@import url('https://fonts.googleapis.com/css2?family=Lora:wght@400;600;700&family=Montserrat:wght@400;500;600;700;800&display=swap');

/* =========================================
   1. ГЛОБАЛЬНЫЕ ПЕРЕМЕННЫЕ И БАЗА
   ========================================= */
:root {
  --cyan: #0ea5e9; --cyan-dark: #0284c7; --purple: #8b5cf6; --gold: #f59e0b;
  --bg: #f8fafc; --card: rgba(255, 255, 255, 0.85); --text: #0f172a; --muted: #64748b;
  --muted-dark: #475569; /* Новый цвет для контрастного текста */
  --border: #e2e8f0; --border-soft: rgba(226, 232, 240, 0.6);
  --shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.05), 0 4px 10px -2px rgba(0, 0, 0, 0.02);
  --shadow-hover: 0 20px 40px -5px rgba(14, 165, 233, 0.15), 0 10px 20px -5px rgba(0, 0, 0, 0.04);
  --radius: 24px; --radius-sm: 16px;
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.5);
  
  /* ДОБАВЛЕНО: Переменные для игр и проверки ответов */
  --success: #10b981;
  --danger: #ef4444;
  --success-bg: rgba(16, 185, 129, 0.1);
}

[data-theme="dark"] {
  --cyan: #38bdf8; --cyan-dark: #0ea5e9; --purple: #a78bfa; --gold: #fbbf24;
  --bg: #0b1120; --card: rgba(30, 41, 59, 0.6); --text: #f1f5f9; --muted: #94a3b8;
  --muted-dark: #cbd5e1; /* Версия для темной темы */
  --border: #334155; --border-soft: rgba(51, 65, 85, 0.5);
  --shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.5);
  --shadow-hover: 0 20px 40px -5px rgba(56, 189, 248, 0.15);
  --glass-bg: rgba(30, 41, 59, 0.6);
  --glass-border: rgba(255, 255, 255, 0.05);

  /* ДОБАВЛЕНО: Цвета для темной темы */
  --success: #34d399;
  --danger: #f87171;
  --success-bg: rgba(52, 211, 153, 0.15);
}

body {
  font-family: 'Montserrat', sans-serif; background-color: var(--bg); color: var(--text);
  line-height: 1.6; min-height: 100vh; display: flex; flex-direction: column;
  background-image: 
    radial-gradient(rgba(128, 128, 128, 0.25) 1.5px, transparent 1.5px),
    radial-gradient(circle at 15% 50%, rgba(14, 165, 233, 0.08), transparent 30%),
    radial-gradient(circle at 85% 30%, rgba(139, 92, 246, 0.08), transparent 30%);
  background-size: 30px 30px, 100% 100%, 100% 100%;
  background-attachment: fixed;
  margin: 0;
}
h1, h2, h3, h4 { font-family: 'Lora', serif; margin-bottom: 10px; }
a { color: var(--cyan-dark); text-decoration: none; }
#app { flex: 1; display: flex; flex-direction: column; }

main { 
  max-width: 1150px; margin: 0 auto; padding: 20px 20px 40px; width: 100%; 
  background: transparent; box-sizing: border-box;
}
::selection { background: var(--cyan); color: #fff; }

/* =========================================
   2. ГЛОБАЛЬНАЯ ШАПКА
   ========================================= */
header {
  background: var(--glass-bg); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-soft); box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
  color: var(--text); padding: 15px 20px; position: sticky; top: 0; z-index: 100;
}
.header-row { display: flex; align-items: center; gap: 10px 15px; max-width: 1150px; margin: 0 auto; flex-wrap: wrap; }
.header-title { font-family: 'Lora', serif; font-weight: 700; font-size: 22px; color: var(--text); white-space: nowrap; flex-shrink: 0; }
.back-btn {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--card); border: 1px solid var(--border);
  color: var(--text); padding: 8px 16px; border-radius: 20px;
  font-size: 14px; font-weight: 600; transition: all 0.2s; white-space: nowrap; flex-shrink: 0;
}
.back-btn:hover { background: var(--cyan); color: #fff; border-color: var(--cyan); }

.profile-btn, .theme-toggle {
  width: 40px; height: 40px; border-radius: 50%; background: var(--card);
  border: 1px solid var(--border); display: flex; align-items: center; justify-content: center;
  color: var(--text); cursor: pointer; transition: all 0.2s; flex-shrink: 0;
}
.profile-btn:hover, .theme-toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.profile-btn svg, .theme-toggle svg { width: 20px; height: 20px; stroke: currentColor; }

