A light message thread that grows from the bottom, with a video attachment card and a tapback on the last bubble

This is the format it was composed for. Switch above to see it lay itself out for another — same animation, re-arranged for the frame.
No Tailwind, no CSS, no asset files. Inline styles only.
A vertical light-mode message thread as social proof. Bubbles should arrive one at a time and scale up from their tail corner with a small overshoot, the way iOS does — never a fade. The thread has to grow from the bottom and push its own history upward as messages land. One entry is a video attachment card with a play button and a duration pill instead of a bubble, and a tapback pops onto the final message.