I have my child theme of TwentyEleven setup. I can't make any tweaks to the dark version of my child theme of TwentyEleven. I don't really want to mess with my functions.php to create an additional custom css file. I like how WP child themes work and making changes to the child themes style.css file for theme tweaks. Is there a way to have a child version of dark.css with my child theme to edit my changes? Did someone forget that we would want to use TwentyEleven/Dark and tweak it from a CSS file?