06)'};color:${TXT[type]||'var(--text-3)'}">${MAP[type]||type}</span>`;
+    }
+
+    function qOptsPreview(q) {
+      if (q.type === 'short_answer') return q.correct_text ? `<span class="tst-q-opts">Ответ: ${esc(q.correct_text)}</span>` : '';
+      if (!q.options?.length) return '';
+      const correct = q.options.filter(o => o.is_correct).map(o => esc(o.text)).join(', ');
+      return `<span class="tst-q-opts"><i data-lucide="check" style="width:12px;height:12px;vertical-align:-2px"></i> ${correct}</span>`;
+    }
+
+    function renderTstQList(questions, tid) {
+      if (!questions.length) return '<div class="tst-empty">Вопросов нет. Добавьте справа <svg class="ic" viewBox="0 0 24 24"><line x1="5" y1="12" x2="19" y2="12"/><polyline points="12 5 19 12 12 19"/></svg></div>';
+      return questions.map((q, i) => `
+        <div class="tst-q-item" id="tstqitem-${tid}-${q.id}">
+          <span class="tst-q-num">${i+1}.</span>
+          <div class="tst-q-body">
+            <span class="tst-q-text">${esc(q.text)}</span>
+            <div class="tst-q-meta">
+              <span class="tst-q-badge diff-${q.difficulty}">${DIFF_LABELS[q.difficulty]||q.difficulty}</span>
+              ${qTypeBadge(q.type)}
+              ${qOptsPreview(q)}
+            </div>
+          </div>
+          <button class="btn-tst-rem" onclick="tstRemoveQ(${tid},${q.id})" title="Убрать">−</button>
+        </div>`).join('');
+    }
+
+    function renderTstPicker(questions, inIds, tid) {
+      if (!questions.length) return '<div class="tst-empty">Вопросов нет в этом предмете</div>';
+      return questions.map(q => {
+        const added = inIds.has(q.id);
+        return `<div class="tst-q-item" id="tstpick-${tid}-${q.id}">
+          <div class="tst-q-body">
+            <span class="tst-q-text">${esc(q.text)}</span>
+            <div class="tst-q-meta">
+              <span class="tst-q-badge diff-${q.difficulty}">${DIFF_LABELS[q.difficulty]||''}</span>
+              ${qTypeBadge(q.type)}
+              ${qOptsPreview(q)}
+            </div>
+          </div>
+          <button class="btn-tst-add${added?' added':''}" id="tstbtn-${tid}-${q.id}"
+                  title="${added?'Уже в тесте':'Добавить'}" ${added?'disabled':'onclick="tstAddQ('+tid+','+q.id+')"'}>${added?'<i data-lucide="check" style="width:14px;height:14px"></i>':'+'}</button>
+        </div>`;
+      }).join('');
+    }
+
+    // Cache for picker: { tid: { subjectQs:[], inIds: Set } }
+    const _tstPickerCache = {};
+
+    async function filterTstPicker(tid) {
+      const search = document.getElementById('tstps-'+tid)?.value.toLowerCase() || '';
+      const cache  = _tstPickerCache[tid];
+      if (!cache) return; // not loaded yet
+      const filtered = search
+        ? cache.subjectQs.filter(q => q.text.toLowerCase().includes(search))
+        : cache.subjectQs;
+      const picker = document.getElementById('tstpicker-'+tid);
+      if (picker) { picker.innerHTML = renderTstPicker(filtered, cache.inIds, tid); renderMath(picker); if(window.lucide)lucide.createIcons(); }
+    }
+
+    async function tstAddQ(tid, qid) {
+      const btn = document.getElementById(`tstbtn-${tid}-${qid}`);
+      if (btn) { btn.disabled = true; btn.textContent = '…'; }
+      try {
+        await LS.addQuestionsToTest(tid, [qid]);
+        const t = allTests.find(x => x.id === tid);
+        if (t) t.question_count++;
+        renderTests();
+        openTstId = tid;
+        document.getElementById('tstdrawer-' + tid).style.display = '';
+        await renderTstDrawer(tid);
+      } catch (e) { LS.toast('Ошибка: ' + e.message, 'error'); if (btn) { btn.disabled=false; btn.textContent='+'; } }
+    }
+
+    async function tstRemoveQ(tid, qid) {
+      try {
+        await LS.removeQFromTest(tid, qid);
+        const t = allTests.find(x => x.id === tid);
+        if (t) t.question_count = Math.max(0, t.question_count - 1);
+        renderTests();
+        openTstId = tid;
+        document.getElementById('tstdrawer-' + tid).style.display = '';
+        await renderTstDrawer(tid);
+      } catch (e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+    }
+
+    /* ── Test modal ── */
+    let _tstShowAnswers = true;
+    function setTstShowAnswers(val) {
+      _tstShowAnswers = val;
+      document.getElementById('tstf-show-yes').classList.toggle('active',  val);
+      document.getElementById('tstf-show-no').classList.toggle('active', !val);
+    }
+
+    function openTstModal(t = null) {
+      editingTstId = t ? t.id : null;
+      document.getElementById('tst-modal-title').textContent = t ? `Редактировать: ${t.title}` : 'Создать тест';
+      document.getElementById('tstf-title').value   = t?.title || '';
+      document.getElementById('tstf-subject').value = t?.subject_slug || '';
+      document.getElementById('tstf-desc').value    = t?.description || '';
+      document.getElementById('tstf-time').value    = t?.time_limit || '';
+      document.getElementById('tstf-error').textContent = '';
+      setTstShowAnswers(t ? (t.show_answers !== 0) : true);
+      document.getElementById('tst-modal').classList.add('open');
+      setTimeout(() => document.getElementById('tstf-title').focus(), 80);
+    }
+
+    function editTst(id) {
+      const t = allTests.find(x => x.id === id);
+      if (t) openTstModal(t);
+    }
+
+    function closeTstModal() {
+      document.getElementById('tst-modal').classList.remove('open');
+      editingTstId = null;
+    }
+
+    async function saveTst() {
+      const title       = document.getElementById('tstf-title').value.trim();
+      const subject_slug= document.getElementById('tstf-subject').value;
+      const description = document.getElementById('tstf-desc').value.trim();
+      const errEl       = document.getElementById('tstf-error');
+      errEl.textContent = '';
+      if (!title)        { errEl.textContent = 'Введите название'; return; }
+      if (!subject_slug) { errEl.textContent = 'Выберите предмет'; return; }
+
+      const btn = document.getElementById('tstf-save');
+      btn.disabled = true; btn.textContent = 'Сохранение…';
+      const show_answers = _tstShowAnswers ? 1 : 0;
+      const timeVal = parseInt(document.getElementById('tstf-time').value, 10);
+      const time_limit = timeVal >= 1 ? Math.min(600, timeVal) : null;
+      try {
+        if (editingTstId) {
+          await LS.updateTest(editingTstId, { title, subject_slug, description: description||null, show_answers, time_limit });
+          const idx = allTests.findIndex(x => x.id === editingTstId);
+          if (idx !== -1) Object.assign(allTests[idx], { title, subject_slug, description, show_answers, time_limit });
+        } else {
+          const { id } = await LS.createTest({ title, subject_slug, description: description||null, show_answers, time_limit });
+          allTests.unshift({ id, title, subject_slug, description, question_count: 0, created_at: new Date().toISOString() });
+          closeTstModal();
+          renderTests();
+          // Auto-open drawer so teacher can immediately add questions
+          openTstId = id;
+          document.getElementById('tstdrawer-' + id).style.display = '';
+          await renderTstDrawer(id);
+          return;
+        }
+        closeTstModal();
+        renderTests();
+      } catch (e) {
+        errEl.textContent = 'Ошибка: ' + e.message;
+      } finally {
+        btn.disabled = false; btn.textContent = 'Сохранить';
+      }
+    }
+
+    async function deleteTst(id) {
+      const t = allTests.find(x => x.id === id);
+      if (!await LS.confirm(`Удалить тест «${t?.title}»?`, { title: 'Удалить тест', confirmText: 'Удалить' })) return;
+      try {
+        await LS.deleteTest(id);
+        allTests = allTests.filter(x => x.id !== id);
+        if (openTstId === id) openTstId = null;
+        renderTests();
+      } catch (e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+    }
+
+    /* ════════════════════════════════════════════════
+       ЗАДАНИЯ
+    ════════════════════════════════════════════════ */
+    let allAssignments  = [];
+    let editingAId      = null;
+    const SUBJ_NAMES    = { bio:'Биология', chem:'Химия', math:'Математика', phys:'Физика' };
+
+    async function loadAssignments() {
+      document.getElementById('a-body').innerHTML = '<div class="spinner"></div>';
+      try {
+        allAssignments = await LS.teacherAssignments();
+        renderAssignments();
+      } catch (e) {
+        document.getElementById('a-body').innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
+      }
+    }
+
+    const SUBJ_COLORS_A = { bio:'#9B5DE5', chem:'#06D6A0', math:'#06B6D4', phys:'#F59E0B' };
+    const SUBJ_ICONS_A  = { bio:'dna', chem:'flask-conical', math:'calculator', phys:'zap' };
+    let _aFilter = 'all';
+
+    function setAFilter(f) {
+      _aFilter = f;
+      document.querySelectorAll('.a-f-chip').forEach(c =>
+        c.classList.toggle('active', c.textContent.trim() === {all:'Все',active:'Активные',overdue:'Просрочены',done:'Завершены'}[f])
+      );
+      renderAssignments();
+    }
+
+    function aClassify(a) {
+      const pct = a.total_members ? Math.round(a.completed_count / a.total_members * 100) : null;
+      if (pct === 100) return 'done';
+      if (a.deadline && new Date(a.deadline) < new Date()) return 'overdue';
+      return 'active';
+    }
+
+    function renderAssignments() {
+      const subjF   = document.getElementById('a-subject').value;
+      const searchF = document.getElementById('a-search').value.toLowerCase();
+      const sortF   = document.getElementById('a-sort')?.value || 'date';
+
+      let list = allAssignments.filter(a => {
+        if (subjF   && a.subject_slug !== subjF) return false;
+        if (searchF && !a.title.toLowerCase().includes(searchF)) return false;
+        if (_aFilter === 'active'  && aClassify(a) !== 'active')  return false;
+        if (_aFilter === 'overdue' && aClassify(a) !== 'overdue') return false;
+        if (_aFilter === 'done'    && aClassify(a) !== 'done')    return false;
+        return true;
+      });
+
+      // Sort
+      list = [...list].sort((a, b) => {
+        if (sortF === 'deadline') {
+          const da = a.deadline ? new Date(a.deadline) : new Date(9e15);
+          const db = b.deadline ? new Date(b.deadline) : new Date(9e15);
+          return da - db;
+        }
+        if (sortF === 'progress_asc') {
+          const pa = a.total_members ? a.completed_count / a.total_members : 0;
+          const pb = b.total_members ? b.completed_count / b.total_members : 0;
+          return pa - pb;
+        }
+        if (sortF === 'progress_desc') {
+          const pa = a.total_members ? a.completed_count / a.total_members : 0;
+          const pb = b.total_members ? b.completed_count / b.total_members : 0;
+          return pb - pa;
+        }
+        return 0; // date: keep server order
+      });
+
+      // Summary chips
+      const all     = allAssignments;
+      const nActive  = all.filter(a => aClassify(a) === 'active').length;
+      const nOverdue = all.filter(a => aClassify(a) === 'overdue').length;
+      const nDone    = all.filter(a => aClassify(a) === 'done').length;
+      document.getElementById('a-summary').innerHTML = [
+        `<span class="a-sum-chip s-all">Всего: ${all.length}</span>`,
+        nActive  ? `<span class="a-sum-chip s-active">Активных: ${nActive}</span>`    : '',
+        nOverdue ? `<span class="a-sum-chip s-overdue">Просрочено: ${nOverdue}</span>` : '',
+        nDone    ? `<span class="a-sum-chip s-done">Завершено: ${nDone}</span>`        : '',
+      ].join('');
+
+      document.getElementById('a-count').textContent = `${list.length} заданий`;
+      const container = document.getElementById('a-body');
+
+      if (!list.length) {
+        container.innerHTML = '<div class="empty">Заданий нет</div>';
+        return;
+      }
+
+      const now = new Date();
+      container.innerHTML = list.map(a => {
+        const pct      = a.total_members ? Math.round(a.completed_count / a.total_members * 100) : null;
+        const cls      = aClassify(a);
+        const rowCls   = cls === 'overdue' ? 'a-overdue' : cls === 'done' ? 'a-done' : '';
+        const sColor   = SUBJ_COLORS_A[a.subject_slug] || '#9B5DE5';
+        const dlMs     = a.deadline ? new Date(a.deadline) - now : Infinity;
+        const isUrgent = cls === 'active' && dlMs > 0 && dlMs < 24 * 3600 * 1000;
+
+        const dl = a.deadline
+          ? new Date(a.deadline).toLocaleDateString('ru', {day:'numeric', month:'short'})
+          : null;
+
+        const targetStr = a.target_user_id
+          ? esc(a.target_user_name || 'Ученик')
+          : esc(a.class_name || '—');
+
+        const metaParts = [
+          targetStr,
+          SUBJ_NAMES[a.subject_slug] || a.subject_slug,
+          `<span class="mode-badge mode-${a.mode}">${MODES[a.mode]||a.mode}</span>`,
+          a.count + ' вопр.',
+          dl ? `до ${dl}` : null,
+          isUrgent  ? `<span class="a-tag-urgent"><i data-lucide="zap" style="width:10px;height:10px;vertical-align:-1px"></i> срочно</span>` : null,
+          cls === 'overdue' ? `<span class="a-tag-over">просрочено</span>` : null,
+        ].filter(Boolean);
+
+        const barColor = pct >= 75 ? '#06D6A0' : pct >= 40 ? '#F59E0B' : '#F15BB5';
+        const pctLabel = pct !== null ? `${pct}%` : '—';
+
+        return `<div class="a-row ${rowCls}${isUrgent ? ' a-urgent' : ''}" style="--ac:${sColor}">
+          <div class="a-icon" style="background:${sColor}18;color:${sColor}"><i data-lucide="${SUBJ_ICONS_A[a.subject_slug]||'file-text'}" style="width:18px;height:18px"></i></div>
+          <div class="a-main">
+            <div class="a-title">${esc(a.title)}</div>
+            <div class="a-meta">${metaParts.join(' · ')}</div>
+          </div>
+          <div class="a-prog">
+            <div class="a-prog-nums">
+              <span>${a.completed_count} / ${a.total_members} сдали</span>
+              <span class="a-prog-pct ${pctClass(pct)}">${pctLabel}</span>
+            </div>
+            <div class="a-prog-bar">
+              <div class="a-prog-fill" style="width:${pct||0}%;background:${barColor}"></div>
+            </div>
+          </div>
+          <div class="a-actions">
+            <button class="btn-edit-q" onclick="openAModal(${a.id})">Изменить</button>
+            <button class="btn-del-q"  onclick="deleteAsgn(${a.id})"><i data-lucide="x" style="width:14px;height:14px"></i></button>
+          </div>
+        </div>`;
+      }).join('');
+      if (window.lucide) lucide.createIcons();
+    }
+
+    let _afSrc = 'random';
+    let _afLoadedTests = [];
+
+    function setAfSrc(src) {
+      _afSrc = src;
+      document.querySelectorAll('[data-afsrc]').forEach(b => b.classList.toggle('active', b.dataset.afsrc === src));
+      document.getElementById('af-random-fields').style.display = src === 'random' ? '' : 'none';
+      document.getElementById('af-test-fields').style.display   = src === 'test'   ? '' : 'none';
+    }
+
+    async function openAModal(id) {
+      const a = allAssignments.find(x => x.id === id);
+      if (!a) return;
+      editingAId = id;
+      document.getElementById('a-modal-title').textContent = `Редактировать: ${a.title}`;
+      document.getElementById('af-title').value    = a.title;
+      document.getElementById('af-deadline').value = a.deadline ? a.deadline.split('T')[0] : '';
+      document.getElementById('af-error').textContent = '';
+
+      // Load tests for the dropdown
+      const testSel = document.getElementById('af-test');
+      testSel.innerHTML = '<option value="">Загрузка…</option>';
+      try {
+        _afLoadedTests = await LS.getTests();
