A single glowing golden portal, circular arch shape, radiating warm golden light #C9A84C from the center outward, surrounded by deep black and dark navy blue background, mystical and cinematic atmosphere, the portal emits soft volumetric light rays, dark particles floating around the arch, highly detailed, sharp edges on the arch with intricate subtle texture, strong contrast between the dark background and the golden glow, no text, no letters, no human figures, centered composition, perfect for a YouTube channel profile picture, square format 1:1, 4k, photorealistic with slight surreal quality, professional logo aesthetic