needle-engine/needle-engine-bike-scrollytelling ? reverse-engineered prompt

Build me a scrolling story website about a bike ride, where the scene moves and reacts as I scroll down the page.

I want a polished landing page with a 3D bike scene that follows the scroll, with smooth camera moves, animated parts, and a few different moments in the story as the user keeps scrolling. It should feel like a modern scrollytelling demo, with the content on the page driving the animation in the scene. If it helps, use the current docs online for the best way to set up the scrolling and viewport behavior.

Make it so I can run it locally, open it in the browser, and tweak the animation in the editor or scene setup and see those changes reflected right away. Keep the visuals clean and cinematic, and make the whole thing easy to understand and extend later.