*{margin:0;padding:0;box-sizing:border-box}body{font-family:Arial,sans-serif;color:#111;background:#fff}
header{padding:80px 20px;text-align:center}
nav{position:sticky;top:0;background:#fff;padding:16px;border-bottom:1px solid #eee;text-align:center}
nav a{margin:0 14px;color:#111;text-decoration:none}
section{max-width:1000px;margin:auto;padding:70px 20px}
.hero h1{font-size:56px}.hero p{margin:18px 0;color:#666;font-size:20px}
.btn{display:inline-block;padding:14px 24px;background:#111;color:#fff;border-radius:30px;text-decoration:none}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px}
.card{border:1px solid #eee;border-radius:18px;padding:24px}
footer{text-align:center;padding:40px;color:#777;border-top:1px solid #eee}