body{font-family:Arial,sans-serif;margin:0;background:#f5f7fa;color:#222}header,footer{background:#0b3d5c;color:#fff;padding:20px}nav a{color:#fff;margin-right:15px}main{max-width:1000px;margin:auto;padding:40px}section{background:#fff;padding:30px;border-radius:8px}