白色无缝背景时尚大片

生成一张 4:5 竖版白色无缝背景时尚大片。中国女性时装模特站在大型影棚弧形无缝纸背景前，背景为浅钴蓝到白色的干净渐变，穿结构感银灰长风衣和黑色高领内搭，做夸张但优雅的跨步姿态，外套下摆有运动感。全身构图，脚到头完整可见，地面与背景无缝连接。灯光为大面积柔光加左侧窄边缘光，影子干净。色调为浅钴蓝、银灰、黑白，高级时尚杂志感。人物比例真实，腿部和头身比例自然，不要压扁。画面内不要出现任何可读文字、logo、水印、品牌、摄影棚标识或海报。

Create a 4:5 vertical fashion editorial on a seamless studio backdrop. A Chinese female fashion model stands in front of a large cyclorama seamless-paper background with a clean pale cobalt-blue to white gradient. She wears a structured silver-gray long trench coat over a black turtleneck and makes an exaggerated but elegant walking pose, with the coat hem showing motion. Full-body composition with head and feet fully visible; floor and background join seamlessly. Lighting: large softbox plus narrow left rim light, clean shadows. Palette: pale cobalt blue, silver gray, black and white, with refined fashion magazine styling. Realistic proportions, natural leg and head-to-body ratio, no compression. No readable text, logo, watermark, brand, studio mark, or poster anywhere.