:root{color-scheme:dark;font-family:system-ui,"Microsoft YaHei",sans-serif;color:#f5f2e9;background:#11141f}*{box-sizing:border-box}body{margin:0;padding:18px}button{font:inherit;color:inherit;background:#242638;border:1px solid #606079;min-height:44px;padding:8px 16px;border-radius:6px;cursor:pointer}button:hover{border-color:#d9ff68}button:focus-visible,[tabindex]:focus-visible{outline:3px solid #d9ff68;outline-offset:4px}button:disabled{opacity:.5;cursor:default}[hidden]{display:none!important}.game-shell{width:100%;min-width:0;max-width:640px;margin:auto}.game-toolbar{display:flex;gap:10px;justify-content:space-between;align-items:center;flex-wrap:wrap;margin-bottom:14px}.game-toolbar p{margin:0;font-size:14px;color:#b8bfce}.game-controls{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin:16px 0}.game-controls button{min-width:60px;touch-action:none}.game-help{font-size:13px;line-height:1.7;color:#b8bfce;margin:12px 0}.game-status{min-height:24px;font-size:14px;color:#d9ff68}.board-2048{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;background:#353247;border-radius:10px;padding:9px;aspect-ratio:1;max-width:420px;margin:0 auto;touch-action:none;user-select:none}.board-2048>span{display:flex;align-items:center;justify-content:center;min-width:0;border-radius:7px;background:#222533;color:#f5f2e9;font-size:clamp(20px,8vw,42px);font-weight:800}.board-2048>span[data-value="2"],.board-2048>span[data-value="4"]{background:#514b6e}.board-2048>span[data-value="8"],.board-2048>span[data-value="16"]{background:#71608a}.board-2048>span[data-value="32"],.board-2048>span[data-value="64"]{background:#9a6da5}.board-2048>span[data-high]{background:#d9ff68;color:#11141f;font-size:clamp(17px,6vw,32px)}.board-2048[data-paused=true]{opacity:.5}.game-canvas{display:block;width:100%;height:auto;aspect-ratio:640/480;max-width:640px;background:radial-gradient(ellipse at top,#302547,#0b101b 70%);border:1px solid #5b4d76;border-radius:8px;touch-action:none}.game-score{font-variant-numeric:tabular-nums}.game-storage{font-size:12px;color:#b8bfce}.game-source{font-size:12px;color:#b8a1ff}.game-source a{color:inherit}@media(max-width:380px){body{padding:10px}.board-2048{gap:6px;padding:6px}.game-toolbar{gap:7px}.game-controls button{padding:8px 12px}}