SNS Giveaway Campaign Banner

[Campaign Information] - Campaign Name: campaign_name - Prize List: prizes - Participation Steps: entry_steps [Image Quality/Direction/Composition] - Style: Pop, bright, and friendly SNS promotional banner. Eye-catching design. - Subject: Illustrations or realistic product photos of prizes popping out of a gift box, surrounded by festive ribbons and star decorations, centered. - Color/Tone: Pastel tones of bright pink, yellow, and light blue to create a sense of excitement. - Text Info (for GPT-image / Nano Banana Pro): The text campaign_name at the top and the simple steps entry_steps at the bottom, laid out clearly in a thick, cute, rounded font. - Lighting: Flat, uniform bright lighting with soft shadows. [Strict Layout Constraints (Required)] - Output the finished flat 2D design itself, filling the entire canvas. Scene elements inside the design (walls, rooms, shadows) described above are allowed. Absolutely NO photo-of-a-poster mockups: no picture frames, no poster-on-wall or poster-on-desk shots, no perspective warp or drop shadow around the artwork's edges. - Aspect Ratio: --ar 1:1 or --ar 16:9