.home-preview {
  --preview-border: #e4e8ec;
  --preview-muted: #65717d;
  --preview-surface: #f7f9fa;
  --preview-accent: #087df1;
}

.preview-section {
  padding: clamp(3rem, 6vw, 5rem) 0;
}

.preview-section + .preview-section {
  border-top: 1px solid #edf0f2;
}

.preview-section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: clamp(1.5rem, 4vw, 4rem);
  margin-bottom: 2rem;
}

.preview-section-heading h1,
.preview-section-heading h2 {
  margin: 0 0 0.55rem;
  font-size: clamp(1.9rem, 3vw, 2.55rem);
  line-height: 1.15;
}

.preview-section-heading p {
  max-width: 960px;
  margin: 0;
  color: var(--preview-muted);
  font-size: 1.05rem;
  line-height: 1.65;
}

.preview-section-link {
  padding-bottom: 0.15rem;
  color: var(--preview-accent);
  font-weight: 600;
  white-space: nowrap;
}

.preview-section-link:hover,
.preview-section-link:focus {
  color: #005fc2;
  text-decoration: none;
}

.preview-research-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: start;
  gap: 1.5rem;
}

.preview-research-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  height: auto;
  overflow: hidden;
  border: 1px solid var(--preview-border);
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 4px 16px rgba(31, 42, 55, 0.05);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.preview-research-card:hover {
  border-color: #c8d0d8;
  box-shadow: 0 10px 26px rgba(31, 42, 55, 0.1);
  transform: translateY(-2px);
}

.preview-research-media {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 16 / 10;
  margin: 0;
  padding: clamp(0.35rem, 0.8vw, 0.65rem);
  background: var(--preview-surface);
  border-bottom: 1px solid var(--preview-border);
}

.preview-research-media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.preview-research-body {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  padding: 1.4rem 1.45rem 1.5rem;
}

.preview-research-body h3 {
  margin: 0 0 0.8rem;
  font-size: 1.3rem;
  line-height: 1.35;
}

.preview-research-body p {
  margin-bottom: 1rem;
  color: #3f4851;
  line-height: 1.65;
}

.preview-methods {
  margin: auto 0 1rem;
  color: var(--preview-muted);
  font-size: 0.93rem;
  line-height: 1.65;
}

.preview-card-link {
  font-weight: 600;
}

.preview-card-details {
  margin-top: auto;
  border-top: 1px solid var(--preview-border);
}

.preview-card-details > summary {
  padding: 0.9rem 0;
  color: var(--preview-accent);
  font-weight: 600;
  cursor: pointer;
}

.preview-card-details-body {
  padding-top: 0.2rem;
}

.preview-card-details-body h4 {
  margin: 1.15rem 0 0.65rem;
  font-size: 1rem;
}

.preview-technique {
  border-top: 1px solid var(--preview-border);
}

.preview-technique > summary {
  padding: 0.75rem 0.15rem;
  font-weight: 600;
  cursor: pointer;
}

.preview-technique > div {
  padding: 0 0.6rem 0.9rem 1rem;
  border-left: 2px solid #e9ecef;
}

.preview-technique p {
  margin-bottom: 0.45rem;
}

.preview-featured-title {
  margin: 0 0 1.25rem;
  font-size: 1.2rem;
}

.preview-featured-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
  margin-bottom: clamp(3rem, 5vw, 4.5rem);
}

.preview-all-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-bottom: clamp(3rem, 5vw, 4.5rem);
}

.preview-all-cards-grid .news-social-card {
  display: flex;
  width: auto;
  max-width: none;
  height: 100%;
  min-width: 0;
  flex-direction: column;
  margin: 0;
  border-radius: 10px;
  box-shadow: 0 3px 12px rgba(31, 42, 55, 0.05);
}

.preview-all-cards-grid .news-social-card-media {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
  max-height: none;
  aspect-ratio: 16 / 9;
  padding: 0.5rem;
  background: var(--preview-surface);
}

