:root{--blue:#3167ec;--ink:#172b4d;--muted:#64748b;--line:#e3e9f3;--pale:#f4f7fc;--sidebar:254px;--header:72px;font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif;color:var(--ink);font-size:15px;line-height:1.8;background:#fff}
*{box-sizing:border-box}body{margin:0}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}button,input{font:inherit}button{cursor:pointer}a,button,input,summary{outline-offset:4px}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #93b3ff}button{color:inherit}img{max-width:100%}[hidden]{display:none!important}
.skip{position:fixed;left:16px;top:-80px;z-index:99;background:#fff;padding:12px}.skip:focus{top:8px}.topbar{height:var(--header);position:fixed;inset:0 0 auto;z-index:20;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 28px;gap:24px}.brand{display:flex;align-items:center;gap:11px;min-width:202px;color:var(--ink);font-weight:750;font-size:21px;letter-spacing:1px}.brand:hover{text-decoration:none}.brand img{width:34px;height:34px;border-radius:9px}.brand span small{font-size:11px;font-weight:500;letter-spacing:.2px;display:block;line-height:1.2;color:var(--muted)}.top-label{color:var(--muted);border-left:1px solid var(--line);padding-left:22px;font-size:13px}.search-wrap{position:relative;margin-left:auto;width:360px}.search-wrap input{border:1px solid var(--line);background:var(--pale);border-radius:8px;padding:9px 64px 9px 15px;width:100%;font-size:13px;color:var(--ink)}.search-wrap kbd{position:absolute;right:12px;top:11px;font:11px/22px inherit;color:var(--muted);border:1px solid var(--line);padding:0 5px;background:white;border-radius:4px}.results{position:absolute;top:47px;right:0;width:430px;max-height:64vh;overflow:auto;border:1px solid var(--line);border-radius:10px;background:#fff;box-shadow:0 16px 45px #182b4d26;padding:8px}.results a{display:block;padding:10px 12px;border-radius:6px;color:var(--ink);line-height:1.6}.results a:hover{background:var(--pale);text-decoration:none}.results small{display:block;font-size:12px;color:var(--muted)}.results p{padding:12px;margin:0}.version{font-size:11px;background:#edf3ff;color:#3159a1;border-radius:5px;padding:4px 9px;white-space:nowrap}.menu-toggle{display:none;border:1px solid var(--line);border-radius:6px;background:#fff;padding:6px 11px}
.sidebar{position:fixed;top:var(--header);left:0;bottom:0;width:var(--sidebar);overflow-y:auto;overscroll-behavior:contain;background:#fbfcfe;border-right:1px solid var(--line);padding:24px 15px 26px;scrollbar-width:thin;scrollbar-color:#d9e1ed transparent}.sidebar .eyebrow{padding:0 13px 12px;margin:0}.nav-group{padding:3px 0}.nav-group summary{cursor:pointer;list-style:none;display:flex;align-items:center;gap:11px;font-weight:600;font-size:13px;padding:9px 13px;border-radius:6px;color:#344663}.nav-group summary::-webkit-details-marker{display:none}.nav-group summary:after{content:'›';margin-left:auto;transition:transform .15s;color:#9aa8bb}.nav-group[open] summary:after{transform:rotate(90deg)}.nav-group summary:hover{background:#f0f4fa}.nav-icon{width:19px;height:19px;display:inline-flex;color:#8290a8}.nav-icon svg{width:100%;height:100%}.nav-children{padding:2px 0 8px 17px}.nav-children a{display:block;padding:7px 12px 7px 26px;font-size:12.5px;color:#66758b;border-left:1px solid #e1e8f3;line-height:1.6}.nav-children a:hover{text-decoration:none;color:var(--blue)}.nav-children a[aria-current=page]{background:#eaf0ff;border-left:2px solid var(--blue);color:#235bdf;font-weight:650;border-radius:0 6px 6px 0;padding-left:25px}.sidebar-foot{font-size:11px;color:#7b889c;margin:24px 13px 0;padding-top:18px;border-top:1px solid var(--line)}
.layout{margin-left:var(--sidebar);padding:112px 44px 0;max-width:1520px;display:grid;grid-template-columns:minmax(0,900px) 154px;gap:46px}.main{min-width:0;padding-bottom:50px}.breadcrumbs{font-size:12px;color:#8190a5;margin-bottom:22px;display:flex;gap:9px;align-items:center}.breadcrumbs a{color:#71849c}.eyebrow{color:#6680a8;text-transform:uppercase;letter-spacing:1.7px;font-size:10px;font-weight:700}.article-head h1{font-size:36px;line-height:1.4;letter-spacing:-.8px;margin:10px 0 14px;color:#12294c}.article-head .lead{font-size:16px;color:#667891;line-height:1.9;max-width:730px;margin:0 0 19px}.meta{display:flex;flex-wrap:wrap;gap:12px;color:#8190a5;font-size:11px;border-bottom:1px solid var(--line);padding-bottom:24px;margin-bottom:26px}.meta span+span:before{content:'·';margin-right:12px}.route{background:#f5f8ff;border-left:3px solid #789df9;border-radius:0 6px 6px 