body{font-family:Arial,sans-serif;margin:0} .site-header{background:#003366;color:#fff;padding:20px;text-align:center} .nav-menu{list-style:none;display:flex;gap:18px;justify-content:center;padding:0;margin:12px 0} .fade-in{opacity:0;transform:translateY(12px);transition:opacity .6s,transform .6s} .fade-in.visible{opacity:1;transform:translateY(0)} footer{background:#003366;color:#fff;text-align:center;padding:20px;margin-top:40px} .whatsapp-btn{position:fixed;right:18px;bottom:18px;background:#25D366;color:#fff;padding:12px 14px;border-radius:999px;text-decoration:none}