If they showed the actual css, people could just ... copy it, and then how could they charge for the secret golden ratio code lol

There is that, but I get the impression that you could hire an expert to help.

I clicked on Dropdown, thinking it's one of the more complex things to implement. It doesn't even have a picture.

And one that drops frames when I scroll through on Firefox.

Yes, I too felt that way as I began to read, it was an immediate disappointment, kind of, that the UI wasn’t on full display, front and center.

I wouldn’t trust a framework that requires me to involve myself with JavaScript, nextJS, and React, also… but I am generally of the opinion that a framework pitching itself as a UI kit, must pretty much not be a plugin for a web browser…