Thank you for your answer,
But it seems that this approach works with known levels of hierarchy, or am I wrong?
I've tried your sample with 4 levels deep and it seems that I can navigate only to 2nd level, also 1th level has different style than 2nd
Our customer what to have next:
on navigation level back button (<-) + trimmed text if not fit a size
on items level (from 1th - N deep level) - text with wrap
the deep level is unknown (something like table of content for a book with sub levels)
Thanks