Halloween Sale Poster Retro Paper-Cut Collage

Professional Halloween sale poster, vertical 9:16, retro paper-cut collage. [Colors] Electric purple field (#5B21C9), lime-chartreuse accent (#C6F53C), sale card in tangerine (#F5811F), cream paper (#FBF3E4). [Layout] Oversized two-line headline across the top with radiating dash marks, a ghost peeking over a tilted orange card at center carrying a giant discount numeral, a smiling jack-o'-lantern overlapping the card's lower-right corner, a pill-shaped call-to-action button near the bottom, dates in the top-right corner. [Typography] Bold condensed poster sans for the headline, chunky outlined numeral filling the card, rounded bold sans for the button label. [Subject] Flat white paper-textured ghost with black oval eyes and an open smile, both hands gripping the card edge; graphic pumpkin with triangular cut eyes and a jagged grin. [Lighting & Mood] Bright, punchy, high-contrast pop with no cast shadows, loud retail energy. [Details] Sparkle stars, chevron tick marks around the button, torn-paper edges, visible grain on the colored card, '50% OFF' plus 'Halloween Sale' lockup.