Nebula palette
Halcyon Garret
From #003789 ink through #2c61b7, #467cd5, #5e8dd9 to #79a9f8 light, Halcyon Garret is a complementary 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.
skynebulafive-stophigh-contrast
#003789
#2c61b7
#467cd5
#5e8dd9
#79a9f8
The generator opens with #003789 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.