How to overriding specific Omega_Kickstart CSS files in a subtheme? I'm using Commerce Kickstart (Version 2).

I created a new theme, which is basically a copy of the commerce_kickstart_theme. So it's a subtheme of omega_kickstart which is, itself, a subtheme of omega v3.

Even though the child theme has various css files for global, narrow, normal, it -looks- as though the theme actually reads in the css from the parent theme... ie. the OMEGA and is ignoring same-named files in my subtheme.

Eg. if I have a file global.css in my subtheme, it is ignored and the omega_kickstart/global.css is used instead. 

The same goes for the various alpha files. Eg. I copied alpha-mobile.css into my theme folder. But the file being @imported is the /omega/alpha/css/alpha-mobile.css.

My understanding is that if a same-named css file was in your theme directory it -replaced- the file from the parent. But that doesn't seem to be happening.

Any ideas?
A few things you may want to check (since none of these items are incuded in the question):


make sure you cleared the cache (if not that explains what you experienced).
make sure the file permissions are correct (if not the webserver will not be aware of the newly created subtheme).
make sure you enabled the sub-theme (only creating it is not sufficient).