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var(--gray-100);border-radius:var(--radius-lg);padding:32px;box-shadow:var(--shadow-sm)}.rd-related-tabs{display:flex;gap:16px;overflow-x:auto;border-bottom:1px solid var(--gray-50);margin-bottom:24px}.rd-rel-tab{background:none;border:none;padding:10px 4px;font-size:.85rem;font-weight:700;color:var(--gray-400);cursor:pointer;border-bottom:2px solid transparent;transition:var(--transition);white-space:nowrap}.rd-rel-tab:hover{color:var(--navy)}.rd-rel-tab.active{color:var(--navy);border-bottom-color:var(--gold)}.rd-rel-panel{display:none;animation:rd-fade-in .4s ease}.rd-rel-panel.active{display:block}.rd-related-grid{display:grid;grid-template-columns:1fr;gap:16px}.rd-related-item{display:flex;gap:16px;padding:16px;border:1px solid var(--gray-50);border-radius:var(--radius-md);transition:var(--transition)}.rd-related-item:hover{border-color:var(--navy-mid);transform:translate(4px);box-shadow:var(--shadow-sm)}.rd-rel-icon-tag{width:48px;height:48px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;color:var(--white);flex-shrink:0}.rd-rel-content{display:flex;flex-direction:column;gap:4px}.rd-rel-meta{font-size:.7rem;color:var(--gray-400);font-weight:700;text-transform:uppercase}.rd-rel-title-link{font-size:.95rem;font-weight:700;color:var(--navy);text-decoration:none;transition:var(--transition)}.rd-rel-title-link:hover{color:var(--gold)}.rd-rel-author{font-size:.8rem;color:var(--text-light)}.rd-rel-stats{font-size:.75rem;color:var(--gray-300);display:flex;gap:8px}.rd-skeleton-header{height:240px;background:var(--gray-100);border-radius:var(--radius-lg);margin-bottom:24px}.rd-skeleton-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:24px}.rd-skeleton-stat{height:80px;background:var(--gray-100);border-radius:var(--radius-md)}.rd-skeleton-content{height:400px;background:var(--gray-100);border-radius:var(--radius-lg)}.rd-skeleton-sidebar{height:300px;background:var(--gray-100);border-radius:var(--radius-lg)}.rd-shimmer{background:linear-gradient(90deg,var(--gray-50) 25%,var(--gray-100) 50%,var(--gray-50) 75%);background-size:200% 100%;animation:rd-shimmer 1.5s infinite}@keyframes rd-shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}.rd-state-card{background:var(--white);border:1px solid var(--gray-100);border-radius:var(--radius-lg);padding:60px 40px;text-align:center;box-shadow:var(--shadow-md);max-width:500px;margin:60px auto;animation:rd-fade-in .5s ease}@keyframes rd-fade-in{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.rd-state-icon{font-size:3.5rem;color:var(--gray-200);margin-bottom:20px}.rd-state-title{font-family:var(--font-display);font-size:1.6rem;font-weight:800;color:var(--navy);margin-bottom:12px}.rd-state-desc{font-size:.95rem;color:var(--gray-400);line-height:1.6;margin-bottom:24px}.rd-state-btn{display:inline-flex;align-items:center;gap:8px;background:var(--navy-mid);color:var(--white);padding:10px 24px;border-radius:var(--radius-sm);font-weight:700;text-decoration:none;transition:var(--transition);border:none;cursor:pointer}.rd-state-btn:hover{background:var(--navy)}@media (max-width: 992px){.rd-grid{grid-template-columns:1fr;gap:28px}.rd-sidebar{display:grid;grid-template-columns:1fr 1fr;gap:24px}}@media (max-width: 768px){.rd-main{padding:24px 16px 60px}.rd-header-card{grid-template-columns:1fr;gap:20px;padding:24px}.rd-cover-wrap{height:180px}.rd-title{font-size:1.5rem}.rd-sidebar{grid-template-columns:1fr}.rd-body-card{padding:24px}.rd-stats-grid{grid-template-columns:repeat(2,1fr)}.rd-video-layout{grid-template-columns:1fr}.rd-video-sidebar{border-left:none;border-top:1px solid #1f2937}.rd-ppt-title{font-size:1.4rem}.rd-ppt-bullets{font-size:.9rem}}