[DNSB]

Last time I edited an ebook with over 100 stylesheets, they were identical and short. All the real styling was done using a mix of styles declared at the start of each text file and inline styles.

Here's what there were 173 stylesheets worth of:

@page {
  padding: 0pt;
  margin: 0pt;
}

body {
  text-align: justify;
  padding: 0pt;
  margin: 0pt;
}