Create an original vertical stack of purple, red, pink, and white coupon labels. Text: “50 优惠券”, “40 立减优惠”, “159 满500可用”, “40 优惠券”, “70”. Use stronger saturation, clean negative space, and only a few subtle edge highlights; no ribbons, confetti, or burst marks. Transparent background. No logo, watermark, QR code, website, or note text.