:root{--bg: #ffffff;--text: #1e293b;--text-muted: #64748b;--primary: #3b82f6;--primary-hover: #2563eb;--border: #e8ebef;--sidebar-bg: #ffffff;--hover-bg: #f1f5f9;--active-bg: #eff6ff;--header-h: 70px;--sidebar-w: 290px;--toc-w: 200px;--maxw: 1400px}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased}button{font-family:inherit;cursor:pointer;border:none;background:none}.topbar{position:sticky;top:0;z-index:50;height:var(--header-h);background:var(--bg);border-bottom:1px solid var(--border)}.topbar-inner{display:flex;align-items:center;height:100%;width:100%;max-width:var(--maxw);margin:0 auto;gap:0;padding:0 24px 0 0}.brand{display:flex;align-items:center;justify-content:flex-start;flex-shrink:0;width:var(--sidebar-w);padding:0 20px}.brand-link{display:inline-flex;align-items:center;gap:12px;cursor:pointer;-webkit-user-select:none;user-select:none}.brand-mark{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:8px;background:var(--primary);color:#fff;font-weight:700;font-size:15px}.brand-name{font-size:20px;font-weight:700;color:var(--text);letter-spacing:-.2px}.brand-logo{height:58px;width:auto;max-width:320px;object-fit:contain;display:block}.search-wrap{position:relative;flex:1;max-width:560px;margin:0 auto 0 0}.search-box{display:flex;align-items:center;gap:10px;padding:8px 16px;border:1px solid var(--border);border-radius:9999px;background:#f8fafc}.search-box:focus-within{border-color:var(--primary);background:#fff}.search-icon{color:var(--text-muted);flex-shrink:0}.search-box input{border:none;outline:none;background:transparent;width:100%;font-size:15px;color:var(--text)}.search-results{position:absolute;top:calc(100% + 6px);left:0;right:0;background:#fff;border:1px solid var(--border);border-radius:10px;box-shadow:0 12px 30px #0f172a1f;max-height:60vh;overflow-y:auto;padding:6px;z-index:60}.search-empty{padding:14px 12px;color:var(--text-muted);font-size:14px}.search-result{display:block;width:100%;text-align:left;padding:10px 12px;border-radius:8px}.search-result:hover{background:var(--hover-bg)}.search-result-title{display:block;font-size:14px;font-weight:600;color:var(--text)}.search-result-snippet{display:block;margin-top:3px;font-size:12.5px;color:var(--text-muted);line-height:1.45}.profile{flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;background:var(--hover-bg);color:var(--text-muted)}.layout{display:flex;max-width:var(--maxw);margin:0 auto;align-items:flex-start}.sidebar{width:var(--sidebar-w);flex-shrink:0;position:sticky;top:var(--header-h);height:calc(100vh - var(--header-h));overflow-y:auto;padding:24px 16px 40px;border-right:1px solid var(--border)}.sidebar-msg{padding:16px;color:var(--text-muted);font-size:14px}.nav-default{display:block;width:100%;text-align:left;padding:9px 12px;margin-bottom:16px;border-radius:6px;font-size:15px;font-weight:600;color:var(--text)}.nav-default:hover{background:var(--hover-bg)}.nav-default.active{color:var(--primary-hover);background:var(--active-bg)}.nav-section{margin-bottom:14px}.nav-section-btn{display:flex;align-items:center;gap:8px;width:100%;text-align:left;padding:8px 10px;border-radius:6px;font-size:14px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;color:var(--text)}.nav-section-btn:hover{background:var(--hover-bg)}.nav-section-btn svg{color:var(--text-muted);flex-shrink:0}.nav-label{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nav-chevron{display:inline-flex;align-items:center;flex-shrink:0}.nav-section-icon{color:var(--text-muted);flex-shrink:0}.nav-section-icon-img{width:18px;height:18px;object-fit:contain;flex-shrink:0;border-radius:3px}.nav-children{padding-left:14px;margin-top:4px;display:flex;flex-direction:column;gap:2px}.nav-empty{padding:6px 