@font-face{font-family:Inter;src:url('/fonts/inter-roman.woff2') format('woff2');font-style:normal;font-weight:100 900;font-display:block}@font-face{font-family:Inter;src:url('/fonts/inter-italic.woff2') format('woff2');font-style:italic;font-weight:100 900;font-display:block}/* Standalone lab route: complete local surface, shared palette and navigation geometry. */

:root{font-family:Inter,Arial,sans-serif;color-scheme:dark;background:#09090b;color:#f5f3fa;--muted:#c8c3d8;--line:#ffffff30;--accent:#8b80ff}*{box-sizing:border-box}body{margin:0;line-height:1.65}h1,h2,p,dl,dd{margin:0}h1,h2{line-height:1.08;letter-spacing:-.035em;font-weight:300}h1{font-size:clamp(40px,6vw,80px);text-wrap:balance}h2{font-size:clamp(24px,3vw,36px)}p{color:var(--muted)}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button,select{min-height:44px;padding:10px 16px;border:1px solid var(--line);border-radius:var(--control-radius);background:#181522;color:inherit}button:disabled{cursor:default;color:#a89db8}button:not(:disabled):hover,select:hover{border-color:#f5f3fa}button[aria-pressed=true]{background:var(--accent);border-color:var(--accent);color:#09090b}button:focus-visible,select:focus-visible,a:focus-visible,input:focus-visible{outline:2px solid #f5f3fa;outline-offset:4px}::selection{background:var(--accent);color:#09090b}html{scrollbar-color:#8b80ff80 #09090b;scrollbar-width:thin;scroll-padding-top:24px}input{accent-color:var(--accent);caret-color:var(--accent)}[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}.skip{position:fixed;top:-100px;left:24px;z-index:20;padding:12px;background:var(--accent);color:#09090b}.skip:focus{top:12px}.section{max-width:1440px;margin:auto;padding-inline:clamp(24px,5vw,80px)}svg{width:22px;height:22px;stroke:currentColor;stroke-width:1.4;flex:none}.text-link{display:inline-flex;gap:16px;align-items:center;min-height:44px;color:var(--accent)}
.lab{padding-top:80px;padding-bottom:100px}.lab-intro{max-width:850px;display:grid;gap:24px;padding-bottom:64px}.lab-intro>p{max-width:65ch;font-size:19px}.lab-intro .lab-disclosure{font-size:14px;max-width:70ch}.lab-stage{padding:32px;border:1px solid #8b80ff33;border-radius:24px;background:#12101b}.lab-settings,.lab-modes,.lab-controls{display:flex;align-items:center;gap:16px;flex-wrap:wrap}.lab-settings{justify-content:space-between;gap:24px}.lab-settings label,.lab-controls label{display:flex;align-items:center;gap:12px;font-size:14px}.lab-controls input{width:20px;height:20px;min-height:20px}.lab-controls select{max-width:100%}[data-lab-context]{padding-block:24px 40px;max-width:72ch}.lab-workspace{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:40px}.lab-workspace>div{min-width:0}.lab-workspace h2+p{padding-top:16px}.lab-pieces{display:flex;flex-wrap:wrap;gap:12px;padding-block:24px}.lab-pieces button{display:flex;align-items:center;justify-content:space-between;gap:16px;min-width:112px;min-height:72px;text-align:left;padding:12px 20px;border-color:#8b80ff44;background:#1b1729}.lab-pieces span{font-size:12px;color:#c8c3d8}.lab-pieces strong{font-size:26px;letter-spacing:.03em;font-variant-numeric:tabular-nums}.lab-pieces [data-state=candidate]{border-color:#8b80ff}.lab-pieces [data-state=used]{border-color:#7effde;background:#7effde18}.lab-pieces [aria-pressed=true]{background:var(--accent);border-color:var(--accent);color:#09090b}.lab-pieces [aria-pressed=true] span{color:#09090b}.lab-pieces [data-state=blocked]{opacity:.5}.lab-modes{padding:4px;background:#09090b;border-radius:var(--control-radius);gap:4px}.lab-modes button{border-color:transparent}.lab-controls{padding-bottom:24px}.lab-chain{padding-block:24px 32px;border-top:1px solid var(--line)}[data-chain-text]{font-size:clamp(24px,3vw,36px);font-variant-numeric:tabular-nums;overflow-wrap:anywhere;color:#ede9f5;padding-block:16px 8px}[data-chain-ids]{overflow-wrap:anywhere;letter-spacing:.04em}.lab-feedback{padding-top:24px;min-height:80px;color:#8b80ff}.lab-explanation{display:grid;align-content:start;gap:24px;padding-left:32px;border-left:1px solid #8b80ff33}.lab-explanation>p{max-width:48ch}.lab-metrics{display:grid;gap:16px}.lab-metrics>div{display:flex;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line);padding-bottom:12px}.lab-metrics dd{font-variant-numeric:tabular-nums;color:#ede9f5}.lab-rules{max-width:850px;padding-top:64px;display:grid;gap:24px}.lab-rules ol{margin:0;padding-left:24px;color:var(--muted)}.lab-rules li+li{padding-top:12px}[data-lab-confirm]{padding-block:24px;border-bottom:1px solid var(--line)}[data-lab-confirm] p{padding-bottom:16px}[data-lab-confirm] button{margin-right:12px}@media(max-width:850px){.lab-workspace{grid-template-columns:1fr;gap:40px}.lab-explanation{padding-left:0;padding-top:32px;border-left:0;border-top:1px solid #8b80ff33}.lab{padding-top:48px}.lab-intro{padding-bottom:40px}}@media(max-width:500px){.lab-settings label{flex-wrap:wrap}.lab-settings select{width:100%}.lab-settings>label,.lab-settings select{max-width:100%}.lab-modes{gap:12px}.lab-stage{padding:20px}.lab-pieces{gap:8px}.lab-pieces button{min-width:96px;min-height:64px;padding:10px 16px}.lab-controls label{flex-wrap:wrap}.lab-intro>p{font-size:17px}}@view-transition{navigation:none}
/* A single scene light grounds selected pieces; no per-tile animation loop. */
.lab-pieces button{transform:translateY(calc(var(--raise,0)* -6px));box-shadow:calc(var(--light-x,0)* -6px) calc(5px + var(--raise,0)*9px - var(--light-y,0)*3px) calc(10px + var(--raise,0)*8px) #09090b88}.lab-pieces [data-state=active]{border-color:#8b80ff;color:#8b80ff}.lab-pieces [data-state=pruned]{border-color:#7effde;color:#7effde;background:#7effde0d}[data-decision=prune] .lab-chain{border-color:#7effde}[data-decision=best] .lab-chain,[data-decision=done] .lab-chain{border-color:#8b80ff}

@media(max-width:600px){}

.poster-banner{height:clamp(160px,24vw,320px);overflow:hidden}.poster-banner img{width:100%;height:100%;object-fit:cover}
/* Keep native keyboard/selection behavior while theming supported pickers. */
.lab select{min-width:0;max-width:100%;box-shadow:none}.lab select:focus-visible{outline:2px solid #7effde;outline-offset:3px}
@supports(appearance:base-select){.lab select,.lab select::picker(select){appearance:base-select}.lab select{gap:16px;align-items:center}.lab select::picker(select){background:#181522;color:#f5f3fa;border:1px solid #8b80ff66;border-radius:16px;padding:6px;margin-top:8px;max-inline-size:calc(100vw - 32px);box-shadow:0 12px 32px #09090b80}.lab select option{min-height:44px;padding:10px 16px;border-radius:10px;white-space:normal;overflow-wrap:anywhere}.lab select option:checked{background:#8b80ff;color:#09090b}.lab select option:hover,.lab select option:focus{background:#7effde;color:#09090b}.lab select::picker-icon{color:#7effde}}