/* ABC's Start — kid-friendly, mobile-first */

:root {
  --bg: #FFF8E7;
  --card: #FFFFFF;
  --ink: #2D2A26;
  --ink-soft: #6B665E;
  --primary: #FFC107;       /* warm yellow */
  --primary-deep: #FFA000;
  --accent: #4FC3F7;        /* soft blue */
  --accent-deep: #0288D1;
  --good: #66BB6A;
  --warn: #FF7043;
  --shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --radius: 18px;
  --radius-sm: 12px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC",
               "Noto Sans TC", "Microsoft JhengHei", Roboto, sans-serif;
  background: var(--bg);
  color: var(--ink);
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
}

.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 16px 16px 48px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

/* ---------- Hero ---------- */
.hero {
  text-align: center;
  padding: 12px 8px 0;
}
.hero h1 {
  margin: 0;
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--primary-deep);
  text-shadow: 0 2px 0 rgba(255, 193, 7, 0.25);
}
.hero .subtitle {
  margin: 4px 0 0;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

/* ---------- Cards ---------- */
.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}
.card h2 {
  margin: 0 0 4px;
  font-size: 1.25rem;
  font-weight: 700;
}
.section-hint {
  margin: 0 0 14px;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

/* ---------- Player card ---------- */
.player-card {
  background: linear-gradient(135deg, #FFF3C4 0%, #FFFFFF 70%);
}
.player-header {
  margin-bottom: 16px;
}
.badge {
  display: inline-block;
  background: var(--primary);
  color: var(--ink);
  font-weight: 700;
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 8px;
  letter-spacing: 0.3px;
}
.player-hint {
  margin: 4px 0 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}
.player-body {
  display: flex;
  align-items: center;
  gap: 18px;
}
.play-btn {
  flex: 0 0 auto;
  width: 76px;
  height: 76px;
  border-radius: 50%;
  background: var(--primary);
  border: 4px solid #FFFFFF;
  box-shadow: 0 4px 12px rgba(255, 160, 0, 0.4);
  color: var(--ink);
  font-size: 1.8rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  padding-left: 6px; /* optical centering for ▶ */
}
.play-btn.playing { padding-left: 0; }
.play-btn:hover { transform: scale(1.04); }
.play-btn:active { transform: scale(0.96); }
.play-icon {
  display: inline-block;
  line-height: 1;
}

.progress-area {
  flex: 1 1 auto;
  min-width: 0;
}
.progress-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
  margin-bottom: 6px;
}
.progress-track {
  position: relative;
  height: 10px;
  background: rgba(0, 0, 0, 0.08);
  border-radius: 999px;
  cursor: pointer;
  outline: none;
  touch-action: manipulation;
}
.progress-fill {
  position: absolute;
  top: 0; left: 0; bottom: 0;
  width: 0%;
  background: linear-gradient(90deg, var(--primary) 0%, var(--primary-deep) 100%);
  border-radius: 999px;
  transition: width 0.1s linear;
}
.progress-handle {
  position: absolute;
  top: 50%;
  left: 0%;
  width: 18px;
  height: 18px;
  background: #FFFFFF;
  border: 3px solid var(--primary-deep);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
  transition: left 0.1s linear;
}

.player-actions {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}
.ghost-btn {
  flex: 1 1 0;
  background: rgba(0, 0, 0, 0.04);
  border: 1.5px solid transparent;
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
}
.ghost-btn:hover { background: rgba(0, 0, 0, 0.07); }
.ghost-btn:active { transform: scale(0.97); }
.ghost-btn.loop-on {
  background: rgba(255, 193, 7, 0.18);
  border-color: var(--primary);
  color: var(--primary-deep);
}

/* ---------- Chart card ---------- */
.chart-card { padding: 16px; }
.chart-wrap {
  position: relative;
  width: 100%;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: #FFFFFF;
  user-select: none;
}
.chart {
  display: block;
  width: 100%;
  height: auto;
  pointer-events: none;
}
.cell-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.cell {
  position: absolute;
  background: transparent;
  border: none;
  border-radius: 10px;
  padding: 0;
  margin: 0;
  cursor: pointer;
  pointer-events: auto;
  -webkit-tap-highlight-color: transparent;
  outline: none;
  transition: none;
}
.cell:focus,
.cell:active,
.cell:hover,
.cell.tapped {
  background: transparent;
  border: none;
  outline: none;
  transform: none;
}

/* ---------- Footer ---------- */
.foot {
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.8rem;
  padding: 8px 0 0;
}

/* ---------- Mobile tweaks ---------- */
@media (max-width: 480px) {
  .container { padding: 12px 12px 32px; gap: 14px; }
  .card { padding: 16px; }
  .hero h1 { font-size: 1.8rem; }
  .play-btn { width: 64px; height: 64px; font-size: 1.5rem; }
  .player-body { gap: 12px; }
}

/* ---------- Next level link ---------- */
.next-level-link {
  display: block;
  text-align: center;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-deep) 100%);
  color: #FFFFFF;
  text-decoration: none;
  font-size: 1.1rem;
  font-weight: 700;
  padding: 16px 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.next-level-link:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.next-level-link:active { transform: translateY(0); }