body{font-family:"Roboto",sans-serif;margin:0;background:#ecf0f1;color:#2c3e50;}header{background:#2980b9;color:white;padding:20px;text-align:center;}nav{background:#3498db;display:flex;justify-content:center;gap:25px;padding:12px;}main{padding:40px;}section.block{background:#fff;border-radius:12px;box-shadow:0 6px 12px rgba(0,0,0,0.12);padding:24px;margin:22px;}h1{color:#2c3e50;font-size:2.5rem;}p{line-height:1.8;}hr{border:1px solid #2980b9;}footer{background:#2980b9;color:#fff;text-align:center;padding:20px;} ol{list-style-type:square;background:#fafafa;border:1px dashed #999;padding:20px 30px;line-height:1.8;}