body{margin:0;font-family:Arial;background:#0f172a;color:#fff}
header{display:flex;justify-content:space-between;padding:20px;background:#020617}
nav a{color:#fff;margin:0 10px;text-decoration:none}
.hero{text-align:center;padding:100px;background:#1e293b}
.btn{display:inline-block;margin-top:20px;padding:10px 20px;background:#22c55e;color:#000;text-decoration:none}
section{padding:40px}
footer{text-align:center;padding:20px;background:#020617}