A high-contrast, energetic promotional poster in a vertical 9:16 format. The central focus is a {{product}} floating dynamically in the middle of the composition. The color palette features a striking combination of deep black and vibrant {{brand_color}}. The background has an edgy, urban streetwear aesthetic with subtle dark grunge textures, faint graffiti tags, and distressed scratch marks. Bold, outlined, stylized typography at the top reads "{{event_name}}", and massive, solid block letters below the product read "{{main_text}}". Hand-drawn white accent doodles like small stars, lightning bolts, directional arrows, and a price tag are scattered around the composition. A thick, solid {{brand_color}} vertical stripe anchors the layout down the center. Clean, modern sans-serif typography at the bottom reads "{{offer_text}}" alongside a bright call-to-action button that says "{{button_text}}". High resolution, professional graphic design, streetwear marketing aesthetic, bold, punchy, and highly engaging.