黑色线稿上海明信片

设计一张上海主题明信片，采用干净有表现力的黑色线稿插画风格：画面组合外滩历史建筑、东方明珠、黄浦江轮廓、老城街巷、梧桐树与小型电车等城市意象，建筑以准确简洁的轮廓和丰富但克制的线条细节呈现。以白色纸张为底，黑色线稿为主，仅用少量朱红与湖蓝作印章、招牌或江面反光点缀；保留明信片边框、邮票与地址线等版式元素，但不使用真实品牌标志。加入清晰简洁的中文标题“上海”，文字工整可读，纸张有轻微纤维与印刷肌理，现代文创纪念品质感，无水印。

【English Prompt】
Design a Shanghai-themed postcard in a clean expressive black-line illustration style. Combine visual motifs of the historic Bund buildings, Oriental Pearl Tower, Huangpu River outline, old-city lanes, plane trees, and a small streetcar. Render architecture with accurate simplified silhouettes and rich but restrained line detail. Use white paper as the base with black linework dominant, adding only small vermilion and lake-blue accents for a seal, sign, or river reflection; include postcard border, stamp, and address-line layout elements without real brand logos. Add the clear Chinese title “上海” in sharp legible lettering. Give the paper subtle fiber and print texture, with a modern cultural-souvenir feel, no watermark.

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