:root{--color-bg:#ffffff;--color-surface:#f7f9fc;--color-text:#17212f;--color-text-muted:#475467;--color-border:#e2e7ee;--color-heading:#0f2a5c;--color-accent:#1a56db;--color-accent-dark:#0f2a5c;--color-accent-soft:#e9f0fd;--color-code-bg:#0f1b33;--color-code-text:#e4ecf9;--color-callout-note-bg:#e9f0fd;--color-callout-note-border:#1a56db;--color-callout-warning-bg:#fef6ec;--color-callout-warning-border:#d97706;--color-callout-tip-bg:#ecfaf3;--color-callout-tip-border:#0d9257;--color-footer-bg:#0a1428;--header-height:68px;--max-content-width:1200px;--radius-sm:6px;--radius-md:10px;--radius-lg:14px;--shadow-sm:0 1px 2px rgba(15,17,40,0.06);--shadow-md:0 4px 16px rgba(15,17,40,0.08);--shadow-header:0 1px 0 var(--color-border),0 2px 12px rgba(15,17,40,0.04);--font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;--font-serif:Charter,"Iowan Old Style","Source Serif Pro",Georgia,"Times New Roman",serif;--font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace}*{box-sizing:border-box}html{padding-top:var(--header-height);scroll-behavior:smooth;-webkit-text-size-adjust:100%}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation-duration:0.01ms !important;transition-duration:0.01ms !important}}body{margin:0;font-family:var(--font-serif);color:var(--color-text);background:var(--color-bg);line-height:1.65;font-size:17px;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;font-variant-numeric:tabular-nums}.container{max-width:var(--max-content-width);margin:0 auto;padding:0 1.5rem}a{color:var(--color-accent);text-decoration-thickness:1px;text-underline-offset:2px}a:hover{color:var(--color-accent-dark)}a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px;border-radius:3px}header{position:fixed;top:0;left:0;right:0;height:var(--header-height);background:rgba(255,255,255,0.92);backdrop-filter:saturate(180%) blur(10px);-webkit-backdrop-filter:saturate(180%) blur(10px);box-shadow:var(--shadow-header);z-index:100}header .container{height:100%;display:flex;align-items:center;justify-content:space-between;gap:1.5rem}.header-nav{display:flex;align-items:center}.logo{font-family:var(--font-serif);font-size:1.4rem;font-weight:750;letter-spacing:-0.04em;color:var(--color-text);text-decoration:none;white-space:nowrap}.logo span{color:var(--color-accent)}#main-nav{list-style:none;display:flex;gap:2rem;margin:0;padding:0;white-space:nowrap}#main-nav a{text-decoration:none;color:var(--color-text-muted);font-weight:600;font-size:0.92rem;position:relative;padding:4px 0;transition:color 0.15s ease}#main-nav a::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--color-accent);transform:scaleX(0);transition:transform 0.15s ease}#main-nav a:hover{color:var(--color-text)}#main-nav a:hover::after{transform:scaleX(1)}.header-search{display:flex;align-items:center;flex:1;max-width:320px}.header-search-input{width:100%;padding:0.5rem 0.9rem;border:1px solid var(--color-border);border-radius:999px 0 0 999px;font-size:0.88rem;font-family:var(--font-serif);background:var(--color-surface);transition:border-color 0.15s ease,background 0.15s ease}.header-search-input:focus{background:var(--color-bg);border-color:var(--color-accent);outline:none}.header-search-btn{border:1px solid var(--color-border);border-left:none;border-radius:0 999px 999px 0;background:var(--color-surface);padding:0.5rem 0.85rem;cursor:pointer;line-height:1}.mobile-menu-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}.mobile-menu-toggle span{width:20px;height:2px;background:var(--color-text);display:block;border-radius:1px}@media (max-width:767px){.header-search{display:none}.mobile-menu-toggle{display:flex}#main-nav{display:none;position:absolute;top:var(--header-height);left:0;right:0;flex-direction:column;background:var(--color-bg);border-bottom:1px