/* Chronosphere: dark "night sky instrument" look shared with the README art. */

:root {
  --bg0: #050810;
  --bg1: #0a1120;
  --bg2: #111c33;
  --line: #1c2a47;
  --line2: #2b4070;
  --ink: #dbe7ff;
  --dim: #8da0c4;
  --faint: #51648c;
  --cyan: #46e0ff;
  --mint: #4ff0b4;
  --gold: #ffc857;
  --violet: #a287ff;
  --pink: #ff5f9e;
  --orange: #ff9f45;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --radius: 16px;
  --gutter: clamp(16px, 4vw, 40px);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { background: var(--bg0); scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font: 16px/1.6 var(--sans);
  background:
    radial-gradient(1100px 640px at 88% -8%, rgba(70, 224, 255, 0.11), transparent 62%),
    radial-gradient(900px 600px at -8% 24%, rgba(162, 135, 255, 0.11), transparent 62%),
    linear-gradient(180deg, var(--bg1), var(--bg0) 62%);
  background-attachment: fixed;
  overflow-x: hidden;
}
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 6px; }
p { margin: 0 0 1em; }
h1, h2, h3 { margin: 0; line-height: 1.15; }

.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip { position: absolute; left: 12px; top: -48px; z-index: 50; padding: 8px 14px; background: var(--bg2); border: 1px solid var(--cyan); border-radius: 8px; transition: top 0.15s; }
.skip:focus { top: 12px; }
#stars { position: fixed; inset: 0; width: 100%; height: 100%; z-index: -1; pointer-events: none; }
.noscript { margin: 24px var(--gutter); padding: 16px; border: 1px solid var(--line2); border-radius: 12px; background: var(--bg2); }

/* ---------------------------------------------------------------- top bar */
.top {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 12px var(--gutter);
  background: linear-gradient(180deg, rgba(5, 8, 16, 0.92), rgba(5, 8, 16, 0.6));
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(28, 42, 71, 0.7);
}
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--cyan); font: 700 12px/1 var(--mono); letter-spacing: 0.28em; }
.brand:hover { text-decoration: none; }
.top nav { display: flex; align-items: center; gap: clamp(10px, 2vw, 22px); font: 600 12px/1 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; }
.top nav a { color: var(--dim); padding: 8px 2px; }
.top nav a:hover { color: var(--ink); text-decoration: none; }
.top nav .cta { color: var(--pink); border: 1px solid rgba(255, 95, 158, 0.55); border-radius: 999px; padding: 8px 14px; }
.top nav .cta:hover { background: rgba(255, 95, 158, 0.12); }
@media (max-width: 640px) { .top nav a:not(.cta) { display: none; } }

/* ---------------------------------------------------------------- hero */
main { padding-bottom: 40px; }
.hero, .band, .foot { width: min(1240px, 100% - 2 * var(--gutter)); margin-inline: auto; }
.hero { padding-top: clamp(22px, 4vw, 48px); }
.eyebrow { margin: 0 0 14px; font: 700 11px/1.4 var(--mono); letter-spacing: 0.24em; color: var(--dim); text-transform: uppercase; }
.live-dot { display: inline-block; width: 7px; height: 7px; margin-right: 8px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 10px var(--mint); animation: pulse 2s ease-in-out infinite; vertical-align: 1px; }
@keyframes pulse { 50% { opacity: 0.35; } }

#wordmark { display: block; width: 100%; height: 96px; margin: 4px 0 6px; cursor: crosshair; touch-action: pan-y; }
.tagline { min-height: 1.6em; margin: 8px 0 14px; color: var(--gold); font: 600 clamp(14px, 1.7vw, 18px)/1.4 var(--mono); letter-spacing: 0.04em; transition: opacity 0.35s; }
.tagline.out { opacity: 0; }
.lede { max-width: 72ch; color: #b9c8e6; font-size: clamp(15px, 1.4vw, 17px); }
.lede strong { color: var(--ink); font-weight: 600; }

.stage { display: grid; gap: 18px; margin-top: 26px; grid-template-columns: minmax(0, 1fr); }

.panel, .card {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    repeating-linear-gradient(180deg, rgba(255, 255, 255, 0.028) 0 1px, transparent 1px 4px),
    linear-gradient(160deg, var(--bg2), var(--bg1) 55%, var(--bg0));
  box-shadow: 0 18px 50px -24px rgba(0, 0, 0, 0.8), inset 0 1px 0 rgba(255, 255, 255, 0.04);
}
.panel { display: flex; flex-direction: column; overflow: hidden; }
.panel-head, .panel-foot { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 18px; font: 600 10.5px/1.3 var(--mono); letter-spacing: 0.16em; text-transform: uppercase; }
.panel-head { padding-bottom: 4px; }
.panel-foot { padding-top: 6px; color: var(--dim); flex-wrap: wrap; row-gap: 6px; }
.tag { display: inline-flex; align-items: center; gap: 9px; font-weight: 700; letter-spacing: 0.2em; white-space: nowrap; flex: none; }
.panel-head > :last-child:not(.tag) { text-align: right; text-wrap: balance; }
.tag.cyan { color: var(--cyan); }
.tag.gold { color: var(--gold); }
.tag .mark { width: 11px; height: 11px; border: 1.5px solid currentColor; border-radius: 50%; position: relative; }
.tag .mark::after { content: ""; position: absolute; left: 3.5px; top: 1.5px; width: 1.5px; height: 4px; background: currentColor; border-radius: 1px; box-shadow: 2px 3px 0 -0.2px currentColor; }
.info { color: var(--dim); text-align: right; }
.hint { color: var(--cyan); }
.mono-dim { color: var(--dim); }
.mono-cyan { color: var(--cyan); }
.score { color: var(--dim); font-variant-numeric: tabular-nums; }
.score b { font-weight: 700; }
.score .past { color: #26c281; }
.score .future { color: #6dffb4; }

