:root{--bg: #0e1116;--panel: #181d25;--line: #2a323d;--ink: #eef3f7;--dim: #93a4b3;--accent: #8a8f9c;--accent2: #b6bcc8;--black: #10151b;--cell: #222c36;--cell2: #2a3744;--fill: #e8edf3;--good: #3fae6b;--bad: #c4485a}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(900px 560px at 50% -8%,#1a2029,var(--bg));color:var(--ink);font-family:system-ui,-apple-system,Segoe UI,sans-serif;display:flex;justify-content:center;-webkit-user-select:none;user-select:none}#app{width:100%;max-width:560px;padding:12px 12px 26px}header{text-align:center;margin-bottom:6px}h1{margin:0;font-size:28px;letter-spacing:6px;font-weight:800;color:var(--accent2)}.sub{margin:3px 0 0;color:var(--dim);font-size:13px}.bar{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;align-items:center;margin:10px 0}.seg{display:inline-flex;background:var(--panel);border:1px solid var(--line);border-radius:999px;overflow:hidden}.seg button{background:none;border:none;color:var(--dim);padding:6px 13px;font:600 13px system-ui;cursor:pointer}.seg button.active{background:var(--accent);color:#0a0d12}.btn{background:var(--panel);border:1px solid var(--line);color:var(--ink);padding:7px 14px;border-radius:999px;font:700 13px system-ui;cursor:pointer}.btn:hover{border-color:var(--accent2)}.btn.primary{background:var(--accent2);color:#0a0d12;border-color:var(--accent2)}.scoreboard{display:flex;gap:10px;justify-content:center;margin:8px 0}.readout{background:#0a0e13;border:1px solid var(--line);border-radius:8px;padding:5px 14px;font:800 18px ui-monospace,monospace;color:var(--accent2);min-width:84px;text-align:center}.readout span{color:var(--dim);font-size:11px;display:block;font-weight:600;letter-spacing:.5px}.stage{position:relative;display:flex;justify-content:center}.grid{display:grid;gap:2px;background:var(--line);border:2px solid var(--line);border-radius:8px;padding:2px;width:min(94vw,460px);aspect-ratio:1}.cell{position:relative;display:flex;align-items:center;justify-content:center;font-weight:700;aspect-ratio:1;background:var(--cell);color:var(--ink);cursor:pointer;border-radius:2px;transition:background .08s}.cell:hover{background:var(--cell2)}.cell.filled{background:var(--fill);color:#0a0d12}.cell.filled:hover{background:#d2d8e0}.cell.marked{background:#161c23}.cell .num{font-size:clamp(11px,4.4vw,22px);line-height:1}.cell .dot{color:var(--dim);font-size:22px;line-height:1}.cell.clue.open{color:var(--ink)}.cell.clue.filled.open{color:#0a0d12}.cell.clue.done{background:#3fae6b38;color:var(--good)}.cell.clue.filled.done{background:#2f8f57;color:#eafff2}.cell.clue.exceeded{background:#c4485a38;color:#ff9aa6}.cell.clue.filled.exceeded{background:#9c3543;color:#ffe1e4}.grid[data-size="15"] .cell .num{font-size:clamp(8px,2.6vw,13px)}.grid[data-size="10"] .cell .num{font-size:clamp(9px,3.4vw,17px)}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#080c10c7;border-radius:8px;backdrop-filter:blur(3px)}.overlay.hidden{display:none}.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:22px 26px;text-align:center;max-width:320px}.card h2{margin:0 0 6px;font-size:24px;color:var(--accent2)}.card p{margin:6px 0;color:var(--dim);font-size:14px}.card .row{display:flex;gap:8px;justify-content:center;margin-top:14px}.hint{text-align:center;color:var(--dim);font-size:12px;margin-top:14px;line-height:1.5}