solid var(--color-border);box-shadow:var(--shadow-md);padding:0.75rem 1.5rem 1.25rem;gap:0}#main-nav.is-open{display:flex}#main-nav a{padding:0.7rem 0;border-bottom:1px solid var(--color-border)}#main-nav a::after{display:none}#main-nav li:last-child a{border-bottom:none}}main{padding:1.5rem 0 4rem}.content-wrapper{display:grid;grid-template-columns:1fr;gap:3rem}.content-wrapper:not(.no-sidebar){grid-template-columns:minmax(0,1fr) 280px}@media (max-width:900px){.content-wrapper:not(.no-sidebar){grid-template-columns:1fr}}article.main-content{max-width:720px;font-family:var(--font-serif);font-size:1.14rem;line-height:1.7}article.main-content h1{font-size:clamp(1.9rem,1.5rem + 1.6vw,2.5rem);font-weight:800;line-height:1.15;letter-spacing:-0.02em;margin:0 0 0.6rem;color:var(--color-heading)}article.main-content h2{font-size:1.4rem;font-weight:700;letter-spacing:-0.015em;margin-top:2.75rem;margin-bottom:0.9rem;padding-bottom:0.5rem;border-bottom:1px solid var(--color-border);color:var(--color-heading)}article.main-content h3{font-size:1.12rem;font-weight:700;margin-top:1.75rem;margin-bottom:0.5rem;color:var(--color-heading)}article.main-content p{margin:0 0 1.2rem}article.main-content li{color:var(--color-text)}article.main-content p,article.main-content li{max-width:68ch}article.main-content strong{color:var(--color-heading)}article.main-content code{font-family:var(--font-mono);background:var(--color-accent-soft);color:var(--color-accent-dark);padding:0.15em 0.45em;border-radius:5px;font-size:0.82em}article.main-content table{width:100%;border-collapse:collapse;margin:1.75rem 0;font-size:0.95rem;border:1px solid var(--color-border);border-radius:var(--radius-md);overflow:hidden}article.main-content th,article.main-content td{text-align:left;padding:0.7rem 1rem;border-bottom:1px solid var(--color-border)}article.main-content th{font-weight:700;background:var(--color-surface);font-size:0.85rem;text-transform:uppercase;letter-spacing:0.03em;color:var(--color-text-muted)}article.main-content tr:last-child td{border-bottom:none}nav.breadcrumb{border-bottom:1px solid var(--color-border);padding:0.4rem 0 1.1rem;margin-bottom:0.75rem}nav.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;align-items:center;gap:0.5rem;margin:0;padding:0;font-size:0.98rem;color:var(--color-text-muted)}nav.breadcrumb li{display:flex;align-items:center;gap:0.5rem}nav.breadcrumb li:not(:last-child)::after{content:"\203A";opacity:0.55}nav.breadcrumb a{color:var(--color-text-muted);text-decoration:none}nav.breadcrumb a:hover{color:var(--color-accent);text-decoration:underline}nav.breadcrumb li:last-child{color:var(--color-heading);font-weight:600}.toc{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:1.1rem 1.4rem;margin:1.75rem 0 2.25rem;box-shadow:var(--shadow-sm)}.toc-title{font-weight:700;font-size:0.82rem;text-transform:uppercase;letter-spacing:0.04em;color:var(--color-text-muted);margin:0 0 0.6rem}.sidebar{display:flex;flex-direction:column;gap:1.5rem}.sidebar-box{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:1.1rem 1.4rem;box-shadow:var(--shadow-sm)}.sidebar-title{font-weight:700;font-size:0.82rem;text-transform:uppercase;letter-spacing:0.04em;color:var(--color-text-muted);margin:0 0 0.7rem}.sidebar-box ul{list-style:none;margin:0;padding:0}.sidebar-box li{border-top:1px solid var(--color-border)}.sidebar-box li:first-child{border-top:none}.sidebar-box a{display:block;padding:0.55rem 0;font-size:0.92rem;color:var(--color-text);text-decoration:none}.sidebar-box a:hover{color:var(--color-accent)}@media (max-width:900px){.sidebar{flex-direction:row;flex-wrap:wrap;gap:1.25rem;margin-top:2.5rem}.sidebar-box{flex:1 1 240px}}.toc