Way back at the beginning of time, I had Calibre convert that azw3 over to epub. It tried its best to clean it up. For instance, those "style=" spans all got converted to class="calibre\d" spans. It also added the spacing back in and managed to split the chapters into their own files. But, the "front matter" pages didn't have any heading markers, so they got dumped into one file.
I was just amazed at the original azw3 when I went back to see what was originally there.
And, yep, I do have my own set of css classes that I bring into each book so I can re-format it.
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