10px;font-size:12.5px;color:var(--text-muted)}.nav-article{display:flex;align-items:flex-start;gap:8px;width:100%;text-align:left;padding:8px 12px;border-radius:6px;font-size:14.5px;font-style:normal;line-height:1.45;color:var(--text-muted)}.nav-article:hover{background:var(--hover-bg);color:var(--text)}.nav-article.active{background:var(--active-bg);color:var(--primary-hover);font-weight:600}.nav-article svg{flex-shrink:0;opacity:.8;margin-top:2px}.nav-article span{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;text-overflow:ellipsis;word-break:break-word}.nav-sub-btn{display:flex;align-items:center;gap:8px;width:100%;text-align:left;padding:8px 10px;border-radius:6px;font-size:14px;font-weight:600;color:var(--text)}.nav-sub-btn:hover{background:var(--hover-bg)}.nav-sub-btn svg{color:var(--text-muted);flex-shrink:0}.nav-sub-children{padding-left:14px}.content-area{flex:1;min-width:0;padding:40px 48px 80px}.state-msg{padding:40px 0;color:var(--text-muted);font-size:15px}.state-msg.error{color:#dc2626}.article-layout{display:flex;gap:56px;align-items:flex-start}.article{flex:1;min-width:0;max-width:860px}.article-title{font-size:38px;line-height:1.2;font-weight:700;margin:0 0 12px;overflow-wrap:break-word;word-break:break-word}.article-summary{font-size:18px;color:var(--text-muted);line-height:1.5;margin:0 0 28px;overflow-wrap:break-word;word-break:break-word}.article-content{font-size:16px;line-height:1.7;color:#334155;overflow-wrap:break-word;word-break:break-word}.article-content h1,.article-content h2,.article-content h3,.article-content h4,.article-content p,.article-content li{overflow-wrap:break-word;word-break:break-word}.article-content h1{font-size:38px;font-weight:700;margin:36px 0 12px}.article-content h2{font-size:28px;font-weight:700;margin:32px 0 10px}.article-content h3{font-size:24px;font-weight:600;margin:26px 0 8px}.article-content h4{font-size:20px;font-weight:600;margin:22px 0 6px}.article-content p{margin:0 0 16px}.article-content ul,.article-content ol{margin:0 0 16px;padding-left:24px}.article-content li{margin:4px 0}.article-content a{color:var(--primary);text-decoration:none}.article-content a:hover{text-decoration:underline}.article-content img{max-width:100%;border-radius:8px;display:block;margin:16px auto;cursor:zoom-in}.lightbox{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1000;background:rgba(15,23,42,.85);display:flex;align-items:center;justify-content:center;padding:32px;cursor:zoom-out;animation:lightbox-fade .12s ease}@keyframes lightbox-fade{0%{opacity:0}to{opacity:1}}.lightbox-img{max-width:94vw;max-height:90vh;display:block;border-radius:10px;box-shadow:0 24px 70px #0000008c;cursor:default}.lightbox-close{position:fixed;top:20px;right:24px;width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;border:none;border-radius:50%;background:rgba(255,255,255,.15);color:#fff;cursor:pointer}.lightbox-close:hover{background:rgba(255,255,255,.28)}.article-content blockquote{margin:16px 0;padding:4px 16px;border-left:3px solid var(--border);color:var(--text-muted);font-style:italic;font-size:18px}.article-content blockquote p{font-style:italic;font-size:18px}.article-content code{background:#f1f5f9;padding:2px 6px;border-radius:4px;font-size:.9em;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.article-content pre{background:#0f172a;color:#e2e8f0;padding:16px;border-radius:8px;overflow-x:auto;margin:0 0 16px}.article-content pre code{background:none;padding:0;color:inherit}.article-content hr{border:none;border-top:1px solid var(--border);margin:28px 0}.article-content video{max-width:100%;display:block;border-radius:8px;margin:16px 0;background:#000}.article-content div[data-youtube-video]{margin:20px 