ul{margin:0;padding-left:1.1rem;font-size:0.92rem;line-height:1.9}.callout{border-left:3px solid var(--color-callout-note-border);background:var(--color-callout-note-bg);padding:1rem 1.25rem;border-radius:0 var(--radius-md) var(--radius-md) 0;margin:1.75rem 0}.callout--warning{border-color:var(--color-callout-warning-border);background:var(--color-callout-warning-bg)}.callout--tip{border-color:var(--color-callout-tip-border);background:var(--color-callout-tip-bg)}.callout p:last-child{margin-bottom:0}figure.diagram{margin:2.25rem 0;text-align:center;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:1.75rem 1rem 1.25rem}figure.diagram svg{max-width:100%;height:auto}figure.diagram figcaption{font-size:0.85rem;color:var(--color-text-muted);margin-top:0.75rem}.decision-tree{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:1.4rem 1.5rem;margin:1.75rem 0}.faq-item{margin:1.5rem 0;padding-bottom:1.5rem;border-bottom:1px solid var(--color-border)}.faq-item:last-child{border-bottom:none}.faq-item h3{font-size:1.05rem;margin-bottom:0.4rem}.faq-item p{margin:0}pre:not(.template-box){background:var(--color-code-bg);color:var(--color-code-text);padding:1.4rem;border-radius:var(--radius-md);overflow-x:auto;font-family:var(--font-mono);font-size:0.9rem;box-shadow:var(--shadow-md);white-space:pre-wrap;word-break:break-word}pre.diagram{white-space:pre;word-break:normal;overflow-x:auto}.template-box{position:relative;background:var(--color-code-bg);color:var(--color-code-text);padding:1.4rem;border-radius:var(--radius-md);overflow-x:auto;font-family:var(--font-mono);font-size:0.9rem;box-shadow:var(--shadow-md)}.template-copy-btn{position:absolute;top:0.65rem;right:0.65rem;background:rgba(255,255,255,0.1);color:#fff;border:1px solid rgba(255,255,255,0.25);border-radius:var(--radius-sm);padding:0.35rem 0.65rem;font-size:0.78rem;cursor:pointer;transition:background 0.15s ease}.template-copy-btn:hover{background:rgba(255,255,255,0.2)}.template-copy-btn-done{background:#0d9257;border-color:#0d9257}article.main-content dfn{font-style:normal;border-bottom:2px dotted var(--color-accent)}nav.page-nav{display:flex;justify-content:space-between;align-items:stretch;gap:1rem;margin:3rem 0 0;padding-top:1.5rem;border-top:1px solid var(--color-border)}nav.page-nav a{flex:0 1 48%;display:flex;align-items:center;padding:0.85rem 1.1rem;border:1px solid var(--color-border);border-radius:var(--radius-sm);text-decoration:none;color:var(--color-text);font-size:0.92rem;line-height:1.45;transition:border-color 0.15s ease,color 0.15s ease}nav.page-nav a:hover{border-color:var(--color-accent);color:var(--color-accent)}nav.page-nav .nav-next{justify-content:flex-end;text-align:right}@media (max-width:640px){nav.page-nav{flex-direction:column}nav.page-nav a{flex:1 1 auto}nav.page-nav .nav-next{justify-content:flex-start;text-align:left}}nav.related-concepts{margin-top:3.5rem;padding-top:1.75rem;border-top:1px solid var(--color-border)}nav.related-concepts h2{font-size:1.05rem;margin:0 0 0.9rem}nav.related-concepts ul{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:0.6rem}nav.related-concepts a{display:inline-block;padding:0.45rem 1rem;background:var(--color-surface);border:1px solid var(--color-border);border-radius:999px;text-decoration:none;font-size:0.88rem;font-weight:500;color:var(--color-text);transition:border-color 0.15s ease,color 0.15s ease}nav.related-concepts a:hover{border-color:var(--color-accent);color:var(--color-accent)}.btn{display:inline-flex;align-items:center;gap:0.5rem;padding:0.7rem 1.4rem;border-radius:var(--radius-sm);font-weight:600;font-size:0.95rem;text-decoration:none;cursor:pointer;border:1px solid transparent;transition:all 0.15s