gabrielecirulli/2048 ? reverse-engineered prompt

Build me a web version of the 2048 game that I can play in my browser. I want it to look and feel like the classic 2048 puzzle, where I slide numbered tiles to combine them and try to reach the 2048 tile. The interface should be simple and responsive, letting me use keyboard arrows on desktop or swipe gestures on mobile to move the tiles. Make sure the game keeps track of my best score and shows a game over message if I lose. I want to be able to play this without installing anything. If you need help on shaping the UI or logic, feel free to look up references or current docs online.