A10 — scrolling index / dual-rail

Composes

• scrolling-index-dual-rail (the layout + scroll mechanic)
• active-row-darken (the focus shift as rows cross center)
• inner-video-playback (looping video clips inside media thumbnails)
• persistent-corner-chrome (brand tag bottom-left)

Renderer

hyperframe-gsap by default. Remotion can do it but HTML+GSAP+real video gives more realistic scroll velocity and inner-video playback.

Layout

canvas: viewport-style (often 16:9 or square)