Subject: Symmetrically expanding black and gold flowing ultra-fine curved lines. Scene: High-end event visual scene with a dark blue gradient background. Style: Simple and luxurious high-end geometric streamline style. Color scheme: Main color is a dark blue silky gradient, paired with black and gold low-transparency lines, the color contrast is soft and high-end. Lighting: The background presents uniform and soft gradient lighting, the lines have a subtle translucent texture. Composition: Symmetrical composition, lines expand orderly from the bottom to both sides, overall layout is neat and balanced. Use case: High-end event backdrop, high-end brand promotion main visual, 8K resolution high-end wallpaper.