Astro Theme Pure is a blog and documentation theme for the Astro static site generator. It provides a comprehensive set of UI components, layouts, and integrations (comment systems, search, SEO) to build content-driven websites. The theme is structured as an Astro integration (`packages/pure/index.ts`) that consumes user configuration from `src/site.config.ts` and enhances Astro's content collections with plugins for markdown processing (reading time, image zoom, tabs, steps). It features a UnoCSS-based styling system, dark/light theme switching, and optional integrations like Waline for comments and Pagefind for search. The architecture emphasizes slot-based composition, utility-first styling, and virtual module injection for build-time configuration.