Loud Flash Sale Promotional Poster

[Format] Professional e-commerce product main image, square 1:1, loud flash-sale poster built from red blocks, diagonal ghost words and a central white type panel. [Colors] Background saturated red (#c4342a) tiled with darker red diagonal "SALE" and "HOT" lettering. Centre panel white. The calligraphy title in dark red; coupon blocks in black and white; the bottom line in white. No frame border. [Layout] A full-bleed red ground with repeating tilted background words. The centre holds a large white rounded panel carrying the calligraphy headline and two coupon cards side by side. Beneath the panel runs one line of white start-time text. [Subject] No people. A pure typographic composition; the only graphics are the ghosted diagonal SALE and HOT letters and the two coupon cards inside the panel. [Headline] White panel: "Limited-Time Flash Sale" in huge expressive red calligraphy. Left black card: "$50" in giant white with "no-threshold coupon" beside it. Right white card outlined in black: "Limited to" in small text above a giant "99" with a tiny "sheets" tag. Below the panel: "Grab it Dec 11, 10:00 sharp" in bold white. [Mood] Urgent, loud and deal-crazy; red-on-red sale energy with calligraphy punch, impossible to miss at thumbnail size.