水彩幻化现实：北京 CBD 海报

Create a vertical city poster showing {argument name="city district" default="Beijing Guomao CBD"} transforming from watercolor painting into photorealism. The canvas is portrait-oriented, about 4:5, with a seamless left-to-right transition: the left half is a loose watercolor illustration with visible paper texture, splattered pigment edges, soft pastel washes in blue, lavender, peach, yellow, and teal, while the right half gradually becomes a crisp realistic aerial city photograph under a bright blue sky with scattered clouds. The skyline must feature the Beijing CBD landmarks: the tall China Zun tower dominating the right side, the CCTV Headquarters angular loop building near the center-right, and multiple glass skyscrapers on the left-center, with broad roads, traffic lanes, trees, low-rise blocks, and urban avenues visible below. Add elegant Chinese title typography in the upper-left reading {argument name="headline text" default="国贸CBD"}, with a thin horizontal divider line beneath it and smaller subtitle text reading {argument name="subtitle text" default="从水彩到现实"}. Use warm late-afternoon sunlight, high detail on the realistic side, dreamy translucent watercolor blooms on the painted side, and make the boundary between painting and reality feel poetic and fluid, as if the city is waking from a scroll. No people, no watermark, no extra labels.