Create a brand-new square coupon poster in Japanese for summer promotions.
Accurately display the text “SUMMER SALE”“合計金額から割引”“2,500円OFF”“4,000円OFF”“8,000円OFF”“2026.08.01-08.20”.
Use teal, coral orange, violet, cream white, and bright yellow.
Show three tiered discount amounts using three large stepped coupons.
Add sunburst rays and confetti while maintaining an orderly square layout.
All text must be clear, without using small print in legal-size font.
Do not include any brands, logos, URLs, QR codes, or watermarks.
Output a high-quality static PNG image.