0;padding:12px 16px;font-size:13px;margin-bottom:22px;color:#426083}.route strong{color:#315ba7;margin-right:10px;font-size:11px}.article-body h2{font-size:21px;margin:32px 0 15px;letter-spacing:-.3px;color:#1c3457;scroll-margin-top:96px}.article-body p{margin:10px 0;color:#465973;line-height:1.95}.article-body ul{padding-left:20px}.article-body li{margin:8px 0;color:#465973}.steps{list-style:none;padding:0!important;counter-reset:step;margin:15px 0}.steps li{position:relative;padding:0 0 15px 43px;margin:0;min-height:51px;counter-increment:step;border-left:1px solid #e3ebf8;margin-left:15px}.steps li:last-child{border-color:transparent;padding-bottom:0}.steps li:before{content:counter(step,decimal-leading-zero);position:absolute;left:-15px;top:0;width:30px;height:30px;display:grid;place-items:center;font-size:11px;font-weight:750;background:#eef3ff;border:3px solid #fff;border-radius:50%;color:#3367db}.steps li strong{color:#27466f}.warning{background:#fff8eb;border:1px solid #f2e3c5;border-radius:8px;padding:15px 18px;color:#7c5b25;line-height:1.8;font-size:13px;margin:20px 0}.warning strong{display:block;margin-bottom:4px}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:8px;margin:16px 0}table{width:100%;border-collapse:collapse;font-size:13px}th{text-align:left;background:#f5f8fc;color:#516b90;font-size:12px;padding:12px 16px;white-space:nowrap}td{padding:12px 16px;border-top:1px solid var(--line);vertical-align:top;color:#4b5f7a;min-width:120px}td:first-child{font-weight:600;color:#284567}tr:nth-child(even) td{background:#fcfdff}
.flow{border:1px solid var(--line);background:#f8faff;border-radius:9px;margin:22px 0;padding:17px 20px}.figure-label{font-size:10px;color:#8394b0;letter-spacing:.5px;margin:0 0 10px;display:flex;align-items:center;justify-content:space-between}.flow svg{width:100%;height:auto;display:block}.figure{margin:25px 0}.figure-frame{border:1px solid var(--line);border-radius:9px;overflow:hidden;background:#f6f8fc;position:relative}.figure-frame a{display:block;line-height:0;cursor:zoom-in}.figure-frame img{display:block;width:100%;height:auto}.expand-label{position:absolute;right:10px;bottom:10px;font-size:11px;color:#42618f;background:#ffffffed;border:1px solid #dce6f6;line-height:1;padding:8px 10px;border-radius:6px;pointer-events:none}.figure figcaption{font-size:11px;color:#8493a9;margin-top:8px;line-height:1.7}.image-notes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:15px 0 24px;list-style:none;padding:0!important}.image-notes li{font-size:12px;line-height:1.8;margin:0;border-left:2px solid #d8e5ff;padding-left:10px}.image-notes b{font-size:11px;color:#3367de;display:block}
.toc{position:sticky;top:104px;align-self:start;font-size:11px;color:#8090a6;padding:6px 0 12px 18px;border-left:1px solid var(--line)}.toc strong{color:#4c6382;font-size:11px;display:block;margin-bottom:10px}.toc a{display:block;padding:6px 0;color:#8592a6;line-height:1.6}.toc a:hover{color:var(--blue);text-decoration:none}.toc .stamp{border-top:1px solid var(--line);margin-top:19px;padding-top:15px;line-height:1.8;font-size:10px}.pager{display:flex;gap:14px;margin-top:38px;padding-top:22px;border-top:1px solid var(--line)}.pager a{display:block;width:50%;padding:12px 15px;border:1px solid var(--line);border-radius:8px;font-size:13px}.pager a:last-child{text-align:right}.pager small{display:block;font-size:10px;color:#8a99af;margin-bottom:3px}.related{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}.related a{font-size:12px;border-bottom:1px solid #cbdcff;padding-bottom:2px}.footer{font-size:10px;color:#92a0b4;margin-top:30px;display:flex;justify-content:space-between;gap:20px}.footer a{color:inherit}
.home-hero{position:relative;padding:5px 0 28px}.home-hero h1{font-size:43px;line-height:1.35;letter-spacing:-1.3px;margin:14px 0 20px;max-width:680px}.home-hero h1 em{font-style:normal;color:var(--blue)}.home-hero .lead{font-size:15px;line-height:2;max-width:620px;color:#6c7d96}.hero-actions{display:flex;gap:12px;margin:25px 0 10px}.button{display:inline-flex;align-items:center;justify-content:center;padding:11px 18px;border-radius:7px;border:1px solid var(--line);font-size:13px;background:white}.button:hover{text-decoration:none;background:#f4f7ff}.button.primary{background:var(--blue);color:white;border-color:var(--blue)}.button.primary:hover{background:#2455ce}.intro-label{display:flex;align-items:center;gap:7px;font-size:11px;letter-spacing:1px;color:#5679ae}.intro-label