diff --git a/frontend/trainer.html b/frontend/trainer.html
index 707e0eb..a4a6759 100644
--- a/frontend/trainer.html
+++ b/frontend/trainer.html
@@ -10,164 +10,232 @@
   <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.16.9/dist/katex.min.css"/>
   <script src="https://unpkg.com/lucide@0.469.0/dist/umd/lucide.min.js"></script>
   <style>
-    /* ════════════════════ Страница «Тренажёр» (прототип) ════════════════════ */
-    .tr-wrap { max-width: 760px; margin: 0 auto; padding: 26px 20px 80px; }
+    /* ═══════════════ Тренажёр — «рабочий лист в клетку» ═══════════════
+       Фон — ambient-клетка (материал предмета: тетрадь в клетку). Задача —
+       чистая карточка-герой с акцентной «решающей» полосой. Акцент индиго→
+       фиолет, успех — изумруд, мастерство — золото. Логика/классы не менялись. */
+    :root {
+      --ink: #1b1f38; --ink-soft: #5b6378; --ink-faint: #98a1b8;
+      --card: #ffffff;
+      --g1: #6366f1; --g2: #8b5cf6;
+      --accent-ink: #4338ca; --accent-soft: #eef0ff;
+      --ok: #10b981; --ok-ink: #047857; --ok-soft: #dcfce7;
+      --bad: #ef4444; --bad-soft: #fee2e2; --warn: #d97706;
+      --gold: #f59e0b;
+      --r-lg: 24px;
+      --sh: 0 16px 40px rgba(27,31,56,.09), 0 2px 6px rgba(27,31,56,.04);
+      --sh-lg: 0 30px 70px rgba(27,31,56,.20);
+      --ease: cubic-bezier(.22,.61,.36,1);
+    }
+    .sb-content {
+      background-color: #f5f6fb;
+      background-image:
+        radial-gradient(1000px 600px at 86% -10%, rgba(139,92,246,.10), transparent 60%),
+        radial-gradient(820px 560px at 2% -6%, rgba(99,102,241,.09), transparent 55%),
+        linear-gradient(rgba(99,102,241,.05) 1px, transparent 1px),
+        linear-gradient(90deg, rgba(99,102,241,.05) 1px, transparent 1px);
+      background-size: 100% 100%, 100% 100%, 26px 26px, 26px 26px;
+      background-attachment: fixed;
+    }
+    .tr-wrap { max-width: 740px; margin: 0 auto; padding: 34px 20px 90px; }
+    @keyframes trUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
+    .tr-head, .tr-overall, .tr-mode, .tr-topics, .tr-skills, .tr-card { animation: trUp .5s var(--ease) both; }
+    .tr-overall { animation-delay: .04s; } .tr-mode { animation-delay: .06s; }
+    .tr-topics { animation-delay: .1s; } .tr-skills { animation-delay: .13s; } .tr-card { animation-delay: .16s; }
 
-    .tr-head { margin-bottom: 18px; }
-    .tr-h1 { font-family: 'Manrope', sans-serif; font-weight: 800; font-size: 1.5rem; color: var(--text, #1e293b); margin: 0 0 4px; }
-    .tr-sub { color: var(--muted, #64748b); font-size: .92rem; }
+    .tr-head { margin-bottom: 20px; }
+    .tr-h1 {
+      font-family: 'Manrope', sans-serif; font-weight: 800; font-size: clamp(1.6rem, 4.4vw, 2.1rem);
+      letter-spacing: -.02em; color: var(--ink); margin: 0 0 6px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
+    }
+    .tr-sub { color: var(--ink-soft); font-size: .95rem; line-height: 1.5; }
     .tr-pill {
-      display: inline-block; font-size: .68rem; font-weight: 800; text-transform: uppercase; letter-spacing: .04em;
-      padding: 3px 10px; border-radius: 99px; background: rgba(99,102,241,0.12); color: #6366f1; margin-left: 8px; vertical-align: middle;
+      display: inline-block; font-size: .66rem; font-weight: 800; text-transform: uppercase; letter-spacing: .06em;
+      padding: 5px 11px; border-radius: 99px; color: #fff; vertical-align: middle;
+      background: linear-gradient(135deg, var(--g1), var(--g2)); box-shadow: 0 6px 16px rgba(99,102,241,.30);
     }
 
