:root{
  /* NPSA core palette */
  --npsa-merlin: #004d71;
  --npsa-woodpigeon: #7ba2b5;
  --npsa-raven: #b2b4b7;
  --npsa-black: #020304;

  /* NPSA secondary palette */
  --npsa-kingfisher: #2eacf7;
  --npsa-goldfinch: #f9af00;
  --npsa-magpie: #e11f21;
  --npsa-starling: #00248c;
  --npsa-woodpecker: #44195e;
  --npsa-green: #1c6b24;

  /* Useful tints for backgrounds and panels */
  --npsa-merlin-20: color-mix(in srgb, var(--npsa-merlin) 20%, white);
  --npsa-merlin-40: color-mix(in srgb, var(--npsa-merlin) 40%, white);
  --npsa-merlin-60: color-mix(in srgb, var(--npsa-merlin) 60%, white);

  /* Typography */
  --npsa-font-sans: "Helvetica Neue", Arial, sans-serif;
}

/* layout helpers */
.npsa-header {
  background-color: var(--npsa-merlin);
  border-bottom: 4px solid var(--npsa-merlin);
}

.npsa-title {
  letter-spacing: 1px;
}

.npsa-bg {
  background-color: #f3f2f1; /* OK to stay literal once */
  min-height: 100vh;
  font-family: var(--bs-font-sans-serif);
}

.npsa-section-title {
  color: var(--npsa-merlin);
}

.npsa-sticky {
  position: sticky;
  top: 20px;
  align-self: start;
  z-index: 10;
}

.npsa-scroll {
  max-height: calc(100vh - 350px);
  overflow-y: auto;
  padding-right: 5px;
}