body{font-family:Arial,sans-serif;margin:0;line-height:1.6}header{display:flex;justify-content:space-between;padding:20px;background:#0f172a;color:#fff}nav a{color:#fff;margin-left:15px;text-decoration:none}.hero{padding:80px 20px;text-align:center;background:#2563eb;color:#fff}.btn{background:#fff;color:#2563eb;padding:10px 18px;text-decoration:none;border-radius:6px}section{padding:40px 20px;max-width:900px;margin:auto}footer{text-align:center;padding:20px;background:#0f172a;color:#fff}