Jewel palette
Lupine Library
Dark anchor, working middle, light release: #3a6798, #00708a, #007471, #308ba6, #25908c form a triadic jewel set with somewhere to stand at every lightness. Made for book covers that read at thumbnail size.
cyanjewelfive-stop
#3a6798
#00708a
#007471
#308ba6
#25908c
The generator opens with #3a6798 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.