:root {
  --bg: #0b0a10;
  --bg-2: #15111c;
  --ink: #f1ead8;
  --accent: #f4a93c;
  --line: rgba(241, 234, 216, 0.1);
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", monospace;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.site-header,
.site-footer {
  max-width: 900px;
  margin-inline: auto;
  padding: 2.5rem 1.5rem 1.5rem;
  text-align: center;
}

.eyebrow {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.25em;
  font-size: 0.7rem;
  color: var(--accent);
}

h1 {
  font-size: clamp(2.2rem, 6vw, 3.2rem);
  margin: 0.4rem 0;
}

.lede {
  color: rgba(241, 234, 216, 0.7);
  max-width: 50ch;
  margin-inline: auto;
}

#app {
  max-width: 900px;
  margin-inline: auto;
  padding: 0 1.5rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ---------- transport ---------- */

.transport {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: center;
}

.btn {
  font-family: var(--font-mono);
  background: var(--bg-2);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.6rem 1.1rem;
  cursor: pointer;
  font-size: 0.85rem;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.btn--play {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
  font-weight: 600;
}

/* ---------- knobs (rotation is computed and set by knob.js) ---------- */

.knobs {
  display: flex;
  gap: 1.8rem;
  justify-content: center;
  flex-wrap: wrap;
  padding: 0.6rem 0;
}

.knob {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
}

.knob__dial {
  --angle: -135deg;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, var(--bg-2), #0c0a10);
  border: 1px solid var(--line);
  position: relative;
  cursor: ns-resize;
  touch-action: none;
}
.knob__dial:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.knob__indicator {
  position: absolute;
  top: 6px;
  left: 50%;
  width: 3px;
  height: 16px;
  background: var(--accent);
  border-radius: 2px;
  transform-origin: 50% 21px;
  transform: translateX(-50%) rotate(var(--angle));
}

.knob__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: rgba(241, 234, 216, 0.6);
}

.knob__value {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
}

/* ---------- sequencer grid (rows + cells are created by sequencer-ui.js) ---------- */

.sequencer {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  background: var(--bg-2);
  border-radius: 16px;
  padding: 1.2rem;
  border: 1px solid var(--line);
}

.grid__row {
  display: grid;
  grid-template-columns: 70px 1fr;
  align-items: center;
  gap: 0.8rem;
}

.grid__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--track-color, var(--accent));
}

.grid__cells {
  display: grid;
  grid-template-columns: repeat(16, 1fr);
  gap: 4px;
}

.cell {
  aspect-ratio: 1;
  border-radius: 5px;
  border: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
  padding: 0;
}
.cell--beat { border-color: rgba(241, 234, 216, 0.25); }
.cell--active { background: var(--track-color, var(--accent)); border-color: var(--track-color, var(--accent)); }
.cell--playhead { box-shadow: 0 0 0 2px var(--ink) inset; }
.cell:focus-visible { outline: 2px solid var(--ink); outline-offset: 1px; }

/* ---------- visualizer (pixels are painted frame-by-frame by visualizer.js) ---------- */

.visualizer {
  width: 100%;
  height: 120px;
  display: block;
  background: var(--bg-2);
  border-radius: 16px;
  border: 1px solid var(--line);
}

/* ---------- footer ---------- */

.site-footer {
  color: rgba(241, 234, 216, 0.5);
  font-size: 0.85rem;
}
.site-footer a { color: var(--accent); text-decoration: none; }

kbd {
  font-family: var(--font-mono);
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0 0.3rem;
}

@media (max-width: 600px) {
  .grid__row { grid-template-columns: 50px 1fr; }
  .grid__cells { gap: 2px; }
  .knobs { gap: 1.2rem; }
}