diff --git a/frontend/admin.html b/frontend/admin.html
index 8c38483..dc35bff 100644
--- a/frontend/admin.html
+++ b/frontend/admin.html
@@ -139,7 +139,8 @@
     /* tables */
     .table-wrap { background: var(--surface); backdrop-filter: var(--blur); border: 1px solid var(--border); border-radius: var(--r-lg); overflow: hidden; margin-bottom: 48px; box-shadow: var(--shadow); }
     table { width: 100%; border-collapse: collapse; }
-    th { padding: 14px 20px; text-align: left; font-size: 0.82rem; font-weight: 700; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.06em; border-bottom: 1px solid var(--border); background: rgba(238,242,255,0.5); }
+    /* Sticky header: stays visible while body scrolls (in .sb-content). Background opaque (not transparent) so rows scroll cleanly behind. */
+    th { padding: 14px 20px; text-align: left; font-size: 0.82rem; font-weight: 700; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.06em; border-bottom: 1px solid var(--border); background: #E5EAF7; position: sticky; top: 0; z-index: 5; }
     td { padding: 15px 20px; font-size: 0.94rem; border-bottom: 1px solid var(--border); vertical-align: middle; }
     tr:last-child td { border-bottom: none; }
     tr.clickable { cursor: pointer; transition: background var(--tr); }
@@ -196,6 +197,22 @@
     }
     .admin-nav-label:first-child { margin-top: 0; }
     .admin-nav-sep { height: 1px; background: var(--border); margin: 8px 6px; }
+    /* Collapsible nav groups */
+    .admin-nav-group { margin-bottom: 6px; }
+    .admin-nav-ghdr {
+      width: 100%; padding: 6px 10px 4px; border: none; background: none;
+      display: flex; align-items: center; justify-content: space-between;
+      font-family: 'Manrope', system-ui, sans-serif;
+      font-size: 0.68rem; font-weight: 800; letter-spacing: 0.08em;
+      color: var(--text-3); text-transform: uppercase;
+      cursor: pointer; transition: color .12s, opacity .12s; opacity: .72;
+    }
+    .admin-nav-ghdr:hover { color: var(--violet); opacity: 1; }
+    .admin-nav-ghdr .adm-chev { width: 12px; height: 12px; transition: transform .18s; }
+    .admin-nav-group.collapsed .adm-chev { transform: rotate(-90deg); }
+    .admin-nav-body { display: flex; flex-direction: column; max-height: 1500px; overflow: hidden; transition: max-height .25s ease, opacity .18s; opacity: 1; }
+    .admin-nav-group.collapsed .admin-nav-body { max-height: 0; opacity: 0; pointer-events: none; }
+    .admin-nav-group .admin-nav-item { padding-left: 10px; }
     .admin-nav-item {
       display: flex; align-items: center; gap: 10px;
       padding: 10px 12px; border-radius: 10px; border: none;
@@ -874,80 +891,105 @@
     <div class="admin-layout">
     <nav class="admin-nav" id="admin-nav">
 
-      <div class="admin-nav-label">Аналитика</div>
-      <button class="admin-nav-item active" data-tab="stats" onclick="switchTab(this)">
-        <i data-lucide="bar-chart-2" style="width:15px;height:15px"></i> Статистика
-      </button>
-      <button class="admin-nav-item" data-tab="sessions" onclick="switchTab(this)">
-        <i data-lucide="clock" style="width:15px;height:15px"></i> История сессий
-      </button>
-      <button class="admin-nav-item" data-tab="classroom" onclick="switchTab(this)">
-        <i data-lucide="video" style="width:15px;height:15px"></i> Онлайн-уроки
-      </button>
+      <div class="admin-nav-group" data-ng="analytics">
+        <button class="admin-nav-ghdr" onclick="toggleAdminGroup('analytics')">
+          <span>Аналитика</span>
+          <svg class="adm-chev" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="6 9 12 15 18 9"/></svg>
+        </button>
+        <div class="admin-nav-body">
+          <button class="admin-nav-item active" data-tab="stats" onclick="switchTab(this)">
+            <i data-lucide="bar-chart-2" style="width:15px;height:15px"></i> Статистика
+          </button>
+          <button class="admin-nav-item" data-tab="sessions" onclick="switchTab(this)">
+            <i data-lucide="clock" style="width:15px;height:15px"></i> История сессий
+          </button>
+          <button class="admin-nav-item" data-tab="classroom" onclick="switchTab(this)">
+            <i data-lucide="video" style="width:15px;height:15px"></i> Онлайн-уроки
+          </button>
+        </div>
+      </div>
 
