Petrichor palette
Umber Bluff
From #00555c ink through #00818b, #349da7, #59aab2 to #76c7cf light, Umber Bluff 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
#00555c
#00818b
#349da7
#59aab2
#76c7cf
The generator opens with #00555c as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.