/* CarDSPMusicPlayer — 音づくりのしくみ (page-specific) ------------------ */

:root {
  --series-1: #8f73ff;   /* violet: primary curve (validated on #10131c) */
  --series-2: #27a89e;   /* teal: secondary curve */
  --chart-surface: #10131c;
  --chart-grid: rgba(255, 255, 255, 0.07);
  --chart-axis: rgba(255, 255, 255, 0.22);
  --chart-ref: rgba(255, 255, 255, 0.35);
  --chart-ghost: rgba(237, 240, 247, 0.28);
}

.dsp-hero {
  max-width: 760px;
  padding: 40px 0 8px;
}

.dsp-hero .kicker {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 12px;
}

.dsp-hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
}

.platform-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 8px 0 16px;
}

.scope-note {
  font-size: 0.85rem;
  color: var(--text-faint);
}

.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 8px;
}

.toc a {
  font-size: 0.82rem;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-dim);
  background: var(--surface);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.toc a:hover {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.2);
}

.dsp-section {
  padding: 64px 0 8px;
  max-width: 900px;
  scroll-margin-top: 80px;
}

.dsp-section h2 {
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.dsp-section h2 .num {
  flex: none;
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 12px;
  background: var(--accent-gradient);
  color: #fff;
  font-size: 1rem;
}

.dsp-section strong {
  color: var(--text);
}

.note {
  font-size: 0.88rem;
  color: var(--text-faint);
}

/* Flow ------------------------------------------------------------------ */

.flow {
  list-style: none;
  margin: 24px 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.flow li {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  align-items: baseline;
}

.flow li + li::before {
  content: "";
  position: absolute;
  top: -11px;
  left: 28px;
  width: 2px;
  height: 11px;
  background: var(--accent-gradient);
}

.flow li strong {
  font-family: "Space Grotesk", "Inter", "Hiragino Sans", sans-serif;
}

.flow li span {
  color: var(--text-dim);
  font-size: 0.9rem;
}

.flow .flow-io {
  background: transparent;
  border-style: dashed;
  color: var(--text-faint);
  font-size: 0.9rem;
}

.flow .flow-always {
  border-color: rgba(52, 214, 201, 0.4);
}

/* Frequency strip ------------------------------------------------------- */

.freq-strip {
  display: grid;
  /* log scale 20Hz..20kHz: 150Hz ≈ 29%, 4kHz ≈ 76.7% */
  grid-template-columns: 29.2fr 47.5fr 23.3fr;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 24px 0 6px;
  border: 1px solid var(--border);
}

.freq-zone {
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.freq-zone b {
  font-family: "Space Grotesk", "Inter", "Hiragino Sans", sans-serif;
}

.freq-zone span {
  font-size: 0.78rem;
  color: var(--text-dim);
}

.freq-zone.low { background: rgba(124, 92, 255, 0.22); }
.freq-zone.mid { background: rgba(255, 255, 255, 0.05); }
.freq-zone.high { background: rgba(52, 214, 201, 0.18); }

.freq-scale {
  position: relative;
  height: 20px;
  font-size: 0.75rem;
  color: var(--text-faint);
  margin: 0 18px 18px 18px;
}

.freq-scale span {
  position: absolute;
  transform: translateX(-50%);
  white-space: nowrap;
}

/* Series vs crossover schematic ---------------------------------------- */

.compare {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin: 24px 0 16px;
}

.compare-item {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
}

.compare-item figcaption {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.compare-item svg {
  width: 100%;
  height: auto;
}

.sch rect,
.sch circle {
  fill: rgba(255, 255, 255, 0.04);
  stroke: var(--text-faint);
  stroke-width: 1.5;
}

.sch path {
  fill: none;
  stroke: var(--text-faint);
  stroke-width: 1.5;
}

.sch text {
  fill: var(--text-dim);
  font-size: 12px;
  text-anchor: middle;
  font-family: "Inter", "Hiragino Sans", sans-serif;
}

.sch text.small {
  font-size: 10px;
  fill: var(--text-faint);
}

.sch text.dots {
  font-size: 18px;
}

.sch.on rect { stroke: var(--series-1); }
.sch.on path { stroke: var(--series-1); }

