style:
  id: rough-notebook
  name: 草稿本
  name_en: Rough Notebook
  category: [手绘, 人物, 产品]
  visual_dna:
    line: {organic: 92, precision: 8}
    color: {saturation: 26, warmth: 74}
    lighting: {softness: 55, contrast: 45}
    texture: {material: 70, clean: 30}
    detail: {density: 81}
    depth: {cinematic: 28}
    mood: {energy: 70}
  composition:
    depth: flat
    framing: 松散的编辑式构图，主体偏置
  subjects: [人物, 产品]
  models: [GPT Image, Flux]
  recipe:
    identity: 草稿本上未完成的念头
    line: 单程钢笔线，不做修改
    color: 纸白 + 石墨灰，近乎单色
    lighting: 平光，无明显方向
    material: 笔记本纸、圆珠笔与铅笔
    texture: 干墨颗粒与压痕
    character: 俏皮、笨拙、比例不准
    atmosphere: 好奇、未完成、思考中
  negative: [clean vector, 3d render, glossy]
  reference_notes: 设计过程稿 / 会议白板记录
  constraints:
    anchor: 主视觉即唯一锚点：线宽、纸色与留白比例以它为准；新增内容只能延续同一支笔的手感。
    bans:                      # 按优先级，前置到提示词
      - no pen switching, no second pass over a line
      - no area color fill
      - no ruler-straight alignment, no evenly spaced layout
    fail_if:
      - line ends show a deliberate hook or taper
      - subject is fully centered with symmetrical margins
      - no correction marks or re-drawn strokes anywhere
    pass: 应像一张从笔记本上撕下来、还没画完的页面。