楼梯上的遮挡式电影感肖像

Create a moody, grainy analog-film style portrait of exactly one young person sitting on outdoor stone stairs in front of a dark building entrance. The subject has long {argument name="hair color" default="black"} hair falling over the shoulders, wears an oversized dark navy zip jacket and a pastel tie-dye T-shirt with pale pink and blue tones, and sits casually with arms folded near the knees. Place exactly one large opaque Show exactly three broad gray stone stair treads behind and beneath the subject, with a dark doorway and weathered wall details in the background. Use a square 1:1 crop, close medium framing from upper thighs to above the head, soft dim natural light, muted colors, shallow depth of field, subtle underexposure, visible film grain, and a candid street-photography feeling. The setting should feel like {argument name="setting mood" default="quiet urban evening"}; keep the pose relaxed and introspective, with no text, no logos, and no extra people.