css bluebreeze/style.css overwrites bluebreeze-fixed/style.css

As pointed out at CSS Compressor: Error with @import in style.css
@import is not handled correctly by drupal 5's css compressor.

so we have to avoid @import in our code
and - a little bit more complicated - we need to add the bluebreeze/layout.css and bluebreeze/style.css before bluebreeze-fixed/style.css into $vars['css']