/* 二级分类下拉菜单样式 */
#pro .sidebar-menu {
    background: #fff;
    border-radius: 0;
    padding: 30px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 20px;
    overflow: hidden; /* 确保内容不会溢出侧边栏 */
    box-sizing: border-box;
    width: 100%;
}

#pro .sidebar-title {
    color: #2E357C;
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid #e9ecef;
}

/* 一级分类样式 */
#pro .nav-item {
    position: relative;
}

#pro .nav-link {
    color: #666;
    padding: 12px 0;
    border: none;
    font-size: 14px;
    transition: all 0.3s ease;
    margin: 0 -30px;
    padding-left: 30px;
    padding-right: 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-decoration: none;
}

#pro .nav-link:hover {
    background-color: #2E357C;
    color: #f8f9fa;
    font-weight: 600;
    text-decoration: none;
}

#pro .nav-link.active {
    color: #fff;
    background: #2E357C;
    font-weight: 600;
    border-radius: 0;
}

/* 一级分类带下拉箭头 */
#pro .nav-link.dropdown-toggle {
    position: relative;
}

#pro .nav-link.dropdown-toggle::after {
    content: '';
    display: inline-block;
    width: 0;
    height: 0;
    margin-left: auto;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 6px solid #666;
    transition: all 0.3s ease;
}

#pro .nav-link.dropdown-toggle:hover::after {
    border-top-color: #2E357C;
}

#pro .nav-link.dropdown-toggle.active::after {
    border-top-color: #fff;
}

#pro .nav-link.dropdown-toggle.expanded::after {
    transform: rotate(180deg);
}

/* 二级分类容器 */
#pro .submenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out;
    background: #f8f9fa;
    margin: 0 -30px; /* 恢复负margin让背景占满容器 */
    padding: 0;
    display: block;
    width: calc(100% + 60px); /* 补偿负margin */
    box-sizing: border-box;
}

#pro.submenu.expanded {
    max-height: 2000px; /* 大幅增加高度以确保显示所有内容 */
    overflow: hidden; /* 保持隐藏溢出内容，确保在容器内 */
}

/* 二级分类项目样式 */
#pro.submenu .nav-item {
    border-bottom: 1px solid #e9ecef;
    width: 100%;
    flex-shrink: 0; /* 防止项目压缩 */
}

#pro .submenu .nav-item:last-child {
    border-bottom: none;
}

#pro .submenu .nav-link {
    color: #555;
    padding: 10px 30px 10px 50px; /* 恢复原始内边距以适应负margin */
    font-size: 14px;
    background: transparent;
    position: relative;
    display: block;
    width: 100%;
    white-space: nowrap; /* 防止文字换行 */
    overflow: hidden;
    text-overflow: ellipsis; /* 超长文字显示省略号 */
    box-sizing: border-box; /* 确保内边距包含在宽度内 */
    margin: 0;
    transition: all 0.3s ease;
}

#pro .submenu .nav-link::before {
    content: '';
    position: absolute;
    left: 35px; /* 恢复原始位置适应50px左边距 */
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 1px;
    background: #999;
}

#pro .submenu .nav-link:hover {
    color: #2E357C;
    background: #e9ecef;
    font-weight: 500;
}

#pro .submenu .nav-link.active {
    color: #2E357C;
    background: #e9ecef;
    font-weight: 500;
}

/* 侧边栏联系信息样式 */
#pro .sidebar-contact-info {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #e9ecef;
    text-align: left;
    display: block;
}

#pro .sidebar-contact-info h5 {
    color: #2E357C;
    font-size: 16px;
    margin-bottom: 15px;
    display: block;
    line-height: 1.2;
    text-align: left;
    width: 100%;
}

#pro .sidebar-contact-info p {
    color: #666;
    margin: 8px 0;
    font-size: 14px;
    display: block;
    line-height: 1.4;
}

/* 响应式设计 */
@media (max-width: 991px) {
    #pro .sidebar-menu {
        position: static;
        margin-bottom: 30px;
    }
}

@media (max-width: 768px) {
    #pro .sidebar-menu {
        padding: 20px;
        overflow: hidden;
    }
    
    #pro .nav-link {
        margin: 0 -20px;
        padding-left: 20px;
        padding-right: 20px;
        box-sizing: border-box;
    }
    
    #pro .submenu {
        margin: 0 -20px; /* 负margin让背景占满容器 */
        padding: 0;
        width: calc(100% + 40px);
    }
    
    #pro .submenu .nav-link {
        padding: 10px 20px 10px 40px; /* 适应负margin的内边距 */
        box-sizing: border-box;
    }
    
    #pro.submenu .nav-link::before {
        left: 25px;
    }
}

@media (max-width: 576px) {
    #pro .sidebar-menu {
        padding: 15px;
        overflow: hidden;
    }
    
    #pro .nav-link {
        margin: 0 -15px;
        padding-left: 15px;
        padding-right: 15px;
        box-sizing: border-box;
    }
    
    #pro .submenu {
        margin: 0 -15px; /* 负margin让背景占满容器 */
        padding: 0;
        width: calc(100% + 30px);
    }
    
    #pro .submenu .nav-link {
        padding: 10px 15px 10px 35px; /* 适应负margin的内边距 */
        box-sizing: border-box;
    }
    
    #pro .submenu .nav-link::before {
        left: 20px;
    }
}