:root{color-scheme:dark;--bg:#0b1119;--surface:#121d28;--ink:#edf3f5;--muted:#abbac8;--line:#2c3f50;--accent:#b5e5df}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 system-ui,-apple-system,sans-serif}a{color:var(--accent);text-underline-offset:4px}button,select,input{font:inherit}button,select{min-height:44px;border:1px solid #476074;background:#182735;color:var(--ink);border-radius:6px;padding:9px 13px}button{cursor:pointer}button:hover,button[aria-pressed=true]{background:#b5e5df;color:#10262a;border-color:#b5e5df}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #f0c684;outline-offset:4px}header,main,footer{max-width:1320px;margin:auto}header,footer{display:flex;justify-content:space-between;gap:24px;padding:28px 40px}header{border-bottom:1px solid var(--line);font-size:14px}header a{text-decoration:none}main{padding:44px 40px}.intro{display:grid;grid-template-columns:1.15fr 1fr;align-items:end;gap:48px;margin-bottom:36px}.eyebrow{text-transform:uppercase;font-size:12px;letter-spacing:.12em;font-weight:650;color:var(--accent);margin:0 0 16px}h1{font-size:52px;line-height:1.1;font-weight:550;letter-spacing:-.025em;margin:0}em{font-style:normal;color:var(--accent)}.lede{max-width:490px;color:var(--muted);font-size:18px;margin:0 0 5px}.lab{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(310px,1fr);gap:28px;align-items:start}.viewport{position:sticky;top:20px;background:#111e2b;border:1px solid var(--line);border-radius:12px;overflow:hidden;min-width:0}.scene-heading{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;padding:20px 24px;font-size:13px;color:#b7c9d6}.scene-heading b{color:var(--ink);padding-left:8px}#cube{display:block;width:100%;height:410px;touch-action:pan-y}.scene-key{display:flex;gap:22px;padding:12px 24px;font-size:12px;color:var(--muted)}.scene-key span{display:flex;gap:8px;align-items:center}.scene-key i{width:10px;height:10px;border-radius:2px;background:#b5e5df}.scene-key .context{background:transparent;border:1px solid #8298ab}.view-controls{display:flex;flex-wrap:wrap;gap:8px;border-top:1px solid var(--line);padding:16px 24px}.view-controls button{font-size:13px}.view-controls label{display:flex;gap:12px;align-items:center;width:100%;margin-top:8px;color:var(--muted);font-size:13px}.view-controls input{flex:1;min-width:60px;accent-color:var(--accent);min-height:30px}.hint{font-size:12px;color:var(--muted);margin:0;padding:0 24px 20px;min-height:58px}.controls{min-width:0}.presets{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:22px}.presets button{font-size:13px}.axis-control{display:grid;grid-template-columns:1fr 1.35fr;gap:10px;align-items:center;margin:12px 0}.axis-control label{font-size:13px;color:var(--muted)}.axis-control b{display:inline-grid;place-content:center;width:30px;height:30px;margin-right:8px;color:#0b1119;background:#e0a881;border-radius:4px}.axis-control.y b{background:#b5e5df}.axis-control.z b{background:#aaaaf0}.axis-control select{width:100%;font-size:13px;min-width:0}.result{border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:24px 0 16px;padding:20px 0}.result code{color:#c9d9e3;font-size:15px}.result-label{font-size:12px;color:var(--muted);margin:20px 0 4px}#shape{font-size:38px;line-height:1.2;font-weight:500;font-family:ui-monospace,monospace;color:var(--accent)}#explanation{font-size:14px;color:#c1d0db;margin-bottom:12px}#axis-summary{font:12px/1.6 ui-monospace,monospace;color:var(--muted);margin:0}.index-picker{display:grid;gap:8px;font-size:13px;color:var(--muted)}.index-picker select{width:100%;font-size:13px}.scope,.source-note{font-size:12px;color:var(--muted)}.scope{margin-top:20px}.why{display:grid;grid-template-columns:1fr 1.2fr;gap:72px;margin-top:70px;padding-top:40px;border-top:1px solid var(--line)}h2{font-size:32px;line-height:1.2;font-weight:550;margin:0 0 20px}.why p{color:var(--muted);font-size:15px}.why a{font-size:14px}dl{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin:0 0 25px}dt{font-size:12px;color:var(--muted)}dd{font:28px/1.6 ui-monospace,monospace;margin:8px 0}.wrong{color:#eab497}.right{color:var(--accent)}.source-note{margin-top:32px;max-width:900px}footer{font-size:13px;border-top:1px solid var(--line);padding-bottom:40px}#loading{padding:20px;color:var(--muted);font-size:14px}#loading[hidden]{display:none}.skip{position:absolute;top:-100px;padding:12px;background:var(--surface);z-index:5}.skip:focus{top:10px}.no-js{border:1px solid var(--line);padding:24px}select:disabled{opacity:.6}@media(max-width:1000px){main{padding:32px 24px}.intro{gap:28px}h1{font-size:44px}.lede{font-size:16px}.lab{grid-template-columns:1fr 1fr;gap:20px}.scene-heading,.view-controls,.scene-key{padding-left:16px;padding-right:16px}#cube{height:370px}.axis-control{grid-template-columns:1fr;gap:5px}.why{gap:32px}header,footer{padding-left:24px;padding-right:24px}}@media(max-width:700px){header{font-size:12px;padding:20px}.intro,.lab,.why{grid-template-columns:1fr}.intro{gap:20px;margin-bottom:24px}main{padding:28px 20px}.eyebrow{font-size:11px}h1{font-size:38px}.viewport{position:relative;top:auto}.controls{padding-top:10px}#cube{height:330px}.axis-control{grid-template-columns:1fr 1.4fr;gap:8px}.scene-heading{font-size:12px}.scene-key{gap:15px}.view-controls{padding:14px}.why{gap:18px;margin-top:36px;padding-top:28px}h2{font-size:28px}footer{padding:24px 20px;flex-wrap:wrap}.source-note{font-size:12px}#shape{font-size:34px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}}
:where([hidden]){display:none!important}
.scene-output{margin:0;padding:0 24px;font-size:12px;color:var(--muted)}.scene-output strong{margin-left:10px;font:15px ui-monospace,monospace;color:var(--accent)}
#scene-play{background:var(--accent);color:#10262a}
.example-player{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:24px 0;margin-bottom:32px}.player-heading{display:flex;justify-content:space-between;align-items:center;gap:20px}.player-heading .eyebrow{margin-bottom:8px}.player-heading h2{font-size:23px;margin:0}.player-buttons{display:flex;align-items:center;gap:10px;flex-wrap:wrap}#play-example{background:var(--accent);color:#10262a;min-width:145px}.player-buttons output{font:12px ui-monospace,monospace;color:var(--muted)}#step-copy{color:var(--muted);font-size:14px;margin:14px 0}.example-timeline{display:flex;align-items:center;gap:16px;font-size:12px;color:var(--muted)}.example-timeline input{flex:1;accent-color:var(--accent);min-width:40px;height:32px}.example-chapters{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}.example-chapters button{font-size:12px;background:transparent}.example-chapters button[aria-current=step]{border-color:var(--accent);color:var(--accent)}@media(max-width:700px){.player-heading{align-items:flex-start;flex-direction:column}.player-heading h2{font-size:21px}.example-player{padding:20px 0}.example-chapters{gap:5px}.example-chapters button{padding:8px;font-size:11px}}