/* ═══════════════════════════════════════════════════════════════════════════
   BeatGrid Studio — demo stylesheet
   Warm editorial palette: espresso brown, amber gold, terracotta.
   Dark surface to match the IDE theme; no cold blue anywhere.
   ═══════════════════════════════════════════════════════════════════════════ */

:root {
  --espresso-900: #17110d;
  --espresso-850: #1d1611;
  --espresso-800: #241b15;
  --espresso-700: #2e221a;
  --espresso-600: #3b2c22;
  --espresso-500: #4d3a2c;

  --cream: #f4ece2;
  --cream-dim: #cdbfae;
  --cream-muted: #9a8a79;

  --amber: #e8a33d;
  --amber-bright: #f6bd63;
  --amber-deep: #b8761f;
  --terracotta: #c96a4a;
  --terracotta-deep: #9c4a30;

  --ok: #7fa650;
  --line: rgba(244, 236, 226, 0.09);
  --line-strong: rgba(244, 236, 226, 0.16);

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;

  --font-sans: "Inter", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Code", ui-monospace, monospace;

  --shadow-panel: 0 1px 0 rgba(244, 236, 226, 0.04) inset, 0 18px 40px -28px rgba(0, 0, 0, 0.9);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(1200px 600px at 12% -10%, rgba(232, 163, 61, 0.09), transparent 60%),
    radial-gradient(900px 500px at 92% 0%, rgba(201, 106, 74, 0.07), transparent 55%),
    var(--espresso-900);
  color: var(--cream);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: 10px 16px;
  background: var(--amber);
  color: var(--espresso-900);
  font-weight: 600;
  z-index: 100;
}
.skip-link:focus {
  left: 12px;
  top: 12px;
  border-radius: var(--radius-sm);
}

/* ── Masthead ─────────────────────────────────────────────────────────── */

.masthead {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: flex-end;
  justify-content: space-between;
  max-width: 1480px;
  margin: 0 auto;
  padding: 40px 32px 24px;
  border-bottom: 1px solid var(--line);
}

.masthead__brand {
  display: flex;
  gap: 16px;
  align-items: center;
}

.mark {
  width: 44px;
  height: 44px;
  flex: 0 0 44px;
  border-radius: 12px;
  background:
    repeating-linear-gradient(
      90deg,
      var(--amber) 0 3px,
      transparent 3px 8px
    ),
    linear-gradient(150deg, var(--espresso-600), var(--espresso-800));
  border: 1px solid var(--line-strong);
  box-shadow: 0 0 0 1px rgba(232, 163, 61, 0.16), 0 8px 24px -12px rgba(232, 163, 61, 0.6);
}

.masthead h1 {
  margin: 0;
  font-size: 26px;
  font-weight: 650;
  letter-spacing: -0.02em;
}
.masthead h1 em {
  font-style: normal;
  color: var(--amber);
}

.tagline {
  margin: 4px 0 0;
  color: var(--cream-muted);
  font-size: 13.5px;
  letter-spacing: 0.01em;
}

.masthead__links {
  display: flex;
  gap: 20px;
  font-size: 13.5px;
}
.masthead__links a {
  color: var(--cream-dim);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}
.masthead__links a:hover,
.masthead__links a:focus-visible {
  color: var(--amber-bright);
  border-color: var(--amber-deep);
}

/* ── Workspace grid ───────────────────────────────────────────────────── */

.workspace {
  display: grid;
  grid-template-columns: 268px minmax(0, 1fr) 300px;
  gap: 20px;
  max-width: 1480px;
  margin: 0 auto;
  padding: 24px 32px 8px;
  align-items: start;
}

.panel {
  background: linear-gradient(180deg, var(--espresso-800), var(--espresso-850));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 18px;
  box-shadow: var(--shadow-panel);
}

.panel__title {
  margin: 0 0 4px;
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cream-muted);
}

.panel__hint {
  margin: 0 0 14px;
  font-size: 12.5px;
  color: var(--cream-muted);
  line-height: 1.5;
}

