Mainframe, computer architecture, 4 main layers, futuristic, metallic, sleek, circuit boards, wires, microchips, CPU, motherboard, RAM, ROM, storage devices, input/output interfaces, control units, arithmetic logic units, instruction decoders, registers, buses, system interconnects, silicon wafers, integrated circuits, electronic components, complex structures, high-tech laboratory, white background, minimalistic composition, spotlighting, sharp focus, detailed textures.