:root {
  --bg: #06111c;
  --panel: #0c1c2b;
  --line: #1c3247;
  --text: #e4edf5;
  --muted: #8ca3b7;
  --warm: #ff6a3d;
  --cool: #3fa2ff;
  --neutral: #5d7184;
  --co2: #9fe27c;
  --accent: #ffd166;
  --ocean: #0f3350;
  --land: #2a3a2f;
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  background: radial-gradient(1200px 600px at 70% -10%, #0f2a40 0%, var(--bg) 60%) fixed, var(--bg);
  color: var(--text);
  font: 15px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 16px 56px;
}

a { color: var(--accent); }

.eyebrow {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
}

h1 {
  margin: 6px 0 10px;
  font-size: clamp(32px, 6vw, 52px);
  line-height: 1.05;
  letter-spacing: -.02em;
}

.lede { max-width: 68ch; margin: 0; color: #c3d2df; }

.readout {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin: 28px 0 16px;
}

.stat {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
}

.label {
  display: block;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .04em;
}

.value {
  display: block;
  font-size: 22px;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.value.warm { color: var(--warm); }
.value.cool { color: var(--cool); }

.chart-wrap {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 8px;
}

#chart {
  display: block;
  width: 100%;
  height: clamp(240px, 42vw, 400px);
  cursor: crosshair;
  touch-action: pan-y;
}

.status {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  margin: 0;
  color: var(--muted);
}

.tooltip {
  position: absolute;
  top: 12px;
  pointer-events: none;
  background: rgba(6, 17, 28, .94);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.controls, .jumps, .legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  margin-top: 16px;
}

.controls label { display: flex; align-items: center; gap: 8px; color: var(--muted); }

button, select {
  font: inherit;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 12px;
  cursor: pointer;
}

button:hover:not(:disabled), select:hover { border-color: var(--muted); }
button:disabled { opacity: .5; cursor: default; }

button.primary {
  min-width: 110px;
  background: var(--accent);
  border-color: var(--accent);
  color: #1b1405;
  font-weight: 600;
}

.jumps .label { display: inline; }
.jump-list { display: flex; flex-wrap: wrap; gap: 8px; }
.jump-list button { font-size: 13px; padding: 5px 10px; }
.jump-list button.warm { border-color: color-mix(in srgb, var(--warm) 50%, var(--line)); }
.jump-list button.cool { border-color: color-mix(in srgb, var(--cool) 50%, var(--line)); }

.legend { color: var(--muted); font-size: 13px; }
.sw { display: inline-block; width: 12px; height: 12px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; }
.sw.warm { background: var(--warm); }
.sw.cool { background: var(--cool); }
.sw.neutral { background: var(--neutral); }
.sw.co2 { height: 3px; vertical-align: 3px; background: var(--co2); }

.notes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.notes h2 { margin: 0 0 8px; font-size: 16px; }
.notes ul { margin: 0; padding-left: 18px; color: #c3d2df; }
.notes li { margin-bottom: 6px; }

footer { margin-top: 32px; color: var(--muted); font-size: 13px; }

b.warm, .eq-num.warm { color: var(--warm); }
b.cool { color: var(--cool); }

/* ---------- explainer ---------- */

.explain { margin-top: 48px; }
.section-title { margin: 0 0 20px; font-size: 22px; }

.step {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  gap: 28px;
  align-items: center;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

.step h3 { margin: 6px 0 8px; font-size: 18px; }
.step p { margin: 0; color: #c3d2df; max-width: 52ch; }

.step-num {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: #1b1405;
  font-weight: 700;
  font-size: 14px;
}

.step-visual {
  margin: 0;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
}

.step-visual figcaption { margin-top: 10px; color: var(--muted); font-size: 12px; }

.pacific svg { display: block; width: 100%; height: auto; }
.pacific .nino { opacity: 0; }
.pacific[data-state="nino"] .nino { opacity: 1; }
.pacific[data-state="nino"] .normal { opacity: 0; }
.pacific g { transition: opacity .6s ease; }
.svg-label { fill: var(--text); font: 600 10px system-ui, sans-serif; }
.svg-small { fill: var(--muted); font: 9px system-ui, sans-serif; }

.toggle { display: flex; gap: 8px; margin-top: 12px; }
.toggle button { font-size: 13px; padding: 5px 10px; }
.toggle button.on { border-color: var(--accent); color: var(--accent); }

