:root{color-scheme:light;--bg: #f2f0ea;--panel: #ffffff;--panel-border: #ddd8cc;--text: #2b2b33;--text-dim: #8a8794;--accent: #2f6fed;--accent-text: #ffffff;--danger: #d64545;--shadow: 0 8px 30px rgba(30, 30, 50, .14);--board-bg: #f7f5ef;--cell-bg: #fffdf7;--cell-border: #ddd7c8;--cell-dim: #efece3;--arrow: #6b6659;--arrow-strong: #2b2b33;--arrow-dim: #cdc8bb;--number: #33323b;--number-clue: #1a4fc4;--number-clue-bg: rgba(47, 111, 237, .13);--endcap: #1fa85c;--link: #7a7568;--select: #2f6fed;--select-bg: rgba(47, 111, 237, .16);--target: #1fa85c;--target-bg: rgba(31, 168, 92, .16);--error: #d64545;--error-bg: rgba(214, 69, 69, .16);--hint: #e79b17;--hint-bg: rgba(231, 155, 23, .2);--win: #1fa85c;--chain-0: #2563eb;--chain-1: #ea580c;--chain-2: #0d9488;--chain-3: #7c3aed;--chain-4: #e11d48;--chain-5: #16a34a;--chain-6: #b45309;--chain-7: #c026d3;--chain-8: #0891b2;--chain-9: #4d7c0f;--chain-0-bg: rgba(37, 99, 235, .13);--chain-1-bg: rgba(234, 88, 12, .13);--chain-2-bg: rgba(13, 148, 136, .13);--chain-3-bg: rgba(124, 58, 237, .13);--chain-4-bg: rgba(225, 29, 72, .13);--chain-5-bg: rgba(22, 163, 74, .13);--chain-6-bg: rgba(180, 83, 9, .13);--chain-7-bg: rgba(192, 38, 211, .13);--chain-8-bg: rgba(8, 145, 178, .13);--chain-9-bg: rgba(77, 124, 15, .13)}:root[data-theme=dark]{color-scheme:dark;--bg: #14161b;--panel: #1e2129;--panel-border: #31353f;--text: #e5e7ee;--text-dim: #8b8f9c;--accent: #5b9dff;--accent-text: #10131a;--danger: #ef6262;--shadow: 0 8px 30px rgba(0, 0, 0, .45);--board-bg: #191c22;--cell-bg: #222630;--cell-border: #333845;--cell-dim: #1c1f26;--arrow: #9298a8;--arrow-strong: #e5e7ee;--arrow-dim: #3a3f4c;--number: #dfe2ea;--number-clue: #7db3ff;--number-clue-bg: rgba(91, 157, 255, .16);--endcap: #35c777;--link: #7f8595;--select: #5b9dff;--select-bg: rgba(91, 157, 255, .2);--target: #35c777;--target-bg: rgba(53, 199, 119, .18);--error: #ef6262;--error-bg: rgba(239, 98, 98, .2);--hint: #f2b13d;--hint-bg: rgba(242, 177, 61, .22);--win: #35c777;--chain-0: #60a5fa;--chain-1: #fb923c;--chain-2: #2dd4bf;--chain-3: #a78bfa;--chain-4: #fb7185;--chain-5: #4ade80;--chain-6: #fbbf24;--chain-7: #e879f9;--chain-8: #22d3ee;--chain-9: #a3e635;--chain-0-bg: rgba(96, 165, 250, .17);--chain-1-bg: rgba(251, 146, 60, .17);--chain-2-bg: rgba(45, 212, 191, .17);--chain-3-bg: rgba(167, 139, 250, .17);--chain-4-bg: rgba(251, 113, 133, .17);--chain-5-bg: rgba(74, 222, 128, .17);--chain-6-bg: rgba(251, 191, 36, .17);--chain-7-bg: rgba(232, 121, 249, .17);--chain-8-bg: rgba(34, 211, 238, .17);--chain-9-bg: rgba(163, 230, 53, .17)}*{box-sizing:border-box}html,body{margin:0;height:100%;overflow:hidden;font-family:Segoe UI,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);user-select:none;-webkit-user-select:none;overscroll-behavior:none;-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;background:none;border:none;cursor:pointer}.btn{display:inline-flex;align-items:center;gap:6px;padding:7px 14px;border-radius:8px;border:1px solid var(--panel-border);background:var(--panel);transition:background .15s,border-color .15s,opacity .15s}.btn:hover:not(:disabled){border-color:var(--accent)}.btn:disabled{opacity:.45;cursor:default}.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-text);font-weight:600}.btn.primary:hover:not(:disabled){filter:brightness(1.08)}select,input[type=text]{font:inherit;color:var(--text);background:var(--bg);border:1px solid var(--panel-border);border-radius:8px;padding:7px 10px}select:focus,input:focus{outline:2px solid var(--accent);outline-offset:-1px}label.row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:6px 0}input[type=checkbox]{width:18px;height:18px;accent-color:var(--accent)}