/* =========================================
   3. ГЛАВНАЯ СТРАНИЦА (HERO, КАРТОЧКИ)
   ========================================= */
.home-hero {
  background: linear-gradient(120deg, var(--card) 0%, var(--card) 100%);
  border-radius: var(--radius); padding: 40px;
  box-shadow: var(--shadow); border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 20px;
  margin-bottom: 40px; position: relative; overflow: hidden;
}
.home-hero::before {
  content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(14, 165, 233, 0.1), transparent 40%),
              radial-gradient(circle at 70% 50%, rgba(139, 92, 246, 0.1), transparent 40%);
  animation: aurora 10s ease-in-out infinite alternate; pointer-events: none; z-index: 0;
}
[data-theme="dark"] .home-hero::before {
  background: radial-gradient(circle at 30% 50%, rgba(56, 189, 248, 0.15), transparent 40%),
              radial-gradient(circle at 70% 50%, rgba(167, 139, 250, 0.15), transparent 40%);
}
.home-hero > * { position: relative; z-index: 1; }
@keyframes aurora {
  0% { transform: translate(-10%, -10%) scale(1); }
  100% { transform: translate(10%, 10%) scale(1.1); }
}
.home-hero h1 { font-size: 38px; font-weight: 700; margin-bottom: 10px; background: linear-gradient(90deg, var(--cyan), var(--purple)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.home-hero p { color: var(--muted-dark); font-size: 16px; font-weight: 500; }
#dynamic-quote { text-align: right; font-style: italic; font-size: 15px; color: var(--muted-dark); max-width: 400px; border-left: 3px solid var(--cyan); padding-left: 20px; }

/* НОВОЕ: Зеленая точка онлайн-статуса */
.online-dot {
  display: inline-block; width: 12px; height: 12px; background-color: var(--success);
  border-radius: 50%; margin-left: 12px; vertical-align: middle;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); animation: pulse-green 2s infinite;
}
@keyframes pulse-green {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.continue-learning {
  background: rgba(255, 255, 255, 0.5); backdrop-filter: blur(16px);
  border: 1px solid var(--cyan); border-left: 6px solid var(--cyan);
  border-radius: var(--radius); padding: 20px 30px; margin-bottom: 40px;
  display: flex; justify-content: space-between; align-items: center;
  box-shadow: 0 10px 25px -5px rgba(14, 165, 233, 0.15); transition: transform 0.3s ease;
}
[data-theme="dark"] .continue-learning { background: rgba(30, 41, 59, 0.4); }
.continue-learning:hover { transform: translateY(-3px); box-shadow: 0 15px 35px -5px rgba(14, 165, 233, 0.25); }
.cl-label { font-size: 12px; font-weight: 800; color: var(--cyan); text-transform: uppercase; letter-spacing: 1px; display: block; margin-bottom: 5px; }
.cl-title { font-size: 20px; font-weight: 800; color: var(--text); margin-bottom: 4px; }
.cl-subj { font-size: 14px; color: var(--muted-dark); font-weight: 600; }

.subjects-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; }
.subject-card {
  background: rgba(255, 255, 255, 0.45); backdrop-filter: blur(16px);
  border-radius: 18px; padding: 20px 15px; border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.04); display: flex; flex-direction: column; align-items: center; text-align: center;
  cursor: pointer; transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275); min-height: 175px; position: relative;
}
[data-theme="dark"] .subject-card { background: rgba(30, 41, 59, 0.35); border: 1px solid rgba(255, 255, 255, 0.08); }
.subject-card:hover { transform: translateY(-8px); box-shadow: 0 0 25px rgba(14, 165, 233, 0.2), 0 10px 30px -5px rgba(0, 0, 0, 0.1); border-color: var(--cyan); }
[data-theme="dark"] .subject-card:hover { box-shadow: 0 0 30px rgba(56, 189, 248, 0.3), 0 10px 30px -5px rgba(0, 0, 0, 0.5); }

.subj-icon-wrap { width: 54px; height: 54px; border-radius: 14px; display: flex; align-items: center; justify-content: center; margin-bottom: 12px; transition: transform 0.3s ease; box-shadow: inset 0 2px 5px rgba(0,0,0,0.02); }
.subject-card:hover .subj-icon-wrap { transform: scale(1.1) translateY(-3px); }
.subj-icon-wrap svg { width: 28px; height: 28px; }
.subj-info h3 { font-family: 'Montserrat', sans-serif; font-size: 15px; font-weight: 700; color: var(--text); margin-bottom: 10px; line-height: 1.3; }

