Prompt code:
An illustration of a t-shirt design with Lumina the black cat leaping from a swirling neon portal. The portal is an intense, electric blue circle with darker swirls. Lumina's eyes glow bright neon green. Around the portal, small symbols and geometric shapes in neon purple, pink, and yellow float. Wisps of energy trail behind Lumina. Faint outlines of strange landscapes are barely visible. The effect is mysterious and adventurous. The design is isolated on a warm golden yellow background to contrast with the cool blue portal and black cat.
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