-    /* ── выбор темы ── */
-    .tr-topics { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0 20px; }
+    /* ── выбор темы (вкладки) ── */
+    .tr-topics { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 12px; }
     .tr-chip {
-      font: inherit; font-size: .85rem; font-weight: 600; cursor: pointer;
-      padding: 8px 14px; border-radius: 99px; border: 1px solid rgba(148,163,184,0.32);
-      background: #fff; color: #475569; transition: .15s;
+      font: inherit; font-size: .86rem; font-weight: 700; cursor: pointer; color: var(--ink-soft);
+      padding: 9px 16px; border-radius: 99px; border: 1px solid rgba(99,102,241,.18);
+      background: rgba(255,255,255,.7); backdrop-filter: blur(6px); transition: .18s var(--ease);
     }
-    .tr-chip:hover { border-color: #818cf8; color: #4f46e5; }
-    .tr-chip.on { background: #6366f1; border-color: #6366f1; color: #fff; box-shadow: 0 6px 16px rgba(99,102,241,0.28); }
+    .tr-chip:hover { border-color: var(--g1); color: var(--accent-ink); transform: translateY(-1px); }
+    .tr-chip.on { color: #fff; border-color: transparent; background: linear-gradient(135deg, var(--g1), var(--g2)); box-shadow: 0 8px 20px rgba(99,102,241,.34); }
 
-    /* ── карточка задачи ── */
+    /* ── карточка задачи (герой) ── */
     .tr-card {
-      background: #fff; border: 1px solid rgba(148,163,184,0.22); border-radius: 18px;
-      padding: 28px 26px; box-shadow: 0 14px 40px rgba(15,23,42,0.06);
+      position: relative; overflow: hidden; background: var(--card);
+      border: 1px solid rgba(99,102,241,.10); border-radius: var(--r-lg);
+      padding: 34px 30px 30px; box-shadow: var(--sh); transition: box-shadow .3s var(--ease), transform .3s var(--ease);
+    }
+    .tr-card::before { content: ''; position: absolute; left: 0; right: 0; top: 0; height: 5px; background: linear-gradient(90deg, var(--g1), var(--g2)); }
+    .tr-card.tr-correct { box-shadow: 0 20px 54px rgba(16,185,129,.24); animation: trPop .5s var(--ease); }
+    .tr-card.tr-correct::before { height: 6px; background: linear-gradient(90deg, var(--ok), #34d399); }
+    .tr-card.tr-wrong { animation: trShake .42s var(--ease); }
+    .tr-card.tr-wrong::before { background: linear-gradient(90deg, var(--bad), #fb7185); }
+    @keyframes trPop { 0% { transform: scale(1); } 32% { transform: scale(1.014); } 100% { transform: scale(1); } }
+    @keyframes trShake { 0%,100% { transform: translateX(0); } 18% { transform: translateX(-7px); } 38% { transform: translateX(6px); } 58% { transform: translateX(-4px); } 78% { transform: translateX(2px); } }
+
+    #tr-skill {
+      color: var(--accent-ink); font-family: 'Manrope', sans-serif; font-size: .74rem; font-weight: 800;
+      text-transform: uppercase; letter-spacing: .07em; margin-bottom: 16px;
     }
-    .tr-skill { color: #64748b; font-size: .82rem; font-weight: 600; margin-bottom: 14px; }
     .tr-eq {
       font-family: 'Cambria Math', 'Times New Roman', Georgia, serif;
-      font-size: clamp(1.7rem, 5vw, 2.4rem); font-weight: 600; letter-spacing: .01em;
-      color: #0f172a; text-align: center; padding: 12px 0 22px; user-select: none;
+      font-size: clamp(1.8rem, 5.2vw, 2.5rem); font-weight: 600; letter-spacing: .01em;
+      color: var(--ink); text-align: center; padding: 8px 0 26px; user-select: none;
     }
 
