:root{--paper:#fff;--ink:#222;--muted:#666;--line:#e5e7eb;--accent:#2563eb;--soft:#f6f7f9}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;line-height:1.6}header{max-width:1440px;margin:auto;min-height:82px;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:24px 32px;border-bottom:1px solid var(--line)}a{color:var(--accent);text-underline-offset:4px}header a{font-weight:700;text-decoration:none}.edition{font-size:14px;font-weight:400}main{display:grid;grid-template-columns:minmax(0,1fr) 340px;max-width:1440px;margin:auto}.stage{min-height:740px;position:relative;overflow:hidden;border-right:1px solid var(--line)}#viewport{position:absolute;inset:0}canvas{display:block;width:100%;height:100%;touch-action:none}.intro{position:absolute;top:28px;left:32px;z-index:1;pointer-events:none}.eyebrow{font-size:11px;letter-spacing:.1em;color:var(--muted);margin:0 0 12px}h1{font-weight:700;font-size:clamp(27px,3.2vw,44px);letter-spacing:-.035em;line-height:1.15;margin:0}.deck{font-size:14px;line-height:1.6;color:var(--muted);margin-top:14px}.view-tools{position:absolute;left:32px;bottom:72px;display:flex;gap:6px;flex-wrap:wrap}.view-tools button{font-size:12px;background:#fffffff2;padding:8px 10px}.view-tools button[aria-pressed=true]{background:var(--accent);border-color:var(--accent);color:white}button{font:inherit;cursor:pointer;border:1px solid var(--line);color:var(--ink);border-radius:6px;background:#fff;transition:background .15s}button:hover{border-color:var(--accent);background:var(--soft)}button:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:3px}button:disabled{opacity:.45;cursor:wait}.orbit-hint{position:absolute;bottom:111px;left:32px;font-size:10px;letter-spacing:.06em;color:var(--muted)}.model-caption{position:absolute;left:32px;right:28px;bottom:28px;display:flex;gap:16px;justify-content:space-between;font-size:11px;letter-spacing:.06em}.model-caption span:last-child{color:var(--muted);letter-spacing:0}aside{padding:30px 24px 24px}h2{font-size:25px;font-weight:650;line-height:1.3;margin:0 0 14px;letter-spacing:-.025em}.explain{font-size:13px;line-height:1.65;color:var(--muted);margin:0 0 24px}form label{font-size:13px;display:flex;justify-content:space-between;font-weight:600}output{font-weight:500;color:var(--accent);font-variant-numeric:tabular-nums}input[type=range]{width:100%;accent-color:var(--accent);height:6px;margin:16px 0 24px;cursor:pointer}.control-note{font-size:11px;line-height:1.5;color:var(--muted);margin:-12px 0 20px}.seed-row{display:flex;align-items:center;justify-content:space-between;margin:0 0 20px}.seed-row input{width:90px;padding:7px;background:#fff;border:1px solid var(--line);border-radius:6px;font:inherit;font-size:13px;color:var(--ink)}.primary{width:100%;background:var(--accent);color:white;padding:12px 16px;display:flex;justify-content:space-between;font-size:14px;border-color:var(--accent)}.primary:hover{background:#1d4ed8;color:white}#status{min-height:34px;font-size:12px;line-height:1.4;color:var(--muted);margin:12px 0}.metrics{display:flex;gap:28px;border-top:1px solid var(--line);padding-top:16px}.metrics span{display:block;font-size:10px;letter-spacing:.06em;color:var(--muted);margin-bottom:4px}.metrics strong{font-size:24px;font-weight:600}.metric-note{font-size:11px;line-height:1.5;color:var(--muted);margin:10px 0 18px}.exports{display:grid;grid-template-columns:1fr 1fr;gap:8px}.exports button{padding:9px 5px;font-size:12px}.limitation{font-size:11px;line-height:1.6;color:var(--muted);margin-top:16px}.presets{grid-column:1/-1;border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:grid;grid-template-columns:1.35fr repeat(4,1fr);padding:0 32px}.preset-intro{padding:24px 20px 24px 0}.preset-intro .eyebrow{font-size:10px}.preset-intro p{font-size:15px;margin:7px 0 0}.presets button{border:0;border-left:1px solid var(--line);border-radius:0;text-align:left;padding:24px;position:relative}.presets button>span{font-size:10px;color:var(--muted);position:absolute;top:27px;right:14px}.presets strong{display:block;font-size:19px;font-weight:600}.presets small{display:block;font-size:12px;color:var(--muted);margin-top:6px}.presets button.selected{background:#eff6ff;box-shadow:inset 0 -3px var(--accent)}.presets button:hover{background:#f6f7f9}footer{display:flex;justify-content:space-between;gap:20px;max-width:1440px;margin:auto;padding:24px 32px;font-size:11px;color:var(--muted)}@media(max-width:850px){header{padding:20px}main{grid-template-columns:1fr}.stage{min-height:650px;border-right:0;border-bottom:1px solid var(--line)}.intro{left:24px;top:24px}aside{padding:28px 24px}.presets{padding:0;grid-template-columns:repeat(4,1fr)}.preset-intro{grid-column:1/-1;padding:20px 24px}.presets button{padding:20px 14px}.presets button>span{position:static}.view-tools,.orbit-hint{left:24px}.model-caption{left:24px;right:24px}footer{padding:20px 24px}}@media(max-width:480px){header{font-size:14px}.edition{font-size:12px}.stage{min-height:570px}.deck{font-size:13px}h1{font-size:30px}.view-tools{right:20px;bottom:67px;gap:5px}.view-tools button{padding:7px;font-size:10px}.orbit-hint{bottom:105px}.model-caption{bottom:26px;font-size:9px}.presets strong{font-size:16px}.presets small{font-size:10px}}@media(prefers-reduced-motion:reduce){button{transition:none}}