Links in tables and table headers (sortable columns) look bad because the css classes define a fixed font size for links.
I think this is wrong. PLT.C.1: "The entity [Anchor] should use the default classes when embedding anchor tags." I'm not a native English speaker, but I think "default" does not necessary imply that there must be one specification for all. I'd read it as "take the default from the environment", i.e. in a context where font-size is 24pt, anchors should use that size also. Therefore I think the size specification for links should be removed from styles.css:
/* font */
Now links links in column headers have the right size, but are barely readable because they are blue on dark blue. This can be fixed by adding: