/* ── Research Theme Cards ── */
.research-card {
  border: 1px solid #e0e0e0;
  border-radius: 4px;
  padding: 1.5rem;
  margin-bottom: 1.875rem;
}
.research-card .card-icon {
  color: #999e57;
  margin-right: 0.35rem;
}
.research-card .card-desc {
  margin-bottom: 0.75rem;
}

/* Fade-out preview for paper lists */
.papers-preview {
  position: relative;
  max-height: 14rem;
  overflow: hidden;
}
.papers-preview::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 6rem;
  background: linear-gradient(to bottom, rgba(255,255,255,0), rgba(255,255,255,1));
  pointer-events: none;
}
.papers-preview.expanded {
  max-height: none;
}
.papers-preview.expanded::after {
  display: none;
}

/* Expand/collapse link */
.expand-link {
  display: block;
  margin-top: 0.5rem;
  cursor: pointer;
  text-decoration: none;
  position: sticky;
  bottom: 0;
  background: white;
  padding: 0.75rem 0;
  margin-bottom: -1.5rem;
  padding-bottom: 2.5rem;
  border-top: 1px solid #eee;
  font-weight: 600;
  z-index: 1;
}
.expand-link .fa-chevron-down,
.expand-link .fa-chevron-up {
  margin-left: 0.25rem;
  font-size: 0.8em;
}

/* Sub-theme headings */
.research-card .subtheme-heading {
  font-family: 'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-weight: 800;
  font-size: 1.125rem;
  margin: 1.25rem 0 0.5rem 0;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid #eee;
}

.research-card .subtheme-desc {
  font-size: 0.95rem;
  color: #606060;
  margin: 0.25rem 0 0.75rem 0;
}

/* Paper list inside cards */
.research-card .paper-list {
  list-style: none;
  padding-left: 0;
  margin-bottom: 0;
}
.research-card .paper-list li {
  margin-bottom: 0.75rem;
}
.research-card .venue-badge {
  display: inline-block;
  font-size: 0.8rem;
  background: #f0f0e8;
  color: #666;
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  margin-left: 0.3rem;
  vertical-align: middle;
  white-space: nowrap;
}
.research-card .paper-authors {
  font-size: 0.95rem;
  color: #808080;
  line-height: 1.5;
}
.research-card .paper-links {
  font-size: 0.95rem;
  margin-top: 0.15rem;
}
.research-card .paper-links a {
  margin-right: 0.5rem;
}

/* Footer line for early work */
.research-footer {
  margin-top: 1.875rem;
  padding-top: 1rem;
  border-top: 1px solid #eee;
}