:root {
  --tv-bg0: #e8eef8;
  --tv-bg1: #f7f8fc;
  --tv-glass: rgba(255,255,255,0.72);
  --tv-glass-strong: rgba(255,255,255,0.82);
  --tv-border: rgba(30,40,70,0.12);
  --tv-specular: rgba(255,255,255,0.95);
  --tv-text: #1c1c28;
  --tv-dim: #6b7280;
  --tv-accent: #007aff;
  --tv-gold: #d97706;
  --tv-green: #16a34a;
  --tv-spring: cubic-bezier(0.25, 1.15, 0.3, 1);
  --tv-smooth: cubic-bezier(0.32, 0.72, 0, 1);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }
body {
  font-family: var(--font);
  color: var(--tv-text);
  background:
    radial-gradient(ellipse at 20% 0%, #dbeafe 0%, transparent 45%),
    radial-gradient(ellipse at 90% 10%, #fce7f3 0%, transparent 40%),
    linear-gradient(180deg, #f8fafc 0%, #e8eef8 100%);
  -webkit-font-smoothing: antialiased;
}
body::before {
  content: "";
  position: fixed;
  inset: -10%;
  background:
    radial-gradient(circle at 30% 40%, rgba(56,189,248,0.18), transparent 42%),
    radial-gradient(circle at 70% 70%, rgba(167,139,250,0.14), transparent 45%);
  animation: drift 20s ease-in-out infinite alternate;
  pointer-events: none;
  z-index: 0;
}
@keyframes drift {
  from { transform: translate3d(-1%, 0, 0); }
  to { transform: translate3d(1%, 1%, 0); }
}

#app { position: relative; z-index: 1; height: 100%; display: flex; flex-direction: column; }

.tv-topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 40px 6px; flex-shrink: 0;
}
.tv-brand { display: flex; align-items: center; gap: 14px; }
.tv-mark {
  width: 42px; height: 42px; border-radius: 14px;
  background: linear-gradient(145deg, #60a5fa, #a78bfa);
  box-shadow: 0 10px 28px rgba(96,165,250,0.45);
}
.tv-brand-name {
  font-size: 28px; font-weight: 700; letter-spacing: -0.03em;
  color: #0f172a;
}
.tv-task { font-size: 15px; color: var(--tv-dim); max-width: 40%; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tv-meta { display: flex; align-items: center; gap: 12px; }
.tv-pill {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 16px; border-radius: 999px;
  background: var(--tv-glass); border: 1px solid var(--tv-border);
  backdrop-filter: blur(20px); box-shadow: 0 8px 24px rgba(15,23,42,0.06);
}
.tv-pill.gold { border-color: rgba(217,119,6,0.25); background: rgba(255,247,237,0.9); }
.tv-pill .n { font-size: 20px; font-weight: 800; }
.badge-dot {
  min-width: 20px; height: 20px; border-radius: 10px; padding: 0 6px;
  background: #ef4444; color: #fff; font-size: 11px; font-weight: 700;
  display: grid; place-items: center;
}

.tv-home { flex: 1; min-height: 0; display: flex; flex-direction: column; padding: 10px 40px 24px; gap: 16px; }
.tv-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
  flex: 1; align-content: center;
}
.tv-tile {
  position: relative; aspect-ratio: 16/10; border: none; cursor: pointer; color: #0f172a;
  font: inherit; text-align: left; border-radius: 28px;
  background: rgba(255,255,255,0.75);
  border: 1px solid rgba(255,255,255,0.9);
  box-shadow: 0 16px 40px rgba(15,23,42,0.10), inset 0 1px 0 #fff;
  padding: 20px; display: flex; flex-direction: column; justify-content: flex-end;
  transform: scale(0.96); opacity: 0.88;
  transition: transform 0.32s var(--tv-spring), opacity 0.28s var(--tv-smooth), box-shadow 0.32s ease;
  overflow: hidden;
}
.tv-tile .icon {
  position: absolute; top: 18px; left: 18px; width: 48px; height: 48px; border-radius: 16px;
  display: grid; place-items: center; background: rgba(255,255,255,0.55); border: 1px solid rgba(255,255,255,0.8);
}
.tv-tile .label { position: relative; font-size: 22px; font-weight: 700; letter-spacing: -0.02em; }
.tv-tile .sub { position: relative; margin-top: 4px; font-size: 13px; color: var(--tv-dim); }
.tv-tile.focused, .tv-tile:focus-visible {
  outline: none; transform: scale(1.08); opacity: 1; z-index: 2;
  box-shadow: 0 0 0 3px rgba(255,255,255,0.95), 0 0 0 6px rgba(59,130,246,0.45), 0 28px 60px rgba(15,23,42,0.18);
}
.tv-tile.c-course { background: linear-gradient(145deg, #bfdbfe, #eff6ff); }
.tv-tile.c-english { background: linear-gradient(145deg, #bbf7d0, #f0fdf4); }
.tv-tile.c-browser { background: linear-gradient(145deg, #e9d5ff, #faf5ff); }
.tv-tile.c-shop { background: linear-gradient(145deg, #fde68a, #fffbeb); }
.tv-tile.c-chat { background: linear-gradient(145deg, #a5f3fc, #ecfeff); }
.tv-tile.c-record { background: linear-gradient(145deg, #fecaca, #fef2f2); }
.tv-tile.c-report { background: linear-gradient(145deg, #c7d2fe, #eef2ff); }
.tv-tile.c-help { background: linear-gradient(145deg, #e2e8f0, #f8fafc); }

