judge0/ide ? reverse-engineered prompt

Build me a simple online code editor that lets people write code in the browser and run it right away in a bunch of different languages.

I want it to feel lightweight and easy to use, more like a quick playground than a heavy IDE. The main job is to give the user a clean editor, let them pick a language, run their code, and see the output or errors clearly. It should be good for testing small snippets, learning, and teaching.

Make it work as a polished web app with a nice default layout, responsive design, and the usual basics like a shareable page, app icon, and offline friendly setup if that makes sense. Use the Judge0 execution API or something equivalent for running the code, and look up current docs online if you need to. Keep the whole thing free and open source friendly, and make it easy to extend later.