:root{--ink: #22304a;--ink-soft: #4d5a70;--paper: #f6f1e7;--card: #fffdf8;--line: #ddd3c0;--accent: #d9822b;--accent-ink: #7a3f06;--go: #2f6f5e;--go-ink: #ffffff;--prior: #dfe9f3;--prior-line: #7f9cba;--build: #fff1cf;--build-line: #d9a93a;--target: #f6c66a;--target-line: #a8620b;--right: #e2f2e6;--miss: #fbe7d9;--focus: #1d5fd6;font-family:ui-rounded,Avenir Next,Segoe UI,system-ui,sans-serif;color:var(--ink);background:var(--paper);line-height:1.5}*{box-sizing:border-box}body{margin:0}.app{max-width:980px;margin:0 auto;padding:16px}.masthead h1{font-size:clamp(1.8rem,6vw,2.8rem);line-height:1.1;margin:.2em 0 .3em;letter-spacing:-.01em}.kicker{margin:0;text-transform:uppercase;font-size:.78rem;letter-spacing:.08em;color:var(--accent-ink);font-weight:700}.lede{font-size:1.08rem;max-width:60ch}.note{font-size:.92rem;background:var(--card);border:1px dashed var(--line);border-radius:10px;padding:10px 12px}a{color:var(--accent-ink);text-underline-offset:2px}:focus-visible{outline:3px solid var(--focus);outline-offset:2px}main{display:grid;gap:16px}.panel{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px;min-width:0}.panel h2{margin:0 0 8px;font-size:1.3rem}.panel h2[tabindex]:focus{outline:3px solid var(--focus);outline-offset:2px}.choices{border:0;margin:0 0 12px;padding:0;min-width:0}.choices legend{font-weight:700;margin-bottom:6px;padding:0}.choice-row{display:flex;flex-wrap:wrap;gap:8px}.choice{position:relative;display:inline-flex;align-items:center;min-height:44px;min-width:44px;justify-content:center;padding:8px 14px;border:2px solid var(--line);border-radius:999px;background:#fff;cursor:pointer;font-weight:600}.choice input{position:absolute;opacity:0;top:0;right:0;bottom:0;left:0;margin:0;cursor:pointer}.choice.is-on{background:var(--ink);border-color:var(--ink);color:#fff}.choice:has(input:focus-visible){outline:3px solid var(--focus);outline-offset:2px}.choices:disabled .choice{opacity:.6;cursor:not-allowed}.blurb{margin:0;color:var(--ink-soft);font-style:italic}.btn{min-height:48px;padding:10px 18px;border-radius:12px;border:2px solid var(--ink);background:#fff;color:var(--ink);font:inherit;font-weight:700;cursor:pointer}.btn-go{background:var(--go);border-color:var(--go);color:var(--go-ink)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-wide{width:100%}.btn-ghost{background:transparent}.example-badge{font-size:.9rem;background:var(--build);border-radius:8px;padding:6px 10px;margin:0 0 10px}.graph-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}.graph{display:block;width:100%;min-width:640px;height:auto}.graph .edge{fill:none;stroke:#cbc2b0;stroke-width:1.2}.graph .edge.is-on{stroke:var(--target-line);stroke-width:2.6}.graph .arrow-head{fill:#cbc2b0}.graph .arrow-head-on{fill:var(--target-line)}.graph .node rect{fill:#f3efe6;stroke:#d6cdbb;stroke-width:1}.graph .node text{font-size:13px;fill:#5c5546}.graph .node.is-prior rect{fill:var(--prior);stroke:var(--prior-line);stroke-width:2}.graph .node.is-build rect{fill:var(--build);stroke:var(--build-line);stroke-width:2}.graph .node.is-target rect{fill:var(--target);stroke:var(--target-line);stroke-width:3}.graph .node:not(.is-off) text{fill:var(--ink);font-weight:600}.graph-key{display:flex;flex-wrap:wrap;gap:6px 16px;list-style:none;padding:0;margin:10px 0;font-size:.88rem}.key{display:inline-block;width:14px;height:14px;border-radius:4px;vertical-align:-2px;border:2px