/* PM2.5 palette sampled from Snipaste_2026-08-22_23-34-46.png.
   Low concentration: blue-grey; middle: cream; high: coral-red. */
.color-bar,
.distribution-track {
  background: linear-gradient(
    90deg,
    #6289c1 0%,
    #87a0c5 10%,
    #a8b9c8 20%,
    #c7d3ca 30%,
    #dfe7cb 40%,
    #fafcc9 50%,
    #fad8a7 60%,
    #f7ba8c 70%,
    #f2956c 80%,
    #ea6e4e 90%,
    #e14937 100%
  );
}