Kinetic typography prompt — vertical hook, 6 seconds

<direction> A 6-second vertical hook film, 1080x1920 vertical. STOP SCROLLING START SHIPPING. — four words, one at a time, centre frame, each word sized so it nearly fills the 1080 width (short words huge, long words smaller — set per-word sizes, not one size). The last word is accented. Each word slams in (scale from 1.25, 0.15s) and hard-replaces the previous. At ~3.3s all four restack as a left-aligned list at ~104px, a short rule draws, and the payoff FOUR WORDS. THREE SECONDS. THAT IS THE WHOLE HOOK. fades in under it. A thin progress bar fills across the full 6 seconds at the bottom. Banned: glows, gradients, bouncing/elastic word entrances, more than four words in the hook, captions under each word. </direction> <structure> Words at 0.65s steps from 0.35s. Big word clears 3.15s. Stack lines stagger in from 3.4s (0.13s steps). Rule 4.1s, payoff 4.35s. Progress bar runs 0–6s linear. </structure> <build> One HyperFrames composition, seek-driven GSAP. Per-word font sizes are set individually in CSS. The stack is a separate pre-built stage revealed at the cut — animating four different-sized words into a list mid-flight is where hooks go to die. </build> <gotchas> At a 1.45 starting scale the longest word overflowed the frame mid-slam and, caught mid-fade, read as a murky slab. 1.25 is the ceiling for frame-filling words: the settled word still touches both edges, and no frame of the slam looks broken. </gotchas> Before you finish: step through the timeline at five points and fix anything that overlaps, clips the frame, or drifts off the beat grid.