:root{--primary-color:#0d6efd;--primary-hover:#0b5ed7;--primary-subtle:rgba(13,110,253,0.08);--text-color:#212529;--text-muted:#6c757d;--heading-color:#0f172a;--bg-color:#ffffff;--bg-secondary:#f8f9fa;--border-color:#dee2e6;--sidebar-width:300px;--sidebar-bg:#1e293b;--sidebar-text:#cbd5e1;--sidebar-hover:#334155;--sidebar-border:#334155;--code-bg:#1e1e1e;--code-text:#d4d4d4;--inline-code-bg:#f1f5f9;--inline-code-text:#d63384;--table-stripe:#f8fafc;--table-border:#dee2e6;--callout-info-bg:rgba(13,202,240,0.1);--callout-info-border:#0dcaf0;--callout-tip-bg:rgba(25,135,84,0.1);--callout-tip-border:#198754;--callout-warning-bg:rgba(255,193,7,0.1);--callout-warning-border:#ffc107;--callout-danger-bg:rgba(220,53,69,0.1);--callout-danger-border:#dc3545;--callout-concept-bg:rgba(13,110,253,0.06);--callout-concept-border:var(--primary-color);--font-sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;--font-mono:"Fira Code","JetBrains Mono","Source Code 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var(--sidebar-border)}.navbar-brand{color:#f1f5f9;text-decoration:none;font-weight:700;font-size:1.05rem;margin-left:0.5rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.navbar-brand:hover{color:var(--primary-color)}.navbar-right{margin-left:auto;display:flex;align-items:center;gap:0.5rem}.theme-toggle{background:none;border:none;color:#cbd5e1;font-size:1.25rem;cursor:pointer;padding:0.25rem 0.5rem;border-radius:0.375rem}.theme-toggle:hover{color:#f1f5f9;background:rgba(255,255,255,0.1)}.hamburger{background:none;border:none;color:#f1f5f9;font-size:1.5rem;cursor:pointer;padding:0.25rem 0.5rem;display:none}.reading-progress{position:fixed;top:var(--navbar-height);left:0;width:0%;height:3px;background:var(--primary-color);z-index:1041;transition:width 0.1s linear}.main-layout{display:flex;min-height:100vh;padding-top:var(--navbar-height)}.main-content{flex:1;min-width:0;margin-left:var(--sidebar-width)}.content-wrapper{max-width:var(--content-max-width);margin:0 auto;padding:var(--content-padding)}.site-footer{margin-top:3rem;padding:1.5rem 0;border-top:1px solid var(--border-color);text-align:center;font-size:0.8rem;color:var(--text-muted)}.footer-links{margin-top:0.25rem}.footer-links a{color:var(--text-muted);text-decoration:none}.footer-links a:hover{color:var(--primary-color);text-decoration:underline}.sidebar{position:fixed;top:var(--navbar-height);left:0;width:var(--sidebar-width);height:calc(100vh - var(--navbar-height));background:var(--sidebar-bg);color:var(--sidebar-text);overflow-y:auto;z-index:1030;border-right:1px solid var(--sidebar-border);font-size:0.85rem;transition:transform 0.3s ease}.sidebar-nav{padding:0.5rem 0}.sidebar-ad{padding:0.75rem;border-top:1px solid var(--sidebar-border)}.nav-part{border-bottom:1px solid var(--sidebar-border)}.nav-part-toggle{display:block;width:100%;text-align:left;background:none;border:none;color:#94a3b8;font-size:0.7rem;font-weight:700;letter-spacing:0.05em;text-transform:uppercase;padding:0.75rem 1rem 0.4rem;cursor:pointer}.nav-part-toggle:hover{color:#e2e8f0}.nav-part-toggle[aria-expanded="false"]+.nav-part-chapters{display:none}.nav-part-toggle[aria-expanded="true"]+.nav-part-chapters{display:block}.nav-chapter{position:relative}.nav-chapter-toggle{display:flex;align-items:center;width:100%;background:none;border:none;padding:0;cursor:pointer;color:inherit}.nav-chapter-link,.nav-chapter-link.standalone{display:block;padding:0.4rem 1rem 0.4rem 