Create a new original coupon or sale design: bold retail promotion poster with oversized offer typography, punchy outlined lettering, and energetic graphic accents.
Style: clean commercial graphic, polished and print-ready, with harmonious indigo, coral, and pale sage.
Layout: Square promotional composition with a strong centered hierarchy and balanced margins.
Main text exactly: "期間限定セール", "50% OFF", "有効期限 2026.08.31".
Language: Japanese; keep that language and script only, preserve its natural typographic hierarchy, and do not translate.
Design changes: use a different dominant palette, rearrange icons and patterns, and redesign borders, corners, perforations, shadows, gradients, and decorative angles.
Background: Use a newly colored commercial backdrop with no copied texture or decoration.
Remove every brand, store or platform name, logo, watermark, website, QR code, author mark, barcode, and any note beginning with "*".
Avoid exact copying, original colors, copyrighted elements, random text, tiny unreadable legal text, misspellings, fake logos, and scannable codes.
