How to make a low-fi wireframe for an SPA?

I am remaking a website with 14 pages to be a single page app.
It is for tracking work hours across projects.
But I am stuck designing a low-fi wireframe, and could really use some help.

  1. How do I know my design will fit on mobile if I don't make my wireframe somewhat detailed?
  2. How do I communicate the meaning of my design through gray boxes?
  3. How to go about drawing a static image of something that is so incredibly flexible?
There are 3 types of users that are shown a different UI and content.
There are 2 media queries for tablet and laptop that change the lay-out.

This feels like trying to capture a movie in 1 frame.
1.jpg
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