.subj-progress-container { margin-top: auto; width: 100%; }
.subj-progress-text { display: flex; justify-content: space-between; font-size: 12px; color: var(--muted-dark); font-weight: 600; margin-bottom: 5px; letter-spacing: -0.2px; }
.subj-progress-text strong { font-size: 14px; color: var(--cyan); font-weight: 800; }
.subj-progress-bar { height: 6px; background: var(--border-soft); border-radius: 10px; overflow: hidden; box-shadow: inset 0 2px 4px rgba(0,0,0,0.1); }
.subj-progress-fill { height: 100%; background: linear-gradient(90deg, var(--cyan), var(--purple)); border-radius: 10px; position: relative; box-shadow: 0 0 10px rgba(14, 165, 233, 0.5); }
.subj-badge { margin-top: auto; background: var(--border-soft); color: var(--muted); font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: 1px; padding: 5px 12px; border-radius: 20px; border: 1px solid var(--border); }

/* =========================================
   4. СТРАНИЦА ПРЕДМЕТА (АККОРДЕОНЫ)
   ========================================= */
.subject-dashboard { background: var(--card); border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow); margin-bottom: 30px; text-align: center; backdrop-filter: blur(10px); border: 1px solid var(--glass-border); }
.dashboard-title { font-size: 24px; color: var(--text); margin-bottom: 25px; font-weight: 600; }
.grade-filters { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }
.grade-btn { background: var(--bg); border: 2px solid var(--border); color: var(--muted); padding: 10px 25px; border-radius: 20px; font-weight: 700; font-size: 15px; cursor: pointer; transition: all .2s; }
.grade-btn:hover:not(:disabled) { border-color: var(--cyan); color: var(--cyan); }
.grade-btn.active { background: var(--cyan); color: #fff; border-color: var(--cyan); box-shadow: 0 4px 15px rgba(14, 165, 233, 0.3); }
.grade-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.section-accordion { background: var(--card); border-radius: var(--radius-sm); box-shadow: var(--shadow); margin-bottom: 20px; border: 1px solid var(--border); overflow: hidden; }
.section-header { display: flex; align-items: center; gap: 15px; padding: 20px 25px; cursor: pointer; transition: background .2s; }
.section-header:hover { background: var(--border-soft); }
.section-animal { font-size: 28px; }
.section-title { font-family: 'Montserrat', sans-serif; font-size: 18px; font-weight: 700; color: var(--text); flex: 1; }
.section-count { background: var(--bg); border: 1px solid var(--border); color: var(--cyan); padding: 4px 12px; border-radius: 15px; font-size: 13px; font-weight: 700; }
.section-arrow { font-size: 14px; color: var(--muted); }
.section-content { display: none; padding: 0 25px 25px; border-top: 1px solid var(--border-soft); }
.section-accordion.open .section-content { display: block; }
.module-block { margin-top: 25px; }
.module-title { font-size: 15px; font-weight: 700; color: var(--muted); margin-bottom: 15px; text-transform: uppercase; letter-spacing: 0.5px; }
.lessons-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 15px; }
.lesson-card { background: var(--card); border-radius: 16px; padding: 20px; border: 1px solid var(--border); text-decoration: none; color: inherit; display: flex; flex-direction: column; transition: all 0.3s; }
.lesson-card.ready:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: var(--cyan); }
.lesson-card.pending { opacity: 0.6; cursor: not-allowed; background: var(--border-soft); }
.lc-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 15px; }
.lc-num { font-weight: 800; font-size: 14px; color: var(--cyan); background: rgba(14, 165, 233, 0.1); padding: 4px 10px; border-radius: 8px; }
.lc-badge { font-size: 11px; font-weight: 800; text-transform: uppercase; padding: 4px 10px; border-radius: 10px; background: var(--bg); color: var(--muted); }
.lc-badge.ready { background: var(--cyan); color: #fff; }
.lc-title { font-size: 16px; font-weight: 700; color: var(--text); line-height: 1.4; margin-bottom: 15px; flex: 1; }
.lc-meta { font-size: 13px; color: var(--cyan); font-weight: 700; }

