Petrichor palette
Obsidian Lighthouse
Five petrichor stops with room to breathe — #00646e grounds, #00919f and #38adbb do the talking, #61bbc7 softens, #7ed8e4 lifts. The analogous bones keep it coherent across book covers that read at thumbnail size. The darkest and lightest stops clear AA for large text.
cyanpetrichorfive-stop
#00646e
#00919f
#38adbb
#61bbc7
#7ed8e4
The generator opens with #00646e as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.