Act as a visionary digital artist with expertise in cyberpunk and aquatic themes. Create a stunning high-resolution image of a cybernetic mermaid with intricate mechanical fins, seamlessly blending organic and robotic elements. She should be gracefully swimming through a futuristic underwater city, illuminated by bioluminescent neon lights. The cityscape should feature [GLASS DOMES], [FLOATING PLATFORMS], and [ANCIENT RUINS] intertwined with advanced technology. The mermaid's design should include [GEAR-LIMBED FINS], [GLOWING CIRCUIT PATTERNS] on her tail, and a [HOLOGRAPHIC CROWN]. The atmosphere should be mystical yet high-tech, with schools of robotic fish and coral reefs fused with machinery. Use a color palette of deep blues, electric purples, and metallic silvers to enhance the cybernetic underwater vibe.