1.25rem;color:var(--sidebar-text);text-decoration:none;transition:background 0.15s,color 0.15s;flex:1;text-align:left}.nav-chapter-link:hover{background:var(--sidebar-hover);color:#f1f5f9}.nav-chapter-link.active{color:var(--primary-color);background:var(--primary-subtle);font-weight:600}.nav-sections{padding-left:0.5rem}.nav-section{display:block;padding:0.25rem 1rem 0.25rem 2rem;color:#94a3b8;text-decoration:none;font-size:0.8rem;transition:background 0.15s,color 0.15s}.nav-section:hover{background:var(--sidebar-hover);color:#e2e8f0}.nav-section.active{color:var(--primary-color);background:var(--primary-subtle);font-weight:600}.nav-chapter.open>.nav-chapter-toggle{color:#f1f5f9}.sidebar-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,0.5);z-index:1020}.sidebar-overlay.show{display:block}.content-wrapper h1,.content-wrapper h2,.content-wrapper h3,.content-wrapper h4,.content-wrapper h5,.content-wrapper h6{color:var(--heading-color);line-height:1.3}.content-wrapper 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var(--border-color);margin:2rem 0}.content-wrapper blockquote{margin:1.25rem 0;padding:1rem 1.25rem;background:var(--bg-secondary);border-left:4px solid var(--primary-color);border-radius:0 0.5rem 0.5rem 0;color:var(--text-muted)}.content-wrapper blockquote p{margin:0}.content-wrapper code:not(pre code){font-family:var(--font-mono);font-size:0.875em;background:var(--inline-code-bg);color:var(--inline-code-text);padding:0.15em 0.4em;border-radius:0.25rem}.content-wrapper pre{background:var(--code-bg);border-radius:0.5rem;margin:1.5rem 0;overflow:hidden;position:relative}.content-wrapper pre code{display:block;background:var(--code-bg);color:var(--code-text);padding:1.25rem 1.5rem;overflow-x:auto;font-family:var(--font-mono);font-size:0.85rem;line-height:1.55;border-radius:0.5rem}.copy-btn{position:absolute;top:0.5rem;right:0.5rem;background:rgba(255,255,255,0.1);border:1px solid rgba(255,255,255,0.2);color:#adb5bd;border-radius:0.25rem;padding:0.25rem 0.6rem;font-size:0.72rem;cursor:pointer;opacity:0;transition:opacity 0.2s,background 0.15s}.content-wrapper pre:hover .copy-btn{opacity:1}.copy-btn:hover{background:rgba(255,255,255,0.2);color:#fff}.copy-btn.copied{background:#198754;border-color:#198754;color:#fff;opacity:1}.katex-display{overflow-x:auto;overflow-y:hidden;padding:0.5rem 0}.katex{font-size:1.1em}.table-responsive{overflow-x:auto;margin:1.5rem 0;border-radius:0.5rem;border:1px solid var(--table-border)}.content-wrapper table{width:100%;border-collapse:collapse;font-size:0.9rem}.content-wrapper thead{background:var(--bg-secondary)}.content-wrapper th{padding:0.65rem 0.9rem;font-weight:600;border-bottom:2px solid var(--table-border);text-align:left}.content-wrapper td{padding:0.55rem 0.9rem;border-bottom:1px solid var(--table-border)}.content-wrapper tbody tr:nth-child(even){background:var(--table-stripe)}.content-wrapper tbody tr:hover{background:var(--primary-subtle)}.callout{padding:1rem 1.25rem;margin:1.5rem 0;border-radius:0.5rem;border-left:4px solid}.callout-title{margin-top:0;margin-bottom:0.5rem;font-size:0.9rem;font-weight:600}.callout p:last-child{margin-bottom:0}.callout-info{background:var(--callout-info-bg);border-color:var(--callout-info-border)}.callout-tip{background:var(--callout-tip-bg);border-color:var(--callout-tip-border)}.callout-warning{background:var(--callout-warning-bg);border-color:var(--callout-warning-border)}.callout-danger{background:var(--callout-danger-bg);border-color:var(--callout-danger-border)}.callout-key-concept{background:var(--callout-concept-bg);border-color:var(--callout-concept-border)}details{margin:0.75rem 