.canvas-wrap { position: relative; padding: 0 6px; flex: 1; display: flex; align-items: center; }
.canvas-wrap #grid { flex: 1; }
.grid-panel { container-type: inline-size; }
.stats { list-style: none; margin: 4px 14px 0; padding: 12px 4px 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px 10px; border-top: 1px solid var(--line); }
@container (min-width: 560px) { .stats { grid-template-columns: repeat(6, minmax(0, 1fr)); } }
.stats li { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.stats b { font: 700 clamp(17px, 2vw, 22px)/1.1 var(--mono); color: var(--ink); letter-spacing: -0.01em; font-variant-numeric: tabular-nums; }
.stats span { font: 600 9px/1.3 var(--mono); letter-spacing: 0.16em; text-transform: uppercase; color: var(--faint); text-wrap: balance; }
.stats li:nth-child(1) b { color: var(--mint); }
.stats li:nth-child(2) b { color: var(--cyan); }
.stats li:nth-child(3) b { color: var(--violet); }
.stats li:nth-child(4) b { color: var(--pink); }
.stats li:nth-child(5) b { color: var(--gold); }
#grid { display: block; width: 100%; cursor: pointer; border-radius: 10px; touch-action: pan-y; }
#grid.playing { touch-action: none; cursor: ns-resize; }
#grid.over-cube { cursor: grab; }
#grid.over-cube:active { cursor: grabbing; }
.tip {
  position: absolute; z-index: 5; pointer-events: none; transform: translate(-50%, -100%);
  padding: 6px 10px; border: 1px solid var(--line2); border-radius: 8px; background: rgba(5, 8, 16, 0.94);
  font: 600 11px/1.3 var(--mono); letter-spacing: 0.06em; white-space: nowrap; color: var(--ink);
}
.tip b { color: var(--mint); }

.cube-panel { min-height: 340px; }
.cube-panel.lab { margin-top: 16px; }
.cube-panel.lab .cube-stage { min-height: 360px; }
.tag.mint { color: var(--mint); }
.cube-stage { position: relative; flex: 1; min-height: 280px; width: 100%; cursor: grab; outline-offset: -4px; touch-action: none; }
.cube-stage:active { cursor: grabbing; }
.cube-stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.cube-stage::before {
  content: ""; position: absolute; inset: 6% 6% 14%; border-radius: 50%; pointer-events: none;
  background: radial-gradient(closest-side, rgba(109, 255, 180, 0.14), rgba(38, 194, 129, 0.06) 55%, transparent 80%);
  transition: opacity 0.6s; opacity: 0.8;
}
.cube-stage.solved::before { background: radial-gradient(closest-side, rgba(109, 255, 180, 0.3), rgba(38, 194, 129, 0.1) 55%, transparent 80%); opacity: 1; }
.cube-fallback { position: absolute; inset: 10%; width: 80%; height: 80%; object-fit: contain; }

/* ---------------------------------------------------------------- console */
.console { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 22px; margin-top: 18px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
button, .btn { font: inherit; }
.chips button, .tm button {
  appearance: none; cursor: pointer; color: var(--dim); background: rgba(17, 28, 51, 0.7);
  border: 1px solid var(--line); border-radius: 999px; padding: 8px 14px;
  font: 700 11px/1 var(--mono); letter-spacing: 0.14em; text-transform: uppercase;
  transition: color 0.15s, border-color 0.15s, background 0.15s, box-shadow 0.15s;
}
.chips button:hover, .tm button:hover { color: var(--ink); border-color: var(--line2); }
.chips button[aria-checked="true"], .tm button[aria-pressed="true"] { color: #06101c; background: var(--cyan); border-color: var(--cyan); box-shadow: 0 0 18px -4px var(--cyan); }
.chips.zones button[aria-checked="true"] { background: var(--gold); border-color: var(--gold); box-shadow: 0 0 18px -4px var(--gold); }
.tm { display: inline-flex; flex-wrap: wrap; align-items: center; gap: 6px; padding: 6px 8px 6px 14px; border: 1px dashed var(--line2); border-radius: 999px; margin-left: auto; }
.tm-label { margin-right: 4px; color: var(--violet); font: 700 10px/1 var(--mono); letter-spacing: 0.2em; }
.tm button { padding: 7px 10px; font-size: 10.5px; }
.tm button.now { color: var(--mint); border-color: rgba(79, 240, 180, 0.5); }
.tm .sep { width: 1px; height: 18px; background: var(--line2); margin: 0 4px; }
.tm-state { min-width: 8ch; padding: 0 8px; font: 700 10.5px/1 var(--mono); letter-spacing: 0.14em; color: var(--mint); text-align: center; }
.tm-state.warp { color: var(--pink); }
@media (max-width: 1100px) { .tm { margin-left: 0; } }

