body.dark{background:#0f1115;color:#e0e0e0;font-family:Arial}
header{text-align:center;padding:20px;background:#000}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px;padding:24px}
.card{background:#1a1d23;border-radius:12px;overflow:hidden}
.card img{width:100%;height:220px;object-fit:cover}
.txt{padding:14px}
.cert{font-size:12px;color:#9aa}
.main-img{max-width:420px}
input,button{width:100%;margin:6px 0;padding:10px}
button{background:#4da3ff;border:none;color:#000}
a{color:#4da3ff;text-decoration:none}
.wa{position:fixed;bottom:20px;right:20px;background:#25D366;color:#fff;padding:14px 18px;border-radius:30px}