Sumi palette
Pale Beacon
From #971c00 ink through #b72705, #007284, #d7482c to #008fa5 light, Pale Beacon is a analogous progression that holds together at any size. Use it for book covers that read at thumbnail size.
redsumifive-stop
#971c00
#b72705
#007284
#d7482c
#008fa5
The generator opens with #971c00 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.