Create a vertical 9:16 screenshot-style image of a fictional short-video live-stream interface. The live streamer is [Streamer Name], shown speaking directly to the camera in an indoor room while holding a clear handwritten sign that reads [Sign Message]. Use a realistic mobile live-stream look with a status bar, profile area, follow button, viewer count, floating reactions, gift icons, ranking badges, comment feed, and bottom chat input, but keep the platform fictional and generic. The streamer should look like an adult real-person subject with natural phone-camera lighting, a casual background, and believable live-video compression. Make the handwritten sign large, centered, and legible. Use Chinese UI text and comments, but avoid real platform logos, real brand names, private phone numbers, real accounts, or defamatory claims. Output a polished but authentic 9:16 mobile live screenshot.