body{font-family:Arial,Helvetica,sans-serif;margin:0;background:#0b1220;color:#fff}
.container{max-width:1100px;margin:auto;padding:20px}
header{background:#0f1b33;padding:10px}
nav a{color:#fff;margin-right:15px;text-decoration:none;font-weight:bold}
.btn{background:#22c55e;color:#000;padding:10px 15px;border-radius:6px;text-decoration:none;font-weight:bold}
.card{background:#0f1b33;padding:20px;border-radius:10px;margin-top:20px}