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0;overflow:hidden;border-radius:var(--radius);background:#dde4ec}.article-topic-banner img{width:100%;height:100%;object-fit:cover}.article-grid{display:grid;gap:22px;align-items:start}.article-main{min-width:0}.prose{color:#222936;font-size:1rem}.prose h2,.prose h3{scroll-margin-top:90px;margin:28px 0 10px;line-height:1.18;letter-spacing:0}.prose h2{font-size:1.42rem}.prose h3{font-size:1.16rem}.prose ol,.prose p,.prose ul{margin:0 0 16px}.prose ol,.prose ul{padding-left:1.25rem}.prose li+li{margin-top:8px}.prose strong{color:#111827}.author-box,.course-overview-card,.toc{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-sm)}.toc{padding:14px}.toc h2{margin:0 0 10px;font-size:1rem;letter-spacing:0}.toc a{display:flex;min-height:38px;align-items:center;padding:5px 0;color:#384252;font-size:.92rem}.toc summary{min-height:44px;font-weight:850}.toc-mobile{margin:4px 0}.course-snapshot-toc{padding:0;overflow:hidden;border:1px solid rgba(196,206,217,.88);border-radius:8px;background:#fff;box-shadow:none}.course-snapshot-toc summary{display:flex;align-items:center;gap:10px;min-height:54px;padding:12px 14px;color:#111827;cursor:pointer;list-style:none;background:linear-gradient(90deg,rgba(15,118,110,.08),rgba(255,247,237,.72)),#fff}.course-snapshot-toc summary::-webkit-details-marker{display:none}.course-snapshot-toc summary::marker{content:""}.course-snapshot-toc summary::before{content:"";display:grid;place-items:center;flex:0 0 auto;width:32px;height:32px;border-radius:8px;background:linear-gradient(#fff,#fff) center 9px/14px 2px no-repeat,linear-gradient(#fff,#fff) center/14px 2px no-repeat,linear-gradient(#fff,#fff) center 21px/14px 2px no-repeat,linear-gradient(135deg,var(--brand),#16a39a);box-shadow:inset 0 0 0 1px rgba(255,255,255,.22)}.course-snapshot-toc summary::after{content:"";flex:0 0 auto;width:10px;height:10px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg);transition:transform 160ms}.course-snapshot-toc[open] summary::after{transform:translateY(3px) rotate(225deg)}.course-toc-title{color:#111827;font-size:1.02rem;font-weight:950;line-height:1.1}.course-toc-count{margin-left:auto;padding:5px 9px;border-radius:999px;background:rgba(255,255,255,.76);color:var(--brand-dark);font-size:.76rem;font-weight:850;line-height:1;white-space:nowrap}.course-snapshot-toc ol{display:grid;gap:7px;padding:10px;border-top:1px solid rgba(221,228,236,.9);background:#fbfdfc}.course-snapshot-toc a{min-height:40px;padding:8px 10px;border:1px solid rgba(221,228,236,.9);border-radius:8px;background:#fff;color:#2f3b4c;font-size:.9rem;font-weight:800}.course-snapshot-toc a:hover{border-color:rgba(15,118,110,.32);background:#eef7f5;color:var(--brand-dark)}.article-sidebar{display:grid;gap:16px}.author-box{display:grid;gap:14px;align-items:center;grid-template-columns:84px 1fr;margin:28px 0 0;padding:14px}.author-box img{border-radius:var(--radius);object-fit:cover;width:84px;height:84px}.author-box h2{margin:0 0 5px;letter-spacing:0}.author-box p{margin:0;color:var(--muted)}.article-directory-grid{display:grid;gap:14px}.article-card{display:flex;min-width:0;min-height:100%;overflow:hidden;flex-direction:column;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-sm);transition:transform 160ms,border-color 160ms,box-shadow 160ms}.article-card:hover{transform:translateY(-2px);border-color:rgba(15,118,110,.34);box-shadow:var(--shadow)}.article-card-media{aspect-ratio:16/9;margin:0;overflow:hidden;background:#dde4ec}.article-card-media img{width:100%;height:100%;object-fit:cover}.article-card-body{display:flex;flex:1;flex-direction:column;gap:7px;padding:13px}.article-card 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