/* styles.css */
body {
    margin: 0;
    padding: 0;
    background-color: #333; /* 深灰色背景 */
    display: flex;
    flex-direction: column;
    align-items: center;
}

.background-image {
    position: relative;
    width: 100%;
    height: 300px; /* 背景图高度 */
    background-image: linear-gradient(rgba(51, 51, 51, 0), rgba(51, 51, 51, 1)), url('bg.webp'); /* 渐变背景 */
    background-size: cover;
    background-position: center;
    display: flex;
    justify-content: center;
    align-items: center;
}

header {
    color: white;
    font-size: 2em;
    text-align: center;
    z-index: 1;
    position: relative;
}

.subsites {
    display: flex;
    flex-wrap: wrap; /* 多行布局 */
    justify-content: space-around;
    width: 100%;
    padding: 20px 0;
    background-color: #333; /* 深灰色背景 */
    min-height: 600px; /* 增加最小高度 */
}

.subsite {
    text-align: center;
    margin-bottom: 20px;
}

.subsite img {
    width: 100px; /* 图标大小可以根据实际调整 */
    height: auto;
}

.subsite a {
    color: white;
    text-decoration: none;
    font-size: 1.2em;
    display: block;
    margin-top: 10px;
}

.description {
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
    padding: 20px;
    max-width: 800px;
    text-align: center;
    color: white;
    background-color: #333; /* 初始背景颜色 */
}

.description.visible {
    opacity: 1;
}