Six scroll-storytelling templates (5.4) — each sets --usa-story-progress and fires usa:step. Under reduced motion nothing slides or zooms: the gallery stacks, counters show their final values.
Chapter one — the stage stays pinned while the text scrolls.
Chapter two — the active step drives the stage via data-active-step.
Chapter three — style it with plain CSS.
Every story starts with a question.
The paragraph crossing the middle of the screen lights up.
The others step back so the reader keeps their place.