:root{--bg:#fff;--soft:#f5f8fc;--soft2:#edf4fb;--brand:#3f8fe5;--brand2:#245f9e;--deep:#153f66;--title:#16283c;--text:#43566a;--muted:#718296;--border:#dce7f2;--tag:#eaf4ff;--footer:#123958;--max:1240px;--radius:18px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;color:var(--text);background:#fff;line-height:1.72;overflow-x:hidden}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto;display:block}button,input,textarea{font:inherit}.skip-link{position:absolute;left:-9999px;top:8px;background:#fff;padding:10px;z-index:999}.skip-link:focus{left:8px}.safety-strip{padding:8px 20px;text-align:center;background:var(--soft2);color:#315779;font-size:13px;border-bottom:1px solid var(--border)}.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}.header-inner{max-width:var(--max);margin:auto;height:74px;display:flex;align-items:center;gap:26px;padding:0 24px}.brand{display:flex;align-items:center;flex:0 0 auto}.brand img{width:154px;height:auto}.desktop-nav{display:flex;align-items:center;justify-content:center;gap:3px;flex:1}.mega-wrap{position:static}.mega-trigger{appearance:none;border:0;background:transparent;color:var(--title);font-weight:650;padding:24px 10px;cursor:pointer;white-space:nowrap}.mega-trigger:hover,.mega-trigger:focus-visible{color:var(--brand2);outline:none}.mega-menu{position:absolute;left:50%;top:74px;transform:translateX(-50%);width:min(1120px,calc(100vw - 42px));background:#fff;border:1px solid var(--border);box-shadow:0 18px 45px rgba(33,72,110,.12);padding:28px;display:grid;grid-template-columns:1.1fr 1fr 1fr;gap:32px;z-index:110}.mega-menu[hidden]{display:none}.mega-intro{padding-right:24px;border-right:1px solid var(--border)}.eyebrow{display:inline-block;color:var(--brand2);font-size:13px;font-weight:750;letter-spacing:.04em;text-transform:uppercase}.mega-intro p{margin:12px 0 18px}.mega-intro a{color:var(--brand2);font-weight:700}.mega-links,.mega-featured{display:flex;flex-direction:column;gap:8px}.mega-links strong,.mega-featured strong{color:var(--title);margin-bottom:6px}.mega-links a{padding:6px 0}.mega-featured a{display:flex;justify-content:space-between;gap:12px;padding:10px 0;border-bottom:1px solid var(--border)}.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}.lang-link{font-weight:700;color:var(--title);padding:8px}.download-btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:10px 20px;background:var(--brand2);color:#fff;border-radius:10px;font-weight:750;border:1px solid var(--brand2)}.download-btn:hover{background:var(--deep)}.download-btn.compact{min-height:42px;padding:8px 15px}.menu-toggle{display:none;width:44px;height:44px;border:1px solid var(--border);background:#fff;border-radius:10px;padding:10px;flex-direction:column;justify-content:center;gap:5px}.menu-toggle span{height:2px;background:var(--title);display:block}.mobile-menu{position:fixed;inset:0;background:#fff;z-index:300;overflow:auto}.mobile-menu[hidden]{display:none}.mobile-menu-top{position:sticky;top:0;background:#fff;z-index:2;display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border)}.mobile-menu-tools{display:flex;align-items:center;gap:14px}.menu-close{width:44px;height:44px;border:1px solid var(--border);border-radius:10px;background:#fff;font-size:28px}.mobile-menu-body{padding:12px 20px}.mobile-group{border-bottom:1px solid var(--border)}.mobile-group-trigger{width:100%;height:52px;background:#fff;border:0;display:flex;justify-content:space-between;align-items:center;font-weight:750;color:var(--title);text-align:left}.mobile-group-panel{padding:0 0 14px 10px}.mobile-group-panel[hidden]{display:none}.mobile-group-panel a{display:block;padding:10px 0}.mobile-group-panel .overview{color:var(--brand2);font-weight:750}.mobile-menu-foot{padding:20px;display:grid;gap:12px;background:var(--soft)}main{min-height:60vh}.container{max-width:var(--max);margin:auto;padding:0 24px}.section{padding:88px 0}.section.soft{background:var(--soft)}.section.soft2{background:var(--soft2)}.hero{padding:68px 0 74px;background:linear-gradient(135deg,#fff 0%,#f5f8fc 62%,#edf4fb 100%)}.hero-grid{max-width:var(--max);margin:auto;padding:0 24px;display:grid;grid-template-columns:1.12fr .88fr;gap:56px;align-items:center}.hero h1{font-size:clamp(42px,5vw,72px);line-height:1.06;color:var(--title);letter-spacing:-.035em;margin:16px 0 