-    .tr-inrow { display: flex; gap: 10px; align-items: stretch; max-width: 420px; margin: 0 auto; }
-    .tr-eqx { font-family: 'Cambria Math', serif; font-size: 1.4rem; color: #475569; align-self: center; }
+    .tr-inrow { display: flex; gap: 10px; align-items: stretch; max-width: 440px; margin: 0 auto; }
+    #tr-eqx { font-family: 'Cambria Math', serif; font-size: 1.5rem; font-weight: 600; color: var(--accent-ink); align-self: center; padding-left: 4px; }
     .tr-input {
-      flex: 1; min-width: 0; font: inherit; font-size: 1.15rem; text-align: center;
-      padding: 11px 14px; border-radius: 12px; border: 2px solid rgba(148,163,184,0.4); outline: none; transition: .15s;
+      flex: 1; min-width: 0; font: inherit; font-size: 1.2rem; font-weight: 600; text-align: center; color: var(--ink);
+      padding: 13px 16px; border-radius: 14px; border: 2px solid rgba(99,102,241,.22); background: #fff; outline: none; transition: .18s var(--ease);
     }
-    .tr-input:focus { border-color: #818cf8; box-shadow: 0 0 0 4px rgba(129,140,248,0.18); }
-    .tr-input:disabled { background: #f1f5f9; color: #64748b; }
+    .tr-input::placeholder { color: var(--ink-faint); font-weight: 500; }
+    .tr-input:focus { border-color: var(--g1); box-shadow: 0 0 0 4px rgba(99,102,241,.16); }
+    .tr-input:disabled { background: #f3f4fb; color: var(--ink-soft); }
 
     .tr-btn {
-      font: inherit; font-weight: 700; cursor: pointer; border: none; border-radius: 12px;
-      padding: 11px 20px; transition: .15s; display: inline-flex; align-items: center; gap: 7px;
+      font: inherit; font-weight: 700; cursor: pointer; border: none; border-radius: 14px;
+      padding: 13px 22px; transition: .18s var(--ease); display: inline-flex; align-items: center; gap: 7px;
     }
     .tr-btn .ic { width: 17px; height: 17px; }
-    .tr-primary { background: #6366f1; color: #fff; box-shadow: 0 6px 16px rgba(99,102,241,0.3); }
-    .tr-primary:hover { background: #4f46e5; }
-    .tr-ghost { background: rgba(148,163,184,0.14); color: #475569; }
-    .tr-ghost:hover { background: rgba(148,163,184,0.24); }
+    .tr-primary { color: #fff; background: linear-gradient(135deg, var(--g1), var(--g2)); box-shadow: 0 10px 24px rgba(99,102,241,.34); }
+    .tr-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 30px rgba(99,102,241,.42); }
+    .tr-primary:active { transform: translateY(0); }
+    .tr-ghost { background: rgba(99,102,241,.08); color: var(--accent-ink); }
+    .tr-ghost:hover { background: rgba(99,102,241,.15); }
 
-    .tr-feedback { text-align: center; min-height: 26px; margin: 18px 0 4px; font-weight: 700; font-size: 1rem; display: flex; align-items: center; justify-content: center; gap: 8px; }
+    .tr-feedback {
+      width: fit-content; margin: 20px auto 2px; min-height: 28px; padding: 7px 16px; border-radius: 99px;
+      font-weight: 700; font-size: 1rem; display: flex; align-items: center; justify-content: center; gap: 9px; transition: .2s var(--ease);
+    }
+    .tr-feedback:empty { padding: 0; min-height: 0; }
     .tr-feedback .ic { width: 19px; height: 19px; }
-    .tr-feedback.ok   { color: #16a34a; }
-    .tr-feedback.bad  { color: #dc2626; }
-    .tr-feedback.warn { color: #d97706; font-weight: 600; }
+    .tr-feedback.ok   { color: var(--ok-ink); background: var(--ok-soft); }
+    .tr-feedback.bad  { color: #b91c1c; background: var(--bad-soft); }
+    .tr-feedback.warn { color: var(--warn); background: #fef3c7; font-weight: 600; }
 
-    .tr-actions { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 8px; }
+    .tr-actions { display: flex; flex-wrap: wrap; gap: 9px; justify-content: center; margin-top: 14px; }
 
