Vertical summer party poster as main subject, featuring a huge golden sunset, purple-orange gradient sky, sunset reflection on the sea, black silhouettes of coconut trees and palm trees, and a silhouetted surfer walking towards the beach, along with text elements such as SUMMER, 夏日海滩, SUMMER VIBE, Summer Party, and a dark blue border. Scene: Summer beach scene at dusk, presenting a vibrant atmosphere as the evening beach party is about to start. Style: Flat gradient illustration style, combining modern design sense with retro gradient colors, the画面 is clean and delicate. Color palette: Purple-orange gradient sky, golden sunset, black silhouettes, white text, dark blue border, with overall harmonious and unified colors full of summer vitality. Lighting: Centered on the warm golden light of the sunset, forming a soft reflection on the sea, silhouette elements set off the main画面, with distinct light and shadow layers that enhance the summer dusk atmosphere. Composition: The sunset area at the center of the画面 is the visual core, with text layeredly arranged at the top, middle, curved around, and bottom, creating clear visual guidance. Use: Promotional poster for summer party activities on e-commerce platforms, or image matching for summer-themed content on social media.