:root{--bg-color: #f5f5f5;--text-color: #333;--primary-color: #3498db;--secondary-color: #2980b9;--card-bg: #ffffff;--slider-bg: #d1d1d1;--border-color: #e0e0e0;--success-color: #2ecc71;--checkbox-size: 20px;--password-bg: #edf2f7}@media (prefers-color-scheme: dark){:root{--bg-color: #1a1a1a;--text-color: #f0f0f0;--primary-color: #3498db;--secondary-color: #2980b9;--card-bg: #2d2d2d;--slider-bg: #555555;--border-color: #444444;--success-color: #25a25a;--password-bg: #2c3e50}}*{margin:0;padding:0;box-sizing:border-box;transition:background-color .3s,color .3s}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background-color:var(--bg-color);color:var(--text-color);font-size:18px;line-height:1.6;padding:20px;min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center}.container{max-width:500px;width:100%;background-color:var(--card-bg);border-radius:10px;padding:30px;box-shadow:0 4px 8px #0000001a}h1{text-align:center;margin-bottom:20px;font-size:1.8rem}.password-display{background-color:var(--password-bg);padding:15px;border-radius:8px;margin-bottom:20px;font-family:monospace;font-size:1.2rem;position:relative;word-break:break-all;border:1px solid var(--border-color)}.copy-btn{position:absolute;right:10px;top:50%;transform:translateY(-50%);background:var(--primary-color);color:#fff;border:none;border-radius:4px;padding:5px 10px;cursor:pointer;font-size:.8rem}.copy-btn:hover{background:var(--secondary-color)}.entropy{text-align:right;font-size:.8rem;margin-bottom:15px;opacity:.8}.options-group{margin-bottom:25px}.option-title{font-weight:700;margin-bottom:10px}.password-length{display:flex;align-items:center;margin-bottom:5px}.password-length span{min-width:30px;text-align:right}input[type=range]{width:100%;margin:10px 0;height:6px;border-radius:5px;background:var(--slider-bg)}input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:20px;height:20px;border-radius:50%;background:var(--primary-color);cursor:pointer}.generate-btn{background-color:var(--primary-color);color:#fff;border:none;padding:12px 20px;border-radius:6px;width:100%;cursor:pointer;font-size:1rem;margin-top:10px;transition:background-color .2s}.generate-btn:hover{background-color:var(--secondary-color)}.checkbox-container{display:flex;align-items:center;margin-bottom:10px;cursor:pointer}.custom-checkbox{width:var(--checkbox-size);height:var(--checkbox-size);border:2px solid var(--primary-color);border-radius:4px;margin-right:10px;display:flex;align-items:center;justify-content:center;position:relative}.checkbox-container input{position:absolute;opacity:0;height:0;width:0}.checkmark{display:none;color:#fff;font-size:14px}.checkbox-container input:checked~.custom-checkbox{background-color:var(--primary-color)}.checkbox-container input:checked~.custom-checkbox .checkmark{display:block}@media (max-width: 600px){.container{padding:20px;width:95%}h1{font-size:1.5rem}}