Nebula palette
Sumac Cottage
Five stops tuned to sit together without fighting — #004276 ink anchors the set, #6cb1f7 opens it up, and #0069b6, #2e85d4, #5094d8 cross the middle in a analogous arrangement. Sumac Cottage suits book covers that read at thumbnail size. The darkest and lightest stops clear AA as a text pair.
skynebulafive-stophigh-contrast
#004276
#0069b6
#2e85d4
#5094d8
#6cb1f7
The generator opens with #004276 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.