高端极简扁平矢量旅行海报，[CITY_NAME]，3:4 竖版构图。

Premium minimal flat-vector travel poster for [CITY_NAME], 3:4 vertical. Create an airy, elegant city scene with large typography-safe negative space in the upper-left. Add “[CITY_NAME]” and one short refined English caption that matches the city mood. Automatically adapt the illustration to [CITY_NAME]: include one iconic primary landmark, local architecture, café culture, a transport sign, street lamps, flowers, trees, small city details, and calm daily-life moments. Use only 3–6 people, naturally interacting with the city: talking at a café, walking, jogging, sketching, or taking photos. Avoid crowds, avoid a single hero character, and keep the composition open and uncluttered. Style: Japanese stationery aesthetic, luxury sticker illustration, premium commercial flat-vector poster, clean thin outlines, consistent line weight, flat colors only. Palette: pale powder blue, soft sky blue, mist blue as the dominant background tones; warm cream, soft beige, sage green, muted gray-green for architecture and nature; dusty rose or blush pink only as tiny accents on flowers, signs, awnings, or small decorative details. Mood: fresh, minimal, elegant, calm, refined, high-end travel postcard and lifestyle branding. No realism, no watercolor, no painterly effects, no photorealism, no shading, no gradients, no texture, no dense background.

高端极简扁平矢量旅行海报，[CITY_NAME]，3:4 竖版构图。 营造通透、雅致的城市场景，左上方预留大面积可排版的负空间。 加入“[CITY_NAME]”以及一句与城市气质相符的简洁精致的英文短标题。 插画内容需根据 [CITY_NAME] 自动适配： 包含一处标志性的核心地标、本地建筑、咖啡馆文化、交通指示牌、路灯、花卉、树木、细腻的城市细节，以及平静的日常生活瞬间。 人物仅设 3–6 人，自然地与城市互动： 在咖啡馆交谈、散步、慢跑、写生或拍照。 避免人群拥挤，避免单一主角人物，保持构图开阔、留白充足。 风格： 日系文具美学，奢华贴纸插画，高端商业扁平矢量海报，干净的细线条，统一的线条粗细，仅使用纯色填充。 配色： 以淡粉蓝、柔天空蓝、雾蓝为主背景色调； 建筑与自然使用暖奶油色、柔米色、鼠尾草绿、灰调绿； 仅在花朵、招牌、雨棚或小型装饰细节上，以暗玫瑰色或腮红粉作为极小面积的点缀。 氛围： 清新、极简、雅致、宁静、精炼，高端旅行明信片与生活方式品牌质感。 不使用写实、水彩、绘画笔触、照片级真实、阴影、渐变、纹理或密集背景。