Hope following links will help you.
Thanks & Regards
MS Web Designer Team
Official Shopify Expert and Partner
Liquid CSS files do support Liquid (makes sense when you say it out loud) but you won't get the full suite of objects and functions.
This is a 5 second test, but can say that the shop object isn't available so you won't be able to pull that name property.
If it's super important to have the css pull the name you'll need to inline the CSS into a template file instead.