flebedev77/gswitch-3-unlocked-git ? reverse-engineered prompt

Build me a simple browser game site for G Switch 3 that loads and plays smoothly in the browser, with the main game centered on the page and easy to start right away.

I want it to feel like a real game portal page, with a clean landing screen, basic navigation, and support for mobile and desktop. Make sure the game can be embedded or opened from the main page, and keep it working even if people refresh or come back later. If anything needs current browser or deployment details, look up the latest docs online.

Also make the page handle common static site stuff like a favicon, manifest, offline or cached loading if that makes sense, and a simple fallback page if the game can’t load.