*{box-sizing:border-box}:root{font:16px/1.5 ui-sans-serif,system-ui,-apple-system,sans-serif;color:var(--ink);background:var(--page);font-synthesis:none}body{margin:0}button,select{font:inherit}a{color:inherit;text-underline-offset:4px}button{cursor:pointer}button:disabled{opacity:.45;cursor:default}[hidden]{display:none!important}button:focus-visible,a:focus-visible,select:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--focus);outline-offset:4px}.skip{position:absolute;left:16px;top:-80px;padding:12px;background:var(--paper);z-index:10}.skip:focus{top:12px}header,main,footer{width:min(1120px,calc(100% - 56px));margin:auto}header{height:88px;display:flex;align-items:center;justify-content:space-between;gap:18px;border-bottom:1px solid var(--line)}header nav{display:flex;gap:24px;font-size:12px}header nav a{text-decoration:none}.brand{display:flex;gap:11px;align-items:center;text-decoration:none;font-size:25px;font-weight:750;letter-spacing:-1px}.brand svg{width:34px;height:34px}.heading{display:flex;align-items:end;justify-content:space-between;gap:25px;padding:35px 0 27px}.eyebrow{font-size:10px;letter-spacing:2px;font-weight:750;color:var(--muted);margin:0 0 10px}h1{font-size:clamp(29px,3.3vw,43px);line-height:1.15;letter-spacing:-1.5px;margin:0}.picker{display:grid;gap:8px;font-size:11px;font-weight:650;color:var(--muted);min-width:155px}select{border:1px solid var(--line);color:var(--ink);background:var(--paper);min-height:44px;border-radius:9px;padding:9px 12px;max-width:100%;min-width:0;font-size:12px}.play-layout{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:24px;align-items:start}.stage{min-width:0;background:var(--panel);border:1px solid var(--line);border-radius:22px;padding:22px;overflow:hidden}.stage-top{display:flex;justify-content:space-between;gap:15px;color:var(--muted);font-size:10px;letter-spacing:1.2px;font-weight:650;margin:0 0 19px}.rail{border:1px solid var(--line);border-radius:22px;padding:24px;background:var(--paper)}.score-label{font-size:10px;letter-spacing:1.5px;color:var(--muted);font-weight:700}.score strong{display:block;font-size:70px;line-height:1.15;font-weight:500;letter-spacing:-3px;color:var(--accent);font-variant-numeric:tabular-nums}.score small{font-size:14px;color:var(--muted)}.stats{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:20px}.stats>div{display:grid;gap:5px;border-radius:10px;background:var(--stat);padding:12px 10px}.stats span{color:var(--muted);font-size:10px}.stats b{font-size:16px;font-weight:650;font-variant-numeric:tabular-nums}.feedback{font-size:13px;line-height:1.65;border-top:1px solid var(--line);margin:22px 0 18px;padding-top:19px;min-height:63px}.primary,.secondary,.actions button,.notice button{border:1px solid var(--line);min-height:44px;padding:11px 12px;border-radius:9px;background:var(--paper);color:var(--ink);font-size:12px;font-weight:700}.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-text)}.rail>.primary{width:100%;margin-bottom:9px}.actions{display:grid;grid-template-columns:1fr 1fr;gap:9px}.keys{font-size:10px;line-height:1.8;text-align:center;color:var(--muted);margin:16px 0 0}.result{padding:17px;border-radius:12px;background:var(--stat);margin-top:18px}.result h2{font-size:17px;margin:0 0 8px;line-height:1.4}.result p{font-size:12px;color:var(--muted);margin:0;line-height:1.7}.result .primary{width:100%;margin-top:16px}.steps{list-style:none;margin:30px 0 0;border-top:1px solid var(--line);padding:22px 0 26px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.steps li{display:flex;gap:12px;align-items:center;font-size:12px;color:var(--muted)}.steps span{width:28px;height:28px;border:1px solid var(--line);border-radius:50%;display:grid;place-items:center;flex:none;font-size:10px}.steps p{margin:0;line-height:1.6}.more{display:flex;align-items:center;flex-wrap:wrap;gap:12px 24px;margin-bottom:25px;font-size:12px;color:var(--muted)}.more span{font-size:10px;letter-spacing:1px}footer{display:flex;justify-content:space-between;gap:18px;border-top:1px solid var(--line);padding:24px 0 30px;font-size:11px;color:var(--muted)}footer nav{display:flex;flex-wrap:wrap;gap:20px}.notice{background:#fff0d2;color:#694826;border:1px solid #c79952;border-radius:12px;padding:15px;margin-bottom:22px;font-size:13px}.notice p{margin:0 0 12px}.notice button{background:#fffaee;color:inherit}.notice details{font-size:11px;margin-top:12px}.notice