Vertical summer party poster, featuring a huge golden sunset, purple-orange gradient sky, sunset reflection on the sea, black silhouettes of coconut palms and palm trees, silhouette of a surfer walking towards the beach, plus text elements including SUMMER, summer beach, SUMMER VIBE, Summer Party, and a dark blue border. Scene: Summer dusk beach scene, conveying a vibrant atmosphere as the beach party is about to start. Style: Flat gradient illustration style, combining modern design sense with retro gradient colors, clean and delicate画面. Tone: Purple-orange gradient sky, golden sunset, black silhouettes, white text, dark blue border, overall harmonious and unified colors, full of summer vitality. Lighting: Taking the warm golden color of the sunset as the core light source, forming a soft reflection on the sea, silhouette elements set off the main画面, distinct light and shadow layers enhancing the summer dusk atmosphere. Composition: The sunset area at the center of the画面 is the visual core, texts are layered and typeset at the top, middle, curved around, and bottom, with clear visual guidance. Use: Promotion poster for summer party events on e-commerce platforms, or illustrations for summer-themed social media content.