Add CSS after Conditional Styles

The module sets weight to 999. So in your drupal_add_css you should probably set weight to a higher value.

You can do something like this from your theme:

function mytheme_preprocess_html(&$vars) {
 
    //Add stylesheet after conditional stylesheets
    drupal_add_css(
           path_to_theme() . '/path/to/mystylesheet.css',
           array(
             'group' => CSS_THEME,  //Conditional styles has CSS_THEME, so we equal that weight
             'every_page' => TRUE,  //Conditional styles has TRUE, so we equal that weight
             'weight' => 9999, //Conditional styles module has 999, so it must be higher
             'preprocess' => FALSE //Disable CSS aggregation/compression for weights to take effect with conditionals
           )
         );

}

So actually conditional stylesheets are grouped with regular stylesheets. But because preprocessing has been disabled for conditionals, you have to do the same with your render-me-last stylesheet.

Log

I'm closing it because the issue was created a long time ago without any further steps.

if you still need it then raise a new one.
thanks