.sudoku-solver{justify-content:center;padding:2rem;display:flex}.sudoku-container{flex-direction:column;align-items:center;gap:2rem;display:flex}.sudoku-grid{background:#fff;border:2px solid #333;display:inline-block}.sudoku-row{display:flex}.sudoku-cell{text-align:center;background:#fff;border:1px solid #ccc;outline:none;width:50px;height:50px;font-size:18px;font-weight:700}.sudoku-cell:focus{background:#e3f2fd;border-color:#2196f3}.sudoku-cell.fixed{color:#333;cursor:not-allowed;background:#f0f0f0;font-weight:700}.sudoku-cell.border-bottom{border-bottom:2px solid #333}.sudoku-cell.border-right{border-right:2px solid #333}.sudoku-controls{flex-flow:wrap;justify-content:center;align-items:center;gap:1rem;display:flex}.sudoku-controls .button{flex:1;min-width:150px;max-width:200px}.sudoku-difficulty-buttons{flex-wrap:wrap;justify-content:center;gap:.5rem;display:flex}.difficulty-buttons .button{flex:0 auto;min-width:140px;padding:.5rem 1rem;font-size:.9rem}