/* =========================================
   5. ПРОФИЛЬ И МЕНТАЛЬНАЯ МАТЕМАТИКА
   ========================================= */
.card { background: var(--card); border-radius: var(--radius-sm); padding: 25px; margin-bottom: 20px; box-shadow: var(--shadow); border: 1px solid var(--border); }
.profile-header { background: linear-gradient(135deg, var(--cyan-dark) 0%, var(--purple) 100%); border-radius: var(--radius); padding: 40px; display: flex; align-items: center; gap: 30px; color: #fff; margin-bottom: 30px; box-shadow: 0 15px 30px rgba(139, 92, 246, 0.2); }
.prof-avatar { width: 100px; height: 100px; background: rgba(255,255,255,0.2); border: 3px solid #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 48px; flex-shrink: 0; backdrop-filter: blur(10px); }
.prof-info h2 { color: #fff; font-size: 32px; margin-bottom: 5px; }
.btn-edit-profile { margin-left: auto; background: #fff; color: var(--cyan-dark); border: none; padding: 12px 24px; border-radius: 12px; cursor: pointer; font-weight: 700; transition: 0.2s; }
.btn-edit-profile:hover { background: var(--bg); transform: translateY(-2px); }
.profile-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 25px; }
.prof-card { background: var(--card); border-radius: var(--radius); padding: 25px; border: 1px solid var(--border); box-shadow: var(--shadow); }
.stats-row { display: flex; justify-content: space-around; text-align: center; padding: 20px 0; }
.stat-val { font-size: 36px; font-weight: 800; color: var(--cyan); }
.stat-lbl { font-size: 14px; color: var(--muted); font-weight: 600; }
.achievements-grid { display: flex; flex-wrap: wrap; gap: 15px; }
.achievement-card { background: var(--bg); padding: 15px; border-radius: 12px; text-align: center; flex: 1; min-width: 120px; border: 1px solid var(--border); }
.ach-icons { font-size: 28px; margin-bottom: 10px; }
.ach-title { font-size: 13px; font-weight: 700; color: var(--text); }
.history-item { display: flex; align-items: center; gap: 20px; background: var(--bg); padding: 15px 25px; border-radius: 12px; margin-bottom: 12px; border: 1px solid var(--border); }
.hist-title { font-weight: 700; font-size: 16px; color: var(--text); }
.hist-mark { font-weight: 800; font-size: 20px; color: var(--success); }
.hist-mark.quiz-mark { color: var(--cyan); }
.hist-btn { background: var(--card); border: 1px solid var(--border); padding: 8px 16px; border-radius: 8px; font-size: 13px; font-weight: 600; transition: 0.2s; }
.hist-btn:hover { background: var(--cyan); color: #fff; border-color: var(--cyan); }

#mental-math-container { background: var(--card); border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow); border: 1px solid var(--border); margin-bottom: 30px; }
.mm-header { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border-soft); padding-bottom: 25px; margin-bottom: 25px; flex-wrap: wrap; gap: 20px; }
.mm-stats { display: flex; gap: 20px; font-weight: 800; font-size: 18px; color: var(--cyan); background: var(--bg); padding: 10px 25px; border-radius: 20px; border: 1px solid var(--border); }
.mm-levels { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 25px; }
.mm-lvl-btn { background: var(--bg); border: 1px solid var(--border); padding: 10px 20px; border-radius: 20px; font-weight: 700; font-size: 14px; color: var(--muted); cursor: pointer; transition: all 0.2s; }
.mm-lvl-btn:hover { border-color: var(--cyan); color: var(--cyan); }
.mm-lvl-btn.active { background: var(--cyan); color: #fff; border-color: var(--cyan); box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3); }
.mm-input { padding: 12px 20px; border: 2px solid var(--border); border-radius: 12px; font-size: 24px; text-align: center; font-weight: 800; background: var(--bg); color: var(--text); outline: none; max-width: 180px; transition: 0.2s; }
.mm-input:focus { border-color: var(--cyan); box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.1); }

/* =========================================
   6. СТРАНИЦА УРОКА (ШАПКА И КОНТЕНТ)
   ========================================= */
#lesson-root {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
  width: 100%;
  box-sizing: border-box;
}

/* Шапка урока */
.header-lesson {
  flex: 1 1 auto; min-width: 150px; font-size: 14px; color: var(--muted);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.timer {
  display: none;
  align-items: center; gap: 6px; background: var(--bg);
  padding: 6px 12px; border-radius: 12px; border: 1px solid var(--border);
  font-size: 13px; font-weight: 600; white-space: nowrap; flex-shrink: 0;
}
body.teacher-mode .timer, .timer.active { display: flex; }
.timer select, .timer button {
  background: var(--card); border: 1px solid var(--border); padding: 4px 8px;
  border-radius: 6px; color: var(--text); cursor: pointer; font-family: 'Montserrat', sans-serif; font-weight: 600;
}
.timer #timer-display { color: var(--cyan); font-weight: 800; }
.badges { display: flex; gap: 5px; align-items: center; flex-shrink: 0; }
.header-row > div:last-child { margin-left: auto; display: flex; gap: 10px; align-items: center; flex-shrink: 0; }

