Zoxu4K/FNGetKey — reverse-engineered prompt

Build me a small website called FNGetKey. I need a clean landing page where someone can open the site, press a button, and get shown a key or access code, with clear instructions and a copy button.

I also need a simple admin page for me to update the key, see the current value, and reset it. Keep it lightweight, just HTML, CSS, and simple JavaScript if needed, since this should be easy to host as static files.

Make it look decent on phone and desktop, with a dark gaming style, simple status messages, and no confusing setup. If proper password protection needs a backend, don’t fake security, just add a clear placeholder or basic local admin flow for now.

Please create the pages and connect everything so I can open index.html and admin.html and test it right away.