coan.net: Css is like a big bunch of IFs. "If a tag has id something render it like this" or "if a tag <xxx> has a child <yyy> render it so and so"

What you'r probably like are more selectors. Some that would let you select according to the text inside the tags... But that doesn't exist.

AbigailII's suggestion about an extra element identifying the page subject seems like the best way togo. But of course,that's work for Fencer not you