/* =========================================
   ВКЛАДКИ УРОКА (ИСПРАВЛЕНО)
   ========================================= */
nav.tabs {
  display: flex; 
  gap: 8px; 
  background: var(--card); 
  padding: 12px; 
  border-radius: 14px; 
  border: 1px solid var(--border); 
  margin: 0 auto 30px auto; 
  box-shadow: var(--shadow); 
  position: sticky; 
  top: 80px; 
  z-index: 50;
  max-width: 900px;
  
  /* ФИКС: Разрешаем перенос на новую строку и центрируем */
  flex-wrap: wrap !important;
  justify-content: center !important;
  overflow: visible !important;
  white-space: normal !important;
}

nav.tabs::-webkit-scrollbar { display: none; }

nav.tabs button { 
  background: transparent; border: none; padding: 8px 15px; border-radius: 10px; 
  font-family: 'Montserrat', sans-serif; font-weight: 600; font-size: 13px; 
  color: var(--muted); cursor: pointer; transition: all 0.2s ease; 
}
nav.tabs button:hover { background: var(--border-soft); color: var(--text); }

/* ФИКС: Синий цвет активной вкладки (перебиваем оранжевый) */
nav.tabs button[data-tab^="theory_tab_"].active,
nav.tabs button.active {
  background: var(--cyan) !important;
  color: #fff !important;
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3) !important;
}
nav.tabs button.teacher-tab { background: rgba(245, 158, 11, 0.1); color: var(--gold); }
nav.tabs button.teacher-tab.active { background: var(--gold) !important; color: #fff !important; }

/* ФИКС: Скрываем ВСЕ вкладки по умолчанию */
.lesson-content .tab { 
  display: none !important; 
  width: 100% !important;
}

/* ФИКС: Показываем ТОЛЬКО активную */
.lesson-content .tab.active { 
  display: block !important; 
  animation: fadeIn 0.3s ease-in-out; 
}

/* ФИКС: Чтобы карточки в инструментах не сплющивались */
.lesson-content .tab .card {
  display: block !important;
  width: 100% !important;
  max-width: 100% !important;
  box-sizing: border-box !important;
  margin-bottom: 20px !important;
}

@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* Общие стили карточек урока */
.card h2 { font-size: 24px; color: var(--text); margin-top: 0; margin-bottom: 15px; }
.card h3 { font-size: 18px; color: var(--text); margin-top: 20px; margin-bottom: 10px; }

/* ФИКС: Цифры в теории */
.card h3 .num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(14, 165, 233, 0.15);
  color: var(--cyan);
  font-size: 18px;
  font-weight: 800;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  margin-right: 12px;
  vertical-align: middle;
  line-height: 1;
}

/* =========================================
   7. ПРАКТИКУМ (ЗАДАЧИ, ПОДСКАЗКИ, РЕШЕНИЯ)
   ========================================= */
.task {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 25px; margin-bottom: 20px; box-shadow: 0 4px 10px rgba(0,0,0,0.02);
}
.task-condition { font-size: 16px; line-height: 1.6; margin-bottom: 15px; color: var(--text); }

/* Кнопки задач */
.task-controls { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 15px; }
.task-controls button {
  background: var(--bg); border: 2px solid var(--border); color: var(--text);
  padding: 8px 16px; border-radius: 10px; font-family: 'Montserrat', sans-serif;
  font-weight: 600; font-size: 14px; cursor: pointer; transition: all 0.2s ease;
}
.task-controls button:hover { border-color: var(--cyan); color: var(--cyan); }

/* МАГИЯ: Подсвечиваем кнопку, когда её блок открыт */
.task:has(.hint:not(.hidden)) .btn-hint,
.task:has(.another-example:not(.hidden)) .btn-example,
.task:has(.solution:not(.hidden)) .btn-solution {
  background: var(--cyan) !important; color: #fff !important; border-color: var(--cyan) !important;
  box-shadow: 0 4px 10px rgba(14, 165, 233, 0.3);
}

