minimalistic neon 2D game upgrade card, black background, simple clean neon outline frame, flat graphic design, glowing line art, arcade aesthetic, minimal geometric shapes, centered weapon icon, subtle neon glow, elegant and readable mobile game UI, thin outline details, high contrast, cyan and magenta accents, simple composition, dark negative space, modern roguelike card design, iconic silhouette, vector style, clean lines, premium casual game art, no complex sci-fi details, minimal decoration