+        testSel.innerHTML = _afLoadedTests.length
+          ? '<option value="">— выберите тест —</option>' + _afLoadedTests.map(t => `<option value="${t.id}">${esc(t.title)} (${t.question_count} вопр.)</option>`).join('')
+          : '<option value="">Нет тестов</option>';
+      } catch {
+        testSel.innerHTML = '<option value="">Ошибка загрузки</option>';
+        _afLoadedTests = [];
+      }
+
+      if (a.test_id) {
+        setAfSrc('test');
+        testSel.value = a.test_id;
+        document.getElementById('af-mode-test').value = a.mode;
+      } else {
+        setAfSrc('random');
+        document.getElementById('af-subject').value = a.subject_slug;
+        document.getElementById('af-mode').value    = a.mode;
+        document.getElementById('af-count').value   = a.count;
+      }
+
+      document.getElementById('a-modal').classList.add('open');
+      setTimeout(() => document.getElementById('af-title').focus(), 80);
+    }
+
+    function closeAModal() {
+      document.getElementById('a-modal').classList.remove('open');
+      editingAId = null;
+    }
+
+    async function saveAssignment() {
+      const title    = document.getElementById('af-title').value.trim();
+      const deadline = document.getElementById('af-deadline').value || null;
+      const errEl    = document.getElementById('af-error');
+      errEl.textContent = '';
+      if (!title) { errEl.textContent = 'Введите название'; return; }
+
+      let payload = { title, deadline };
+
+      if (_afSrc === 'test') {
+        const test_id = document.getElementById('af-test').value;
+        const mode    = document.getElementById('af-mode-test').value;
+        if (!test_id) { errEl.textContent = 'Выберите тест'; return; }
+        const testObj = _afLoadedTests.find(t => t.id === Number(test_id));
+        if (testObj && testObj.question_count === 0) { errEl.textContent = 'В выбранном тесте нет вопросов'; return; }
+        payload = { ...payload, test_id: Number(test_id), mode };
+      } else {
+        const subject_slug = document.getElementById('af-subject').value;
+        const mode         = document.getElementById('af-mode').value;
+        const count        = Number(document.getElementById('af-count').value);
+        if (!subject_slug)       { errEl.textContent = 'Выберите предмет'; return; }
+        if (!count || count < 1) { errEl.textContent = 'Введите количество вопросов'; return; }
+        payload = { ...payload, subject_slug, mode, count, test_id: null };
+      }
+
+      const btn = document.getElementById('af-save');
+      btn.disabled = true; btn.textContent = 'Сохранение…';
+      try {
+        await LS.updateAssignment(editingAId, payload);
+        const idx = allAssignments.findIndex(x => x.id === editingAId);
+        if (idx !== -1) Object.assign(allAssignments[idx], payload);
+        closeAModal();
+        renderAssignments();
+      } catch (e) {
+        errEl.textContent = 'Ошибка: ' + e.message;
+      } finally {
+        btn.disabled = false; btn.textContent = 'Сохранить';
+      }
+    }
+
+    /* ─── Create assignment modal ─── */
+    let _acSrc    = 'random'; // 'random' | 'test'
+    let _acTarget = 'class';  // 'class' | 'user'
+
+    let _acFileId = null, _acAllFiles = null;
+    let _acStudentId = null, _acAllStudents = null;
+
+    function setAcTarget(t) {
+      _acTarget = t;
+      document.querySelectorAll('[data-actgt]').forEach(b => b.classList.toggle('active', b.dataset.actgt === t));
+      document.getElementById('acf-class-field').style.display = t === 'class' ? '' : 'none';
+      document.getElementById('acf-user-field').style.display  = t === 'user'  ? '' : 'none';
+      if (t === 'user' && !_acAllStudents) loadAcStudents();
+    }
+
+    async function loadAcStudents() {
+      const drop = document.getElementById('acf-student-drop');
+      drop.innerHTML = '<div style="padding:8px 12px;font-size:13px;color:#9ca3af">Загрузка…</div>';
+      drop.style.display = '';
+      try {
+        _acAllStudents = await LS.getStudentsList();
+        openAcStudentDrop();
+      } catch(e) {
+        _acAllStudents = [];
+        drop.innerHTML = `<div style="padding:8px 12px;font-size:13px;color:#ef4444">Ошибка загрузки: ${e.message}</div>`;
+      }
+    }
+
+    function filterAcStudents(q) {
+      openAcStudentDrop(q);
+    }
+
+    function openAcStudentDrop(q) {
+      const drop = document.getElementById('acf-student-drop');
+      if (_acAllStudents === null) { loadAcStudents(); return; }
+      const list = _acAllStudents;
+      const term = (q !== undefined ? q : document.getElementById('acf-student-search').value).toLowerCase().trim();
+      const filtered = term ? list.filter(s => s.name.toLowerCase().includes(term) || s.email.toLowerCase().includes(term)) : list;
+      if (!filtered.length) {
+        drop.innerHTML = '<div style="padding:8px 12px;font-size:13px;color:#9ca3af">Нет учеников</div>';
+        drop.style.display = '';
+        return;
+      }
+      drop.innerHTML = filtered.slice(0, 50).map(s =>
+        `<div style="padding:8px 12px;cursor:pointer;border-bottom:1px solid #f3f4f6;font-size:13px" data-id="${s.id}" data-name="${esc(s.name)}" data-email="${esc(s.email)}" onmousedown="selectAcStudent(+this.dataset.id,this.dataset.name,this.dataset.email)" onmouseover="this.style.background='#f9fafb'" onmouseout="this.style.background=''">${esc(s.name)} <span style="color:#9ca3af">${esc(s.email)}</span></div>`
+      ).join('');
+      drop.style.display = '';
+    }
+
+    function closeAcStudentDrop() {
+      document.getElementById('acf-student-drop').style.display = 'none';
+    }
+
+    function selectAcStudent(id, name, email) {
+      _acStudentId = id;
+      document.getElementById('acf-student-search').value = name;
+      document.getElementById('acf-student-selected').textContent = `${name} (${email})`;
+      document.getElementById('acf-student-selected').style.display = '';
+      closeAcStudentDrop();
+    }
+
+    function setAcSrc(src) {
+      _acSrc = src;
+      document.querySelectorAll('[data-src]').forEach(b => b.classList.toggle('active', b.dataset.src === src));
+      document.getElementById('acf-random-fields').style.display = src === 'random' ? '' : 'none';
+      document.getElementById('acf-test-fields').style.display   = src === 'test'   ? '' : 'none';
+      document.getElementById('acf-file-fields').style.display   = src === 'file'   ? '' : 'none';
+      if (src === 'file' && !_acAllFiles) loadAcFiles();
+    }
+
+    async function loadAcFiles() {
+      try {
+        _acAllFiles = await LS.getFiles();
+        renderAcFiles('');
+      } catch { _acAllFiles = []; }
+    }
+
+    function renderAcFiles(q) {
+      const el = document.getElementById('acf-file-list');
+      if (!_acAllFiles) { el.innerHTML = '<div style="padding:10px;color:var(--text-3);font-size:.82rem;text-align:center">Загрузка…</div>'; return; }
+      const lq = q.toLowerCase();
+      const items = q ? _acAllFiles.filter(f => (f.title||'').toLowerCase().includes(lq)) : _acAllFiles;
+      const SUBJ = { bio:'Биология', chem:'Химия', math:'Математика', phys:'Физика' };
+      if (!items.length) { el.innerHTML = '<div style="padding:10px;color:var(--text-3);font-size:.82rem;text-align:center">Нет файлов</div>'; return; }
+      el.innerHTML = items.map(f => `
+        <div onclick="selectAcFile(${f.id},'${esc(f.title||'Файл')}','${f.subject_slug||''}')"
+             style="padding:9px 12px;cursor:pointer;border-bottom:1px solid rgba(15,23,42,0.07);display:flex;align-items:center;gap:8px;${_acFileId===f.id?'background:rgba(155,93,229,0.08);':''} transition:background .15s">
+          <div style="flex:1">
+            <div style="font-size:.84rem;font-weight:600">${esc(f.title||'Файл')}</div>
+            <div style="font-size:.74rem;color:var(--text-3)">${SUBJ[f.subject_slug]||f.subject_slug||''}</div>
+          </div>
+          ${_acFileId===f.id ? '<span style="color:var(--violet)"><i data-lucide="check" style="width:15px;height:15px"></i></span>' : ''}
+        </div>`).join('');
+      if (window.lucide) lucide.createIcons();
+    }
+
+    function filterAcFiles(q) { renderAcFiles(q); }
+
+    function selectAcFile(id, title, subject_slug) {
+      _acFileId = id;
+      renderAcFiles(document.getElementById('acf-file-search').value);
+      const sel = document.getElementById('acf-file-selected');
+      sel.textContent = 'Выбран: ' + title;
+      sel.style.display = '';
+    }
+
+    async function openCreateAModal() {
+      _acSrc = 'random'; _acTarget = 'class'; _acFileId = null; _acStudentId = null; _acAllStudents = null;
+      setAcSrc('random');
+      setAcTarget('class');
+      loadAcStudents(); // preload students so search is ready
+      document.getElementById('acf-title').value          = '';
+      document.getElementById('acf-subject').value         = '';
+      document.getElementById('acf-mode').value            = 'exam';
+      document.getElementById('acf-mode-test').value       = 'exam';
+      document.getElementById('acf-count').value           = '25';
+      document.getElementById('acf-deadline').value        = '';
+      document.getElementById('acf-student-search').value   = '';
+      document.getElementById('acf-student-selected').style.display = 'none';
+      _acStudentId = null;
+      document.getElementById('acf-error').textContent     = '';
+      document.getElementById('acf-file-search').value     = '';
+      document.getElementById('acf-file-selected').style.display = 'none';
+
+      // load classes and tests in parallel
+      const [clsSel, testSel] = [document.getElementById('acf-class'), document.getElementById('acf-test')];
+      clsSel.innerHTML = '<option value="">Загрузка…</option>';
+      testSel.innerHTML = '<option value="">Загрузка…</option>';
+
+      const [classesP, testsP] = await Promise.allSettled([LS.getClasses(), LS.getTests()]);
+
+      if (classesP.status === 'fulfilled') {
+        const classes = classesP.value;
+        clsSel.innerHTML = classes.length
+          ? '<option value="">— выберите класс —</option>' + classes.map(c => `<option value="${c.id}">${esc(c.name)} (${c.member_count} уч.)</option>`).join('')
+          : '<option value="">Нет классов — создайте класс</option>';
+      } else {
+        clsSel.innerHTML = `<option value="">Ошибка загрузки классов</option>`;
+      }
+
+      if (testsP.status === 'fulfilled') {
+        const tests = testsP.value;
+        testSel.innerHTML = tests.length
+          ? '<option value="">— выберите тест —</option>' + tests.map(t => `<option value="${t.id}">${esc(t.title)} (${t.question_count} вопр.)</option>`).join('')
+          : '<option value="">Нет тестов — создайте тест</option>';
+      } else {
+        testSel.innerHTML = `<option value="">Ошибка загрузки тестов</option>`;
+      }
+
+      document.getElementById('ac-modal').classList.add('open');
+      setTimeout(() => document.getElementById('acf-title').focus(), 80);
+    }
+
+    function closeCreateAModal() {
+      document.getElementById('ac-modal').classList.remove('open');
+    }
+
+    async function saveNewAssignment() {
+      const title    = document.getElementById('acf-title').value.trim();
+      const deadline = document.getElementById('acf-deadline').value || null;
+      const errEl    = document.getElementById('acf-error');
+      errEl.textContent = '';
+      if (!title) { errEl.textContent = 'Введите название'; return; }
+
+      let payload = { title, deadline };
+
+      if (_acSrc === 'file') {
+        if (!_acFileId) { errEl.textContent = 'Выберите файл из библиотеки'; return; }
+        const f = _acAllFiles.find(x => x.id === _acFileId);
+        payload = { ...payload, file_id: _acFileId, subject_slug: f?.subject_slug || 'bio', mode: 'exam', count: 1 };
+      } else if (_acSrc === 'test') {
+        const test_id = document.getElementById('acf-test').value;
+        const mode    = document.getElementById('acf-mode-test').value;
+        if (!test_id) { errEl.textContent = 'Выберите тест'; return; }
+        const selOpt = document.querySelector(`#acf-test option[value="${test_id}"]`);
+        if (selOpt && selOpt.textContent.includes('(0 вопр.)')) { errEl.textContent = 'В выбранном тесте нет вопросов. Добавьте вопросы во вкладке «Тесты».'; return; }
+        payload = { ...payload, test_id: Number(test_id), mode };
+      } else {
+        const subject_slug = document.getElementById('acf-subject').value;
+        const mode         = document.getElementById('acf-mode').value;
+        const count        = Number(document.getElementById('acf-count').value);
+        if (!subject_slug) { errEl.textContent = 'Выберите предмет'; return; }
+        if (!count || count < 1) { errEl.textContent = 'Укажите количество вопросов'; return; }
+        payload = { ...payload, subject_slug, mode, count };
+      }
+
+      const btn = document.getElementById('acf-save');
+      btn.disabled = true; btn.textContent = 'Создание…';
+      try {
+        if (_acTarget === 'user') {
+          if (!_acStudentId) { errEl.textContent = 'Выберите ученика из списка'; btn.disabled=false; btn.textContent='Создать'; return; }
+          await LS.createDirectAssignment({ ...payload, student_id: _acStudentId });
+        } else {
+          const class_id = document.getElementById('acf-class').value;
+          if (!class_id) { errEl.textContent = 'Выберите класс'; btn.disabled=false; btn.textContent='Создать'; return; }
+          await LS.createAssignment(class_id, payload);
+        }
+        closeCreateAModal();
+        loadAssignments();
+      } catch (e) {
+        errEl.textContent = 'Ошибка: ' + e.message;
+      } finally {
+        btn.disabled = false; btn.textContent = 'Создать';
+      }
+    }
+
+    async function deleteAsgn(id) {
+      const a = allAssignments.find(x => x.id === id);
+      if (!await LS.confirm(`Удалить задание «${a?.title}»?\nВсе связанные сессии будут удалены.`, { title: 'Удалить задание', confirmText: 'Удалить' })) return;
+      try {
+        await LS.deleteAssignment(id);
+        allAssignments = allAssignments.filter(x => x.id !== id);
+        renderAssignments();
+      } catch (e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+    }
+
+    /* ════════════════════════════════════════════════
+       ДОСТУПНЫЕ ТЕСТЫ — настройка предметов
+    ════════════════════════════════════════════════ */
+    let _subjConfigInited = false;
+    const SC_MODES = { exam: 'Экзамен', practice: 'Пробный тест', topic: 'По теме', random: 'Случайный' };
+    const SC_ICONS  = { bio:'dna', chem:'flask-conical', math:'calculator', phys:'zap' };
+    const SC_COLORS = { bio:'#9B5DE5', chem:'#06D6A0', math:'#06B6D4', phys:'#F59E0B' };
+
+    // кэш тестов по предмету для селектора
+    const _scTests = {};
+    async function loadScTests(slug) {
+      if (_scTests[slug]) return _scTests[slug];
+      const tests = await LS.getTests(slug);
+      _scTests[slug] = tests;
+      return tests;
+    }
+
+    function setSrcMode(slug, src) {
+      const rndBtn  = document.getElementById(`sc-src-rnd-${slug}`);
+      const fixBtn  = document.getElementById(`sc-src-fix-${slug}`);
+      const pick    = document.getElementById(`sc-test-pick-${slug}`);
+      const cntWrap = document.getElementById(`sc-count-wrap-${slug}`);
+      rndBtn.classList.toggle('active', src === 'random');
+      fixBtn.classList.toggle('active', src === 'fixed');
+      pick.classList.toggle('open', src === 'fixed');
+      cntWrap.style.display = src === 'random' ? '' : 'none';
+      if (src === 'fixed') {
+        loadAndRenderTestPick(slug);
+      } else {
+        // скрыть drawer вопросов при переключении на случайный
