Aurora palette
Polar Gallery
From #004b63 ink through #007599, #3190b5, #559ebe to #71bbdc light, Polar Gallery is a tetradic 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.
cyanaurorafive-stophigh-contrast
#004b63
#007599
#3190b5
#559ebe
#71bbdc
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.