.piece{-webkit-user-select:none;user-select:none;pointer-events:none;object-fit:contain;width:95%;height:95%}.square{aspect-ratio:1;cursor:pointer;background-color:var(--sq-color);background-image:var(--sq-texture,none);border:none;justify-content:center;align-items:center;margin:0;padding:0;display:flex;position:relative}.square-light{--sq-color:var(--board-light);--sq-texture:var(--board-light-texture,none)}.square-dark{--sq-color:var(--board-dark);--sq-texture:var(--board-dark-texture,none)}.square-selected{--sq-color:var(--square-selected)!important;--sq-texture:none!important}.square-last-move.square-light{--sq-color:var(--square-last-move-light);--sq-texture:none}.square-last-move.square-dark{--sq-color:var(--square-last-move-dark);--sq-texture:none}.square-valid-move{cursor:pointer}.square-capture{box-shadow:inset 0 0 0 3px var(--square-capture);border-radius:0}.move-indicator{background-color:var(--square-valid-move);pointer-events:none;border-radius:50%;width:28%;height:28%}.square:hover{filter:brightness(1.1)}.coord{pointer-events:none;z-index:1;font-size:.7em;font-weight:700;line-height:1;position:absolute}.coord-rank{top:3%;left:5%}.coord-file{bottom:3%;right:5%}.coord-light{color:var(--board-light)}.coord-dark{color:var(--board-dark)}.board-container{flex-direction:column;flex-shrink:0;align-items:center;display:flex}.board{width:var(--board-dimension);height:var(--board-dimension);border:2px solid var(--board-border);display:grid}.game-info{color:var(--text-primary);flex-direction:column;gap:.5rem;padding:1rem;display:flex}.status{font-size:1.25rem;font-weight:600}.status-check{color:var(--status-check)}.status-checkmate{color:var(--status-checkmate)}.status-stalemate{color:var(--status-stalemate)}.game-controls{gap:.5rem;display:flex}.control-button{background-color:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:6px;padding:.375rem .75rem;font-size:1rem;font-weight:600;transition:background-color .15s}.control-button:hover:not(:disabled){background-color:var(--accent-hover)}.control-button:disabled{opacity:.5;cursor:not-allowed}.move-count{color:var(--text-muted);font-size:.875rem}.theme-mode-picker{border:1px solid var(--border-input);border-radius:6px;gap:0;display:flex;overflow:hidden}.theme-mode-button{background-color:var(--bg-input);color:var(--text-primary);cursor:pointer;border:none;flex:1;padding:.375rem .625rem;font-size:.8rem;font-weight:500;transition:background-color .15s,border-color .15s}.theme-mode-button:not(:last-child){border-right:1px solid var(--border-input)}.theme-mode-button:hover:not(.theme-mode-active){background-color:var(--bg-input-hover)}.theme-mode-button:focus-visible{outline:2px solid var(--accent);outline-offset:-2px;z-index:1}.theme-mode-active{background-color:var(--accent);color:#fff;font-weight:600}.settings-panel{background-color:var(--bg-panel);border-radius:8px;flex-direction:column;gap:1.25rem;min-width:220px;padding:1.5rem;display:flex}.settings-title{color:var(--text-primary);margin:0;font-size:1.25rem}.setting-group{flex-direction:column;gap:.5rem;display:flex}.setting-label{color:var(--text-primary);margin:0;font-size:.875rem;font-weight:600}.board-size-slider{width:100%;accent-color:var(--accent)}.setting-select{border:1px solid var(--border-input);background-color:var(--bg-input);color:var(--text-primary);border-radius:4px;padding:.375rem .5rem;font-size:.8rem}.theme-grid{flex-wrap:wrap;gap:.375rem;display:flex}.theme-swatch{cursor:pointer;border:2px solid #0000;border-radius:4px;flex-wrap:wrap;width:36px;height:36px;padding:0;display:flex;overflow:hidden}.theme-swatch-active{border-color:var(--accent)}.swatch-light,.swatch-dark{width:50%;height:100%}.pieces-list{flex-direction:column;gap:.375rem;display:flex}.piece-toggle{color:var(--text-primary);cursor:pointer;align-items:center;gap:.5rem;font-size:.8rem;display:flex}.piece-toggle-icon{width:22px;height:22px}.piece-badge{background-color:var(--badge-bg);color:var(--badge-text);border-radius:3px;padding:1px 5px;font-size:.65rem}.back-rank-preview{background-color:var(--bg-input);border-radius:4px;flex-wrap:wrap;gap:2px;padding:.375rem;display:flex}.back-rank-piece{width:24px;height:24px}.validation-error{color:var(--status-checkmate);margin:0;font-size:.75rem;line-height:1.3}.pgn-textarea{border:1px solid