:root {
  --bg: #0a0a0a;
  --text: #f1f0ec;
  --muted: #94928b;
  --rule: #2a2a28;
  --accent: #ff8a3d; /* set per track from the data's own colour */
  --mono: ui-monospace, "Cascadia Mono", "SF Mono", Consolas, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-underline-offset: 3px; }
a:hover { color: var(--accent); }
:focus-visible { outline: 2px solid var(--text); outline-offset: 3px; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip { position: absolute; left: -9999px; top: 8px; background: var(--text); color: #000; padding: 8px 12px; z-index: 10; }
.skip:focus { left: 8px; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* ---------- Hero: the dot Earth ---------- */
.hero { position: relative; height: clamp(320px, 44vw, 540px); overflow: hidden; }
.dots {
  position: absolute; inset: 0; width: 100%; height: 100%;
  image-rendering: pixelated; opacity: 0.72;
}
.hero::after { /* fades the drawing into the page and keeps the title readable */
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    linear-gradient(to top, var(--bg) 0%, rgba(10, 10, 10, 0) 38%),
    linear-gradient(to right, rgba(10, 10, 10, 0.82) 0%, rgba(10, 10, 10, 0) 58%);
}
.hero-text { position: absolute; left: 0; right: 0; bottom: 56px; z-index: 1; }
.hero h1 {
  margin: 0; font-weight: 500; letter-spacing: -0.045em; line-height: 0.95;
  font-size: clamp(3rem, 9.5vw, 7rem);
}
.lead { margin: 18px 0 0; font-size: clamp(1.25rem, 2.6vw, 1.75rem); letter-spacing: -0.01em; }
.sub { margin: 4px 0 0; color: var(--muted); max-width: 46ch; }
.hero-note {
  position: absolute; left: 0; right: 0; bottom: 14px; z-index: 1; margin: 0 auto;
  color: var(--muted); font-size: 0.8rem;
}

/* ---------- Track selector ---------- */
.tracks { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--rule); margin-top: 8px; }
.track {
  text-align: left; cursor: pointer; background: none; border: 0; color: var(--muted); font: inherit;
  padding: 18px 20px 20px 0; border-top: 2px solid transparent; margin-top: -1px;
}
.track + .track { padding-left: 20px; border-left: 1px solid var(--rule); }
.track:hover { color: var(--text); }
.track[aria-pressed="true"] { color: var(--text); border-top-color: var(--accent); }
.track-code { display: block; font: 0.78rem/1 var(--mono); letter-spacing: 0.06em; margin-bottom: 10px; }
.track[aria-pressed="true"] .track-code { color: var(--accent); }
.track-title { display: block; font-size: 1.2rem; letter-spacing: -0.01em; }
.track-line { display: block; font-size: 0.9rem; color: var(--muted); margin-top: 2px; }

/* ---------- Stage ---------- */
.player { margin-top: 8px; }
.stage { position: relative; width: 100%; overflow: hidden; background: #000 center / cover no-repeat; }
.stage video { position: absolute; display: block; max-width: none; object-fit: fill; }
.is-exploring .stage { cursor: crosshair; touch-action: none; outline: 1px solid var(--text); outline-offset: 3px; }
.playhead { position: absolute; pointer-events: none; background: var(--text); opacity: 0.85; }
.playhead.axis-x { top: 0; bottom: 0; width: 1px; transition: left 0.15s linear; }
.playhead.axis-y { left: 0; right: 0; height: 1px; transition: top 0.15s linear; }
.cursor { position: absolute; pointer-events: none; border: 1px solid #fff; box-shadow: 0 0 0 1px #000; }

