:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media (prefers-color-scheme: light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}.sudoku-grid>:nth-child(19){border-bottom:3px solid #333}.sudoku-grid>:nth-child(20){border-bottom:3px solid #333}.sudoku-grid>:nth-child(21){border-bottom:3px solid #333}.sudoku-grid>:nth-child(22){border-bottom:3px solid #333}.sudoku-grid>:nth-child(23){border-bottom:3px solid #333}.sudoku-grid>:nth-child(24){border-bottom:3px solid #333}.sudoku-grid>:nth-child(25){border-bottom:3px solid #333}.sudoku-grid>:nth-child(26){border-bottom:3px solid #333}.sudoku-grid>:nth-child(27){border-bottom:3px solid #333}.sudoku-grid>:nth-child(46){border-bottom:3px solid #333}.sudoku-grid>:nth-child(47){border-bottom:3px solid #333}.sudoku-grid>:nth-child(48){border-bottom:3px solid #333}.sudoku-grid>:nth-child(49){border-bottom:3px solid #333}.sudoku-grid>:nth-child(50){border-bottom:3px solid #333}.sudoku-grid>:nth-child(51){border-bottom:3px solid #333}.sudoku-grid>:nth-child(52){border-bottom:3px solid #333}.sudoku-grid>:nth-child(53){border-bottom:3px solid #333}.sudoku-grid>:nth-child(54){border-bottom:3px solid #333}.sudoku-cell:nth-child(3n):not(:nth-child(9n)){border-right:3px #333 solid}.sudoku-cell{width:50px;height:50px;font-size:24px;text-align:center;border:1px solid #bbb;box-sizing:border-box;outline:none;transition:background-color .2s ease;color:#000}.sudoku-cell:hover{background-color:#cfcccc}.sudoku-cell:focus{border-color:#007bff;box-shadow:0 0 5px #007bff80}.conflict{background-color:#ffe6e6;border-color:red;color:red}.conflict:focus{box-shadow:0 0 5px #ff000080}.conflict:hover{background-color:#fcc}.block-even{background-color:#f1f1f1}.block-odd{background-color:#fff}.sudoku-cell.pre-filled{font-weight:700;color:#333;background-color:#a3a0a0;cursor:default}.sudoku-cell.pre-filled.conflict{background-color:#b87676;border-color:#bb4747;color:#333}.sudoku-cell.pre-filled:hover{cursor:not-allowed}.sudoku-board-container{display:flex;flex-direction:column;align-items:center;padding:20px;font-family:Arial,sans-serif}.difficulty-buttons{display:flex;gap:10px;margin-bottom:20px}h2{color:#fff;margin-bottom:20px}.sudoku-grid{display:grid;grid-template-columns:repeat(9,11.1111111111%);grid-template-rows:repeat(9,11.1111111111%);border:4px solid #333;box-shadow:0 0 10px #0003}.game-actions{margin-top:20px;display:flex}.overall-feedback-message{margin-top:20px;padding:10px 15px;border-radius:8px;font-size:1.2em;font-weight:700;text-align:center;color:#333;background-color:#e8f5e9;border:1px solid #c8e6c9;box-shadow:0 2px 5px #0000001a;animation:fadeIn .5s ease-out}.overall-feedback-message.correct{background-color:#e8f5e9;color:#2e7d32;border-color:#a5d6a7}.overall-feedback-message.incomplete{background-color:#fffde7;color:#fbc02d;border-color:#ffe082}.overall-feedback-message.incorrect{background-color:#ffebee;color:#c62828;border-color:#ef9a9a}@keyframes fadeIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.game-actions{margin-top:20px;display:flex;justify-content:center;gap:10px}.game-actions button{padding:10px 20px;font-size:1em;cursor:pointer;background-color:#4caf50;color:#fff;border:none;border-radius:5px;transition:background-color .3s ease}.game-actions button:hover{background-color:#45a049}.game-actions button:active{background-color:#3e8e41}.game-actions .reset-button{background-color:#f39c12}.game-actions .reset-button:hover{background-color:#e67e22}.game-actions .reset-button:active{background-color:#d35400}#root{max-width:1280px;margin:0 auto;padding:2rem;text-align:center}