:root{--bg:#fbfaf7;--surface:#fff;--text:#1c1b19;--muted:#6b6862;--border:#d9d5cc;--grid:#ece8e0;--dot:#1f5f8b;--out:#f0ede6;--accent:#b8531f;--crosshair:#b8531f29;--window:#f4dccb;--match:#2f7d32;--mismatch:#b3261e;--gap-open:#92610a;--gap-extend:#6a4bab;--cell:18px}@media (prefers-color-scheme:dark){:root{--bg:#16181a;--surface:#1e2124;--text:#e8e6e1;--muted:#9a968e;--border:#383c40;--grid:#2a2e31;--dot:#6fb2d9;--out:#24282b;--accent:#e8894f;--crosshair:#e8894f33;--window:#4a3728;--match:#7cc47f;--mismatch:#f0938b;--gap-open:#dfa74e;--gap-extend:#b6a2e8}}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font:16px/1.55 ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif}.page{max-width:62rem;margin:0 auto;padding-block:2.5rem 4rem;padding-inline:1rem}.visually-hidden{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.tabs{border-bottom:1px solid var(--border);gap:.2rem;margin-bottom:1.8rem;display:flex}.tabs 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