Geometric Line Art Architecture Poster

Create a high-resolution 3:4 poster based on the {argument name="theme" default="city"}. The poster uses a 1:1 split layout. The top half is a realistic scene capturing the core atmosphere of the theme (cityscape, street life, culture). The bottom half extracts the subject's structure and silhouette, reconstructing it as a minimalist geometric line art graphic with thin lines, clear perspective, and restrained negative space. Includes an integrated typography system for titles, coordinates, and years. Colors should be custom-tailored to the theme's specific mood rather than using generic templates. The final result should be clear, modern, and aesthetically sophisticated.