.equation {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.equation figcaption { flex-basis: 100%; text-align: center; }
.eq-box {
  display: grid;
  justify-items: center;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg);
}
.eq-box.result { border-color: color-mix(in srgb, var(--warm) 60%, var(--line)); }
.eq-num { font-size: 20px; font-weight: 700; font-variant-numeric: tabular-nums; }
.eq-label { color: var(--muted); font-size: 12px; }
.eq-op { color: var(--muted); font-size: 22px; }

.scale {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 92px;
}
.scale .cell {
  flex: 1;
  border-radius: 3px 3px 0 0;
  opacity: .35;
  transition: opacity .15s, transform .15s;
}
.scale .cell.warm { background: var(--warm); }
.scale .cell.cool { background: var(--cool); }
.scale .cell.neutral { background: var(--neutral); }
.scale .cell.on { opacity: 1; transform: scaleY(1.06); transform-origin: bottom; }
.scale-axis {
  display: flex;
  justify-content: space-between;
  margin: 6px 0 10px;
  color: var(--muted);
  font-size: 12px;
}
.try input { width: 100%; accent-color: var(--accent); }
.try-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; margin-top: 10px; }
.try-out { margin: 0; font-variant-numeric: tabular-nums; }
.try-out .warm { color: var(--warm); }
.try-out .cool { color: var(--cool); }

.voices { display: grid; gap: 10px; }
.voice { display: flex; align-items: center; gap: 4px 10px; flex-wrap: wrap; }
.voice span { color: var(--muted); font-size: 13px; }
.hum { margin-top: 6px; }
.hum-bar {
  height: 14px;
  border-radius: 7px;
  background: linear-gradient(90deg, #13261a, #3f6b2e 45%, var(--co2));
}
.hum-labels { display: flex; justify-content: space-between; margin-top: 4px; font-size: 12px; color: var(--muted); }
.hum-caption { font-size: 12px; color: var(--muted); }

/* ---------- for musicians ---------- */

.musicians { margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--line); }
.musicians h3 { margin: 28px 0 10px; font-size: 16px; }
.mu-intro, .mu-text { max-width: 72ch; color: #c3d2df; margin: 0; }
.mu-gate { margin: 0 0 12px; color: var(--muted); font-size: 13px; }

.chain { display: grid; gap: 10px; }
.chain-row { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.chain-row .row-label { width: 100%; color: var(--muted); font-size: 12px; }
.chain-box {
  display: grid;
  padding: 6px 10px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 13px;
}
.chain-box span { color: var(--muted); font-size: 12px; }
.chain-arrow { color: var(--muted); }

.mu-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.mu-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
}
.mu-head { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.mu-head b { flex: 1; }
.mu-head button { font-size: 12px; padding: 4px 9px; }
.mu-card canvas { display: block; width: 100%; background: var(--bg); border-radius: 6px; }
.mu-env { height: 84px; }
.mu-zoom { height: 54px; margin-top: 6px; }
.mu-caption { margin: 4px 0 10px; color: var(--muted); font-size: 11px; }
.mu-card dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 3px 12px;
  margin: 0;
  font-size: 13px;
}
.mu-card dt { color: var(--muted); }
.mu-card dd { margin: 0; font-variant-numeric: tabular-nums; }

.table-scroll { overflow-x: auto; }
.musicians table { border-collapse: collapse; font-size: 13px; font-variant-numeric: tabular-nums; min-width: 460px; }
.musicians th, .musicians td { padding: 5px 14px 5px 0; text-align: left; border-bottom: 1px solid var(--line); }
.musicians th { color: var(--muted); font-weight: 500; }
.musicians td.warm { color: var(--warm); }
.musicians td.cool { color: var(--cool); }
.musicians td.neutral { color: var(--muted); }
.mu-list { margin: 0; padding-left: 18px; color: #c3d2df; max-width: 80ch; }
.mu-list li { margin-bottom: 6px; }

.tech summary { cursor: pointer; font-weight: 600; margin-bottom: 8px; }
.tech ul { font-size: 14px; }

@media (max-width: 720px) {
  .readout { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .notes { grid-template-columns: 1fr; gap: 20px; }
  .value { font-size: 18px; }
  .step { grid-template-columns: 1fr; gap: 16px; }
  .mu-grid { grid-template-columns: 1fr; }
}