body {margin:0;font-family:Arial;background:#111;color:white;}
header{text-align:center;padding:30px;background:black;color:#ffc107;}
.btn{display:inline-block;background:#ffc107;padding:10px 20px;color:black;text-decoration:none;margin-top:10px;}
.container{padding:30px;}
.grid{display:flex;gap:15px;flex-wrap:wrap;}
.card{background:#222;padding:20px;border-radius:10px;cursor:pointer;flex:1;text-align:center;}
.card:hover{background:#ffc107;color:black;}
.hidden{display:none;background:#222;margin-top:15px;padding:20px;border-radius:10px;}