{
  "$description": "Brand: Go — dark mode",
  "color": {
    "swatches": {
      "$description": "Source-of-truth color swatches from palette golang@1.0.0",
      "gopher-blue": {
        "$value": "#00ADD8",
        "$type": "color",
        "$description": "Primary brand color — the signature cyan that anchors the Go gopher, the wordmark, and primary calls-to-action. PANTONE 638C.\n"
      },
      "light-blue": {
        "$value": "#5DC9E2",
        "$type": "color",
        "$description": "Supporting tint used in gradients and secondary surfaces. PANTONE 310U.\n"
      },
      "fuchsia": {
        "$value": "#CE3262",
        "$type": "color",
        "$description": "Secondary brand color — accent for callouts, highlights, and \"what NOT to do\" markers in the Brand Book. PANTONE 7635C.\n"
      },
      "aqua": {
        "$value": "#00A29C",
        "$type": "color",
        "$description": "Secondary brand color — teal accent used in the Go gradient and supporting illustrations. PANTONE 3265C.\n"
      },
      "go-black": {
        "$value": "#000000",
        "$type": "color",
        "$description": "High-contrast foundation — used as a canvas under the white gopher mark and for primary text on light surfaces. PANTONE Black C.\n"
      },
      "go-yellow": {
        "$value": "#FDDD00",
        "$type": "color",
        "$description": "Tertiary accent used sparingly for spotlight callouts. PANTONE Yellow C.\n"
      },
      "dark-cyan": {
        "$value": "#00758D",
        "$type": "color",
        "$description": "PANTONE 3145C — deeper cyan for hover states and shadows."
      },
      "cool-gray": {
        "$value": "#555759",
        "$type": "color",
        "$description": "PANTONE 425C — neutral text and dividers."
      },
      "plum": {
        "$value": "#402B56",
        "$type": "color",
        "$description": "PANTONE 669C — deep accent for tertiary surfaces."
      },
      "light-gray": {
        "$value": "#DBD9D6",
        "$type": "color",
        "$description": "PANTONE Cool Gray 1C — light hairline surfaces."
      },
      "go-white": {
        "$value": "#FFFFFF",
        "$type": "color",
        "$description": "Page canvas in light mode; reversed mark color on Black."
      }
    },
    "roles": {
      "$description": "Semantic color roles (dark mode) mapped to palette swatches",
      "background": {
        "$value": "{color.swatches.go-black}",
        "$type": "color",
        "$description": "background role → Black"
      },
      "surface": {
        "$value": "{color.swatches.plum}",
        "$type": "color",
        "$description": "surface role → Plum"
      },
      "surface-elevated": {
        "$value": "{color.swatches.cool-gray}",
        "$type": "color",
        "$description": "surface-elevated role → Cool Gray"
      },
      "text-primary": {
        "$value": "{color.swatches.go-white}",
        "$type": "color",
        "$description": "text-primary role → White"
      },
      "text-secondary": {
        "$value": "{color.swatches.light-gray}",
        "$type": "color",
        "$description": "text-secondary role → Light Gray"
      },
      "text-tertiary": {
        "$value": "{color.swatches.light-blue}",
        "$type": "color",
        "$description": "text-tertiary role → Light Blue"
      },
      "primary": {
        "$value": "{color.swatches.gopher-blue}",
        "$type": "color",
        "$description": "primary role → Gopher Blue"
      },
      "primary-hover": {
        "$value": "{color.swatches.light-blue}",
        "$type": "color",
        "$description": "primary-hover role → Light Blue"
      },
      "accent": {
        "$value": "{color.swatches.fuchsia}",
        "$type": "color",
        "$description": "accent role → Fuchsia"
      },
      "accent-hover": {
        "$value": "{color.swatches.light-blue}",
        "$type": "color",
        "$description": "accent-hover role → Light Blue"
      },
      "warning": {
        "$value": "{color.swatches.go-yellow}",
        "$type": "color",
        "$description": "warning role → Yellow"
      },
      "warning-hover": {
        "$value": "{color.swatches.fuchsia}",
        "$type": "color",
        "$description": "warning-hover role → Fuchsia"
      },
      "error": {
        "$value": "{color.swatches.fuchsia}",
        "$type": "color",
        "$description": "error role → Fuchsia"
      },
      "success": {
        "$value": "{color.swatches.aqua}",
        "$type": "color",
        "$description": "success role → Aqua"
      },
      "brand-overrides": {
        "$description": "Brand-level role overrides (take precedence over palette role mappings)",
        "identity": {
          "$value": "{color.swatches.gopher-blue}",
          "$type": "color",
          "$description": "Brand role identity → Gopher Blue"
        },
        "on-identity": {
          "$value": "{color.swatches.go-white}",
          "$type": "color",
          "$description": "Brand role on-identity → White"
        },
        "primary": {
          "$value": "{color.swatches.gopher-blue}",
          "$type": "color",
          "$description": "Brand role primary → Gopher Blue"
        },
        "primary-hover": {
          "$value": "{color.swatches.dark-cyan}",
          "$type": "color",
          "$description": "Brand role primary-hover → Dark Cyan"
        },
        "accent": {
          "$value": "{color.swatches.fuchsia}",
          "$type": "color",
          "$description": "Brand role accent → Fuchsia"
        },
        "accent-hover": {
          "$value": "{color.swatches.plum}",
          "$type": "color",
          "$description": "Brand role accent-hover → Plum"
        },
        "background": {
          "$value": "{color.swatches.go-white}",
          "$type": "color",
          "$description": "Brand role background → White"
        },
        "surface": {
          "$value": "{color.swatches.light-gray}",
          "$type": "color",
          "$description": "Brand role surface → Light Gray"
        },
        "text-primary": {
          "$value": "{color.swatches.go-black}",
          "$type": "color",
          "$description": "Brand role text-primary → Black"
        },
        "text-secondary": {
          "$value": "{color.swatches.cool-gray}",
          "$type": "color",
          "$description": "Brand role text-secondary → Cool Gray"
        }
      }
    }
  },
  "font": {
    "$description": "Typography roles mapped to font atoms",
    "heading": {
      "family": {
        "$value": [
          "Work Sans",
          "-apple-system",
          "BlinkMacSystemFont",
          "Segoe UI",
          "Roboto",
          "Helvetica Neue",
          "Arial",
          "sans-serif"
        ],
        "$type": "fontFamily",
        "$description": "heading role → Work Sans (work-sans@1.0.0)"
      },
      "weight": {
        "100": {
          "$value": 100,
          "$type": "fontWeight"
        },
        "200": {
          "$value": 200,
          "$type": "fontWeight"
        },
        "300": {
          "$value": 300,
          "$type": "fontWeight"
        },
        "400": {
          "$value": 400,
          "$type": "fontWeight"
        },
        "500": {
          "$value": 500,
          "$type": "fontWeight"
        },
        "600": {
          "$value": 600,
          "$type": "fontWeight"
        },
        "700": {
          "$value": 700,
          "$type": "fontWeight"
        },
        "800": {
          "$value": 800,
          "$type": "fontWeight"
        },
        "900": {
          "$value": 900,
          "$type": "fontWeight"
        },
        "$description": "Available font weights"
      }
    },
    "body": {
      "family": {
        "$value": [
          "Roboto",
          "-apple-system",
          "BlinkMacSystemFont",
          "Segoe UI",
          "Helvetica Neue",
          "Arial",
          "sans-serif"
        ],
        "$type": "fontFamily",
        "$description": "body role → Roboto (roboto@1.0.0)"
      },
      "weight": {
        "100": {
          "$value": 100,
          "$type": "fontWeight"
        },
        "300": {
          "$value": 300,
          "$type": "fontWeight"
        },
        "400": {
          "$value": 400,
          "$type": "fontWeight"
        },
        "500": {
          "$value": 500,
          "$type": "fontWeight"
        },
        "700": {
          "$value": 700,
          "$type": "fontWeight"
        },
        "900": {
          "$value": 900,
          "$type": "fontWeight"
        },
        "$description": "Available font weights"
      }
    },
    "mono": {
      "family": {
        "$value": [
          "Source Code Pro",
          "ui-monospace",
          "SFMono-Regular",
          "Menlo",
          "Consolas",
          "Liberation Mono",
          "monospace"
        ],
        "$type": "fontFamily",
        "$description": "mono role → Source Code Pro (source-code-pro@1.0.0)"
      },
      "weight": {
        "200": {
          "$value": 200,
          "$type": "fontWeight"
        },
        "300": {
          "$value": 300,
          "$type": "fontWeight"
        },
        "400": {
          "$value": 400,
          "$type": "fontWeight"
        },
        "500": {
          "$value": 500,
          "$type": "fontWeight"
        },
        "600": {
          "$value": 600,
          "$type": "fontWeight"
        },
        "700": {
          "$value": 700,
          "$type": "fontWeight"
        },
        "800": {
          "$value": 800,
          "$type": "fontWeight"
        },
        "900": {
          "$value": 900,
          "$type": "fontWeight"
        },
        "$description": "Available font weights"
      }
    }
  }
}