:root{--bg: #0b1020;--panel: #141b2e;--ink: #e9edf7;--muted: #93a1c0;--board-edge: rgba(129, 140, 248, .2);--cellbg: #1a2237;--accent: #a5b4fc;--wall: rgba(199, 210, 254, .92);--good: #4ade80;--bad: #f87171;--hintc: #22d3ee;--cell: 46px}*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:radial-gradient(1100px 640px at 50% -8%,#1e1b4b 0%,var(--bg) 60%);color:var(--ink);font:15px/1.5 ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif}main{max-width:720px;margin:0 auto;padding:32px 20px 48px;text-align:center}h1{margin:0;font-size:34px;letter-spacing:.5px}h1 span{color:var(--accent);text-shadow:0 0 18px rgba(165,180,252,.45)}.sub{margin:6px auto 20px;max-width:610px;color:var(--muted)}.sub strong,.note strong{color:var(--ink)}#wrap{display:flex;justify-content:center}#board{display:grid;padding:16px;background:var(--panel);border:1px solid var(--board-edge);border-radius:14px;position:relative;gap:0}.badge{position:absolute;top:-9px;right:14px;font-size:11px;letter-spacing:.6px;text-transform:uppercase;color:var(--muted);background:var(--bg);padding:0 8px;border-radius:6px}.cell{width:var(--cell);height:var(--cell);border:1px solid rgba(147,161,192,.14);border-radius:0;background:var(--cellbg);cursor:pointer;padding:0;position:relative;color:var(--ink);font:600 17px/1 ui-monospace,SFMono-Regular,Menlo,monospace;transition:background .12s,box-shadow .12s}.cell:hover{z-index:3;box-shadow:inset 0 0 0 2px #a5b4fc80}.cell.v1{background:#1f2a44;color:#c7d2fe}.cell.v2{background:#1c3050;color:#93c5fd}.cell.v3{background:#16374b;color:#67e8f9}.cell.v4{background:#223046;color:#fca5a5}.cell.v5{background:#2b2a4a;color:#d8b4fe}.cell.v6,.cell.v7,.cell.v8,.cell.v9{background:#2f2a3c;color:#fbbf24}.cell.clue{font-weight:800;box-shadow:inset 0 0 0 1px #c7d2fe59}.cell.clue:after{content:"";position:absolute;left:4px;top:4px;width:4px;height:4px;border-radius:50%;background:#c7d2fe99}.cell.wall-t{border-top:2px solid var(--wall)}.cell.wall-b{border-bottom:2px solid var(--wall)}.cell.wall-l{border-left:2px solid var(--wall)}.cell.wall-r{border-right:2px solid var(--wall)}.cell.edge-t{border-top:2px solid var(--wall)}.cell.edge-b{border-bottom:2px solid var(--wall)}.cell.edge-l{border-left:2px solid var(--wall)}.cell.edge-r{border-right:2px solid var(--wall)}.cell.done:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:#4ade8012;pointer-events:none}.cell.conflict{box-shadow:inset 0 0 0 2px #f87171d9;color:var(--bad);z-index:2}.cell.hinted{box-shadow:inset 0 0 0 3px var(--hintc);z-index:4}.cell.cursor{outline:2px dashed rgba(165,180,252,.7);outline-offset:-4px;z-index:5}#board.won .cell{cursor:default}#board.won .cell.done:before{background:#4ade8021}.hud{min-height:62px;margin:14px 0 4px}#status{color:var(--muted)}#status.good{color:var(--good)}#status.bad{color:var(--bad)}#status.hint{color:var(--hintc)}.controls{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;align-items:center;margin-top:10px}.controls label{color:var(--muted);font-size:14px;display:flex;gap:6px;align-items:center}select,button{background:var(--panel);color:var(--ink);border:1px solid rgba(147,161,192,.35);border-radius:9px;padding:8px 16px;font-size:14px;cursor:pointer;transition:border-color .12s,box-shadow .12s}select:hover,button:hover{border-color:var(--accent);box-shadow:0 0 10px #a5b4fc40}.note{margin:34px auto 0;max-width:640px;text-align:left;color:var(--muted);font-size:14px;border-top:1px solid rgba(147,161,192,.18);padding-top:18px}.note table{border-collapse:collapse;margin:12px 0;font-size:13px}.note th,.note td{border:1px solid rgba(147,161,192,.2);padding:4px 10px;text-align:right}.note th:first-child,.note td:first-child{text-align:left}.note code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12.5px;color:var(--accent)}@media (max-width: 560px){:root{--cell: 32px}}