Retro Robot Pixel Avatar

A 36x36 pixel-art avatar of a boxy retro robot with a rounded antenna, a green oscilloscope-line face display showing a smile, and rivet details on its metallic body. Cool palette of steel-gray, lime-green, and orange accents, chunky hard-edge pixels, subtle shading dither, dark-teal background with faint circuit lines, centered square, playful nostalgic 8-bit sci-fi vibe.