i{width:6px;height:6px;border-radius:50%;background:#4278ee}.section-title{display:flex;justify-content:space-between;align-items:baseline;margin:22px 0 13px}.section-title h2{font-size:19px;margin:0}.section-title span{font-size:11px;color:#95a2b5}.journey{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--line);border-radius:9px;overflow:hidden;margin-bottom:30px}.journey a{padding:20px 15px;border-right:1px solid var(--line);color:var(--ink)}.journey a:last-child{border:0}.journey a:hover{text-decoration:none;background:#f7faff}.journey .num{font-size:11px;font-weight:700;color:#5378bf;display:block;margin-bottom:10px}.journey b{display:block;font-size:13px}.journey small{font-size:11px;color:#8d9bb0;line-height:1.8;display:block;margin-top:5px}.chapter-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:11px}.chapter-card{display:flex;gap:13px;align-items:start;padding:18px 15px;border:1px solid var(--line);border-radius:8px;color:var(--ink)}.chapter-card:hover{border-color:#b6cdfb;background:#fbfcff;text-decoration:none}.chapter-card .nav-icon{width:24px;height:24px;color:#5b7bb4;flex-shrink:0;margin-top:4px}.chapter-card b{font-size:13px;display:block}.chapter-card small{color:#8a9bb2;font-size:10.5px;line-height:1.7;display:block;margin-top:3px}.home-tip{margin-top:28px;background:#f4f7fc;padding:17px 20px;border-radius:8px;font-size:12px;color:#6c7f9d}.home-tip strong{color:#385b91}.home-toc{color:#59769f;font-size:12px}
.image-dialog{width:min(96vw,1760px);max-width:96vw;height:auto;max-height:94vh;border:1px solid #d8e4f8;border-radius:10px;padding:0;background:#f5f7fc;color:#253f64}.image-dialog::backdrop{background:#0e2344c9}.dialog-top{display:flex;align-items:center;gap:12px;justify-content:space-between;padding:10px 18px;border-bottom:1px solid var(--line);font-size:12px;background:#fff;position:sticky;top:0}.dialog-top button{background:#f3f6fc;border:1px solid var(--line);border-radius:5px;padding:5px 12px;font-size:12px}.image-dialog img{display:block;width:auto;height:auto;max-width:100%;max-height:80vh;margin:auto}.image-dialog.zoomed img{max-height:none;max-width:none;width:auto}.image-dialog .image-stage{overflow:auto;max-height:82vh}.dialog-buttons{display:flex;gap:8px}.dialog-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.flow-mobile{display:none}
@media(max-width:600px){.flow svg{display:none}.flow-mobile{display:grid;grid-template-columns:1fr 1fr;gap:10px;list-style:none;margin:0;padding:0}.flow-mobile li{background:#fff;border:1px solid #dce6f7;border-radius:6px;padding:12px;font-size:13px;font-weight:600}.flow-mobile small{display:block;font-size:10px;color:#7f9ac4;margin-bottom:4px}}
@media(min-width:1800px){.layout{margin-right:auto;margin-left:calc(var(--sidebar) + (100vw - 1800px)/2)}}
@media(max-width:1250px){.layout{grid-template-columns:minmax(0,1fr);padding:105px 35px 0;gap:0}.toc{display:none}.top-label{display:none}.image-notes{grid-template-columns:1fr}.home-hero h1{font-size:38px}}
@media(max-width:800px){:root{--header:64px;--sidebar:234px}.topbar{padding:0 15px;gap:11px}.brand{font-size:17px;min-width:0}.brand img{width:30px;height:30px}.brand small,.version{display:none}.menu-toggle{display:block}.search-wrap{width:min(260px,45vw)}.search-wrap input{font-size:12px;padding:8px 10px}.search-wrap kbd{display:none}.results{position:fixed;left:12px;right:12px;top:65px;width:auto}.sidebar{z-index:18;box-shadow:12px 0 35px #19325115;display:none}.sidebar.open{display:block}.layout{margin-left:0;padding:91px 22px 0}.article-head h1{font-size:29px}.home-hero h1{font-size:34px}.chapter-grid{grid-template-columns:repeat(2,1fr)}.journey{grid-template-columns:repeat(2,1fr)}.journey a:nth-child(2){border-right:0}.journey a:nth-child(-n+2){border-bottom:1px solid var(--line)}.lead{font-size:14px!important}.meta{gap:6px}.flow{padding:12px 10px}.footer{display:block}.breadcrumbs{margin-bottom:18px}}
@media(max-width:430px){.brand span{display:none}.chapter-grid{grid-template-columns:1fr}.home-hero h1{font-size:30px}.hero-actions{flex-wrap:wrap}.article-body{font-size:14px}.dialog-top{padding:8px}.dialog-title{font-size:10px}.dialog-buttons button{padding:3px 5px}}
@media print{.topbar,.sidebar,.toc,.pager,.search-wrap,.hero-actions,.related,.expand-label{display:none!important}.layout{display:block;margin:0;padding:0;max-width:none}.main{padding:0}.article-body,.article-head{color:#000}.steps li,.figure,table,.flow{break-inside:avoid}.article-head h1{font-size:27px}.footer{margin-top:20px}.figure-frame img{max-height:300px;object-fit:contain}.image-dialog{display:none}}