2D flat cartoon space background with a gradient from dark navy blue at the bottom to purple at the top, soft swirling nebula-like patterns in shades of purple and pink, scattered stars of various sizes in white and light purple, minimal and smooth design, no hard edges, stars subtly glowing with soft edges, gentle sparkle effect throughout, whimsical and dreamy aesthetic, optimized for animation background use  --ar 16:9 --tile