scroll-film — the camera moves, the scroll is the playhead

The page plays nothing. It holds a chain of pre-rendered clips and maps the scroll position to their playhead, so the visitor flies through scenes — outside a building, inside it, on to the next — without a cut. Three parts must be right, and each fails in its own way: the chain (seams), the encode (seeking) and the page (phones). This skill owns all three.

Not this skill — delegate:

• Scroll-linked reveals, parallax, pinned sections, a horizontal pan, with no video → ../design/SKILL.md.
• A finished MP4 with voice and music → ../ai-media/SKILL.md.
• The call to the model endpoint (queue, webhooks, cost per call) → ../fal/SKILL.md or ../replicate/SKILL.md.
• The scene stills themselves → ../replicate-images/SKILL.md.
• The words over the film → ../landing-copy/SKILL.md. A video rendered from code → ../remotion-video/SKILL.md.

1. The gate: nothing renders before the user agrees to a number

A chain is many clips, each one slow and billed. Interview, price it, then wait for a yes.