.tdmu-article-detail-section {
  padding-top: 3rem;
}

.tdmu-article-detail-shell .tdmu-article-detail-sidebar {
  position: sticky;
  top: calc(var(--header-total-height, 120px) + 1rem);
  max-height: calc(100vh - var(--header-total-height, 120px) - 1.5rem);
  overflow-y: auto;
}

.tdmu-article-feature-panel {
  border: 1px solid var(--tdmu-border);
  background: var(--tdmu-surface);
  padding: 1.1rem;
}

.tdmu-article-feature-header {
  margin-bottom: 1.15rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--tdmu-border-light);
}

.tdmu-article-feature-title {
  margin: 0.42rem 0 0;
  font-size: clamp(30px, 3vw, 44px);
  line-height: 1.1;
  color: var(--tdmu-text);
  font-weight: 700;
}

.tdmu-article-feature-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.52rem;
  margin-top: 0.75rem;
}

.tdmu-article-feature-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  border: 1px solid var(--tdmu-border-light);
  background: var(--tdmu-surface);
  color: var(--tdmu-text-secondary);
  font-size: 0.84rem;
  font-weight: 600;
  padding: 0.26rem 0.56rem;
}

.tdmu-article-feature-chip--category {
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--tdmu-primary);
  font-weight: 700;
  background: rgba(var(--tdmu-accent-rgb), 0.12);
  border-color: rgba(var(--tdmu-accent-rgb), 0.2);
}

.tdmu-article-feature-cover {
  width: 100%;
  object-fit: cover;
  max-height: 470px;
}

.tdmu-article-feature-body {
  max-width: 100%;
}

.tdmu-article-feature-content {
  font-size: 1.04rem;
  line-height: 1.85;
  color: var(--tdmu-text-secondary);
}

.tdmu-article-feature-content p {
  margin-bottom: 1rem;
}

.tdmu-article-feature-content figure {
  margin: 1.2rem 0 1.35rem;
}

.tdmu-article-feature-content img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--tdmu-border);
}

.tdmu-article-feature-content figcaption {
  margin-top: 0.45rem;
  padding-left: 0.85rem;
  border-left: 3px solid rgba(var(--tdmu-accent-rgb), 0.45);
  color: var(--tdmu-text-secondary);
  font-size: 0.96rem;
  line-height: 1.65;
}

.tdmu-article-feature-content h3 {
  margin-top: 1.75rem;
  margin-bottom: 0.85rem;
  color: var(--tdmu-text);
  font-size: clamp(22px, 2.1vw, 30px);
}

.tdmu-article-feature-content h4 {
  margin-top: 1.35rem;
  margin-bottom: 0.75rem;
  color: var(--tdmu-primary);
  font-size: 1.26rem;
}

.tdmu-article-feature-content ul,
.tdmu-article-feature-content ol {
  padding-left: 1.1rem;
}

.tdmu-article-feature-content li + li {
  margin-top: 0.28rem;
}

.tdmu-article-feature-content table {
  width: 100%;
  margin: 1rem 0;
  border-collapse: collapse;
}

.tdmu-article-feature-content th,
.tdmu-article-feature-content td {
  border: 1px solid var(--tdmu-border);
  padding: 0.65rem 0.75rem;
  text-align: left;
}

.tdmu-article-feature-content th {
  background: rgba(var(--tdmu-primary-rgb), 0.06);
  color: var(--tdmu-primary);
}

.tdmu-article-feature-content blockquote {
  border-left: 3px solid rgba(var(--tdmu-primary-rgb), 0.45);
  padding: 0.2rem 0 0.2rem 0.82rem;
  margin: 1.35rem 0;
  color: var(--tdmu-text-secondary);
  font-style: italic;
}

.tdmu-article-detail-sidebar .tdmu-listing-filter,
.tdmu-article-detail-sidebar .tdmu-listing-filter-option {
  display: block;
  text-decoration: none;
}

