FYI, I got this to partially work by adding:
@import url('../rsw/style_dark.css');
… to my child theme style.css, and also by changing line 50 in the header.php copy in my child theme folder from:
<link rel="stylesheet" type="text/css" href="<?php echo get_template_directory_uri(); ?>/css/dynamic_css.php"/>
to:
<link rel="stylesheet" type="text/css" href="<?php echo get_stylesheet_directory_uri(); ?>/css/dynamic_css.php"/>
Hope this helps!
Cheers
