.sudoku-container{flex-direction:column;align-items:center;gap:24px;width:100%;display:flex}.sudoku-board{aspect-ratio:1;box-sizing:border-box;background-color:#fff;border:4px solid #333;flex-wrap:wrap;width:324px;max-width:100%;display:flex;box-shadow:0 4px 8px #0000001a}.sudoku-row{box-sizing:border-box;width:100%;display:flex}.sudoku-cell{aspect-ratio:1;color:#333;box-sizing:border-box;cursor:pointer;border:1px solid #ddd;justify-content:center;align-items:center;width:11.1111%;height:36px;font-size:1.25rem;font-weight:700;transition:background-color .2s,border-color .2s;display:flex}.sudoku-cell:nth-child(3n){border-right:3px solid #333}.sudoku-cell:nth-child(9n){border-right:1px solid #ddd}.sudoku-row:nth-child(3n) .sudoku-cell{border-bottom:3px solid #333}.sudoku-row:nth-child(9n) .sudoku-cell{border-bottom:1px solid #ddd}.sudoku-cell:hover{background-color:#e8f5e9}.selected-cell{background-color:#bbdefb}.initial-cell{color:#263238;cursor:not-allowed;background-color:#eceff1}.error-cell{color:#c62828;background-color:#ffcdd2}.button-group{flex-wrap:wrap;justify-content:center;gap:12px;display:flex}.game-btn{cursor:pointer;border:none;border-radius:6px;padding:10px 20px;font-size:1rem;transition:background-color .3s,transform .1s}.game-btn-primary{color:#fff;background-color:#4caf50}.game-btn-secondary{color:#fff;background-color:#9e9e9e}.game-btn-danger{color:#fff;background-color:#f44336}.game-btn-info{color:#fff;background-color:#2196f3}.mobile-controls{flex-direction:column;align-items:center;width:100%;display:flex}.number-pad{grid-template-columns:repeat(3,1fr);gap:10px;width:200px;max-width:100%;margin-top:10px;display:grid}.game-btn-touch-control{background-color:#e0e0e0;border-radius:50%;justify-content:center;align-items:center;width:60px;height:60px;font-size:1.5rem;font-weight:700;display:flex}.game-btn-touch-control.clear-button{background-color:#bdbdbd}@media (width<=420px){.sudoku-board{border-width:3px;width:100%}.sudoku-cell{height:auto;font-size:1rem}.number-pad{width:100%;max-width:220px}.game-btn-touch-control{border-radius:8px;width:100%;height:48px}}