style:
  id: grain-diary
  name: 颗粒日记
  name_en: Grain Diary
  category: [摄影, 人物, 建筑]
  visual_dna:
    line: {organic: 45, precision: 55}
    color: {saturation: 38, warmth: 62}
    lighting: {softness: 62, contrast: 38}
    texture: {material: 80, clean: 20}
    detail: {density: 72}
    depth: {cinematic: 60}
    mood: {energy: 38}
  composition:
    depth: cinematic
    framing: 手持取景，轻微倾斜与裁切
  subjects: [人物, 建筑]
  models: [GPT Image, Midjourney, Flux]
  recipe:
    identity: 胶片纪实，日常而不摆拍
    line: 镜头本身的锐度，不做干预
    color: 低饱和暖灰，轻微偏绿
    lighting: 自然光，允许过曝与欠曝
    material: 135 胶片、过期卷
    texture: 明显颗粒与暗角
    character: 真实、松弛、不完美
    atmosphere: 日常、私密、时间感强
  negative: [studio lighting, retouched skin, hdr]
  reference_notes: 森山大道 / 家庭相册
  constraints:
    anchor: 主视觉即唯一锚点：颗粒强度、曝光容差与手持取景以它为准；不因主体变更而修正画质。
    bans:                      # 按优先级，前置到提示词
      - no studio lighting, no fill light
      - no skin retouching, no sharpening
      - no posing, the subject must not look at the camera
    fail_if:
      - no visible grain or vignetting
      - exposure is technically perfect across the frame
      - the frame is perfectly level with a centered subject
    pass: 应像一卷过期胶片上顺手拍下的一格，而不是一张作品。