empty school rooftop in summer, a white concrete rooftop ledge, a navy school bag placed casually on the ledge, a simple white gym shirt draped beside it, the shirt hem and straps lightly fluttering in the wind, bright vivid blue sky, soft white clouds, distant low cityscape, strong natural sunlight, clean airy atmosphere, subtle nostalgic mood, Taiwanese / Japanese coming-of-age film still feeling, minimal composition, no people, cinematic realism, delicate fabric motion, quiet summer afternoon, highly detailed, photorealistic, soft filmic color grading