/* Definition page (Direction B: two-column reference) */

.def-page {
  background: var(--g1);
  min-height: 100vh;
}

.def-container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* Breadcrumb bar */
.def-breadcrumb {
  border-bottom: 1px solid var(--g2);
  padding: 12px 0;
  background: #fff;
}
.def-breadcrumb__link {
  font-size: 0.8rem;
  color: var(--t-teal);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.def-breadcrumb__link:hover {
  text-decoration: underline;
}
.def-breadcrumb__sep {
  font-size: 0.8rem;
  color: var(--g2);
  margin: 0 4px;
}
.def-breadcrumb__current {
  font-size: 0.8rem;
  color: var(--g4);
  font-weight: 600;
}

/* Two-column layout */
.def-layout {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 0;
  background: #fff;
  border-radius: 8px;
  margin-top: 24px;
  margin-bottom: 48px;
  overflow: hidden;
  border: 1px solid var(--g2);
}

/* Main content column */
.def-main {
  padding: 32px 36px;
  border-right: 1px solid var(--g2);
}

.def-title {
  font-size: clamp(1.6rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--black);
  margin-bottom: 20px;
  line-height: 1.2;
}

/* Definition content inherits prose styles */
.def-content.prose p {
  font-size: 15px;
  line-height: 1.72;
  color: var(--black);
  margin-bottom: 14px;
}
.def-content.prose h2,
.def-content.prose h3,
.def-content.prose h4 {
  color: var(--black);
}
.def-content.prose a {
  color: var(--t-teal);
  text-decoration: none;
  border-bottom: 1px solid rgba(0,151,167,0.3);
}
.def-content.prose a:hover {
  border-bottom-color: var(--t-teal);
}

/* Lead definition block: first blockquote or first bold paragraph */
.def-content.prose blockquote {
  background: #F8F9FA;
  border-left: 3px solid var(--t-teal);
  border-radius: 0;
  padding: 16px 20px;
  margin: 0 0 20px;
}
.def-content.prose blockquote p {
  font-size: 15px;
  font-weight: 600;
  color: var(--dark);
  margin: 0;
  line-height: 1.55;
}

/* Sidebar */
.def-sidebar {
  padding: 24px 20px;
  background: #F8F9FA;
}

.def-meta-section {
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--g2);
}
.def-meta-section:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.def-meta-heading {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--g4);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

.def-meta-label {
  font-size: 0.78rem;
  color: var(--g3);
  margin-bottom: 2px;
}
.def-meta-value {
  font-size: 0.85rem;
  color: var(--dark);
  font-weight: 600;
  margin-bottom: 10px;
}

/* Related definitions list */
.def-related-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.def-related-link {
  display: block;
  font-size: 0.8rem;
  padding: 6px 10px;
  background: #fff;
  color: var(--dark);
  border-radius: 4px;
  border: 1px solid var(--g2);
  text-decoration: none;
}
.def-related-link:hover {
  border-color: var(--t-teal);
  color: var(--t-teal);
}
.def-related-link--active {
  background: var(--t-teal);
  color: #fff;
  border-color: var(--t-teal);
  font-weight: 600;
}

/* See also links */
.def-see-also {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.def-see-also a {
  font-size: 0.8rem;
  color: var(--t-teal);
  text-decoration: none;
  line-height: 1.8;
}
.def-see-also a:hover {
  text-decoration: underline;
}

/* Mobile: stack to single column */
@media (max-width: 767px) {
  .def-layout {
    grid-template-columns: 1fr;
    margin-top: 16px;
  }
  .def-main {
    padding: 24px 20px;
    border-right: none;
    border-bottom: 1px solid var(--g2);
  }
  .def-sidebar {
    padding: 20px;
  }
  .def-related-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
  }
  .def-related-link {
    padding: 4px 12px;
    border-radius: 14px;
  }
}

/* Reference page: sticky sidebar + ToC */
.ref-sidebar-sticky {
  position: sticky;
  top: 80px;
}

.ref-toc {
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.ref-toc-link {
  display: block;
  font-size: 0.8rem;
  padding: 5px 10px;
  color: var(--g4);
  border-left: 2px solid transparent;
  text-decoration: none;
  transition: color 0.15s, border-color 0.15s;
}
.ref-toc-link:hover {
  color: var(--dark);
}
.ref-toc-link--active {
  color: var(--t-teal);
  border-left-color: var(--t-teal);
  font-weight: 600;
}
.ref-toc-link--h3 {
  padding-left: 20px;
  font-size: 0.75rem;
}