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0}.example-cell{width:40px;height:40px;display:flex;align-items:center;justify-content:center;font-weight:700;border-radius:4px;font-size:14px}.example-cell.unknown{background:#7f8c8d;color:#fff}.example-cell.safe{background:#27ae60;color:#fff}.example-cell.number{background:#3498db;color:#fff;font-weight:700}.example-cell.mine{background:#e74c3c;color:#fff}.difficulty-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:15px;margin-top:15px}.difficulty-item{background:rgba(44,62,80,.6);padding:15px;border-radius:8px;border-left:4px solid #f39c12}.difficulty-name{font-weight:700;font-size:1.1rem;margin-bottom:5px}.difficulty-desc{font-size:.9rem;opacity:.9}.tips-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:15px;margin-top:15px}.tip-item{background:rgba(46,204,113,.1);border:1px solid rgba(46,204,113,.3);padding:15px;border-radius:8px;border-left:4px solid 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