+        const dr = document.getElementById(`sc-qdr-${slug}`);
+        if (dr) { dr.style.display = 'none'; }
+      }
+    }
+
+    async function loadAndRenderTestPick(slug) {
+      const sel = document.getElementById(`sc-test-sel-${slug}`);
+      if (sel.dataset.loaded) return;
+      sel.innerHTML = '<option value="">Загрузка…</option>';
+      try {
+        const tests = await loadScTests(slug);
+        const cur   = document.getElementById(`sc-card-${slug}`)?.dataset.testId || '';
+        sel.innerHTML = `<option value="">— случайные вопросы —</option>` +
+          tests.map(t => `<option value="${t.id}"${String(t.id) === cur ? ' selected' : ''}>${esc(t.title)} (${t.question_count ?? '?'} вопр.)</option>`).join('');
+        sel.dataset.loaded = '1';
+      } catch(e) {
+        sel.innerHTML = '<option value="">Ошибка загрузки</option>';
+      }
+    }
+
+    async function loadSubjectConfig() {
+      const wrap = document.getElementById('subj-config-list');
+      wrap.innerHTML = LS.skeleton(4);
+      try {
+        const subjects = await LS.getSubjects();
+        wrap.innerHTML = subjects.map(s => {
+          const hasFix = !!s.default_test_id;
+          const color = SC_COLORS[s.slug] || '#9B5DE5';
+          const mode = s.default_mode || 'exam';
+          const count = s.default_count || 25;
+          const srcLabel = hasFix ? 'Фикс. тест' : `${count} вопросов`;
+          return `
+          <div class="sc-card" id="sc-card-${s.slug}" data-test-id="${s.default_test_id || ''}">
+            <div class="sc-row-top" onclick="toggleScCard('${s.slug}')">
+              <div class="sc-icon" style="background:${color}"><i data-lucide="${SC_ICONS[s.slug]||'book'}"></i></div>
+              <div class="sc-info">
+                <div class="sc-name">${esc(s.name)}</div>
+                <div class="sc-summary" id="sc-sum-${s.slug}">
+                  <span class="sc-tag sc-tag-mode">${SC_MODES[mode]}</span>
+                  <span class="sc-tag">${srcLabel}</span>
+                  <span class="sc-qcount">${s.question_count ?? 0} в базе</span>
+                </div>
+              </div>
+              <i data-lucide="chevron-down" class="sc-chevron"></i>
+            </div>
+            <div class="sc-body">
+              <!-- Quick presets -->
+              <div class="sc-presets">
+                <button class="sc-preset${mode==='exam'&&count===25&&!hasFix?' active':''}" onclick="applyPreset('${s.slug}','exam',25)">Экзамен 25</button>
+                <button class="sc-preset${mode==='exam'&&count===40&&!hasFix?' active':''}" onclick="applyPreset('${s.slug}','exam',40)">Экзамен 40</button>
+                <button class="sc-preset${mode==='practice'&&count===15&&!hasFix?' active':''}" onclick="applyPreset('${s.slug}','practice',15)">Практика 15</button>
+                <button class="sc-preset${mode==='practice'&&count===25&&!hasFix?' active':''}" onclick="applyPreset('${s.slug}','practice',25)">Практика 25</button>
+              </div>
+              <!-- Detailed fields -->
+              <div class="sc-fields">
+                <div class="sc-field">
+                  <span class="sc-label">Режим</span>
+                  <select class="sc-select" id="sc-mode-${s.slug}">
+                    ${Object.entries(SC_MODES).map(([v, l]) =>
+                      `<option value="${v}"${mode === v ? ' selected' : ''}>${l}</option>`
+                    ).join('')}
+                  </select>
+                </div>
+                <div class="sc-field">
+                  <span class="sc-label">Источник</span>
+                  <div class="sc-src-toggle">
+                    <button class="sc-src-btn${hasFix ? '' : ' active'}" id="sc-src-rnd-${s.slug}" onclick="setSrcMode('${s.slug}','random')">Случайные</button>
+                    <button class="sc-src-btn${hasFix ? ' active' : ''}" id="sc-src-fix-${s.slug}" onclick="setSrcMode('${s.slug}','fixed')">Из теста</button>
+                  </div>
+                </div>
+                <div class="sc-field" id="sc-count-wrap-${s.slug}" style="${hasFix ? 'display:none' : ''}">
+                  <span class="sc-label">Вопросов</span>
+                  <input class="sc-input" type="number" id="sc-count-${s.slug}" min="5" max="100" value="${count}" />
+                </div>
+                <div class="sc-test-pick${hasFix ? ' open' : ''}" id="sc-test-pick-${s.slug}">
+                  <div class="sc-field">
+                    <span class="sc-label">Тест</span>
+                    <select class="sc-select" id="sc-test-sel-${s.slug}" onchange="onScTestChange('${s.slug}')">
+                      <option value="${s.default_test_id || ''}" selected>Загрузка...</option>
+                    </select>
+                  </div>
+                  <button class="sc-save-add" id="sc-qdr-btn-${s.slug}" style="display:${hasFix?'':'none'};align-self:flex-start"
+                    onclick="toggleScDrawer('${s.slug}')"><i data-lucide="list" style="width:13px;height:13px;vertical-align:-2px"></i> Вопросы</button>
+                </div>
+              </div>
+              <!-- Footer -->
+              <div class="sc-footer">
+                <button class="sc-save" id="sc-save-btn-${s.slug}" onclick="saveSubjectConfig('${s.slug}')">Сохранить</button>
+                <button class="sc-save-add" onclick="goAddQuestion('${s.slug}')"><i data-lucide="plus" style="width:13px;height:13px;vertical-align:-2px"></i> Вопрос</button>
+              </div>
+            </div>
+          </div>
+          <div id="sc-qdr-${s.slug}" style="display:none;border-top:1px solid var(--border);padding:20px 24px;background:rgba(238,242,255,0.5)">
+            <div id="sc-qdr-inner-${s.slug}"></div>
+          </div>`;
+        }).join('');
+        if (window.lucide) lucide.createIcons();
+        // pre-load test selectors and show Вопросы button for subjects already using a fixed test
+        subjects.filter(s => s.default_test_id).forEach(s => {
+          loadAndRenderTestPick(s.slug);
+          const btn = document.getElementById(`sc-qdr-btn-${s.slug}`);
+          if (btn) btn.style.display = '';
+        });
+      } catch (e) {
+        wrap.innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
+      }
+    }
+
+    function toggleScCard(slug) {
+      const card = document.getElementById('sc-card-' + slug);
+      if (!card) return;
+      const wasOpen = card.classList.contains('open');
+      // Close all
+      document.querySelectorAll('.sc-card.open').forEach(c => c.classList.remove('open'));
+      if (!wasOpen) {
+        card.classList.add('open');
+        if (window.lucide) lucide.createIcons({ nodes: [card] });
+      }
+    }
+
+    function applyPreset(slug, mode, count) {
+      document.getElementById('sc-mode-' + slug).value = mode;
+      document.getElementById('sc-count-' + slug).value = count;
+      setSrcMode(slug, 'random');
+      // Highlight active preset
+      const card = document.getElementById('sc-card-' + slug);
+      card.querySelectorAll('.sc-preset').forEach(p => p.classList.remove('active'));
+      const isFix = document.getElementById('sc-src-fix-' + slug).classList.contains('active');
+      card.querySelectorAll('.sc-preset').forEach(p => {
+        const txt = p.textContent.trim();
+        const mLabel = SC_MODES[mode];
+        if (txt === mLabel + ' ' + count && !isFix) p.classList.add('active');
+      });
+      // Auto-save
+      saveSubjectConfig(slug);
+    }
+
+    function updateScSummary(slug) {
+      const el = document.getElementById('sc-sum-' + slug);
+      if (!el) return;
+      const mode = document.getElementById('sc-mode-' + slug).value;
+      const isFix = document.getElementById('sc-src-fix-' + slug).classList.contains('active');
+      const count = document.getElementById('sc-count-' + slug).value;
+      const srcLabel = isFix ? 'Фикс. тест' : count + ' вопросов';
+      el.innerHTML = `<span class="sc-tag sc-tag-mode">${SC_MODES[mode]}</span><span class="sc-tag">${srcLabel}</span>`;
+    }
+
+    function scPreviewText(s) {
+      if (s.default_test_id) return `На дашборде: «${SC_MODES[s.default_mode || 'exam']}», фиксированный тест`;
+      return `На дашборде: «${SC_MODES[s.default_mode || 'exam']}», ${s.default_count || 25} вопросов (случайные)`;
+    }
+
+    async function saveSubjectConfig(slug) {
+      const btn = document.getElementById(`sc-save-btn-${slug}`);
+      const mode   = document.getElementById(`sc-mode-${slug}`).value;
+      const isFix  = document.getElementById(`sc-src-fix-${slug}`).classList.contains('active');
+      const count  = Number(document.getElementById(`sc-count-${slug}`)?.value || 25);
+      const testId = isFix ? (document.getElementById(`sc-test-sel-${slug}`).value || null) : null;
+
+      if (btn) { btn.disabled = true; btn.textContent = '...'; }
+      const payload = { default_mode: mode, default_count: count, default_test_id: testId ? Number(testId) : null };
+      try {
+        await LS.updateSubject(slug, payload);
+        document.getElementById(`sc-card-${slug}`).dataset.testId = testId || '';
+        if (isFix) document.getElementById(`sc-test-sel-${slug}`).dataset.loaded = '';
+        updateScSummary(slug);
+        // Visual feedback
+        if (btn) { btn.classList.add('saved'); btn.textContent = 'Сохранено'; }
+        setTimeout(() => { if (btn) { btn.classList.remove('saved'); btn.textContent = 'Сохранить'; btn.disabled = false; } }, 1500);
+      } catch (e) {
+        LS.toast('Ошибка: ' + e.message, 'error');
+        if (btn) { btn.disabled = false; btn.textContent = 'Сохранить'; }
+      }
+    }
+
+    /* ── Subject drawer: управление вопросами теста ── */
+    function onScTestChange(slug) {
+      const tid = document.getElementById(`sc-test-sel-${slug}`).value;
+      const btn = document.getElementById(`sc-qdr-btn-${slug}`);
+      btn.style.display = tid ? '' : 'none';
+      // скрыть drawer если тест сменился
+      const dr = document.getElementById(`sc-qdr-${slug}`);
+      dr.style.display = 'none';
+      document.getElementById(`sc-qdr-inner-${slug}`).innerHTML = '';
+    }
+
+    const _scDrOpen = {}; // slug <svg class="ic" viewBox="0 0 24 24"><line x1="5" y1="12" x2="19" y2="12"/><polyline points="12 5 19 12 12 19"/></svg> bool
+    async function toggleScDrawer(slug) {
+      const dr  = document.getElementById(`sc-qdr-${slug}`);
+      const tid = Number(document.getElementById(`sc-test-sel-${slug}`).value);
+      if (!tid) return;
+      if (dr.style.display !== 'none') { dr.style.display = 'none'; return; }
+      dr.style.display = '';
+      await renderScDrawer(slug, tid);
+    }
+
+    const _scCache = {}; // tid <svg class="ic" viewBox="0 0 24 24"><line x1="5" y1="12" x2="19" y2="12"/><polyline points="12 5 19 12 12 19"/></svg> { test, subjectQs }
+    async function renderScDrawer(slug, tid) {
+      const inner = document.getElementById(`sc-qdr-inner-${slug}`);
+      inner.innerHTML = LS.skeleton(3, 'row');
+      try {
+        const [t, subjectQs] = await Promise.all([
+          LS.getTest(tid),
+          LS.getQuestions(slug, null, 'date_asc').catch(() => []),
+        ]);
+        _scCache[tid] = { test: t, subjectQs };
+        inner.innerHTML = `
+          <div class="tst-cols">
+            <div>
+              <div class="tst-panel-title">Вопросы в тесте (<span id="sc-qcnt-${tid}">${t.questions.length}</span>)</div>
+              <div class="tst-q-list" id="sc-ql-${tid}">${renderScQList(t.questions, tid, slug)}</div>
+            </div>
+            <div>
+              <div class="tst-panel-title">Добавить из базы</div>
+              <input class="tst-search" placeholder="Поиск…" oninput="filterScPicker(${tid},'${slug}',this.value)" />
+              <div class="tst-q-list" id="sc-pick-${tid}">${renderScPicker(subjectQs, new Set(t.questions.map(q=>q.id)), tid, slug)}</div>
+            </div>
+          </div>`;
+        renderMath(inner);
+      } catch(e) {
+        inner.innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
+      }
+    }
+
+    function renderScQList(questions, tid, slug) {
+      if (!questions.length) return '<div class="tst-empty">Пусто. Добавьте вопросы справа <svg class="ic" viewBox="0 0 24 24"><line x1="5" y1="12" x2="19" y2="12"/><polyline points="12 5 19 12 12 19"/></svg></div>';
+      return questions.map((q,i) => `
+        <div class="tst-q-item" id="sc-qi-${tid}-${q.id}">
+          <span class="tst-q-num">${i+1}.</span>
+          <div class="tst-q-body">
+            <span class="tst-q-text">${esc(q.text)}</span>
+            <div class="tst-q-meta">
+              <span class="tst-q-badge diff-${q.difficulty}">${DIFF_LABELS[q.difficulty]||q.difficulty}</span>
+              ${qTypeBadge(q.type)}
+              ${qOptsPreview(q)}
+            </div>
+          </div>
+          <button class="btn-tst-rem" onclick="scRemoveQ(${tid},'${slug}',${q.id})" title="Убрать">−</button>
+        </div>`).join('');
+    }
+
+    function renderScPicker(questions, inIds, tid, slug) {
+      if (!questions.length) return '<div class="tst-empty">Вопросов нет в этом предмете</div>';
+      return questions.map(q => {
+        const added = inIds.has(q.id);
+        return `
+          <div class="tst-q-item" id="sc-pick-item-${tid}-${q.id}" style="${added?'opacity:0.4;pointer-events:none':''}">
+            <div class="tst-q-body" style="flex:1">
+              <span class="tst-q-text">${esc(q.text)}</span>
+              <div class="tst-q-meta">
+                <span class="tst-q-badge diff-${q.difficulty}">${DIFF_LABELS[q.difficulty]||q.difficulty}</span>
+                ${qTypeBadge(q.type)}
+                ${q.topic ? `<span class="tst-q-badge" style="background:rgba(6,214,224,0.1);color:#05aab3">${esc(q.topic)}</span>` : ''}
+              </div>
+            </div>
+            <button class="btn-tst-add" id="sc-add-btn-${tid}-${q.id}" onclick="scAddQ(${tid},'${slug}',${q.id},this)" title="Добавить">${added?'<i data-lucide="check" style="width:14px;height:14px"></i>':'+' }</button>
+          </div>`;
+      }).join('');
+    }
+
+    function filterScPicker(tid, slug, q) {
+      const cache = _scCache[tid];
+      if (!cache) return;
+      const lq  = q.toLowerCase();
+      const filtered = lq.length < 1
+        ? cache.subjectQs
+        : cache.subjectQs.filter(x => x.text.toLowerCase().includes(lq) || (x.topic||'').toLowerCase().includes(lq));
+      const inIds = new Set(cache.test.questions.map(x=>x.id));
+      document.getElementById(`sc-pick-${tid}`).innerHTML = renderScPicker(filtered, inIds, tid, slug);
+    }
+
+    async function scAddQ(tid, slug, qid, btn) {
+      btn.disabled = true; btn.textContent = '…';
+      try {
+        await LS.addQuestionsToTest(tid, [qid]);
+        // обновить кэш и списки
+        const t = await LS.getTest(tid);
+        _scCache[tid].test = t;
+        const inIds = new Set(t.questions.map(q=>q.id));
+        document.getElementById(`sc-ql-${tid}`).innerHTML   = renderScQList(t.questions, tid, slug);
+        document.getElementById(`sc-qcnt-${tid}`).textContent = t.questions.length;
+        // пометить кнопку в пикере
+        const item = document.getElementById(`sc-pick-item-${tid}-${qid}`);
+        if (item) { item.style.opacity='0.4'; item.style.pointerEvents='none'; }
+        const addBtn = document.getElementById(`sc-add-btn-${tid}-${qid}`);
+        if (addBtn) { addBtn.innerHTML = '<i data-lucide="check" style="width:14px;height:14px"></i>'; if(window.lucide)lucide.createIcons(); }
+        renderMath(document.getElementById(`sc-ql-${tid}`));
+      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); btn.disabled=false; btn.textContent='+'; }
