Very cool site! It's got some Claude-isms but they're not overwhelming which leads me to wonder: how did the author get the overall aesthetic to be so un-Claude-like?
V1 looked like complete Opus slop, but since I make many little sites all the time I can get it to undo a lot of them, one at a time. I just explicitly tell it the aesthetic to avoid per-element (like the famous left border), and eventually it looks okish.
Edit: Ah and for text, Standard Technical English is a good instruction to give it, but I also told it to be dry and technical, and no embelish or do storytelling. And some manual editing out of cringe stuff still after that.