     .tr-solution {
-      margin-top: 20px; padding: 16px 18px; border-radius: 12px;
-      background: #f8fafc; border: 1px solid rgba(148,163,184,0.22);
+      margin-top: 22px; padding: 18px 20px; border-radius: 16px;
+      background: linear-gradient(180deg, #fbfbff, #f4f5fd); border: 1px solid rgba(99,102,241,.14);
+      animation: trUp .35s var(--ease) both;
     }
-    .tr-solution h4 { margin: 0 0 10px; font-size: .82rem; text-transform: uppercase; letter-spacing: .04em; color: #64748b; }
-    .tr-step { color: #334155; padding: 11px 0; }
-    .tr-step + .tr-step { border-top: 1px dashed rgba(148,163,184,0.28); }
-    .tr-step-note { display: block; color: #475569; font-family: 'Manrope', sans-serif; font-size: .92rem; line-height: 1.55; margin-bottom: 6px; }
-    .tr-step-math { display: block; font-family: 'Cambria Math', serif; font-size: 1.15rem; margin-left: 28px; }
-    .tr-step-n { display: inline-flex; align-items: center; justify-content: center; width: 21px; height: 21px; border-radius: 50%; background: #e0e7ff; color: #4f46e5; font-family: 'Manrope', sans-serif; font-size: .72rem; font-weight: 800; margin-right: 8px; vertical-align: 1px; }
+    .tr-solution h4 { margin: 0 0 12px; font-family: 'Manrope', sans-serif; font-size: .74rem; text-transform: uppercase; letter-spacing: .07em; color: var(--accent-ink); font-weight: 800; }
+    .tr-step { color: #334155; padding: 12px 0; }
+    .tr-step + .tr-step { border-top: 1px dashed rgba(99,102,241,.2); }
+    .tr-step-note { display: block; color: var(--ink-soft); font-family: 'Manrope', sans-serif; font-size: .92rem; line-height: 1.6; margin-bottom: 7px; }
+    .tr-step-math { display: block; font-family: 'Cambria Math', serif; font-size: 1.18rem; color: var(--ink); margin-left: 30px; }
+    .tr-step-n { display: inline-flex; align-items: center; justify-content: center; width: 22px; height: 22px; border-radius: 50%; background: linear-gradient(135deg, var(--g1), var(--g2)); color: #fff; font-family: 'Manrope', sans-serif; font-size: .72rem; font-weight: 800; margin-right: 9px; vertical-align: 1px; }
     .tr-eq .katex-display { margin: 0; }
-    /* текстовый prompt (проценты) — компактнее уравнения */
-    .tr-eq.tr-eq-text { font-family: 'Manrope', sans-serif; font-weight: 600; font-size: clamp(1.1rem, 3.4vw, 1.55rem); line-height: 1.4; color: #1e293b; }
+    .tr-eq .katex { font-size: 1.12em; }
+    /* текстовый prompt (проценты/упрощение) — компактнее уравнения */
+    .tr-eq.tr-eq-text { font-family: 'Manrope', sans-serif; font-weight: 600; font-size: clamp(1.15rem, 3.4vw, 1.6rem); line-height: 1.45; color: var(--ink); }
 
     /* выбор навыка внутри темы */
-    .tr-skills { display: flex; flex-wrap: wrap; gap: 7px; margin: -8px 0 22px; }
-    .tr-skill {
+    .tr-skills { display: flex; flex-wrap: wrap; gap: 7px; margin: 0 0 24px; }
+    .tr-skills .tr-skill {
       font: inherit; font-size: .85rem; font-weight: 600; cursor: pointer; font-family: 'Cambria Math', 'Times New Roman', serif;
-      padding: 6px 12px; border-radius: 10px; border: 1px solid rgba(148,163,184,0.3); background: #fff; color: #475569; transition: .15s;
-      display: inline-flex; align-items: center;
+      padding: 7px 13px; border-radius: 11px; border: 1px solid rgba(99,102,241,.16); background: rgba(255,255,255,.7);
+      color: var(--ink-soft); transition: .16s var(--ease); display: inline-flex; align-items: center;
     }
-    .tr-skill:hover { border-color: #818cf8; color: #4338ca; }
-    .tr-skill.on { background: #eef2ff; border-color: #818cf8; color: #4338ca; }
-    .tr-pool-info { font-size: .82rem; color: #64748b; align-self: center; margin-right: 4px; }
-    #tr-gen-btn { border-style: dashed; color: #4f46e5; }
+    .tr-skills .tr-skill:hover { border-color: var(--g1); color: var(--accent-ink); transform: translateY(-1px); }
+    .tr-skills .tr-skill.on { background: var(--accent-soft); border-color: var(--g1); color: var(--accent-ink); }
+    .tr-pool-info { font-size: .82rem; color: var(--ink-soft); align-self: center; margin-right: 6px; }
+    #tr-gen-btn { border-style: dashed; color: var(--accent-ink); }
 