.preview-all-cards-grid .news-social-card-media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  box-shadow: none;
}

.preview-all-cards-grid .news-social-card-media--cover img {
  width: auto;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.preview-all-cards-grid .news-social-card-body {
  flex: 1 1 auto;
  justify-content: flex-start;
  gap: 0.45rem;
  padding: 0.95rem 1rem 1.05rem;
}

.preview-all-cards-grid .news-social-card-body strong {
  font-size: 1.05rem;
}

.preview-all-cards-grid .news-social-card-body > span:not(.news-social-card-meta):not(.news-social-card-link) {
  display: -webkit-box;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  font-size: 0.92rem;
  line-height: 1.5;
}

.preview-feature-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--preview-border);
  border-radius: 12px;
  background: #fff;
  color: #212529;
  box-shadow: 0 4px 16px rgba(31, 42, 55, 0.05);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.preview-feature-card:hover,
.preview-feature-card:focus {
  border-color: #c8d0d8;
  color: #212529;
  text-decoration: none;
  box-shadow: 0 10px 26px rgba(31, 42, 55, 0.1);
  transform: translateY(-2px);
}

.preview-feature-media {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  padding: 0.65rem;
  background: var(--preview-surface);
  border-bottom: 1px solid var(--preview-border);
}

.preview-feature-media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.preview-feature-media--cover img {
  width: auto;
  max-width: 100%;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.16);
}

.preview-feature-body {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  gap: 0.65rem;
  padding: 1.25rem 1.35rem 1.4rem;
}

.preview-feature-meta {
  color: var(--preview-muted);
  font-size: 0.82rem;
  letter-spacing: 0.01em;
}

.preview-feature-body strong {
  font-size: 1.2rem;
  line-height: 1.35;
}

.preview-feature-body p {
  margin: 0;
  color: #3f4851;
  line-height: 1.55;
}

.preview-feature-link {
  margin-top: auto;
  padding-top: 0.25rem;
  color: var(--preview-accent);
  font-weight: 600;
}

.preview-latest-title {
  margin: 0 0 1rem;
  font-size: 1.45rem;
}

.preview-news-timeline {
  margin: 0;
  padding: 0;
  border-bottom: 1px solid var(--preview-border);
  list-style: none;
}

.preview-news-timeline li {
  display: grid;
  grid-template-columns: 6rem minmax(0, 1fr);
  gap: 1.25rem;
  padding: 1rem 0;
  border-top: 1px solid var(--preview-border);
  line-height: 1.6;
}

.preview-news-timeline time {
  color: var(--preview-muted);
  font-size: 0.92rem;
  font-weight: 600;
  white-space: nowrap;
}

.preview-news-timeline li:first-child time {
  color: #dc3545;
}

.preview-full-archive {
  margin-top: 1.4rem;
  border-bottom: 1px solid var(--preview-border);
}

.preview-full-archive > summary {
  padding: 1rem 0.25rem;
  color: #343a40;
  font-weight: 600;
  cursor: pointer;
}

.preview-full-archive > summary::marker {
  color: var(--preview-muted);
}

.preview-full-archive > .container {
  max-width: none;
  padding: 0.75rem 0 0;
}

.preview-full-archive .card-header {
  background: var(--preview-surface);
}

@media (max-width: 991.98px) {
  .preview-research-grid,
  .preview-featured-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 767.98px) {
  .preview-section {
    padding: 2.75rem 0;
  }

  .preview-section-heading {
    grid-template-columns: 1fr;
    align-items: start;
    gap: 0.85rem;
    margin-bottom: 1.5rem;
  }

  .preview-research-grid,
  .preview-featured-grid {
    grid-template-columns: 1fr;
  }

  .preview-news-timeline li {
    grid-template-columns: 1fr;
    gap: 0.2rem;
    padding: 0.9rem 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .preview-research-card,
  .preview-feature-card {
    transition: none;
  }
}