gbclasses8-ui/APP ? reverse-engineered prompt

Build me a simple web app that uses my Gemini API key and works locally right away.

I want a clean, responsive interface where I can enter a prompt, send it to the AI, and see the response clearly on screen. Make it easy to run with the existing local setup, use the env file for the API key, and keep the experience polished and simple. If you need to check the latest Gemini docs online, go for it.

Please make sure it feels like a real finished app, not just a rough demo, with sensible loading and error handling, and a nice layout that works on desktop and mobile.