Master Page and folders

[nxr]

I have a website with one Master_Page and a large number of subpages sorted in separate folders.
Master_Page includes Header with "Responsive Menu" and Footer with "CSS Menu".
Main Menu ( "Responsive Menu" in Header ) work properly on all subpages, but links in Footer ( "CSS Menu" ) not working properly.

I read another post with a similar problem with an explanation that "the Master Page must be in the same folder otherwise links will not be valid".
With a large number of pages, "Master Page" is a really great option and I would like to stay with it.
...how to easily find a solution without absolute links ?

By the way: how "Responsive Menu" in Header work properly on all subpages, but CSS Menu in footer not ?

[Pablo]

The master page must be in the same folder because (internal) links are relative to the current folder, so if the content page is in another folder then the links will not be valid.