伊斯坦堡復古海報，描繪聖索菲亞大教堂，採三色設計，奶油背景、黑色線條與橘色點綴

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Design a vertical retro mid-century travel poster of [CITY NAME] showcasing [LANDMARK]. Stick to a tight 3-color scheme: cream-toned paper background, black technical line drawing, plus one [COLOR] accent.
Aesthetic: minimalist isometric top-down aerial perspective with very fine cross-hatching and silkscreen print grain.
Color rules: fill the entire sky in flat solid [COLOR], add small [COLOR] touches on rooftops or street details. Zero gradients allowed.
Typography: large bold sans-serif "[CITY NAME]" at the top in cream, with the city's name in its native language set smaller in cream beneath it.