相机演化时间线

一张横向长条时间线海报，呈现 200 年相机演化史。暖米色背景，炭黑时间线居中横贯，每 20 年一个刻度，从 1820 到 2020。线上下交替排列八个扁平矢量相机剪影，红铁锈与板岩青配色：「Camera Obscura, 1822」、「Daguerreotype Plate, 1839」、「Box Brownie, 1900」、「Leica I 35mm, 1925」、「Twin-Lens Reflex, 1948」、「这是一条示例内容。」、「这是一条示例内容。」、「这是一条示例内容。」。每个剪影旁边一张小说明卡，配一句简述，如 「相机演化时间线」。顶部主标题 「相机演化时间线」。角落小图例 「From Dark Room to Pocket: 200 Years of Cameras」、「From Dark Room to Pocket: 200 Years of Cameras」、"Digital" 三个图标，对应时间线上的起点。轻微纸纹与扫描线肌理，纯扁平插画。

A long horizontal timeline poster tracing the evolution of cameras across 200 years. Warm cream background, charcoal-black timeline rail running through the vertical midpoint, with year ticks every twenty years from 1820 to 2020. Above and below the rail, eight flat-vector camera silhouettes alternate in red oxide and slate teal: "Camera Obscura, 1822", "Daguerreotype Plate, 1839", "Box Brownie, 1900", "Leica I 35mm, 1925", "Twin-Lens Reflex, 1948", "Polaroid Instant, 1972", "DSLR, 1999", "Smartphone Camera, 2010". Each silhouette has a small fact card beside it with a single-sentence description, e.g. "First mass-market roll-film camera, sold for one dollar". The title across the top reads "From Dark Room to Pocket: 200 Years of Cameras". A small inset key shows three icons for "Optical", "Chemical", "Digital" with their introduction points marked on the rail. Subtle paper grain, faint scanline texture, generous tracking on small caps labels, no photographic textures — purely flat illustration.