/* Выпадающие блоки */
.hint, .another-example, .solution {
  padding: 15px; border-radius: 10px; margin-top: 15px; font-size: 15px;
  line-height: 1.6; border-left: 4px solid transparent;
}
.hint { background: rgba(245, 158, 11, 0.1); border-left-color: var(--gold); }
.another-example { background: rgba(139, 92, 246, 0.1); border-left-color: var(--purple); }
.solution { background: rgba(14, 165, 233, 0.1); border-left-color: var(--cyan); }

/* Ввод ответа */
.answer-input { display: flex; gap: 10px; margin-top: 15px; align-items: center; flex-wrap: wrap; }
.answer-input input {
  background: var(--bg); border: 2px solid var(--border); color: var(--text);
  padding: 10px 15px; border-radius: 10px; font-family: 'Montserrat', sans-serif;
  font-size: 15px; outline: none; transition: border-color 0.2s;
}
.answer-input input:focus { border-color: var(--cyan); }

/* ФИКС: Все главные кнопки синие */
button.btn-primary, .btn-primary, .btn-check {
  background: var(--cyan) !important; color: #fff !important; border: none !important; padding: 10px 24px !important;
  border-radius: 10px !important; font-weight: 700 !important; cursor: pointer !important; transition: all 0.2s !important;
  font-family: 'Montserrat', sans-serif !important; font-size: 15px !important; display: inline-block !important;
}
button.btn-primary:hover, .btn-primary:hover, .btn-check:hover { 
  background: var(--cyan-dark) !important; transform: translateY(-2px) !important; 
}

#reset-btn {
  background: var(--danger) !important;
  background-color: var(--danger) !important;
}

/* =========================================
   8. ЗАЧЕТЫ И ТЕСТЫ
   ========================================= */
.test-levels { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 20px; }
.test-levels button {
  background: var(--bg); border: 2px solid var(--border); color: var(--muted);
  padding: 8px 16px; border-radius: 20px; font-weight: 600; cursor: pointer; transition: all 0.2s;
}
.test-levels button.active {
  background: var(--cyan); color: #fff; border-color: var(--cyan); box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}

/* =========================================
   9. РЕЖИМ УЧИТЕЛЯ И СКРЫТИЕ ЭЛЕМЕНТОВ
   ========================================= */
body:not(.teacher-mode) .teacher-tab,
body:not(.teacher-mode) .teacher-only-block,
body:not(.teacher-mode) .teacher-note { 
  display: none !important; 
}
body.teacher-mode .teacher-tab { display: inline-flex !important; }
.hidden { display: none !important; }

/* =========================================
   10. КАРТИНКИ, ВИДЕО, СПЕЦЭФФЕКТЫ
   ========================================= */
.lesson-img { width: 100%; max-width: 500px; height: auto; object-fit: contain; display: block; margin: 15px auto; border-radius: 8px; cursor: zoom-in; }
.lesson-img.wide { max-width: 100%; }
.fun-fact { background: rgba(255, 215, 0, 0.15); padding: 15px; border-radius: 8px; margin: 15px 0; border-left: 4px solid var(--gold); }
.video-container { position: relative; width: 100%; padding-bottom: 56.25%; height: 0; margin: 20px 0; border-radius: 8px; overflow: hidden; background: #000; }
.video-container iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: 0; }
.meadow { display: none !important; }

/* Сферы на фоне */
.bg-blob { position: fixed; border-radius: 50%; filter: blur(100px); z-index: -1; opacity: 0.4; pointer-events: none; animation: floatBlob 15s ease-in-out infinite alternate; }
.blob-1 { width: 400px; height: 400px; background: var(--cyan); top: -100px; left: -100px; }
.blob-2 { width: 500px; height: 500px; background: var(--purple); bottom: -150px; right: -150px; animation-delay: -5s; }
[data-theme="dark"] .bg-blob { opacity: 0.15; }
@keyframes floatBlob { 0% { transform: translate(0, 0) scale(1); } 100% { transform: translate(50px, 50px) scale(1.1); } }

/* =========================================
   11. АДАПТИВ (МОБИЛЬНЫЕ УСТРОЙСТВА)
   ========================================= */
@media (max-width: 768px) {
  .home-hero { flex-direction: column; text-align: center; padding: 25px; }
  #dynamic-quote { text-align: center; border-left: none; border-top: 2px solid var(--border-soft); padding-left: 0; padding-top: 20px; margin-top: 20px; }
  .profile-grid { grid-template-columns: 1fr; }
  .profile-header { flex-direction: column; text-align: center; padding: 30px; }
  .btn-edit-profile { margin-left: 0; margin-top: 20px; width: 100%; }
  .lessons-grid { grid-template-columns: 1fr; }
  
