.quarto-listing .thumbnail img {
  /* Keep both portrait posters and landscape slides visible in full. */
  object-fit: contain !important;
  background: white;
}

.presentation-precis {
  max-width: 52rem;
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
}

.pdf-viewer {
  width: 100%;
  max-width: 900px;
  border: 1px solid #d8dee3;
  background: #f5f6f7;
}

.pdf-viewer:focus-visible,
.pdf-viewer-viewport:focus-visible {
  outline: 2px solid var(--bs-primary);
  outline-offset: 3px;
}

.pdf-viewer[data-mode="poster"] {
  max-width: 960px;
}

.pdf-viewer-viewport {
  display: grid;
  place-items: start center;
  aspect-ratio: 16 / 9;
  overflow: auto;
  overscroll-behavior: contain;
}

.pdf-viewer[data-mode="poster"] .pdf-viewer-viewport {
  height: min(75vh, 900px);
  min-height: 360px;
  aspect-ratio: auto;
  /* Left alignment keeps the whole canvas reachable when zoomed. */
  display: block;
}

.pdf-viewer canvas {
  display: block;
  max-width: none;
  margin-inline: auto;
  background: white;
}

.pdf-viewer-controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem;
  border-top: 1px solid #d8dee3;
  background: white;
}

.pdf-viewer-controls button {
  min-width: 2.75rem;
  min-height: 2.75rem;
}

.pdf-viewer-position {
  min-width: 5rem;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.pdf-viewer-status {
  padding: 0 0.75rem;
  margin: 0.5rem 0;
}

.pdf-viewer-status:empty {
  display: none;
}