0;border:1px solid var(--border-color);border-radius:0.5rem;overflow:hidden}summary{padding:0.65rem 1rem;cursor:pointer;font-weight:600;user-select:none;background:var(--bg-secondary)}summary:hover{background:var(--primary-subtle)}details[open] summary{border-bottom:1px solid var(--border-color)}details>*:not(summary){padding:0 1rem}details>p:first-of-type{padding-top:0.75rem}details>p:last-of-type{padding-bottom:0.75rem}.breadcrumbs{font-size:0.8rem;color:var(--text-muted);margin-bottom:1.5rem;padding-bottom:0.75rem;border-bottom:1px solid var(--border-color)}.breadcrumbs a{color:var(--primary-color);text-decoration:none}.breadcrumbs a:hover{text-decoration:underline}.breadcrumbs .separator{margin:0 0.4rem}.page-nav{display:flex;justify-content:space-between;gap:1rem;margin-top:3rem;padding-top:1.5rem;border-top:1px solid var(--border-color)}.page-nav-btn{display:flex;flex-direction:column;padding:0.75rem 1rem;text-decoration:none;color:var(--text-color);border:1px solid var(--border-color);border-radius:0.5rem;max-width:45%;transition:all 0.15s}.page-nav-btn:hover{border-color:var(--primary-color);color:var(--primary-color);text-decoration:none}.page-nav-btn .label{font-size:0.72rem;text-transform:uppercase;color:var(--text-muted);margin-bottom:0.2rem;letter-spacing:0.03em}.page-nav-btn .title{font-weight:500;font-size:0.9rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.page-nav-btn.next{margin-left:auto;text-align:right}.ad-container{margin:1.5rem 0;text-align:center;min-height:50px}.ad-header{margin-top:0;margin-bottom:1.5rem}.ad-footer{margin-top:2rem;margin-bottom:1rem}.ad-sidebar{margin:1rem 0.75rem}.ad-in-content{margin:2rem 0}.hero-section{text-align:center;padding:3rem 1.5rem;background:linear-gradient(135deg,var(--bg-secondary) 0%,var(--bg-color) 100%);border-radius:1rem;margin-bottom:3rem;border:1px solid var(--border-color)}.hero-section h1{font-size:2.5rem;margin-bottom:1rem;border:none;padding-bottom:0}.hero-section .lead{font-size:1.2rem;color:var(--text-muted);max-width:600px;margin:0 auto 1.5rem}.hero-section .btn-primary{display:inline-block;padding:0.65rem 2rem;background:var(--primary-color);color:#fff;border-radius:0.5rem;text-decoration:none;font-weight:600;transition:background 0.15s}.hero-section .btn-primary:hover{background:var(--primary-hover)}.part-card{margin-bottom:2rem;background:var(--bg-color);border:1px solid var(--border-color);border-radius:0.5rem;padding:1.5rem}.part-card:hover{border-color:var(--primary-color);box-shadow:0 2px 8px rgba(0,0,0,0.06)}.part-header{display:flex;align-items:center;gap:1rem;margin-bottom:1rem}.part-number{background:var(--primary-color);color:#fff;width:44px;height:44px;border-radius:0.5rem;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.1rem;flex-shrink:0}.chapter-list{list-style:none;padding:0;margin:0}.chapter-list li{padding:0.5rem 0;border-bottom:1px solid var(--border-color)}.chapter-list li:last-child{border-bottom:none}.chapter-list a{color:var(--text-color);text-decoration:none}.chapter-list a:hover{color:var(--primary-color)}.learning-objectives{background:var(--primary-subtle);border:1px solid var(--primary-color);border-radius:0.5rem;padding:1.25rem;margin-bottom:2rem}.learning-objectives h3{margin-top:0;color:var(--primary-color);font-size:1rem}.learning-objectives