{
  "$description": "Brand: Fastmail (fastmail@1.0.0)",
  "color": {
    "swatches": {
      "$description": "Source-of-truth color swatches from palette fastmail@1.0.0",
      "fastmail-blue": {
        "$value": "#0067B9",
        "$type": "color",
        "$description": "Fastmail's primary action / CTA color — the dominant brand blue used for buttons, links, and primary affordances across the marketing site and product.\n"
      },
      "fastmail-blue-hover": {
        "$value": "#176BAD",
        "$type": "color",
        "$description": "Hover variant on the primary CTA."
      },
      "fastmail-blue-active": {
        "$value": "#296B9F",
        "$type": "color",
        "$description": "Pressed / active state of the primary blue."
      },
      "fastmail-deep-blue": {
        "$value": "#243959",
        "$type": "color",
        "$description": "The navy \"trust\" hue used as the footer background and as the brand-anchor identity color in marketing surfaces. Reads as \"secure, established\" against the lighter primary blue.\n"
      },
      "fastmail-lightblue": {
        "$value": "#69B3E7",
        "$type": "color",
        "$description": "The mid-light blue used in the footer flag-gradient and as the focus-ring / outline color on buttons.\n"
      },
      "fastmail-mellow-yellow": {
        "$value": "#FBF7EF",
        "$type": "color",
        "$description": "The warm off-white \"mellow\" surface — a paper-toned canvas used on marketing modules as the calm alternative to pure white.\n"
      },
      "fastmail-yellow": {
        "$value": "#FFC107",
        "$type": "color",
        "$description": "The saturated yellow used in the footer flag-gradient and for highlight accents.\n"
      },
      "fastmail-pink": {
        "$value": "#FFA0C3",
        "$type": "color",
        "$description": "The blush-pink accent that opens the footer flag-gradient — a softer, warmer counterpoint to the dominant blues.\n"
      },
      "fastmail-text": {
        "$value": "#1B1E20",
        "$type": "color",
        "$description": "Primary body-text color — a soft near-black with a slight cool tint that pairs with the deep-blue brand anchor.\n"
      },
      "fastmail-text-alt": {
        "$value": "#333E48",
        "$type": "color",
        "$description": "Alternate heading/text on lighter surfaces."
      },
      "fastmail-text-subtle": {
        "$value": "#5B646C",
        "$type": "color",
        "$description": "Subtle/secondary text on light surfaces."
      },
      "fastmail-text-extra-subtle": {
        "$value": "#70777E",
        "$type": "color",
        "$description": "Tertiary text and inactive labels."
      },
      "fastmail-border-light": {
        "$value": "#EAEBEC",
        "$type": "color",
        "$description": "Light border / divider on white surfaces."
      },
      "fastmail-border-medium": {
        "$value": "#D6D8DA",
        "$type": "color",
        "$description": "Mid-tone border on cards and inputs."
      },
      "fastmail-bg-alt": {
        "$value": "#F4F5F5",
        "$type": "color",
        "$description": "Alternate page-background tint (faint neutral surface)."
      },
      "fastmail-bg-focused": {
        "$value": "#E9EBEE",
        "$type": "color",
        "$description": "Selected / focused row tint."
      },
      "fastmail-white": {
        "$value": "#FFFFFF",
        "$type": "color",
        "$description": "Base page background."
      },
      "fastmail-success": {
        "$value": "#147B33",
        "$type": "color",
        "$description": "Success / send-confirmed (ui-color-successgreen-100)."
      },
      "fastmail-error": {
        "$value": "#B9031F",
        "$type": "color",
        "$description": "Error / destructive (ui-color-criticalred-100)."
      },
      "fastmail-warning": {
        "$value": "#CA3C08",
        "$type": "color",
        "$description": "Warning / snooze (ui-color-snoozeorange-100)."
      }
    }
  },
  "font": {
    "$description": "Typography roles mapped to font atoms",
    "heading": {
      "family": {
        "$value": [
          "proxima-nova",
          "Inter",
          "-apple-system",
          "BlinkMacSystemFont",
          "Segoe UI",
          "Helvetica Neue",
          "Helvetica",
          "Arial",
          "sans-serif"
        ],
        "$type": "fontFamily",
        "$description": "heading role → Proxima Nova (proxima-nova@1.0.0)"
      },
      "weight": {
        "400": {
          "$value": 400,
          "$type": "fontWeight"
        },
        "500": {
          "$value": 500,
          "$type": "fontWeight"
        },
        "600": {
          "$value": 600,
          "$type": "fontWeight"
        },
        "700": {
          "$value": 700,
          "$type": "fontWeight"
        },
        "$description": "Available font weights"
      }
    },
    "body": {
      "family": {
        "$value": [
          "proxima-nova",
          "Inter",
          "-apple-system",
          "BlinkMacSystemFont",
          "Segoe UI",
          "Helvetica Neue",
          "Helvetica",
          "Arial",
          "sans-serif"
        ],
        "$type": "fontFamily",
        "$description": "body role → Proxima Nova (proxima-nova@1.0.0)"
      },
      "weight": {
        "400": {
          "$value": 400,
          "$type": "fontWeight"
        },
        "500": {
          "$value": 500,
          "$type": "fontWeight"
        },
        "600": {
          "$value": 600,
          "$type": "fontWeight"
        },
        "700": {
          "$value": 700,
          "$type": "fontWeight"
        },
        "$description": "Available font weights"
      }
    },
    "mono": {
      "family": {
        "$value": [
          "JetBrainsMono Nerd Font",
          "JetBrains Mono",
          "Fira Code",
          "Menlo",
          "Monaco",
          "Consolas",
          "Liberation Mono",
          "monospace"
