*,*::before,*::after{box-sizing:border-box;}.nu-ccna-single{--cas-blue:#2563eb;--cas-blue-lt:#dbeafe;--cas-dark:#0a0f1e;--cas-ink:#0f172a;--cas-muted:#64748b;--cas-border:#e2e8f0;--cas-bg:#f8fafc;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;color:var(--cas-ink);}.nu-cas-header{background:var(--cas-dark);padding:36px 0 40px;position:relative;overflow:hidden;}.nu-cas-header::before{content:'';position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.03) 1px,transparent 1px);background-size:48px 48px;pointer-events:none;}.nu-cas-header-inner{max-width:1440px;margin:0 auto;padding:0 32px;position:relative;z-index:1;}.nu-cas-breadcrumb{display:flex;align-items:center;gap:6px;font-size:12px;color:#64748b;margin-bottom:20px;flex-wrap:wrap;}.nu-cas-breadcrumb a{color:#7ab8ff;text-decoration:none;}.nu-cas-breadcrumb a:hover{text-decoration:underline;}.nu-cas-breadcrumb span{color:#475569;}.nu-cas-bc-current{color:#94a3b8;}.nu-cas-domain-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:16px;}.nu-cas-domain-pill{display:inline-flex;align-items:center;gap:5px;background:rgba(37,99,235,.18);color:#93c5fd;border:1px solid rgba(37,99,235,.35);font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;padding:4px 12px;border-radius:999px;}.nu-cas-weight-pill{display:inline-block;background:rgba(0,212,100,.12);color:#34d399;border:1px solid rgba(0,212,100,.3);font-size:11px;font-weight:700;padding:4px 12px;border-radius:999px;}.nu-cas-pos-pill{display:inline-block;background:rgba(255,255,255,.07);color:#94a3b8;border:1px solid rgba(255,255,255,.12);font-size:11px;font-weight:600;padding:4px 12px;border-radius:999px;}.nu-cas-title{font-size:clamp(24px,3.5vw,40px);font-weight:900;color:#ffffff !important;line-height:1.2;letter-spacing:-.5px;margin:0 0 20px;}.nu-cas-meta{display:flex;align-items:center;gap:10px;font-size:13px;color:#94a3b8;flex-wrap:wrap;margin-bottom:20px;}.nu-cas-meta-author{display:flex;align-items:center;gap:7px;}.nu-cas-avatar{width:28px !important;height:28px !important;border-radius:50%;border:1.5px solid rgba(255,255,255,.2);}.nu-cas-meta svg{vertical-align:middle;}.nu-cas-meta-sep{color:#334155;}.nu-cas-progress{display:flex;align-items:center;gap:12px;}.nu-cas-progress-track{flex:1;max-width:280px;background:rgba(255,255,255,.1);border-radius:999px;height:4px;overflow:hidden;}.nu-cas-progress-fill{background:linear-gradient(90deg,#2563eb,#00d4ff);height:100%;border-radius:999px;transition:width .5s ease;}.nu-cas-progress-label{font-size:11px;color:#64748b;font-weight:600;white-space:nowrap;}.nu-cas-body{display:grid;grid-template-columns:200px 1fr 180px;grid-template-areas:"sidebar-left main sidebar-right";max-width:1440px;margin:0 auto;padding:0 32px;gap:0 28px;align-items:start;}.nu-cas-sidebar-left{grid-area:sidebar-left;position:sticky;top:24px;padding:28px 0;display:flex;flex-direction:column;gap:24px;}.nu-cas-module-nav{background:#fff;border:1.5px solid var(--cas-border);border-radius:12px;overflow:hidden;}.nu-cas-module-nav-header{background:var(--cas-dark);padding:14px 16px;}.nu-cas-module-label{display:block;font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.6px;color:#7ab8ff;margin-bottom:3px;}.nu-cas-module-name{display:block;font-size:13px;font-weight:700;color:#fff;line-height:1.35;}.nu-cas-module-list{list-style:none;margin:0;padding:8px 0;}.nu-cas-module-item{margin:0;}.nu-cas-module-link{display:flex;align-items:flex-start;gap:8px;padding:8px 16px;text-decoration:none;font-size:12px;color:#475569;line-height:1.4;transition:background .15s;cursor:pointer;}.nu-cas-module-link:hover:not(.disabled){background:#f0f6ff;color:var(--cas-blue);}.nu-cas-module-item.current .nu-cas-module-link{background:#eff6ff;color:var(--cas-blue);font-weight:700;}.nu-cas-module-link.disabled{color:#cbd5e1;cursor:default;}.nu-cas-art-num{display:inline-flex;align-items:center;justify-content:center;width:18px;height:18px;border-radius:4px;background:#e2e8f0;font-size:10px;font-weight:800;color:#475569;flex-shrink:0;margin-top:1px;}.nu-cas-module-item.current .nu-cas-art-num{background:var(--cas-blue);color:#fff;}.nu-cas-art-title{flex:1;}.nu-cas-art-reading{font-size:9px;background:#dbeafe;color:var(--cas-blue);padding:1px 6px;border-radius:999px;font-weight:700;text-transform:uppercase;letter-spacing:.4px;flex-shrink:0;}.nu-cas-art-soon{font-size:9px;background:#f1f5f9;color:#94a3b8;padding:1px 6px;border-radius:999px;font-weight:600;flex-shrink:0;}.nu-cas-all-modules{display:block;padding:10px 16px;font-size:12px;font-weight:600;color:var(--cas-blue);text-decoration:none;border-top:1px solid var(--cas-border);margin-top:4px;}.nu-cas-all-modules:hover{text-decoration:underline;}.nu-cas-share{display:flex;flex-direction:column;gap:8px;}.nu-cas-share-label{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;color:#94a3b8;}.nu-cas-share-btns{display:flex;flex-direction:column;gap:6px;}.nu-cas-share-btn{display:inline-flex;align-items:center;gap:6px;padding:7px 14px;background:#fff;border:1.5px solid var(--cas-border);border-radius:8px;font-size:12px;font-weight:600;color:#475569;text-decoration:none;cursor:pointer;transition:border-color .15s,background .15s;font-family:inherit;}.nu-cas-share-btn:hover{border-color:var(--cas-blue);background:#eff6ff;color:var(--cas-blue);}.nu-cas-main{grid-area:main;min-width:0;padding:36px 0 48px;}.nu-cas-feat-img{border-radius:12px;overflow:hidden;margin-bottom:36px;max-height:440px;}.nu-cas-feat-img img{width:100%;height:100%;object-fit:cover;display:block;}.nu-cas-prose{font-size:16px;line-height:1.8;color:#1e293b;max-width:100%;}.nu-cas-prose h2{font-size:22px;font-weight:800;color:#0f172a !important;margin:40px 0 14px;letter-spacing:-.3px;padding-top:8px;border-top:2px solid #f1f5f9;}.nu-cas-prose h3{font-size:18px;font-weight:700;color:#0f172a !important;margin:28px 0 10px;}.nu-cas-prose p{margin:0 0 18px;}.nu-cas-prose ul,.nu-cas-prose ol{padding-left:24px;margin:0 0 18px;}.nu-cas-prose li{margin-bottom:6px;}.nu-cas-prose a{color:var(--cas-blue);text-decoration:underline;text-underline-offset:3px;}.nu-cas-prose strong{color:#0f172a;font-weight:700;}.nu-cas-prose code{background:#f1f5f9;color:#dc2626;padding:2px 6px;border-radius:4px;font-size:.875em;font-family:'JetBrains Mono','Fira Code',monospace;}.nu-cas-prose pre{background:#0f172a;color:#e2e8f0;padding:20px 24px;border-radius:10px;overflow-x:auto;font-size:14px;line-height:1.6;margin:0 0 24px;}.nu-cas-prose pre code{background:none;color:inherit;padding:0;}.nu-cas-prose blockquote{border-left:4px solid var(--cas-blue);margin:0 0 24px;padding:14px 20px;background:#eff6ff;border-radius:0 8px 8px 0;font-style:italic;color:#374151;}.nu-cas-prose table{width:100%;border-collapse:collapse;margin:0 0 24px;font-size:14px;}.nu-cas-prose th{background:#0f172a;color:#fff;padding:10px 14px;text-align:left;font-weight:700;}.nu-cas-prose td{padding:9px 14px;border-bottom:1px solid #e2e8f0;color:#374151;}.nu-cas-prose tr:nth-child(even) td{background:#f8fafc;}.nu-cas-prose img{max-width:100%;border-radius:8px;margin:8px 0 20px;}.nu-cas-tags{display:flex;flex-wrap:wrap;gap:8px;padding:24px 0;border-top:1px solid var(--cas-border);border-bottom:1px solid var(--cas-border);margin-bottom:32px;}.nu-cas-tag{display:inline-block;padding:4px 12px;background:#f1f5f9;color:#475569;border-radius:999px;font-size:12px;font-weight:600;text-decoration:none;transition:background .15s,color .15s;}.nu-cas-tag:hover{background:#dbeafe;color:var(--cas-blue);}.nu-cas-art-nav{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:40px;}.nu-cas-art-nav-btn{display:flex;flex-direction:column;gap:4px;padding:16px 20px;background:#fff;border:1.5px solid var(--cas-border);border-radius:12px;text-decoration:none;transition:border-color .2s,box-shadow .2s;}.nu-cas-art-nav-btn:hover{border-color:var(--cas-blue);box-shadow:0 4px 16px