style:
  id: chalk-lector
  name: 粉笔板书
  name_en: Chalk Lector
  category: [手绘, 产品, 人物]
  visual_dna:
    line: {organic: 84, precision: 16}
    color: {saturation: 30, warmth: 70}
    lighting: {softness: 60, contrast: 40}
    texture: {material: 88, clean: 12}
    detail: {density: 76}
    depth: {cinematic: 34}
    mood: {energy: 48}
  composition:
    depth: flat
    framing: 板书式排布，允许箭头与圈注
  subjects: [产品, 人物]
  models: [GPT Image, Flux]
  recipe:
    identity: 黑板粉笔讲解图
    line: 粉笔的断续与重描
    color: 白、浅黄、淡红三色粉笔
    lighting: 教室顶光，黑板轻微反光
    material: 黑板、粉笔、干性色粉
    texture: 粉末与擦痕
    character: 图解化、几何、说明性
    atmosphere: 理性、克制、有教学感
  negative: [glossy, neon, 3d render, photo]
  reference_notes: 物理课堂板书 / 老教材插图
  constraints:
    anchor: 主视觉即唯一锚点：粉笔线形态、三色限制与擦痕密度以它为准；新知识点不得画得更干净。
    bans:                      # 按优先级，前置到提示词
      - no smooth continuous strokes
      - no more than three colors in total
      - no glossy surfaces, no reflections
    fail_if:
      - no eraser smudges or chalk dust
      - no arrows, circles or leader lines interrupt the layout
      - lines close cleanly with sharp edges
    pass: 应像一堂课讲完后留在黑板上的图解，可以被拍照带走。