히트맵 파도 — demo

Fifty-six cells fill in a diagonal wave — sin phase·5-step density ramp·Canvas tooltip

Visit density by day and hour (0-100) — hours paired into bands
Day	09-10h	11-12h	13-14h	15-16h
Mon	28	50	41	24
Tue	32	58	46	27
Wed	30	61	50	29
Thu	26	61	54	32
Fri	23	61	59	37
Sat	48	72	86	67
Sun	57	80	88	59