SNS Giveaway Campaign Banner

[Campaign Information]
- Campaign Name: {argument name="campaign name" default="{campaignName}"}
- Prize List: {argument name="prizes" default="{prizes}"}
- Entry Conditions/Steps: {argument name="entry steps" default="{entrySteps}"}

[Image Quality/Direction/Composition]
- Style: Pop, bright, and friendly SNS promotional banner. Eye-catching design.
- Subject: Illustrations or realistic product photos of {argument name="prizes" default="{prizes}"} popping out of a gift box, surrounded by glamorous ribbons and star decorations, depicted in the center.
- Color/Tone: A color scheme that creates excitement, such as bright pastel pink, yellow, and light blue.
- Text Information (for GPT-image / Nano Banana Pro): The text {argument name="campaign name" default="{campaignName}"} at the top and simple participation steps like {argument name="entry steps" default="{entrySteps}"} at the bottom are clearly laid out in a thick and cute round font.
- Lighting: Flat, uniform, bright lighting with softened shadows.

[Strict Layout and Output Constraints (Required)]
- Output the finished design itself filling the entire screen. Background and scene depictions (walls, spaces, shadows, etc.) inside the design may follow the instructions in the text.
- Prohibited items: Photos of the finished poster in a frame, photos of it on a wall, mockup photos on a desk or paper, perspective distortion of paper edges, or drop shadows.
- 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"