That's due to a styling you added in
Common.css:
/******** Link colour ********/
a {
color: #5f1023 !important;
}
Removing it should fix the issue. If you want to change the link color, then you should do it through
ThemeDesigner. That wouldn't bring unexpected results.
Unrelated, but why do you have the CSS on both Common.css and Wikia.css? You should limit it to one page only; otherwise it's clogging up unnecessary space and can also bring about headache in maintenance. I'd suggest keeping the CSS to Wikia.css only, as it's more of conventional.