{
  fontStack: {
    system: {
      $value: "'Mona Sans VF', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji'",
      $type: 'fontFamily',
      $description: 'Mona Sans–first font stack with system fallbacks, optimized for cross-platform rendering. Primary font stack for all UI text where Mona Sans is available.',
      $extensions: {
        'org.primer.figma': {
          collection: 'typography',
          scopes: ['fontFamily'],
        },
      },
    },
    sansSerif: {
      $value: "'Mona Sans VF', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji'",
      $type: 'fontFamily',
      $description: 'Sans-serif font stack for body text and general UI elements.',
      $extensions: {
        'org.primer.figma': {
          collection: 'typography',
          scopes: ['fontFamily'],
        },
        'org.primer.llm': {
          usage: ['body-text', 'form-inputs', 'labels', 'paragraphs'],
          rules: 'Default font stack for all UI text. Use for body text and standard UI elements. MUST use for readable content.',
        },
      },
    },
    sansSerifDisplay: {
      $value: "'Mona Sans VF', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji'",
      $type: 'fontFamily',
      $description: 'Display font stack for headings and titles. Same as sansSerif but semantically distinct.',
      $extensions: {
        'org.primer.figma': {
          collection: 'typography',
          scopes: ['fontFamily'],
        },
        'org.primer.llm': {
          usage: ['heading', 'title', 'display-text', 'hero-text'],
          rules: 'Use for headings and display text. Prefer over sansSerif for titles.',
        },
      },
    },
    monospace: {
      $value: 'ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace',
      $type: 'fontFamily',
      $description: 'Monospace font stack for code, technical content, and tabular data.',
      $extensions: {
        'org.primer.figma': {
          collection: 'typography',
          scopes: ['fontFamily'],
        },
        'org.primer.llm': {
          usage: ['code-block', 'inline-code', 'terminal', 'technical-data', 'tabular-numbers'],
          rules: 'MUST use for all code display. Use for technical content requiring fixed-width characters.',
        },
      },
    },
  },
}