Introduction I found that lots of excellent DESIGN.md examples are already available in this awesome repo: https://github.com/VoltAgent/awesome-design-md Light introduction: this repository is a curated collection of ready-to-use DESIGN.md files extracted from real websites, designed to help AI agents generate UI with better visual consistency. Big credit to the maintainers and contributors of awesome-design-md for pushing this direction forward and making design-system knowledge easier to reuse. That said, sometimes I want to build something not included in the repository. Especially when I am in an old-school mood and want a retro flavor that is uniquely mine. ;) So in this tutorial, we build a fun experiment: a custom DESIGN.md generator app in C#. The app will: Crawl a target page. Extract visual tokens (colors, fonts, semantic classes). Ask LLM to synthesize a full DESIGN.md . Ask LLM to generate a verification index.html from that DESIGN.md . Save both files locally.…