:root{
  --lab-bg:#f4f4f0;--lab-paper:#fff;--lab-ink:#111;--lab-dim:#666;--lab-line:#d8d8d1;--lab-accent:#075cff;--lab-soft:#e9efff;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--lab-bg);color:var(--lab-ink);font-family:Inter,"Helvetica Neue",Arial,"Noto Sans SC",sans-serif}.lab-shell{max-width:1380px;margin:0 auto;padding:28px 34px 72px}.lab-top{display:flex;justify-content:space-between;align-items:flex-start;gap:24px;padding:18px 0 30px;border-bottom:2px solid var(--lab-ink)}.lab-back{font-size:13px;color:var(--lab-dim);text-decoration:none}.lab-back:hover{color:var(--lab-accent)}.lab-kicker{margin:26px 0 6px;font:700 12px/1.2 ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.16em;color:var(--lab-accent);text-transform:uppercase}.lab-title{margin:0;font-size:clamp(42px,7vw,92px);line-height:.93;letter-spacing:-.055em;font-weight:800}.lab-intro{max-width:690px;margin:18px 0 0;font-size:15px;line-height:1.8;color:#4c4c4c}.lab-top-side{min-width:190px;text-align:right;font:600 12px/1.65 ui-monospace,SFMono-Regular,Menlo,monospace;color:#666}.lab-top-side strong{display:block;color:#111;font-size:28px;line-height:1}.lab-section{margin-top:42px}.lab-section-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:14px}.lab-section-head h2{margin:0;font-size:18px;letter-spacing:-.02em}.lab-section-head span{font:500 11px ui-monospace,SFMono-Regular,Menlo,monospace;color:#888;text-transform:uppercase;letter-spacing:.1em}.lab-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid var(--lab-line);border-left:1px solid var(--lab-line)}.lab-card{position:relative;min-height:260px;padding:22px;background:var(--lab-paper);border-right:1px solid var(--lab-line);border-bottom:1px solid var(--lab-line);text-decoration:none;color:inherit;overflow:hidden;transition:transform .18s ease,box-shadow .18s ease,background .18s ease}.lab-card:hover{z-index:2;transform:translateY(-3px);box-shadow:0 15px 34px rgba(0,0,0,.09);background:#fff}.lab-card.disabled{cursor:default;background:#efefeb;color:#8b8b86}.lab-card.disabled:hover{transform:none;box-shadow:none}.lab-card-top{display:flex;justify-content:space-between;gap:12px;align-items:start}.lab-index{font:600 12px ui-monospace,SFMono-Regular,Menlo,monospace;color:#999}.lab-badge{font:700 10px ui-monospace,SFMono-Regular,Menlo,monospace;padding:4px 7px;border:1px solid #111;text-transform:uppercase;letter-spacing:.08em}.lab-badge.live{background:#111;color:#fff}.lab-badge.soon{border-color:#aaa;color:#999}.lab-card h3{margin:42px 0 7px;font-size:25px;letter-spacing:-.035em}.lab-card p{margin:0;max-width:330px;font-size:13px;line-height:1.65;color:#666}.lab-card.disabled p{color:#999}.lab-tags{position:absolute;left:22px;right:22px;bottom:20px;display:flex;gap:6px;flex-wrap:wrap}.lab-tag{font:600 10px ui-monospace,SFMono-Regular,Menlo,monospace;padding:3px 7px;background:#f1f1ed;color:#555}.lab-card:hover .lab-tag{background:var(--lab-soft);color:var(--lab-accent)}.lab-glyph{position:absolute;right:18px;bottom:42px;font-size:76px;line-height:1;color:#e8e8e3;font-weight:800;letter-spacing:-.08em;pointer-events:none}.lab-card:hover .lab-glyph{color:#e5ecff}.lab-footer{margin-top:52px;padding-top:18px;border-top:1px solid var(--lab-line);display:flex;justify-content:space-between;gap:20px;color:#777;font-size:12px;line-height:1.6}.lab-footer code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;color:#222}

