body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #fff;
    color: #222;
}
.container {
    max-width: 900px;
    margin: auto;
    padding: 40px 20px;
}
h1 {
    font-size: 32px;
    margin-bottom: 10px;
}
.grid {
    margin-top: 30px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
}
.card {
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 10px;
    text-align: center;
    text-decoration: none;
    color: #222;
    transition: 0.2s;
}
.card:hover {
    background: #f5f5f5;
}
.disabled {
    opacity: 0.5;
}
.back {
    display: inline-block;
    margin-top: 20px;
    text-decoration: none;
    color: #0066ff;
}