:root {
  --bg: #0f1428;
  --bg-soft: #161c38;
  --surface: #1c2348;
  --surface-2: #232b57;
  --border: rgba(255, 255, 255, 0.09);
  --ink: #eef1fb;
  --ink-dim: #a7aed4;
  --accent: #7c9cff;
  --accent-strong: #5b7cff;
  --gold: #ffb454;
  --good: #4ade80;
  --bad: #f87171;
  --font-display: "Sora", "Inter", sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
}

* { box-sizing: border-box; }

/* Атрибут [hidden] по умолчанию легко перебивается любым авторским
   правилом с display (например .chat-history{display:flex}) — фиксируем
   явно, чтобы скрытые по умолчанию блоки (текст лекции, субтитры, статус
   микрофона) действительно не показывались, пока JS их не откроет. */
[hidden] { display: none !important; }

html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.wrap { max-width: 960px; margin: 0 auto; padding: 0 20px; }

h1, h2, h3 { font-family: var(--font-display); color: #fff; font-weight: 600; margin: 0 0 .4em; }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--gold); }

p { color: var(--ink-dim); }

.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(15, 20, 40, 0.85);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  flex-wrap: wrap;
  gap: 10px;
}
.brand { display: flex; align-items: center; gap: 8px; font-family: var(--font-display); font-weight: 700; font-size: 1.1rem; color: var(--ink); }
.brand__mark { font-size: 1.3rem; }
.account-nav { display: flex; align-items: center; gap: 14px; font-size: .92rem; }
.account-nav__unconfirmed { color: var(--gold); font-size: .82rem; }

.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 100px;
  background: var(--accent-strong);
  color: #fff;
  font-weight: 600;
  font-size: .95rem;
  border: none;
  cursor: pointer;
}
.btn:hover { background: var(--accent); color: #fff; }
.btn--small { padding: 8px 16px; font-size: .85rem; }
.btn--secondary { background: var(--surface-2); color: var(--ink); }
.btn--secondary:hover { background: var(--surface); color: var(--ink); }
.btn--gold { background: var(--gold); color: #201400; }
.btn--gold:hover { background: #ffc57a; color: #201400; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.site-main { flex: 1; padding: 20px 0 60px; }

.flash-messages { margin: 16px auto 0; display: flex; flex-direction: column; gap: 8px; }
.flash { padding: 12px 16px; border-radius: 10px; font-size: .92rem; }
.flash--error { background: rgba(248, 113, 113, 0.14); border: 1px solid rgba(248, 113, 113, 0.3); color: #ffc9c9; }
.flash--success { background: rgba(74, 222, 128, 0.12); border: 1px solid rgba(74, 222, 128, 0.3); color: #bbf7d0; }
.flash--info { background: rgba(124, 156, 255, 0.12); border: 1px solid rgba(124, 156, 255, 0.3); color: #cdd9ff; }

.card {
  background: linear-gradient(160deg, var(--surface), var(--bg-soft));
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 22px;
}

.hero { text-align: center; padding: 60px 0 30px; }
.hero .eyebrow { text-transform: uppercase; letter-spacing: .16em; font-size: .75rem; color: var(--gold); }
.hero h1 { font-size: clamp(2rem, 5vw, 2.8rem); margin: .3em 0; }
.hero p { max-width: 560px; margin: 0 auto 24px; font-size: 1.05rem; }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin: 40px 0; }
.feature-grid .card h3 { font-size: 1.05rem; }
.feature-grid .card p { font-size: .92rem; margin: 0; }

form.form-card { display: flex; flex-direction: column; gap: 14px; max-width: 420px; margin: 30px auto; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: .88rem; color: var(--ink-dim); }
.field input, .field select, .field textarea {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--ink);
  padding: 11px 14px;
  border-radius: 10px;
  font-size: .96rem;
  font-family: inherit;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid var(--accent); }
.form-note { font-size: .84rem; color: var(--ink-dim); text-align: center; }

.subject-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 14px; margin: 24px 0; }
.subject-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  cursor: pointer;
}
.subject-card input { position: absolute; opacity: 0; }
.subject-card:has(input:checked) { border-color: var(--accent); background: var(--surface-2); box-shadow: 0 0 0 2px var(--accent) inset; }
.subject-card h3 { margin: 0 0 4px; font-size: 1rem; }
.subject-card span { color: var(--ink-dim); font-size: .85rem; }

.voice-list { display: flex; flex-direction: column; gap: 8px; max-height: 260px; overflow-y: auto; }
.voice-option { display: flex; align-items: center; gap: 10px; background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 8px 12px; }
.voice-option label { flex: 1; font-size: .88rem; cursor: pointer; }

.topic-list { list-style: none; padding: 0; margin: 20px 0; display: flex; flex-direction: column; gap: 8px; }
.topic-list li { display: flex; align-items: center; gap: 10px; background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 10px 14px; }
.topic-list li.is-completed { opacity: .6; }
.topic-list .topic-status { margin-left: auto; font-size: .78rem; padding: 2px 10px; border-radius: 100px; background: var(--surface-2); color: var(--ink-dim); }
.topic-list .topic-status--completed { background: rgba(74, 222, 128, 0.16); color: var(--good); }
.topic-list .topic-status--in_progress { background: rgba(255, 180, 84, 0.16); color: var(--gold); }

.dashboard-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 20px; margin-top: 24px; }
@media (max-width: 720px) { .dashboard-grid { grid-template-columns: 1fr; } }

.progress-bar { height: 8px; border-radius: 100px; background: var(--surface-2); overflow: hidden; margin: 10px 0 18px; }
.progress-bar__fill { height: 100%; background: linear-gradient(90deg, var(--accent), var(--gold)); }

