/* ==========================================================
   Ponto — annotated screens
   The screen stays clean. Numbered marks sit in a rail beside it,
   and the notes are HTML text next to the screen (or below, on phones).
   Marks: square, 2px radius, like glyph cells at rest. No shadows.
   ========================================================== */

.annot {
  margin: 0;
  padding-block: var(--s2);
  display: grid;
  grid-template-columns: minmax(0, max-content) minmax(0, 1fr);
  gap: var(--s3) var(--s4);
  align-items: start;
}
.annot > figcaption {
  grid-column: 1 / -1;
  font-size: var(--fs-meta);
  line-height: var(--lh-meta);
  color: var(--text-2);
  max-width: var(--measure-ui);
}

/* Stage: rail of marks + the screen */
.annot-stage {
  display: grid;
  grid-template-columns: 40px minmax(0, var(--w, 364px));
  column-gap: var(--s1);
}
.annot-rail { position: relative; }
.annot-screen { position: relative; }
.annot-screen img { display: block; width: 100%; height: auto; }

/* A mark: a vertical bar the height of the region, with its number */
.annot-mark {
  position: absolute;
  right: 0;
  top: var(--t);
  height: var(--h);
  width: 40px;
  padding: 0;
  border: 0;
  background: none;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--s1);
  cursor: pointer;
}
.annot-mark::after {                /* the bar */
  content: "";
  flex: none;
  align-self: stretch;
  width: 2px;
  background: var(--hairline);
  transition: background-color var(--dur-fast) var(--ease-out);
}
.annot-num {
  flex: none;
  display: inline-grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border: var(--rule);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
  font-size: var(--fs-meta);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  transition: background-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.annot-mark:hover .annot-num { border-color: var(--ink); }
.annot-mark:focus-visible { outline-offset: 0; }

/* The region on the screen that the active note talks about */
.annot-region {
  position: absolute;
  left: 0; right: 0;
  top: var(--t);
  height: var(--h);
  /* screens are always light, so the outline uses the light-theme ink in both themes */
  outline: 2px solid #1A2422;
  outline-offset: -2px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-fast) var(--ease-out);
}

/* Active state, shared by both modes */
.annot [data-n].is-active .annot-num,
.annot-notes li.is-active .annot-num { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.annot-mark.is-active::after { background: var(--ink); }
.annot-region.is-active { opacity: 1; }

/* Notes */
.annot-notes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--s3);
  max-width: 40ch;
}
.annot-notes li {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  column-gap: var(--s2);
  align-items: start;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  cursor: default;
  transition: color var(--dur-fast) var(--ease-out);
}
.annot-notes li .annot-num { margin-top: 3px; }
.annot-notes strong { font-weight: 500; }

/* Large screens: every note is visible; pointing at one quiets the others */
.annot.has-active .annot-notes li:not(.is-active) { color: var(--text-2); }

/* Small screens: one note at a time, in a strip that stays at the bottom
   of the window while the screen is in view. Tapping a number changes it. */
@media (max-width: 640px) {
  .annot { grid-template-columns: minmax(0, 1fr); row-gap: 0; }
  .annot > figcaption { margin-top: var(--s2); }
  .annot-notes {
    max-width: none;
    position: sticky;
    bottom: 0;
    z-index: 1;
    padding-block: var(--s2);
    background: var(--paper);
    border-top: var(--rule);
  }
  .annot-notes li { display: none; }
  .annot-notes li.is-active { display: grid; }
  .annot.has-active .annot-notes li:not(.is-active) { color: inherit; }
}

@media (prefers-reduced-motion: reduce) {
  .annot-mark::after, .annot-num, .annot-region, .annot-notes li { transition: none; }
}