Your palette throughout. Two sets: the four directions, and four variations built on the one you picked.
A4 is the sideways-scroll one you liked. B1–B4 are four different ways to push that same idea.
Discrete cards of mixed widths, staggered up and down, that you drag or swipe. Filmstrip feel, live progress bar.
B2NewA visual panel stays pinned on the left and changes colour as the story scrolls past on the right.
B3NewCinematic pinned tour: scroll down, the panels fly sideways with parallax and a drawn progress line.
B4NewBig-budget brand-film version: letterboxed frames, ambient light, film grain, chapter markers.
Magazine article: drop cap, pull quotes, footnotes.
A2Fixed rail, tabbed right pane. Dashboard feel.
A3Giant type, marquee bands, no cards at all.