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Reducing nav links to breadcrumb of current page and dropdown in mobile devices

Currently struggling to find a solution for reducing a desktop navbar with 3 main links to a mobile navbar (tablet and below) to show only the current page as a sort of breadcrumb.

Current desktop nav:

How I am trying to get it to look/behave on tablet and below:

The idea is then the page after the ‘>’ is whatever the current page is. When you click on it, you see a dropdown with the other pages.

I can do the reduction of the logo-name and chevron with showing/hiding the elements, but struggling with knowing what to search for help with showing only the current page and a dropdown of only the other pages (not all pages).

Here is my site Read-Only: