:root{--paper:#fff;--surface:#f7f9fc;--surface-2:#eef3f9;--ink:#152033;--ink-soft:#344257;--muted:#69778a;--line:#dfe6ef;--line-strong:#c7d1df;--blue:#2768df;--blue-dark:#174aaa;--blue-soft:#eaf2ff;--code:#111b2b;--sidebar:272px;--top:64px;--sans:Inter,"SF Pro Display","Segoe UI","PingFang SC","Microsoft YaHei",system-ui,sans-serif;--mono:"SFMono-Regular",Consolas,"Liberation Mono",monospace;--shadow:0 18px 55px rgba(25,52,92,.09)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:88px}body{margin:0;background:var(--paper);color:var(--ink-soft);font:15px/1.8 var(--sans);-webkit-font-smoothing:antialiased}a{color:inherit}button,input{font:inherit}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;left:20px;top:-60px;z-index:1000;padding:9px 14px;background:var(--ink);color:#fff;border-radius:8px;text-decoration:none}.skip-link:focus{top:12px}.reading-progress{position:fixed;top:0;left:0;right:0;height:2px;z-index:1001}.reading-progress span{display:block;width:0;height:100%;background:linear-gradient(90deg,#79bcff,var(--blue))}
.topbar{position:fixed;z-index:500;inset:0 0 auto;height:var(--top);display:grid;grid-template-columns:var(--sidebar) 1fr auto;align-items:center;padding:0 28px 0 22px;background:rgba(255,255,255,.92);border-bottom:1px solid var(--line);backdrop-filter:blur(18px)}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;color:var(--ink)}.brand img{width:34px;height:34px}.brand span{display:flex;align-items:baseline;gap:8px}.brand strong{font-size:17px;letter-spacing:-.02em}.brand small{font:9px var(--mono);letter-spacing:.14em;color:var(--muted)}.topbar-center{justify-self:center;color:var(--muted);font:10px var(--mono);letter-spacing:.08em;text-transform:uppercase}.version-dot{display:inline-block;width:6px;height:6px;margin-right:8px;border-radius:50%;background:#35ad75;box-shadow:0 0 0 4px rgba(53,173,117,.12)}.top-actions{display:flex;align-items:center;gap:24px;font-size:13px}.top-actions a{text-decoration:none;color:var(--muted);transition:color .18s}.top-actions a:hover{color:var(--ink)}.top-actions .download{padding:8px 16px;color:#fff;background:var(--ink);border-radius:7px}.top-actions .download:hover{color:#fff;background:var(--blue-dark)}.menu-button{display:none;width:40px;height:40px;border:0;background:transparent}.menu-button span{display:block;width:19px;height:1.5px;margin:5px auto;background:var(--ink)}
.site-grid{display:grid;grid-template-columns:var(--sidebar) minmax(0,1fr);padding-top:var(--top);min-height:100vh}.sidebar{position:fixed;z-index:300;top:var(--top);bottom:0;left:0;width:var(--sidebar);border-right:1px solid var(--line);background:var(--surface)}.sidebar-inner{height:100%;display:flex;flex-direction:column;padding:23px 18px 18px;overflow:auto}.chapter-filter{height:40px;display:flex;align-items:center;gap:8px;padding:0 10px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--muted)}.filter-icon{font-size:16px}.chapter-filter input{min-width:0;flex:1;border:0;outline:0;background:transparent;color:var(--ink);font-size:12px}.chapter-filter input::placeholder{color:#98a3b1}.chapter-filter kbd{font:9px var(--mono);padding:2px 5px;border:1px solid var(--line);border-radius:4px;background:var(--surface);color:#8a96a7}.toc-label{margin:25px 10px 9px;color:#8a96a7;font:9px var(--mono);letter-spacing:.13em}.toc{display:flex;flex-direction:column;gap:2px}.toc a{position:relative;display:grid;grid-template-columns:25px 1fr;gap:7px;align-items:start;padding:8px 10px;border-radius:7px;text-decoration:none;color:#657386;font-size:12px;line-height:1.45;transition:.16s}.toc a:hover{background:#fff;color:var(--ink)}.toc a.active{background:var(--blue-soft);color:var(--blue-dark);font-weight:600}.toc a.active::before{content:"";position:absolute;left:-18px;top:10px;bottom:10px;width:2px;background:var(--blue)}.toc-index{font:9px/1.8 var(--mono);color:#9aa7b6}.toc a.active .toc-index{color:var(--blue)}.toc-loading{padding:12px;color:#98a3b1;font-size:12px}.toc-empty{padding:14px 10px;color:#8b96a5;font-size:12px}.sidebar-foot{margin-top:auto;padding:22px 10px 0;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:5px}.sidebar-foot>span{color:#34a170;font:9px var(--mono);letter-spacing:.12em}.sidebar-foot a{font-size:11px;color:var(--muted);text-decoration:none}.sidebar-foot a:hover{color:var(--ink)}.sidebar-scrim{display:none}
.main{grid-column:2;min-width:0}.doc-hero{min-height:525px;display:grid;grid-template-columns:minmax(0,1.18fr) minmax(340px,.82fr);gap:72px;align-items:center;padding:80px clamp(38px,7vw,108px) 68px;border-bottom:1px solid var(--line);background:radial-gradient(circle at 81% 22%,rgba(69,147,255,.11),transparent 28%),linear-gradient(180deg,#fff,#fbfdff)}.eyebrow{font:10px var(--mono);letter-spacing:.13em;color:var(--blue);font-weight:600}.hero-copy h1{max-width:760px;margin:22px 0 21px;color:var(--ink);font-size:clamp(38px,4.4vw,65px);line-height:1.13;letter-spacing:-.045em}.hero-copy h1 span{font-weight:450;color:#4d5e75}.hero-copy>p{max-width:610px;margin:0;color:var(--muted);font-size:16px;line-height:1.9}.hero-actions{display:flex;align-items:center;gap:24px;margin-top:32px}.hero-actions a{text-decoration:none;font-size:13px;color:var(--muted)}.hero-actions a:hover{color:var(--ink)}.hero-actions .primary-action{padding:10px 17px;border-radius:7px;background:var(--blue);color:#fff}.hero-actions .primary-action:hover{color:#fff;background:var(--blue-dark)}
.hero-system{padding:22px;border:1px solid var(--line-strong);border-radius:12px;background:rgba(255,255,255,.86);box-shadow:var(--shadow);font-family:var(--mono)}.system-top{display:flex;align-items:center;gap:12px;color:#8591a0;font-size:8px;letter-spacing:.1em}.system-top i{height:1px;flex:1;background:var(--line)}.system-core{display:flex;align-items:center;gap:17px;margin-top:25px;padding:20px;border:1px solid #bed2f2;border-radius:9px;background:linear-gradient(135deg,#f6faff,#edf5ff)}.system-core img{width:48px;height:48px}.system-core div{display:flex;flex-direction:column;gap:4px}.system-core strong{font:600 15px var(--sans);color:var(--ink)}.system-core span{font-size:8px;color:#708097}.system-rail{display:grid;grid-template-columns:repeat(3,1fr);height:32px;padding:0 33px}.system-rail i{justify-self:center;width:1px;background:var(--line-strong)}.system-nodes{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.system-nodes span{padding:10px 4px;border:1px solid var(--line);border-radius:6px;background:#fff;text-align:center;color:#617087;font-size:8px;letter-spacing:.08em}.system-result{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:9px;margin-top:18px;padding-top:16px;border-top:1px solid var(--line);font-size:8px;color:var(--blue)}.system-result strong{letter-spacing:.09em}.system-result em{font-style:normal;color:#8995a5}
.document-meta{display:flex;gap:24px;max-width:900px;margin:0 auto;padding:24px 0;border-bottom:1px solid var(--line);color:#8a96a7;font:10px var(--mono);letter-spacing:.04em}.document-meta span+span{padding-left:24px;border-left:1px solid var(--line)}.document-meta a{margin-left:auto;text-decoration:none;color:var(--blue)}.document-content{max-width:900px;margin:0 auto;padding:58px 0 100px}.document-content section.doc-section{padding:0 0 74px;border-bottom:1px solid var(--line);margin-bottom:70px}.document-content section.doc-section:last-child{border-bottom:0;margin-bottom:0}.document-content h2{margin:0 0 32px;color:var(--ink);font-size:32px;line-height:1.35;letter-spacing:-.035em}.document-content h2 .section-number{display:block;margin-bottom:12px;color:var(--blue);font:10px var(--mono);letter-spacing:.14em}.document-content h3{margin:48px 0 17px;color:var(--ink);font-size:20px;line-height:1.45;letter-spacing:-.015em}.document-content h4{margin:34px 0 14px;color:var(--ink);font-size:16px}.document-content p{margin:15px 0;color:#46566c;line-height:1.95}.document-content strong{color:#23324a}.document-content a{color:var(--blue-dark);text-underline-offset:3px}.document-content ul,.document-content ol{margin:17px 0;padding-left:23px}.document-content li{padding-left:4px;margin:8px 0}.document-content li::marker{color:#7b91ad}.document-content blockquote{margin:25px 0;padding:17px 20px;border-left:3px solid var(--blue);background:var(--blue-soft);color:#334965;border-radius:0 8px 8px 0}.document-content blockquote p{margin:0;color:inherit}.document-content code{padding:2px 5px;border:1px solid #dfe6ef;border-radius:4px;background:#f3f6fa;color:#244f92;font:12px/1.5 var(--mono)}.code-block{position:relative;margin:24px 0;border-radius:10px;overflow:hidden;background:var(--code);box-shadow:0 10px 25px