I think 383toast is talking about your landing page design which has very strong AI-generated design vibes (blue-green gradients, rounded rectangles with a colored border on the left...)
There are a bunch of skills you can find online to improve on this if you want to keep designing with Claude, and the latest generation of models are better (Fable/GPT5.6).
I got the same vibes. I really wish YCombinator would mentor startups on design. Unfortunately, most of the landing pages in their startup directory look like raw AI designs.