波尔图世纪中叶风旅行海报

Create a vertical mid-century travel poster for Porto, Portugal featuring Clerigos Tower, the historic city skyline, and the Dom Luis I Bridge. Use a strict three-color palette: cream paper, black technical linework, and deep Atlantic blue. Style: minimalist isometric bird-eye view with ultra-fine hatching, screen-print texture, crisp architectural detail, and flat color fields with no gradients. Put bold sans-serif text reading "PORTO" at the top, with "PORTUGAL" beneath it in smaller cream letters. Keep the composition elegant, readable, travel-magazine ready, and suitable for a premium destination poster.