body {
    font-family: 'Microsoft YaHei', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f2f5;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 20px auto;
    padding: 0 20px;
}

.category-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.category {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
    overflow: hidden;
    z-index: 1; /* 设置较低的 z-index */
}

.category-header {
    background-color: #f8f9fa;
    padding: 15px 20px;
    border-bottom: 1px solid #e8e8e8;
}

.category-header h2 {
    margin: 0;
    font-size: 18px;
    font-weight: 600;
}

.site-list {
    display: flex;
    flex-wrap: wrap;
    padding: 15px;
    gap: 10px;
    /* 确保不限制子元素显示 */
    overflow: visible; 
}

.site-item {
    flex: 1 1 calc(33.333% - 10px);
    min-width: 100px;
    /* 确保不限制子元素显示 */
    overflow: visible; 
    position: relative;
}

.site-item a {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 12px;
    text-align: center;
    border-radius: 4px;
    text-decoration: none;
    color: #333;
    transition: all 0.3s;
    position: relative;
    /* 设置一个较高的 z-index */
    z-index: 1; 
}

.site-item a:hover {
    background-color: #f0f2f5;
    color: #1890ff;
}

.site-icon {
    width: 32px;
    height: 32px;
    margin-bottom: 8px;
    display: block;
    margin: 0 auto; /* 图标居中 */
}

.site-name {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 4px;
    display: block;
    text-align: center; /* 名称居中 */
}

.short-description {
    font-size: 12px;
    color: #666;
    margin: 0;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    display: block;
    text-align: center; /* 短描述居中 */
}

/* 默认隐藏 tooltip */
.tooltip {
    position: absolute; /* 改为 absolute 定位 */
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 5px 10px;
    border-radius: 4px;
    font-size: 14px;
    z-index: 1000; /* 初始 z-index */
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.1s, visibility 0.1s;
    max-width: 200px;
    pointer-events: none;
}

.site-item a {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 12px;
    text-align: center;
    border-radius: 4px;
    text-decoration: none;
    color: #333;
    transition: all 0.3s;
    z-index: 1; 
}

/* 鼠标悬停时立即显示 tooltip */
.site-item a:hover .tooltip {
    opacity: 1;
    visibility: visible;
}

.site-item a:hover .tooltip {
    display: block;
}

@media (max-width: 768px) {
    .container {
        padding: 0 10px;
    }
    .category-container {
        grid-template-columns: 1fr;
    }
    .site-item {
        flex: 1 1 calc(50% - 10px);
    }
}


.footer {
    margin-top: 40px;
    padding: 20px 0;
    background-color: #fff;
    border-top: 1px solid #e8e8e8;
    text-align: center;
}

.friend-links {
    margin-bottom: 10px;
}

.friend-links-label {
    margin-right: 10px;
    font-weight: bold;
    color: #333;
}

.friend-links a {
    margin: 0 10px;
    color: #333;
    text-decoration: none;
    transition: color 0.3s;
}

.friend-links a:hover {
    color: #1890ff;
}

.copyright {
    font-size: 12px;
    color: #666;
}