+    }
+
+    async function scRemoveQ(tid, slug, qid) {
+      try {
+        await LS.removeQFromTest(tid, qid);
+        const t = await LS.getTest(tid);
+        _scCache[tid].test = t;
+        const inIds = new Set(t.questions.map(q=>q.id));
+        document.getElementById(`sc-ql-${tid}`).innerHTML    = renderScQList(t.questions, tid, slug);
+        document.getElementById(`sc-qcnt-${tid}`).textContent = t.questions.length;
+        // разблокировать в пикере
+        const item = document.getElementById(`sc-pick-item-${tid}-${qid}`);
+        if (item) { item.style.opacity=''; item.style.pointerEvents=''; }
+        const addBtn = document.getElementById(`sc-add-btn-${tid}-${qid}`);
+        if (addBtn) { addBtn.textContent='+'; addBtn.disabled=false; }
+      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+    }
+
+    /* ─── User permissions modal ───────────────────────────────────────── */
+    let _upPermsData = null;
+
+    function closeUserPermsModal() {
+      document.getElementById('up-modal').classList.remove('open');
+      _upPermsData = null;
+    }
+
+    async function openUserPermsModal() {
+      if (!activeUid) return;
+      const name = document.getElementById('up-name').textContent;
+      document.getElementById('up-modal-title').textContent = `Права: ${name}`;
+      document.getElementById('up-modal-list').innerHTML = LS.skeleton(5, 'row');
+      document.getElementById('up-modal').classList.add('open');
+      try {
+        _upPermsData = await LS.getUserPermissions(activeUid);
+        renderUserPerms();
+      } catch(e) {
+        document.getElementById('up-modal-list').innerHTML = `<p style="color:var(--danger);font-size:13px">Ошибка: ${esc(e.message)}</p>`;
+      }
+    }
+
+    function renderUserPerms() {
+      if (!_upPermsData) return;
+      const list = document.getElementById('up-modal-list');
+      list.innerHTML = _upPermsData.permissions.map(p => {
+        const hasOverride = p.userVal !== undefined;
+        const checked = p.effective;
+        const badge = hasOverride
+          ? `<span style="font-size:10px;padding:2px 7px;border-radius:var(--r-pill);background:rgba(155,93,229,0.12);color:var(--violet);font-weight:700">Инд.</span>`
+          : `<span style="font-size:10px;padding:2px 7px;border-radius:var(--r-pill);background:rgba(136,152,170,0.12);color:var(--text-3);font-weight:700">По роли</span>`;
+        const resetBtn = hasOverride
+          ? `<button style="background:none;border:none;cursor:pointer;color:var(--text-3);padding:3px 6px;border-radius:6px;font-size:11px;font-weight:700;transition:color .2s"
+               onmouseover="this.style.color='var(--danger)'" onmouseout="this.style.color='var(--text-3)'"
+               onclick="doResetOneUserPerm('${esc(p.key)}')" title="Сбросить к роли">×</button>`
+          : '';
+        return `
+          <div class="perm-card${checked ? ' enabled' : ''}" id="up-perm-card-${p.key.replace('.','_')}">
+            <div class="perm-info">
+              <div style="display:flex;align-items:center;gap:7px">
+                <span class="perm-label">${esc(p.label)}</span>
+                ${badge}
+                ${resetBtn}
+              </div>
+              <div class="perm-desc">${esc(p.desc)}</div>
+            </div>
+            <label class="perm-toggle">
+              <input type="checkbox" ${checked ? 'checked' : ''}
+                onchange="doSetUserPerm('${esc(p.key)}', this.checked, this)">
+              <span class="perm-track"></span>
+              <span class="perm-thumb"></span>
+            </label>
+          </div>`;
+      }).join('');
+      // update reset-all btn visibility
+      const hasAny = _upPermsData.permissions.some(p => p.userVal !== undefined);
+      document.getElementById('up-modal-reset-btn').style.opacity = hasAny ? '1' : '0.4';
+    }
+
+    async function doSetUserPerm(key, enabled, checkbox) {
+      checkbox.disabled = true;
+      try {
+        await LS.setUserPermission(activeUid, key, enabled);
+        _upPermsData = await LS.getUserPermissions(activeUid);
+        renderUserPerms();
+        LS.toast(enabled ? 'Право включено' : 'Право отключено', 'success');
+      } catch(e) {
+        checkbox.checked = !enabled;
+        LS.toast('Ошибка: ' + e.message, 'error');
+      } finally {
+        checkbox.disabled = false;
+      }
+    }
+
+    async function doResetOneUserPerm(key) {
+      try {
+        await LS.resetUserPermissions(activeUid, key);
+        _upPermsData = await LS.getUserPermissions(activeUid);
+        renderUserPerms();
+        LS.toast('Сброшено к значению роли', 'success');
+      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+    }
+
+    async function doResetAllUserPerms() {
+      const name = document.getElementById('up-name').textContent;
+      if (!await LS.confirm(`Сбросить все индивидуальные права «${name}»?\nБудут применены права роли.`, { title: 'Сбросить права', confirmText: 'Сбросить' })) return;
+      try {
+        await LS.resetUserPermissions(activeUid);
+        _upPermsData = await LS.getUserPermissions(activeUid);
+        renderUserPerms();
+        LS.toast('Права сброшены к роли', 'success');
+      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+    }
+
+    /* ─── Permissions tab ──────────────────────────────────────────────── */
+    let _permData = null;
+
+    async function loadPermissions() {
+      try {
+        _permData = await LS.getPermissions();
+        renderPermissions();
+      } catch(e) {
+        document.getElementById('perm-teacher').innerHTML =
+          `<p style="color:var(--danger);font-size:13px">Ошибка загрузки: ${esc(e.message)}</p>`;
+      }
+    }
+
+    function renderPermissions() {
+      if (!_permData) return;
+      const { permissions, definitions } = _permData;
+      ['teacher', 'student'].forEach(role => {
+        const container = document.getElementById('perm-' + role);
+        const defs = definitions.filter(d => d.role === role);
+        container.innerHTML = defs.map(def => {
+          const enabled = permissions[role]?.[def.key] ?? def.default;
+          return `
+            <div class="perm-card${enabled ? ' enabled' : ''}" id="perm-card-${role}-${def.key.replace('.','_')}">
+              <div class="perm-info">
+                <div class="perm-label">${esc(def.label)}</div>
+                <div class="perm-desc">${esc(def.desc)}</div>
+              </div>
+              <label class="perm-toggle" title="${enabled ? 'Выключить' : 'Включить'}">
+                <input type="checkbox" ${enabled ? 'checked' : ''}
+                  onchange="togglePermission('${esc(role)}','${esc(def.key)}',this.checked,this)">
+                <span class="perm-track"></span>
+                <span class="perm-thumb"></span>
+              </label>
+            </div>`;
+        }).join('');
+      });
+    }
+
+    async function togglePermission(role, key, enabled, checkbox) {
+      checkbox.disabled = true;
+      try {
+        await LS.setPermission(role, key, enabled);
+        // update local cache
+        if (!_permData.permissions[role]) _permData.permissions[role] = {};
+        _permData.permissions[role][key] = enabled;
+        // update card style
+        const safeKey = key.replace('.', '_');
+        const card = document.getElementById(`perm-card-${role}-${safeKey}`);
+        if (card) card.classList.toggle('enabled', enabled);
+        LS.toast(enabled ? 'Право включено' : 'Право отключено', 'success');
+      } catch(e) {
+        checkbox.checked = !enabled; // revert
+        LS.toast('Ошибка: ' + e.message, 'error');
+      } finally {
+        checkbox.disabled = false;
+      }
+    }
+
+    /* ════════════════════════════════════════════════
+       МАГАЗИН (Shop)
+    ════════════════════════════════════════════════ */
+    let _shopItems = [];
+    let _shopEditId = null;
+
+    async function loadShopAdmin() {
+      try {
+        const [stats, items] = await Promise.all([
+          LS.adminShopStats(),
+          LS.adminShopGetItems()
+        ]);
+        const topName = stats.topItems?.[0]?.name || '—';
+        document.getElementById('shop-stats-grid').innerHTML = `
+          <div class="stat-card" style="--stat-top:var(--violet)">
+            <div class="stat-card-icon" style="background:rgba(155,93,229,0.1)"><i data-lucide="shopping-bag" class="stat-icon"></i></div>
+            <div class="stat-val violet">${stats.activeItems}/${stats.totalItems}</div>
+            <div class="stat-label">Товаров</div>
+          </div>
+          <div class="stat-card" style="--stat-top:var(--cyan)">
+            <div class="stat-card-icon" style="background:rgba(6,214,224,0.1)"><i data-lucide="receipt" class="stat-icon"></i></div>
+            <div class="stat-val cyan">${stats.totalPurchases}</div>
+            <div class="stat-label">Покупок</div>
+          </div>
+          <div class="stat-card" style="--stat-top:var(--green)">
+            <div class="stat-card-icon" style="background:rgba(6,214,100,0.1)"><i data-lucide="coins" class="stat-icon"></i></div>
+            <div class="stat-val green">${stats.totalCoinsInCirculation}</div>
+            <div class="stat-label">Монет в обороте</div>
+          </div>
+          <div class="stat-card" style="--stat-top:var(--amber, #FFB347)">
+            <div class="stat-card-icon" style="background:rgba(255,179,71,0.1)"><i data-lucide="star" class="stat-icon"></i></div>
+            <div class="stat-val" style="color:var(--amber, #FFB347);font-size:1.1rem">${esc(topName)}</div>
+            <div class="stat-label">Топ товар</div>
+          </div>`;
+        _shopItems = items;
+        renderShopItems();
+        if (window.lucide) lucide.createIcons();
+      } catch(e) {
+        document.getElementById('shop-stats-grid').innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
+      }
+    }
+
+    function renderShopItems() {
+      const body = document.getElementById('shop-items-body');
+      if (!_shopItems.length) { body.innerHTML = '<tr><td colspan="7" class="empty">Нет товаров</td></tr>'; return; }
+      const typeLabels = { frame:'Рамка', title:'Титул', theme:'Тема', effect:'Эффект' };
+      body.innerHTML = _shopItems.map(it => `<tr>
+        <td>${it.id}</td>
+        <td><strong>${esc(it.name)}</strong></td>
+        <td><span class="mode-badge mode-practice">${typeLabels[it.type] || esc(it.type)}</span></td>
+        <td>${it.price} <i data-lucide="coins" style="width:12px;height:12px;vertical-align:-2px;color:var(--amber, #FFB347)"></i></td>
+        <td>${it.sold_count || 0}</td>
+        <td>
+          <label class="adm-toggle">
+            <input type="checkbox" ${it.is_active ? 'checked' : ''} onchange="shopAdminToggleActive(${it.id}, this.checked)" />
+            <span class="track"></span><span class="thumb"></span>
+          </label>
+        </td>
+        <td>
+          <button class="btn-edit-q" onclick="shopAdminEditItem(${it.id})">Ред.</button>
+          <button class="btn-del-q" onclick="shopAdminDeleteItem(${it.id})">Удалить</button>
+        </td>
+      </tr>`).join('');
+      if (window.lucide) lucide.createIcons();
+    }
+
+    function shopAdminCreateItem() {
+      _shopEditId = null;
+      document.getElementById('shop-form-title').textContent = 'Новый товар';
+      document.getElementById('shop-f-name').value = '';
+      document.getElementById('shop-f-type').value = 'frame';
+      document.getElementById('shop-f-price').value = '100';
+      document.getElementById('shop-f-desc').value = '';
+      document.getElementById('shop-f-icon').value = '';
+      document.getElementById('shop-f-data').value = '';
+      document.getElementById('shop-f-active').checked = true;
+      document.getElementById('shop-item-form').style.display = '';
+    }
+
+    function shopAdminEditItem(id) {
+      const it = _shopItems.find(i => i.id === id);
+      if (!it) return;
+      _shopEditId = id;
+      document.getElementById('shop-form-title').textContent = 'Редактировать товар #' + id;
+      document.getElementById('shop-f-name').value = it.name || '';
+      document.getElementById('shop-f-type').value = it.type || 'frame';
+      document.getElementById('shop-f-price').value = it.price ?? 100;
+      document.getElementById('shop-f-desc').value = it.description || '';
+      document.getElementById('shop-f-icon').value = it.icon || '';
+      document.getElementById('shop-f-data').value = it.data ? (typeof it.data === 'string' ? it.data : JSON.stringify(it.data)) : '';
+      document.getElementById('shop-f-active').checked = !!it.is_active;
+      document.getElementById('shop-item-form').style.display = '';
+    }
+
+    function shopAdminCancelForm() {
+      document.getElementById('shop-item-form').style.display = 'none';
+      _shopEditId = null;
+    }
+
+    let _shopSaving = false;
+    async function shopAdminSaveItem() {
+      if (_shopSaving) return;
+      _shopSaving = true;
+      const data = {
+        name: document.getElementById('shop-f-name').value.trim(),
+        type: document.getElementById('shop-f-type').value,
+        price: parseInt(document.getElementById('shop-f-price').value) || 0,
+        description: document.getElementById('shop-f-desc').value.trim(),
+        icon: document.getElementById('shop-f-icon').value.trim(),
+        data: document.getElementById('shop-f-data').value.trim() || null,
+        is_active: document.getElementById('shop-f-active').checked ? 1 : 0
+      };
+      if (!data.name) { LS.toast('Введите название', 'error'); return; }
+      try {
+        if (_shopEditId) {
+          await LS.adminShopUpdateItem(_shopEditId, data);
+          LS.toast('Товар обновлён', 'success');
+        } else {
+          await LS.adminShopCreateItem(data);
+          LS.toast('Товар создан', 'success');
+        }
+        shopAdminCancelForm();
+        shopInited = false;
+        loadShopAdmin();
+      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+      finally { _shopSaving = false; }
+    }
+
+    async function shopAdminDeleteItem(id) {
+      if (!await LS.confirm('Все покупки этого товара будут удалены.', { title: 'Удалить товар?', confirmText: 'Удалить', danger: true })) return;
+      try {
+        await LS.adminShopDeleteItem(id);
+        LS.toast('Товар удалён', 'success');
+        shopInited = false;
+        loadShopAdmin();
+      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+    }
+
+    async function shopAdminToggleActive(id, active) {
+      try {
+        await LS.adminShopUpdateItem(id, { is_active: active ? 1 : 0 });
+        LS.toast(active ? 'Товар активирован' : 'Товар деактивирован', 'success');
+      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+    }
+
+    let _shopSearchTimer = null;
+    async function shopSearchUser(q) {
+      clearTimeout(_shopSearchTimer);
+      const box = document.getElementById('shop-award-results');
+      if (q.length < 2) { box.classList.remove('open'); return; }
+      _shopSearchTimer = setTimeout(async () => {
+        try {
+          const r = await LS.adminGetUsers({ q, limit: 8 });
+          box.innerHTML = (r.users || []).map(u => `<div class="us-item" onclick="shopPickUser(${u.id}, '${esc(u.name || u.email)}')">
+            <span>${esc(u.name || u.email)}</span><span class="us-role">${u.role}</span>
+          </div>`).join('') || '<div class="us-item" style="color:var(--text-3)">Не найдено</div>';
+          box.classList.add('open');
+        } catch(e) { box.classList.remove('open'); }
+      }, 300);
+    }
+    function shopPickUser(id, name) {
+      document.getElementById('shop-award-uid').value = id;
