/* 左侧导航样式 - 参考菜鸟教程 */

/* 左侧导航容器 */
.left-nav {
    background-color: #f9f9f9;
    border-right: 1px solid #e9e9e9;
    padding: 0;
    position: sticky;
    top: 70px;
    height: calc(100vh - 70px);
    overflow-y: auto;
}

/* 左侧导航标题 */
.left-nav .sidebar-title {
    background-color: #96b97d;
    color: white;
    padding: 10px 15px;
    font-size: 16px;
    font-weight: 500;
    margin: 0;
}

/* 左侧导航列表 */
.left-nav .sidebar-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

/* 左侧导航项 */
.left-nav .sidebar-menu li {
    border-bottom: 1px solid #e9e9e9;
    margin: 0;
    padding: 0;
}

.left-nav .sidebar-menu li:last-child {
    border-bottom: none;
}

/* 左侧导航链接 */
.left-nav .sidebar-menu li a {
    display: block;
    padding: 10px 15px;
    color: #333;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s;
}

.left-nav .sidebar-menu li a:hover {
    background-color: #f1f1f1;
    color: #96b97d;
}

/* 当前激活项 */
.left-nav .sidebar-menu li.active a {
    background-color: #e8f5e9;
    color: #96b97d;
    border-left: 3px solid #96b97d;
    font-weight: 500;
}

/* 分类标题 */
.left-nav .category-title {
    background-color: #e8f5e9;
    color: #96b97d;
    padding: 10px 15px;
    font-size: 15px;
    font-weight: 500;
    margin: 0;
    border-bottom: 1px solid #e9e9e9;
}

/* 子分类列表 */
.left-nav .subcategory-menu {
    list-style: none;
    padding: 0;
    margin: 0;
    background-color: #fff;
}

/* 子分类项 */
.left-nav .subcategory-menu li {
    border-bottom: 1px solid #f1f1f1;
    margin: 0;
    padding: 0;
}

/* 子分类链接 */
.left-nav .subcategory-menu li a {
    display: block;
    padding: 8px 15px 8px 25px;
    color: #555;
    text-decoration: none;
    font-size: 13px;
    transition: all 0.2s;
}

.left-nav .subcategory-menu li a:hover {
    background-color: #f9f9f9;
    color: #96b97d;
}

/* 当前激活子分类 */
.left-nav .subcategory-menu li.active a {
    background-color: #f9f9f9;
    color: #96b97d;
    border-left: 3px solid #96b97d;
    padding-left: 22px;
    font-weight: 500;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .left-nav {
        position: static;
        height: auto;
        margin-bottom: 20px;
    }
}