:root{--parchment: #f4ecdb;--parchment-2: #ece1c8;--parchment-3: #e3d4b3;--walnut: #8b5e3c;--walnut-deep: #6c4528;--walnut-soft: #b08866;--ink: #1f1714;--ink-soft: #4a3b32;--ink-mute: #8a786a;--felt: #5c8f6f;--felt-deep: #3f6b51;--felt-soft: #d3e2d6;--brass: #c99746;--brass-light: #e7c47e;--brass-deep: #9e7029;--burgundy: #9c3f3f;--cobalt: #2f6fcf;--violet: #6f56b3;--sq-light: #f3e2c1;--sq-dark: #b07946;--role-attacker: var(--cobalt);--role-attacker-fill: #a9c9ff;--role-attacker-fg: #173b78;--role-defender: #4f8264;--role-defender-fill: #9ec5ad;--role-defender-fg: #234734;--role-target: var(--burgundy);--role-target-fill: #df9a9a;--role-target-fg: #581818;--role-support: #7a9c87;--role-support-fill: #c4d8cb;--role-support-fg: #2d4438;--role-blocker: var(--violet);--role-blocker-fill: #c7bdf2;--role-blocker-fg: #33225f;--r-sm: 10px;--r-md: 14px;--r-lg: 22px;--r-xl: 30px;--shadow-1: 0 1px 0 rgba(108, 69, 40, .06), 0 6px 14px -8px rgba(108, 69, 40, .18);--shadow-2: 0 1px 0 rgba(108, 69, 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#8c6730;--burgundy: #c66a6a;--cobalt: #7fb0ff;--violet: #a895e6;--sq-light: #c2a675;--sq-dark: #5b3d24;--role-attacker: var(--cobalt);--role-attacker-fill: #203f73;--role-attacker-fg: #d5e6ff;--role-defender: #7eb38f;--role-defender-fill: #2f4a3a;--role-defender-fg: #cfe5d6;--role-target: var(--burgundy);--role-target-fill: #5b2727;--role-target-fg: #f4c8c8;--role-support: #94b9a3;--role-support-fill: #344739;--role-support-fg: #cddccf;--role-blocker: var(--violet);--role-blocker-fill: #403168;--role-blocker-fg: #e5ddff;--shadow-1: 0 1px 0 rgba(0, 0, 0, .18), 0 6px 14px -8px rgba(0, 0, 0, .5);--shadow-2: 0 1px 0 rgba(0, 0, 0, .22), 0 14px 28px -16px rgba(0, 0, 0, .6);--muted: var(--ink-mute);--soft: var(--parchment);--paper: var(--parchment-2);--line: var(--walnut-soft);--line-strong: var(--walnut);--sage: var(--walnut);--sage-dark: var(--ink-soft);--amber: var(--brass);--amber-soft: var(--brass-light);--charcoal: var(--parchment);--charcoal-2: var(--walnut-deep);--danger: var(--burgundy);--shadow: var(--shadow-2);--surface-soft: var(--parchment-2);--feedback-bg: var(--parchment-2);--success-bg: var(--parchment-3);--success-line: var(--walnut);--rail-item: var(--parchment);--rail-muted: var(--walnut-soft);--rail-sub: var(--walnut-soft);--rail-heading: var(--ink-mute);--board-frame: #100b07;--board-light: var(--sq-light);--board-dark: var(--sq-dark);--board-coords: var(--ink-mute);--piece-light-bg: #efe3ce;--piece-light-text: var(--ink);--piece-light-border: rgba(30, 24, 20, .7);--piece-light-glow: rgba(255, 245, 220, .46);--piece-dark-bg: #14100c;--piece-dark-text: #f4ead6;--piece-dark-border: rgba(255, 247, 230, .68);--piece-dark-glow: rgba(255, 226, 180, .28);--piece-edge-shadow: rgba(0, 0, 0, .48);--last-move: rgba(210, 162, 90, .28);--control-shadow: 0 1px 0 rgba(255, 255, 255, .04)}.ref{display:inline;padding:.05em .35em;border:0;border-radius:6px;font-weight:600;cursor:pointer;background:var(--parchment-2);color:var(--ink);transition:outline-color 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3px 0;background:var(--brass)}.tablet-rail-icon-wrap{position:relative;display:grid;place-items:center}.tablet-rail-badge{position:absolute;top:-6px;right:-10px;min-width:18px;height:18px;padding:0 5px;display:grid;place-items:center;background:var(--burgundy);color:#fff;font-size:10px;font-weight:700;border-radius:9px;font-family:var(--sans)}.tablet-rail-label{font-family:var(--sans);font-size:10px;font-weight:600;letter-spacing:.02em}.streak-toast{position:fixed;top:max(14px,env(safe-area-inset-top));left:50%;transform:translate(-50%);display:flex;align-items:center;gap:12px;width:min(360px,calc(100vw - 32px));max-width:calc(100vw - 32px);padding:12px 14px;border-radius:var(--r-lg);border:1px solid var(--brass-deep);background:linear-gradient(180deg,var(--brass-light),var(--brass));color:#2b1e09;box-shadow:var(--shadow-2);z-index:50;font-family:var(--sans);animation:streak-toast-slide-in .22s 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#9fb8d2;--board-dark: #315981;--board-coords: #7f97ad}.board-wrap{--board-coordinate-gutter: 14px;--board-frame-width: 10px;--board-label-font-size: 11px;width:min(66vh,100%,690px);min-width:320px}.board-coordinate-row,.board-middle{display:grid;grid-template-columns:var(--board-coordinate-gutter) minmax(0,1fr) var(--board-coordinate-gutter);gap:2px}.board-middle{align-items:stretch}.board-grid{position:relative;width:100%;aspect-ratio:1;display:grid;grid-template-columns:repeat(8,1fr);border:var(--board-frame-width) solid var(--board-frame);border-radius:8px;overflow:hidden;box-shadow:0 16px 30px #12191738;background:var(--board-frame)}.board-arrows{position:absolute;z-index:3;inset:var(--board-frame-width);overflow:visible;pointer-events:none}.board-arrow{fill:none;stroke:var(--role-attacker);stroke-linecap:round;stroke-linejoin:round;stroke-width:3px;filter:drop-shadow(0 1px 1px rgba(18,25,23,.3))}.board-arrow-head{fill:var(--role-attacker)}.rank-files{width:calc(100% - 8px);margin:0 auto;display:grid;grid-template-columns:repeat(8,1fr);color:var(--board-coords);font-size:var(--board-label-font-size);font-weight:800;text-align:center;text-transform:uppercase}.rank-labels{display:grid;grid-template-rows:repeat(8,1fr);align-self:stretch;min-width:var(--board-coordinate-gutter);padding:var(--board-frame-width) 0;color:var(--board-coords);font-size:var(--board-label-font-size);font-weight:800;text-align:center;box-sizing:border-box}.rank-labels span{display:grid;place-items:center}.files-top{margin-bottom:1px}.files-bottom{margin-top:1px}.board-square{position:relative;display:grid;place-items:center;width:100%;aspect-ratio:1;border:0;padding:0;cursor:pointer;color:inherit;touch-action:manipulation}.board-square[data-interactive=true]{touch-action:none}.board-square.light{background:var(--board-light)}.board-square.dark{background:var(--board-dark)}.board-square.selected{outline:4px solid 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