Nice approach keeping it minimal. Tufte CSS is a solid choice for readability. Interesting that you went with BibTeX citations in markdown. How are you parsing those? custom remark plugin or something else? I've found the remark/rehype ecosystem handles most markdown extensions well but citations tend to need custom work.
Hey :) thank you! I'm honestly note sure as I did not write the code to handle this problem. I simply asked claude for what I wanted. Seems to work quite well though. Sorry about that.