/* ─── CHORD DETECTOR ─── */

/* ─── APP CONTAINER ─── */

.cd-app {
  width: 100%;
  max-width: 680px;
  padding: calc(var(--unit) * 4) calc(var(--unit) * 3);
  --unit: 8px;
  --surface: #1A1715;
  --surface2: #221E1B;
  --bg: #0F0D0B;
  --border: rgba(153, 153, 153, 0.2);
  --accent: #999;
  --accent-dim: #555;
  --text: #fff;
  --text-dim: #666;
  --text-mid: #999;
}

/* ─── HEADER ─── */

.section-meta {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: calc(var(--unit) * 3);
}

.section-index {
  font-family: 'Satoshi', sans-serif;
  font-weight: 700;
  font-size: calc(var(--unit) * 1.25);
  letter-spacing: 0.2em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.section-duration {
  font-size: calc(var(--unit) * 1.25);
  letter-spacing: 0.2em;
  color: var(--text-mid);
  text-transform: uppercase;
}

/* ─── CHORD DISPLAY ─── */

.chord-block {
  text-align: center;
  margin-bottom: calc(var(--unit) * 4);
}

.chord-name {
  font-family: 'Satoshi', sans-serif;
  font-weight: 700;
  font-size: calc(var(--unit) * 8);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-dim);
  line-height: 1;
  margin-bottom: calc(var(--unit) * 0.5);
  transition: color 0.15s;
}

.chord-name.has-chord {
  color: var(--text);
}

.chord-subtitle {
  font-size: calc(var(--unit) * 1.75);
  color: var(--text-mid);
  letter-spacing: 0.03em;
}

/* ─── NOTE GRID ─── */

.note-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: calc(var(--unit) * 0.5);
  margin-bottom: calc(var(--unit) * 4);
}

.note-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: calc(var(--unit) * 1);
}

/* Beat-dot style note indicators */
.note-dot {
  width: calc(var(--unit) * 4.5);
  height: calc(var(--unit) * 4.5);
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: calc(var(--unit) * 1.25);
  color: var(--text-dim);
  transition: all 0.1s;
  user-select: none;
}

.note-dot.active {
  background: var(--text);
  border-color: var(--text);
  color: var(--bg);
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.3);
  transform: scale(1.1);
}

/* Vertical energy bars */
.energy-bar-wrap {
  width: 4px;
  height: calc(var(--unit) * 8);
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
}

.energy-bar {
  width: 100%;
  height: 0%;
  background: var(--text);
  border-radius: 2px;
  transition: height 0.05s linear;
}

/* Input level meter */
.input-level-wrap {
  width: 100%;
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: calc(var(--unit) * 3);
}

.input-level {
  width: 0%;
  height: 100%;
  background: var(--text);
  border-radius: 2px;
  transition: width 0.1s linear;
}

/* ─── CONTROLS ─── */

.controls {
  display: flex;
  gap: calc(var(--unit) * 1.25);
  align-items: center;
  justify-content: flex-end;
  margin-bottom: calc(var(--unit) * 4);
}

.cd-app .btn-primary {
  font-family: 'Satoshi', sans-serif;
  font-weight: 700;
  font-size: calc(var(--unit) * 1.75);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--text);
  color: var(--bg);
  border: none;
  border-radius: calc(var(--unit) * 0.5);
  padding: calc(var(--unit) * 1.5) calc(var(--unit) * 4);
  cursor: pointer;
  transition: all 0.15s;
  min-height: 44px;
  min-width: 44px;
}

.cd-app .btn-primary:hover {
  background: var(--text-mid);
}

.cd-app .btn-primary.is-running {
  background: transparent;
  color: var(--text-mid);
  border: 1px solid var(--border);
}

.cd-app .btn-primary.is-running:hover {
  border-color: var(--text-mid);
  color: var(--text);
}

/* Device selector */
.device-select {
  -webkit-appearance: none;
  appearance: none;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: calc(var(--unit) * 1.5);
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: calc(var(--unit) * 0.5);
  padding: calc(var(--unit) * 1.25) calc(var(--unit) * 4) calc(var(--unit) * 1.25) calc(var(--unit) * 1.5);
  width: 100%;
  min-height: 44px;
  cursor: pointer;
  outline: none;
  transition: border-color 0.15s;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23999'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right calc(var(--unit) * 1.5) center;
}

.device-select:hover,
.device-select:focus {
  border-color: var(--text-mid);
}

.device-select option {
  background: var(--surface2);
  color: var(--text);
  padding: calc(var(--unit) * 1);
}

/* ─── SLIDER PANEL ─── */

.slider-panel {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: calc(var(--unit) * 0.5);
  padding: calc(var(--unit) * 2.5);
  display: flex;
  flex-direction: column;
  gap: calc(var(--unit) * 2);
}

.slider-group {
  display: flex;
  flex-direction: column;
  gap: calc(var(--unit) * 0.75);
}

.slider-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.slider-label {
  font-size: calc(var(--unit) * 1.25);
  letter-spacing: 0.25em;
  color: var(--text-mid);
  text-transform: uppercase;
}

.slider-value {
  font-size: calc(var(--unit) * 1.75);
  color: var(--text);
  min-width: 40px;
  text-align: right;
}

/* Range input -- matches bass-practice slider style */
.cd-app input[type=range] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 44px; /* touch-friendly hit area */
  background: transparent;
  outline: none;
  cursor: pointer;
}

.cd-app input[type=range]::-webkit-slider-runnable-track {
  height: 2px;
  background: var(--border);
  border-radius: 1px;
}

.cd-app input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text);
  cursor: pointer;
  margin-top: -6px;
}

.cd-app input[type=range]::-moz-range-track {
  height: 2px;
  background: var(--border);
  border-radius: 1px;
  border: none;
}

.cd-app input[type=range]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text);
  border: none;
  cursor: pointer;
}

/* ─── RESPONSIVE ─── */

@media screen and (max-width: 600px) {
  .cd-app {
    padding: calc(var(--unit) * 3) calc(var(--unit) * 2);
  }

  .chord-name {
    font-size: calc(var(--unit) * 6);
  }

  .note-dot {
    width: 100%;
    max-width: calc(var(--unit) * 3.5);
    aspect-ratio: 1;
    height: auto;
    font-size: calc(var(--unit) * 1.1);
  }

  .note-grid {
    gap: 2px;
  }
}

@media screen and (min-width: 601px) {
  .note-dot {
    width: calc(var(--unit) * 5);
    height: calc(var(--unit) * 5);
    font-size: calc(var(--unit) * 1.5);
  }

  .note-grid {
    gap: calc(var(--unit) * 1);
  }
}