+      document.getElementById('shop-award-user').value = name;
+      document.getElementById('shop-award-results').classList.remove('open');
+    }
+
+    let _coinsAwarding = false;
+    async function shopAdminAwardCoins() {
+      if (_coinsAwarding) return;
+      const userId = parseInt(document.getElementById('shop-award-uid').value);
+      const amount = parseInt(document.getElementById('shop-award-amount').value);
+      const reason = document.getElementById('shop-award-reason').value.trim();
+      if (!userId) { LS.toast('Выберите пользователя', 'error'); return; }
+      if (!amount || amount <= 0) { LS.toast('Введите количество монет', 'error'); return; }
+      _coinsAwarding = true;
+      try {
+        const r = await LS.adminShopAwardCoins({ userId, amount, reason });
+        LS.toast(`Начислено ${amount} монет. Баланс: ${r.coins}`, 'success');
+        document.getElementById('shop-award-uid').value = '';
+        document.getElementById('shop-award-user').value = '';
+        document.getElementById('shop-award-reason').value = '';
+      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+      finally { _coinsAwarding = false; }
+    }
+
+    /* ════════════════════════════════════════════════
+       ГЕЙМИФИКАЦИЯ (Gamification)
+    ════════════════════════════════════════════════ */
+    async function loadGamAdmin() {
+      try {
+        const stats = await LS.adminGamStats();
+        document.getElementById('gam-stats-grid').innerHTML = `
+          <div class="stat-card" style="--stat-top:var(--violet)">
+            <div class="stat-card-icon" style="background:rgba(155,93,229,0.1)"><i data-lucide="zap" class="stat-icon"></i></div>
+            <div class="stat-val violet">${stats.totalXP}</div>
+            <div class="stat-label">Суммарный XP</div>
+          </div>
+          <div class="stat-card" style="--stat-top:var(--cyan)">
+            <div class="stat-card-icon" style="background:rgba(6,214,224,0.1)"><i data-lucide="coins" class="stat-icon"></i></div>
+            <div class="stat-val cyan">${stats.totalCoins}</div>
+            <div class="stat-label">Суммарные монеты</div>
+          </div>
+          <div class="stat-card" style="--stat-top:var(--green)">
+            <div class="stat-card-icon" style="background:rgba(6,214,100,0.1)"><i data-lucide="bar-chart-3" class="stat-icon"></i></div>
+            <div class="stat-val green">${(stats.avgLevel ?? 0).toFixed(1)}</div>
+            <div class="stat-label">Средний уровень</div>
+          </div>
+          <div class="stat-card" style="--stat-top:var(--amber, #FFB347)">
+            <div class="stat-card-icon" style="background:rgba(255,179,71,0.1)"><i data-lucide="trophy" class="stat-icon"></i></div>
+            <div class="stat-val" style="color:var(--amber, #FFB347)">${stats.achievementCount}</div>
+            <div class="stat-label">Достижений выдано</div>
+          </div>
+          <div class="stat-card" style="--stat-top:#FF9F1C">
+            <div class="stat-card-icon" style="background:rgba(255,159,28,0.1)"><i data-lucide="shopping-bag" class="stat-icon"></i></div>
+            <div class="stat-val" style="color:#FF9F1C">${stats.totalPurchases || 0}</div>
+            <div class="stat-label">Покупок</div>
+          </div>`;
+
+        // Top-10
+        const topBody = document.getElementById('gam-top-body');
+        if (stats.topByXP?.length) {
+          topBody.innerHTML = stats.topByXP.slice(0, 10).map((u, i) => `<tr>
+            <td><strong>${i + 1}</strong></td>
+            <td>${esc(u.name || u.email || 'ID:' + (u.id || u.user_id))}</td>
+            <td><span style="color:var(--violet);font-weight:700">${u.xp}</span></td>
+            <td>${u.level}</td>
+            <td>${u.coins} <i data-lucide="coins" style="width:12px;height:12px;vertical-align:-2px;color:var(--amber, #FFB347)"></i></td>
+          </tr>`).join('');
+        } else {
+          topBody.innerHTML = '<tr><td colspan="5" class="empty">Нет данных</td></tr>';
+        }
+
+        // Recent XP
+        const XP_REASONS = {
+          'daily_activity': ['sun',          '#F59E0B', 'Ежедневная активность'],
+          'correct_answers':['check-circle', '#10B981', 'Правильные ответы'],
+          'test_complete':  ['file-text',    '#06B6D4', 'Тест завершён'],
+          'test_90+':       ['zap',          '#9B5DE5', 'Тест на 90%+'],
+          'test_perfect':   ['trophy',       '#F59E0B', 'Идеальный тест (100%)'],
+          'lab_experiment': ['atom',         '#06D6A0', 'Лабораторный эксперимент'],
+          'daily_goal':     ['target',       '#EF476F', 'Ежедневная цель выполнена'],
+          'Admin award':    ['crown',        '#9B5DE5', 'Начисление администратором'],
+        };
+        function fmtXPReason(reason) {
+          if (!reason) return '—';
+          const entry = XP_REASONS[reason];
+          if (entry) {
+            const [icon, color, label] = entry;
+            return `<span style="display:inline-flex;align-items:center;gap:5px"><span style="color:${color};display:inline-flex">${lsIcon(icon,14)}</span>${label}</span>`;
+          }
+          if (reason.startsWith('achievement:')) {
+            return `<span style="display:inline-flex;align-items:center;gap:5px"><span style="color:#F59E0B;display:inline-flex">${lsIcon('award',14)}</span>Достижение: ${esc(reason.slice(12))}</span>`;
+          }
+          if (reason.startsWith('Испытание:')) {
+            return `<span style="display:inline-flex;align-items:center;gap:5px"><span style="color:#EF476F;display:inline-flex">${lsIcon('swords',14)}</span>${esc(reason)}</span>`;
+          }
+          return esc(reason);
+        }
+
+        const logBody = document.getElementById('gam-log-body');
+        if (stats.recentXP?.length) {
+          logBody.innerHTML = stats.recentXP.slice(0, 20).map(e => `<tr>
+            <td style="font-size:0.78rem;color:var(--text-3)">${fmtDate(e.created_at || e.date)}</td>
+            <td>${esc(e.name || e.user_name || '—')}</td>
+            <td><span style="color:var(--violet);font-weight:700">+${e.amount}</span></td>
+            <td style="font-size:0.82rem;color:var(--text-2)">${fmtXPReason(e.reason)}</td>
+          </tr>`).join('');
+        } else {
+          logBody.innerHTML = '<tr><td colspan="4" class="empty">Нет данных</td></tr>';
+        }
+
+        // Purchases
+        const purchBody = document.getElementById('gam-purchases-body');
+        if (stats.recentPurchases?.length) {
+          purchBody.innerHTML = stats.recentPurchases.slice(0, 20).map(p => `<tr>
+            <td style="font-size:0.78rem;color:var(--text-3)">${fmtDate(p.purchased_at)}</td>
+            <td>${esc(p.user_name || '—')}</td>
+            <td style="font-weight:600">${esc(p.item_name || '—')}</td>
+            <td><span class="badge" style="font-size:0.7rem">${esc(p.type || '—')}</span></td>
+            <td style="color:var(--amber,#FFB347);font-weight:700">${p.price} <i data-lucide="coins" style="width:12px;height:12px;vertical-align:-2px"></i></td>
+          </tr>`).join('');
+        } else {
+          purchBody.innerHTML = '<tr><td colspan="5" class="empty">Нет покупок</td></tr>';
+        }
+
+        if (window.lucide) lucide.createIcons();
+      } catch(e) {
+        document.getElementById('gam-stats-grid').innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
+      }
+    }
+
+    let _gamSearchTimer = null;
+    async function gamSearchUser(q, prefix) {
+      clearTimeout(_gamSearchTimer);
+      const box = document.getElementById(prefix + '-results');
+      if (q.length < 2) { box.classList.remove('open'); return; }
+      _gamSearchTimer = setTimeout(async () => {
+        try {
+          const r = await LS.adminGetUsers({ q, limit: 8 });
+          box.innerHTML = (r.users || []).map(u => `<div class="us-item" onclick="gamPickUser(${u.id}, '${esc(u.name || u.email)}', '${prefix}')">
+            <span>${esc(u.name || u.email)}</span><span class="us-role">${u.role}</span>
+          </div>`).join('') || '<div class="us-item" style="color:var(--text-3)">Не найдено</div>';
+          box.classList.add('open');
+        } catch(e) { box.classList.remove('open'); }
+      }, 300);
+    }
+    function gamPickUser(id, name, prefix) {
+      document.getElementById(prefix + '-uid').value = id;
+      document.getElementById(prefix + '-user').value = name;
+      document.getElementById(prefix + '-results').classList.remove('open');
+    }
+
+    let _gamAwarding = false;
+    async function gamAdminAward() {
+      if (_gamAwarding) return;
+      const userId = parseInt(document.getElementById('gam-award-uid').value);
+      const xp = parseInt(document.getElementById('gam-award-xp').value) || 0;
+      const coins = parseInt(document.getElementById('gam-award-coins').value) || 0;
+      const reason = document.getElementById('gam-award-reason').value.trim();
+      if (!userId) { LS.toast('Выберите пользователя', 'error'); return; }
+      if (!xp && !coins) { LS.toast('Введите XP или монеты', 'error'); return; }
+      _gamAwarding = true;
+      try {
+        const r = await LS.adminGamAward({ userId, xp, coins, reason });
+        LS.toast(`Начислено! XP: ${r.xp}, Уровень: ${r.level}, Монеты: ${r.coins}`, 'success');
+        document.getElementById('gam-award-uid').value = '';
+        document.getElementById('gam-award-user').value = '';
+        document.getElementById('gam-award-reason').value = '';
+        gamInited = false;
+        loadGamAdmin();
+      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+      finally { _gamAwarding = false; }
+    }
+
+    async function gamAdminReset() {
+      const userId = parseInt(document.getElementById('gam-reset-uid').value);
+      const userName = document.getElementById('gam-reset-user').value;
+      if (!userId) { LS.toast('Выберите пользователя', 'error'); return; }
+      if (!await LS.confirm(`ВСЕ XP, монеты и достижения «${userName}» будут удалены безвозвратно.`, { title: 'Сбросить прогресс?', confirmText: 'Сбросить', danger: true })) return;
+      try {
+        await LS.adminGamReset({ userId });
+        LS.toast('Прогресс сброшен', 'success');
+        document.getElementById('gam-reset-uid').value = '';
+        document.getElementById('gam-reset-user').value = '';
+        gamInited = false;
+        loadGamAdmin();
+      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+    }
+
+    /* ════════════════════════════════════════════════
+       ШАБЛОНЫ (Templates)
+    ════════════════════════════════════════════════ */
+    async function loadTplAdmin() {
+      try {
+        const [courses, lessons] = await Promise.all([
+          LS.getCourseTemplates().catch(() => []),
+          LS.getLessonTemplates().catch(() => [])
+        ]);
+        renderTplTable('tpl-course-body', courses, 'courses');
+        renderTplTable('tpl-lesson-body', lessons, 'lessons');
+        if (window.lucide) lucide.createIcons();
+      } catch(e) {
+        document.getElementById('tpl-course-body').innerHTML = `<tr><td colspan="7" class="error">Ошибка: ${esc(e.message)}</td></tr>`;
+      }
+    }
+
+    function renderTplTable(bodyId, items, type) {
+      const body = document.getElementById(bodyId);
+      if (!items || !items.length) {
+        body.innerHTML = '<tr><td colspan="7" class="empty">Нет шаблонов</td></tr>';
+        return;
+      }
+      body.innerHTML = items.map(t => `<tr>
+        <td>${t.id}</td>
+        <td><strong>${esc(t.name || t.title || '—')}</strong></td>
+        <td>${esc(t.subject || '—')}</td>
+        <td>${esc(t.category || '—')}</td>
+        <td>${esc(t.author_name || t.author || '—')}</td>
+        <td>
+          <label class="adm-toggle">
+            <input type="checkbox" ${t.is_public ? 'checked' : ''} onchange="tplTogglePublic('${type}', ${t.id}, this.checked)" />
+            <span class="track"></span><span class="thumb"></span>
+          </label>
+        </td>
+        <td>
+          <button class="btn-del-q" onclick="tplDelete('${type}', ${t.id})">Удалить</button>
+        </td>
+      </tr>`).join('');
+    }
+
+    async function tplTogglePublic(type, id, isPublic) {
+      try {
+        const endpoint = type === 'courses' ? '/api/templates/courses/' : '/api/templates/lessons/';
+        await LS.api(endpoint + id, { method: 'PUT', body: JSON.stringify({ is_public: isPublic ? 1 : 0 }) });
+        LS.toast(isPublic ? 'Шаблон опубликован' : 'Шаблон скрыт', 'success');
+      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+    }
+
+    async function tplDelete(type, id) {
+      if (!confirm('Удалить шаблон #' + id + '?')) return;
+      try {
+        if (type === 'courses') await LS.deleteCourseTemplate(id);
+        else await LS.deleteLessonTemplate(id);
+        LS.toast('Шаблон удалён', 'success');
+        tplInited = false;
+        loadTplAdmin();
+      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+    }
+
+    /* ════════════════════════════════════════════════
+       СИМУЛЯЦИИ
+    ════════════════════════════════════════════════ */
+
+    // Full list of available (non-null id) sims mirrored from /lab
+    const ADMIN_SIMS = [
+      { id: 'graph',          cat: 'Математика', title: 'График функции' },
+      { id: 'graphtransform', cat: 'Математика', title: 'Трансформации графиков' },
+      { id: 'geometry',       cat: 'Математика', title: 'Планиметрия' },
+      { id: 'triangle',       cat: 'Математика', title: 'Геометрия треугольника' },
+      { id: 'quadratic',      cat: 'Математика', title: 'Корни квадратного уравнения' },
+      { id: 'stereo',         cat: 'Математика', title: 'Стереометрия 3D' },
+      { id: 'probability',    cat: 'Математика', title: 'Теория вероятностей' },
+      { id: 'trigcircle',     cat: 'Математика', title: 'Тригонометрическая окружность' },
+      { id: 'normaldist',     cat: 'Математика', title: 'Нормальное распределение' },
+      { id: 'projectile',     cat: 'Физика',     title: 'Бросок тела' },
+      { id: 'pendulum',       cat: 'Физика',     title: 'Маятник' },
+      { id: 'collision',      cat: 'Физика',     title: 'Столкновение шаров' },
+      { id: 'magnetic',       cat: 'Физика',     title: 'Магнитное поле токов' },
+      { id: 'circuit',        cat: 'Физика',     title: 'Электрические цепи' },
+      { id: 'coulomb',        cat: 'Физика',     title: 'Закон Кулона' },
+      { id: 'hydrostatics',   cat: 'Физика',     title: 'Гидростатика' },
+      { id: 'dynamics',       cat: 'Физика',     title: 'Динамика' },
+      { id: 'thinlens',       cat: 'Физика',     title: 'Тонкая линза' },
+      { id: 'refraction',     cat: 'Физика',     title: 'Преломление света' },
+      { id: 'mirrors',        cat: 'Физика',     title: 'Зеркала' },
+      { id: 'isoprocess',     cat: 'Физика',     title: 'Изопроцессы' },
+      { id: 'waves',          cat: 'Физика',     title: 'Волны и звук' },
+      { id: 'molphys',        cat: 'Химия',      title: 'Молекулярная физика' },
+      { id: 'chemistry',      cat: 'Химия',      title: 'Химические реакции' },
+      { id: 'equilibrium',    cat: 'Химия',      title: 'Химическое равновесие' },
+      { id: 'electrolysis',   cat: 'Химия',      title: 'Электролиз' },
+      { id: 'bohratom',       cat: 'Химия',      title: 'Атом Бора' },
+      { id: 'orbitals',       cat: 'Химия',      title: 'Молекулярные орбитали' },
+      { id: 'titration',      cat: 'Химия',      title: 'pH и кривая титрования' },
+      { id: 'chemsandbox',    cat: 'Химия',      title: 'Химическая песочница' },
+      { id: 'crystal',        cat: 'Химия',      title: 'Кристаллическая решётка' },
+      { id: 'celldivision',   cat: 'Биология',   title: 'Деление клетки' },