     /* бейджи прогресса на чипах */
-    .tr-badge { display: inline-flex; margin-left: 7px; color: #16a34a; vertical-align: middle; }
+    .tr-badge { display: inline-flex; margin-left: 7px; color: var(--ok); vertical-align: middle; }
     .tr-badge .ic { width: 14px; height: 14px; }
     .tr-chip.on .tr-badge { color: #fff; }
-    .tr-badge-n { margin-left: 7px; font-size: .7rem; font-weight: 800; color: #94a3b8; background: rgba(148,163,184,0.16); border-radius: 99px; padding: 1px 7px; }
-    .tr-chip.on .tr-badge-n { color: #e0e7ff; background: rgba(255,255,255,0.2); }
+    .tr-badge-n { margin-left: 7px; font-size: .7rem; font-weight: 800; color: var(--ink-faint); background: rgba(99,102,241,.12); border-radius: 99px; padding: 1px 7px; }
+    .tr-chip.on .tr-badge-n { color: #fff; background: rgba(255,255,255,.24); }
 
     /* ── общий прогресс (лёгкая геймификация) ── */
-    .tr-overall { color: #6366f1; font-size: .84rem; font-weight: 600; margin: -2px 0 14px; }
+    .tr-overall { display: inline-flex; align-items: center; gap: 8px; color: var(--accent-ink); font-size: .82rem; font-weight: 700; margin: 0 0 14px; padding: 6px 13px; border-radius: 99px; background: rgba(99,102,241,.08); }
     .tr-overall:empty { display: none; }
 
