Create a detailed 3D model of a katana sword with a modern, sleek design. The blade should be sharp, metallic, and polished, featuring subtle engraved patterns. The hilt should have an ergonomic grip with carbon fiber and leather textures, accented with minimal neon or metallic highlights. Include a stylish tsuba (guard) with geometric or futuristic patterns, and a matching sheath with modern detailing. Model must be game-ready, with clean topology, separate objects for blade, hilt, and sheath, UV-unwrapped, and optimized for real-time engines (OBJ or FBX format). Render in realistic PBR materials suitable for a modern or cyberpunk aesthetic