.song-player-page {
  --sp-accent: #4f46e5;
  --sp-chord: #b45309;
  --sp-bg: #fafafa;
  --sp-surface: #fff;
  --sp-border: #e5e7eb;
  --sp-muted: #6b7280;
  min-height: 100vh;
  background: var(--sp-bg);
  color: #111827;
  font-family: "PingFang TC", "Heiti TC", system-ui, sans-serif;
}

.song-topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--sp-border);
  backdrop-filter: blur(8px);
}

.song-back {
  color: var(--sp-accent);
  text-decoration: none;
  font-size: 0.85rem;
  white-space: nowrap;
}

.song-topbar-title {
  flex: 1;
  font-size: 0.95rem;
  font-weight: 700;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.song-topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
}

.song-topbar-btn {
  border: 1px solid var(--sp-border);
  background: var(--sp-surface);
  border-radius: 10px;
  min-width: 2.25rem;
  height: 2.25rem;
  padding: 0 0.45rem;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--sp-muted);
  cursor: pointer;
  font-family: inherit;
}

.song-topbar-btn.is-active,
.song-simplify-btn.is-on {
  background: #eef2ff;
  border-color: var(--sp-accent);
  color: var(--sp-accent);
}

.song-simplify-btn {
  font-size: 0.72rem;
  min-width: 2.5rem;
}

.song-action-sheets {
  position: sticky;
  top: 2.6rem;
  z-index: 38;
  background: var(--sp-bg);
}

/* —— Pany-style transpose bar —— */
.song-transpose-bar {
  position: sticky;
  top: 2.6rem;
  z-index: 39;
  margin: 0;
  padding: 0.55rem 0.65rem 0.65rem;
  background: rgba(255, 255, 255, 0.97);
  border-bottom: 1px solid var(--sp-border);
  backdrop-filter: blur(10px);
}

.song-transpose-bar[hidden] {
  display: none !important;
}

.song-transpose-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.5rem;
}

.song-compact-ctrl {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  padding: 0.25rem 0.4rem;
  border-radius: 12px;
  background: #f8fafc;
  border: 1px solid var(--sp-border);
}

.song-compact-ctrl--transpose {
  border-color: #c7d2fe;
  background: #eef2ff;
}

.song-compact-ctrl--capo {
  border-color: #fed7aa;
  background: #fff7ed;
}

.song-compact-label {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--sp-muted);
  padding-right: 0.15rem;
}

.song-compact-val {
  min-width: 2.5rem;
  text-align: center;
  font-size: 0.82rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.song-circle-btn {
  width: 2.1rem;
  height: 2.1rem;
  border: none;
  border-radius: 50%;
  background: #fff;
  color: var(--sp-accent);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.song-circle-btn--capo {
  color: #c2410c;
}

.song-transpose-divider {
  width: 1px;
  height: 1.75rem;
  background: var(--sp-border);
  flex-shrink: 0;
}

.song-transpose-reset {
  margin-left: auto;
  border: none;
  background: transparent;
  color: var(--sp-muted);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.35rem 0.5rem;
}

.song-transpose-reset[hidden] {
  display: none;
}

.song-transpose-fold {
  border: none;
  background: #f3f4f6;
  color: var(--sp-muted);
  width: 2rem;
  height: 2rem;
  border-radius: 8px;
  font-size: 0.7rem;
  cursor: pointer;
  flex-shrink: 0;
}

.song-key-panel {
  margin-top: 0.5rem;
  padding: 0.55rem 0.65rem;
  background: #f8fafc;
  border: 1px solid var(--sp-border);
  border-radius: 12px;
  font-size: 0.72rem;
  line-height: 1.4;
}

.song-key-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.5rem;
}

.song-key-step {
  font-weight: 700;
  color: #111827;
}

.song-key-step--muted {
  color: var(--sp-muted);
  font-weight: 600;
}

.song-key-arrow {
  color: #9ca3af;
  font-weight: 600;
}

.song-key-capo-badge {
  margin-left: auto;
  padding: 0.15rem 0.45rem;
  border-radius: 6px;
  background: #fff7ed;
  color: #c2410c;
  font-weight: 700;
  font-size: 0.68rem;
}

/* —— Song info card (pany badges) —— */
.song-info-card {
  margin-bottom: 0.85rem;
  padding: 0.85rem 0.9rem;
  background: var(--sp-surface);
  border: 1px solid var(--sp-border);
  border-radius: 16px;
  box-shadow: 0 1px 4px rgba(17, 24, 39, 0.04);
}

.song-info-card[hidden] {
  display: none !important;
}

.song-info-title {
  margin: 0 0 0.2rem;
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.25;
}