-    /* ── модалка аналитики + тепловая карта ── */
-    .tr-modal { position: fixed; inset: 0; z-index: 50; background: rgba(15,23,42,0.5); display: flex; align-items: center; justify-content: center; padding: 20px; }
-    .tr-modal-card { background: #fff; border-radius: 16px; max-width: 920px; width: 100%; max-height: 86vh; overflow: auto; box-shadow: 0 24px 60px rgba(0,0,0,0.3); }
-    .tr-modal-head { display: flex; align-items: center; justify-content: space-between; padding: 16px 20px; border-bottom: 1px solid rgba(148,163,184,0.2); font-weight: 800; font-family: 'Manrope', sans-serif; font-size: 1.05rem; position: sticky; top: 0; background: #fff; }
-    .tr-modal-x { background: none; border: none; cursor: pointer; color: #64748b; padding: 4px; border-radius: 8px; }
-    .tr-modal-x:hover { background: rgba(148,163,184,0.15); color: #1e293b; }
+    /* ── модалка ── */
+    .tr-modal { position: fixed; inset: 0; z-index: 50; background: rgba(20,22,45,.55); backdrop-filter: blur(4px); display: flex; align-items: center; justify-content: center; padding: 20px; animation: trFade .2s ease; }
+    @keyframes trFade { from { opacity: 0; } to { opacity: 1; } }
+    .tr-modal-card { background: #fff; border-radius: 20px; max-width: 920px; width: 100%; max-height: 86vh; overflow: auto; box-shadow: var(--sh-lg); animation: trUp .3s var(--ease) both; }
+    .tr-modal-head { display: flex; align-items: center; justify-content: space-between; padding: 18px 22px; border-bottom: 1px solid rgba(99,102,241,.12); font-weight: 800; font-family: 'Manrope', sans-serif; font-size: 1.06rem; color: var(--ink); position: sticky; top: 0; background: #fff; z-index: 1; }
+    .tr-modal-x { background: none; border: none; cursor: pointer; color: var(--ink-soft); padding: 5px; border-radius: 9px; transition: .15s; }
+    .tr-modal-x:hover { background: rgba(99,102,241,.1); color: var(--ink); }
     .tr-modal-x .ic { width: 18px; height: 18px; }
-    #tr-an-body { padding: 18px 20px; }
-    .tr-an-picker { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
-    .tr-an-cls { font: inherit; font-size: .85rem; font-weight: 600; cursor: pointer; padding: 7px 13px; border-radius: 99px; border: 1px solid rgba(148,163,184,0.32); background: #fff; color: #475569; }
-    .tr-an-cls:hover, .tr-an-cls.on { border-color: #818cf8; color: #4338ca; background: #eef2ff; }
-    .tr-an-empty { color: #94a3b8; padding: 20px; text-align: center; }
-    .tr-hm-wrap { overflow-x: auto; }
-    table.tr-hm { border-collapse: collapse; font-size: .8rem; }
-    table.tr-hm th, table.tr-hm td { border: 1px solid rgba(148,163,184,0.22); padding: 6px 8px; text-align: center; white-space: nowrap; }
-    table.tr-hm th { background: #f8fafc; color: #475569; font-weight: 700; position: sticky; top: 0; }
-    .tr-hm-name { text-align: left !important; font-weight: 600; color: #334155; background: #f8fafc; position: sticky; left: 0; }
+    #tr-an-body, #tr-tch-body { padding: 20px 22px; }
+    .tr-an-picker { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
+    .tr-an-cls { font: inherit; font-size: .85rem; font-weight: 600; cursor: pointer; padding: 8px 14px; border-radius: 99px; border: 1px solid rgba(99,102,241,.2); background: #fff; color: var(--ink-soft); transition: .15s; }
+    .tr-an-cls:hover, .tr-an-cls.on { border-color: var(--g1); color: var(--accent-ink); background: var(--accent-soft); }
+    .tr-an-empty { color: var(--ink-faint); padding: 24px; text-align: center; }
+    .tr-hm-wrap { overflow-x: auto; border-radius: 12px; border: 1px solid rgba(99,102,241,.12); }
+    table.tr-hm { border-collapse: collapse; font-size: .8rem; width: 100%; }
+    table.tr-hm th, table.tr-hm td { border: 1px solid rgba(99,102,241,.1); padding: 7px 9px; text-align: center; white-space: nowrap; }
+    table.tr-hm th { background: #f6f7fd; color: var(--ink-soft); font-weight: 700; position: sticky; top: 0; }
+    .tr-hm-name { text-align: left !important; font-weight: 600; color: var(--ink); background: #f6f7fd; position: sticky; left: 0; }
     .tr-hm-none { color: #cbd5e1; }
     .tr-hm-cell { font-weight: 700; color: #334155; }
     .tr-hm-cell .ic { width: 14px; height: 14px; color: #fff; }
-    .tr-hm-sum { font-weight: 800; color: #4f46e5; background: #eef2ff; }
+    .tr-hm-sum { font-weight: 800; color: var(--accent-ink); background: var(--accent-soft); }
     /* форма авторинга задачи */
-    .tr-form { display: flex; flex-direction: column; gap: 12px; }
-    .tr-form label { display: flex; flex-direction: column; gap: 4px; font-size: .85rem; font-weight: 600; color: #475569; }
-    .tr-form input, .tr-form textarea { font: inherit; padding: 9px 11px; border: 1px solid rgba(148,163,184,0.4); border-radius: 10px; outline: none; resize: vertical; }
-    .tr-form input:focus, .tr-form textarea:focus { border-color: #818cf8; box-shadow: 0 0 0 3px rgba(129,140,248,0.15); }
+    .tr-form { display: flex; flex-direction: column; gap: 13px; }
+    .tr-form label { display: flex; flex-direction: column; gap: 5px; font-size: .85rem; font-weight: 700; color: var(--ink-soft); }
+    .tr-form input, .tr-form textarea { font: inherit; padding: 10px 12px; border: 1px solid rgba(99,102,241,.22); border-radius: 11px; outline: none; resize: vertical; color: var(--ink); transition: .15s; }
+    .tr-form input:focus, .tr-form textarea:focus { border-color: var(--g1); box-shadow: 0 0 0 3px rgba(99,102,241,.14); }
     .tr-form-row { display: flex; gap: 10px; flex-wrap: wrap; }
     .tr-form-row label { flex: 1; min-width: 110px; }
-    .tr-form-hint { font-size: .8rem; color: #64748b; }
+    .tr-form-hint { font-size: .8rem; color: var(--ink-soft); line-height: 1.5; }
     .tr-form-err { color: #dc2626; font-size: .85rem; font-weight: 600; min-height: 18px; }
 
