:root{--sq:72px}*,:before,:after{box-sizing:border-box}html,body{color:#eee;overscroll-behavior-y:contain;background:#1a1a1a;height:100%;margin:0;padding:0;font-family:sans-serif}body{flex-direction:row;align-items:flex-start;display:flex}.sidebar{flex-direction:column;flex-shrink:0;gap:2rem;width:180px;max-height:100vh;padding:1.5rem;display:flex;overflow-y:auto}h1{margin:0;font-size:1.3rem;line-height:1.35}.hint{color:#555;margin:0;font-size:12px;line-height:1.7}.sidebar button{color:#ccc;cursor:pointer;background:#333;border:1px solid #555;border-radius:4px;padding:.5rem .75rem;font-size:13px}.sidebar button:hover{color:#eee;background:#444}.sidebar button:disabled{opacity:.35;cursor:default}.sidebar button:disabled:hover{color:#ccc;background:#333}.btn-row{gap:.5rem;display:flex}.sidebar .btn-row button{text-align:center;flex:1;padding:.4rem 0;font-size:16px}#app{touch-action:none;outline:none;overflow:hidden}.board-wrapper{will-change:transform;flex-direction:column;display:flex}.board-row{flex-direction:row;display:flex}.board-row--top{box-shadow:0 -2px #777}.board-row--bottom{box-shadow:0 2px #777}.row-label{width:calc(var(--sq) / 2);height:var(--sq);padding-right:calc(var(--sq) * .08);color:#444;-webkit-user-select:none;user-select:none;background:#222;flex-shrink:0;justify-content:flex-end;align-items:center;font-family:monospace;font-size:11px;display:flex}.row-label--original{color:#888}.square{width:var(--sq);height:var(--sq);cursor:pointer;flex-shrink:0;justify-content:center;align-items:center;display:flex}.square.light{background:#f0d9b5}.square.dark{background:#b58863}.square.selected{background:#f6f669}.square.in-check{background:#e74c3c}.square.legal-move:after,.square.legal-capture:after{content:"";pointer-events:none;position:absolute}.square{position:relative}.square.legal-move:after{width:calc(var(--sq) * .25);height:calc(var(--sq) * .25);background:#00000040;border-radius:50%}.square.legal-capture:after{width:calc(var(--sq) * .83);height:calc(var(--sq) * .83);border:calc(var(--sq) * .07) solid #00000040;background:0 0;border-radius:50%}.square:hover{filter:brightness(1.1)}.piece{font-size:calc(var(--sq) * .72);pointer-events:none;-webkit-user-select:none;user-select:none;line-height:1}.piece.white{color:#fff;text-shadow:0 0 3px #000,0 0 3px #000}.piece.black{color:#1a1a1a;text-shadow:0 0 3px #888}.captures{font-size:16px;line-height:1.3}.capture-line{align-items:baseline;gap:2px;min-height:1.3em;display:flex}.cap-king{margin-right:4px}.cap-piece{font-size:14px}.cap-white{color:#ddd;text-shadow:0 0 2px #000}.cap-black{color:#888;text-shadow:0 0 2px #444}.status-text{color:#aaa;margin:0;font-size:14px;font-weight:700}.status-text.check{color:#e74c3c}.status-text.gameover{color:#f39c12}.move-log{font-family:monospace;font-size:12px}.move-line{color:#aaa;gap:.4em;padding:1px 0;display:flex}.move-num{color:#666;text-align:right;min-width:3ch}.move-ply{min-width:6ch}.sidebar-open-btn,.sidebar .sidebar-close-btn{display:none}@media (width<=600px){.sidebar{z-index:50;background:#1a1a1a;transition:transform .2s;position:fixed;top:0;left:0;transform:translate(-100%)}.sidebar.open{transform:translate(0)}.sidebar-open-btn{z-index:40;color:#ccc;cursor:pointer;background:#333333d9;border:1px solid #555;border-radius:4px;padding:6px 10px;font-size:14px;line-height:1;display:block;position:fixed;top:8px;left:8px}.sidebar-open-btn.hidden{display:none}.sidebar .sidebar-close-btn{color:#888;cursor:pointer;background:0 0;border:none;padding:4px;font-size:16px;line-height:1;display:block;position:absolute;top:12px;right:12px}}.promotion-overlay{z-index:100;background:#0009;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.promotion-dialog{background:#2a2a2a;border:2px solid #555;border-radius:8px;gap:.5rem;padding:1rem;display:flex}.promotion-dialog .promo-btn{cursor:pointer;-webkit-user-select:none;user-select:none;background:#b58863;border:2px solid #777;border-radius:4px;justify-content:center;align-items:center;width:72px;height:72px;font-size:52px;line-height:1;display:flex}.promotion-dialog .promo-btn:hover{background:#d4a96a}
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