0}.article-content div[data-youtube-video] iframe,.article-content iframe{width:100%;max-width:100%;aspect-ratio:16 / 9;height:auto;border:0;border-radius:8px;display:block}.article-content .callout{border-radius:8px;padding:14px 16px 14px 56px;margin:20px 0;border-left:4px solid;font-size:15px;line-height:1.65;position:relative}.article-content .callout:before{content:"";position:absolute;left:12px;top:10px;width:32px;height:32px;background-size:contain;background-repeat:no-repeat;background-position:center}.article-content .callout>:first-child{margin-top:0}.article-content .callout>:last-child{margin-bottom:0}.article-content .callout-tip{background:#fffbeb;border-color:#f59e0b;color:#78350f}.article-content .callout-tip:before{background-image:url(/icons/tip.svg)}.article-content .callout-warning{background:#fef2f2;border-color:#ef4444;color:#7f1d1d}.article-content .callout-warning:before{background-image:url(/icons/warning.svg)}.article-content .callout-important{background:#fef2f2;border-color:#ef4444;color:#7f1d1d}.article-content .callout a{color:inherit;text-decoration:underline}.article-content table{border-collapse:collapse;width:100%;margin:20px auto;font-size:14.5px;table-layout:fixed}.article-content th,.article-content td{border:1px solid var(--border);padding:10px 12px;text-align:left;vertical-align:top;overflow-wrap:break-word;word-break:break-word}.article-content th{background:#f8fafc;font-weight:600}.article-content tbody tr:nth-child(2n){background:#fcfdfe}.pager{display:flex;justify-content:space-between;gap:16px;margin-top:48px;padding-top:24px;border-top:1px solid var(--border)}.pager-spacer{flex:1 1 0}.pager-btn{flex:1 1 0;min-width:0;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 20px;border:1px solid var(--border);border-radius:10px;color:var(--text);transition:border-color .15s,background .15s}.pager-btn:hover{border-color:var(--primary);background:#f8fafc}.pager-btn svg{color:var(--text-muted);flex-shrink:0}.pager-labels{display:flex;flex-direction:column;min-width:0}.pager-btn:not(.align-right) .pager-labels{align-items:flex-end;text-align:right}.pager-btn.align-right .pager-labels{align-items:flex-start;text-align:left}.pager-dir{font-size:12px;color:var(--text-muted)}.pager-title{font-size:14px;font-weight:600;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.last-updated{margin-top:28px;font-size:13px;color:var(--text-muted)}.last-updated-date{position:relative;cursor:default}.last-updated-tooltip{position:absolute;bottom:calc(100% + 8px);left:0;z-index:30;background:#1e1e1e;color:#fff;padding:6px 10px;border-radius:8px;font-size:13px;line-height:1.2;white-space:nowrap;opacity:0;visibility:hidden;transition:opacity .12s ease;pointer-events:none;box-shadow:0 4px 12px #0003}.last-updated-date:hover .last-updated-tooltip{opacity:1;visibility:visible}.on-this-page{width:var(--toc-w);flex-shrink:0;position:sticky;top:calc(var(--header-h) + 40px);align-self:flex-start;max-height:calc(100vh - var(--header-h) - 80px);overflow-y:auto}.otp-title{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--text-muted);margin-bottom:12px}.on-this-page ul{list-style:none;margin:0;padding:0}.on-this-page li{margin:2px 0}.on-this-page button{text-align:left;width:100%;padding:4px 0;font-size:14px;color:var(--text-muted);line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;text-overflow:ellipsis;word-break:break-word}.on-this-page button:hover{color:var(--primary)}.otp-l2{padding-left:0}.otp-l3{padding-left:12px}.otp-l4{padding-left:24px}@media (max-width: 1100px){.on-this-page{display:none}}@media (max-width: 820px){.sidebar{display:none}.brand{min-width:0}.content-area{padding:24px 20px 60px}}