ease}.btn-primary{background:var(--color-accent);color:#fff;box-shadow:var(--shadow-sm)}.btn-primary:hover{background:var(--color-accent-dark);color:#fff}.btn-secondary{background:var(--color-bg);color:var(--color-text);border-color:var(--color-border)}.btn-secondary:hover{border-color:var(--color-accent);color:var(--color-accent)}.listen-btn{margin:0.9rem 0 1.6rem;padding:0.55rem 1.1rem;font-size:0.85rem}.listen-btn .listen-icon{font-size:0.7rem}.concept-list{display:inline-block;margin-top:0.35rem;font-size:0.93rem;line-height:1.9;color:var(--color-text-muted)}.concept-list a{color:var(--color-accent)}.search-page-input{width:100%;padding:1rem 1.1rem;font-size:1.05rem;border:1px solid var(--color-border);border-radius:var(--radius-md);font-family:var(--font-serif);margin-bottom:0.75rem;box-shadow:var(--shadow-sm);transition:border-color 0.15s ease}.search-page-input:focus{border-color:var(--color-accent);outline:none}.search-page-status{color:var(--color-text-muted);font-size:0.9rem;min-height:1.2em}.search-page-results{list-style:none;margin:0;padding:0}.search-page-group-label{font-size:0.78rem;text-transform:uppercase;letter-spacing:0.05em;color:var(--color-text-muted);margin-top:1.75rem;margin-bottom:0.4rem;font-weight:700}.search-page-results li:not(.search-page-group-label){border-bottom:1px solid var(--color-border)}.search-page-results a{display:block;padding:0.95rem 0.3rem;text-decoration:none;color:var(--color-text);border-radius:var(--radius-sm);transition:background 0.15s ease}.search-page-results a:hover{background:var(--color-surface)}.search-page-category{display:inline-block;margin-left:0.6rem;font-size:0.7rem;font-weight:600;color:var(--color-accent);border:1px solid var(--color-accent);border-radius:999px;padding:0.1rem 0.55rem;vertical-align:middle}.search-page-desc{display:block;font-size:0.88rem;color:var(--color-text-muted);margin-top:0.25rem}footer{background:var(--color-footer-bg);color:rgba(255,255,255,0.82);margin-top:5rem;padding:3.5rem 0 1.75rem}.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:2.5rem;margin-bottom:2.5rem}.footer-col h4{color:#fff;font-size:0.82rem;text-transform:uppercase;letter-spacing:0.04em;margin:0 0 1rem;font-weight:700}.footer-col ul{list-style:none;padding:0;margin:0}.footer-col li{margin-bottom:0.65rem}.footer-col a{color:rgba(255,255,255,0.65);text-decoration:none;font-size:0.9rem;transition:color 0.15s ease}.footer-col a:hover{color:#fff}.footer-bottom{border-top:1px solid rgba(255,255,255,0.1);padding-top:1.5rem;font-size:0.82rem;color:rgba(255,255,255,0.55);text-align:center}.footer-bottom p{margin:0.25rem 0}.back-to-top{position:fixed;bottom:1.5rem;right:1.5rem;width:44px;height:44px;border-radius:50%;background:var(--color-accent);color:#fff;box-shadow:var(--shadow-md);display:flex;align-items:center;justify-content:center;text-decoration:none;font-size:1.1rem;opacity:0;pointer-events:none;transition:opacity 0.2s ease,transform 0.2s ease;transform:translateY(8px)}.back-to-top.is-visible{opacity:1;pointer-events:auto;transform:translateY(0)}.back-to-top:hover{background:var(--color-accent-dark);color:#fff}@media (prefers-color-scheme:dark){:root{--color-bg:#0a1220;--color-surface:#121b2e;--color-text:#e6ecf7;--color-text-muted:#9fb0c6;--color-border:#223047;--color-heading:#a9c4f5;--color-accent:#5b93f0;--color-accent-dark:#a9c4f5;--color-accent-soft:#16213a;--color-callout-note-bg:#16213a;--color-callout-warning-bg:#2c2113;--color-callout-tip-bg:#0f2a1e}header{background:rgba(11,12,24,0.85)}.header-search-input,.header-search-btn{background:var(--color-surface);color:var(--color-text);border-color:var(--color-border)}article.main-content th{background:var(--color-surface)}.btn-secondary{background:var(--color-bg);border-color:var(--color-border);color:var(--color-text)}}