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var(--header-compact-height) - 48px);position:sticky}.article-rail .article-toc,.article-rail .article-toc-frame{flex-direction:column;min-height:0;display:flex}.article-rail .article-toc-title{margin-bottom:4px}.article-rail .article-toc-list{overscroll-behavior:contain;min-height:0;padding-block:8px 16px;overflow-y:auto;-webkit-mask-image:linear-gradient(#0000,#000 8px calc(100% - 16px),#0000);mask-image:linear-gradient(#0000,#000 8px calc(100% - 16px),#0000)}.article-rail .article-toc-frame{padding-bottom:4px}.article-rail>.sidebar-card{flex-shrink:0}}@media (width>=1024px) and (height<=720px){.article-rail-secondary{display:none}}@media (prefers-reduced-motion:reduce){.sidebar-section-link,.recent-post-title,.article-toc-link,.article-toc-chevron{transition:none}}