{
  "version": "1.2",
  "date": "2026-10-24",
  "color": {
    "ember-black": "#0D0A0A",
    "ash": "#F4EFEA",
    "cardinal": "#CC1E38",
    "smoke": "#A39A94",
    "stone": "#6E6560",
    "surface": "#161010",
    "surface-2": "#1D1414",
    "line": "#2A1D1C",
    "petrol": {
      "value": "#1E4F4C",
      "backup_only": true
    },
    "petrol-light": {
      "value": "#5FB8AE",
      "backup_only": true
    }
  },
  "contrast": {
    "ash/ember-black": 17.3,
    "cardinal/ash": 4.8,
    "ash/cardinal": 4.8,
    "cardinal/ember-black": 3.6,
    "smoke/ember-black": 7.1,
    "smoke/surface": 6.8,
    "stone/ash": 5.0,
    "ember-black/cardinal": 3.6
  },
  "font": {
    "sans": {
      "family": "Host Grotesk",
      "file": "fonts/HostGrotesk-VF.woff2",
      "fallback_file": "fonts/HostGrotesk-VF.ttf",
      "weights": [
        400,
        500,
        600,
        700
      ],
      "axis": "wght 300-800",
      "license": "OFL",
      "self_hosted": true,
      "fallbacks": [
        "HG Fallback (Arial or Liberation Sans with size-adjust 104.5% regular, 99.5% bold, so text wraps the same before the web font loads)"
      ]
    }
  },
  "type_scale_web": {
    "display": "64/1.03 -0.025em",
    "h1": "58/1.03 -0.025em",
    "h2": "52/1.03 -0.025em",
    "h3": "26/1.15 -0.015em",
    "body": "18/1.55",
    "small": "14/1.5"
  },
  "type_scale_mobile": {
    "display": 40,
    "h1": 36,
    "h2": 32,
    "h3": 22,
    "body": 17,
    "small": 14
  },
  "radius": {
    "card": 6,
    "button": 8
  },
  "icons": {
    "set": "Phosphor",
    "weights": [
      "regular",
      "bold"
    ],
    "delivery": "inline SVG, never a CDN stylesheet",
    "never": [
      "duotone",
      "red icons",
      "Lucide"
    ],
    "card_rule": "no icon on top of cards; icons only where they help orientation, small, in text color"
  },
  "accent_word": "one word or short phrase per headline in Cardinal, same font and weight, no underline, never italic or serif",
  "banned": {
    "fonts": [
      "Inter",
      "Roboto",
      "Arial (as main face)",
      "Helvetica (as main face)",
      "Open Sans",
      "Lato",
      "Montserrat",
      "Poppins",
      "Geist",
      "Space Grotesk",
      "DM Sans",
      "Plus Jakarta Sans",
      "Manrope",
      "Outfit",
      "Sora",
      "Satoshi",
      "Clash Display",
      "General Sans",
      "Cabinet Grotesk",
      "Syne",
      "Instrument Sans",
      "Instrument Serif",
      "Playfair Display",
      "Bricolage Grotesque",
      "Bodoni Moda"
    ],
    "elements": [
      "eyebrows",
      "badge above H1",
      "serif italic accent",
      "all caps",
      "gradients",
      "purple",
      "glassmorphism",
      "icon card grids",
      "stat banners",
      "numbered step circles",
      "emojis",
      "pill buttons",
      "external font or icon CDNs",
      "cursor effects",
      "dot grids"
    ]
  },
  "exceptions": [
    "dark ground is the default",
    "the light trail may glow",
    "hero H1 may use the contrast form 'doesn't need X. It needs momentum.'",
    "tiles may tilt up to 3 degrees toward the pointer on desktop"
  ],
  "formats": [
    "Momentum Workshop (one day)",
    "Momentum Project (four to twelve weeks)",
    "Momentum Advisory (monthly)"
  ],
  "contrast_note": "Contrast is symmetric: Cardinal on Ember Black and Ember Black on Cardinal are both 3.6:1. Large elements only, never small text."
}