:root{color-scheme:dark;--bg:#090d17;--panel:#101827;--ink:#eff3ff;--dim:#a5b3cd;--blue:#97b0ff;--line:#293750;--mint:#70e6b6}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Arial,Helvetica,sans-serif;font-size:16px;line-height:1.5}button,a{-webkit-tap-highlight-color:transparent}a{color:var(--blue)}button{font:inherit;cursor:pointer}button:disabled{cursor:default;opacity:.45}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid var(--blue);outline-offset:5px}button,a,summary{touch-action:manipulation}[hidden]{display:none!important}header{max-width:1180px;margin:auto;padding:24px 30px;display:flex;align-items:center;gap:24px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-size:21px;font-weight:800;text-decoration:none}.brand svg{color:var(--blue)}.edition{font:11px Consolas,monospace;letter-spacing:1px;color:var(--dim)}.header-link{margin-left:auto;font-size:12px;text-decoration:none}main{max-width:980px;margin:auto;padding:48px 30px 60px}.intro{max-width:790px;margin-bottom:28px}.eyebrow{font:11px Consolas,monospace;letter-spacing:1.6px;color:var(--blue);margin:0 0 15px}h1{font-size:clamp(39px,6.3vw,68px);letter-spacing:-2.8px;line-height:1.02;margin:0 0 22px;font-weight:900}h1 em{font-style:normal;color:var(--blue)}.lede{font-size:17px;color:var(--dim);max-width:650px;margin:0}.lede strong{color:var(--ink);font-weight:600}.arena{border:1px solid #354565;background:var(--panel);border-radius:16px;overflow:hidden;scroll-margin-top:18px}.arena-top{display:flex;justify-content:space-between;gap:16px;align-items:center;padding:15px 24px;border-bottom:1px solid var(--line);font:12px Consolas,monospace;color:var(--dim)}.simulation{font-size:10px;letter-spacing:1.2px}.fixed{color:var(--mint)}.world{background:linear-gradient(130deg,#111d32,#0b1120);border-bottom:1px solid var(--line)}#world{display:block;width:100%;max-height:330px}.track{fill:none;stroke:#7188b16b;stroke-width:3;stroke-dasharray:5 9}.platform path:first-child{fill:#6f8bd9;stroke:#b2c5ff;stroke-width:1.5}.platform path:nth-child(2){fill:#354b86;stroke:#7b98e5;stroke-width:1.3}.platform text{text-anchor:middle;fill:#edf3ff;font:bold 18px Arial}.platform.start path:first-child{fill:#374661}.platform.start path:nth-child(2){fill:#202d46}.platform.start text{font:10px Consolas,monospace;fill:#9cadcc}#runner{transform:translate(70px,240px);transition:transform .36s cubic-bezier(.2,.75,.2,1)}[data-position="1"] #runner{transform:translate(210px,178px)}[data-position="2"] #runner{transform:translate(360px,230px)}[data-position="3"] #runner{transform:translate(510px,142px)}[data-position="4"] #runner{transform:translate(660px,195px)}.world-caption{display:flex;justify-content:space-between;gap:12px;padding:7px 25px 15px;color:var(--dim);font-size:13px}.world-caption b{font-size:20px;padding-left:8px;color:var(--ink)}.controls{padding:20px 24px 0}.control-label{display:flex;justify-content:space-between;gap:12px;font-size:12px;color:var(--dim);margin:0 0 12px}.touches{display:grid;grid-template-columns:repeat(4,1fr) 1.9fr;gap:8px}.touches button{border:1px solid #394e74;border-radius:9px;background:#192640;color:var(--dim);padding:11px 8px;font-size:11px;transition:background .15s,transform .15s}.touches button:hover:not(:disabled){background:#253b60;transform:translateY(-2px)}.touches button>span:first-child{display:block;color:var(--ink);font-size:24px;font-weight:800;line-height:1.2;margin-bottom:3px}#reset-player{font-size:27px;line-height:1.2;color:var(--blue);background:#202d4a}#reset-player span{font-size:12px;color:var(--ink);display:block}#route{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;list-style:none;padding:0;margin:17px 0 12px;counter-reset:move}#route li{padding:11px 10px;border-bottom:2px solid #2d3b56;font:12px