"Create a soft, abstract gradient background with vibrant, smooth transitions. Use a color palette that transitions through different shades of black. The gradient should move seamlessly from deep, dark black at the top, blending into lighter shades of black, creating a subtle and sophisticated shift in tone. Ensure the texture appears slightly grainy for a vintage, retro aesthetic. The overall style should be smooth, atmospheric, and modern, with a soft-focus effect that enhances the depth and subtlety of the black gradient."