body{font-family:Segoe UI,Arial,sans-serif;margin:0;background:#f8fafc;color:#1f2937;line-height:1.8}
header{background:#0f172a;color:#fff;padding:60px 20px;text-align:center}
nav{background:#fff;padding:15px;text-align:center;box-shadow:0 2px 6px rgba(0,0,0,.1)}
nav a{margin:0 10px;text-decoration:none;color:#111;font-weight:600}
main{max-width:1100px;margin:auto;padding:30px}
article{background:#fff;padding:30px;border-radius:12px;box-shadow:0 2px 8px rgba(0,0,0,.08)}
footer{background:#0f172a;color:#fff;text-align:center;padding:20px;margin-top:40px}