Design a 16:9 Black Friday event poster featuring a high-contrast, professional aesthetic with a sleek, modern design. The background should transition from dark to charcoal gradient, incorporating a soft, blurred texture to add subtle depth. Center the text “BLACK FRIDAY” in bold, capitalized, sans-serif font (e.g., Montserrat or Helvetica), colored in vibrant white with a slight glow effect to ensure it stands out against the dark background. Beneath this, position the phrase “BIG SELL” in a narrower, slightly elongated font (e.g., Lato or Open Sans) to create a layered, dynamic appearance. This text should be styled in a neon red or blue hue to enhance contrast and readability. At the lower center, place a Call-to-Action button labeled “CALL US NOW,” designed as a rounded rectangle with a smooth gradient transitioning from deep red to neon orange, simulating a "clickable" effect. The button should feature a subtle shadow for added depth, with the text inside rendered in a clean, minimalist white font (bold for easy readability). Incorporate minor accents such as thin lines or small geometric shapes (triangles, circles) in soft neon colors around the edges to create a high-tech, sleek atmosphere without overwhelming the core message. The overall lighting should be focused and professional, with slight highlights around the “BLACK FRIDAY” text to draw immediate attention. Maintain a spacious layout with clear separation between elements, ensuring a balanced and visually appealing composition that effectively communicates the urgency of the Black Friday event. Keywords: Black Friday poster, high-contrast design, modern aesthetic, bold typography, neon accents, professional layout, Call-to-Action button, sleek atmosphere, visually appealing composition.