.compare-item.muted {
  opacity: 0.75;
}

.points {
  color: var(--text-dim);
  padding-left: 1.2em;
}

/* Chart card ------------------------------------------------------------ */

.chart-card {
  background: var(--chart-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px 22px 16px;
  margin: 24px 0 16px;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 28px;
  align-items: flex-end;
  margin-bottom: 14px;
}

.controls label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-dim);
  min-width: 200px;
  flex: 1 1 200px;
}

.controls output {
  font-variant-numeric: tabular-nums;
  color: var(--text);
  font-weight: 600;
  margin-left: 6px;
}

.controls select {
  background: var(--bg-soft);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font: inherit;
}

.controls input[type="range"] {
  width: 100%;
  accent-color: var(--series-1);
}

.seg {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.seg button {
  font-size: 0.82rem;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
}

.seg button.is-on {
  background: var(--surface-strong);
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.25);
}

.chart {
  position: relative;
  width: 100%;
}

.chart svg {
  width: 100%;
  height: auto;
  display: block;
  touch-action: pan-y;
}

.chart .grid line { stroke: var(--chart-grid); stroke-width: 1; }
.chart .axis line { stroke: var(--chart-axis); stroke-width: 1; }
.chart .zero { stroke: var(--chart-ref); stroke-width: 1; }
.chart .ref { stroke: var(--chart-ref); stroke-width: 1; stroke-dasharray: 4 4; }
.chart .ref-label { fill: var(--text-faint); font-size: 11px; }
.chart .tick { fill: var(--text-faint); font-size: 11px; font-variant-numeric: tabular-nums; }
.chart .axis-title { fill: var(--text-faint); font-size: 11px; }
.chart .series { fill: none; stroke-linejoin: round; stroke-linecap: round; }
.chart .direct-label { font-size: 12px; fill: var(--text-dim); }
.chart .hover-line { stroke: rgba(255, 255, 255, 0.35); stroke-width: 1; }
.chart .hover-dot { stroke: var(--chart-surface); stroke-width: 2; }
.chart .band-marker { fill: var(--text-faint); }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-top: 8px;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.legend i {
  display: inline-block;
  width: 18px;
  height: 0;
  border-top: 2px solid currentColor;
}

.legend i.dashed { border-top-style: dashed; }
.legend i.thin { border-top-width: 1px; }

.chart-caption {
  font-size: 0.82rem;
  color: var(--text-faint);
  margin: 12px 0 6px;
}

.data-table summary {
  cursor: pointer;
  font-size: 0.82rem;
  color: var(--accent-2);
  margin: 4px 0;
}

.data-table table {
  font-size: 0.8rem;
}

.trim-readout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px;
  margin-bottom: 10px;
}

.trim-readout div {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
}

.trim-readout small {
  display: block;
  font-size: 0.75rem;
  color: var(--text-faint);
}

.trim-readout b {
  font-size: 1.25rem;
  font-variant-numeric: tabular-nums;
  font-family: "Space Grotesk", "Inter", sans-serif;
}

/* Tables ---------------------------------------------------------------- */

.table-wrap {
  overflow-x: auto;
  margin: 16px 0;
}

.dsp-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.dsp-table th,
.dsp-table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.dsp-table th {
  color: var(--text-faint);
  font-weight: 600;
  font-size: 0.78rem;
}

.dsp-table td {
  color: var(--text-dim);
}

.dsp-table td:first-child {
  color: var(--text);
  white-space: nowrap;
}

.band-table {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px;
}

.band-table div {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.band-table b { font-size: 0.9rem; }
.band-table span { font-size: 0.8rem; color: var(--text-dim); }

/* Tooltip --------------------------------------------------------------- */

.chart-tip {
  position: fixed;
  pointer-events: none;
  z-index: 60;
  background: rgba(16, 19, 28, 0.96);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 0.78rem;
  color: var(--text);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transition: opacity 0.12s ease;
  white-space: nowrap;
}

.chart-tip.is-on { opacity: 1; }
.chart-tip .t-head { color: var(--text-faint); margin-bottom: 4px; }
.chart-tip .t-row { display: flex; align-items: center; gap: 8px; }
.chart-tip .t-row i { width: 10px; height: 2px; display: inline-block; }
.chart-tip .t-row b { margin-left: auto; padding-left: 12px; font-variant-numeric: tabular-nums; }

@media (max-width: 640px) {
  .dsp-section { padding-top: 48px; }
  .chart-card { padding: 16px 12px 12px; }
  .freq-zone span { display: none; }
}