/* 搜索框宽度控制 */
@media (max-width: 767.98px) {
    form.dropdown-menu{
        width: 100% !important;
    }
}
@media (min-width: 768px) {
    form.dropdown-menu{
        width: 600px !important;
    }
}


 


.nav-item .nav-link   {
    border-bottom: 5px solid transparent;
    transition: border-color 0.5s;
}

.nav-item .nav-link:hover ,   .nav-link.active  {
    border-bottom-color: orange;
}