:root{color-scheme:dark;--bg:#111c20;--panel:#19292d;--line:#365052;--ink:#e8e5d8;--muted:#abbcb8;--mint:#b7e3bc;--tile:#25383b}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.65 system-ui,-apple-system,"Segoe UI",sans-serif}header{max-width:1160px;margin:auto;padding:26px 32px;display:flex;justify-content:space-between;align-items:center;gap:16px;border-bottom:1px solid var(--line);flex-wrap:wrap}header a{color:var(--ink);text-decoration:none;font-weight:750;letter-spacing:.12em}header a:not(:first-child){font-size:12px;font-weight:600;color:var(--mint);border:1px solid var(--line);border-radius:20px;padding:6px 14px;letter-spacing:.04em}header a span,.badge{font:11px/1.6 monospace;color:var(--muted)}main{max-width:1160px;margin:auto;padding:38px 32px}.intro{margin-bottom:32px;display:grid;grid-template-columns:1fr 1fr;column-gap:40px}.intro .eyebrow{grid-column:1/-1}.eyebrow{font:11px/1.8 monospace;letter-spacing:.16em;color:var(--mint);margin:0 0 12px}h1{font-family:serif;font-size:clamp(36px,6vw,64px);line-height:1.2;font-weight:500;margin:0}h2{font-size:21px;line-height:1.5;margin:0 0 18px}h2 span{display:block;font-size:12px;font-weight:400;color:var(--muted)}.intro>p:last-child{align-self:end;color:var(--muted)}.layout{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(290px,1fr);gap:26px;align-items:start}.game,.panel{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:24px}.game-heading{display:flex;justify-content:space-between;gap:8px;align-items:center}#progress{font:13px monospace;color:var(--mint)}
#board{display:grid;grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(9,1fr);gap:1px;width:100%;max-width:490px;aspect-ratio:1;margin:12px auto 16px;background:var(--tile);border-radius:8px;padding:8px;border:2px solid var(--line)}
#board .cell{display:flex;align-items:center;justify-content:center;background:var(--bg);cursor:pointer;font:600 clamp(16px,3.4vw,22px)/1 system-ui,sans-serif;color:var(--ink);user-select:none}
#board .cell.given{color:var(--mint);cursor:default;background:#1c2d30}
#board .cell.selected{outline:2px solid var(--mint);outline-offset:-2px}
#board .cell.hinted{outline:2px solid #efd79b;outline-offset:-2px}
#board .cell.conflict{background:#3a2323;color:#f0a3a3}
#board .cell.box-left{border-left:2px solid var(--line)}
#board .cell.box-top{border-top:2px solid var(--line)}
#board .cell.box-right{border-right:2px solid var(--line)}
#board .cell.box-bottom{border-bottom:2px solid var(--line)}
#keypad{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;max-width:490px;margin:0 auto 16px}
#keypad button{min-height:48px;font-size:16px;font-weight:650}
#keypad button:last-child{grid-column:span 1;font-size:12px}
button,select,input{font:inherit;border:1px solid #526e6c;border-radius:9px;background:transparent;color:var(--ink);padding:10px 13px;min-height:44px}button{cursor:pointer}button:disabled{opacity:.45;cursor:not-allowed}button:focus-visible,select:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #efd79b;outline-offset:3px}select option{background:var(--panel)}label{display:block;font-size:12px;color:var(--muted);margin:15px 0 7px}select,input{width:100%;min-width:0}aside{display:grid;gap:20px}.primary{width:100%;background:var(--mint);color:#142521;border:0;font-weight:650;margin:16px 0}.actions{display:flex;gap:8px;flex-wrap:wrap}.actions button{flex:1;font-size:12px;white-space:nowrap}.help,.record{color:var(--muted);font-size:12px}.record{margin-bottom:0}#status{min-height:26px;color:var(--mint)}details{border-top:1px solid var(--line);padding-top:13px;margin-top:12px;font-size:12px;color:var(--muted)}summary{cursor:pointer;min-height:32px}details button{margin-top:10px}#verification{font-size:13px}footer{font-size:12px;color:var(--muted);padding:28px 0}
@media(max-width:740px){header{padding:20px}main{padding:24px 16px}.intro{display:block}.intro>p:last-child{margin-top:16px}.layout{grid-template-columns:minmax(0,1fr)}.game,.panel{padding:18px}.badge{display:none}}