Steampunk Mechanical Heart in a Dark Laboratory

close up of a steampunk machine of human heart. The machine is exposed, made of brass and copper, with intricate spinning gears, pulleys,and tubes emitting faint steam. Tiny miniature people are working inside the chest cavity - some on scaffolding, others turning valves or inspecting blueprints. Electric cable pulse with light, and the heart-machine beats rhythmically. The background is a futuristic laboratory with glowing panels, metallic walls, and a mix of old-world steampunk and sci-fi elements. The lighting is dramatic, casting shadows and highlights across the machine and the tiny workers. All in dramatic dark mood photography style.