22px}.hero-subtitle{font-size:20px;color:var(--brand2);font-weight:750;margin:0 0 16px}.hero-copy{font-size:17px;max-width:700px}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:26px 0}.secondary-link{display:inline-flex;align-items:center;min-height:46px;padding:10px 16px;border:1px solid var(--border);border-radius:10px;background:#fff;font-weight:700;color:var(--title)}.hero-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}.hero-tags span{font-size:13px;background:var(--tag);color:#2c628e;padding:6px 10px;border-radius:8px}.hero-visual{position:relative;min-height:460px;display:flex;align-items:center;justify-content:center}.hero-visual:before,.hero-visual:after{content:"";position:absolute;border:1px solid #cfe1f2;background:#fff;border-radius:24px}.hero-visual:before{inset:25px 10px 25px 65px;transform:rotate(-3deg)}.hero-visual:after{inset:55px 45px 10px 20px;transform:rotate(4deg);background:#edf4fb}.hero-visual img{position:relative;z-index:2;max-height:440px;object-fit:contain;filter:drop-shadow(0 20px 30px rgba(30,72,110,.16))}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:30px;margin-bottom:34px}.section-heading h2,.article-head h1{color:var(--title);margin:0;line-height:1.15}.section-heading h2{font-size:clamp(30px,4vw,48px)}.section-heading p{max-width:650px;margin:0}.task-nav{display:grid;grid-template-columns:1.15fr .9fr 1.2fr .95fr 1.1fr;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}.task-item{padding:24px 18px;border-right:1px solid var(--border)}.task-item:last-child{border-right:0}.task-num{color:var(--brand);font-weight:800;font-size:13px}.task-item h3{color:var(--title);margin:8px 0;font-size:18px}.task-item p{font-size:14px;margin:0 0 8px}.task-item a{font-weight:750;color:var(--brand2)}.mosaic{display:grid;grid-template-columns:1.2fr .8fr 1fr;grid-template-rows:auto auto;gap:18px}.panel{border:1px solid var(--border);background:#fff;padding:28px;border-radius:var(--radius)}.panel.large{grid-row:span 2;min-height:480px}.panel.wide{grid-column:span 2}.panel h3{color:var(--title);font-size:25px;margin:0 0 12px}.panel img{max-height:240px;margin:20px auto;object-fit:contain}.network-stage{display:grid;grid-template-columns:260px 1fr;gap:32px}.network-tabs{display:flex;flex-direction:column;gap:6px}.network-tab{border:0;background:transparent;text-align:left;padding:14px 16px;border-left:3px solid transparent;color:var(--text);font-weight:700}.network-tab[aria-selected="true"]{border-left-color:var(--brand);background:var(--soft2);color:var(--title)}.network-panel{display:grid;grid-template-columns:1.1fr .9fr;gap:30px;align-items:center;border:1px solid var(--border);padding:32px;border-radius:var(--radius);background:#fff}.network-panel[hidden]{display:none}.network-panel img{max-height:300px;margin:auto}.steps{position:relative;display:grid;grid-template-columns:repeat(6,1fr);gap:18px}.steps:before{content:"";position:absolute;left:5%;right:5%;top:25px;height:1px;background:var(--border)}.step{position:relative;padding-top:52px}.step:before{content:attr(data-step);position:absolute;top:0;left:0;width:48px;height:48px;border:1px solid var(--brand);background:#fff;color:var(--brand2);display:grid;place-items:center;border-radius:50%;font-weight:800}.step h3{color:var(--title);font-size:17px}.process-layout{display:grid;grid-template-columns:.8fr 1.2fr;gap:60px}.process-list{counter-reset:flow;display:grid;gap:0}.process-item{position:relative;padding:10px 0 22px 56px;border-left:1px solid var(--border);margin-left:18px}.process-item:before{counter-increment:flow;content:counter(flow);position:absolute;left:-18px;top:5px;width:36px;height:36px;background:#fff;border:1px solid var(--brand);border-radius:50%;display:grid;place-items:center;color:var(--brand2);font-weight:800}.process-item:last-child{border-left-color:transparent}.note{padding:18px 20px;border-left:4px solid var(--brand);background:var(--soft2);margin-top:22px}.security-band{background:var(--deep);color:#dcecff;padding:76px 0}.security-grid{max-width:var(--max);margin:auto;padding:0 24px;display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center}.security-band h2{color:#fff;font-size:clamp(34px,4vw,50px);margin-top:0}.security-band a{color:#fff;font-weight:750}.checklist{list-style:none;padding:0;margin:20px 0 0}.checklist li{padding:10px 0 10px 