.tv-caption {
  min-height: 52px; padding: 14px 22px; border-radius: 20px;
  background: rgba(255,255,255,0.7); border: 1px solid var(--tv-border);
  box-shadow: 0 10px 30px rgba(15,23,42,0.06);
}
.tv-caption h2 { font-size: 18px; font-weight: 700; }
.tv-caption p { font-size: 14px; color: var(--tv-dim); margin-top: 2px; }

.tv-scene { display: none; flex: 1; min-height: 0; flex-direction: column; padding: 8px 32px 24px; }
.tv-scene.active { display: flex; }
.scene-bar { display: flex; align-items: center; gap: 14px; margin-bottom: 12px; flex-shrink: 0; flex-wrap: wrap; }
.back-btn {
  border: none; cursor: pointer; color: #0f172a; padding: 10px 18px; border-radius: 14px;
  background: rgba(255,255,255,0.85); border: 1px solid var(--tv-border); font-size: 14px; font-weight: 650;
  box-shadow: 0 6px 16px rgba(15,23,42,0.06);
}
.back-btn:active { transform: scale(0.96); }
.scene-title { font-size: 30px; font-weight: 750; letter-spacing: -0.02em; color: #0f172a; }

.glass {
  background: var(--tv-glass-strong);
  backdrop-filter: blur(28px) saturate(160%);
  border: 1px solid var(--tv-border);
  border-radius: 24px;
  box-shadow: 0 18px 40px rgba(15,23,42,0.08), inset 0 1px 0 #fff;
}

.scene-body { flex: 1; min-height: 0; display: flex; gap: 16px; }

.video-list { width: 280px; overflow: auto; padding: 12px; display: flex; flex-direction: column; gap: 8px; flex-shrink: 0; }
.video-item {
  text-align: left; padding: 14px 16px; border-radius: 16px; color: #0f172a; cursor: pointer;
  background: rgba(255,255,255,0.65); border: 1px solid var(--tv-border);
}
.video-item.active { background: #dbeafe; border-color: #93c5fd; }
.player-shell {
  flex: 1; position: relative; border-radius: 24px; overflow: hidden; background: #0f172a;
  border: 1px solid rgba(15,23,42,0.12); box-shadow: 0 20px 50px rgba(15,23,42,0.15);
}
.player-glow { position: absolute; inset: -40px; filter: blur(60px); opacity: 0.35; pointer-events: none; background: radial-gradient(circle, rgba(56,189,248,0.5), transparent 70%); }
#courseVideo { position: relative; z-index: 1; width: 100%; height: 100%; object-fit: contain; }
.player-controls {
  position: absolute; left: 14px; right: 14px; bottom: 14px; z-index: 2;
  padding: 12px 14px; border-radius: 16px; display: flex; gap: 12px; align-items: center;
  opacity: 0; transform: translateY(10px); transition: 0.35s var(--tv-smooth); color: #fff;
}
.player-shell:hover .player-controls { opacity: 1; transform: none; }
.ctrl-btn { width: 40px; height: 40px; border-radius: 12px; border: 1px solid rgba(255,255,255,0.25); background: rgba(255,255,255,0.15); color: #fff; cursor: pointer; }
.progress-track { flex: 1; height: 6px; border-radius: 99px; background: rgba(255,255,255,0.2); cursor: pointer; overflow: hidden; }
.progress-fill { height: 100%; width: 0; background: linear-gradient(90deg, #38bdf8, #fff); }
.speed-select { background: rgba(0,0,0,0.35); color: #fff; border: 1px solid rgba(255,255,255,0.2); border-radius: 10px; padding: 6px 8px; }

.course-toolbar { display: flex; gap: 10px; margin-bottom: 10px; flex-wrap: wrap; }
.course-toolbar input {
  flex: 1; min-width: 160px; border: 1px solid var(--tv-border); border-radius: 12px; padding: 10px 12px;
  background: #fff; color: #0f172a;
}

