Aurora palette
Walnut Pagoda
From #004860 ink through #007295, #308db1, #539bba to #6fb8d7 light, Walnut Pagoda is a analogous 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
#004860
#007295
#308db1
#539bba
#6fb8d7
The generator opens with #004860 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.