创作一张精致的复古旅行海报，采用中世纪现代加州插画风格，契合1950至1960年代高端丝网印刷旅游海报的视觉语言。

Create a sophisticated vintage travel poster in a mid-century modern California illustration style, matching the visual language of a premium 1950s–1960s screen-printed tourism poster. Composition: vertical 2:3 poster, clean centered layout, large elegant city name at the top in widely spaced geometric sans-serif lettering, with “CALIFORNIA” beneath it in smaller uppercase letters and a thin horizontal divider. Below the typography, create a large soft-edged circular/arched sky vignette containing the city skyline and iconic landmarks. Use layered foreground hills, winding paths, stylized vegetation, and architectural landmarks to create strong depth. Visual style: flat editorial illustration, simplified geometric forms, subtle paper grain, slightly weathered screen-print texture, restrained detail, soft edges, sophisticated vintage color blocking, minimal shadows, no photorealism, no gradients-heavy 3D rendering. Color palette: warm ivory/cream background, dusty powder blue sky, muted sage and olive greens, desaturated teal, warm off-white architecture, charcoal/navy typography, and restrained terracotta accents. Low saturation, harmonious and nostalgic. Typography: elegant thin geometric sans-serif, generous letter spacing, centered alignment, premium travel-poster aesthetic. Text should be crisp and correctly spelled. For Los Angeles: prominently feature Griffith Observatory, the Capitol Records Building, palm trees, the Hollywood skyline, the Pacific Wheel/ferris wheel, the Theme Building-inspired architecture, and sweeping elevated roadways, arranged into one cohesive illustrated landscape. For San Francisco: prominently feature the Golden Gate Bridge, Transamerica Pyramid, Coit Tower, Palace of Fine Arts, Alcatraz Island, rolling hills, dense greenery, and a winding road, arranged into one cohesive illustrated landscape. Lighting & atmosphere: bright California daylight, pale blue sky, a few simple cream-colored clouds, calm optimistic mood, refined nostalgic tourism aesthetic. Important: preserve the clean graphic hierarchy and spacious composition of classic vintage travel posters. Avoid photographic realism, excessive text, modern cars, people, clutter, logos, watermarks, or overly saturated colors.

创作一张精致的复古旅行海报，采用中世纪现代加州插画风格，契合1950至1960年代高端丝网印刷旅游海报的视觉语言。 构图：竖版 2:3 海报，干净的居中布局，顶部用宽字距的几何无衬线字体书写优雅的大号城市名，下方以较小的全大写字母标注 “CALIFORNIA”，并配以细横线分隔线。在文字下方，绘制一个边缘柔和的圆形/拱形天空晕影区域，内含城市天际线与标志性建筑。利用分层的前景山丘、蜿蜒小径、风格化植被以及建筑地标，营造强烈的纵深感。 视觉风格：平面编辑插画，简洁的几何造型，细腻的纸质颗粒感，轻微做旧的丝网印刷质感，克制的细节，柔和的边缘，精致的复古色块处理，极少的阴影，无照片写实，无重渐变的3D渲染。 配色：温暖象牙白/奶油色背景，粉雾天蓝天空，柔和的鼠尾草绿与橄榄绿，低饱和度的青蓝，暖调米白建筑，炭灰/深藏青字体，以及克制的赤陶色点缀。低饱和度，和谐而怀旧。 字体：优雅纤细的几何无衬线字体，宽阔的字距，居中对齐，高端旅行海报美学。文字应清晰且拼写正确。 洛杉矶版本：突出呈现格里菲斯天文台、Capitol Records 唱片大楼、棕榈树、好莱坞天际线、Pacific Wheel 摩天轮、Theme Building 风格的建筑，以及蜿蜒的高架道路，整合为一个统一的插画景观。 旧金山版本：突出呈现金门大桥、泛美大厦（Transamerica Pyramid）、科伊特塔、艺术宫（Palace of Fine Arts）、恶魔岛、连绵山丘、茂密绿植以及一条蜿蜒公路，整合为一个统一的插画景观。 光照与氛围：明亮的加州日光，浅蓝的天空，几朵简洁的奶油色云朵，平静乐观的情绪，精致怀旧的旅游美学。 重要提示：保持经典复古旅行海报的清晰图形层级与宽敞构图。避免照片写实、过多文字、现代汽车、人物、杂乱元素、标志、水印或过度饱和的色彩。