{
  "$schema": "https://design-tokens.org/schema.json",
  "meta": {
    "name": "elesur",
    "edition": "one",
    "source": "elesur brand book, edition one, september 2026",
    "note": "every contrast figure below is computed from the hex values with the WCAG 2.1 relative-luminance formula, not estimated. all 26 figures in the brand book were independently recomputed and all 26 matched to two decimal places."
  },
  "ground": {
    "sky": { "value": "#0A0C12", "role": "the page on dark" },
    "paper": { "value": "#F5F5F7", "role": "the page on light" }
  },
  "ramp": {
    "night-000": { "value": "#0A0C12", "role": "the page on dark", "onSky": 1.00, "onPaper": 17.95 },
    "night-050": { "value": "#101420", "role": "a raised surface", "onSky": 1.06, "onPaper": 16.87 },
    "night-100": { "value": "#171B27", "role": "a card", "onSky": 1.14, "onPaper": 15.78 },
    "night-200": { "value": "#222736", "role": "a hairline", "onSky": 1.31, "onPaper": 13.66 },
    "night-300": { "value": "#31363F", "role": "the unlit run", "onSky": 1.61, "onPaper": 11.15 },
    "night-400": { "value": "#4A4F5C", "role": "the unlit letters in the tube mark", "onSky": 2.39, "onPaper": 7.52 },
    "night-500": { "value": "#6E7482", "role": "the unlit letters in the solid mark", "onSky": 4.17, "onPaper": 4.30 },
    "night-600": { "value": "#8A8F98", "role": "secondary text", "onSky": 6.02, "onPaper": 2.98 },
    "night-700": { "value": "#B7BCC5", "role": "body on dark", "onSky": 10.25, "onPaper": 1.75 },
    "night-800": { "value": "#DCDEE4", "role": "headings on dark", "onSky": 14.53, "onPaper": 1.24 },
    "night-900": { "value": "#F5F5F7", "role": "the page on light", "onSky": 17.95, "onPaper": 1.00 }
  },
  "accent": {
    "light": { "value": "#FB006B", "role": "the sign, on dark", "onSky": 4.95, "onPaper": 3.63 },
    "light-deep": { "value": "#CD016C", "role": "the sign, on light", "onSky": 3.55, "onPaper": 5.05 }
  },
  "rules": {
    "textOnSky": "night 600 and lighter",
    "textOnPaper": "night 400 and darker",
    "accentText": "a short line or a button label, never a paragraph",
    "logotypeExempt": ["night-400", "night-500"]
  },
  "type": {
    "family": { "text": "General Sans", "notation": "system monospace", "wordmark": "drawn from Switzer 500, set by hand, not a font you set" },
    "display": { "size": 44, "weight": 600 },
    "heading": { "size": 24, "weight": 600 },
    "body": { "size": 16, "weight": 400 },
    "ui": { "size": 14, "weight": 500 },
    "caption": { "size": 12, "weight": 400 },
    "notation": { "size": 12, "weight": 400, "mono": true }
  },
  "mark": {
    "xHeightUnits": 100,
    "ascenderUnits": 128,
    "overshootUnits": 2.6,
    "tubeGaugeUnits": 4.5,
    "eCrossbarUnits": 13.7,
    "clearSpace": "half an x-height on every side, measured from the ink",
    "tubeFloorPx": 36,
    "tubeFloorMm": 12,
    "jumperRadiusUnits": 18
  },
  "motion": {
    "event": "ignition",
    "cuts": [0.0, 0.35, 0.55, 0.8],
    "rules": ["no fade, no glow, no flicker loop, hard cuts only", "once per visit", "honour reduced motion by showing the last frame"]
  }
}