rgba(37,99,235,.1);}.nu-cas-art-nav-btn.next{text-align:right;}.nu-cas-nav-dir{display:flex;align-items:center;gap:4px;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;color:var(--cas-blue);}.nu-cas-art-nav-btn.next .nu-cas-nav-dir{justify-content:flex-end;}.nu-cas-nav-title{font-size:14px;font-weight:600;color:#0f172a;line-height:1.4;}.nu-cas-author{display:flex;gap:16px;background:#fff;border:1.5px solid var(--cas-border);border-radius:12px;padding:24px;margin-bottom:40px;}.nu-cas-author-img{width:64px !important;height:64px !important;border-radius:50%;flex-shrink:0;}.nu-cas-author-body{flex:1;}.nu-cas-author-top{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:10px;}.nu-cas-author-name{display:block;font-size:16px;font-weight:800;color:#0f172a !important;text-decoration:none;margin-bottom:2px;}.nu-cas-author-role{display:block;font-size:12px;color:#94a3b8;font-weight:600;text-transform:uppercase;letter-spacing:.4px;}.nu-cas-author-links{display:flex;gap:10px;}.nu-cas-author-links a{font-size:12px;font-weight:600;color:var(--cas-blue);text-decoration:none;padding:4px 10px;border:1px solid #dbeafe;border-radius:6px;background:#eff6ff;}.nu-cas-author-links a:hover{background:#dbeafe;}.nu-cas-author-bio{font-size:14px;color:#64748b;line-height:1.65;margin:0;}.nu-cas-related-heading{font-size:20px;font-weight:800;color:#0f172a !important;margin:0 0 20px;}.nu-cas-related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;}.nu-cas-related-card{background:#fff;border:1.5px solid var(--cas-border);border-radius:12px;overflow:hidden;text-decoration:none;display:flex;flex-direction:column;transition:border-color .2s,transform .2s;}.nu-cas-related-card:hover{border-color:var(--cas-blue);transform:translateY(-2px);}.nu-cas-related-img{height:120px;overflow:hidden;}.nu-cas-related-img img{width:100%;height:100%;object-fit:cover;}.nu-cas-related-body{padding:14px;display:flex;flex-direction:column;gap:6px;}.nu-cas-related-cat{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;color:var(--cas-blue);}.nu-cas-related-body h3{font-size:13px;font-weight:700;color:#0f172a !important;margin:0;line-height:1.4;}.nu-cas-related-date{font-size:11px;color:#94a3b8;}.nu-cas-sidebar-right{grid-area:sidebar-right;position:sticky;top:24px;padding:28px 0;}.nu-cas-toc-wrap{background:#fff;border:1.5px solid var(--cas-border);border-radius:12px;overflow:hidden;}.nu-cas-toc-header{display:flex;align-items:center;gap:7px;padding:12px 16px;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;color:#94a3b8;border-bottom:1px solid var(--cas-border);background:#f8fafc;}.nu-cas-toc-nav{display:flex;flex-direction:column;padding:8px 0;max-height:60vh;overflow-y:auto;}.nu-cas-toc-link{display:block;padding:6px 16px;font-size:12px;color:#64748b;text-decoration:none;line-height:1.45;border-left:2px solid transparent;transition:color .15s,border-color .15s,background .15s;}.nu-cas-toc-link:hover{color:var(--cas-blue);background:#f0f6ff;}.nu-cas-toc-link.active{color:var(--cas-blue);border-left-color:var(--cas-blue);background:#eff6ff;font-weight:600;}.nu-cas-toc-h3{padding-left:28px;font-size:11px;}@media (max-width:1200px){.nu-cas-body{grid-template-columns:190px 1fr;grid-template-areas:"sidebar-left main";gap:0 24px;}.nu-cas-sidebar-right{display:none;}}@media (max-width:900px){.nu-cas-body{grid-template-columns:170px 1fr;gap:0 20px;}}@media (max-width:768px){.nu-cas-body{grid-template-columns:1fr;grid-template-areas:"main";padding:0 20px;}.nu-cas-sidebar-left{display:none;}.nu-cas-related-grid{grid-template-columns:1fr 1fr;}.nu-cas-art-nav{grid-template-columns:1fr;}.nu-cas-author{flex-direction:column;}.nu-cas-author-top{flex-direction:column;gap:10px;}.nu-cas-title{font-size:26px;}}@media (max-width:560px){.nu-cas-body{padding:0 16px;}.nu-cas-related-grid{grid-template-columns:1fr;}.nu-cas-header{padding:24px 0 28px;}.nu-cas-header-inner{padding:0 16px;}.nu-cas-title{font-size:22px;}.nu-cas-prose{font-size:15px;}}