Create a brand-new square promotional image in Japanese for shopping day.
Accurately display the text “いい買い物の日”“全品20%OFF”“2026年8月8日-8月10日”.
Use cobalt blue, coral orange, mint green, cream white, and mustard yellow.
Reorganize the horizontal information into a square layout, centering on a large coupon badge.
All Japanese text must be clear, sharp, and suitable for mobile viewing.
The artwork must be a single-frame static design; no animations are allowed.
Do not include any brands, logos, URLs, QR codes, watermarks, or fine print.
Output only one high-quality static PNG image.