  .header-row { display: grid; grid-template-columns: auto 1fr auto auto; gap: 10px; align-items: center; }
  .header-lesson { grid-column: 1 / -1; text-align: center; margin-top: 5px; order: 10; }
  .timer { order: 11; justify-content: center; }
  .badges { grid-column: 1 / -1; justify-content: center; margin-top: 5px; order: 12; }
  .header-row > div:last-child { margin-left: 0; order: 4; }

  .continue-learning { flex-direction: column; text-align: center; gap: 15px; }
  .continue-learning .btn-primary { width: 100% !important; }
}

/* =========================================
   12. ДЕКОРАТИВНЫЕ УГОЛКИ И КНОПКА "ВЕРНУТЬСЯ"
   ========================================= */
.subject-card { position: relative; }

.subject-card::before,
.subject-card::after {
  content: '';
  position: absolute;
  width: 15px;
  height: 15px;
  border: 2px solid transparent;
  transition: all 0.3s ease;
  opacity: 0;
  pointer-events: none;
}

.subject-card:hover::before {
  top: 10px; left: 10px;
  border-top-color: var(--cyan); border-left-color: var(--cyan);
  opacity: 1;
}

.subject-card:hover::after {
  bottom: 10px; right: 10px;
  border-bottom-color: var(--cyan); border-right-color: var(--cyan);
  opacity: 1;
}

.continue-learning .btn-primary {
  background: linear-gradient(135deg, var(--cyan), var(--cyan-dark)) !important;
  color: #fff !important;
  padding: 14px 28px !important;
  border-radius: 14px !important;
  font-weight: 700 !important;
  font-size: 15px !important;
  letter-spacing: 0.5px !important;
  white-space: nowrap !important;
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  box-shadow: 0 8px 25px rgba(14, 165, 233, 0.25) !important;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) !important;
  border: none !important;
  text-decoration: none !important;
  animation: none !important;
}

.continue-learning .btn-primary:hover {
  transform: translateY(-3px) scale(1.02) !important;
  box-shadow: 0 12px 30px rgba(14, 165, 233, 0.4) !important;
  background: linear-gradient(135deg, var(--cyan-dark), var(--cyan)) !important;
}

/* =========================================
   ФИКС ЗАМКОВ И ОРАНЖЕВЫХ КНОПОК
   ========================================= */

/* 1. Прячем замок, если значок получен (earned) */
.badge-slot.earned .badge-lock {
    display: none !important;
}

/* 2. Принудительно делаем ВСЕ главные кнопки и ссылки синими */
button.btn-primary, 
a.btn-primary, 
.btn-primary,
.btn-check {
    background-color: var(--cyan) !important;
    background: var(--cyan) !important;
    color: #fff !important;
    border: none !important;
}

button.btn-primary:hover, 
a.btn-primary:hover, 
.btn-primary:hover {
    background-color: var(--cyan-dark) !important;
    background: var(--cyan-dark) !important;
    transform: translateY(-2px) !important;
}

/* =========================================
   ФИКС ПЕРЕКЛЮЧЕНИЯ ПРИМЕРОВ
   ========================================= */

/* 1. Скрываем все примеры по умолчанию */
.example-item {
    display: none !important;
}

/* 2. Показываем только активный пример */
.example-item.active {
    display: block !important;
    animation: fadeIn 0.3s ease-in-out;
}

/* 3. Делаем кнопку красивой, если она потерялась */
.example-box .btn-primary {
    margin-top: 15px;
}

/* =========================================
   ФИКС СТИЛЕЙ ДЛЯ КНОПОК В ВИЗУАЛИЗАЦИЯХ
   ========================================= */

/* Ловим все кнопки внутри блоков визуализации и карточек, у которых нет наших классов */
.visualization button,
.card button:not([class*="btn-"]):not(.active):not(.mm-lvl-btn):not(.grade-btn):not(.test-levels button):not(.status-btn) {
    background: var(--cyan) !important;
    color: #fff !important;
    border: none !important;
    padding: 8px 16px !important;
    border-radius: 8px !important;
    font-family: 'Montserrat', sans-serif !important;
    font-weight: 600 !important;
    font-size: 14px !important;
    cursor: pointer !important;
    transition: all 0.2s ease !important;
    margin-top: 10px !important;
    box-shadow: 0 4px 10px rgba(14, 165, 233, 0.2) !important;
}