+      { id: 'photosynthesis', cat: 'Биология',   title: 'Фотосинтез и дыхание' },
+      { id: 'angrybirds',     cat: 'Игры',       title: 'Angry Birds Physics' },
+    ];
+
+    let _simsSettings = { module_disabled: false, disabled_ids: [] };
+
+    async function loadSimsAdmin() {
+      try {
+        const data = await LS.api('/api/settings/sims');
+        _simsSettings = data;
+        _renderSimsAdmin();
+      } catch(e) { LS.toast('Ошибка загрузки настроек: ' + e.message, 'error'); }
+    }
+
+    function _renderSimsAdmin() {
+      // master toggle
+      const masterChk = document.getElementById('sims-master-chk');
+      if (masterChk) masterChk.checked = !_simsSettings.module_disabled;
+
+      // per-sim cards
+      const grid = document.getElementById('sims-grid');
+      const dis  = new Set(_simsSettings.disabled_ids || []);
+      // group by category
+      const byCat = {};
+      ADMIN_SIMS.forEach(s => { (byCat[s.cat] = byCat[s.cat] || []).push(s); });
+
+      let html = '';
+      Object.entries(byCat).forEach(([cat, sims]) => {
+        html += `<div style="grid-column:1/-1;font-size:.72rem;font-weight:800;text-transform:uppercase;letter-spacing:.07em;color:var(--text-3);margin-top:12px;margin-bottom:2px">${esc(cat)}</div>`;
+        sims.forEach(s => {
+          const enabled = !dis.has(s.id);
+          html += `<div class="perm-card${enabled ? ' enabled' : ''}" id="simcard-${s.id}">
+            <div class="perm-info">
+              <div class="perm-label">${esc(s.title)}</div>
+              <div class="perm-desc" style="font-size:11px;margin-top:2px;opacity:.7">${esc(s.id)}</div>
+            </div>
+            <label class="perm-toggle" title="${enabled ? 'Отключить' : 'Включить'}">
+              <input type="checkbox" ${enabled ? 'checked' : ''} onchange="simToggleOne('${s.id}', this.checked)" />
+              <span class="perm-track"></span>
+              <span class="perm-thumb"></span>
+            </label>
+          </div>`;
+        });
+      });
+      grid.innerHTML = html;
+      if (window.lucide) lucide.createIcons();
+    }
+
+    async function simsMasterToggle(checked) {
+      // checked = module enabled; disabled = !checked
+      try {
+        await LS.api('/api/settings/sims', { method: 'PUT', body: JSON.stringify({ module_disabled: !checked }) });
+        _simsSettings.module_disabled = !checked;
+        LS.toast(checked ? 'Модуль симуляций включён' : 'Модуль симуляций отключён', checked ? 'success' : 'warning');
+      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+    }
+
+    async function simToggleOne(simId, enabled) {
+      const dis = new Set(_simsSettings.disabled_ids || []);
+      if (enabled) dis.delete(simId); else dis.add(simId);
+      const disabled_ids = [...dis];
+      try {
+        await LS.api('/api/settings/sims', { method: 'PUT', body: JSON.stringify({ disabled_ids }) });
+        _simsSettings.disabled_ids = disabled_ids;
+        // update card style
+        const card = document.getElementById('simcard-' + simId);
+        if (card) card.classList.toggle('enabled', enabled);
+        LS.toast(enabled ? `«${simId}» включена` : `«${simId}» отключена`, enabled ? 'success' : 'warning');
+      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+    }
+
+    /* ─── Games features admin ─── */
+    const GAME_FEATURES = [
+      { key: 'hangman',       label: 'Виселица',        desc: 'Игра «Угадай слово» — отгадывание терминов по буквам',              icon: 'gamepad-2'      },
+      { key: 'crossword',     label: 'Кроссворд',       desc: 'Кроссворд из терминов — генерируется автоматически по темам',       icon: 'grid-3x3'       },
+      { key: 'pet',           label: 'Питомец',          desc: 'Виртуальный питомец, отражающий активность ученика',                icon: 'heart'          },
+      { key: 'red_book',      label: 'Красная книга',   desc: 'Интерактивная Красная книга РБ: виды, биомы, пищевые сети, квесты', icon: 'leaf'           },
+      { key: 'collection',    label: 'Коллекция',        desc: 'Коллекция карточек и достижений — игровой прогресс ученика',        icon: 'layers'         },
+      { key: 'flashcards',    label: 'Флеш-карточки',   desc: 'Карточки для запоминания терминов и понятий методом интервальных повторений', icon: 'square-stack'   },
+      { key: 'knowledge_map', label: 'Карта знаний',    desc: 'Визуальная карта тем и связей между биологическими понятиями',      icon: 'share-2'        },
+      { key: 'board',         label: 'Доска',             desc: 'Классная доска с объявлениями, постами и обсуждениями',             icon: 'layout-dashboard'},
+      { key: 'biochem',       label: 'Биохимия',          desc: 'Молекулярный редактор, задачи на построение молекул и реакции',     icon: 'flask-conical'  },
+      { key: 'live_quiz',     label: 'Живая викторина',  desc: 'Синхронная викторина в реальном времени для всего класса',          icon: 'radio'          },
+    ];
+
+    async function loadGamesAdmin() {
+      const grid = document.getElementById('games-features-grid');
+      try {
+        const features = await LS.api('/api/admin/features');
+        grid.innerHTML = '';
+        for (const f of GAME_FEATURES) {
+          const enabled = features[f.key] !== false;
+          const card = document.createElement('div');
+          card.className = 'perm-card' + (enabled ? ' enabled' : '');
+          card.innerHTML = `
+            <div class="perm-info">
+              <div class="perm-label"><i data-lucide="${f.icon}" style="width:14px;height:14px;vertical-align:-2px;margin-right:6px"></i>${f.label}</div>
+              <div class="perm-desc">${f.desc}</div>
+            </div>
+            <label class="perm-toggle">
+              <input type="checkbox" ${enabled ? 'checked' : ''} onchange="toggleGameFeature('${f.key}', this.checked, this)" />
+              <span class="perm-track"></span>
+              <span class="perm-thumb"></span>
+            </label>`;
+          grid.appendChild(card);
+        }
+        if (window.lucide) lucide.createIcons();
+      } catch(e) {
+        grid.innerHTML = '<div class="error">Ошибка загрузки</div>';
+      }
+    }
+
+    async function toggleGameFeature(key, enabled, checkbox) {
+      try {
+        await LS.api('/api/admin/features', {
+          method: 'PATCH',
+          body: JSON.stringify({ [key]: enabled }),
+        });
+        const card = checkbox.closest('.perm-card');
+        if (card) card.classList.toggle('enabled', enabled);
+        LS.toast(enabled ? 'Функция включена' : 'Функция отключена', 'success');
+      } catch(e) {
+        checkbox.checked = !enabled;
+        LS.toast('Ошибка: ' + e.message, 'error');
+      }
+    }
+
+    /* ─── Free-student module features ─── */
+    const FS_FEATURES = [
+      { key: 'gamification', label: 'Геймификация',   desc: 'XP, уровни, достижения, монеты, стрики, магазин', icon: 'trophy' },
+      { key: 'hangman',      label: 'Виселица',        desc: 'Игра «Угадай слово» — отгадывание терминов по буквам', icon: 'gamepad-2' },
+      { key: 'crossword',    label: 'Кроссворд',       desc: 'Кроссворд из терминов — генерируется автоматически', icon: 'grid-3x3' },
+      { key: 'pet',          label: 'Питомец',          desc: 'Виртуальный питомец, отражающий активность ученика', icon: 'heart' },
+      { key: 'red_book',     label: 'Красная книга',   desc: 'Интерактивная Красная книга РБ: виды, биомы, квесты', icon: 'leaf' },
+      { key: 'collection',   label: 'Коллекция',        desc: 'Коллекция карточек и игровой прогресс ученика', icon: 'layers' },
+      { key: 'lab',          label: 'Лаборатория',      desc: 'Виртуальные симуляции и интерактивные опыты', icon: 'flask-conical' },
+      { key: 'knowledge_map',label: 'Карта знаний',    desc: 'Визуальная карта тем и связей между понятиями', icon: 'map' },
+      { key: 'flashcards',   label: 'Флеш-карточки',   desc: 'Карточки для повторения терминов и понятий', icon: 'square-stack' },
+      { key: 'board',        label: 'Доска',             desc: 'Классная доска с объявлениями и постами', icon: 'layout-dashboard' },
+      { key: 'biochem',      label: 'Биохимия',          desc: 'Молекулярный редактор, задачи на построение молекул и реакции', icon: 'flask-conical' },
+      { key: 'live_quiz',    label: 'Живая викторина',  desc: 'Синхронная викторина в реальном времени для всего класса', icon: 'radio' },
+    ];
+
+    async function loadFsFeatures() {
+      const grid = document.getElementById('fs-features-grid');
+      try {
+        const features = await LS.api('/api/admin/free-student-features');
+        grid.innerHTML = '';
+        for (const f of FS_FEATURES) {
+          const enabled = features[f.key] !== false;
+          const card = document.createElement('div');
+          card.className = 'perm-card' + (enabled ? ' enabled' : '');
+          card.innerHTML = `
+            <div class="perm-info">
+              <div class="perm-label"><i data-lucide="${f.icon}" style="width:14px;height:14px;vertical-align:-2px;margin-right:6px"></i>${f.label}</div>
+              <div class="perm-desc">${f.desc}</div>
+            </div>
+            <label class="perm-toggle">
+              <input type="checkbox" ${enabled ? 'checked' : ''} onchange="toggleFsFeature('${f.key}', this.checked, this)" />
+              <span class="perm-track"></span>
+              <span class="perm-thumb"></span>
+            </label>`;
+          grid.appendChild(card);
+        }
+        if (window.lucide) lucide.createIcons();
+      } catch(e) {
+        grid.innerHTML = '<div class="error">Ошибка загрузки</div>';
+      }
+    }
+
+    async function toggleFsFeature(key, enabled, checkbox) {
+      try {
+        await LS.api('/api/admin/free-student-features', {
+          method: 'PATCH',
+          body: JSON.stringify({ [key]: enabled }),
+        });
+        const card = checkbox.closest('.perm-card');
+        if (card) card.classList.toggle('enabled', enabled);
+        LS.toast(enabled ? 'Модуль включён' : 'Модуль отключён', 'success');
+      } catch(e) {
+        checkbox.checked = !enabled;
+        LS.toast('Ошибка: ' + e.message, 'error');
+      }
+    }
+
+    /* ─── Submission log ─── */
+    const SL_STATUSES = { new:'На проверке', reviewed:'Проверено', accepted:'Принято', revision:'На доработке', resubmitted:'Повторно' };
+
+    async function loadSubmissionLog() {
+      const el = document.getElementById('sublog-list');
+      const countEl = document.getElementById('sublog-count');
+      const classId = document.getElementById('sublog-class-filter').value;
+      el.innerHTML = '<div class="spinner"></div>';
+      countEl.textContent = '';
+      try {
+        const url = classId ? `/api/submissions/log?class_id=${classId}` : '/api/submissions/log';
+        const rows = await LS.api(url);
+
+        // Populate class filter on first load
+        const sel = document.getElementById('sublog-class-filter');
+        if (sel.options.length <= 1 && rows.length) {
+          const classMap = new Map();
+          rows.forEach(r => { if (r.class_id && r.class_name) classMap.set(r.class_id, r.class_name); });
+          classMap.forEach((name, id) => {
+            const opt = document.createElement('option');
+            opt.value = id; opt.textContent = name;
+            sel.appendChild(opt);
+          });
+        }
+
+        countEl.textContent = rows.length ? `${rows.length} записей` : '';
+
+        if (!rows.length) {
+          el.innerHTML = `<div class="sl-empty">
+            <div class="sl-empty-icon"><i data-lucide="inbox" style="width:48px;height:48px"></i></div>
+            Удалённых работ нет
+          </div>`;
+          if (window.lucide) lucide.createIcons({ nodes: [el] });
+          return;
+        }
+
+        const ROLE_LABELS = { admin: 'Админ', teacher: 'Учитель', student: 'Ученик' };
+
+        el.innerHTML = `<div class="sl-wrap"><table class="sl-table">
+          <thead><tr>
+            <th>Дата</th>
+            <th>Ученик</th>
+            <th>Файл</th>
+            <th>Задание</th>
+            <th>Класс</th>
+            <th>Статус</th>
+            <th>Оценка</th>
+            <th>Удалил</th>
+          </tr></thead>
+          <tbody>${rows.map(r => {
+            const dt = r.deleted_at ? new Date(r.deleted_at.includes('T') ? r.deleted_at : r.deleted_at.replace(' ','T')+'Z') : null;
+            const dateStr = dt ? dt.toLocaleDateString('ru',{day:'numeric',month:'short'}) + ' ' + dt.toLocaleTimeString('ru',{hour:'2-digit',minute:'2-digit'}) : '—';
+            const initials = (r.student_name || '?').split(' ').slice(0,2).map(w => w[0]?.toUpperCase() || '').join('');
+            const st = r.status || 'new';
+            const gradeVal = r.grade != null ? r.grade : null;
+            const gradeCls = gradeVal != null ? (gradeVal >= 80 ? 'sl-grade-hi' : gradeVal >= 50 ? 'sl-grade-mid' : 'sl-grade-lo') : 'sl-grade-none';
+            const roleCls = 'sl-role-' + (r.deleted_by_role || 'student');
+            return `<tr>
+              <td><span class="sl-date">${dateStr}</span></td>
+              <td><span class="sl-student"><span class="sl-student-avatar">${initials}</span>${esc(r.student_name || '—')}</span></td>
+              <td><span class="sl-file" title="${esc(r.original_name || '')}">${esc(r.original_name || '—')}</span></td>
+              <td><span class="sl-assignment">${esc(r.assignment_title || '—')}</span></td>
+              <td><span class="sl-class">${esc(r.class_name || '—')}</span></td>
+              <td><span class="sl-status sl-status-${st}">${SL_STATUSES[st] || st}</span></td>
+              <td><span class="sl-grade ${gradeCls}">${gradeVal != null ? gradeVal : '—'}</span></td>
+              <td><span class="sl-deleted-by">${esc(r.deleted_by_name || '—')} <span class="sl-role-badge ${roleCls}">${ROLE_LABELS[r.deleted_by_role] || r.deleted_by_role || '?'}</span></span></td>
+            </tr>`;
+          }).join('')}</tbody>
+        </table></div>`;
+        document.getElementById('btn-clear-sublog').style.display = '';
+      } catch (e) {
+        el.innerHTML = `<div class="sl-empty" style="color:#c0306a">Ошибка: ${esc(e.message)}</div>`;
+      }
+    }
+
+    async function clearSubmissionLog() {
+      if (!await LS.confirm('Очистить весь журнал удалённых работ? Это действие необратимо.', { title: 'Очистка журнала', confirmText: 'Очистить', danger: true })) return;
+      try {
+        await LS.api('/api/submissions/log', { method: 'DELETE' });
+        document.getElementById('btn-clear-sublog').style.display = 'none';
+        document.getElementById('sublog-count').textContent = '';
+        document.getElementById('sublog-list').innerHTML = `<div class="sl-empty">
+          <div class="sl-empty-icon"><i data-lucide="inbox" style="width:48px;height:48px"></i></div>
+          Журнал очищен
+        </div>`;
+        if (window.lucide) lucide.createIcons({ nodes: [document.getElementById('sublog-list')] });
+        LS.toast('Журнал очищен', 'success');
+      } catch (e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+    }
+
+    /* ═══ TOPICS ═══════════════════════════════════════════════════════ */
+    let _topicsSubjects = [];
+    async function loadTopicSubjects() {
+      if (_topicsSubjects.length) return;
+      try {
+        _topicsSubjects = await LS.getSubjects();
+        const sel = document.getElementById('topics-subj-filter');
+        sel.innerHTML = _topicsSubjects.map(s => `<option value="${s.id}">${esc(s.name)}</option>`).join('');
+      } catch {}
+    }
+    async function loadTopics() {
+      await loadTopicSubjects();
