.note-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.4em;
  height: 1.4em;
  margin-left: .1em;
  padding: 0;
  border: 0;
  background: transparent;
  color: #b76732;
  cursor: pointer;
  font: 1.05rem/1 Georgia, serif;
  vertical-align: super;
  text-decoration: none;
}
.note-trigger:hover { color: var(--ink); }
.note-trigger:focus-visible { outline: 1px solid var(--copper); outline-offset: 1px; }
.chart-note[popover] {
  position: fixed;
  inset: auto;
  width: min(23rem, calc(100vw - 32px));
  max-height: calc(100dvh - 32px);
  overflow-y: auto;
  margin: 0;
  padding: .85rem 1rem;
  border: 1px solid var(--line);
  border-top: 2px solid #b76732;
  background: var(--paper);
  color: var(--muted);
  box-shadow: 0 5px 22px #343b2c18;
  font: .8rem/1.6 var(--sans);
  text-align: left;
  text-transform: none;
  letter-spacing: normal;
}
.chart-note::backdrop { background: transparent; }
.chart-note p { margin: 0; font: inherit; }
.chart-note p + p { margin-top: .6rem; }
.chart-note a { color: var(--green); }
@media (prefers-reduced-motion: no-preference) {
  .chart-note:popover-open { animation: note-appear .12s ease-out; }
  @keyframes note-appear { from { opacity: 0; } to { opacity: 1; } }
}