.structures-header {
  margin-bottom: 1.5rem;
}

.structures-header h1 {
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--main-color);
}

/* Search bar */
.search-wrapper {
  max-width: 480px;
}

.search-wrapper .form-control {
  border-radius: 8px 0 0 8px;
  border: 1.5px solid var(--light-gray);
}

.search-wrapper .btn-search {
  border-radius: 0 8px 8px 0;
  background-color: var(--dark-gray);
  border: 1.5px solid var(--dark-gray);
  color: #fff;
}

.search-wrapper .btn-search:hover {
  background-color: var(--dusty-blue);
  border-color: var(--dusty-blue);
}

/* Structure card */
.structure-card {
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgb(0 0 0 / 0.1);
  background: #fff;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.structure-card-header {
  background-color: #1c3156;
  color: #fff;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.structure-card-header .pdb-id {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.structure-card-header .pdb-file {
  font-size: 0.82rem;
  color: #a8c4e0;
  text-decoration: none;
}

.structure-card-header .pdb-file:hover {
  color: #d0e6f8;
  text-decoration: underline;
}

.structure-card-body {
  padding: 1rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Quality metrics */
.metrics-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dark-gray);
  margin-bottom: 0.5rem;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
}

.metric-box {
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  padding: 0.5rem 0.25rem;
  text-align: center;
}

.metric-box .metric-name {
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--extra-light-gray);
  display: block;
  margin-bottom: 0.2rem;
}

.metric-box .metric-value {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--main-color);
}

/* Gene information */
.gene-info-section {
  flex: 1;
}

.gene-info-table {
  width: 100%;
  font-size: 0.82rem;
  border-collapse: separate;
  border-spacing: 0 0.35rem;
}

.gene-info-table td.gi-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dark-gray);
  white-space: nowrap;
  padding-right: 0.75rem;
  vertical-align: top;
  width: 1%;
}

.gene-info-table td.gi-value {
  color: var(--main-color);
  line-height: 1.4;
}

.gene-info-table td.gi-value a {
  color: #1c3156;
  font-weight: 600;
  text-decoration: none;
}

.gene-info-table td.gi-value a:hover {
  text-decoration: underline;
}

.synopsis-text {
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
  color: var(--dark-gray);
}

.synopsis-text.expanded {
  display: block;
  -webkit-line-clamp: unset;
}

.toggle-synopsis {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.75rem;
  color: var(--dusty-blue);
  cursor: pointer;
  margin-top: 0.2rem;
}

.toggle-synopsis:hover {
  text-decoration: underline;
}

/* Results count */
.results-count {
  font-size: 0.85rem;
  color: var(--dark-gray);
}

/* Pagination */
.page-link {
  color: var(--dark-gray);
  border-color: #dee2e6;
}

.page-item.active .page-link {
  background-color: #1c3156;
  border-color: #1c3156;
  color: #fff;
}

.page-link:hover {
  color: #1c3156;
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 3rem;
  color: var(--extra-light-gray);
}

.empty-state i {
  font-size: 3rem;
  margin-bottom: 1rem;
  display: block;
}

/* Spinner */
.structures-spinner {
  display: flex;
  justify-content: center;
  padding: 4rem;
}