+      const subjId = document.getElementById('topics-subj-filter').value;
+      const el = document.getElementById('topics-list');
+      el.innerHTML = LS.skeleton(4, 'row');
+      try {
+        const rows = await LS.api(`/api/admin/topics?subject_id=${subjId}`);
+        document.getElementById('topics-count').textContent = rows.length + ' тем';
+        if (!rows.length) { el.innerHTML = '<div style="padding:32px;text-align:center;color:var(--text-3)">Тем нет</div>'; return; }
+        el.innerHTML = '<div style="display:flex;flex-direction:column;gap:6px">' + rows.map(t => `
+          <div class="adm-panel" style="padding:12px 18px;margin:0;display:flex;align-items:center;gap:14px">
+            <span style="font-size:0.75rem;color:var(--text-3);font-weight:700;min-width:28px">#${t.order_index}</span>
+            <span style="flex:1;font-weight:600">${esc(t.name)}</span>
+            <span style="font-size:0.78rem;color:var(--text-3)">${t.question_count} вопр.</span>
+            <button class="adm-btn adm-btn-small" style="background:var(--border-h);color:var(--text-2);padding:5px 12px" onclick="renameTopic(${t.id},'${esc(t.name).replace(/'/g,"\\'")}')">
+              <i data-lucide="pencil" style="width:12px;height:12px;vertical-align:-1px"></i>
+            </button>
+            <button class="adm-btn adm-btn-small" style="background:rgba(241,91,181,0.1);color:var(--pink);padding:5px 12px" onclick="deleteTopic(${t.id},'${esc(t.name).replace(/'/g,"\\'")}',${t.question_count})">
+              <i data-lucide="trash-2" style="width:12px;height:12px;vertical-align:-1px"></i>
+            </button>
+          </div>`).join('') + '</div>';
+        if (window.lucide) lucide.createIcons({ nodes: [el] });
+      } catch (e) { el.innerHTML = `<div style="color:var(--pink)">${esc(e.message)}</div>`; }
+    }
+    function showAddTopic() { document.getElementById('topics-add-row').style.display = ''; document.getElementById('topics-new-name').focus(); }
+    async function createTopic() {
+      const name = document.getElementById('topics-new-name').value.trim();
+      if (!name) return;
+      const subjId = document.getElementById('topics-subj-filter').value;
+      try {
+        await LS.api('/api/admin/topics', { method:'POST', body: JSON.stringify({ subject_id: subjId, name }) });
+        document.getElementById('topics-new-name').value = '';
+        document.getElementById('topics-add-row').style.display = 'none';
+        LS.toast('Тема создана', 'success');
+        loadTopics();
+      } catch (e) { LS.toast(e.message, 'error'); }
+    }
+    async function renameTopic(id, oldName) {
+      const name = prompt('Новое название темы:', oldName);
+      if (!name || name === oldName) return;
+      try {
+        await LS.api(`/api/admin/topics/${id}`, { method:'PATCH', body: JSON.stringify({ name }) });
+        LS.toast('Тема переименована', 'success');
+        loadTopics();
+      } catch (e) { LS.toast(e.message, 'error'); }
+    }
+    async function deleteTopic(id, name, qcount) {
+      if (qcount > 0) { LS.toast(`Нельзя удалить тему с ${qcount} вопросами`, 'warn'); return; }
+      if (!await LS.confirm(`Удалить тему "${name}"?`, { danger: true })) return;
+      try {
+        await LS.api(`/api/admin/topics/${id}`, { method:'DELETE' });
+        LS.toast('Тема удалена', 'success');
+        loadTopics();
+      } catch (e) { LS.toast(e.message, 'error'); }
+    }
+
+    /* ═══ BROADCAST ═════════════════════════════════════════════════════ */
+    async function sendBroadcast() {
+      const message = document.getElementById('bc-message').value.trim();
+      if (!message) { LS.toast('Введите сообщение', 'warn'); return; }
+      const role = document.getElementById('bc-role').value;
+      const link = document.getElementById('bc-link').value.trim() || null;
+      try {
+        const r = await LS.api('/api/admin/broadcast', { method:'POST', body: JSON.stringify({ message, role, link }) });
+        document.getElementById('bc-result').textContent = `Отправлено ${r.sent} пользователям`;
+        document.getElementById('bc-message').value = '';
+        LS.toast(`Уведомление отправлено ${r.sent} пользователям`, 'success');
+      } catch (e) { LS.toast(e.message, 'error'); }
+    }
+
+    /* ═══ AUDIT LOG ════════════════════════════════════════════════════ */
+    async function loadAuditLog() {
+      const el = document.getElementById('audit-list');
+      el.innerHTML = LS.skeleton(5, 'row');
+      try {
+        const rows = await LS.api('/api/admin/audit-log?limit=200');
+        if (!rows.length) { el.innerHTML = '<div style="padding:32px;text-align:center;color:var(--text-3)">Журнал пуст</div>'; return; }
+        const ACTION_LABELS = {
+          'user.role_change': 'Смена роли', 'user.edit': 'Редактирование', 'user.ban': 'Блокировка',
+          'user.unban': 'Разблокировка', 'user.delete': 'Удаление', 'user.clear_sessions': 'Очистка истории',
+          'features.update': 'Фичи обновлены', 'topic.create': 'Создание темы', 'topic.update': 'Редакт. темы',
+          'topic.delete': 'Удаление темы', 'broadcast': 'Рассылка',
+        };
+        const ACTION_COLORS = {
+          'user.delete': 'var(--pink)', 'user.ban': 'var(--pink)', 'user.clear_sessions': 'var(--amber)',
+        };
+        el.innerHTML = `<div class="sl-wrap"><table class="sl-table">
+          <thead><tr><th>Дата</th><th>Админ</th><th>Действие</th><th>Цель</th><th>Детали</th><th>IP</th></tr></thead>
+          <tbody>${rows.map(r => {
+            const dt = new Date(r.created_at);
+            const ds = dt.toLocaleDateString('ru',{day:'numeric',month:'short'}) + ' ' + dt.toLocaleTimeString('ru',{hour:'2-digit',minute:'2-digit'});
+            const acol = ACTION_COLORS[r.action] || 'var(--violet)';
+            return `<tr>
+              <td><span class="sl-date">${ds}</span></td>
+              <td>${esc(r.admin_name || '—')}</td>
+              <td><span style="color:${acol};font-weight:700;font-size:0.82rem">${ACTION_LABELS[r.action] || r.action}</span></td>
+              <td style="font-size:0.82rem;color:var(--text-3)">${esc(r.target || '')}</td>
+              <td style="font-size:0.82rem;max-width:300px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap" title="${esc(r.detail || '')}">${esc(r.detail || '')}</td>
+              <td style="font-size:0.78rem;color:var(--text-3);font-family:monospace">${esc(r.ip || '')}</td>
+            </tr>`;
+          }).join('')}</tbody></table></div>`;
+      } catch (e) { el.innerHTML = `<div style="color:var(--pink)">${esc(e.message)}</div>`; }
+    }
+    async function clearAuditLog() {
+      if (!await LS.confirm('Очистить весь аудит-лог?', { danger: true })) return;
+      try {
+        await LS.api('/api/admin/audit-log', { method:'DELETE' });
+        document.getElementById('audit-list').innerHTML = '<div style="padding:32px;text-align:center;color:var(--text-3)">Журнал очищен</div>';
+        LS.toast('Журнал очищен', 'success');
+      } catch (e) { LS.toast(e.message, 'error'); }
+    }
+
+    /* ═══ ERROR LOG ════════════════════════════════════════════════════ */
+    async function loadErrorLog() {
+      const el = document.getElementById('errors-list');
+      el.innerHTML = LS.skeleton(3, 'row');
+      try {
+        const rows = await LS.api('/api/admin/error-log?limit=200');
+        if (!rows.length) { el.innerHTML = '<div style="padding:32px;text-align:center;color:var(--text-3);font-size:0.88rem">Ошибок нет</div>'; return; }
+        el.innerHTML = rows.map(r => {
+          const dt = new Date(r.created_at);
+          const ds = dt.toLocaleDateString('ru',{day:'numeric',month:'short'}) + ' ' + dt.toLocaleTimeString('ru',{hour:'2-digit',minute:'2-digit'});
+          return `<div class="adm-panel" style="padding:14px 18px;margin-bottom:8px;border-left:3px solid var(--pink)">
+            <div style="display:flex;align-items:center;gap:10px;margin-bottom:6px">
+              <span style="font-size:0.78rem;color:var(--pink);font-weight:700">${r.method || ''} ${esc(r.route || '')}</span>
+              <span style="font-size:0.72rem;color:var(--text-3);margin-left:auto">${ds}</span>
+              ${r.user_id ? `<span style="font-size:0.72rem;color:var(--text-3)">user:${r.user_id}</span>` : ''}
+            </div>
+            <div style="font-size:0.88rem;font-weight:600;color:var(--text);margin-bottom:4px">${esc(r.message)}</div>
+            ${r.stack ? `<details><summary style="font-size:0.75rem;color:var(--text-3);cursor:pointer">Stack trace</summary><pre style="font-size:0.72rem;color:var(--text-3);white-space:pre-wrap;max-height:200px;overflow:auto;margin-top:6px;padding:8px;background:rgba(0,0,0,0.02);border-radius:8px">${esc(r.stack)}</pre></details>` : ''}
+          </div>`;
+        }).join('');
+      } catch (e) { el.innerHTML = `<div style="color:var(--pink)">${esc(e.message)}</div>`; }
+    }
+    async function clearErrorLog() {
+      if (!await LS.confirm('Очистить журнал ошибок?', { danger: true })) return;
+      try {
+        await LS.api('/api/admin/error-log', { method:'DELETE' });
+        document.getElementById('errors-list').innerHTML = '<div style="padding:32px;text-align:center;color:var(--text-3)">Журнал очищен</div>';
+        LS.toast('Журнал очищен', 'success');
+      } catch (e) { LS.toast(e.message, 'error'); }
+    }
+
+    /* ═══ SYSTEM HEALTH ════════════════════════════════════════════════ */
+    async function loadHealth() {
+      const el = document.getElementById('health-content');
+      el.innerHTML = LS.skeleton(3, 'row');
+      try {
+        const h = await LS.api('/api/admin/health');
+        const fmtBytes = b => b > 1e9 ? (b/1e9).toFixed(1)+' GB' : b > 1e6 ? (b/1e6).toFixed(1)+' MB' : (b/1e3).toFixed(0)+' KB';
+        const fmtUp = s => { const d=Math.floor(s/86400), hr=Math.floor(s%86400/3600), m=Math.floor(s%3600/60); return d>0?`${d}d ${hr}h`:hr>0?`${hr}h ${m}m`:`${m}m`; };
+        el.innerHTML = `
+          <div style="display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px;margin-bottom:24px">
+            <div class="adm-panel" style="padding:18px;margin:0;text-align:center">
+              <div style="font-size:1.3rem;font-weight:800;font-family:'Unbounded',sans-serif;color:var(--green)">${fmtUp(h.uptime)}</div>
+              <div style="font-size:0.72rem;color:var(--text-3);font-weight:700;text-transform:uppercase;margin-top:4px">Uptime</div>
+            </div>
+            <div class="adm-panel" style="padding:18px;margin:0;text-align:center">
+              <div style="font-size:1.3rem;font-weight:800;font-family:'Unbounded',sans-serif;color:var(--violet)">${fmtBytes(h.db.sizeBytes)}</div>
+              <div style="font-size:0.72rem;color:var(--text-3);font-weight:700;text-transform:uppercase;margin-top:4px">База данных</div>
+            </div>
+            <div class="adm-panel" style="padding:18px;margin:0;text-align:center">
+              <div style="font-size:1.3rem;font-weight:800;font-family:'Unbounded',sans-serif">${fmtBytes(h.uploads.sizeBytes)}</div>
+              <div style="font-size:0.72rem;color:var(--text-3);font-weight:700;text-transform:uppercase;margin-top:4px">Файлы</div>
+            </div>
+            <div class="adm-panel" style="padding:18px;margin:0;text-align:center">
+              <div style="font-size:1.3rem;font-weight:800;font-family:'Unbounded',sans-serif;color:${h.recentErrors>0?'var(--pink)':'var(--green)'}">${h.recentErrors}</div>
+              <div style="font-size:0.72rem;color:var(--text-3);font-weight:700;text-transform:uppercase;margin-top:4px">Ошибок за 24ч</div>
+            </div>
+          </div>
+          <div style="display:grid;grid-template-columns:1fr 1fr;gap:14px">
+            <div class="adm-panel" style="margin:0">
+              <div class="adm-panel-title">Платформа</div>
+              <table style="width:100%;font-size:0.88rem">
+                <tr><td style="color:var(--text-3);padding:4px 0">Node.js</td><td style="font-weight:600">${h.node}</td></tr>
+                <tr><td style="color:var(--text-3);padding:4px 0">OS</td><td style="font-weight:600">${h.platform}</td></tr>
+                <tr><td style="color:var(--text-3);padding:4px 0">CPU ядра</td><td style="font-weight:600">${h.cpus}</td></tr>
+                <tr><td style="color:var(--text-3);padding:4px 0">RAM использовано</td><td style="font-weight:600">${fmtBytes(h.memory.rss)}</td></tr>
+                <tr><td style="color:var(--text-3);padding:4px 0">RAM heap</td><td style="font-weight:600">${fmtBytes(h.memory.heapUsed)}</td></tr>
+                <tr><td style="color:var(--text-3);padding:4px 0">RAM свободно</td><td style="font-weight:600">${fmtBytes(h.freeMem)} / ${fmtBytes(h.totalMem)}</td></tr>
+              </table>
+            </div>
+            <div class="adm-panel" style="margin:0">
+              <div class="adm-panel-title">Данные</div>
+              <table style="width:100%;font-size:0.88rem">
+                <tr><td style="color:var(--text-3);padding:4px 0">Пользователей</td><td style="font-weight:600">${h.db.totalUsers}</td></tr>
+                <tr><td style="color:var(--text-3);padding:4px 0">Всего сессий</td><td style="font-weight:600">${h.db.totalSessions}</td></tr>
+                <tr><td style="color:var(--text-3);padding:4px 0">Сессий сегодня</td><td style="font-weight:600;color:var(--violet)">${h.db.todaySessions}</td></tr>
+                <tr><td style="color:var(--text-3);padding:4px 0">Вопросов в базе</td><td style="font-weight:600">${h.db.totalQuestions}</td></tr>
+              </table>
+            </div>
+          </div>`;
+      } catch (e) { el.innerHTML = `<div style="color:var(--pink)">${esc(e.message)}</div>`; }
+    }
+
+    /* ════════════════════════════════════════════════
+       ОНЛАЙН-УРОКИ (classroom admin)
+    ════════════════════════════════════════════════ */
+    let _crHistPage = 1, _crHistTotal = 0, _crHistPages = 0, _crHistSearch = '';
+    let _crOpenDetailId = null, _crHistDebTimer = null;
+
+    async function loadCrModuleState() {
+      try {
+        const features = await LS.api('/api/admin/features');
+        const chk = document.getElementById('cr-master-chk');
+        if (chk) chk.checked = features.classroom !== false;
+      } catch(e) { /* silent */ }
+    }
+
+    async function crMasterToggle(enabled) {
+      try {
+        await LS.api('/api/admin/features', { method: 'PATCH', body: JSON.stringify({ classroom: enabled }) });
+        LS.toast(enabled ? 'Модуль онлайн-уроков включён' : 'Модуль онлайн-уроков отключён', enabled ? 'success' : 'warning', 3000);
+      } catch(e) {
+        LS.toast('Ошибка: ' + e.message, 'error');
+        // revert checkbox
+        const chk = document.getElementById('cr-master-chk');
+        if (chk) chk.checked = !enabled;
+      }
+    }
+
+    function fmtDuration(sec) {
+      if (!sec || sec < 0) return '—';
+      const h = Math.floor(sec / 3600), m = Math.floor((sec % 3600) / 60), s = sec % 60;
+      if (h) return `${h}ч ${m}м`;
+      if (m) return `${m} мин ${s} сек`;
+      return `${s} сек`;
+    }
+    function fmtLiveDuration(createdAt) {
+      const sec = Math.round((Date.now() - new Date(createdAt).getTime()) / 1000);
+      return fmtDuration(sec);
+    }
+
+    async function loadCrActiveSessions() {
+      const el = document.getElementById('cr-live-list');
+      try {
+        const { sessions } = await LS.api('/api/classroom/admin/active');
+        if (!sessions.length) {
+          el.innerHTML = '<div class="empty">Нет активных уроков</div>';
+          return;
+        }
+        el.innerHTML = sessions.map(s => {
+          const dur = fmtLiveDuration(s.created_at);
