*{box-sizing:border-box}:root{font:16px/1.5 Inter,ui-sans-serif,system-ui,-apple-system,sans-serif;font-synthesis:none;color:var(--ink);background:var(--page)}body{margin:0}button,select{font:inherit}button{cursor:pointer}button:disabled{opacity:.45;cursor:default}a{color:inherit;text-underline-offset:4px}button:focus-visible,a:focus-visible,select:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--focus);outline-offset:3px}[hidden]{display:none!important}.skip{position:absolute;left:12px;top:-90px;padding:12px;background:#fff;z-index:10}.skip:focus{top:12px}header,main,footer{width:min(1100px,calc(100% - 48px));margin:auto}header{height:88px;display:flex;justify-content:space-between;align-items:center;gap:15px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:9px;font-size:24px;font-weight:750;letter-spacing:-.9px;text-decoration:none}.brand svg{width:34px;height:34px}header>a:last-child{font-size:12px;text-decoration:none}.heading{padding:38px 0 27px;display:flex;align-items:end;justify-content:space-between;gap:22px}.eyebrow{font-size:10px;letter-spacing:2.2px;font-weight:750;color:var(--muted);margin:0 0 11px}h1{font-size:clamp(27px,3.4vw,40px);letter-spacing:-1.2px;line-height:1.12;margin:0}.picker{display:grid;gap:8px;font-size:11px;font-weight:750;color:var(--muted);min-width:180px}select{border:1px solid var(--line);border-radius:9px;background:var(--paper);color:var(--ink);padding:11px;max-width:100%;min-width:0}.play-layout{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:22px;align-items:start}.stage{min-width:0;border:1px solid var(--line);border-radius:23px;background:var(--panel);padding:22px;box-shadow:0 15px 30px #35495a10}.stage-top{display:flex;justify-content:space-between;gap:15px;font-size:10px;letter-spacing:1px;font-weight:750;color:var(--muted);margin-bottom:18px}.rail{border:1px solid var(--line);border-radius:23px;padding:25px;background:var(--paper)}.rail h2{font-size:17px;line-height:1.4;margin:0 0 10px}.score strong{font-size:64px;font-weight:550;letter-spacing:-3px;line-height:1.1;display:block}.score>span{font-size:10px;font-weight:700;letter-spacing:1.5px;color:var(--muted)}.stats{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:20px}.stats>div{background:var(--stat);padding:12px 10px;border-radius:9px;display:grid;gap:4px}.stats span{font-size:10px;color:var(--muted)}.stats b{font-size:20px;font-variant-numeric:tabular-nums}.feedback{font-size:13px;line-height:1.7;min-height:50px;border-top:1px solid var(--line);padding-top:17px;margin:23px 0 17px}.primary,.quiet,.actions button,.notice button{min-height:44px;padding:10px 13px;font-size:12px;font-weight:750;border:1px solid var(--line);border-radius:9px;background:var(--paper);color:var(--ink)}.primary{background:var(--accent);color:var(--accent-text);border-color:var(--accent)}.rail>.primary,.rail>.quiet{width:100%;margin-bottom:9px}.actions{display:grid;grid-template-columns:1fr 1fr;gap:8px}.key-note{text-align:center;color:var(--muted);font-size:10px;line-height:1.8;margin:17px 0 0}.result{background:var(--stat);padding:16px;border-radius:11px;margin-top:17px}.result h2{font-size:17px;line-height:1.4;margin:0 0 8px}.result p{font-size:12px;line-height:1.7;color:var(--muted);margin:0}.next{width:100%;margin-top:14px}.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:25px;border-top:1px solid var(--line);margin:31px 0 25px;padding:21px 0 0;list-style:none}.steps li{display:flex;align-items:center;gap:12px}.steps span{display:grid;place-items:center;border:1px solid var(--line);border-radius:50%;width:29px;height:29px;flex:none;font-size:10px;color:var(--muted)}.steps p{font-size:12px;color:var(--muted);line-height:1.6;margin:0}footer{border-top:1px solid var(--line);padding:22px 0 31px;display:flex;justify-content:space-between;gap:18px;font-size:11px;color:var(--muted)}footer nav{display:flex;gap:19px}.notice{background:#fff2d5;border:1px solid #ba8f53;border-radius:11px;padding:15px;color:#61401e;margin-bottom:20px;font-size:13px}.notice p{margin:0 0 