Sorry, I’d missed that. You can use the asset directory if you’re going to be processing assets (e.g. from scss to css). The static directory works for non-processed assets (its contents are copied straight to /public). However, not if it’s within your layouts folder.
/themes/mytheme/static/css/section_number.css will work. /themes/mytheme/layouts/static/css/section_number.css won’t.
Oops, it was a key in mistake, in fact I do have mytheme/static/css, but this do not work, I have to move the css to assets, mean while, mytheme/static/js works. Realy have no idea.
Well, I’m glad you got it working…but it should work in mytheme/static/css. (If you want it to work in static, feel free to post a link to your git repository, and someone might be able to see what’s gone wrong.)