        ],
        "$type": "fontFamily",
        "$description": "mono role → JetBrainsMono Nerd Font (jetbrainsmono-nerdfont@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"
        },
        "$description": "Available font weights"
      }
    }
  },
  "$extensions": {
    "com.brand-atoms.rules": [
      {
        "type": "contrastRatio",
        "target": "text-primary",
        "severity": "error",
        "rationale": "WCAG 2.1 Level AA contrast requirement for body text. Fastmail Text (#1B1E20) on Fastmail White clears AA at ~17:1, matching the marketing site's accessibility floor.\n",
        "against": "background",
        "minRatio": 4.5,
        "standard": "WCAG-AA"
      },
      {
        "type": "contrastRatio",
        "target": "roles.colors.primary",
        "severity": "error",
        "rationale": "Fastmail Blue (#0067B9) on Fastmail White clears AA at ~5.6:1 — the brand uses #0067B9 specifically because a lighter blue would drop below AA on small body-text links. The CTA blue MUST stay AA-compliant on the white canvas.\n",
        "against": "background",
        "minRatio": 4.5,
        "standard": "WCAG-AA"
      },
      {
        "type": "colorChoice",
        "target": "roles.colors.primary",
        "severity": "error",
        "rationale": "Fastmail's primary CTA is one of the three blue-family tokens. The supporting flag colors (Pink, Light Blue, Yellow) belong in the marketing flag-gradient and as illustration accents — they are NOT CTA colors and lack the AA contrast that the primary affordance demands.\n",
        "allowed": [
          "fastmail-blue",
          "fastmail-blue-hover",
          "fastmail-blue-active"
        ],
        "forbidden": [
          "fastmail-lightblue",
          "fastmail-pink",
          "fastmail-yellow"
        ]
      },
      {
        "type": "forbiddenTreatment",
        "target": "logo",
        "severity": "error",
        "rationale": "Fastmail's wordmark is a single-color \"Fastmail\" set in Proxima Nova. Recolored, gradient, or shadowed treatments conflict with the brand's quietly confident, professional voice.\n",
        "treatments": [
          "stretched",
          "rotated",
          "recolored",
          "drop-shadow",
          "gradient-fill",
          "on-busy-photo"
        ]
      },
      {
        "type": "compositionConstraint",
        "target": "roles.colors.identity",
        "severity": "recommendation",
        "rationale": "The Deep Blue brand-anchor reads cleanest against the white and Mellow Yellow canvases, and forms the supporting role of the four-color flag gradient. Pairing it adjacent to the Error red or Warning orange status hues creates a chromatic conflict that competes with the trust-establishing intent of the navy.\n",
        "pairsWith": [
          "fastmail-white",
          "fastmail-mellow-yellow",
          "fastmail-pink",
          "fastmail-lightblue",
          "fastmail-yellow"
        ],
        "doesNotPairWith": [
          "fastmail-error",
          "fastmail-warning"
        ]
      },
      {
        "type": "contextRestriction",
        "target": "roles.colors.surface-warm",
        "severity": "recommendation",
        "rationale": "Mellow Yellow (#FBF7EF) is a marketing-surface paper tone — used on hero modules and editorial blocks to soften the page. The Fastmail product chrome (the actual webmail UI) is white-canvas-first; substituting Mellow Yellow into the product surface breaks the marketing/product visual contract.\n",
        "allowedContexts": [
          "marketing-site",
          "hero",
          "editorial"
        ],
        "forbiddenContexts": [
          "product-chrome",
          "error-state"
        ]
      },
      {
        "type": "fontPairing",
        "target": "typography.heading",
        "severity": "recommendation",
        "rationale": "Fastmail uses Proxima Nova for both heading and body. A 1.4× minimum size ratio preserves hierarchy when one family does double duty across the marketing site's fluid type scale (the site declares a --fluid-font-0 through --fluid-font-11 ramp).\n",
        "requires": "body",
        "minSizeRatio": 1.4
      },
      {
        "type": "enumMembership",
        "target": "typography.body.fontWeight",
        "severity": "recommendation",
        "rationale": "Fastmail's Proxima Nova use is restrained to four weights — Regular (400), Medium (500), Semibold (600), Bold (700). Lighter weights are not part of the brand's typographic voice; heavier-than-Bold conflicts with the professional, not-shouty visual register.\n",
        "allowed": [
          "400",
          "500",
          "600",
          "700"
        ]
      }
    ],
    "com.brand-atoms.assets": [],
    "com.brand-atoms.provenance": {
      "source": "https://www.fastmail.com/",
      "license": "Proprietary — All Rights Reserved",
      "attribution": "Fastmail and the Fastmail wordmark are trademarks of Fastmail Pty Ltd. Brand colors and identity guidance documented here are derived from the deployed stylesheet on fastmail.com on 2026-05-18 (--brand-color-*, --theme-*, --ui-color-* token families).\n",
      "importedDate": "2026-05-18",
      "notes": "Derived from live site CSS at https://www.fastmail.com on 2026-05-18; no public brand guide located. Fastmail's marketing site exposes a comprehensive brand-color token surface on the document root — the values here are the canonical brand-defining hues plus the baseline neutral ramp. The brand's primary typeface is Proxima Nova (licensed from Mark Simonson Studio) — referenced via the proxima-nova@1 atom; Inter@1 is the open-source rendering substitute when Proxima Nova is unavailable.\n"
    },
    "com.brand-atoms.references": {
      "palette": "fastmail@1.0.0",
      "fonts": {
        "heading": "proxima-nova@1.0.0",
        "body": "proxima-nova@1.0.0",
        "mono": "jetbrainsmono-nerdfont@1.0.0"
      }
    }
  }
}