I find this style of "heavy dark borders/shadows" one of the ugliest recent trends on the web. It's rarely done well.

But otherwise the website looks pretty great. Vibe coded websites usually transmit the feeling of: "nobody even bothered to look at this", and that's not the case with yours at all.

In your lists where elements are separated by horizontal lines, I would remove the horizontal line after the last element. That's quite easy in CSS.