I am glad you found it helpful in some way. Yeah, getting rid of the ssr part if it's pure React, but the css variables approach makes it really easy to mantain and make changes. Although I'm not sure I'll always go with this approach in a regular react app, instead of just passing the theme by context down the component tree.
Thanks to you for actually reading the thing! Is nice to get upvotes and tips(and appreaciated btw) but having someone to actually read and find some value in what you share is really cool.