solid}.key-prior{background:var(--prior);border-color:var(--prior-line)}.key-build{background:var(--build);border-color:var(--build-line)}.key-target{background:var(--target);border-color:var(--target-line)}.key-off{background:#f3efe6;border-color:#d6cdbb}.list-h{font-size:1rem;margin:8px 0 4px}.path-list{margin:0;padding-left:1.4em}.path-item.is-target .path-label{font-weight:800}.path-status{color:var(--ink-soft);font-size:.9rem}.plan-grid{display:grid;grid-template-columns:minmax(0,10em) minmax(0,1fr);gap:6px 14px;margin:0 0 14px}.plan-grid dt{font-weight:700}.plan-grid dd{margin:0}.ask{font-size:1.05rem;font-weight:600;color:var(--accent-ink)}.knobs{display:flex;flex-wrap:wrap;gap:4px 24px;border-top:1px solid var(--line);padding-top:12px}.approved-row{display:flex;flex-wrap:wrap;align-items:center;gap:12px}.approved{margin:0;font-weight:700;color:var(--go)}.experiment{display:grid;gap:12px}.progress-line{margin:0;font-weight:700;color:var(--ink-soft)}.canvas-wrap{width:100%}.stage{display:block;width:100%;height:auto;background:#fbf8f1;border:1px solid var(--line);border-radius:12px}.stage-svg{max-height:260px}.legend{display:flex;flex-wrap:wrap;gap:4px 14px;list-style:none;padding:0;margin:0;font-size:.9rem}.swatch{display:inline-block;width:14px;height:14px;border-radius:3px;margin-right:6px;vertical-align:-2px;border:1px solid rgba(0,0,0,.25)}.swatch-smooth{background:#9fd3ef}.swatch-wood{background:#c08a4e}.swatch-carpet{background:#c0504d}.swatch-sand{background:#e2c98f}.controls{display:grid;gap:8px}.range{display:grid;gap:4px;font-weight:600}.range input{width:100%;min-height:44px;accent-color:var(--go)}.hint{margin:0;background:#eef4fb;border-left:4px solid var(--focus);padding:8px 10px;border-radius:6px}.now-testing{margin:0}.running{margin:0;font-weight:700}.result:empty{display:none}.result-card{border-radius:12px;padding:12px 14px}.result-card.is-right{background:var(--right)}.result-card.is-miss{background:var(--miss)}.result-pred{margin:0;font-size:.9rem;color:var(--ink-soft)}.result-head{margin:.2em 0;font-size:1.15rem;font-weight:800}.result-why{margin:0;padding-left:1.2em}.times{border-collapse:collapse;width:100%;max-width:420px}.times caption{text-align:left;font-weight:700;padding-bottom:4px}.times th,.times td{text-align:left;padding:6px 8px;border-bottom:1px solid var(--line)}.times tr.is-winner{background:var(--build)}.summary{border:2px solid var(--go);border-radius:12px;padding:12px 14px}.summary-score{margin-top:0;font-size:1.1rem}.magnet-body{fill:#c0504d}.magnet-n,.magnet-s{fill:#e8e1d2}.barrier{fill:#c9b48f}.item{transition:transform .6s ease-in}.item.slide-to-magnet{transform:translate(-120px)}.item.slide-to-barrier{transform:translate(-100px)}.item-body{fill:#b9c2cc;stroke:var(--ink);stroke-width:2}.item-label{font-size:12px;fill:var(--ink)}.floor{stroke:#8a8170;stroke-width:2}.wall{fill:#e8e1d2;stroke:#8a8170}.shadow{fill:#3b3b46}.ray{stroke:#e9b44c;stroke-width:1.5;stroke-dasharray:4 3}.torch{fill:var(--ink)}.toy{fill:var(--accent)}.foot{margin-top:24px;font-size:.88rem;color:var(--ink-soft)}@media(max-width:520px){.app,.panel{padding:12px}.plan-grid{grid-template-columns:minmax(0,1fr)}.plan-grid dd{margin-bottom:6px}}@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important;scroll-behavior:auto!important}}