/* shared simulation shell */
.sim-shell{max-width:1460px;margin:0 auto;padding:24px 28px 56px}.sim-head{display:flex;justify-content:space-between;gap:20px;align-items:flex-start;padding:10px 0 22px;border-bottom:2px solid #111}.sim-head h1{font-size:clamp(30px,4vw,54px);letter-spacing:-.045em;margin:8px 0 5px}.sim-head p{margin:0;max-width:760px;color:#666;line-height:1.65;font-size:13px}.sim-links{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}.sim-links a{border:1px solid #bbb;padding:6px 9px;text-decoration:none;color:#444;font:600 11px ui-monospace,SFMono-Regular,Menlo,monospace}.sim-links a:hover{border-color:#111;color:#111}.sim-layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:16px;margin-top:16px}.sim-stage,.sim-panel{background:#fff;border:1px solid var(--lab-line)}.sim-stage{padding:12px;min-width:0}.sim-toolbar{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:10px}.sim-btns{display:flex;gap:6px;flex-wrap:wrap}.sim-btn{appearance:none;border:1px solid #111;background:#fff;color:#111;padding:7px 11px;font-size:12px;cursor:pointer}.sim-btn.primary{background:#111;color:#fff}.sim-btn:hover{background:#eee}.sim-btn.primary:hover{background:#333}.sim-stats{display:flex;gap:13px;flex-wrap:wrap;font:600 11px ui-monospace,SFMono-Regular,Menlo,monospace;color:#666}.sim-canvas-wrap{position:relative;width:100%;background:#111;aspect-ratio:16/10;overflow:hidden}.sim-canvas-wrap canvas{display:block;width:100%;height:100%;image-rendering:auto;cursor:crosshair}.sim-note{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-top:9px;color:#777;font-size:11px}.sim-side{display:flex;flex-direction:column;gap:10px}.sim-panel{padding:15px}.sim-panel h2{font-size:13px;margin:0 0 14px;text-transform:uppercase;letter-spacing:.08em}.sim-row{margin:0 0 15px}.sim-label{display:flex;justify-content:space-between;gap:10px;font-size:12px;margin-bottom:6px;color:#555}.sim-label strong{color:#111;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.sim-range{width:100%;accent-color:#111}.sim-select{width:100%;padding:8px;border:1px solid #ccc;background:#fff;font-size:12px}.sim-grid2{display:grid;grid-template-columns:1fr 1fr;gap:8px}.sim-explain{font-size:12px;line-height:1.7;color:#555}.sim-equation{padding:10px;background:#f3f3ef;font:500 11px/1.65 ui-monospace,SFMono-Regular,Menlo,monospace;overflow:auto}.sim-chart{width:100%;height:130px;display:block;border:1px solid #ddd;background:#fafafa}.sim-preset-grid{display:grid;grid-template-columns:1fr 1fr;gap:6px}.sim-preset{padding:7px 6px;border:1px solid #ccc;background:#fff;font-size:11px;cursor:pointer}.sim-preset:hover{border-color:#111}.sim-preset.active{background:#111;color:#fff;border-color:#111}
@media(max-width:900px){.lab-shell{padding:18px 16px 48px}.lab-top{flex-direction:column}.lab-top-side{text-align:left}.lab-grid{grid-template-columns:1fr 1fr}.sim-shell{padding:14px}.sim-layout{grid-template-columns:1fr}.sim-side{display:grid;grid-template-columns:1fr 1fr}.sim-head{flex-direction:column}.sim-links{justify-content:flex-start}}@media(max-width:620px){.lab-grid{grid-template-columns:1fr}.lab-card{min-height:230px}.lab-title{font-size:48px}.lab-footer{flex-direction:column}.sim-side{display:block}.sim-panel{margin-bottom:10px}.sim-canvas-wrap{aspect-ratio:1/1}}