body{font-family:Arial;margin:0;background:#f5f5f5;color:#333}
header{background:#111;color:#fff;padding:20px;text-align:center}
nav a{color:#fff;margin:0 12px;text-decoration:none;font-weight:bold}
nav a:hover{color:#ffd000}
.container{max-width:1200px;margin:auto;padding:40px}
.hero img{width:100%;display:none}
.hero img.active{display:block}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px}
.card{background:#fff;padding:20px;border-radius:6px;box-shadow:0 2px 8px rgba(0,0,0,0.15)}
.gallery img{width:100%;border-radius:6px}
footer{background:#111;color:#fff;text-align:center;padding:25px;margin-top:40px}
.title{text-align:center;margin-bottom:25px}
.cert img{width:100%;box-shadow:0 2px 8px rgba(0,0,0,0.25)}