.song-info-artist {
  margin: 0 0 0.55rem;
  font-size: 0.82rem;
  color: var(--sp-muted);
}

.song-info-artist[hidden] {
  display: none;
}

.song-param-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.55rem;
}

.song-param-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  border: none;
  border-radius: 10px;
  padding: 0.35rem 0.6rem;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
}

.song-param-badge--key {
  background: #ccfbf1;
  color: #0f766e;
}

.song-param-badge--bpm {
  background: #eef2ff;
  color: var(--sp-accent);
}

.song-param-badge--capo {
  background: #ffedd5;
  color: #c2410c;
}

.song-param-badge.is-active {
  outline: 2px solid currentColor;
  outline-offset: 1px;
}

.song-play-hint {
  margin: 0;
  font-size: 0.75rem;
  color: var(--sp-muted);
  line-height: 1.4;
}

.song-practice-tips {
  margin-bottom: 0.85rem;
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 1px 4px rgba(245, 158, 11, 0.12);
}

.song-practice-tips[hidden] {
  display: none !important;
}

.song-practice-tips-summary {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 700;
  color: #b45309;
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.song-practice-tips-summary::-webkit-details-marker {
  display: none;
}

.song-practice-tips-summary::before {
  content: "💡";
  font-size: 0.95rem;
}

.song-practice-tips-summary::after {
  content: "▼";
  margin-left: auto;
  font-size: 0.65rem;
  color: #d97706;
  transition: transform 0.2s;
}

.song-practice-tips:not([open]) .song-practice-tips-summary::after {
  transform: rotate(-90deg);
}

.song-practice-tips-list {
  margin: 0;
  padding: 0 0.85rem 0.75rem 1.15rem;
  font-size: 0.78rem;
  line-height: 1.45;
  color: #78350f;
}

.song-practice-tips-list li {
  margin-bottom: 0.4rem;
}

.song-practice-tips-list li:last-child {
  margin-bottom: 0;
}

.song-inline-panel {
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid var(--sp-border);
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(8px);
}

.song-inline-panel[hidden] {
  display: none !important;
}

.song-font-panel {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.song-inline-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--sp-muted);
  margin-right: 0.25rem;
}

.song-inline-val {
  min-width: 2rem;
  text-align: center;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.song-tools-panel {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.song-tools-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.45rem;
}

.song-tool-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  padding: 0.45rem 0.35rem;
  border: 1px solid var(--sp-border);
  border-radius: 12px;
  background: #fff;
  font-size: 0.72rem;
  font-weight: 600;
  color: #374151;
  cursor: pointer;
  font-family: inherit;
}

.song-tool-tile-icon {
  font-size: 1.15rem;
  line-height: 1;
}

.song-tool-tile.is-active {
  border-color: var(--sp-accent);
  background: #eef2ff;
  color: var(--sp-accent);
}

.song-tools-switch {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: #374151;
  cursor: pointer;
  padding: 0.15rem 0;
}

.song-tools-switch input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.song-tools-switch-ui {
  width: 2.5rem;
  height: 1.35rem;
  border-radius: 999px;
  background: #d1d5db;
  position: relative;
  flex-shrink: 0;
  transition: background 0.15s;
}

.song-tools-switch-ui::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 1.05rem;
  height: 1.05rem;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
  transition: transform 0.15s;
}

.song-tools-switch input:checked + .song-tools-switch-ui {
  background: var(--sp-accent);
}

.song-tools-switch input:checked + .song-tools-switch-ui::after {
  transform: translateX(1.15rem);
}

.song-tag--on {
  background: #eef2ff;
  color: var(--sp-accent);
}

.song-chord.is-simplified {
  letter-spacing: 0.02em;
}

.song-icon-btn {
  border: 1px solid var(--sp-border);
  background: var(--sp-surface);
  border-radius: 8px;
  padding: 0.35rem 0.55rem;
  font-size: 0.75rem;
  cursor: pointer;
}

.song-icon-btn.is-active {
  background: #eef2ff;
  border-color: var(--sp-accent);
  color: var(--sp-accent);
}

.song-icon-btn--bpm {
  min-width: 2.6rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.song-bpm-fine {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 0.35rem;
}

.song-bpm-step--fine {
  flex: 1;
  max-width: 5rem;
  border: 1px solid var(--sp-border);
  background: var(--sp-surface);
  border-radius: 8px;
  padding: 0.35rem 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}

.song-bpm-hint {
  margin: 0.65rem 0 0;
  font-size: 0.72rem;
  color: var(--sp-muted);
  text-align: center;
  line-height: 1.35;
}

