Remove Text Shadow From Navigation Menu

I know premium themes aren’t supported, but this is more of a CSS question than anything (I think). As a precursor to this question, I should admit that I have very little experience with CSS and PHP. I’ve learned what I know through these support forums or trial and error.

I’m using a theme called DeepFocus and I’ve made several CSS changes to change the way the navigation menu looks. One of the changes I made was to make the drop-down sub-menus have a light text color with a dark background. However, I can’t, for the life of me figure out how to get rid of the text shadow on these sub-menu links. You can see what I’m talking about here:

http://www.johnsearsmedia.com/

If you rollover “Film”, you’ll see that “Cinematography” and “Editing” are both blurred and difficult to read. The same applies to every other drop-down menu.

I’ve done a control-F search through the stylesheet for every instance of “text-shadow”, and changed them all one at a time, but to no avail. I assumed it would be in the “ul.nav” section but I’ve added “text-shadow: 0px 0px 0px #000000;” to every little bracket and seen no change. I put that section of the style sheet in the following pastebin for convenience.

http://pastebin.com/qWNPcmtT

I’m beginning to question whether it’s even a text shadow or some other formatting characteristic.

Any thoughts?