A phone mockup that stays pinned while four feature steps scroll past beside it; as each step reaches the middle of the screen the phone's display slides to that step's screen and a dot track on the phone counts along.
Screens live in one column; active index n sets `transform: translateY(-n × 100%)` on the column (500 ms cubic-bezier(.65,0,.35,1)), while the screen leaving gets `scale(.94)` and dims, so the change reads as a page slide inside the device rather than a cut.
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