[Evil Overlord]

Thanks. Still a bit confused, though.

GIGO

So, paste into Word, spell check and edit, paste back into Sigil, apply headings by hand is a best case? Or paste in LibreOffice, export as EPUB, refine with Sigil?

Arnold from Webwrites (older Baen Webscriptsions), used a simple Stylesheet with ~50 lines that covered most simple cases nicely.

I'll see if I can dig it up rather than make my own (though I've learned something about CSS, anyway).

They already are All the default styles in the stylesheet are shown here:
( there are no defaults)

For me, Sigil offers Normal, and Heading 1-6, even in new documents. However, the headings don't seem to actually do anything until defined. I assume "normal" just applies the "body" format?

There are None built in.
Sigil constructs SGC-# styles in line as used. the same code does not apply to all pages (unless you perform exactly the same styling operations in exactly the same order )
All SGC-4 means is: that it was the 4th combination of styling used upon that page.

I stole the "built-in Sigil CSS definitions" language from an older forum response. Thanks for explaining the SGC #, though. Very informative.

The Sigil buttons seem to be the only way of applying italic, correct? I've tried including it in the style definitions, but it didn't work (though other things did). I seem to recall seeing a note on this in passing, but haven't tracked it down yet.