:root {
  --bg: #0a0612;
  --surface: #16102a;
  --border: #3a2d58;
  --text: #f2ebff;
  --muted: #9a8ab8;
  --accent: #c8a8ff;
  --accent-warm: #ff9de2;
  --font: "Segoe UI", system-ui, sans-serif;
  --stage-ratio: 520 / 440;
}

* {
  box-sizing: border-box;
}

body.piano-shell {
  font-family: var(--font);
  background: radial-gradient(ellipse 110% 65% at 50% -15%, #2a1848, var(--bg) 52%);
  color: var(--text);
}

.piano-shell .top-bar {
  display: flex;
  align-items: center;
  gap: 0.65rem 1rem;
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--border);
  background: rgba(22, 16, 42, 0.92);
  flex-shrink: 0;
}

.piano-shell .top-bar h1 {
  margin: 0;
  font-size: 1.05rem;
  color: var(--accent);
  flex: 1;
  min-width: 0;
}

.piano-shell .back {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}

.piano-shell .back:hover {
  color: var(--accent-warm);
  text-decoration: underline;
}

.piano-shell .back-home {
  color: #e8d4ff;
}

.piano-shell .header-theme {
  color: var(--accent-warm);
  font-size: 0.85rem;
  font-weight: 600;
  flex-shrink: 0;
}

.piano-shell .header-nav-right {
  margin-left: auto;
}

.piano-shell .pad-unlock-banner {
  background: linear-gradient(90deg, #2a1848, #3d2860, #2a1848);
  border-bottom-color: var(--accent);
  color: var(--accent);
}

.piano-shell .hud {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 0.5rem 1.5rem;
  padding: 0.45rem 1rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.piano-shell .hud-block {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.piano-shell .hud-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.piano-shell .hud-value {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent-warm);
  line-height: 1.1;
}

.piano-shell .stage-wrap {
  --stage-ratio: 520 / 440;
  flex: 1;
  min-height: 12rem;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
  background: radial-gradient(ellipse 80% 70% at 50% 45%, rgba(42, 26, 72, 0.45), transparent);
}

.piano-shell .stage-wrap .stage {
  border: 2px solid var(--border);
  border-radius: 12px;
  box-shadow:
    0 0 0 1px rgba(200, 168, 255, 0.08),
    0 12px 40px rgba(0, 0, 0, 0.55);
  background: #0a0612;
}

.piano-shell .hint {
  flex-shrink: 0;
  margin: 0;
  padding: 0.45rem 1rem 0.65rem;
  font-size: 0.82rem;
  color: var(--muted);
  text-align: center;
}

.piano-shell .overlay {
  background: rgba(10, 6, 18, 0.88);
}

.piano-shell .overlay-card {
  max-width: 26rem;
  background: linear-gradient(160deg, #1e1438, var(--surface));
  border-color: var(--border);
}

.piano-shell .overlay-card h2 {
  color: var(--accent);
}

.mode-tabs {
  display: flex;
  gap: 0.35rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.mode-tab {
  flex: 1 1 5rem;
  padding: 0.5rem 0.65rem;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: #120c22;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
}

.mode-tab.selected {
  border-color: var(--accent);
  color: var(--text);
  background: linear-gradient(135deg, #2a1a48, #16102a);
}

.mode-tab.disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.theme-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
}

.pick-card {
  padding: 0.7rem 0.75rem;
  border: 2px solid var(--border);
  border-radius: 10px;
  background: #120c22;
  color: var(--text);
  cursor: pointer;
  text-align: left;
  transition: border-color 0.12s, transform 0.1s;
}

.pick-card:hover {
  border-color: #6a5090;
  transform: translateY(-1px);
}

.pick-card.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(200, 168, 255, 0.3);
}

.pick-title {
  display: block;
  font-weight: 700;
  font-size: 0.95rem;
}

.pick-desc {
  display: block;
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 0.15rem;
}

.pick-section h3 {
  margin: 0 0 0.45rem;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.pick-options .mode-toggle {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
  padding: 0.65rem 0.75rem;
  border: 2px solid var(--border);
  border-radius: 10px;
  background: #120c22;
  cursor: pointer;
  margin-bottom: 0.5rem;
}

.pick-options .mode-toggle input {
  margin-top: 0.2rem;
  accent-color: var(--accent);
}

.bpm-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.5rem 0.75rem;
  border: 2px solid var(--border);
  border-radius: 10px;
  background: #120c22;
  font-size: 0.88rem;
}

.bpm-row select {
  background: #0a0612;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.35rem 0.5rem;
}

.primary {
  display: block;
  width: 100%;
  margin-top: 0.85rem;
  padding: 0.7rem 1rem;
  border: none;
  border-radius: 10px;
  background: linear-gradient(135deg, #9b6fd4, var(--accent));
  color: #1a1028;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
}

.primary:hover {
  filter: brightness(1.06);
}

.secondary {
  display: block;
  width: 100%;
  margin-top: 0.5rem;
  padding: 0.55rem 1rem;
  border: 2px solid var(--border);
  border-radius: 10px;
  background: #120c22;
  color: var(--text);
  font-weight: 600;
  cursor: pointer;
}

.secondary:hover:not(:disabled) {
  border-color: var(--accent);
}

.secondary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.secondary.small {
  width: auto;
  margin-top: 0;
  padding: 0.4rem 0.75rem;
  font-size: 0.82rem;
}

.play-toolbar {
  position: fixed;
  bottom: 0.75rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0.45rem;
  padding: 0.45rem 0.6rem;
  background: rgba(22, 16, 42, 0.94);
  border: 1px solid var(--border);
  border-radius: 12px;
  z-index: 12;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
}

.play-toolbar[hidden],
.pause-btn[hidden],
#btnBackMenu[hidden],
#playHud[hidden],
#playHint[hidden],
#playToolbar[hidden] {
  display: none !important;
}

#btnRecToggle.recording {
  border-color: #ff5c7a;
  color: #ff9db0;
}

.rec-hint {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0.5rem 0 0.35rem;
}

.rec-btns {
  display: flex;
  gap: 0.5rem;
}

.rec-btns .secondary {
  flex: 1;
  margin-top: 0;
}

.piano-loading {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10, 6, 18, 0.94);
}

.piano-loading[hidden] {
  display: none !important;
}

.piano-spinner {
  width: 44px;
  height: 44px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: piano-spin 0.7s linear infinite;
}

@keyframes piano-spin {
  to {
    transform: rotate(360deg);
  }
}

.piano-loading-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  color: var(--muted);
}

.diff-row,
.lesson-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
}

.lesson-row {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.hud-value-sm {
  font-size: 0.82rem;
  max-width: 8rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.menu-sound.hidden {
  display: none !important;
}

.results-panel {
  margin: 0.75rem 0 0.25rem;
  padding: 0.75rem 0.85rem;
  border: 2px solid var(--border);
  border-radius: 10px;
  background: #120c22;
  text-align: center;
}

.results-panel .results-title {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  color: var(--accent-warm);
}

.results-panel p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.menu-home-link {
  margin: 0 0 1rem;
  text-align: center;
}

.menu-home-link a {
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
}

.menu-home-link a:hover {
  color: var(--accent-warm);
  text-decoration: underline;
}

.piano-shell.body-playing .header-theme {
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  background: rgba(200, 168, 255, 0.12);
  border: 1px solid rgba(200, 168, 255, 0.25);
}