/* ── Track list ───────────────────────────────────────────────────────── */

.track-list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.track {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 12px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  background: rgba(244, 236, 226, 0.03);
  color: var(--cream-dim);
  font: inherit;
  font-size: 13.5px;
  text-align: left;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.12s;
}
.track:hover {
  background: rgba(244, 236, 226, 0.06);
  color: var(--cream);
}
.track:active {
  transform: translateY(1px);
}
.track[aria-current="true"] {
  background: linear-gradient(90deg, rgba(232, 163, 61, 0.16), rgba(232, 163, 61, 0.04));
  border-color: rgba(232, 163, 61, 0.38);
  color: var(--cream);
}
.track__bars {
  display: inline-flex;
  gap: 2px;
  align-items: flex-end;
  height: 14px;
  flex: 0 0 auto;
}
.track__bars i {
  display: block;
  width: 2px;
  border-radius: 1px;
  background: var(--amber-deep);
}
.track[aria-current="true"] .track__bars i {
  background: var(--amber-bright);
}
.track__name {
  flex: 1 1 auto;
  font-variant-numeric: tabular-nums;
}
.track__bpm {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cream-muted);
}
.track[aria-current="true"] .track__bpm {
  color: var(--amber-bright);
}

/* ── Transport ────────────────────────────────────────────────────────── */

.transport {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 14px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font: inherit;
  font-size: 13.5px;
  font-weight: 550;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.1s;
  white-space: nowrap;
}
.btn:active {
  transform: translateY(1px);
}
.btn:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.btn--primary {
  background: linear-gradient(180deg, var(--amber-bright), var(--amber));
  color: #2a1b08;
  flex: 1 1 auto;
  box-shadow: 0 8px 20px -12px rgba(232, 163, 61, 0.9);
}
.btn--primary:hover {
  background: linear-gradient(180deg, #ffcd7d, var(--amber-bright));
}
.btn--primary.is-playing {
  background: linear-gradient(180deg, var(--terracotta), var(--terracotta-deep));
  color: var(--cream);
}

.btn--outline {
  border-color: var(--line-strong);
  background: transparent;
  color: var(--cream-dim);
}
.btn--outline:hover {
  border-color: rgba(232, 163, 61, 0.5);
  color: var(--amber-bright);
  background: rgba(232, 163, 61, 0.07);
}

.btn--ghost {
  background: transparent;
  color: var(--cream-muted);
}
.btn--ghost:hover {
  color: var(--cream);
  background: rgba(244, 236, 226, 0.06);
}

.btn__icon {
  font-size: 11px;
}

.transport__meta {
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  flex: 0 0 auto;
}
.clock {
  color: var(--amber-bright);
  font-variant-numeric: tabular-nums;
}
.clock--muted {
  color: var(--cream-muted);
}

.volume {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 10px;
  font-size: 12.5px;
  color: var(--cream-muted);
  margin-bottom: 14px;
}

.kbd-hints p {
  margin: 0;
  font-size: 11.5px;
  line-height: 1.9;
  color: var(--cream-muted);
}

kbd {
  display: inline-block;
  min-width: 18px;
  padding: 1px 5px;
  border-radius: 4px;
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  background: rgba(244, 236, 226, 0.05);
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--cream-dim);
  text-align: center;
}

/* ── Stage ────────────────────────────────────────────────────────────── */

.panel--stage {
  min-width: 0;
}

.stage__head {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

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

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px;
  border-radius: 999px;
  background: rgba(232, 163, 61, 0.14);
  border: 1px solid rgba(232, 163, 61, 0.3);
  color: var(--amber-bright);
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  transition: background 0.2s, border-color 0.2s;
}
.badge--ghost {
  background: rgba(244, 236, 226, 0.04);
  border-color: var(--line);
  color: var(--cream-muted);
}

.stage__wave {
  position: relative;
  min-height: 220px;
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(0, 0, 0, 0.35), rgba(0, 0, 0, 0.5)),
    var(--espresso-900);
  border: 1px solid var(--line);
  overflow: hidden;
}

/* wavesurfer renders its own shadow DOM inside this element. */
.stage__wave wave {
  --wave-color: #6b5747;
  --progress-color: #e8a33d;
  --cursor-color: #f6bd63;
}

