Nowadays what they tend to do in 100% low floor trams is have the majority of the bogie under the floor purely consisting of a structural U frame, all the gubbins are on the extreme edges surrounding the wheels. So floor height is actually below the height of the bogie edges and your walking through the centre of the bogie.
This Russian bogie is a good example.
https://www.metro-report.com/uploads/pics/tn_uvz-r1-tram-bogie-impression.jpg
Or this CAD model.
https://d2t1xqejof9utc.cloudfront.net/screenshots/pics/aed489ab46e2a00320cfb8b68da5ec9b/large.JPG