:root{--bg: #0f1519;--panel: #17202a;--line: #2c3a47;--ink: #e8f0f4;--dim: #93a6b3;--accent: #7aa2f7;--plus: #f7768e;--minus: #7aa2f7;--accent2: #e0af68;--good: #7dd3a0;--bad: #f87171;--given-bg: #24333f}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:ui-sans-serif,system-ui,-apple-system,Helvetica Neue,sans-serif;line-height:1.65}main{max-width:860px;margin:0 auto;padding:2.2rem 1.2rem 4rem}header h1{font-size:2.1rem;margin:0 0 .5rem;letter-spacing:-.02em}header h1 span{color:var(--accent)}.sub{color:var(--dim);margin:0 0 1.6rem;font-size:.95rem}.sub strong{color:var(--ink)}.legend{display:flex;flex-wrap:wrap;gap:.4rem 1.4rem;color:var(--dim);font-size:.85rem;margin-bottom:1.2rem}.legend i{display:inline-flex;width:20px;height:20px;border-radius:5px;vertical-align:-5px;margin-right:6px;align-items:center;justify-content:center;font-style:normal;font-weight:700;font-size:.86rem}.legend .plus-demo{background:#f7768e29;border:2px solid var(--plus);color:var(--plus)}.legend .minus-demo{background:#7aa2f729;border:2px solid var(--minus);color:var(--minus)}.legend .neut-demo{background:#1c2833;border:2px solid var(--line);color:var(--dim)}.legend .given-demo{background:var(--given-bg);border:2px solid var(--accent2);color:var(--ink)}#wrap{overflow-x:auto;padding-bottom:.4rem}#stage{width:fit-content;margin:0 auto}#board{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:6px;line-height:0}#board.solved{outline:2px solid var(--good)}#board svg{display:block}.cell{fill:#101a22;stroke:#223140;stroke-width:1;cursor:pointer}.cell.sel{stroke:var(--accent2);stroke-width:2}.cell.neut{fill:#1c2833}.cell.plus{fill:#f7768e24}.cell.minus{fill:#7aa2f724}.cell.fixed{fill:var(--given-bg)}.cell.broken{fill:#f8717138}.sym{pointer-events:none;font-weight:700}.sym.plus{fill:var(--plus)}.sym.minus{fill:var(--minus)}.sym.neut{fill:var(--dim)}.sym.wrong{fill:var(--bad)}.dom{fill:none;stroke:#43596d;stroke-width:2.4;pointer-events:none}.frame{fill:none;stroke:#4a5f73;stroke-width:2;pointer-events:none}.clue{fill:var(--dim)}.clue.plus-side{fill:#c96a7e}.clue.minus-side{fill:#6f8fd8}.clue.met{fill:var(--good)}.clue.wrong{fill:var(--bad)}.hud{margin:.9rem 0 .6rem;min-height:1.4rem;color:var(--dim);font-size:.92rem;text-align:center}.controls{display:flex;flex-wrap:wrap;gap:.6rem;justify-content:center;align-items:center;margin-bottom:2rem}.controls label{color:var(--dim);font-size:.88rem;display:inline-flex;gap:.45rem;align-items:center}select,button{background:var(--panel);color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:.45rem .8rem;font-size:.9rem;cursor:pointer}select{max-width:21rem}button:hover,select:hover{border-color:var(--accent)}.notes{border-top:1px solid var(--line);padding-top:1.6rem;font-size:.95rem}.notes h2{font-size:1.15rem;margin:1.8rem 0 .6rem}.notes p{color:var(--dim);margin:.6rem 0}.notes strong,.notes em{color:var(--ink)}.notes code{background:#1c2833;border:1px solid var(--line);border-radius:5px;padding:.05rem .35rem;font-size:.85em;color:var(--accent)}.notes table,#fluxnote table{border-collapse:collapse;margin:.8rem 0;font-size:.86rem;color:var(--dim)}.notes th,.notes td,#fluxnote th,#fluxnote td{border:1px solid var(--line);padding:.3rem .65rem;text-align:left}.notes th,#fluxnote th{color:var(--ink);background:#1c2833}.notes .cap{font-size:.85rem;margin-top:-.2rem}#fluxnote{overflow-x:auto}footer{margin-top:2.4rem;border-top:1px solid var(--line);padding-top:1.2rem;color:var(--dim);font-size:.85rem}