Double Exposure City Promo Poster

{argument name="event" default="Spring Festival 2026"} {argument name="city" default="Guangzhou"} city promo poster, vertical 9:16, festive yet elegant. Double exposure with S-curve flowing composition on a pure white textured background. Bottom-right corner: a miniature figure in traditional Chinese attire swings a long red silk ribbon that morphs into mountain ridges and river currents, revealing a layered Guangzhou panorama inside, including Canton Tower, Zhujiang New Town skyline, Pearl River with cruise ships, ancient architecture, and Baiyun Mountain. Bottom-left typography: "SPRING 2026" horizontal with a vertical line of Chinese characters reading "Millennial Trade City, Charming Guangzhou."