.english-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; flex: 1; min-height: 0; }
.module-card { padding: 22px; display: flex; flex-direction: column; gap: 12px; overflow: auto; }
.waveform { display: flex; align-items: flex-end; gap: 4px; height: 64px; }
.wave-bar { flex: 1; border-radius: 4px; background: linear-gradient(180deg, #38bdf8, rgba(14,165,233,0.2)); height: 20%; }
.quiz-opt, .primary-btn {
  text-align: left; padding: 14px 16px; border-radius: 16px; color: #0f172a; cursor: pointer;
  background: rgba(255,255,255,0.8); border: 1px solid var(--tv-border);
}
.primary-btn { text-align: center; font-weight: 700; background: linear-gradient(135deg, #dbeafe, #fff); }
.quiz-opt.correct { border-color: var(--tv-green); background: #dcfce7; }
.quiz-opt.wrong { border-color: #ef4444; background: #fee2e2; }
.oral-sentence { font-size: 22px; padding: 16px; border-radius: 18px; background: rgba(255,255,255,0.75); }
.score-ring { font-size: 40px; font-weight: 800; color: var(--tv-accent); }

/* Browser with tabs */
.browser-chrome { display: flex; flex-direction: column; flex: 1; min-height: 0; gap: 10px; }
.tab-bar {
  display: flex; gap: 8px; align-items: center; overflow-x: auto; padding: 8px;
  background: rgba(255,255,255,0.7); border-radius: 16px; border: 1px solid var(--tv-border);
}
.tab-chip {
  display: flex; align-items: center; gap: 8px; padding: 8px 12px; border-radius: 12px;
  background: #fff; border: 1px solid var(--tv-border); cursor: pointer; white-space: nowrap; color: #0f172a;
}
.tab-chip.active { background: #dbeafe; border-color: #93c5fd; font-weight: 700; }
.tab-chip .x { border: none; background: transparent; cursor: pointer; color: #64748b; font-size: 14px; }
.browser-url {
  padding: 10px 16px; border-radius: 14px; font-size: 13px; color: var(--tv-dim);
  background: #fff; border: 1px solid var(--tv-border);
}
.site-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px; padding: 8px; overflow: auto; flex: 1;
}
.site-tile {
  padding: 20px; border-radius: 22px; cursor: pointer; color: #0f172a; text-align: left;
  background: rgba(255,255,255,0.85); border: 1px solid var(--tv-border);
  box-shadow: 0 12px 28px rgba(15,23,42,0.06); transition: transform 0.28s var(--tv-spring);
}
.site-tile:hover, .site-tile:focus { transform: scale(1.04); outline: none; }
.browser-frame-wrap { flex: 1; min-height: 0; display: none; place-items: center; }
.browser-frame-wrap.active { display: grid; }
.browser-open-hint { max-width: 520px; padding: 28px 32px; text-align: center; }

.shop-rail { flex: 1; overflow: auto; padding: 12px; }
.shop-row-title { font-size: 18px; margin: 8px 0 12px; color: var(--tv-dim); }
.shop-row { display: flex; gap: 16px; overflow-x: auto; padding-bottom: 16px; }
.shop-card {
  min-width: 240px; padding: 20px; border-radius: 22px; cursor: pointer;
  background: rgba(255,255,255,0.88); border: 1px solid var(--tv-border);
  transition: transform 0.28s var(--tv-spring);
}
.shop-card:hover { transform: scale(1.04); }
.shop-card h3 { font-size: 20px; margin-bottom: 8px; }
.shop-card p { font-size: 13px; color: var(--tv-dim); min-height: 40px; }
.shop-price { margin-top: 14px; color: var(--tv-gold); font-size: 22px; font-weight: 800; }

.chat-wrap { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.chat-list { flex: 1; overflow: auto; padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.bubble { max-width: 70%; padding: 12px 16px; border-radius: 20px; font-size: 15px; line-height: 1.45; word-break: break-word; }
.bubble.child { align-self: flex-end; background: linear-gradient(135deg, #2563eb, #38bdf8); color: #fff; border-bottom-right-radius: 6px; }
.bubble.parent { align-self: flex-start; background: #fff; border: 1px solid var(--tv-border); border-bottom-left-radius: 6px; }
.bubble.system { align-self: center; background: transparent; color: var(--tv-dim); font-size: 12px; }
.bubble .time { display: block; margin-top: 4px; font-size: 11px; opacity: 0.7; }
.chat-input { display: flex; gap: 10px; padding: 12px; border-top: 1px solid rgba(15,23,42,0.06); align-items: stretch; }
.chat-input input {
  flex: 1; border: 1px solid var(--tv-border); outline: none; border-radius: 16px; padding: 14px 16px;
  background: #fff; color: #0f172a; font-size: 16px;
}
.chat-input button {
  border: none; border-radius: 16px; min-width: 96px; padding: 0 22px; cursor: pointer; color: #fff;
  font-weight: 700; font-size: 16px; background: #2563eb;
  box-shadow: 0 8px 20px rgba(37,99,235,0.3);
}
.chat-input button:disabled { opacity: 0.5; cursor: not-allowed; }

