/* Metronome Styles */
.metronome-page {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: start;
  padding: 24px 0 80px;
}

.metro-display {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg, 16px);
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 26px;
  box-shadow: var(--shadow-md);
}

.metro-bpm-ring {
  width: 190px;
  height: 190px;
  border-radius: 50%;
  border: 4px solid var(--accent);
  display: grid;
  place-items: center;
  position: relative;
  background: var(--card-bg-subtle);
  box-shadow: 0 0 0 10px var(--accent-bg-subtle);
}

.metro-pendulum {
  position: absolute;
  bottom: 50%;
  left: 50%;
  width: 4px;
  height: 78px;
  background: var(--ink);
  transform-origin: bottom center;
  transform: translateX(-50%) rotate(0deg);
  border-radius: 3px 3px 0 0;
  pointer-events: none;
}

.metro-bob {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.metro-pendulum.swing-left {
  transform: translateX(-50%) rotate(-35deg);
}

.metro-pendulum.swing-right {
  transform: translateX(-50%) rotate(35deg);
}

.metro-bpm-number {
  font: 700 48px / 1 var(--serif);
  color: var(--ink-heading);
  z-index: 1;
}

.metro-controls {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.metro-label {
  font-size: 10px;
  letter-spacing: 1.2px;
  color: var(--muted);
  font-weight: 700;
  display: block;
  text-transform: uppercase;
}

.metro-slider-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.metro-slider-row input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
  height: 6px;
  cursor: pointer;
}

.metro-bpm-label {
  font-size: 11px;
  color: var(--muted);
  min-width: 28px;
  text-align: center;
  font-weight: 600;
}

.metro-bpm-presets {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.metro-preset {
  flex: 1;
  min-width: 58px;
  border: 1px solid var(--line);
  background: var(--card-bg-subtle);
  color: var(--ink);
  border-radius: var(--radius-sm, 6px);
  padding: 8px 6px;
  font: 600 11px var(--sans);
  cursor: pointer;
  text-align: center;
  line-height: 1.3;
  transition: all 0.15s ease;
}

.metro-preset:hover,
.metro-preset.active {
  background: var(--accent);
  border-color: var(--accent-hover);
  color: var(--accent-text);
  transform: translateY(-1px);
}

.metro-preset small {
  font-size: 9px;
  opacity: 0.85;
  display: block;
}

.metro-buttons {
  display: flex;
  gap: 12px;
}

.metro-buttons .button {
  flex: 1;
  padding: 12px;
  font-size: 13px;
}

.metro-beat-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin: 6px 0;
}

.metro-beat {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--line);
  transition: all 0.1s ease;
}

.metro-beat.metro-beat-on {
  background: var(--accent);
  box-shadow: 0 0 8px rgba(245, 158, 11, 0.4);
}

.metro-beat.metro-beat-pulse {
  background: var(--accent-bright);
  transform: scale(1.35);
  box-shadow: 0 0 14px var(--accent);
}

.metro-time-sig {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.metro-sig-buttons {
  display: flex;
  gap: 8px;
}

.metro-sig {
  flex: 1;
  border: 1px solid var(--line);
  background: var(--card-bg-subtle);
  color: var(--ink);
  border-radius: var(--radius-sm, 6px);
  padding: 10px;
  font: 600 12px var(--sans);
  cursor: pointer;
  transition: all 0.15s ease;
}

.metro-sig.active {
  background: var(--accent);
  border-color: var(--accent-hover);
  color: var(--accent-text);
}

.metro-info {
  padding: 8px 0;
}

.metro-info h2 {
  font: 700 36px / 1.15 var(--serif);
  letter-spacing: -1.2px;
  margin: 12px 0 14px;
  color: var(--ink-heading);
}

.metro-info h2 em {
  color: var(--accent-hover);
  font-style: normal;
}

.metro-info p {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

.metro-tip {
  background: var(--accent-bg-subtle);
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius-sm, 6px) var(--radius-sm, 6px) 0;
  padding: 18px 20px;
  margin-top: 24px;
}