+          const title = s.title || `Урок #${s.id}`;
+          const cls   = s.class_name ? `Класс: ${esc(s.class_name)}` : 'Личный урок';
+          return `<div class="cr-live-card">
+            <div class="cr-live-pulse"></div>
+            <div class="cr-live-info">
+              <div class="cr-live-title">${esc(title)}</div>
+              <div class="cr-live-meta">${esc(s.teacher_name)} · ${cls}</div>
+            </div>
+            <div class="cr-live-badges">
+              <span class="cr-badge cr-badge-online">
+                <svg class="ic" viewBox="0 0 24 24" style="width:11px;height:11px"><path d="M17 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2"/><circle cx="9" cy="7" r="4"/><path d="M23 21v-2a4 4 0 0 0-3-3.87"/><path d="M16 3.13a4 4 0 0 1 0 7.75"/></svg>
+                ${s.online_count}
+              </span>
+              <span class="cr-badge cr-badge-msgs">
+                <svg class="ic" viewBox="0 0 24 24" style="width:11px;height:11px"><path d="M21 15a2 2 0 0 1-2 2H7l-4 4V5a2 2 0 0 1 2-2h14a2 2 0 0 1 2 2z"/></svg>
+                ${s.message_count}
+              </span>
+              <span class="cr-badge cr-badge-dur">
+                <svg class="ic" viewBox="0 0 24 24" style="width:11px;height:11px"><circle cx="12" cy="12" r="10"/><polyline points="12 6 12 12 16 14"/></svg>
+                ${dur}
+              </span>
+            </div>
+            <div class="cr-live-actions">
+              <button class="btn-cr-end" onclick="adminEndSession(${s.id})">Завершить</button>
+            </div>
+          </div>`;
+        }).join('');
+      } catch(e) {
+        el.innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
+      }
+      if (window.lucide) lucide.createIcons();
+    }
+
+    async function adminEndSession(id) {
+      if (!await LS.confirm(`Завершить урок #${id}? Все участники будут отключены.`, { title: 'Завершить урок', confirmText: 'Завершить' })) return;
+      try {
+        await LS.api(`/api/classroom/${id}`, { method: 'DELETE' });
+        LS.toast('Урок завершён', 'success', 2500);
+        loadCrActiveSessions();
+      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+    }
+
+    function crHistDebounce() {
+      clearTimeout(_crHistDebTimer);
+      _crHistDebTimer = setTimeout(() => { _crHistPage = 1; loadCrHistory(); }, 350);
+    }
+
+    async function loadCrHistory(page) {
+      if (page) _crHistPage = page;
+      _crHistSearch = (document.getElementById('cr-hist-q')?.value || '').trim();
+      const el = document.getElementById('cr-hist-list');
+      el.innerHTML = '<div class="spinner"></div>';
+      try {
+        const params = new URLSearchParams({ page: _crHistPage, limit: 20 });
+        if (_crHistSearch) params.set('search', _crHistSearch);
+        const { sessions, total, pages } = await LS.api('/api/classroom/admin/sessions?' + params);
+        _crHistTotal = total; _crHistPages = pages;
+        document.getElementById('cr-hist-count').textContent = `${total} уроков`;
+        if (!sessions.length) {
+          el.innerHTML = '<div class="empty">Нет завершённых уроков</div>';
+          renderCrPagination();
+          return;
+        }
+        el.innerHTML = sessions.map(s => {
+          const title = s.title || `Урок #${s.id}`;
+          const cls   = s.class_name ? `Класс: ${esc(s.class_name)}` : 'Личный урок';
+          const dur   = fmtDuration(s.ended_at ? Math.round((new Date(s.ended_at)-new Date(s.created_at))/1000) : null);
+          return `<div>
+            <div class="cr-hist-row${_crOpenDetailId===s.id?' open':''}" onclick="toggleCrDetail(${s.id},this)">
+              <div class="cr-hist-icon">
+                <svg class="ic" viewBox="0 0 24 24" style="width:18px;height:18px;color:var(--violet)"><rect x="2" y="3" width="20" height="14" rx="2" ry="2"/><line x1="8" y1="21" x2="16" y2="21"/><line x1="12" y1="17" x2="12" y2="21"/></svg>
+              </div>
+              <div class="cr-hist-main">
+                <div class="cr-hist-title">${esc(title)}</div>
+                <div class="cr-hist-meta">${esc(s.teacher_name)} · ${cls} · ${fmtDate(s.ended_at || s.created_at)}</div>
+              </div>
+              <div class="cr-hist-chips">
+                <span class="cr-badge cr-badge-online">${s.participant_count} уч.</span>
+                <span class="cr-badge cr-badge-msgs">${s.message_count} сообщ.</span>
+                <span class="cr-badge cr-badge-dur">${dur}</span>
+              </div>
+              <svg class="cr-hist-chevron ic" viewBox="0 0 24 24"><polyline points="6 9 12 15 18 9"/></svg>
+            </div>
+            <div class="cr-detail-drawer${_crOpenDetailId===s.id?' open':''}" id="cr-detail-${s.id}">
+              <div class="cr-detail-inner" id="cr-detail-inner-${s.id}">
+                <div class="spinner"></div>
+              </div>
+            </div>
+          </div>`;
+        }).join('');
+        if (_crOpenDetailId) {
+          const dr = document.getElementById(`cr-detail-${_crOpenDetailId}`);
+          if (dr) loadCrSessionDetail(_crOpenDetailId);
+        }
+        renderCrPagination();
+      } catch(e) {
+        el.innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
+      }
+      if (window.lucide) lucide.createIcons();
+    }
+
+    function renderCrPagination() {
+      const el = document.getElementById('cr-hist-pagination');
+      if (_crHistPages <= 1) { el.innerHTML = ''; return; }
+      const p = _crHistPage, total = _crHistPages;
+      let html = '<div class="cr-pagination">';
+      html += `<button class="cr-page-btn" onclick="loadCrHistory(${p-1})" ${p<=1?'disabled':''}>
+        <svg class="ic" viewBox="0 0 24 24" style="width:14px;height:14px"><polyline points="15 18 9 12 15 6"/></svg>
+      </button>`;
+      const range = [];
+      for (let i=1;i<=total;i++) {
+        if (i===1||i===total||Math.abs(i-p)<=1) range.push(i);
+        else if (range[range.length-1]!=='…') range.push('…');
+      }
+      range.forEach(r => {
+        if (r==='…') html += `<span class="cr-page-info">…</span>`;
+        else html += `<button class="cr-page-btn${r===p?' active':''}" onclick="loadCrHistory(${r})">${r}</button>`;
+      });
+      html += `<button class="cr-page-btn" onclick="loadCrHistory(${p+1})" ${p>=total?'disabled':''}>
+        <svg class="ic" viewBox="0 0 24 24" style="width:14px;height:14px"><polyline points="9 18 15 12 9 6"/></svg>
+      </button></div>`;
+      el.innerHTML = html;
+    }
+
+    async function toggleCrDetail(id, rowEl) {
+      const wasOpen = _crOpenDetailId === id;
+      // close all
+      document.querySelectorAll('.cr-hist-row.open').forEach(r => r.classList.remove('open'));
+      document.querySelectorAll('.cr-detail-drawer.open').forEach(d => { d.classList.remove('open'); d.style.maxHeight=''; });
+      _crOpenDetailId = null;
+      if (wasOpen) return;
+      // open this one
+      rowEl.classList.add('open');
+      const dr = document.getElementById(`cr-detail-${id}`);
+      if (dr) { dr.classList.add('open'); }
+      _crOpenDetailId = id;
+      await loadCrSessionDetail(id);
+    }
+
+    async function loadCrSessionDetail(id) {
+      const inner = document.getElementById(`cr-detail-inner-${id}`);
+      if (!inner) return;
+      inner.innerHTML = '<div class="spinner"></div>';
+      try {
+        const { session, stats, attendance, pages } = await LS.api(`/api/classroom/${id}/summary`);
+        const dur = fmtDuration(stats.duration_sec);
+        inner.innerHTML = `
+          <div class="cr-detail-grid">
+            <div class="cr-detail-stat"><div class="cr-detail-val">${stats.participant_count}</div><div class="cr-detail-label">Участников</div></div>
+            <div class="cr-detail-stat"><div class="cr-detail-val">${stats.message_count}</div><div class="cr-detail-label">Сообщений</div></div>
+            <div class="cr-detail-stat"><div class="cr-detail-val">${stats.page_count}</div><div class="cr-detail-label">Страниц</div></div>
+            <div class="cr-detail-stat"><div class="cr-detail-val" style="font-size:1rem">${dur}</div><div class="cr-detail-label">Длительность</div></div>
+          </div>
+          ${attendance.length ? `
+            <div class="section-title" style="font-size:0.72rem;margin-bottom:8px">Посещаемость</div>
+            <div class="cr-attend-list">
+              ${attendance.map(a => `
+                <div class="cr-attend-row">
+                  <svg class="ic" viewBox="0 0 24 24" style="width:15px;height:15px;flex-shrink:0;color:var(--violet)"><path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2"/><circle cx="12" cy="7" r="4"/></svg>
+                  <span class="cr-attend-name">${esc(a.user_name)}</span>
+                  <span class="cr-attend-time">${a.joined_at ? new Date(a.joined_at).toLocaleTimeString('ru-RU',{hour:'2-digit',minute:'2-digit'}) : '—'}</span>
+                  <span class="cr-attend-dur">${a.duration_sec ? fmtDuration(a.duration_sec) : (a.left_at ? '—' : '<span style="color:var(--green)">онлайн</span>')}</span>
+                </div>
+              `).join('')}
+            </div>
+          ` : ''}
+          ${pages.length > 1 ? `
+            <div class="section-title" style="font-size:0.72rem;margin:16px 0 8px">Страницы доски</div>
+            <div class="cr-pages-list">
+              ${pages.map(p => `
+                <div class="cr-page-chip">
+                  <span class="cr-page-num">Стр. ${p.page_num}</span>
+                  <span class="cr-page-cnt">${p.stroke_count} штр.</span>
+                </div>
+              `).join('')}
+            </div>
+          ` : ''}
+          <div class="cr-detail-actions">
+            <button class="btn-cr-export" onclick="adminExportChat(${id})">
+              <svg class="ic" viewBox="0 0 24 24" style="width:13px;height:13px;vertical-align:-2px"><path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/><polyline points="7 10 12 15 17 10"/><line x1="12" y1="15" x2="12" y2="3"/></svg>
+              Экспорт чата
+            </button>
+            <button class="btn-cr-del" onclick="adminDeleteSession(${id})">
+              <svg class="ic" viewBox="0 0 24 24" style="width:13px;height:13px;vertical-align:-2px"><polyline points="3 6 5 6 21 6"/><path d="M19 6l-1 14a2 2 0 0 1-2 2H8a2 2 0 0 1-2-2L5 6"/><path d="M10 11v6"/><path d="M14 11v6"/></svg>
+              Удалить запись
+            </button>
+          </div>`;
+      } catch(e) {
+        inner.innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
+      }
+    }
+
+    function adminExportChat(id) {
+      window.open(`/api/classroom/${id}/chat/export`, '_blank');
+    }
+
+    async function adminDeleteSession(id) {
+      if (!await LS.confirm('Удалить всю запись об этом уроке? Данные нельзя восстановить.', { title: 'Удалить урок', confirmText: 'Удалить', dangerous: true })) return;
+      try {
+        await LS.api(`/api/classroom/${id}/history`, { method: 'DELETE' });
+        LS.toast('Урок удалён', 'success', 2500);
+        _crOpenDetailId = null;
+        loadCrHistory();
+      } catch(e) { LS.toast('Ошибка: ' + e.message, 'error'); }
+    }
+
+    /* ─── wire tab loading ─── */
+    const _origSwitchTab = window.switchTab;
+    window.switchTab = function(btn) {
+      _origSwitchTab(btn);
+      const tab = btn.dataset.tab;
+      if (tab === 'topics') loadTopics();
+      else if (tab === 'audit') loadAuditLog();
+      else if (tab === 'errors') loadErrorLog();
+      else if (tab === 'health') loadHealth();
+      else if (tab === 'classroom') { loadCrModuleState(); loadCrActiveSessions(); loadCrHistory(); }
+      else if (tab === 'avatars')   { loadAvatarRequests(); }
+    };
+
+    /* ── Avatar moderation ─────────────────────────────────────────────── */
+    async function loadAvatarRequests() {
+      const list = document.getElementById('av-list');
+      list.innerHTML = '<div style="color:var(--muted);text-align:center;padding:40px 0;font-size:0.85rem">Загрузка...</div>';
+      try {
+        const rows = await LS.get('/api/avatar/pending');
+        const badge = document.getElementById('av-badge');
+        if (rows.length) {
+          badge.textContent = rows.length;
+          badge.style.display = 'inline-flex';
+        } else {
+          badge.style.display = 'none';
+        }
+        if (!rows.length) {
+          list.innerHTML = '<div class="av-empty"><i data-lucide="check-circle" style="width:36px;height:36px;opacity:.3;display:block;margin:0 auto 10px"></i>Нет заявок на модерацию</div>';
+          if (window.lucide) lucide.createIcons();
+          return;
+        }
+        list.innerHTML = `<div class="av-grid">${rows.map(r => {
+          const initials = (r.user_name||'LS').split(' ').slice(0,2).map(w=>(w[0]||'').toUpperCase()).join('') || 'LS';
+          const curAvatar = r.current_avatar
+            ? `<img src="/avatars/${esc(r.current_avatar)}" alt="">`
+            : initials;
+          const newAvatar = `<img src="/avatars/${esc(r.filename)}" alt="" onerror="this.parentElement.textContent='?'">`;
+          const d = new Date(r.created_at).toLocaleString('ru', { day:'numeric', month:'short', hour:'2-digit', minute:'2-digit' });
+          return `<div class="av-card" id="av-card-${r.id}">
+            <div class="av-card-top">
+              <div class="av-imgs">
+                <div class="av-img-wrap">
+                  <span>Сейчас</span>
+                  <div class="av-img">${curAvatar}</div>
+                </div>
+                <svg class="av-arrow" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" width="16" height="16"><line x1="5" y1="12" x2="19" y2="12"/><polyline points="12 5 19 12 12 19"/></svg>
+                <div class="av-img-wrap">
+                  <span>Новый</span>
+                  <div class="av-img">${newAvatar}</div>
+                </div>
+              </div>
+            </div>
+            <div>
+              <div class="av-user-name">${esc(r.user_name||r.user_email)}</div>
+              <div class="av-date">${esc(r.user_email)} · ${d}</div>
+            </div>
+            <div class="av-actions">
+              <button class="av-approve" onclick="avatarApprove(${r.id})">Одобрить</button>
+              <button class="av-reject"  onclick="avatarRejectPrompt(${r.id})">Отклонить</button>
+            </div>
+          </div>`;
+        }).join('')}</div>`;
+        if (window.lucide) lucide.createIcons();
+      } catch {
+        list.innerHTML = '<div class="av-empty">Ошибка загрузки</div>';
+      }
+    }
+
+    async function avatarApprove(id) {
+      const card = document.getElementById('av-card-' + id);
+      if (card) card.style.opacity = '0.5';
+      try {
+        await LS.post('/api/avatar/' + id + '/approve', {});
+        LS.toast('Аватар одобрен', 'success');
+        loadAvatarRequests();
+      } catch { LS.toast('Ошибка', 'error'); if (card) card.style.opacity = ''; }
+    }
+
+    function avatarRejectPrompt(id) {
+      const reason = prompt('Причина отклонения (необязательно):') ?? null;
+      if (reason === null) return; // cancelled
+      avatarReject(id, reason);
+    }
+
+    async function avatarReject(id, reason) {
+      const card = document.getElementById('av-card-' + id);
+      if (card) card.style.opacity = '0.5';
+      try {
+        await LS.patch('/api/avatar/' + id + '/reject', { reason });
+        LS.toast('Аватар отклонён', 'info');
+        loadAvatarRequests();
+      } catch { LS.toast('Ошибка', 'error'); if (card) card.style.opacity = ''; }
+    }
+
+    /* ─── init ─── */
+    loadStats();
+    loadAvatarRequests(); // load badge count on page open
+    if (window.lucide) lucide.createIcons();