Petrichor palette
Nightfall Hollow
From #007078 ink through #009ea9, #3cbbc6, #67c8d1 to #85e6ef light, Nightfall Hollow is a monochromatic progression that holds together at any size. Use it for book covers that read at thumbnail size. The darkest and lightest stops clear AA for large text.
cyanpetrichorfive-stop
#007078
#009ea9
#3cbbc6
#67c8d1
#85e6ef
The generator opens with #007078 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.