:root{--bg: #f6f1e7;--panel: #fffdf8;--ink: #1f1a14;--muted: #625849;--line: #ddd2bf;--accent: #1d4e89;--accent-ink: #ffffff;--gold: #b7791f;--bad: #b42318;--good: #1f7a3d;--sq: #ecdcb9;--sq-line: #b99c6b;--citadel: #d7b98a;--sel: rgba(29, 78, 137, .32);--last: rgba(183, 121, 31, .32);--move: #1d4e89;--cap: #b42318;--w-fill: #fffaf0;--w-ink: #2a2118;--w-edge: #6b5a42;--b-fill: #2c2a35;--b-ink: #f3e9d6;--b-edge: #0f0e13;--mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;color-scheme:light}@media(prefers-color-scheme:dark){:root{--bg: #15171c;--panel: #1d2027;--ink: #ece6da;--muted: #a59b8a;--line: #343844;--accent: #7fb0ea;--accent-ink: #0f1a2a;--gold: #e0a64a;--bad: #f2877d;--good: #6fcf8f;--sq: #6b5a40;--sq-line: #3b3020;--citadel: #8a6a3e;--sel: rgba(127, 176, 234, .4);--last: rgba(224, 166, 74, .38);--move: #b8d6fb;--cap: 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var(--sq-line);padding:0;margin:0;border-radius:0;color:inherit;display:grid;place-items:center;min-width:0;min-height:0;overflow:hidden;font-size:inherit}button.cell{cursor:pointer}button.cell:hover{filter:brightness(1.05)}.cell.void{background:transparent;border:0}.cell.citadel{background:repeating-linear-gradient(45deg,var(--citadel),var(--citadel) 4px,var(--sq) 4px,var(--sq) 8px);border:2px solid var(--gold);border-radius:6px}.cit-mark{line-height:0;font-size:1.1em;color:var(--gold);opacity:.8}.cell.last{background-image:linear-gradient(var(--last),var(--last))}.cell.selected{background-image:linear-gradient(var(--sel),var(--sel))}.board>.cell.check{box-shadow:inset 0 0 0 3px var(--cap),inset 0 0 14px var(--cap)}.coord{position:absolute;font-size:.6rem;color:var(--muted);line-height:1;pointer-events:none}.coord.rank{left:2px;top:2px}.coord.file{right:2px;bottom:2px}.board 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