-      <div class="admin-nav-sep"></div>
-      <div class="admin-nav-label">Контент</div>
-      <button class="admin-nav-item" data-tab="questions" onclick="switchTab(this)">
-        <i data-lucide="help-circle" style="width:15px;height:15px"></i> Вопросы
-      </button>
-      <button class="admin-nav-item" data-tab="tests" onclick="switchTab(this)">
-        <i data-lucide="clipboard-list" style="width:15px;height:15px"></i> Тесты
-      </button>
-      <button class="admin-nav-item" data-tab="assignments" onclick="switchTab(this)">
-        <i data-lucide="file-check" style="width:15px;height:15px"></i> Задания
-      </button>
-      <button class="admin-nav-item" data-tab="subjects" onclick="switchTab(this)" id="btn-tab-subjects" style="display:none">
-        <i data-lucide="book-marked" style="width:15px;height:15px"></i> Доступные тесты
-      </button>
-      <button class="admin-nav-item" data-tab="tpl" onclick="switchTab(this)" id="btn-tab-tpl" style="display:none">
-        <i data-lucide="copy" style="width:15px;height:15px"></i> Шаблоны
-      </button>
+      <div class="admin-nav-group" data-ng="content">
+        <button class="admin-nav-ghdr" onclick="toggleAdminGroup('content')">
+          <span>Контент</span>
+          <svg class="adm-chev" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="6 9 12 15 18 9"/></svg>
+        </button>
+        <div class="admin-nav-body">
+          <button class="admin-nav-item" data-tab="questions" onclick="switchTab(this)">
+            <i data-lucide="help-circle" style="width:15px;height:15px"></i> Вопросы
+          </button>
+          <button class="admin-nav-item" data-tab="tests" onclick="switchTab(this)">
+            <i data-lucide="clipboard-list" style="width:15px;height:15px"></i> Тесты
+          </button>
+          <button class="admin-nav-item" data-tab="assignments" onclick="switchTab(this)">
+            <i data-lucide="file-check" style="width:15px;height:15px"></i> Задания
+          </button>
+          <button class="admin-nav-item" data-tab="subjects" onclick="switchTab(this)" id="btn-tab-subjects" style="display:none">
+            <i data-lucide="book-marked" style="width:15px;height:15px"></i> Доступные тесты
+          </button>
+          <button class="admin-nav-item" data-tab="tpl" onclick="switchTab(this)" id="btn-tab-tpl" style="display:none">
+            <i data-lucide="copy" style="width:15px;height:15px"></i> Шаблоны
+          </button>
+          <button class="admin-nav-item" data-tab="topics" onclick="switchTab(this)">
+            <i data-lucide="list-tree" style="width:15px;height:15px"></i> Темы
+          </button>
+        </div>
+      </div>
 
-      <div class="admin-nav-sep"></div>
-      <div class="admin-nav-label">Пользователи</div>
-      <button class="admin-nav-item" data-tab="users" onclick="switchTab(this)">
-        <i data-lucide="users" style="width:15px;height:15px"></i> Пользователи
-      </button>
-      <button class="admin-nav-item" data-tab="permissions" onclick="switchTab(this)" id="btn-tab-permissions" style="display:none">
-        <i data-lucide="shield" style="width:15px;height:15px"></i> Права доступа
-      </button>
-      <button class="admin-nav-item" data-tab="avatars" onclick="switchTab(this);loadAvatarRequests()">
-        <i data-lucide="image" style="width:15px;height:15px"></i> Аватары
-        <span class="admin-badge" id="av-badge" style="display:none"></span>
-      </button>
+      <div class="admin-nav-group" data-ng="users">
+        <button class="admin-nav-ghdr" onclick="toggleAdminGroup('users')">
+          <span>Пользователи</span>
+          <svg class="adm-chev" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="6 9 12 15 18 9"/></svg>
+        </button>
+        <div class="admin-nav-body">
+          <button class="admin-nav-item" data-tab="users" onclick="switchTab(this)">
+            <i data-lucide="users" style="width:15px;height:15px"></i> Пользователи
+          </button>
+          <button class="admin-nav-item" data-tab="permissions" onclick="switchTab(this)" id="btn-tab-permissions" style="display:none">
+            <i data-lucide="shield" style="width:15px;height:15px"></i> Права доступа
+          </button>
+          <button class="admin-nav-item" data-tab="avatars" onclick="switchTab(this);loadAvatarRequests()">
+            <i data-lucide="image" style="width:15px;height:15px"></i> Аватары
+            <span class="admin-badge" id="av-badge" style="display:none"></span>
+          </button>
+          <button class="admin-nav-item" data-tab="sublog" onclick="switchTab(this)">
+            <i data-lucide="file-x" style="width:15px;height:15px"></i> Журнал работ
+          </button>
+          <button class="admin-nav-item" data-tab="broadcast" onclick="switchTab(this)">
+            <i data-lucide="megaphone" style="width:15px;height:15px"></i> Рассылка
+          </button>
+        </div>
+      </div>
 
