/* 标题+目录按钮横向容器 */
.title_wrap_box {
    display: flex;
    align-items: center;
    gap: 12px;
    position: relative;
    margin-bottom: 8px;
}
.article_titlebor {
    margin: 0;
    flex: 1;
}
/* 目录点击按钮 */
.catalog_btn {
    cursor: pointer;
    padding: 5px 10px;
    background: #f5f7fa;
    border: 1px solid #dddddd;
    border-radius: 4px;
    font-size: 14px;
    white-space: nowrap;
    user-select: none;
    transition: background-color 0.2s;
}
.catalog_btn:hover {
    background-color: #e9edf5;
}
/* 目录弹窗面板 默认隐藏 */
.catalog_box {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    width: 260px;
    max-height: 60vh;
    overflow-y: auto;
    background: #fff;
    border: 1px solid #e5e7eb;
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.09);
    border-radius: 6px;
    padding: 12px;
    z-index: 999;
    display: none;
}
/* 显示目录的激活类 */
.catalog_box.show {
    display: block;
}
.catalog_box h4 {
    font-size: 15px;
    margin: 0 0 10px;
    padding-bottom: 8px;
    border-bottom: 1px solid #eee;
}
.catalog_ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
.catalog_ul li {
    margin: 7px 0;
    line-height: 1.6;
}
.catalog_ul a {
    display: block;
    padding: 4px 6px;
    font-size: 14px;
    color: #333;
    text-decoration: none;
    border-radius: 3px;
    transition: all 0.2s;
}
.catalog_ul a:hover {
    background-color: #f0f6ff;
}
/* H1一级目录加粗 */
.catalog_ul a.level-1 {
    font-weight: 600;
}
/* H2二级目录缩进 */
.catalog_ul a.level-2 {
    padding-left: 18px;
    color: #666;
}
/* 滚动所在条目高亮 */
.catalog_ul a.active {
    background: #e8f3ff;
    color: #1677ff;
    border-left: 3px solid #1677ff;
}
/* 锚点滚动顶部留白，不会被导航遮挡 */
.innerright h1,
.innerright h2 {
    scroll-margin-top: 40px;
}

/* 移动端适配 宽度小于768px */
@media screen and (max-width: 768px) {
    .title_wrap_box {
        gap: 8px;
    }
    .catalog_btn {
        padding: 3px 6px;
        font-size: 12px;
        flex-shrink: 0;
    }
    .catalog_box {
        width: calc(100vw - 30px);
        left: auto;
        right: 0;
        max-height: 50vh;
    }
    .catalog_box h4 {
        font-size: 14px;
    }
    .catalog_ul a {
        font-size: 13px;
    }
}