.treeview-menu{max-height:0;overflow:hidden;transition:max-height .5s ease-out}.treeview.menu-open>.treeview-menu{max-height:500px;transition:max-height .5s ease-in}.treeview-menu li{opacity:0;transform:translateY(-20px);transition:opacity .5s ease-out,transform .5s ease-out}.treeview.menu-open .treeview-menu li{opacity:1;transform:translateY(0);transition:opacity .5s ease-in,transform .5s ease-in}