Young maid with transforming sci fi weapon in industrial hall

A lovely young woman from the East, dressed in a black and white maid outfit with futuristic details, stands in a dimly lit futuristic industrial facility. She calmly raises a small pistol forward with one hand. The camera slowly zooms in. The moment the muzzle points forward, the pistol begins an incredibly precise mechanical transformation. Numerous metal parts unfold layer by layer, their internal mechanical structures rotating, sliding, engaging, and extending. Blue energy patterns gradually illuminate the gaps in the unfolding armor. The small pistol rapidly transforms into a massive, futuristic, high-tech heavy weapon. A large number of magnetic rail structures, an energy core, rotating mechanical parts, hydraulic devices, and a carbon fiber shell continue to assemble and unfold. The entire transformation process has a realistic sense of engineering structure, like a real-life mechanical prop from a Hollywood science fiction movie. The girl slightly adjusts her posture to support the weight of the weapon. Her hair and skirt vibrate slightly with the energy vibrations.