Three ways to make the chat the page.
Each layout keeps the same vehicle check: one free answer, the rest behind the account, and the live model selector. The homepage itself is unchanged until you pick one.
Stage
The looping bay video stays behind a full-viewport chat. The headline is one line. The thread and the question box take the rest of the screen.
World
A single Three.js service bay. Scroll moves the camera from the door, under the lift, through the complaint field, to the recall wall. The chat stays large and fixed beside the story.
Deck
A dark, edge-to-edge chat the height of the screen, with larger type and a wide composer. The film clips sit below the fold and play only when they scroll into view.