:root{--bg-color:#faf8ef;--text-color:#776e65;--grid-bg:#bbada0;--cell-bg:rgba(238,228,218,0.35);}body.dark{--bg-color:#1a1a2e;--text-color:#e94560;--grid-bg:#16213e;--cell-bg:#0f3460;}body.neon{--bg-color:#000;--text-color:#0f0;--grid-bg:#222;--cell-bg:#111;}body{background:var(--bg-color);color:var(--text-color);font-family:sans-serif;display:flex;justify-content:center;}.container{width:400px;margin-top:50px;}.header{display:flex;justify-content:space-between;align-items:center;}.controls{margin:20px 0;display:flex;gap:10px;}.game-container{position:relative;width:400px;height:400px;background:var(--grid-bg);border-radius:6px;padding:10px;box-sizing:border-box;}.grid-container{display:grid;gap:10px;width:100%;height:100%;}.grid-cell{background:var(--cell-bg);border-radius:3px;}.tile-container{position:absolute;top:10px;left:10px;width:calc(100% - 20px);height:calc(100% - 20px);pointer-events:none;}.tile{position:absolute;border-radius:3px;display:flex;justify-content:center;align-items:center;font-size:35px;font-weight:bold;transition:100ms ease-in-out;color:#fff;}