I make the CSS files myself & I have a standard entry:
Code:
a:link { color: #663300; text-decoration: none; }
KindleGen keeps the color in conversion. but whatever I have tried in Calibre, like convert MOBI to MOBI with S&R :Search: color="blue"; Replace:color="red", etc. - the result is the same: links are blue.
If the chapter heading is red & a part of it is a link to TOC, the style is ruined.
And i don't have any ereader - i read on my PC with either Mobipocket or Kindle apps.