This repository is a comprehensive, non-official Chinese-language guide to OpenAI's Codex and ChatGPT products, titled 'ChatGPT 橙皮书' (Orange Book). It is primarily a documentation project that produces a static website and a downloadable PDF from a single Markdown source file. The production system is a static site hosted on GitHub Pages, providing an online reading experience with a table of contents, scroll progress tracking, and PDF download. The build pipeline consists of Python scripts that convert Markdown to HTML (build_site.py) and to PDF via headless Chrome (build_pdf.py), with image optimization and cover page support. The repository also includes a CI/CD workflow for deployment. While not a traditional software application, it functions as a documentation-as-code system with reusable build tooling and well-crafted front-end assets.