Jewel palette
Clouded Brook
From #004b63 ink through #097598, #3490b4, #569ebd to #73bbdb light, Clouded Brook 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 as a text pair.
cyanjewelfive-stophigh-contrast
#004b63
#097598
#3490b4
#569ebd
#73bbdb
The generator opens with #004b63 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.