Function isLightColor

app.js:1969–1975

(hex)

}

function isLightColor(hex) {
  const rgb = hexToRgb(hex || "#000000");
  if (!rgb) return false;
  // Perceived luminance (0..1)
  const lum = (0.299 * rgb.r + 0.587 * rgb.g + 0.114 * rgb.b) / 255;
  return lum > 0.62;
}

function getContrastingColor(hex) {
  return isLightColor(hex) ? "#111827" : "#FFFFFF";