/* --- Аватар репетитора: процедурное 2D-лицо на inline SVG ---
   Рот/глаза/лёгкое покачивание анимируются через CSS-классы, которые
   переключает app/static/js/tts.js (синхронно с речью) — см. комментарий
   в начале этого файла про ограничения SpeechSynthesis + Web Audio API. */
.avatar-widget {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  margin: 18px auto;
  width: fit-content;
  text-align: center;
}
.avatar-face-wrap {
  animation: avatar-sway 4.5s ease-in-out infinite;
  transform-origin: 50% 100%;
}
.avatar-widget.is-nodding .avatar-face-wrap {
  animation: avatar-nod .6s ease-in-out 1;
}
@keyframes avatar-sway {
  0%, 100% { transform: rotate(-1.4deg); }
  50% { transform: rotate(1.4deg); }
}
@keyframes avatar-nod {
  0% { transform: translateY(0) rotate(0); }
  30% { transform: translateY(-5px) rotate(-2deg); }
  60% { transform: translateY(2px) rotate(1.5deg); }
  100% { transform: translateY(0) rotate(0); }
}

.avatar-face__head { fill: var(--avatar-color, var(--accent)); }
.avatar-face__eye-white { fill: #fff; }
.avatar-face__pupil { fill: #24243a; }
.avatar-face__eyelid {
  fill: var(--avatar-color, var(--accent));
  transform-box: fill-box;
  transform-origin: top;
  transform: scaleY(0);
  transition: transform .07s ease;
}
.avatar-widget.is-blinking .avatar-face__eyelid { transform: scaleY(1); }

.avatar-face__mouth { fill: #24243a; display: none; }
.avatar-widget.mouth-closed .avatar-face__mouth--closed,
.avatar-widget.mouth-mid .avatar-face__mouth--mid,
.avatar-widget.mouth-open .avatar-face__mouth--open { display: block; }

.avatar-widget__name { font-weight: 600; color: var(--ink); margin-top: 2px; }
.avatar-widget__mic-status { font-size: .82rem; color: var(--gold); min-height: 1.2em; }
.avatar-widget__subtitle {
  max-width: 420px;
  font-size: .92rem;
  color: var(--ink-dim);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 14px;
  margin: 4px 0 0;
}

.lesson-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.debug-toggles { display: flex; gap: 8px; flex-wrap: wrap; }
.debug-toggle {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink-dim);
  border-radius: 100px;
  padding: 6px 14px;
  font-size: .8rem;
  cursor: pointer;
}
.debug-toggle:hover { color: var(--ink); }
.debug-toggle.is-active { background: var(--accent-strong); color: #fff; border-color: transparent; }

/* --- Диаграммы и графики на доске --- */
.board__content--rich { color: #1a1a2e; }
.diagram-row { display: flex; align-items: center; flex-wrap: wrap; gap: 4px; }
.diagram-node {
  background: #eef1fb;
  border: 1px solid #d8d8ea;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: .92rem;
  font-weight: 600;
}
.diagram-arrow { color: #7c7ca0; font-size: .82rem; padding: 0 4px; white-space: nowrap; }
.diagram-extra-edges { margin: 14px 0 0; padding-left: 18px; color: #4a4a68; font-size: .88rem; }

/* --- Занятие: доска + чат --- */
.lesson-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 18px;
  margin-top: 16px;
  align-items: start;
}
@media (max-width: 860px) {
  .lesson-layout { grid-template-columns: 1fr; }
}

.board {
  background: #fff;
  color: #1a1a2e;
  border-radius: 16px;
  padding: 26px;
  min-height: 260px;
  position: sticky;
  top: 80px;
}
.board__type { font-size: .72rem; text-transform: uppercase; letter-spacing: .1em; color: #7c7ca0; margin-bottom: 10px; }
.board__content { white-space: pre-wrap; font-size: 1.05rem; line-height: 1.7; }
.board__empty { color: #9797b8; font-style: italic; }

.chat-panel { display: flex; flex-direction: column; gap: 14px; }
.chat-history { display: flex; flex-direction: column; gap: 12px; max-height: 55vh; overflow-y: auto; padding-right: 4px; }
.chat-bubble { padding: 12px 16px; border-radius: 14px; font-size: .95rem; max-width: 100%; white-space: pre-wrap; }
.chat-bubble--tutor { background: var(--surface); border: 1px solid var(--border); align-self: flex-start; }
.chat-bubble--student { background: var(--accent-strong); color: #fff; align-self: flex-end; }
.chat-bubble img { max-width: 100%; border-radius: 10px; margin-top: 8px; display: block; }
.chat-bubble__meta { font-size: .72rem; opacity: .65; margin-bottom: 4px; }

.chat-input-area { border-top: 1px solid var(--border); padding-top: 14px; }
.chat-input-row { display: flex; gap: 10px; margin-top: 8px; }
.chat-input-row .btn { flex-shrink: 0; }

.awaiting-hint { font-size: .82rem; color: var(--gold); margin-bottom: 8px; }

.task-list { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.task-pill { font-size: .78rem; padding: 4px 10px; border-radius: 100px; background: var(--surface-2); color: var(--ink-dim); }
.task-pill--correct { background: rgba(74, 222, 128, 0.16); color: var(--good); }
.task-pill--incorrect { background: rgba(248, 113, 113, 0.16); color: var(--bad); }
.task-pill--pending { background: rgba(124, 156, 255, 0.16); color: var(--accent); }

.schedule-form { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; margin-top: 10px; }

.site-footer { text-align: center; padding: 30px 0; color: var(--ink-dim); font-size: .85rem; border-top: 1px solid var(--border); }