     /* ── режим (умная тренировка) ── */
-    .tr-mode { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
+    .tr-mode { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; flex-wrap: wrap; }
     .tr-mode-btn {
       font: inherit; font-size: .85rem; font-weight: 700; cursor: pointer; display: inline-flex; align-items: center; gap: 7px;
-      padding: 8px 14px; border-radius: 99px; border: 1px solid rgba(148,163,184,0.32); background: #fff; color: #475569; transition: .15s;
+      padding: 9px 15px; border-radius: 99px; border: 1px solid rgba(99,102,241,.18); background: rgba(255,255,255,.7); color: var(--ink-soft); transition: .16s var(--ease);
     }
     .tr-mode-btn .ic { width: 16px; height: 16px; }
-    .tr-mode-btn:hover { border-color: #818cf8; color: #4f46e5; }
-    .tr-mode-btn.on { background: #6366f1; border-color: #6366f1; color: #fff; box-shadow: 0 6px 16px rgba(99,102,241,0.28); }
-    .tr-session { font-size: .85rem; font-weight: 700; color: #6366f1; }
+    .tr-mode-btn:hover { border-color: var(--g1); color: var(--accent-ink); transform: translateY(-1px); }
+    .tr-mode-btn.on { color: #fff; border-color: transparent; background: linear-gradient(135deg, var(--g1), var(--g2)); box-shadow: 0 8px 20px rgba(99,102,241,.32); }
+    .tr-session { font-size: .82rem; font-weight: 800; color: var(--accent-ink); padding: 4px 12px; border-radius: 99px; background: rgba(99,102,241,.1); }
+    .tr-session:empty { display: none; }
 
     /* ── итог сессии ── */
     .tr-summary {
-      background: #fff; border: 1px solid rgba(148,163,184,0.22); border-radius: 18px;
-      padding: 26px; box-shadow: 0 14px 40px rgba(15,23,42,0.06); text-align: center;
+      position: relative; overflow: hidden; background: #fff; border: 1px solid rgba(99,102,241,.1); border-radius: var(--r-lg);
+      padding: 30px 26px; box-shadow: var(--sh); text-align: center; animation: trPop .5s var(--ease);
     }
-    .tr-sum-h { margin: 0 0 16px; font-family: 'Manrope', sans-serif; font-weight: 800; font-size: 1.3rem; color: #1e293b; }
-    .tr-sum-row { display: inline-flex; flex-direction: column; align-items: center; margin: 0 16px 10px; }
-    .tr-sum-row b { font-size: 1.7rem; font-weight: 800; color: #4f46e5; font-family: 'Manrope', sans-serif; line-height: 1.1; }
-    .tr-sum-row span { font-size: .74rem; color: #94a3b8; text-transform: uppercase; letter-spacing: .04em; }
-    .tr-sum-weak { margin: 8px 0 20px; color: #d97706; font-weight: 600; font-size: .92rem; }
-    .tr-sum-weak.tr-sum-good { color: #16a34a; }
+    .tr-summary::before { content: ''; position: absolute; left: 0; right: 0; top: 0; height: 6px; background: linear-gradient(90deg, var(--gold), var(--g2)); }
+    .tr-sum-h { margin: 6px 0 18px; font-family: 'Manrope', sans-serif; font-weight: 800; font-size: 1.35rem; color: var(--ink); }
+    .tr-sum-row { display: inline-flex; flex-direction: column; align-items: center; margin: 0 18px 12px; }
+    .tr-sum-row b { font-size: 1.9rem; font-weight: 800; font-family: 'Manrope', sans-serif; line-height: 1.1; background: linear-gradient(135deg, var(--g1), var(--g2)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
+    .tr-sum-row span { font-size: .72rem; color: var(--ink-faint); text-transform: uppercase; letter-spacing: .06em; font-weight: 700; }
+    .tr-sum-weak { margin: 10px 0 20px; color: var(--warn); font-weight: 600; font-size: .92rem; }
+    .tr-sum-weak.tr-sum-good { color: var(--ok-ink); }
 
