帮我生成3:4比例，Youth membership promotion poster, dynamic and vibrant event style. The background is a gradient of {yellow} to white with flowing, dynamic curves of {yellow} and {yellow}. At the top, enormous bold white text reads "{会员日 狂欢开启}", with a small {orange} trumpet decoration floating beside it. Below the title, a {green} tag label reads "{爆款直降 会员折上折}". The central visual focus is a hand holding a {silver-gold} card with the words "{专属}" and "{精英会员}" visible on it, the card is surrounded by a thin circle of light. Scattered around the card are cute decorations: a {yellow} mini camera, a {blue} gift box with a ribbon, and a {purple} cartoon box with a small emoji expression. At the very bottom, a {yellow} button with the text "{立即参与}". The overall color scheme is bright and eye-catching, using social media popular colors. Clean, commercial art style, high detail. --ar 3:4
