:root {
  --talk-border-color: #dee2e6;
  --talk-muted-color: #6c757d;
  --talk-link-hover-bg: #e9ecef;
  --talk-link-active-bg: #993399;
  --talk-link-active-fg: #fff;
  --talk-link-active-fg-muted: rgba(255, 255, 255, 0.8);
}

.talks-layout {
  display: grid;
  grid-template-columns: 1fr 3fr;
  gap: 1.5rem;
  height: 80vh;
}

.talks-list {
  border-right: 1px solid var(--talk-border-color);
  padding-right: 1rem;
  overflow-y: auto;
}

.talks-list-header {
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--talk-muted-color);
  margin-bottom: 0.5rem;
}

.talks-list ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.talk-item {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-bottom: 0.25rem;
}

.talks-list .talk-link {
  flex: 1;
  display: block;
  padding: 0.5rem 0.75rem;
  border-radius: 0.375rem;
  text-decoration: none;
  line-height: 1.4;
}

.talks-list .talk-link:hover {
  background: var(--talk-link-hover-bg);
}

.talks-list .talk-link.active {
  background: var(--talk-link-active-bg);
  color: var(--talk-link-active-fg);
}

.talks-list .talk-link.active small {
  color: var(--talk-link-active-fg-muted);
}

.talks-list .talk-link[data-pdf^="http"] small::after {
  content: " · download only";
  color: var(--talk-muted-color);
  font-style: italic;
}

.talks-list .talk-link.active[data-pdf^="http"] small::after {
  color: var(--talk-link-active-fg-muted);
}

.talk-download {
  flex-shrink: 0;
  padding: 0.25rem 0.5rem;
  border-radius: 0.375rem;
  text-decoration: none;
  font-size: 0.9rem;
  color: var(--talk-muted-color);
}

.talk-download:hover {
  background: var(--talk-link-hover-bg);
}

.pdf-viewer {
  height: 100%;
}

.pdf-placeholder {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--talk-muted-color);
  border: 1px dashed var(--talk-border-color);
  border-radius: 0.375rem;
}

#pdf-frame {
  border: none;
  height: 100%;
  width: 100%;
  border-radius: 0.375rem;
}