body{margin:0;font-family:Segoe UI;background:#f9fafb;color:#333}
header{position:sticky;top:0;background:rgba(11,61,46,0.9);color:#fff;padding:15px}
.nav{display:flex;justify-content:space-between;align-items:center}
nav ul{display:flex;list-style:none}
nav ul li{margin:0 15px}
nav a{color:#fff;text-decoration:none}
.btn{background:#28a745;color:#fff;padding:10px 18px;border-radius:25px}
.hero{background:url('../images/hero.jpg') center/cover;height:90vh;color:#fff;display:flex;align-items:center;justify-content:center;text-align:center}
.section{padding:60px}
.card{background:#fff;padding:20px;margin:10px;border-radius:10px;box-shadow:0 5px 10px rgba(0,0,0,0.1)}
footer{background:#111;color:#fff;text-align:center;padding:20px}