Create a soft, abstract gradient background with smooth transitions. Use a color palette that shifts from sunset orange on the left, fading into sky blue in the center, and transitioning into light purple on the right. The gradient should be seamless and subtle, with a slightly grainy texture to give it a vintage, retro aesthetic. The overall style should be minimalistic, atmospheric, and modern, with a soft-focus effect that emphasizes the gradient’s smooth transitions and warm, calming tones."