var(--border-input);background-color:var(--bg-input);width:100%;color:var(--text-primary);resize:vertical;border-radius:4px;padding:.5rem;font-family:monospace;font-size:.8rem}.pgn-textarea::placeholder{color:var(--text-muted)}.import-buttons{gap:.5rem;display:flex}.import-button{flex:1;padding:.5rem .75rem;font-size:.8rem}.file-input-hidden{display:none}.reset-button{background-color:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:6px;padding:.625rem 1rem;font-size:.875rem;font-weight:600;transition:background-color .15s}.reset-button:hover:not(:disabled){background-color:var(--accent-hover)}.reset-button:disabled{opacity:.5;cursor:not-allowed}.move-transcript{background-color:var(--bg-panel);border-radius:8px;flex-direction:column;gap:1rem;min-width:220px;padding:1.5rem;display:flex;position:relative}.transcript-header{justify-content:space-between;align-items:center;display:flex}.transcript-title{color:var(--text-primary);margin:0;font-size:1.25rem}.gear-button{color:var(--text-muted);cursor:pointer;background-color:#0000;border:none;border-radius:6px;padding:.375rem;font-size:1.25rem;line-height:1;transition:color .15s}.gear-button:hover{color:var(--text-primary)}.gear-button-active{color:var(--accent)}.settings-popover{z-index:100;position:absolute;top:3.5rem;right:0;box-shadow:0 4px 16px #0006}.move-list{max-height:360px;color:var(--text-primary);grid-template-columns:auto 1fr 1fr;gap:.125rem .5rem;font-family:monospace;font-size:.8rem;display:grid;overflow-y:auto}.move-number{color:var(--text-muted);text-align:right}.move-san{border-radius:3px;padding:.125rem .25rem}.copy-button{background-color:var(--bg-input);color:var(--text-primary);cursor:pointer;border:none;border-radius:6px;padding:.625rem 1rem;font-size:.875rem;font-weight:600;transition:background-color .15s}.copy-button:hover{background-color:var(--bg-input-hover)}.copy-button-copied{background-color:var(--accent);color:#fff}.promotion-overlay{z-index:100;background-color:#0009;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.promotion-dialog{background-color:var(--bg-panel);border-radius:12px;flex-direction:column;align-items:center;gap:1rem;padding:1.5rem;display:flex;box-shadow:0 8px 32px #0006}.promotion-title{color:var(--text-primary);margin:0;font-size:1rem}.promotion-options{gap:.75rem;display:flex}.promotion-option{border:2px solid var(--board-border);background-color:var(--board-light);cursor:pointer;border-radius:8px;justify-content:center;align-items:center;width:64px;height:64px;font-size:40px;transition:background-color .15s,transform .1s;display:flex}.promotion-option:hover{background-color:var(--square-selected);transform:scale(1.1)}.game{align-items:flex-start;gap:2rem;max-width:1200px;margin:0 auto;padding:2rem;display:flex}.game-main{flex-direction:column;flex-shrink:1;gap:.5rem;min-width:0;display:flex}@media (width<=768px){.game{flex-direction:column;align-items:center;padding:1rem}}:root,[data-theme=dark]{--board-light:#f0d9b5;--board-dark:#b58863;--board-border:#8b7355;--square-selected:#ffff0080;--square-valid-move:#00000040;--square-capture:#f009;--text-primary:#e0e0e0;--text-muted:#999;--bg-primary:#312e2b;--bg-panel:#272522;--bg-input:#3a3835;--bg-input-hover:#4a4845;--border-input:#555;--badge-bg:#555;--badge-text:#ccc;--accent:#769656;--accent-hover:#8aad6a;--status-check:orange;--status-checkmate:#f44;--status-stalemate:#88f;--square-last-move-light:#f0e4a8;--square-last-move-dark:#c4a836}[data-theme=light]{--board-light:#f0d9b5;--board-dark:#b58863;--board-border:#8b7355;--square-selected:#ffd7008c;--square-valid-move:#0000002e;--square-capture:#dc26268c;--text-primary:#1f1d1b;--text-muted:#6b6b6b;--bg-primary:#f5f0e8;--bg-panel:#fff;--bg-input:#fff;--bg-input-hover:#ece6da;--border-input:#c8c0b0;--badge-bg:#d8d0c0;--badge-text:#555;--accent:#5a7a3e;--accent-hover:#4a6a32;--status-check:#b86e00;--status-checkmate:#c01818;--status-stalemate:#4848aa;--square-last-move-light:#f0e4a8;--square-last-move-dark:#c4a836}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-primary);color:var(--text-primary);min-height:100vh;font-family:system-ui,-apple-system,sans-serif}.app{flex-direction:column;align-items:center;padding:1rem;display:flex}.app-title{color:var(--text-primary);margin-bottom:.5rem;font-size:1.75rem;font-weight:700}