Nebula palette
Soft Fen
Dark anchor, working middle, light release: #006584, #0091bc, #39add9, #62bce1, #81d9ff 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 for large text.
cyannebulafive-stop
#006584
#0091bc
#39add9
#62bce1
#81d9ff
The generator opens with #006584 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.