Nebula palette
Tidal Hollow
Dark anchor, working middle, light release: #004945, #00756f, #31908a, #539d97, #6fb9b3 form a tetradic nebula set with somewhere to stand at every lightness. Made for book covers that read at thumbnail size. The darkest and lightest stops clear AA as a text pair.
cyannebulafive-stophigh-contrast
#004945
#00756f
#31908a
#539d97
#6fb9b3
The generator opens with #004945 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.