Nebula palette
Sooty Foundry
From #50218c ink through #764fb6, #906ad4, #9d7fd9 to #b99af7 light, Sooty Foundry 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.
bluenebulafive-stophigh-contrast
#50218c
#764fb6
#906ad4
#9d7fd9
#b99af7
The generator opens with #50218c as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.