Nordic palette
Iris Caravan
From #004755 ink through #007186, #308ca2, #529aac to #6eb6c9 light, Iris Caravan 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.
cyannordicfive-stophigh-contrast
#004755
#007186
#308ca2
#529aac
#6eb6c9
The generator opens with #004755 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.