* {
  box-sizing: border-box;
}

:root {
  --page-bg: #000000;
  --panel-bg: #101010;
  --panel-border: #333333;
  --text-main: #ffffff;
  --text-muted: #aaaaaa;
  --accent: #ffffff;
  --accent-soft: rgba(255, 255, 255, 0.12);
  --low: #c9463c;
  --mid: #f2795c;
  --high: #ffb9a6;
  --amplitude: #ffffff;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--text-main);
  background: var(--page-bg);
}

button,
audio {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.app-shell {
  width: auto;
  margin: 0;
  padding: 40px 4% 40px max(32px, calc((100vw - 1120px) / 2));
}

.layout {
  display: flex;
  gap: 96px;
  align-items: center;
  min-height: calc(100vh - 80px);
}

.reading-col {
  flex: 0 0 360px;
}

.stage-col {
  flex: 1 1 auto;
  min-width: 0;
}

@media (max-width: 860px) {
  .app-shell {
    padding: 32px 16px;
  }

  .layout {
    flex-direction: column;
    align-items: stretch;
    gap: 40px;
    min-height: 0;
  }

  .reading-col {
    flex: 1 1 auto;
  }
}

.app-header {
  margin-bottom: 32px;
  text-align: left;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 32px;
  font-size: 2rem;
  font-weight: 700;
}

.origin-note {
  max-width: 620px;
  margin: 0 0 16px;
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.origin-attribution {
  margin: -8px 0 32px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.intro {
  max-width: 620px;
  margin: 0 0 40px;
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.track-panel {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  gap: 12px;
  margin-bottom: 20px;
}

.track-button,
#play-pause-button,
#restart-button {
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  padding: 10px 18px;
  font-size: 0.875rem;
  color: var(--text-main);
  background: #1a1a1a;
}

.track-button {
  border-radius: 0;
}

.track-button:hover:not(:disabled),
#play-pause-button:hover:not(:disabled),
#restart-button:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.track-button.is-active {
  border-color: var(--accent);
  color: #000000;
  background: var(--accent);
  box-shadow: 0 0 24px rgba(255, 255, 255, 0.35);
}

.visualizer-panel {
  padding: 0;
}

.visualizer-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 16px;
}


.mode-panel {
  display: inline-flex;
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  padding: 3px;
  background: #141414;
}

.mode-button {
  border: 0;
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 0.875rem;
  color: var(--text-muted);
  background: transparent;
}

.reading-col .mode-panel {
  display: flex;
  flex-direction: column;
  width: 100%;
  gap: 0;
  border: 0;
  border-radius: 0;
  padding: 0;
  background: transparent;
  margin-bottom: 20px;
}

.reading-col .mode-button {
  border-radius: 0;
  padding: 12px 10px;
  text-align: left;
}

.reading-col .mode-button + .mode-button {
  border-top: 1px solid #333333;
}

.mode-label {
  display: block;
}

.mode-note {
  display: block;
  margin-top: 2px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.mode-button.is-active .mode-note {
  color: rgba(0, 0, 0, 0.65);
}

.canvas-wrap {
  position: relative;
}

.canvas-legend {
  position: absolute;
  top: 14px;
  left: 16px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  font-size: 0.78rem;
}

.canvas-legend .legend-line::before {
  content: "";
  display: inline-block;
  width: 18px;
  height: 2px;
  margin-right: 8px;
  vertical-align: middle;
  background: currentColor;
}

.canvas-legend .amplitude {
  color: var(--amplitude);
}

.canvas-legend .low {
  color: var(--low);
}

.canvas-legend .mid {
  color: var(--mid);
}

.canvas-legend .high {
  color: var(--high);
}

.canvas-zoom {
  display: flex;
  gap: 4px;
  align-self: flex-end;
}

.zoom-button {
  border: 0;
  padding: 4px 8px;
  font-size: 0.78rem;
  color: var(--text-muted);
  background: transparent;
}

.zoom-button:hover {
  color: var(--text-main);
}

.zoom-button.is-active {
  color: #000000;
  background: var(--accent);
}

.mode-button:hover {
  color: var(--text-main);
}

.mode-button.is-active {
  color: #000000;
  background: var(--accent);
  box-shadow: 0 0 24px rgba(255, 255, 255, 0.35);
}

.label {
  margin: 0 0 4px;
  color: var(--text-muted);
  font-size: 0.78rem;
  text-transform: uppercase;
}

h2 {
  margin: 0;
  font-size: clamp(1.25rem, 3vw, 2rem);
  font-weight: 500;
}

#current-track {
  font-size: 0.78rem;
}

.transport button {
  font-size: 1rem;
  min-width: 56px;
}

.transport .button-text {
  margin-left: 6px;
  font-size: 0.78rem;
  color: inherit;
}

#visualizer-canvas {
  display: block;
  width: 100%;
  aspect-ratio: 1200 / 640;
  border: 1px solid #333333;
  border-radius: 6px;
  background: #000000;
  box-shadow: 0 0 120px rgba(244, 241, 234, 0.2);
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 14px;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.legend-item::before {
  content: "";
  display: inline-block;
  width: 22px;
  height: 2px;
  margin-right: 8px;
  vertical-align: middle;
  background: currentColor;
}

.legend-item.amplitude {
  color: var(--amplitude);
}

.legend-item.low {
  color: var(--low);
}

.legend-item.mid {
  color: var(--mid);
}

.legend-item.high {
  color: var(--high);
}

.visualizer-panel[data-mode="amplitude"] .legend-item.low,
.visualizer-panel[data-mode="amplitude"] .legend-item.mid,
.visualizer-panel[data-mode="amplitude"] .legend-item.high {
  display: none;
}

.visualizer-panel[data-mode="frequency"] .legend-item.amplitude,
.visualizer-panel[data-mode="relative"] .legend-item.amplitude {
  display: none;
}

.transport {
  display: flex;
  gap: 12px;
}


.controls-panel {
  margin-top: 18px;
}

.progress-panel {
  display: grid;
  gap: 7px;
  min-width: 240px;
}

.time-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--text-muted);
  font-size: 0.92rem;
  font-variant-numeric: tabular-nums;
}

.progress-bar {
  height: 10px;
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  overflow: hidden;
  background: #141414;
  cursor: default;
}

.progress-fill {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 120ms linear;
}

#audio-player {
  display: none;
}

@media (max-width: 720px) {
  html {
    font-size: 87.5%;
  }

  h1 {
    font-size: 1.7rem;
  }

  .visualizer-header {
    display: block;
  }

  .canvas-zoom {
    margin-top: 12px;
  }

  #visualizer-canvas {
    aspect-ratio: 4 / 3;
  }

  .canvas-wrap {
    display: flex;
    flex-direction: column;
  }

  .canvas-legend {
    position: static;
    order: -1;
    flex-direction: row;
    justify-content: flex-start;
    gap: 10px;
    margin-bottom: 8px;
    font-size: 0.68rem;
  }

  .canvas-legend .legend-line::before {
    width: 12px;
    margin-right: 5px;
  }

  .track-button.is-active,
  .mode-button.is-active {
    box-shadow: none;
  }

  #visualizer-canvas {
    box-shadow: 0 0 50px rgba(244, 241, 234, 0.12);
  }
}