:root {
  --bg-main: #0b0d13;
  --bg-card: rgba(22, 26, 38, 0.82);
  --bg-card-hover: rgba(32, 38, 56, 0.95);
  --border-glass: rgba(255, 255, 255, 0.08);
  --accent: #7c5cff;
  --accent-glow: rgba(124, 92, 255, 0.35);
  --accent-2: #ff6b4a;
  --success: #22c55e;
  --danger: #ef4444;
  --text-main: #f3f4f8;
  --text-muted: #8e96aa;
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  padding: 0;
  background: radial-gradient(circle at top right, #1a1635 0%, var(--bg-main) 55%);
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, sans-serif;
  min-height: 100vh;
  padding-bottom: 84px;
  overflow-x: hidden;
}

/* Шапка с маскотом и огоньком */
.top-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: rgba(11, 13, 19, 0.85);
  border-bottom: 1px solid var(--border-glass);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mascot-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  padding: 6px 12px;
  border-radius: 16px;
  cursor: pointer;
}

.mascot-avatar {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: linear-gradient(135deg, #2a244d, #191c29);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  position: relative;
  overflow: hidden;
}

.mascot-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.streak-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, rgba(255, 107, 74, 0.2), rgba(255, 168, 0, 0.15));
  border: 1px solid rgba(255, 107, 74, 0.4);
  padding: 7px 13px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 14px;
  color: #ff9d5c;
}

/* Стеклянные карточки и список предметов (как на твоём эскизе, но премиум) */
.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: 20px;
  padding: 16px;
  margin-bottom: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  transition: transform 0.18s ease, background 0.18s ease;
}

.subject-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  border-radius: 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  margin-bottom: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.subject-item:active {
  transform: scale(0.98);
  background: var(--bg-card-hover);
  border-color: var(--accent);
}

.subject-title {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.2px;
}

/* Чат и пузыри сообщений */
.chat-box {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 12px 0;
  max-height: calc(100vh - 230px);
  overflow-y: auto;
}

.msg-bubble {
  max-width: 88%;
  padding: 12px 15px;
  border-radius: 18px;
  line-height: 1.5;
  font-size: 14.5px;
  word-wrap: break-word;
}

.msg-user {
  align-self: flex-end;
  background: linear-gradient(135deg, #7c5cff, #5b3df5);
  color: #fff;
  border-bottom-right-radius: 4px;
}

.msg-ai {
  align-self: flex-start;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-bottom-left-radius: 4px;
}

/* Красивые таблицы для Заданий №1-5 (тарифы, трафик, шины, листы) */
.msg-ai table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0;
  font-size: 13px;
  background: rgba(11, 13, 19, 0.6);
  border-radius: 10px;
  overflow: hidden;
}

.msg-ai th, .msg-ai td {
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 8px 10px;
  text-align: left;
}

.msg-ai th {
  background: rgba(124, 92, 255, 0.25);
  font-weight: 700;
}

/* Карточка слитой шпаргалки (как на твоём скрине с №19 все типсы.pdf) */
.shpora-card {
  background: linear-gradient(135deg, #2a211d, #1f1916);
  border: 1px solid rgba(212, 163, 131, 0.28);
  border-radius: 18px;
  padding: 14px;
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.shpora-header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.shpora-icon {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: #8c6754;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: #fff;
  flex-shrink: 0;
}

/* Умный Словарь: карточка слова и сетка вариантов (2x3) */
.vocab-word-box {
  background: linear-gradient(145deg, rgba(124, 92, 255, 0.18), rgba(22, 26, 38, 0.9));
  border: 1px solid rgba(124, 92, 255, 0.35);
  border-radius: 24px;
  padding: 28px 18px;
  text-align: center;
  margin-bottom: 16px;
}

.vocab-options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.vocab-opt-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  padding: 15px 10px;
  border-radius: 16px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.18s ease;
}

.vocab-opt-btn.correct {
  background: rgba(34, 197, 94, 0.25);
  border-color: var(--success);
  color: #86efac;
}

.vocab-opt-btn.wrong {
  background: rgba(239, 68, 68, 0.25);
  border-color: var(--danger);
  color: #fca5a5;
}

/* Кнопки и инпуты */
.btn-primary {
  background: linear-gradient(135deg, #7c5cff, #6241ea);
  color: #fff;
  border: none;
  padding: 12px 18px;
  border-radius: 14px;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  box-shadow: 0 4px 14px var(--accent-glow);
}

.input-dark {
  width: 100%;
  background: rgba(15, 18, 28, 0.9);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  padding: 12px 14px;
  border-radius: 14px;
  font-size: 14px;
  outline: none;
}

.input-dark:focus {
  border-color: var(--accent);
}

/* Нижний TabBar */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: rgba(13, 16, 24, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--border-glass);
  display: flex;
  justify-content: space-around;
  padding: 8px 6px 12px;
}

.nav-tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  padding: 4px 10px;
  border-radius: 12px;
}

.nav-tab.active {
  color: var(--accent);
}

/* Круг дыхания анти-стресс */
@keyframes breatheAnim {
  0%, 100% { transform: scale(1); opacity: 0.7; }
  50% { transform: scale(1.45); opacity: 1; }
}
.breathe-circle {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  background: radial-gradient(circle, #7c5cff, #312070);
  margin: 24px auto;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  animation: breatheAnim 8s infinite ease-in-out;
}