Disco palette
Indigo Foundry
From #19378f ink through #3f62b9, #587dd7, #6d8edb to #87abfa light, Indigo Foundry 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.
skydiscofive-stophigh-contrast
#19378f
#3f62b9
#587dd7
#6d8edb
#87abfa
The generator opens with #19378f as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.