Jewel palette
Brisk Harbor
Dark anchor, working middle, light release: #004c5f, #007792, #3292ae, #55a0b8, #72bdd5 form a triadic jewel set with somewhere to stand at every lightness. Made for book covers that read at thumbnail size. The darkest and lightest stops clear AA as a text pair.
cyanjewelfive-stophigh-contrast
#004c5f
#007792
#3292ae
#55a0b8
#72bdd5
The generator opens with #004c5f as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.