body{color:#333;background-color:#f4f7f6;margin:0;padding:20px;font-family:Segoe UI,Tahoma,sans-serif;line-height:1.6}.container{background:#fff;border-radius:8px;max-width:800px;margin:0 auto;padding:30px;box-shadow:0 4px 6px #0000001a}h1,h2{text-align:center;color:#2c3e50}button{color:#fff;cursor:pointer;background-color:#3498db;border:none;border-radius:5px;padding:10px 15px;font-size:16px;transition:all .3s}button:hover{background-color:#2980b9}button:disabled{cursor:not-allowed;background-color:#95a5a6}.question-block{page-break-inside:avoid;border-bottom:1px solid #eee;margin-bottom:20px;padding-bottom:15px}.options label{cursor:pointer;margin-bottom:8px;display:block}