.metro-tip b {
  color: var(--ink-heading);
  font-size: 14px;
}

.metro-tip p {
  font-size: 13px;
  margin: 6px 0 0;
  color: var(--ink);
}

@media (max-width: 768px) {
  .metronome-page {
    grid-template-columns: 1fr;
    padding: 16px 0 60px;
    gap: 32px;
  }
  .metro-display {
    padding: 24px 16px;
  }
  .metro-info h2 {
    font-size: 28px;
  }
}

/* ==========================================================================
   Rhythm Keeper: The Silent Gap Challenge
   ========================================================================== */
.metro-game-section {
  margin: 0 0 72px;
}

.rhythm-game-card {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg, 16px);
  padding: 36px 32px;
  box-shadow: var(--shadow-md);
}

.rhythm-hud {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.rhythm-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  margin: 24px 0;
  position: relative;
}

.rhythm-radar-wrap {
  position: relative;
  width: 140px;
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.rhythm-radar-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 3px solid var(--accent);
  opacity: 0.2;
  transition: all 0.2s ease;
}

.rhythm-radar-ring.pulse {
  animation: rkRadarPulse 0.5s cubic-bezier(0, 0, 0.2, 1);
}

@keyframes rkRadarPulse {
  0% { transform: scale(0.8); opacity: 0.9; }
  100% { transform: scale(1.4); opacity: 0; }
}

.rhythm-pulse-indicator {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--accent-hover);
  text-align: center;
  text-transform: uppercase;
  max-width: 110px;
  line-height: 1.4;
}

.rhythm-drum-pad {
  width: 240px;
  height: 110px;
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  border: 3px solid #f59e0b;
  border-radius: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(245, 158, 11, 0.35);
  transition: transform 0.08s ease, box-shadow 0.08s ease;
  user-select: none;
}

html.dark .rhythm-drum-pad {
  background: linear-gradient(135deg, #78350f 0%, #b45309 100%);
  border-color: #f59e0b;
}

.rhythm-drum-pad:not(:disabled):active,
.rhythm-drum-pad.tapped {
  transform: scale(0.96) translateY(3px);
  box-shadow: 0 2px 10px rgba(245, 158, 11, 0.4);
}

.rhythm-drum-pad:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  filter: grayscale(0.5);
  box-shadow: none;
}

.pad-icon {
  font-size: 32px;
}

.pad-label {
  font-size: 15px;
  font-weight: 800;
  color: #78350f;
  margin-top: 4px;
}

html.dark .pad-label {
  color: #fef3c7;
}

.pad-key-hint {
  font-size: 11px;
  color: #92400e;
  opacity: 0.8;
}

html.dark .pad-key-hint {
  color: #fde68a;
}

.rhythm-accuracy-meter {
  background: var(--card-bg-subtle);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  margin: 18px 0;
}

.acc-scale {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  margin-bottom: 8px;
}

.acc-track {
  height: 12px;
  background: #e5e7eb;
  border-radius: 999px;
  position: relative;
  overflow: visible;
}

html.dark .acc-track {
  background: #374151;
}

.acc-center-zone {
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(50% - 25px);
  width: 50px;
  background: #10b981;
  border-radius: 999px;
  opacity: 0.6;
}

.acc-marker {
  position: absolute;
  top: -4px;
  left: 50%;
  width: 20px;
  height: 20px;
  background: #ffffff;
  border: 3px solid #111827;
  border-radius: 50%;
  transform: translateX(-50%);
  transition: left 0.15s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
}

.acc-verdict {
  font-size: 14px;
  color: var(--ink);
  font-weight: 600;
  margin-top: 10px;
  text-align: center;
}

.rk-difficulty-selector {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.rk-diff-btn {
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--card-bg);
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.15s ease;
}

.rk-diff-btn.active, .rk-diff-btn:hover {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent-hover);
}