Nebula palette
Fern Bluff
Five nebula stops with room to breathe — #00645d grounds, #009288 and #38aea3 do the talking, #61bbb1 softens, #7ed8ce lifts. The tetradic bones keep it coherent across book covers that read at thumbnail size. The darkest and lightest stops clear AA for large text.
tealnebulafive-stop
#00645d
#009288
#38aea3
#61bbb1
#7ed8ce
The generator opens with #00645d as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.