/* ---------------------------------------------------------------- sections */
.band { padding-top: clamp(48px, 7vw, 96px); }
.sec-head { max-width: 70ch; margin-bottom: 26px; }
.sec-head h2 { font-size: clamp(24px, 3.4vw, 38px); letter-spacing: -0.01em; margin-bottom: 12px; }
.sec-head p:last-child { color: #a9bad8; margin-bottom: 0; }

.inst-grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 16px; }
.inst { grid-column: span 6; display: flex; flex-direction: column; overflow: hidden; }
.inst.wide { grid-column: span 7; }
.inst.narrow { grid-column: span 5; }
.inst.half { grid-column: span 6; }
@media (max-width: 960px) { .inst, .inst.wide, .inst.narrow, .inst.half { grid-column: span 12; } }
.inst header { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; padding: 14px 18px 0; font: 700 10.5px/1.3 var(--mono); letter-spacing: 0.2em; text-transform: uppercase; }
.inst header h3 { font: inherit; color: var(--accent, var(--cyan)); }
.inst header span { color: var(--faint); font-weight: 600; letter-spacing: 0.12em; text-align: right; }
.inst canvas { display: block; width: 100%; height: 280px; touch-action: pan-y; }
.inst.tall canvas { height: 320px; }
.inst.short canvas { height: 190px; }
.inst footer { padding: 0 18px 14px; color: var(--dim); font: 600 10px/1.4 var(--mono); letter-spacing: 0.14em; text-transform: uppercase; }

.work { list-style: none; margin: 0; padding: 0; display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.work-card { padding: 0; transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s; }
.work-card a { display: flex; flex-direction: column; gap: 8px; height: 100%; padding: 20px 20px 16px; color: inherit; }
.work-card a:hover { text-decoration: none; }
.work-card:hover { transform: translateY(-3px); border-color: var(--cyan); box-shadow: 0 18px 50px -22px rgba(70, 224, 255, 0.5); }
.work-card h3 { font: 700 18px/1.2 var(--sans); color: var(--ink); }
.work-card p { margin: 0; color: #a9bad8; font-size: 14.5px; flex: 1; }
.work-card .stat { color: var(--cyan); font: 700 10.5px/1.3 var(--mono); letter-spacing: 0.16em; text-transform: uppercase; min-height: 1.3em; }
.work-card.all { border-style: dashed; }

.split { display: grid; gap: 28px; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); align-items: start; }
@media (max-width: 860px) { .split { grid-template-columns: minmax(0, 1fr); } }
.principles { list-style: none; margin: 0; padding: 0; counter-reset: p; display: grid; gap: 12px; }
.principles li { counter-increment: p; display: grid; grid-template-columns: 38px 1fr; align-items: center; padding: 14px 16px; border: 1px solid var(--line); border-radius: 12px; background: rgba(17, 28, 51, 0.5); color: #cfdbf3; }
.principles li::before { content: "0" counter(p); color: var(--gold); font: 700 12px/1 var(--mono); letter-spacing: 0.1em; }
.support { padding: 22px; }
.support .eyebrow { color: var(--pink); }
.support p { color: #b9c8e6; }
.support .fine { margin: 18px 0 0; padding-top: 14px; border-top: 1px solid var(--line); color: var(--dim); font-size: 14px; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; }
.btn { display: inline-block; padding: 10px 16px; border: 1px solid var(--line2); border-radius: 999px; color: var(--ink); font: 700 11px/1 var(--mono); letter-spacing: 0.14em; text-transform: uppercase; }
.btn:hover { text-decoration: none; border-color: var(--cyan); color: var(--cyan); }
.btn.pink { border-color: rgba(255, 95, 158, 0.7); color: var(--pink); }
.btn.pink:hover { background: rgba(255, 95, 158, 0.12); color: var(--pink); border-color: var(--pink); }

.foot { padding: 56px 0 44px; color: var(--faint); font: 600 11px/1.7 var(--mono); letter-spacing: 0.08em; }
.foot p { margin: 0 0 4px; }

.toast {
  position: fixed; left: 50%; bottom: 22px; z-index: 40; transform: translate(-50%, 24px); opacity: 0; pointer-events: none;
  max-width: min(92vw, 560px); padding: 11px 18px; border: 1px solid var(--cyan); border-radius: 999px;
  background: rgba(5, 8, 16, 0.94); box-shadow: 0 10px 40px -10px rgba(70, 224, 255, 0.5);
  font: 700 11px/1.4 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink); text-align: center;
  transition: opacity 0.25s, transform 0.25s;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .live-dot { animation: none; }
  .work-card, .toast, .tagline { transition: none; }
}