[azindex] Category specific coloring on index pages?

This seems like a simple thing to do, but I can’t get it figured out. I would like the title color of posts be dependent on which category they are in.

For example, post 1 is in category a; so the title should be green. Post 2 is in category b, so the title color should be red.
Is this possible? What am I missing here? This is what I have to get it working for everything but my azindex pages. Can someone point me in the right direction please?

.category-stingers .entry-title a { color:green; }
.category-non-stingers .entry-title a { color:red; }
.category-unknown .entry-title a { color:orange; }

Thanks!