-      <div class="admin-nav-sep" id="admin-nav-system-sep" style="display:none"></div>
-      <div class="admin-nav-label" id="admin-nav-system-label" style="display:none">Система</div>
-      <button class="admin-nav-item" data-tab="shop" onclick="switchTab(this)" id="btn-tab-shop" style="display:none">
-        <i data-lucide="shopping-bag" style="width:15px;height:15px"></i> Магазин
-      </button>
-      <button class="admin-nav-item" data-tab="gam" onclick="switchTab(this)" id="btn-tab-gam" style="display:none">
-        <i data-lucide="trophy" style="width:15px;height:15px"></i> Геймификация
-      </button>
-      <button class="admin-nav-item" data-tab="sims" onclick="switchTab(this)" id="btn-tab-sims" style="display:none">
-        <i data-lucide="atom" style="width:15px;height:15px"></i> Симуляции
-      </button>
-      <button class="admin-nav-item" data-tab="games" onclick="switchTab(this)" id="btn-tab-games" style="display:none">
-        <i data-lucide="gamepad-2" style="width:15px;height:15px"></i> Игры
-      </button>
-      <button class="admin-nav-item" data-tab="sublog" onclick="switchTab(this)">
-        <i data-lucide="file-x" style="width:15px;height:15px"></i> Журнал работ
-      </button>
-      <button class="admin-nav-item" data-tab="topics" onclick="switchTab(this)">
-        <i data-lucide="list-tree" style="width:15px;height:15px"></i> Темы
-      </button>
-      <button class="admin-nav-item" data-tab="broadcast" onclick="switchTab(this)">
-        <i data-lucide="megaphone" style="width:15px;height:15px"></i> Рассылка
-      </button>
-      <button class="admin-nav-item" data-tab="audit" onclick="switchTab(this)">
-        <i data-lucide="scroll-text" style="width:15px;height:15px"></i> Аудит-лог
-      </button>
-      <button class="admin-nav-item" data-tab="errors" onclick="switchTab(this)">
-        <i data-lucide="bug" style="width:15px;height:15px"></i> Ошибки
-      </button>
-      <button class="admin-nav-item" data-tab="health" onclick="switchTab(this)">
-        <i data-lucide="activity" style="width:15px;height:15px"></i> Здоровье
-      </button>
+      <div class="admin-nav-group" data-ng="system" id="admin-nav-system-group" style="display:none">
+        <button class="admin-nav-ghdr" onclick="toggleAdminGroup('system')">
+          <span>Система</span>
+          <svg class="adm-chev" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="6 9 12 15 18 9"/></svg>
+        </button>
+        <div class="admin-nav-body">
+          <button class="admin-nav-item" data-tab="shop" onclick="switchTab(this)" id="btn-tab-shop" style="display:none">
+            <i data-lucide="shopping-bag" style="width:15px;height:15px"></i> Магазин
+          </button>
+          <button class="admin-nav-item" data-tab="gam" onclick="switchTab(this)" id="btn-tab-gam" style="display:none">
+            <i data-lucide="trophy" style="width:15px;height:15px"></i> Геймификация
+          </button>
+          <button class="admin-nav-item" data-tab="sims" onclick="switchTab(this)" id="btn-tab-sims" style="display:none">
+            <i data-lucide="atom" style="width:15px;height:15px"></i> Симуляции
+          </button>
+          <button class="admin-nav-item" data-tab="games" onclick="switchTab(this)" id="btn-tab-games" style="display:none">
+            <i data-lucide="gamepad-2" style="width:15px;height:15px"></i> Игры
+          </button>
+          <button class="admin-nav-item" data-tab="audit" onclick="switchTab(this)">
+            <i data-lucide="scroll-text" style="width:15px;height:15px"></i> Аудит-лог
+          </button>
+          <button class="admin-nav-item" data-tab="errors" onclick="switchTab(this)">
+            <i data-lucide="bug" style="width:15px;height:15px"></i> Ошибки
+          </button>
+          <button class="admin-nav-item" data-tab="health" onclick="switchTab(this)">
+            <i data-lucide="activity" style="width:15px;height:15px"></i> Здоровье
+          </button>
+        </div>
+      </div>
 
