/* DESIGN.md tokens — 深色遊戲風 Dark Arcade */
:root {
  --bg: #0D0F1A;
  --surface: #1A1E2E;
  --primary: #4ADE80;
  --secondary: #A78BFA;
  --accent: #FB923C;
  --text: #F1F5F9;
  --text-dim: #94A3B8;
  --danger: #F87171;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  width: 100%;
  height: 100dvh;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

canvas { display: block; }

/* AR dom-overlay：session 期間 body 疊在鏡頭畫面上，必須透明才透得出相機 */
html.ar-active, body.ar-active { background: transparent; }
body:xr-overlay { background: transparent; }

.hidden { display: none !important; }

/* ── 覆蓋層 ── */
.overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 10;
  animation: overlay-in 250ms ease-out;
}

@keyframes overlay-in {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.card {
  background: rgba(26, 30, 46, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(241, 245, 249, 0.08);
  border-radius: 16px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  padding: 32px 28px;
  max-width: 420px;
  width: 100%;
  text-align: center;
}

.title {
  font-size: 32px;
  font-weight: 900;
  margin-bottom: 12px;
}

.desc {
  font-size: 15px;
  color: var(--text-dim);
  margin-bottom: 24px;
}

.final-score {
  font-size: 56px;
  font-weight: 900;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
  margin-bottom: 8px;
}

/* ── 按鈕 ── */
.btn {
  display: block;
  width: 100%;
  min-width: 240px;
  min-height: 48px;
  border: none;
  border-radius: 16px;
  font-size: 18px;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  margin-bottom: 12px;
  transition: transform 150ms ease, box-shadow 150ms ease;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--primary);
  color: #0D0F1A;
  box-shadow: 0 0 24px rgba(74, 222, 128, 0.35);
}

.btn-secondary {
  background: var(--secondary);
  color: #0D0F1A;
  box-shadow: 0 0 24px rgba(167, 139, 250, 0.35);
}

.note {
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.footer-note {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 8px;
}

/* ── HUD ── */
#hud {
  position: fixed;
  top: calc(12px + env(safe-area-inset-top));
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  padding: 0 16px;
  z-index: 5;
  pointer-events: none;
}

.badge {
  background: rgba(26, 30, 46, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 999px;
  padding: 8px 20px;
  font-size: 28px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.badge-score { color: var(--primary); }
.badge-timer { color: var(--text); }

.badge-timer.warning {
  color: var(--accent);
  animation: pulse 800ms ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}

/* ── 點擊浮字 ── */
.float-text {
  position: fixed;
  font-size: 24px;
  font-weight: 900;
  color: var(--primary);
  pointer-events: none;
  z-index: 6;
  animation: float-up 600ms ease-out forwards;
}

.float-text.combo { color: var(--accent); }

@keyframes float-up {
  from { opacity: 1; transform: translate(-50%, 0); }
  to   { opacity: 0; transform: translate(-50%, -48px); }
}

/* ── AR ── */
.ar-banner {
  position: fixed;
  top: calc(16px + env(safe-area-inset-top));
  left: 50%;
  transform: translateX(-50%);
  background: rgba(26, 30, 46, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 999px;
  padding: 10px 24px;
  font-size: 15px;
  z-index: 20;
  white-space: nowrap;
}

.ar-exit {
  position: fixed;
  top: calc(12px + env(safe-area-inset-top));
  right: 16px;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 999px;
  background: rgba(26, 30, 46, 0.72);
  color: var(--text);
  font-size: 20px;
  cursor: pointer;
  z-index: 21;
}

/* ── 減少動效 ── */
@media (prefers-reduced-motion: reduce) {
  .overlay, .float-text, .badge-timer.warning { animation: none; }
  .btn { transition: none; }
}