ul{margin-bottom:0}.in-this-chapter{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:0.5rem;padding:1.25rem;margin-bottom:2rem}.in-this-chapter h3{margin-top:0;font-size:1rem}.in-this-chapter ul{margin-bottom:0;padding-left:1.25rem}.in-this-chapter a{color:var(--text-color);text-decoration:none}.in-this-chapter a:hover{color:var(--primary-color)}.chapter-sub-nav{display:flex;flex-wrap:wrap;gap:0.5rem;margin-bottom:2rem}.chapter-sub-nav a{display:inline-block;padding:0.35rem 0.85rem;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:2rem;font-size:0.82rem;color:var(--text-color);text-decoration:none;transition:all 0.15s}.chapter-sub-nav a:hover{background:var(--primary-subtle);border-color:var(--primary-color);color:var(--primary-color)}@media (max-width:991.98px){.sidebar{transform:translateX(-100%)}.sidebar.show{transform:translateX(0)}.hamburger{display:block}.main-content{margin-left:0}.content-wrapper{padding:1.25rem}}@media (max-width:767.98px){.content-wrapper h1{font-size:1.6rem}.content-wrapper h2{font-size:1.3rem}.hero-section h1{font-size:1.8rem}.hero-section{padding:2rem 1rem}.page-nav{flex-direction:column}.page-nav-btn{max-width:100%}.page-nav-btn.next{text-align:left;margin-left:0}}@media print{.sidebar,.top-navbar,.hamburger,.sidebar-overlay,.page-nav,.breadcrumbs,.copy-btn,.reading-progress,.ad-container,.site-footer,.cookie-consent-banner{display:none !important}.main-content{margin-left:0}.content-wrapper{max-width:100%;padding:0}.content-wrapper pre code{white-space:pre-wrap;word-break:break-all}}.cookie-consent-banner{position:fixed;bottom:0;left:0;right:0;background:var(--bg-color);border-top:1px solid var(--border-color);box-shadow:0 -2px 10px rgba(0,0,0,0.1);z-index:1100;padding:1rem 1.5rem;display:none}.cookie-consent-content{max-width:900px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:1rem}.cookie-consent-buttons{display:flex;gap:0.5rem;flex-shrink:0}.cookie-consent-buttons button{padding:0.4rem 1rem;border-radius:0.375rem;font-size:0.85rem;cursor:pointer;border:1px solid var(--border-color);background:var(--bg-secondary);color:var(--text-color)}.cookie-consent-buttons .btn-accept{background:var(--primary-color);border-color:var(--primary-color);color:#fff}@media (max-width:767.98px){.cookie-consent-content{flex-direction:column;text-align:center}}.reading-time{display:inline-flex;align-items:center;gap:0.35rem;font-size:0.8rem;color:var(--text-muted);background:var(--bg-secondary);padding:0.25rem 0.75rem;border-radius:2rem;margin-bottom:1.25rem}.reading-time i{font-size:0.75rem}.cross-book-links{margin-top:2.5rem;padding:1.5rem;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:0.75rem}.cross-book-links h3{margin-top:0;font-size:1.1rem;font-weight:600;margin-bottom:0.25rem}.cross-book-links h3 i{margin-right:0.3rem;color:var(--primary-color)}.cross-book-subtitle{font-size:0.85rem;color:var(--text-muted);margin-bottom:1rem}.cross-book-card{display:flex;align-items:center;gap:0.75rem;padding:0.65rem 1rem;background:var(--bg-color);border:1px solid var(--border-color);border-radius:0.5rem;text-decoration:none;color:var(--text-color);margin-bottom:0.5rem;transition:all 0.15s}.cross-book-card:last-child{margin-bottom:0}.cross-book-card:hover{border-color:var(--primary-color);box-shadow:0 2px 8px rgba(0,0,0,0.06);color:var(--text-color);text-decoration:none}.color-dot{width:10px;height:10px;border-radius:50%;flex-shrink:0}.cross-book-title{font-weight:600;font-size:0.9rem;white-space:nowrap}.cross-book-chapter{font-size:0.82rem;color:var(--text-muted);margin-left:auto;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}@media (max-width:767.98px){.cross-book-card{flex-wrap:wrap}.cross-book-chapter{margin-left:1.75rem;width:100%}}.chapter-summary{background:linear-gradient(135deg,var(--primary-subtle) 0%,var(--bg-secondary) 100%);border-left:4px solid var(--primary-color);border-radius:0 0.5rem 0.5rem 0;padding:1rem 1.25rem;margin-bottom:1.5rem;font-size:0.95rem;color:var(--text-color);line-height:1.6}.chapter-summary p{margin:0}.glossary-meta{color:var(--text-muted);margin-bottom:1.5rem}.glossary-letters{display:flex;flex-wrap:wrap;gap:0.35rem;margin-bottom:2rem;padding:0.75rem;background:var(--bg-secondary);border-radius:0.5rem}.glossary-letters a{display:inline-flex;align-items:center;justify-content:center;width:2rem;height:2rem;border-radius:0.25rem;color:var(--primary-color);text-decoration:none;font-weight:600;font-size:0.85rem;transition:all 0.15s}.glossary-letters a:hover{background:var(--primary-color);color:#fff}.glossary-section h2{font-size:1.5rem;color:var(--primary-color);border-bottom:2px solid var(--primary-color);padding-bottom:0.3rem;margin-top:2rem}.glossary-list dt{font-weight:700;font-size:1rem;margin-top:1rem;color:var(--heading-color)}.glossary-list dd{margin-left:0;padding-left:1rem;border-left:2px solid var(--border-color);margin-bottom:0.75rem;color:var(--text-color)}.glossary-source{font-size:0.8rem;color:var(--primary-color);text-decoration:none}.glossary-source:hover{text-decoration:underline}.topic-hub-header{text-align:center;padding:2rem 1rem 2.5rem}.topic-hub-icon{font-size:2.5rem;color:#0d6efd;margin-bottom:0.75rem}.topic-hub-header h1{border:none;padding-bottom:0;margin-bottom:0.75rem}.topic-hub-desc{color:var(--text-muted);font-size:1.05rem;max-width:600px;margin:0 auto 0.75rem}.topic-hub-count{font-size:0.85rem;color:var(--text-muted);background:var(--bg-secondary);padding:0.25rem 0.75rem;border-radius:2rem}.topic-hub-chapters{display:flex;flex-direction:column;gap:0.5rem}.topic-hub-card{display:flex;align-items:center;gap:0.75rem;padding:0.85rem 1rem;background:var(--bg-color);border:1px solid var(--border-color);border-radius:0.5rem;text-decoration:none;color:var(--text-color);transition:all 0.15s}.topic-hub-card:hover{border-color:var(--primary-color);box-shadow:0 2px 8px rgba(0,0,0,0.06);color:var(--text-color);text-decoration:none}.topic-hub-card-text{flex:1;min-width:0}.topic-hub-card-title{display:block;font-weight:600;font-size:0.95rem}.topic-hub-card-book{display:block;font-size:0.8rem;color:var(--text-muted)}.topic-hub-arrow{color:var(--text-muted);flex-shrink:0}.topics-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1rem}.topic-card{display:flex;align-items:flex-start;gap:1rem;padding:1.25rem;background:var(--bg-color);border:1px solid var(--border-color);border-radius:0.75rem;text-decoration:none;color:var(--text-color);transition:all 0.2s}.topic-card:hover{border-color:#0d6efd;box-shadow:0 4px 12px rgba(0,0,0,0.08);color:var(--text-color);text-decoration:none}.topic-card-icon{font-size:1.5rem;color:#0d6efd;flex-shrink:0;margin-top:0.1rem}.topic-card-body h2{font-size:1.05rem;font-weight:600;margin:0 0 0.25rem;border:none;padding:0}.topic-card-body p{font-size:0.8rem;color:var(--text-muted);margin:0}.search-box{margin:1.5rem 0}.search-input{width:100%;padding:0.85rem 1.25rem;font-size:1.1rem;border:2px solid