会员促销海报设计卡通风会员升级福利场景插画素材

帮我生成3:4比例，Youth membership promotion poster, dynamic and vibrant event style. The background is a gradient of {blue} to white with flowing, dynamic curves of {blue} and {blue}. At the top, enormous bold white text reads "{会员升级 多重礼遇}", with a small {pink} trumpet decoration floating beside it. Below the title, a {yellow} tag label reads "{限时福利 先到先得}". The central visual focus is a hand holding a {bronze} card with the words "{限定}" and "{铂金会员}" visible on it, the card is surrounded by a thin circle of light. Scattered around the card are cute decorations: a {red} mini camera, a {blue} gift box with a ribbon, and a {orange} cartoon box with a small emoji expression. At the very bottom, a {blue} button with the text "{立即升级}". The overall color scheme is bright and eye-catching, using social media popular colors. Clean, commercial art style, high detail. --ar 3:4