body{font-family:Arial,sans-serif;margin:0;background:#f5fbff;color:#234}
header{background:linear-gradient(90deg,#0a7,#09c);color:#fff;padding:16px;position:sticky;top:0}
nav a{color:#fff;margin:0 10px;text-decoration:none}
.hero{padding:80px 20px;text-align:center;background:#e8f8ff}
.card{max-width:700px;margin:30px auto;background:#fff;padding:20px;border-radius:12px;box-shadow:0 2px 8px #ccc}
.btn,.wa{display:inline-block;background:#25D366;color:#fff;padding:12px 18px;border-radius:8px;text-decoration:none}
footer{text-align:center;padding:20px}