.song-main {
  position: relative;
  padding: 0.65rem 0.75rem 5rem;
}

body.song-has-chord-dock {
  --song-dock-h: 10.5rem;
}

body.song-has-chord-dock.song-chord-dock-collapsed {
  --song-dock-h: 2.85rem;
}

body.song-has-chord-dock .song-main {
  padding-bottom: calc(var(--song-dock-h) + 4.75rem);
}

body.song-has-chord-dock .song-fab-group {
  bottom: calc(var(--song-dock-h) + 0.65rem + env(safe-area-inset-bottom, 0px));
}

.song-chord-dock {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 43;
  background: rgba(255, 255, 255, 0.98);
  border-top: 1px solid var(--sp-border);
  box-shadow: 0 -6px 24px rgba(17, 24, 39, 0.1);
  backdrop-filter: blur(10px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

.song-chord-dock[hidden] {
  display: none !important;
}

.song-chord-dock-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 0.75rem;
  border: none;
  background: transparent;
  font: inherit;
  cursor: pointer;
  text-align: left;
}

.song-chord-dock-title {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--sp-muted);
  flex-shrink: 0;
}

.song-chord-dock-chips {
  flex: 1;
  display: flex;
  gap: 0.3rem;
  flex-wrap: wrap;
  min-width: 0;
}

.song-chord-dock-chip {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.15rem 0.45rem;
  border-radius: 6px;
  background: #fef3c7;
  color: var(--sp-chord);
}

.song-chord-dock-chevron {
  flex-shrink: 0;
  font-size: 0.7rem;
  color: var(--sp-muted);
}

.song-chord-dock-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding: 0 0.5rem 0.55rem;
}

.song-chord-dock-scroll::-webkit-scrollbar {
  display: none;
}

.song-chord-dock-scroll[hidden] {
  display: none;
}

.song-chord-dock-grid {
  display: flex;
  gap: 0.55rem;
  padding: 0 0.25rem;
  width: max-content;
  min-width: 100%;
  justify-content: center;
}

.song-chord-dock-card {
  flex: 0 0 auto;
  width: 5.5rem;
  margin: 0;
  text-align: center;
}

.song-chord-dock-card img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--sp-border);
  background: #fff;
  display: block;
}

.song-chord-dock-card figcaption {
  margin-top: 0.25rem;
  display: flex;
  flex-direction: column;
  gap: 0;
  line-height: 1.2;
}

.song-chord-dock-name {
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--sp-chord);
}

.song-chord-dock-real {
  font-size: 0.58rem;
  color: var(--sp-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 5.5rem;
}

@media (min-width: 520px) {
  body.song-has-chord-dock {
    --song-dock-h: 11.25rem;
  }

  .song-chord-dock-card {
    width: 6.25rem;
  }

  .song-chord-dock-real {
    max-width: 6.25rem;
  }
}

.song-content {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: var(--sp-font, 16px);
  line-height: 1.5;
}

.song-section-title {
  font-weight: 700;
  color: var(--sp-muted);
  margin: 1rem 0 0.5rem;
  font-size: calc(var(--sp-font, 16px) * 0.95);
}

.song-section-title:first-child {
  margin-top: 0.25rem;
}

.song-lyrics {
  margin: 0.2rem 0 0.55rem;
  padding: 0 0.15rem;
  font-family: "PingFang TC", "Heiti TC", system-ui, sans-serif;
  font-size: calc(var(--sp-font, 16px) * 0.92);
  line-height: 1.65;
  color: #374151;
  letter-spacing: 0.02em;
}

.song-bar-row {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 0.15rem 0.1rem;
  margin-bottom: 0.65rem;
}

.song-bar-sep {
  flex: 0 0 auto;
  align-self: center;
  color: var(--sp-chord);
  opacity: 0.4;
  font-weight: 300;
  font-size: 0.85em;
  padding: 0 0.05rem;
  user-select: none;
  pointer-events: none;
  line-height: 1;
}

.song-bar {
  flex: 1 1 0;
  min-width: 0;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0.35rem 0.2rem 0.45rem;
  cursor: pointer;
  position: relative;
  box-sizing: border-box;
}

.song-bar-num {
  position: absolute;
  top: 2px;
  left: 4px;
  font-size: 0.55rem;
  color: var(--sp-chord);
  opacity: 0.55;
}

.song-bar-chords {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: flex-end;
  gap: 0.2rem 0.35rem;
  padding-top: 0.55rem;
}

.song-chord-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  min-width: 1.6em;
}