Consolas,monospace;color:#8f9eb9}#route li::before{counter-increment:move;content:counter(move) ' · ';color:#61718e}#route li.filled{color:var(--ink);border-color:var(--blue)}.small-controls{display:flex;gap:17px;flex-wrap:wrap}.small-controls button{padding:7px 0;border:0;background:none;color:var(--dim);font-size:12px;text-decoration:underline;text-underline-offset:4px}#status{font-size:13px;color:var(--ink);min-height:40px;margin:14px 0 18px}#hint-text{padding:12px 15px;border-left:2px solid var(--blue);font-size:13px;color:var(--dim);margin:0 0 20px}#outcome{padding:26px 24px;border-top:1px solid #704548;background:linear-gradient(160deg,#221b2c,#111b2b)}#outcome-title{font-size:40px;line-height:1.05;letter-spacing:-1.4px;color:#ff8e89;margin:0 0 15px}#outcome-message{max-width:620px;color:#d2dbee;font-size:15px;margin:0 0 20px}.primary{display:inline-block;padding:14px 20px;border:0;border-radius:9px;background:var(--blue);color:#0a1222;text-decoration:none;font-size:14px;font-weight:800}#guard-result{margin-top:23px}.kept{font-weight:800;font-size:22px;line-height:1.3;color:var(--mint)}pre{padding:17px 20px;background:#0a1120;border:1px solid var(--line);border-radius:8px;overflow-x:auto}code{font:12px/1.8 Consolas,'Courier New',monospace;color:#c1d1ff}.fine{font-size:12px;line-height:1.65;color:var(--dim)}.share{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}.share button{padding:11px 16px;border:1px solid #50648a;border-radius:8px;background:#172238;color:var(--ink);font-size:12px}#share-notice{font-size:12px;color:var(--mint);overflow-wrap:anywhere;min-height:18px;margin-bottom:0}.next-step{border-top:1px solid var(--line);padding-top:26px;margin-top:26px}.next-step h3{font-size:33px;letter-spacing:-1px;line-height:1.1;margin:0 0 15px}.next-step>p:not(.eyebrow){max-width:590px;color:var(--dim);font-size:14px}.evidence{margin-top:25px}details{border:1px solid var(--line);border-radius:12px;padding:18px 22px}summary{cursor:pointer;font-size:13px;color:var(--dim)}summary span{color:var(--blue)}details>p{color:var(--dim);font-size:14px;line-height:1.7}video{display:block;width:100%;max-height:540px;background:#05070d;border-radius:8px}footer{display:flex;justify-content:space-between;gap:15px;max-width:1180px;margin:auto;padding:22px 30px;border-top:1px solid var(--line);font-size:11px;color:#8898b5}@media(max-width:600px){header{padding:18px;gap:12px}.brand{font-size:18px}.edition{font-size:9px;letter-spacing:.3px}.header-link{display:none}main{padding:32px 16px 40px}h1{letter-spacing:-1.7px}.lede{font-size:15px}.arena-top{padding:13px 16px;font-size:10px;gap:10px}.simulation{font-size:8px;letter-spacing:.5px}.controls{padding:17px 15px 0}.touches{grid-template-columns:repeat(4,1fr)}#reset-player{grid-column:1/-1;display:flex;justify-content:center;align-items:center;gap:12px;padding:12px}.touches button{min-height:64px}#reset-player span{font-size:13px}#route li{font-size:10px;padding:10px 3px}.world-caption{padding:7px 16px 12px;font-size:10px}.world-caption b{font-size:16px}#outcome{padding:24px 16px}#outcome-title{font-size:34px}.primary{width:100%;text-align:center;font-size:13px}details{padding:15px}summary{font-size:12px}footer{padding:20px 18px;flex-direction:column;gap:7px}.next-step h3{font-size:30px}}@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

.solved #outcome-title{color:var(--mint)}.solved #outcome{border-top-color:#386b60}

@media(min-width:1000px){main{max-width:1180px;display:grid;grid-template-columns:minmax(270px,.77fr) minmax(0,1.5fr);gap:26px;padding-top:34px;align-items:start}.intro{padding-top:17px;max-width:350px}.intro h1{font-size:52px;letter-spacing:-2px}.intro .lede{font-size:15px}.evidence{grid-column:2;margin-top:0}.controls{padding-top:16px}}