/* Красивое поведение при наведении */
.visualization button:hover,
.card button:not([class*="btn-"]):not(.active):not(.mm-lvl-btn):not(.grade-btn):not(.test-levels button):not(.status-btn):hover {
    background: var(--cyan-dark) !important;
    transform: translateY(-2px) !important;
    box-shadow: 0 6px 15px rgba(14, 165, 233, 0.3) !important;
}

/* =========================================
   КАРТА ЗНАНИЙ (ЗВЕЗДНОЕ НЕБО)
   ========================================= */

.star-map-card {
    grid-column: 1 / -1;
    background: #0f172a; /* Темный фон для космоса */
    color: #fff;
    border: 1px solid #334155;
    overflow: hidden;
    position: relative;
    padding: 0 !important; /* Убираем отступы для полного погружения */
}

.star-map-header {
    position: absolute;
    top: 20px;
    left: 30px;
    z-index: 10;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(5px);
    padding: 15px 25px;
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.1);
}

.star-map-header h3 {
    margin: 0 0 5px 0;
    color: #fff;
    font-size: 22px;
    font-family: 'Lora', serif;
}

.star-map-header p {
    margin: 0;
    color: #94a3b8;
    font-size: 14px;
}

.star-map-canvas {
    width: 100%;
    height: 450px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Анимация мерцания звезд (ТОЛЬКО прозрачность, без изменения размера) */
@keyframes twinkle {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.twinkle {
    animation: twinkle 3s infinite ease-in-out;
}

/* На мобильных делаем карту чуть меньше */
@media (max-width: 768px) {
    .star-map-canvas {
        height: 300px;
    }
    .star-map-header {
        position: relative;
        top: 0; left: 0;
        background: transparent;
        backdrop-filter: none;
        border: none;
        padding: 20px 20px 0 20px;
    }
}

/* =========================================
   ИНДИКАТОРЫ ПРОЙДЕННЫХ УРОКОВ
   ========================================= */

/* Зеленая рамка для пройденного урока */
.lesson-card.completed-card {
    border-color: var(--success) !important;
    box-shadow: 0 0 15px rgba(16, 185, 129, 0.1) !important;
}

/* Плашка "Сдан" */
.lc-badge.completed {
    background: var(--success) !important;
    color: #fff !important;
    border-color: var(--success) !important;
}

/* =========================================
   ФИКС ДЛЯ КАРТИНОК-ИКОНОК ПРЕДМЕТОВ
   ========================================= */

/* Устанавливаем размеры для картинок, чтобы они не вылезали */
.subj-icon-wrap img {
    width: 32px !important; 
    height: 32px !important;
    object-fit: contain !important; /* Картинка не искажается */
    display: block;
}

/* =========================================
   УВЕЛИЧИВАЕМ ИКОНКИ ПРЕДМЕТОВ
   ========================================= */

/* 1. Увеличиваем высоту карточки, чтобы влезла большая иконка */
.subject-card {
    min-height: 260px !important; 
    padding-top: 30px !important;
}

/* 2. Делаем контейнер иконки большим и прозрачным */
.subj-icon-wrap {
    width: 140px !important;
    height: 140px !important;
    background: transparent !important; /* Убираем серый квадрат */
    box-shadow: none !important;
    border-radius: 0 !important;
    margin-bottom: 15px !important;
}

/* 3. Заставляем картинку заполнить весь контейнер */
.subj-icon-wrap img {
    width: 100% !important;
    height: 100% !important;
    object-fit: contain !important;
    /* Добавляем красивую тень, чтобы 3D-иконки "парили" над карточкой */
    filter: drop-shadow(0 12px 20px rgba(0,0,0,0.15)) !important; 
    transition: transform 0.3s ease !important;
}

/* 4. Усиливаем эффект при наведении */
.subject-card:hover .subj-icon-wrap img {
    transform: scale(1.1) translateY(-5px) !important;
}

/* =========================================
   МАТЕМАТИЧЕСКАЯ ЛАБОРАТОРИЯ
   ========================================= */
@keyframes fireGlow {
    0%, 100% { text-shadow: 0 0 5px rgba(249, 115, 22, 0.5); }
    50% { text-shadow: 0 0 15px rgba(249, 115, 22, 0.9); }
}

/* Дополнительный стиль для огонька серии */
.math-streak {
    animation: fireGlow 2s infinite;
}

/* =========================================
   СТИЛИ ДЛЯ СИЯНИЙ В ШАПКЕ
   ========================================= */
.shines-badge:hover {
    background: rgba(245, 158, 11, 0.2) !important;
    transform: translateY(-2px);
}
.shines-badge-value {
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    display: inline-block;
}