/* ---------- Controls ---------- */
.controls { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 16px; }
.btn {
  font: inherit; font-size: 0.95rem; padding: 10px 20px; cursor: pointer; border-radius: 2px;
  background: none; color: var(--text); border: 1px solid #5a5953;
}
.btn:hover { border-color: var(--text); }
.btn-solid { background: var(--text); color: #0a0a0a; border-color: var(--text); min-width: 104px; font-weight: 600; }
.btn-solid:hover { background: #fff; }
.btn[aria-pressed="true"]:not(.btn-solid) { background: var(--text); color: #0a0a0a; border-color: var(--text); }
.btn-quiet { border-color: transparent; color: var(--muted); padding-left: 8px; padding-right: 8px; }
.vol { display: inline-flex; align-items: center; gap: 10px; margin-left: auto; color: var(--muted); font-size: 0.9rem; }
.vol input { width: 140px; accent-color: var(--text); }
.vol output { font: 0.85rem var(--mono); min-width: 4ch; }

.readout { margin: 16px 0 0; font-size: 1.15rem; min-height: 1.6em; }
.status { color: var(--muted); font-size: 0.9rem; margin: 10px 0 0; }
.status:empty { display: none; }

/* ---------- Wall label and listening key ---------- */
.columns { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; margin-top: 44px; padding-top: 28px; border-top: 1px solid var(--rule); }
.label h2 { margin: 0 0 10px; font-size: 1.9rem; font-weight: 500; letter-spacing: -0.02em; }
.desc { margin: 0 0 16px; max-width: 52ch; }
.credit { margin: 0; color: var(--muted); font-size: 0.86rem; }

.small-head { margin: 0 0 12px; font-size: 0.78rem; font-weight: 500; letter-spacing: 0.09em; text-transform: uppercase; color: var(--muted); }
.key { margin: 0 0 30px; }
.key-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding: 9px 0; border-top: 1px solid var(--rule); font-size: 0.95rem; }
.key-row:last-child { border-bottom: 1px solid var(--rule); }
.key dt { display: flex; align-items: center; gap: 10px; }
.key dd { margin: 0; color: var(--muted); }
.swatch { flex: none; width: 34px; height: 10px; }
.swatch-line { height: 1px; background: var(--text); }
.swatch-none { height: 0; }

.meters { display: grid; gap: 12px; }
.meter { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; align-items: center; font-size: 0.9rem; }
.meter-label { color: var(--muted); }
.meter-bar { height: 2px; background: var(--rule); }
.meter-bar i { display: block; height: 100%; width: 0; background: var(--accent); transition: width 0.12s linear; }

.how { margin-top: 44px; padding-top: 28px; border-top: 1px solid var(--rule); }
.how p { margin: 0; color: var(--muted); max-width: 78ch; font-size: 0.95rem; }

/* ---------- Tuning (only with ?tune) ---------- */
.tuning-box { margin-top: 44px; padding-top: 28px; border-top: 1px dashed var(--rule); }
.tune-note { color: var(--muted); margin: 0 0 8px; }
.tune-row { display: grid; grid-template-columns: minmax(180px, 300px) 1fr 52px; gap: 12px; align-items: center; margin: 8px 0; font-size: 0.9rem; }
.tune-row input { accent-color: var(--text); }
#tuneOut { display: block; width: 100%; margin-top: 10px; background: #111; color: var(--text); border: 1px solid var(--rule); font: 13px/1.4 var(--mono); }

.foot { color: var(--muted); font-size: 0.82rem; margin-top: 64px; padding-top: 24px; padding-bottom: 56px; border-top: 1px solid var(--rule); }
.foot p { margin: 0 0 6px; max-width: 90ch; }

/* ---------- Small screens ---------- */
@media (max-width: 760px) {
  body { font-size: 16px; }
  .tracks { grid-template-columns: 1fr; }
  .track, .track + .track { padding: 14px 0; border-left: 0; border-top: 1px solid var(--rule); margin-top: 0; }
  .track[aria-pressed="true"] { border-top-color: var(--accent); }
  .columns { grid-template-columns: 1fr; gap: 36px; }
  .vol { margin-left: 0; width: 100%; }
  .hero-text { bottom: 44px; }
  .hero-note { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .playhead, .meter-bar i { transition: none; }
}