12px;line-height:1.6}.notice button{background:#fff9e8;color:inherit}.notice details{margin-top:12px;font-size:11px}.notice pre{white-space:pre-wrap;overflow-wrap:anywhere}dialog{border:1px solid var(--line);border-radius:17px;background:var(--paper);color:var(--ink);padding:25px;width:min(440px,calc(100% - 28px))}dialog::backdrop{background:#263b4799}dialog h2{font-size:20px;margin-top:0}dialog p{font-size:14px;line-height:1.7}.dialog-actions{display:flex;flex-wrap:wrap;justify-content:end;gap:10px}.dialog-actions button{min-height:44px;border:1px solid var(--line);border-radius:9px;padding:10px 13px}.article{max-width:720px;padding:40px 0}.article h1{margin-bottom:30px}.article h2{font-size:20px;margin:29px 0 10px}.article p,.article li{font-size:15px;line-height:1.85;color:var(--muted)}.article .primary{display:inline-block;text-decoration:none;margin-top:22px}@media(max-width:760px){.play-layout{grid-template-columns:1fr}.rail{padding:21px}.heading{padding-top:28px}.feedback{min-height:0;margin:17px 0;padding-top:15px}.stage{padding:20px}.score strong{font-size:49px}.stats{margin-top:15px}.steps{gap:16px}}@media(max-width:480px){header,main,footer{width:calc(100% - 28px)}header{height:68px}.brand{font-size:21px}.brand svg{width:29px;height:29px}.heading{display:grid;gap:18px;padding:25px 0 19px}.picker{grid-template-columns:auto minmax(0,1fr);align-items:center;gap:12px;min-width:0}select{width:100%;font-size:12px}.stage{padding:14px;border-radius:17px}.stage-top{font-size:9px;letter-spacing:.5px;margin-bottom:14px}.rail{padding:17px;border-radius:17px}.steps{grid-template-columns:1fr;gap:12px;margin-top:24px;padding-top:19px}.steps li{gap:10px}.steps span{width:26px;height:26px}footer{font-size:10px}h1{letter-spacing:-.8px}}
:root{--page:#f7f1e6;--paper:#fffbf1;--panel:#eee6d8;--stat:#eee9d8;--ink:#644c3e;--muted:#947f68;--line:#ddd0bc;--accent:#9d6f4e;--accent-text:#fff9e9;--focus:#577f78}#board{display:block;width:100%;height:auto;aspect-ratio:1.2;background:#faf7eb;border:1px solid #e1d6c4;border-radius:12px;touch-action:none;background-image:radial-gradient(#cabc9e50 1px,transparent 1px);background-size:20px 20px}#board [data-piece]{cursor:grab}#board [data-piece]:active{cursor:grabbing}.piece-picker{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:7px;margin-top:17px}.piece-picker button{min-width:0;min-height:55px;position:relative;border:1px solid #d8c9b1;border-radius:8px;background:#fffbef;padding:8px;display:grid;place-items:center}.piece-picker button.selected{background:#eadcc5;box-shadow:inset 0 0 0 2px #a57c59}.piece-picker svg{width:40px;height:40px}.piece-number{position:absolute;left:6px;top:3px;font-size:9px;color:#927a62}.orientation{font-size:11px;color:#957a63;margin:0 0 18px}.move-pad{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:7px}.move-pad button{min-height:46px;border:1px solid #d6c6ae;border-radius:9px;background:#f4eddd;color:#89654d;font-size:23px}.move-pad [data-action=up]{grid-column:2}.move-pad [data-action=left]{grid-column:1}.move-pad [data-action=down]{grid-column:2}.move-pad [data-action=right]{grid-column:3;grid-row:2}.turn-controls{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-top:12px}.turn-controls button{min-height:44px;border:1px solid #d6c6ae;border-radius:8px;background:#fffbf1;color:#86664f;font-size:12px;font-weight:700}.turn-controls [data-action=flip]{grid-column:1/-1}.stats b span{font-size:20px;color:inherit}.brand svg{color:#cc845f}@media(max-width:760px){.piece-picker{grid-template-columns:repeat(7,minmax(0,1fr))}.move-pad{grid-template-columns:repeat(4,minmax(0,1fr))}.move-pad [data-action]{grid-column:auto;grid-row:auto}.turn-controls{grid-template-columns:repeat(3,minmax(0,1fr))}.turn-controls [data-action=flip]{grid-column:auto}}@media(max-width:480px){.piece-picker{grid-template-columns:repeat(4,minmax(0,1fr));gap:7px;margin-top:13px}.piece-picker button{min-height:54px}.piece-picker svg{width:36px;height:36px}.turn-controls button{font-size:11px}.move-pad{gap:6px}.stats{margin-top:15px}}