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.