.detail-section.caution {
  background: #fff6df;
  border-left: 3px solid var(--gold);
  padding: 11px 14px;
  border-radius: 0 10px 10px 0;
}
.source-link {
  color: var(--blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}
body.dark .detail-section.caution { background: #2b2a24; }

.research-brief { margin: 24px 0; }
.research-brief .detail-section { border-top: 1px solid var(--line); margin: 0; padding: 20px 0; }
.research-brief .detail-section:first-child { border-top: 0; }
.research-brief .detail-section p { font-size: 16px; line-height: 1.65; margin: 8px 0 0; }
.research-brief .overview { background: var(--bluep); border-radius: 12px; padding: 18px; }
.research-brief .takeaway { background: #fff5ef; border-left: 4px solid var(--gold); padding: 18px; }
.research-brief .takeaway p { color: var(--ink); font: 700 19px/1.45 Georgia, serif; }
.type-badge.video { background: #7b1fa2; color: #fff; }
.video-card { overflow: hidden; }
.video-thumb { position: relative; display: block; width: calc(100% + 40px); height: 170px; margin: -20px -20px 18px; border: 0; padding: 0; overflow: hidden; background: #07162f; cursor: pointer; }
.video-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; opacity: .9; transition: transform .25s ease, opacity .25s ease; }
.video-thumb span { position: absolute; left: 50%; top: 50%; transform: translate(-50%,-50%); display: grid; place-items: center; width: 54px; height: 54px; border-radius: 50%; background: rgba(7,22,47,.9); color: #fff; font-size: 20px; padding-left: 3px; box-shadow: 0 8px 24px rgba(0,0,0,.25); }
.video-thumb:hover img { transform: scale(1.025); opacity: 1; }
.creator { font-size: .82rem !important; color: var(--muted) !important; margin-top: -4px !important; }
.popularity { display: inline-block; margin: 7px 0 0; padding: 4px 8px; border-radius: 999px; background: #f2e8f7; color: #6b177f; font-size: .78rem; font-weight: 700; }
body.dark .popularity { background: #34213a; color: #e8b8f3; }
.video-frame { position: relative; width: 100%; aspect-ratio: 16/9; margin: 18px 0 24px; border-radius: 14px; overflow: hidden; background: #07162f; }
.video-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }