A numbered feature list beside a sticky image column: scroll past each step and its own photo crossfades into view in the sticky frame, while a vertical rail fills to show progress and the active step's number badge turns solid. Step component props: number, title, description, image, imageAlt, showLink, linkLabel, linkHref. Progressive enhancement: with JavaScript off every step keeps its own inline photo in a simple one-column list; JS moves each photo into the sticky frame and wires the IntersectionObserver-driven crossfade. Section options: data-theme (light|dark) section surface.