Bluebell
Bluebell (#4F61D6) is a true blue with a cool character. It leans cool, sitting on the blue, green, and violet side of the wheel. Quiet and dependable, a fit for product UI and data visualization. Its HSL profile (232°, 62%, 57%) places it in the balanced band at a mid lightness. It works across type, buttons, and borders, saturated enough to feel deliberate but balanced enough to not fight the rest of the palette. For a confident two-color system, pair it with its complementary amber. For something softer, pull in its analogous neighbors on either side of the wheel. The bell-flower blue of Hyacinthoides non-scripta, which carpets British oak woods in April. Ancient forests show bluebells by the mile — a reliable ecological marker of old woodland.