abstract art background,

abstract art background, black base color, smooth rainbow-colored light band extending from top left to bottom right in an S-shape, gradient from deep red, orange, yellow, green, cyan, blue to purple, soft edges, high brightness in the middle, glowing texture, mysterious and dynamic atmosphere, as if light is flowing in the dark, sense of technology and futurism, bright and high saturation colors, strong visual contrast with black background, modern minimalist style, strong sense of light and shadow flow, symbolizing diversity, innovation and brightness, positive emotional direction