.stage__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 12px 0 16px;
  font-size: 11.5px;
  color: var(--cream-muted);
}
.stage__legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.swatch {
  display: inline-block;
  width: 14px;
  height: 3px;
  border-radius: 2px;
}
.swatch--bar {
  background: rgba(255, 255, 255, 0.55);
}
.swatch--beat {
  background: rgba(255, 255, 255, 0.22);
}
.swatch--sub {
  background: rgba(255, 255, 255, 0.08);
}
.swatch--onset {
  background: rgba(255, 190, 90, 0.9);
}
.swatch--loop {
  background: rgba(201, 106, 74, 0.5);
}

.stage__loop {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.loop-len {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--cream-muted);
}

.loop-status {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cream-muted);
}
.loop-status.is-active {
  color: var(--terracotta);
}

/* ── Controls ─────────────────────────────────────────────────────────── */

.field {
  margin-bottom: 16px;
}
.field label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  font-size: 12.5px;
  color: var(--cream-dim);
  margin-bottom: 7px;
}
.field output {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--amber-bright);
  font-variant-numeric: tabular-nums;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}
.field--compact {
  margin-bottom: 0;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--amber-deep), var(--espresso-600));
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--amber-bright);
  border: 2px solid var(--espresso-900);
  box-shadow: 0 0 0 1px var(--amber-deep);
  cursor: grab;
}
input[type="range"]::-moz-range-thumb {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--amber-bright);
  border: 2px solid var(--espresso-900);
  cursor: grab;
}
input[type="range"]:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 4px;
}

select {
  width: 100%;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong);
  background: var(--espresso-700);
  color: var(--cream);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
}
select:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 1px;
}

.toggles {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 14px 0;
  margin-bottom: 4px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.switch {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--cream-dim);
  cursor: pointer;
}
.switch input {
  position: relative;
  width: 34px;
  height: 19px;
  flex: 0 0 34px;
  margin: 0;
  border-radius: 999px;
  background: var(--espresso-600);
  border: 1px solid var(--line-strong);
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
  transition: background 0.18s, border-color 0.18s;
}
.switch input::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--cream-muted);
  transition: transform 0.18s, background 0.18s;
}
.switch input:checked {
  background: rgba(232, 163, 61, 0.28);
  border-color: rgba(232, 163, 61, 0.55);
}
.switch input:checked::after {
  transform: translateX(15px);
  background: var(--amber-bright);
}
.switch input:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.tap {
  padding: 14px 0;
}
.btn--tap {
  width: 100%;
  background: rgba(201, 106, 74, 0.14);
  border: 1px solid rgba(201, 106, 74, 0.36);
  color: #f0b8a4;
  justify-content: center;
  gap: 10px;
}
.btn--tap:hover {
  background: rgba(201, 106, 74, 0.22);
  border-color: rgba(201, 106, 74, 0.6);
  color: #ffd2c2;
}
.btn--tap.is-tapping {
  background: rgba(201, 106, 74, 0.34);
  border-color: var(--terracotta);
}
.tap__hint {
  margin: 8px 0 0;
  font-size: 11.5px;
  color: var(--cream-muted);
  text-align: center;
}

.actions {
  display: flex;
  gap: 8px;
}
.actions .btn {
  flex: 1 1 0;
  justify-content: center;
}

.readout {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}
.readout summary {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cream-muted);
  cursor: pointer;
  list-style: none;
}
.readout summary::-webkit-details-marker {
  display: none;
}
.readout summary::before {
  content: "▸ ";
  color: var(--amber-deep);
}
.readout[open] summary::before {
  content: "▾ ";
}
.readout dl {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px 12px;
  margin: 12px 0 0;
  font-size: 12.5px;
}
.readout dt {
  color: var(--cream-muted);
}
.readout dd {
  margin: 0;
  font-family: var(--font-mono);
  color: var(--cream);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* ── Prose ────────────────────────────────────────────────────────────── */