     </nav>
     <div class="admin-main">
@@ -1192,7 +1234,7 @@
       </div>
 
       <div class="adm-panel" id="shop-item-form" style="display:none">
-        <div class="adm-panel-title" id="shop-form-title">Новый товар</div>
+        <div class="adm-panel-title" id="shop-form-title">Добавить товар</div>
         <div class="adm-form-row">
           <div class="adm-form-group" style="flex:1">
             <label>Название</label>
@@ -1428,7 +1470,7 @@
         <div class="adm-panel" style="padding:16px 20px">
           <div class="adm-form-row" style="margin:0">
             <div class="adm-form-group" style="flex:1"><label>Название</label><input type="text" id="topics-new-name" placeholder="Название темы" /></div>
-            <button class="adm-btn adm-btn-primary adm-btn-small" onclick="createTopic()" style="align-self:flex-end">Создать</button>
+            <button class="adm-btn adm-btn-primary adm-btn-small" onclick="createTopic()" style="align-self:flex-end">Добавить</button>
             <button class="adm-btn adm-btn-small" style="background:var(--border-h);color:var(--text-3);align-self:flex-end" onclick="document.getElementById('topics-add-row').style.display='none'">Отмена</button>
           </div>
         </div>
diff --git a/frontend/js/admin/admin.js b/frontend/js/admin/admin.js
index 64f63cd..d61bc7d 100644
--- a/frontend/js/admin/admin.js
+++ b/frontend/js/admin/admin.js
@@ -12,9 +12,24 @@
         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 = '';
+      const sysGroup = document.getElementById('admin-nav-system-group');
+      if (sysGroup) sysGroup.style.display = '';
     }
+
+    /* Collapsible nav groups — state persisted in localStorage */
+    window.toggleAdminGroup = function (slug) {
+      const g = document.querySelector(`.admin-nav-group[data-ng="${slug}"]`);
+      if (!g) return;
+      const collapsed = g.classList.toggle('collapsed');
+      try { localStorage.setItem('ls_adm_g_' + slug, collapsed ? '1' : '0'); } catch {}
+    };
+    // Restore collapsed state on page load
+    document.querySelectorAll('.admin-nav-group').forEach(g => {
+      const slug = g.dataset.ng;
+      try {
+        if (localStorage.getItem('ls_adm_g_' + slug) === '1') g.classList.add('collapsed');
+      } catch {}
+    });
     LS.showBoardIfAllowed();
     LS.hideDisabledFeatures?.();
     LS.notif?.init();
@@ -412,7 +427,7 @@
     /* ─── Modal ─── */
     function openQModal(q = null) {
       editingQId = q ? q.id : null;
-      document.getElementById('q-modal-title').textContent = q ? `Редактировать вопрос #${q.id}` : 'Новый вопрос';
+      document.getElementById('q-modal-title').textContent = q ? `Редактировать вопрос #${q.id}` : 'Добавить вопрос';
       const textEl = document.getElementById('qf-text');
       textEl.value = q?.text || '';
       updateCharCounter(textEl, 'qf-text-cnt', 500);
@@ -2236,7 +2251,7 @@
 
     function shopAdminCreateItem() {
       _shopEditId = null;
-      document.getElementById('shop-form-title').textContent = 'Новый товар';
+      document.getElementById('shop-form-title').textContent = 'Добавить товар';
       document.getElementById('shop-f-name').value = '';
       document.getElementById('shop-f-type').value = 'frame';
       document.getElementById('shop-f-price').value = '100';