.song-chord-beats {
  display: flex;
  justify-content: center;
  gap: 0.18rem;
  min-height: 0.45rem;
}

.song-chord-beat-dot {
  width: 0.38rem;
  height: 0.38rem;
  border-radius: 50%;
  background: #d1d5db;
  transition: background 0.08s, transform 0.08s;
}

.song-chord-beat-dot.is-on {
  background: #a5b4fc;
}

.song-chord-beat-dot.is-active {
  background: var(--sp-accent);
  transform: scale(1.2);
}

.song-chord-beat-dot.is-downbeat.is-active {
  background: #f59e0b;
}

.song-bar:not(.is-current) .song-chord-beat-dot {
  opacity: 0.45;
}

.song-bar.is-current .song-chord-beat-dot.is-on {
  opacity: 1;
}

.song-chord {
  font-weight: 700;
  color: var(--sp-chord);
  padding: 0.1rem 0.2rem;
  border-radius: 4px;
  border: 1.5px solid transparent;
}

.song-chord.is-active-chord {
  border-color: var(--sp-accent);
  background: #eef2ff;
  color: var(--sp-accent);
}

.song-bar.is-highlight {
  background: #fef3c7;
  border-color: #fbbf24;
}

.song-bar.is-current {
  background: #eef2ff;
  border-color: var(--sp-accent);
  box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.15);
}

.song-section-nav {
  position: fixed;
  left: 14px;
  bottom: max(1.25rem, env(safe-area-inset-bottom, 0px));
  z-index: 35;
  display: flex;
  flex-direction: column-reverse;
  align-items: flex-start;
  gap: 0.35rem;
}

.section-nav-toggle {
  border: 1px solid var(--sp-border);
  background: rgba(255, 255, 255, 0.95);
  border-radius: 12px;
  padding: 0.35rem 0.5rem;
  font-size: 0.72rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.section-nav-list {
  background: rgba(255, 255, 255, 0.97);
  border: 1px solid var(--sp-border);
  border-radius: 12px;
  padding: 0.35rem;
  max-height: min(45vh, calc(100vh - 10rem));
  overflow-y: auto;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.section-nav-list[hidden] {
  display: none;
}

.section-nav-item {
  display: block;
  width: 100%;
  text-align: left;
  border: none;
  background: transparent;
  padding: 0.35rem 0.5rem;
  border-radius: 8px;
  font-size: 0.72rem;
  cursor: pointer;
}

.section-nav-item.is-active,
.section-nav-item:hover {
  background: #eef2ff;
  color: var(--sp-accent);
}

.song-play-bar {
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  z-index: 45;
  background: #eef2ff;
  border-bottom: 1px solid #c7d2fe;
  padding: 0.5rem 0.75rem;
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.12);
}

.song-play-bar[hidden] {
  display: none;
}

.song-play-bar-inner {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  max-width: 640px;
  margin: 0 auto;
}

.song-beat-dots {
  display: flex;
  gap: 0.3rem;
}

.song-beat-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #c7d2fe;
}

.song-beat-dot.is-on {
  background: var(--sp-accent);
}

.song-beat-dot.is-on.is-downbeat {
  background: #dc2626;
}

.song-beat-dot.is-countdown.is-on {
  background: #f59e0b;
}

.song-beat-dot.is-countdown.is-on.is-downbeat {
  background: #ea580c;
}

.song-play-info {
  flex: 1;
  font-size: 0.8rem;
  font-weight: 600;
}

.song-play-stop {
  border: none;
  background: var(--sp-accent);
  color: #fff;
  border-radius: 8px;
  padding: 0.4rem 0.65rem;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
}

.song-fab-group {
  position: fixed;
  right: 14px;
  bottom: max(1.25rem, env(safe-area-inset-bottom, 0px));
  z-index: 44;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.45rem;
}

.song-fab {
  border: none;
  border-radius: 999px;
  padding: 0.6rem 0.95rem;
  font-weight: 700;
  font-size: 0.82rem;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
}

.song-fab:disabled {
  opacity: 0.55;
  cursor: wait;
}

.song-fab--play {
  background: var(--sp-accent);
  color: #fff;
  box-shadow: 0 4px 16px rgba(79, 70, 229, 0.35);
}

.song-fab--play.is-active {
  background: #4338ca;
}

.song-fab--click {
  background: #fff;
  color: #b45309;
  border: 2px solid #f59e0b;
}

.song-fab--click.is-active {
  background: #fef3c7;
  border-color: #ea580c;
  color: #9a3412;
}

.song-loading,
.song-error {
  text-align: center;
  padding: 3rem 1.5rem;
  color: var(--sp-muted);
}