Subject: Black and gold fluid ultra-fine curved lines that expand symmetrically from left to right. Scene: High-end event visual scene with a dark blue gradient background. Style: Simple luxury advanced geometric streamline style. Color: Main color is dark blue silky gradient, paired with low-transparency black and gold lines, soft and advanced color contrast. Lighting: Background presents even and soft gradient lighting, lines have subtle transparent texture. Composition: Left-right symmetric composition, lines expand orderly from the bottom to both sides, overall layout is neat and balanced. Use: High-end event backdrop, high-end brand promotional main visual, 8K resolution high-end wallpaper.