macOS-style abstract wallpaper: smooth silky gradient with flowing luminous folds and soft volumetric light, primary palette of deep navy blue to electric cyan with subtle purple accents, minimal and elegant, glossy highlights and soft reflections, gentle vignette, very low grain, high contrast but soft transitions, no text, no logos, centered composition — designed as a desktop wallpaper in 16:9 aspect ratio, 2560x1440, modern macOS aesthetic, clean and professional.