Nebula palette
Porcelain Canyon
Five nebula stops with room to breathe — #00465d grounds, #007092 and #308bae do the talking, #5299b7 softens, #6eb5d4 lifts. The tetradic bones keep it coherent across book covers that read at thumbnail size. The darkest and lightest stops clear AA as a text pair.
cyannebulafive-stophigh-contrast
#00465d
#007092
#308bae
#5299b7
#6eb5d4
The generator opens with #00465d as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.