.page-header.compact {
  padding: var(--space-12) 0 var(--space-6);
}

.filter-chips {
  margin: var(--space-5) 0 var(--space-8);
}

.molecule-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-3);
}

.molecule-grid.small {
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
}

.molecule-card {
  display: grid;
  grid-template-rows: 150px auto;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-large);
  background: var(--surface);
  box-shadow: var(--shadow-small);
  transition: border-color 150ms ease, transform 150ms var(--ease-out), box-shadow 150ms ease;
}

.molecule-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-medium);
  transform: translateY(-1px);
}

.molecule-card-art {
  display: grid;
  place-items: center;
  padding: var(--space-3);
  border-bottom: 1px solid var(--border);
  background: var(--background-subtle);
  background-image: radial-gradient(var(--grid-line) 1px, transparent 1px);
  background-size: 12px 12px;
  color: var(--text-subtle);
  overflow: hidden;
}

.molecule-card-art .structure {
  width: auto;
  max-width: 100%;
  max-height: 126px;
}

.molecule-card-body {
  display: grid;
  gap: 2px;
  padding: 10px 12px 12px;
  min-width: 0;
}

.molecule-card-body strong {
  overflow: hidden;
  font-size: 13.5px;
  font-weight: 600;
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow-wrap: anywhere;
}

.molecule-card-body .mono {
  color: var(--text-subtle);
  font-size: 12px;
}

.molecule-page {
  padding-bottom: var(--space-16);
}

.molecule-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-4) var(--space-8);
  padding: var(--space-6) 0 var(--space-8);
}

.molecule-header h1 {
  font-size: clamp(30px, 4.4vw, 44px);
  font-weight: 650;
  line-height: 1.08;
  letter-spacing: -0.035em;
  overflow-wrap: anywhere;
  text-wrap: balance;
}

.molecule-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  margin-top: var(--space-3);
  color: var(--text-muted);
  font-size: 15px;
}

.molecule-meta .separator {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.6;
}

.formula sub {
  font-size: 0.72em;
  line-height: 0;
}

.formula sup {
  font-size: 0.72em;
  line-height: 0;
}

.molecule-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.molecule-hero {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: var(--space-4);
  align-items: start;
}

.structure-panel {
  display: grid;
  margin: 0;
  overflow: hidden;
}

.structure-frame {
  display: grid;
  place-items: center;
  min-height: 340px;
  padding: var(--space-8);
  background-image: radial-gradient(var(--grid-line) 1.2px, transparent 1.2px);
  background-size: 16px 16px;
  color: var(--text-subtle);
}

.structure-frame .structure {
  width: auto;
  max-width: 100%;
  max-height: 440px;
}

.structure-panel figcaption {
  padding: var(--space-3) var(--space-5);
  border-top: 1px solid var(--border);
}

.structure-panel figcaption .chip {
  height: 24px;
  font-size: 12px;
}

@media (max-width: 900px) {
  .molecule-hero {
    grid-template-columns: minmax(0, 1fr);
  }

  .structure-frame {
    min-height: 240px;
    padding: var(--space-5);
  }
}

.featured-note .lead {
  max-width: 820px;
  color: var(--text);
  font-size: 16px;
  line-height: 1.7;
}

.featured-note .link-list {
  margin-top: var(--space-4);
}

.identifiers {
  display: grid;
  gap: var(--space-3);
}

.identifier {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: var(--space-4);
  align-items: start;
}

.identifier-label {
  padding-top: 8px;
  color: var(--text-muted);
  font-size: 13.5px;
}

@media (max-width: 640px) {
  .identifier {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-1);
  }
}

.amount-converter {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-4);
  padding: var(--space-5);
  max-width: 720px;
}

.names summary {
  cursor: pointer;
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
}

.name-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 6px var(--space-6);
  margin-top: var(--space-4);
  padding: 0;
  list-style: none;
  color: var(--text-muted);
  font-size: 13.5px;
}

.name-list li {
  overflow-wrap: anywhere;
}

.row-list {
  display: grid;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--border);
}

.row-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: 10px 4px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  transition: background-color 120ms ease;
}

.row-list a:hover {
  background: var(--background-subtle);
}

.row-list a > span:first-child {
  min-width: 0;
  overflow-wrap: anywhere;
}

.tool-links {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-3);
}

.tool-link {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  transition: border-color 150ms ease, background-color 150ms ease;
}

.tool-link:hover {
  border-color: var(--accent-border);
  background: var(--surface-raised);
}

.tool-link > .icon {
  margin-top: 2px;
  color: var(--accent-text);
}

.tool-link span {
  display: grid;
  gap: 2px;
}

.tool-link strong {
  font-size: 14px;
  font-weight: 600;
}

.tool-link small {
  color: var(--text-muted);
  font-size: 12.5px;
}

.external .chip .icon {
  color: var(--text-subtle);
}

.structure-query {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  margin: 8px 0 12px;
}

.structure-query svg {
  max-width: 220px;
  max-height: 120px;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
}

.structure-query .mono {
  max-width: 100%;
  overflow-wrap: anywhere;
  font-size: 13px;
}

.molecule-card .similarity {
  display: block;
  margin-top: 2px;
  font-size: 12px;
  color: var(--accent-text);
}