Dual Faces of Gemini: Light and Dark Collide

A high-resolution vertical split-screen portrait. Left side: A realistic photo of the woman from the reference image, facing forward with her hand down by her side (not touching her face). She is wearing a black Nike t-shirt with a subtly glowing white Nike swoosh. The lighting is clean and professional. Right side: A dark, cinematic demon version of the same woman. Her skin is deep red with a cracked texture, featuring a large curved horn. Her eye glows with intense blue light. Overlaid across her face and the dark background are complex mathematical equations and geometric diagrams in a glowing holographic blue. The transition between the two sides is a sharp, vertical line.