Design a futuristic armor chest piece with the following modifications: 1. Change the color scheme to a matte black with metallic blue accents. 2. Replace the mesh panel with a sleek, solid surface featuring subtle geometric etchings. 3. Add angular, integrated shoulder pads for enhanced protection. 4. Introduce a high-tech visor at the top that can retract, enhancing visibility and functionality. 5. Incorporate a new locking mechanism on the sides that appears more streamlined and minimalistic. Focus on a combination of aesthetics and functionality suitable for a sci-fi environment.