rgba(20,31,49,.1)}.code-head{display:flex;justify-content:space-between;align-items:center;padding:9px 13px;border-bottom:1px solid rgba(255,255,255,.08);color:#7f91aa;font:9px var(--mono);letter-spacing:.08em;text-transform:uppercase}.copy-code{border:0;background:transparent;color:#91a3ba;font:9px var(--mono);cursor:pointer}.copy-code:hover{color:#fff}.code-block pre{margin:0;padding:21px;overflow:auto}.code-block pre code{padding:0;border:0;background:transparent;color:#d4deeb;font:12px/1.75 var(--mono)}.table-wrap{overflow:auto;margin:24px 0;border:1px solid var(--line);border-radius:9px}.document-content table{width:100%;border-collapse:collapse;min-width:620px;font-size:13px}.document-content th{padding:12px 15px;background:var(--surface);color:#536176;text-align:left;font:600 10px var(--mono);letter-spacing:.05em}.document-content td{padding:13px 15px;border-top:1px solid var(--line);vertical-align:top;color:#4b5b70}.document-content td+td,.document-content th+th{border-left:1px solid var(--line)}.document-content img{max-width:100%}.loading-card{display:flex;align-items:center;gap:13px;padding:22px;border:1px solid var(--line);border-radius:10px;color:var(--muted)}.loading-card span{width:14px;height:14px;border:2px solid var(--line);border-top-color:var(--blue);border-radius:50%;animation:spin .8s linear infinite}.doc-error{padding:22px;border:1px solid #f0caca;border-radius:10px;background:#fff8f8;color:#8a3434}@keyframes spin{to{transform:rotate(360deg)}}
.doc-footer{max-width:900px;margin:0 auto 45px;padding:30px 0;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}.doc-footer>div{display:grid;grid-template-columns:auto auto;align-items:center;gap:0 10px}.doc-footer img{grid-row:1/3}.doc-footer strong{font-size:14px;color:var(--ink)}.doc-footer span{font-size:9px;color:var(--muted)}.doc-footer nav{display:flex;gap:21px}.doc-footer a{font-size:11px;text-decoration:none;color:var(--muted)}.doc-footer a:hover{color:var(--ink)}.noscript{position:fixed;inset:auto 20px 20px;z-index:1000;padding:14px;background:#fff5d7;border:1px solid #e8cf84;border-radius:8px;color:#6d5520}
@media(max-width:1150px){:root{--sidebar:246px}.doc-hero{grid-template-columns:1fr;gap:44px;padding-inline:58px}.hero-system{max-width:560px}.document-meta,.document-content,.doc-footer{max-width:760px}}
@media(max-width:840px){:root{--top:60px}.topbar{grid-template-columns:1fr auto;padding-inline:16px}.topbar-center,.top-actions{display:none}.menu-button{display:block}.site-grid{display:block}.sidebar{transform:translateX(-102%);width:min(86vw,320px);transition:transform .24s ease;box-shadow:var(--shadow)}body.menu-open .sidebar{transform:none}.sidebar-scrim{position:fixed;z-index:250;inset:var(--top) 0 0;display:block;border:0;background:rgba(15,28,47,.27);opacity:0;pointer-events:none;transition:opacity .2s}body.menu-open .sidebar-scrim{opacity:1;pointer-events:auto}.main{width:100%}.doc-hero{min-height:0;padding:68px 24px 52px}.hero-copy h1{font-size:clamp(36px,10vw,52px)}.hero-system{width:100%}.document-meta,.document-content,.doc-footer{max-width:none;margin-inline:24px}.document-meta{overflow:auto;white-space:nowrap}.document-content{padding-top:45px}.document-content h2{font-size:28px}.doc-footer{align-items:flex-start;gap:28px}.doc-footer nav{flex-wrap:wrap;justify-content:flex-end}}
@media(max-width:540px){.doc-hero{padding:51px 19px 40px}.hero-copy h1{font-size:35px}.hero-copy>p{font-size:14px}.hero-actions{gap:16px;flex-wrap:wrap}.hero-system{padding:16px}.system-core{padding:15px}.system-core img{width:39px;height:39px}.system-core span{font-size:7px}.system-nodes span{font-size:7px}.system-result{grid-template-columns:auto 1fr}.system-result em{display:none}.document-meta{margin-inline:19px;padding-block:18px}.document-meta span:nth-child(2){display:none}.document-content{margin-inline:19px;padding-bottom:60px}.document-content section.doc-section{padding-bottom:53px;margin-bottom:50px}.document-content h2{font-size:25px}.document-content h3{font-size:18px;margin-top:38px}.document-content p{font-size:14px}.document-content table{min-width:560px}.doc-footer{margin-inline:19px;display:block}.doc-footer nav{justify-content:flex-start;margin-top:20px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.loading-card span{animation:none}.sidebar{transition:none}}