.prose {
  max-width: 900px;
  margin: 0 auto;
  padding: 48px 32px 8px;
}
.prose h2 {
  font-size: 20px;
  font-weight: 620;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}
.prose h3 {
  font-size: 14px;
  font-weight: 620;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 28px 0 10px;
}
.prose p {
  color: var(--cream-dim);
  margin: 0 0 14px;
}
.prose b {
  color: var(--cream);
  font-weight: 600;
}
.prose a {
  color: var(--amber-bright);
  text-decoration-color: rgba(232, 163, 61, 0.4);
  text-underline-offset: 3px;
}
.prose code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 1px 5px;
  border-radius: 4px;
  background: rgba(244, 236, 226, 0.07);
  color: var(--amber-bright);
}
.prose__note {
  font-size: 12.5px;
  color: var(--cream-muted);
}

.pipeline {
  counter-reset: step;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.pipeline li {
  counter-increment: step;
  position: relative;
  padding: 10px 14px 10px 42px;
  border-radius: var(--radius-sm);
  background: rgba(244, 236, 226, 0.03);
  border-left: 2px solid var(--amber-deep);
  font-size: 13.5px;
  color: var(--cream-dim);
}
.pipeline li::before {
  content: counter(step);
  position: absolute;
  left: 14px;
  top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--amber);
}

.traps {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 10px;
  font-size: 13.5px;
  color: var(--cream-dim);
}
.traps li::marker {
  color: var(--terracotta);
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 12px;
  margin: 20px 0 8px;
}
.result-card {
  padding: 16px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--espresso-800), var(--espresso-850));
  border: 1px solid var(--line);
  text-align: center;
}
.result-card__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  color: var(--amber-bright);
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}
.result-card__label {
  display: block;
  margin-top: 6px;
  font-size: 11.5px;
  color: var(--cream-muted);
}

/* ── Footer ───────────────────────────────────────────────────────────── */

.footer {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 32px 56px;
  border-top: 1px solid var(--line);
  margin-top: 48px;
  font-size: 12.5px;
  color: var(--cream-muted);
}
.footer p {
  margin: 0 0 6px;
}
.footer a {
  color: var(--cream-dim);
  text-decoration-color: var(--line-strong);
  text-underline-offset: 3px;
}
.footer a:hover {
  color: var(--amber-bright);
}
.footer__meta {
  font-size: 11.5px;
  opacity: 0.75;
}

/* ── Responsive ───────────────────────────────────────────────────────── */

@media (max-width: 1180px) {
  .workspace {
    grid-template-columns: 240px minmax(0, 1fr);
    grid-template-areas:
      "tracks stage"
      "controls controls";
  }
  .panel--tracks {
    grid-area: tracks;
  }
  .panel--stage {
    grid-area: stage;
  }
  .panel--controls {
    grid-area: controls;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 0 24px;
    align-items: start;
  }
  .panel--controls .panel__title {
    grid-column: 1 / -1;
  }
  .panel--controls .toggles {
    border-top: none;
    padding-top: 0;
  }
}

@media (max-width: 820px) {
  .masthead {
    padding: 28px 18px 18px;
  }
  .masthead__links {
    width: 100%;
    gap: 16px;
    font-size: 12.5px;
  }
  .workspace {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "stage"
      "tracks"
      "controls";
    padding: 16px 18px 0;
    gap: 14px;
  }
  .panel--controls {
    grid-template-columns: minmax(0, 1fr);
  }
  .stage__wave {
    min-height: 180px;
  }
  .prose,
  .footer {
    padding-left: 18px;
    padding-right: 18px;
  }
  .masthead h1 {
    font-size: 22px;
  }
  .stage__loop .btn {
    flex: 1 1 auto;
  }
  .loop-status {
    width: 100%;
    margin-left: 0;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 14px;
  }
  .masthead__brand {
    gap: 12px;
  }
  .mark {
    width: 36px;
    height: 36px;
    flex-basis: 36px;
  }
  .transport {
    flex-wrap: wrap;
  }
  .transport__meta {
    width: 100%;
    justify-content: flex-end;
  }
  .field-row {
    grid-template-columns: 1fr;
  }
  .results-grid {
    grid-template-columns: 1fr 1fr;
  }
  .stage__badges {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}