Style.css doesn’t control link display??

I just started using a new theme, Tiga. I couldn’t figure out how to use the configurator, so I edited the syle.css file to make some changes.

I can’t find a way to control the color of the links (including rollover), the background of the rollover for the menu bar items, or the colors for the comments.

The links have an underline, so I searched the .css file for that word thinking that would show me what lines to edit, but it doesn’t appear anywhere.

Where else would the controls for those three options be hiding if not in the style.css?

Also, some of the text colors I set in the .css file seem to be ignored. For example, the change I made in the size of the header text goes according to what I entered, but the color of the text doesn’t.

Any help would be most appreciated!