var(--border-color);border-radius:0.75rem;background:var(--bg-color);color:var(--text-color);outline:none;transition:border-color 0.2s}.search-input:focus{border-color:#0d6efd;box-shadow:0 0 0 3px rgba(13,110,253,0.15)}.search-filters{display:flex;flex-wrap:wrap;gap:0.35rem;margin-top:0.75rem}.search-filter-btn{display:inline-flex;align-items:center;gap:0.3rem;padding:0.3rem 0.7rem;border:1px solid var(--border-color);border-radius:2rem;background:var(--bg-secondary);color:var(--text-muted);font-size:0.78rem;cursor:pointer;transition:all 0.15s}.search-filter-btn:hover{border-color:#0d6efd;color:#0d6efd}.search-filter-btn.active{background:#0d6efd;border-color:#0d6efd;color:#fff}.search-status{font-size:0.85rem;color:var(--text-muted);margin-bottom:1rem}.search-results{display:flex;flex-direction:column;gap:0.5rem}.search-result-card{display:flex;align-items:flex-start;gap:0.75rem;padding:0.85rem 1rem;background:var(--bg-color);border:1px solid var(--border-color);border-radius:0.5rem;text-decoration:none;color:var(--text-color);transition:all 0.15s}.search-result-card:hover{border-color:#0d6efd;box-shadow:0 2px 8px rgba(0,0,0,0.06);color:var(--text-color);text-decoration:none}.search-result-card .color-dot{margin-top:0.35rem}.search-result-text{flex:1;min-width:0}.search-result-title{display:block;font-weight:600;font-size:0.95rem}.search-result-book{display:block;font-size:0.78rem;color:var(--primary-color);margin-bottom:0.2rem}.search-result-desc{display:block;font-size:0.82rem;color:var(--text-muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.sitemap-jump{display:flex;flex-wrap:wrap;gap:0.5rem;margin-bottom:2rem;padding:1rem;background:var(--bg-secondary);border-radius:0.5rem}.sitemap-jump a{display:inline-flex;align-items:center;gap:0.35rem;padding:0.35rem 0.75rem;border:1px solid var(--border-color);border-radius:2rem;font-size:0.82rem;color:var(--text-color);text-decoration:none;transition:all 0.15s}.sitemap-jump a:hover{border-color:var(--primary-color);color:var(--primary-color)}.sitemap-book{margin-bottom:2.5rem}.sitemap-book h2{font-size:1.3rem}.sitemap-book h2 a{color:var(--heading-color);text-decoration:none}.sitemap-book h2 a:hover{color:var(--primary-color)}.sitemap-part h3{font-size:0.85rem;font-weight:700;text-transform:uppercase;letter-spacing:0.03em;color:var(--text-muted);margin-top:1rem;margin-bottom:0.5rem}.sitemap-part ul{list-style:none;padding-left:0}.sitemap-part ul ul{padding-left:1.25rem}.sitemap-part li{padding:0.2rem 0}.sitemap-part a{color:var(--text-color);text-decoration:none;font-size:0.88rem}.sitemap-part a:hover{color:var(--primary-color)}.back-to-top{position:fixed;bottom:2rem;right:2rem;width:42px;height:42px;border-radius:50%;background:var(--primary-color);color:#fff;border:none;cursor:pointer;font-size:1.1rem;display:flex;align-items:center;justify-content:center;opacity:0;transform:translateY(20px);transition:opacity 0.3s,transform 0.3s;pointer-events:none;z-index:900;box-shadow:0 2px 8px rgba(0,0,0,0.15)}.back-to-top.visible{opacity:1;transform:translateY(0);pointer-events:auto}.back-to-top:hover{filter:brightness(1.15)}.heading-anchor{color:var(--text-muted);text-decoration:none;font-size:0.7em;margin-left:0.4em;opacity:0;transition:opacity 0.2s;vertical-align:middle}h2:hover .heading-anchor,h3:hover .heading-anchor,h4:hover .heading-anchor,.heading-anchor:focus{opacity:0.6}.heading-anchor:hover{opacity:1;color:var(--primary-color)}.skip-to-content{position:absolute;top:-100%;left:50%;transform:translateX(-50%);background:var(--primary-color);color:#fff;padding:0.5rem 