body {
    font-family: Arial, sans-serif;
    margin: 20px;
}

h1 {
    color: #333;
    text-align: center;
}

.category {
    margin-bottom: 30px;
}

.category h2 {
    background-color: #f4f4f4;
    padding: 10px;
    border-left: 5px solid #0078d7;
    margin-bottom: 15px;
}

.site-container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.site {
    position: relative;
    display: inline-block;
    padding: 10px;
    background-color: #f9f9f9;
    border: 1px solid #ddd;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.site:hover {
    background-color: #e0e0e0;
}

.site h3 {
    margin: 0;
    color: #0078d7;
}

.links-popup {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #fff;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    padding: 10px;
    z-index: 10;
    min-width: 200px;
}

.site:hover .links-popup {
    display: block;
}

.links-popup a {
    display: block;
    padding: 5px 10px;
    text-decoration: none;
    color: #333;
    transition: background-color 0.3s;
}

.links-popup a:hover {
    background-color: #f0f0f0;
}

/* 移动设备适配 */
@media (max-width: 768px) {
    .site:hover .links-popup {
        display: none;
    }

    .site.active .links-popup {
        display: block;
    }
}