Petrichor palette
Silken Outpost
From #006e78 ink through #009ca9, #3bb8c6, #66c6d1 to #84e3ef light, Silken Outpost is a analogous 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
#006e78
#009ca9
#3bb8c6
#66c6d1
#84e3ef
The generator opens with #006e78 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.