Nebula palette
Cobalt Pagoda
Five nebula stops with room to breathe — #004663 grounds, #006f9b and #308ab8 do the talking, #5299c0 softens, #6eb5dd lifts. The monochromatic bones keep it coherent across book covers that read at thumbnail size. The darkest and lightest stops clear AA as a text pair.
skynebulafive-stophigh-contrast
#004663
#006f9b
#308ab8
#5299c0
#6eb5dd
The generator opens with #004663 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.