1.5rem;z-index:10000;border-radius:0 0 0.5rem 0.5rem;text-decoration:none;font-weight:600;transition:top 0.2s}.skip-to-content:focus{top:0}.book-stats{display:flex;gap:1.5rem;flex-wrap:wrap;margin:1rem 0 1.5rem;color:var(--text-muted);font-size:0.9rem}.book-stats span i{margin-right:0.3rem}.learning-paths-grid{display:grid;grid-template-columns:1fr;gap:1.5rem;margin-top:1.5rem}.path-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:0.75rem;padding:1.5rem;transition:box-shadow 0.2s}.path-card:hover{box-shadow:0 4px 16px rgba(0,0,0,0.08)}.path-card-header{display:flex;align-items:center;gap:0.75rem;margin-bottom:0.75rem}.path-card-header i{font-size:1.5rem;color:var(--primary-color)}.path-card-header h2{margin:0;border:none;padding:0;font-size:1.2rem}.path-meta{display:flex;gap:1rem;margin-bottom:0.75rem;font-size:0.85rem;color:var(--text-muted)}.difficulty-badge{display:inline-block;padding:0.15rem 0.6rem;border-radius:1rem;font-size:0.75rem;font-weight:600}.difficulty-badge.beginner{background:#d1fae5;color:#065f46}.difficulty-badge.intermediate{background:#fef3c7;color:#92400e}.difficulty-badge.advanced{background:#fee2e2;color:#991b1b}[data-bs-theme="dark"] .difficulty-badge.beginner{background:#064e3b;color:#6ee7b7}[data-bs-theme="dark"] .difficulty-badge.intermediate{background:#78350f;color:#fcd34d}[data-bs-theme="dark"] .difficulty-badge.advanced{background:#7f1d1d;color:#fca5a5}.path-steps{list-style:none;padding:0;margin:1rem 0 0;position:relative}.path-steps::before{content:'';position:absolute;left:14px;top:0;bottom:0;width:2px;background:var(--border-color)}.path-step{display:flex;align-items:flex-start;gap:0.75rem;padding:0.5rem 0;position:relative}.path-step-number{width:30px;height:30px;border-radius:50%;background:var(--primary-color);color:#fff;display:flex;align-items:center;justify-content:center;font-size:0.75rem;font-weight:700;flex-shrink:0;z-index:1}.path-step-content a{color:var(--text-color);text-decoration:none;font-weight:500}.path-step-content a:hover{color:var(--primary-color)}.path-step-book{font-size:0.8rem;color:var(--text-muted)}.path-step-desc{font-size:0.82rem;color:var(--text-muted);margin-top:0.15rem}.comparison-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.25rem;margin-top:1.5rem}.comparison-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:0.75rem;padding:1.25rem;display:flex;flex-direction:column;transition:box-shadow 0.2s,transform 0.2s;text-decoration:none;color:inherit;border-top:4px solid var(--card-color,var(--primary-color))}.comparison-card:hover{box-shadow:0 4px 16px rgba(0,0,0,0.08);transform:translateY(-2px)}.comparison-card h2{margin:0 0 0.5rem;border:none;padding:0;font-size:1.1rem}.comparison-card-meta{display:flex;flex-wrap:wrap;gap:0.5rem;margin-bottom:0.75rem}.comparison-card-meta span{font-size:0.8rem;color:var(--text-muted)}.comparison-card p{font-size:0.88rem;color:var(--text-muted);flex:1}.comparison-card .topics-list{display:flex;flex-wrap:wrap;gap:0.3rem;margin-top:0.5rem}.topic-tag{display:inline-block;padding:0.1rem 0.5rem;background:var(--bg-code);border-radius:0.75rem;font-size:0.72rem;color:var(--text-muted)}.comparison-start-btn{display:inline-block;margin-top:0.75rem;padding:0.35rem 1rem;background:var(--primary-color);color:#fff;border-radius:0.5rem;text-decoration:none;font-size:0.85rem;font-weight:500}.comparison-start-btn:hover{filter:brightness(1.1);color:#fff}