// Stable distinct color per year for the year badge
export function badgeColorForYear(y) {
  const val = (y === undefined || y === null) ? '?' : y;
  if (val === '?' || Number.isNaN(Number(val))) {
    // Neutral slate for unknown years
    return 'background-color: hsl(215 16% 34%);';
  }
  const n = Number(val);
  const hue = ((n * 23) % 360 + 360) % 360; // spread hues deterministically
  return `background-color: hsl(${hue} 70% 42%);`;
}