     /* ── статистика ── */
-    .tr-stats { display: flex; gap: 20px; justify-content: center; margin: 22px 0 4px; }
+    .tr-stats { display: flex; gap: 28px; justify-content: center; margin: 24px 0 4px; }
     .tr-stat { text-align: center; }
-    .tr-stat b { display: block; font-size: 1.5rem; font-weight: 800; color: #4f46e5; font-family: 'Manrope', sans-serif; line-height: 1.1; }
-    .tr-stat span { font-size: .74rem; color: #94a3b8; text-transform: uppercase; letter-spacing: .04em; }
+    .tr-stat b { display: block; font-size: 1.7rem; font-weight: 800; font-family: 'Manrope', sans-serif; line-height: 1.1; background: linear-gradient(135deg, var(--g1), var(--g2)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
+    .tr-stat span { font-size: .72rem; color: var(--ink-faint); text-transform: uppercase; letter-spacing: .06em; font-weight: 700; }
 
-    .tr-note { margin-top: 24px; text-align: center; color: #94a3b8; font-size: .78rem; }
+    .tr-note { margin-top: 26px; text-align: center; color: var(--ink-faint); font-size: .78rem; line-height: 1.5; }
+
+    @media (max-width: 560px) {
+      .tr-wrap { padding: 22px 14px 70px; }
+      .tr-card { padding: 26px 18px 24px; }
+      .tr-inrow { flex-wrap: wrap; }
+      .tr-inrow .tr-btn { width: 100%; justify-content: center; }
+      .tr-stats { gap: 22px; }
+    }
+    @media (prefers-reduced-motion: reduce) {
+      * { animation-duration: .001ms !important; transition-duration: .001ms !important; }
+    }
   </style>
 </head>
 <body>
@@ -366,6 +434,7 @@
     setMath(eq, null, cur.display, true);   // условие как текст
     applyInputMode();
     var inp = $('tr-input'); inp.value = ''; inp.disabled = false;
+    var card = $('tr-card'); if (card) { card.classList.remove('tr-correct'); card.classList.remove('tr-wrong'); }
     setMode(false); inp.focus();
   }
   function genWordProblem() {
@@ -476,6 +545,7 @@
     inp.value = ''; inp.disabled = false;
     var fb = $('tr-feedback'); fb.className = 'tr-feedback'; fb.textContent = '';
     $('tr-solution').style.display = 'none'; $('tr-solution').innerHTML = '';
+    var card = $('tr-card'); if (card) { card.classList.remove('tr-correct'); card.classList.remove('tr-wrong'); }
     setMode(false);
     inp.focus();
   }
@@ -573,6 +643,7 @@
     if (r.ok) {
       solved++; streak++;
       fb.className = 'tr-feedback ok';
+      $('tr-card').classList.add('tr-correct');
       var lbl = (cur.kind === 'roots' || cur.kind === 'simplify') ? esc(answerLabel())
               : (kat('x = ' + cur.answer, false) || esc('x = ' + fmt(cur.answer)));
       fb.innerHTML = ICON.ok + ' <span>Верно!</span>&nbsp;' + lbl;
@@ -580,6 +651,7 @@
     } else {
       streak = 0;
       fb.className = 'tr-feedback bad'; fb.innerHTML = ICON.bad + ' Неверно. Разбери решение и реши похожую.';
+      $('tr-card').classList.add('tr-wrong');
       recordAnswer(false); submitAttempt(false);
       revealSolution();
     }