Nebula palette
Lichen Library
Lichen Library runs #004949 through #007474, #318f8f, #539c9c to #6fb8b8 in five measured steps, the monochromatic structure keeping every neighbor honest. Reach for it for book covers that read at thumbnail size. The darkest and lightest stops clear AA as a text pair.
cyannebulafive-stophigh-contrast
#004949
#007474
#318f8f
#539c9c
#6fb8b8
The generator opens with #004949 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.