Create a flat, full-frame business card design with a mecha-anime inspired aesthetic. Focus on sharp edges, geometric shapes (especially squares), and metallic textures. Use a color palette of whites, greys, dark blues, and blacks. Convey a quiet, deadly, and traditional soldier vibe without depicting any characters, robots, or mechas. The image should be the business card design itself, with no backgrounds, scenes, hands, or additional objects. --ar 3:2