/* css/xx.css */

/* 学习历程页面的容器 */
.xx-container {
    width: 90%;
    max-width: 1200px;
    margin: 20px auto;
}

.xx-content {
    background-color: rgba(51, 51, 51, 1);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.xx-content h1 {
    color: #CCCCCC;
    font-size: 28px;
    margin-bottom: 20px;
    border-bottom: 2px solid #CCCCCC;
    padding-bottom: 10px;
}

/* 树状目录样式 */
.xx-content ul {
    list-style-type: none;
    padding-left: 0;
    margin: 0;
}

.xx-content li.xx-directory {
    margin: 10px 0;
    position: relative;
}

/* 展开/收缩按钮 */
.xx-content .xx-toggle-button {
    cursor: pointer;
    display: inline-block;
    width: 20px;
    text-align: center;
    margin-right: 5px;
    color: #CCCCCC;
    font-size: 14px;
    transition: color 0.3s;
}

.xx-content .xx-toggle-button:hover {
    color: #F9D938;
}

.xx-content .xx-toggle-button i {
    pointer-events: none; /* 确保图标不响应点击事件 */
}

/* 目录名称 */
.xx-content .xx-directory-name {
    font-size: 18px;
    font-weight: bold;
    color: #CCCCCC;
    cursor: pointer;
    transition: color 0.3s;
}

.xx-content .xx-directory-name:hover {
    color: #F9D938;
}

/* 子内容容器（子目录和文章） */
.xx-content .xx-sub-content {
    margin-left: 25px;
    border-left: 2px solid #CCCCCC;
    padding-left: 10px;
    overflow: hidden;
    max-height: 0;
    opacity: 0;
    transition: max-height 0.3s ease, opacity 0.3s ease;
}

/* 显示子内容 */
.xx-content .xx-sub-content.show {
    max-height: 1000px; /* 确保足够大以容纳内容 */
    opacity: 1;
}

/* 文章列表样式 */
.xx-content ul.xx-articles {
    margin-top: 10px;
}

.xx-content li.xx-article {
    margin: 5px 0;
    position: relative;
}

/* 文章项目符号 */
.xx-content li.xx-article::before {
    position: absolute;
    left: -25px;
    top: 0;
    content: '•'; /* 添加项目符号 */
    color: #CCCCCC;
    font-size: 16px;
}

/* 文章链接 */
.xx-content li.xx-article a {
    text-decoration: none;
    color: #555;
    transition: color 0.3s;
}

.xx-content li.xx-article a:hover {
    color: #CCCCCC;
}

.beijin{
    background-color: transparent;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .xx-container {
        width: 95%;
    }

    .xx-content h1 {
        font-size: 24px;
    }

    .xx-content .xx-directory-name {
        font-size: 16px;
    }

    .xx-content .xx-toggle-button {
        width: 18px;
    }

    .xx-content li.xx-article::before {
        left: -20px;
        font-size: 14px;
    }
}