pre{white-space:pre-wrap;overflow-wrap:anywhere}dialog{width:min(440px,calc(100% - 28px));padding:25px;border:1px solid var(--line);border-radius:17px;background:var(--paper);color:var(--ink)}dialog::backdrop{background:#15333b99}dialog h2{font-size:22px;margin:0 0 12px}dialog p{font-size:14px;line-height:1.7}.dialog-actions{display:flex;justify-content:end;flex-wrap:wrap;gap:10px}.dialog-actions button{min-height:44px;border:1px solid var(--line);border-radius:9px;padding:10px 15px}.article{max-width:740px;padding:43px 0 60px}.article h1{margin-bottom:30px}.article h2{font-size:21px;margin:30px 0 10px;line-height:1.4}.article p,.article li{font-size:15px;line-height:1.85;color:var(--muted)}.article .primary{display:inline-block;text-decoration:none;margin:18px 0 0}.article .faq{border-top:1px solid var(--line);padding-top:10px;margin-top:30px}@media(max-width:800px){.play-layout{grid-template-columns:1fr}.rail{display:grid;grid-template-columns:1fr 1fr;gap:0 22px}.rail>.feedback,.rail>.keys,.rail>.result{grid-column:1/-1}.score strong{font-size:54px}.stats{margin:0;align-self:center}.feedback{min-height:0;margin:18px 0;padding-top:16px}.heading{padding-top:28px}}@media(max-width:480px){header,main,footer{width:calc(100% - 28px)}header{height:70px}.brand{font-size:22px}.brand svg{width:30px;height:30px}header nav{gap:14px;font-size:11px}header nav .hall{display:none}.heading{padding:26px 0 20px;display:grid;gap:17px}.picker{display:grid;grid-template-columns:auto minmax(0,1fr);align-items:center;min-width:0}.stage{padding:14px;border-radius:16px}.stage-top{font-size:9px;margin-bottom:15px;letter-spacing:.6px}.rail{padding:18px;border-radius:16px;gap:0 13px}.score strong{font-size:47px;letter-spacing:-2px}.stats b{font-size:13px}.stats>div{padding:10px 8px}.stats{gap:6px}.rail>.actions{grid-column:1/-1}.rail>.primary{grid-column:1/-1}.steps{grid-template-columns:1fr;gap:12px;padding-top:19px;margin-top:24px}.steps li{font-size:12px}.more{gap:11px 16px;font-size:11px}.more span{width:100%}footer{font-size:10px}footer nav{gap:14px}h1{letter-spacing:-.8px}.article{padding-top:32px}.article h1{font-size:32px}}@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
:root{--page:#f6f3eb;--paper:#fcfaf3;--panel:#e9eddf;--stat:#edf0e3;--ink:#30483e;--muted:#5e705f;--line:#d3dccb;--accent:#537c68;--accent-text:#fffcef;--focus:#b37439}.board-shell{padding:19px;border:1px solid #ccd6c2;background:#f5f4e9;border-radius:17px;max-width:555px;margin:auto}.board{display:grid;grid-template-columns:repeat(var(--size),minmax(0,1fr));gap:10px;width:100%;aspect-ratio:1}.cell{position:relative;display:grid;place-items:center;background:radial-gradient(circle,#b7c7ae 1.6px,transparent 1.8px) center/100% 100%;min-width:0}.arrow{width:100%;height:100%;display:grid;place-items:center;border:1px solid #27413214;border-radius:14px;box-shadow:0 3px 0 #3753401c;background:#d5dec6;color:#426249;transition:background .15s,transform .2s,opacity .2s;position:relative;z-index:1;padding:8px}.arrow svg{width:100%;height:100%;max-width:58px;fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:3.8}.arrow.tone-1{background:#d7e0dd;color:#547477}.arrow.tone-2{background:#eadbbf;color:#90784e}.arrow.tone-3{background:#e8d0c0;color:#a17457}.arrow:hover:not(:disabled){background:#ffffff;transform:translateY(-2px)}.arrow:disabled{opacity:1}.arrow.cleared{visibility:hidden}.arrow.departing{transform:translate(var(--fly-x),var(--fly-y))!important;opacity:0;pointer-events:none;z-index:5}.arrow.hinted{outline:3px solid #40614c;outline-offset:3px}.arrow.blocked{animation:blocked .22s}.progress-track{height:5px;border-radius:5px;background:#d8e1cf;margin:23px auto 0;max-width:555px;overflow:hidden}.progress-track span{display:block;height:100%;background:#729778;transition:width .2s}.level-marker{color:#426249}.level-marker b{font-weight:700;font-variant-numeric:tabular-nums}@keyframes blocked{25%{transform:translateX(-3px)}75%{transform:translateX(3px)}}@media(max-width:480px){.board-shell{padding:12px;border-radius:12px}.board{gap:6px}.arrow{border-radius:9px;padding:3px;box-shadow:0 2px 0 #3753401c}.progress-track{margin-top:16px}}
@media(max-width:480px){.board-shell.dense{padding:0;border:0;background:transparent}.board-shell.dense .board{gap:2px}.board-shell.dense .arrow{border-radius:7px;padding:3px}.stage:has(.board-shell.dense){padding:12px}}