I'd like the navlinks (preset elements of the navbar) to have an "Open state" class, just like the hamburger menu button, so as to be able to style them specifically for the hamburger button open state.
What do you mean?
The buttons themselves can't be "open", and they can't be seen unless the hamburger button is open, so they don't have different states for that either.
If you want the button style to be different between desktop and tablet/mobile you can just style them at said breakpoints.
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