body{margin:0;font-family:Arial,Helvetica,sans-serif;background:#0f172a;color:#e2e8f0}.nav{display:flex;justify-content:space-between;align-items:center;padding:24px 60px;border-bottom:1px solid #1f2937}.logo-img{height:50px}.nav a{margin-left:30px;text-decoration:none;color:#cbd5e1}.btn{background:#10b981;padding:10px 20px;color:#fff;text-decoration:none;border-radius:6px}.hero{text-align:center;padding:140px 20px}.section{padding:100px 20px;max-width:900px;margin:auto}