.tdmu-article-related {
  margin-top: 1.5rem;
  border: 1px solid var(--tdmu-border);
  background: var(--tdmu-surface);
  padding: 1rem;
}

.tdmu-article-related-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.tdmu-article-related-head--stack {
  align-items: start;
}

.tdmu-article-related-kicker {
  margin: 0 0 0.25rem;
  color: var(--tdmu-accent);
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tdmu-article-related-controls {
  display: flex;
  gap: 0.45rem;
}

.tdmu-article-related-nav {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(var(--tdmu-primary-rgb), 0.14);
  background: var(--tdmu-surface);
  color: var(--tdmu-primary);
}

.tdmu-article-related-nav:disabled {
  opacity: 0.4;
  pointer-events: none;
}

.tdmu-article-related-viewport {
  overflow: hidden;
}

.tdmu-article-related-rail {
  display: flex;
  gap: 1rem;
  transition: transform var(--transition-base);
  will-change: transform;
}

.tdmu-article-related-card {
  flex: 0 0 calc((100% - 3rem) / 4);
  min-width: 0;
  border: 1px solid rgba(var(--tdmu-primary-rgb), 0.1);
  background: var(--tdmu-surface);
}

.tdmu-article-related-card-media {
  display: block;
}

.tdmu-article-related-card-image {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  display: block;
}

.tdmu-article-related-card-body {
  padding: 0.8rem 0.85rem 0.95rem;
}

.tdmu-article-related-card-meta {
  margin: 0 0 0.35rem;
  color: var(--tdmu-text-secondary);
  font-size: 0.84rem;
}

.tdmu-article-related-card-title {
  margin: 0;
  font-size: 1.02rem;
  line-height: 1.5;
}

.tdmu-article-related-card-title a {
  color: var(--tdmu-primary);
}

.tdmu-article-related-card-title a:hover {
  color: var(--tdmu-accent);
}

.tdmu-article-related-list {
  display: grid;
}

.tdmu-article-related-list-item {
  padding: 1rem 0;
  border-bottom: 1px solid rgba(var(--tdmu-primary-rgb), 0.12);
}

.tdmu-article-related-list-item:first-child {
  padding-top: 0;
}

.tdmu-article-related-list-item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.tdmu-article-related-list-title {
  display: block;
  color: var(--tdmu-primary);
  font-size: 1.04rem;
  font-weight: 600;
  line-height: 1.55;
  text-decoration: none;
}

.tdmu-article-related-list-title:hover {
  color: var(--tdmu-accent);
}

.tdmu-article-related-list-meta {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.35rem;
  color: var(--tdmu-text-secondary);
  font-size: 0.89rem;
}

@media (max-width: 1199.98px) {
  .tdmu-article-related-card {
    flex-basis: calc((100% - 1rem) / 2);
  }
}

@media (max-width: 767.98px) {
  .tdmu-article-detail-shell .tdmu-article-detail-sidebar {
    position: static;
    top: auto;
    max-height: none;
    overflow-y: visible;
  }

  .tdmu-article-related-head {
    display: grid;
  }

  .tdmu-article-related-controls {
    justify-content: start;
  }

  .tdmu-article-related-card {
    flex-basis: 100%;
  }
}

@media (max-width: 575.98px) {
  .tdmu-article-detail-section {
    padding-top: 2.25rem;
  }

  .tdmu-article-feature-panel,
  .tdmu-article-related {
    padding: 0.88rem;
  }

  .tdmu-article-feature-title {
    font-size: clamp(28px, 7vw, 38px);
  }

  .tdmu-article-feature-meta {
    gap: 0.36rem;
  }

  .tdmu-article-feature-chip {
    font-size: 0.8rem;
  }

  .tdmu-article-feature-content {
    font-size: 0.99rem;
    line-height: 1.76;
  }
}

body.tdmu-contact-open {
  overflow: hidden;
}