Classification of gradient colors in flat design

Quick answer：

Gradient colors in flat design are typically categorized into linear gradients, radial gradients, angle gradients, and diamond gradients. Linear gradients transition colors along a straight line, radial gradients from a central point, angle gradients based on a specified angle, and diamond gradients with a diamond-shaped transition area. These gradients add depth and interest to flat designs without the use of shadows or textures.