.neirong {
    width: 1400px;
    min-height: 500px;
    background-color: #f8f8f8;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    gap: 20px;
}

.left-sidebar {
    width: 300px;
    background-color: white;
}

.tree-menu {
    list-style: none;
    padding: 0;
    margin: 0;
    width: 300px;
}

.tree-item {
    position: relative;
}

.tree-link {
    display: block;
    width: 245px;
    height: 40px;
    line-height: 40px;
    padding-left: 20px;
    font-size: 16px;
    color: #333;
    text-decoration: none;
    margin: 0 auto;
    transition: background-color 0.5s, color 0.1s;
    cursor: pointer;
    position: relative;
}

.tree-link::after {
    content: none;
}

.tree-item:has(.tree-child)>.tree-link::after {
    content: '';
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-top: 6px solid #999;
    transition: transform 0.3s ease;
}

.tree-item.active:has(.tree-child)>.tree-link::after {
    transform: translateY(-50%) rotate(180deg);
}

.tree-link:hover {
    background-color: #E6F7FF;
    color: #1a73e8;
}

.tree-item.active>.tree-link {
    color: #1a73e8;
    font-weight: bold;
    background-color: #E6F7FF;
}

.tree-item.active>.tree-link:hover {
    background-color: #E6F7FF;
    color: #1a73e8;
}

.tree-child {
    list-style: none;
    padding: 0;
    margin: 0;
    max-height: 500px;
    overflow: hidden;
    transition: max-height 0.5s ease;
}

.tree-item:not(.active)>.tree-child {
    max-height: 0;
}

.tree-child li {
    position: relative;
}

.tree-child-link {
    display: block;
    width: 245px;
    height: 40px;
    line-height: 40px;
    padding-left: 45px;
    font-size: 16px;
    color: #333;
    text-decoration: none;
    margin: 0 auto;
    transition: background-color 0.5s, color 0.1s;
    cursor: pointer;
}

.tree-child-link:hover {
    background-color: #E6F7FF;
    color: #1a73e8;
}

.right-content {
    width: 1080px;
    background-color: white;
    display: flex;
    flex-direction: column;
}

.content-header {
    height: 50px;
    width: 1080px;
    display: flex;
    align-items: center;
    padding-left: 20px;
    border-bottom: 1px solid #eee;
}

.breadcrumbs {
    font-size: 14px;
    color: #666;
}

.content-body {
    width: 1080px;
    min-height: 600px;
    line-height:2;
}

.content-body a{
color:#3A8BFF;
text-decoration: underline;
}
.content-body a:hover { 
cursor: pointer;

}