RME-115.H2, your notes from chat, done in PR #726 (not merged yet, the page updates when it is):

1. How we got N is now five pictures, one per Next, from your own numbers: coins per person, the quiet ones keep their coins, a year of their coins piles up, one clean is a small stack, N is how many stacks fit the pile. The sum is only a footnote at the end. Open it with "How we got N, in pictures" at the ask, or tap the N's i.
2. "text goes fast, next next next": every Next now shows one change and holds. 30 steps, a dot each, Back steps back one.
3. "can't see weight": quiet is one strong rose in every scene. In the how-often-to-clean frame the rose weight grows and drops at each clean.
4. "things together": the 15 in 100 label moved to the top, the numbers start after the line, the clean costs sit under each habit's name, the line runs behind the boxes.
5. Payback frame: the three i circles are spaced, the clean bar is filled, the month labels keep clear of the line, darker greys. Checked every step at desktop and phone width.