Thank you - I don't think I explicitly state this anywhere on the website - but all the different themes were made by Claude Code with Dreamtap providing different sources of inspiration - I wasn't involved in designing them at all.
Notably, GPT-5-Codex is significantly worse at this, it has a much stronger drive to make one specific style of website.
Your website gave me a vibe coded impression, but I thought I was being overly paranoid. I'm glad you confirmed it, it seems the clues that give that feeling have some grounds in reality.
It's very interesting how current IAs seems to generate simplistic websites with similar quirks on the first iteration. I guess it's intentional since simple is a good start point.