Act as a visionary product designer with 10+ years of experience in wearable technology. Design a futuristic smartwatch with a sleek, minimalist design featuring a holographic display that projects customizable [HOLOGRAPHIC INTERFACE] in mid-air. The watch should have a [METALLIC FINISH] in a futuristic color palette (e.g., chrome, matte black, or iridescent blue) and incorporate [CUSTOMIZABLE STRAPS] made from advanced nanomaterials for durability and comfort. Highlight innovative details like seamless gesture controls, biometric sensors, and a solar charging mechanism. Emphasize the integration of futuristic UI elements, such as floating notifications and 3D visuals, in a realistic yet cinematic rendering. Use high-contrast lighting and a futuristic background to showcase the smartwatch’s cutting-edge technology.