.rec-stage { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 20px; padding: 24px; }
.rec-status-pill {
  padding: 8px 18px; border-radius: 999px; font-size: 14px; font-weight: 700; letter-spacing: 0.04em;
  background: rgba(255,255,255,0.75); border: 1px solid var(--tv-border); color: var(--tv-dim);
}
.rec-status-pill.recording { color: #dc2626; border-color: rgba(239,68,68,0.35); background: #fef2f2; }
.rec-status-pill.uploading { color: #2563eb; border-color: rgba(37,99,235,0.25); background: #eff6ff; }
.rec-status-pill.done { color: #16a34a; border-color: rgba(22,163,74,0.25); background: #f0fdf4; }
.rec-status-pill.error { color: #b91c1c; border-color: rgba(185,28,28,0.25); background: #fef2f2; }
.rec-timer { font-size: 64px; font-weight: 750; letter-spacing: -0.03em; color: #0f172a; font-variant-numeric: tabular-nums; }
.rec-wave { width: min(640px, 90%); height: 80px; display: flex; align-items: flex-end; gap: 3px; }
.rec-btn {
  width: 88px; height: 88px; border-radius: 50%; border: 3px solid rgba(239,68,68,0.35);
  background: #ef4444; cursor: pointer; box-shadow: 0 12px 40px rgba(239,68,68,0.35);
  transition: transform 0.2s var(--tv-smooth), opacity 0.2s;
}
.rec-btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }
.rec-btn.recording { animation: pulse 1.2s ease infinite; }
.rec-actions { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }
.rec-secondary-btn {
  border: 1px solid var(--tv-border); background: rgba(255,255,255,0.85); color: #0f172a;
  border-radius: 16px; padding: 12px 22px; font-size: 15px; font-weight: 650; cursor: pointer;
}
.rec-secondary-btn:hover { background: #fff; }
@keyframes pulse { 50% { transform: scale(1.08); } }

.parent-msg-alert {
  position: fixed; inset: 0; z-index: 1200; display: none; place-items: center;
  background: rgba(15,23,42,0.45); backdrop-filter: blur(18px);
}
.parent-msg-alert.show { display: grid; animation: fadeIn 0.35s ease; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.parent-msg-card {
  width: min(560px, 92vw); padding: 36px 32px 28px; text-align: center;
  border-radius: 28px; box-shadow: 0 24px 80px rgba(15,23,42,0.25);
}
.parent-msg-icon { font-size: 52px; line-height: 1; margin-bottom: 8px; }
.parent-msg-label { font-size: 15px; font-weight: 700; color: var(--tv-dim); letter-spacing: 0.06em; text-transform: uppercase; }
.parent-msg-body {
  margin: 18px 0 24px; font-size: clamp(22px, 4vw, 32px); font-weight: 750; line-height: 1.35;
  color: #0f172a; word-break: break-word;
}
.parent-msg-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.help-card { padding: 28px; max-width: 720px; margin: 20px auto; line-height: 1.7; color: var(--tv-dim); }
.help-card h3 { color: #0f172a; margin: 16px 0 8px; }
.metric-big { font-size: 56px; font-weight: 800; color: var(--tv-gold); text-align: center; margin: 20px 0; }

.afk-overlay { position: fixed; inset: 0; z-index: 1000; display: none; place-items: center; background: rgba(15,23,42,0.35); backdrop-filter: blur(16px); }
.afk-overlay.show { display: grid; }
.afk-card { padding: 32px 40px; text-align: center; max-width: 420px; }
.banner-toast {
  position: fixed; top: 80px; left: 50%; transform: translateX(-50%) translateY(-20px); z-index: 1100;
  padding: 18px 36px; border-radius: 20px; font-size: 26px; font-weight: 700; color: #0f172a;
  opacity: 0; pointer-events: none; transition: 0.5s var(--tv-smooth);
}
.banner-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.muted { color: var(--tv-dim); font-size: 13px; }
.error-box { color: #b91c1c; background: #fee2e2; border: 1px solid #fecaca; padding: 12px 14px; border-radius: 14px; margin: 8px 0; }

@media (max-width: 1100px) {
  .tv-grid { grid-template-columns: repeat(2, 1fr); }
  .tv-task { display: none; }
}