/* ПРЕМИУМ АПГРЕЙД ИНТЕРФЕЙСА (CYBER-GLASS & AURORA UI) */

body {
  background:
    radial-gradient(circle at 12% 15%, rgba(124, 92, 255, 0.22) 0%, transparent 42%),
    radial-gradient(circle at 88% 80%, rgba(255, 107, 74, 0.16) 0%, transparent 45%),
    linear-gradient(180deg, #08090e 0%, #0d1018 100%) !important;
  background-attachment: fixed !important;
}

/* Улучшенная верхняя панель с неоновым кантом */
.top-header {
  background: rgba(12, 15, 24, 0.78) !important;
  border-bottom: 1px solid rgba(124, 92, 255, 0.25) !important;
  box-shadow: 0 6px 28px rgba(0, 0, 0, 0.45);
}

.mascot-badge {
  background: linear-gradient(135deg, rgba(30, 35, 54, 0.9), rgba(18, 21, 34, 0.9)) !important;
  border: 1px solid rgba(124, 92, 255, 0.35) !important;
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.12), 0 4px 15px rgba(0, 0, 0, 0.3);
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.mascot-badge:active {
  transform: scale(0.94);
}

/* Продвинутые карточки предметов с бликом */
.subject-item {
  position: relative;
  overflow: hidden;
  background: linear-gradient(145deg, rgba(26, 31, 46, 0.88), rgba(17, 20, 30, 0.92)) !important;
  border: 1px solid rgba(255, 255, 255, 0.09) !important;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  padding: 20px 22px !important;
  border-radius: 22px !important;
}

.subject-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 5px;
  height: 100%;
  background: linear-gradient(180deg, #7c5cff, #ff6b4a);
  border-radius: 4px;
}

.subject-item:hover {
  border-color: rgba(124, 92, 255, 0.5) !important;
  box-shadow: 0 12px 28px rgba(124, 92, 255, 0.18);
}

/* Стеклянные блоки с мягким свечением */
.glass-card {
  background: linear-gradient(160deg, rgba(25, 30, 45, 0.85), rgba(15, 18, 28, 0.9)) !important;
  border: 1px solid rgba(255, 255, 255, 0.1) !important;
  border-radius: 22px !important;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.07) !important;
}

/* Кнопка "Объясни пятилетнему (ELI5)" под ответом ИИ */
.eli5-action-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px dashed rgba(255, 255, 255, 0.12);
}

.eli5-btn {
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.2), rgba(124, 92, 255, 0.25));
  border: 1px solid rgba(168, 85, 247, 0.45);
  color: #e9d5ff;
  font-size: 12px;
  font-weight: 600;
  padding: 5px 11px;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.18s ease;
}

.eli5-btn:active {
  transform: scale(0.95);
  background: rgba(168, 85, 247, 0.4);
}

/* Виджет-плитки для Мини-игр и Тренажёров PRO */
.pro-grid-hub {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 14px;
}

.pro-tile {
  background: linear-gradient(135deg, rgba(34, 40, 62, 0.9), rgba(20, 24, 38, 0.95));
  border: 1px solid rgba(124, 92, 255, 0.3);
  border-radius: 18px;
  padding: 14px 12px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.pro-tile:active {
  transform: scale(0.96);
  border-color: #ff6b4a;
}

.pro-tile-icon {
  font-size: 24px;
}

.pro-tile-title {
  font-size: 13.5px;
  font-weight: 700;
  color: #fff;
}

.pro-tile-sub {
  font-size: 11px;
  color: var(--text-muted);
}

/* Кнопки букв для тренажёра ударений */
.stress-letters-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  margin: 16px 0;
}

.letter-box {
  width: 38px;
  height: 44px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 19px;
  font-weight: 800;
  color: #fff;
  cursor: pointer;
  transition: all 0.15s ease;
}

.letter-box.vowel {
  border-color: rgba(124, 92, 255, 0.55);
  background: rgba(124, 92, 255, 0.15);
}

.letter-box.correct {
  background: #22c55e !important;
  border-color: #22c55e !important;
  transform: translateY(-4px);
}

.letter-box.wrong {
  background: #ef4444 !important;
  border-color: #ef4444 !important;
}

/* Парящий нижний док в стиле iOS / Telegram Premium */
.bottom-nav {
  bottom: 10px !important;
  left: 12px !important;
  right: 12px !important;
  border-radius: 22px !important;
  border: 1px solid rgba(255, 255, 255, 0.12) !important;
  background: rgba(15, 18, 28, 0.88) !important;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.65);
  padding: 8px 6px !important;
}

.nav-tab.active {
  background: rgba(124, 92, 255, 0.18);
  color: #b79eff !important;
}