mohit-ksahu/vui ? reverse-engineered prompt

Build me a lightweight, framework agnostic UI components library using plain HTML, CSS, and JavaScript.

I want a clean component showcase page that lets me browse and try out the components, with all the styles and behavior working without any external dependencies. The library should be easy to drop into a plain HTML project, but also work if someone wants to use it in React or Vue by just importing the files.

Make sure the components are driven by CSS variables so the look and feel is easy to customize, and include a dark mode that works nicely. I’d like the interactions to feel polished, like tabs or similar components switching state automatically once the script is loaded.

Please organize it so there is a source version and a minified production version I can include directly in a project. If you need to check current best practices for bundling or browser support, look up the latest docs online.