30px;position:relative;border-bottom:1px solid rgba(255,255,255,.12)}.checklist li:before{content:"✓";position:absolute;left:0;color:#bce0ff}.security-visual img{max-height:330px;margin:auto;filter:brightness(1.08)}.editorial-grid{display:grid;grid-template-columns:1.35fr .65fr;gap:44px}.featured-article{border-top:3px solid var(--brand);padding-top:22px}.featured-article h3{font-size:34px;color:var(--title);margin:8px 0 18px}.article-list{display:grid;gap:0}.article-row{padding:17px 0;border-bottom:1px solid var(--border)}.article-row small{color:var(--brand2);font-weight:800}.article-row h3{color:var(--title);margin:5px 0;font-size:18px}.split-knowledge{display:grid;grid-template-columns:1fr 1fr;gap:18px}.knowledge-col{padding:34px;border-top:2px solid var(--brand);background:#fff}.updates{display:grid;gap:0;border-top:1px solid var(--border)}.update-row{display:grid;grid-template-columns:160px 1fr 34px;gap:20px;align-items:start;padding:22px 0;border-bottom:1px solid var(--border)}.update-row small{color:var(--muted)}.update-row h3{margin:0 0 5px;color:var(--title)}.faq-list{max-width:920px}.faq-item{border-bottom:1px solid var(--border)}.faq-q{width:100%;min-height:58px;border:0;background:#fff;text-align:left;display:flex;justify-content:space-between;align-items:center;padding:16px 0;color:var(--title);font-weight:750}.faq-a{padding:0 0 18px}.faq-a[hidden]{display:none}.cta{padding:64px 0;background:var(--soft2)}.cta-inner{max-width:var(--max);margin:auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;gap:30px}.cta h2{margin:0;color:var(--title);font-size:34px}.site-footer{background:var(--footer);color:#c9daea;padding:58px 0 24px}.footer-grid{max-width:var(--max);margin:auto;padding:0 24px;display:grid;grid-template-columns:1.45fr .8fr .8fr .8fr;gap:44px}.footer-grid h2{color:#fff;font-size:16px;margin:0 0 14px}.footer-grid a{display:block;padding:6px 0}.footer-brand img{width:150px;filter:brightness(0) invert(1);margin-bottom:18px}.footer-alert{color:#fff}.footer-bottom{max-width:var(--max);margin:36px auto 0;padding:20px 24px 0;border-top:1px solid rgba(255,255,255,.12);display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;font-size:13px}.article-shell{max-width:var(--max);margin:auto;padding:56px 24px 88px}.breadcrumbs{font-size:13px;color:var(--muted);margin-bottom:22px}.article-head{max-width:880px;margin-bottom:38px}.article-head h1{font-size:clamp(38px,5vw,62px);margin-bottom:18px}.article-head .lead{font-size:19px}.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:54px}.article-content{max-width:820px}.article-content h2{color:var(--title);font-size:30px;line-height:1.25;margin:48px 0 14px;scroll-margin-top:120px}.article-content h3{color:var(--title);font-size:21px;margin:28px 0 10px}.article-content p{margin:0 0 18px}.article-content ul,.article-content ol{padding-left:22px}.article-content li{margin:7px 0}.article-callout{background:var(--soft2);border-left:4px solid var(--brand);padding:20px;margin:28px 0}.toc{position:sticky;top:110px;align-self:start;border-left:1px solid var(--border);padding-left:20px}.toc strong{color:var(--title)}.toc a{display:block;font-size:14px;padding:7px 0;color:var(--muted)}.toc a.active{color:var(--brand2);font-weight:750}.related{margin-top:48px;border-top:1px solid var(--border);padding-top:24px}.related-links{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.related-links a{border:1px solid var(--border);padding:18px;border-radius:12px;background:#fff}.terms{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.term{border-top:1px solid var(--border);padding:14px 0}.term strong{display:block;color:var(--title)}.maintenance{min-height:100vh;display:grid;place-items:center;padding:30px;background:var(--soft)}.maintenance-card{max-width:650px;background:#fff;border:1px solid var(--border);padding:48px;border-radius:20px;text-align:center}.maintenance-card img{width:180px;margin:0 auto 24px}.maintenance-card h1{color:var(--title);font-size:38px;margin:0 0 14px}.maintenance-card p{font-size:17px}.maintenance-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:25px}
@media(max-width:1100px){.desktop-nav{display:none}.menu-toggle{display:flex}.header-inner{height:68px}.mega-menu{top:68px}.hero-grid{grid-template-columns:1fr 1fr;gap:30px}.steps{grid-template-columns:repeat(3,1fr);row-gap:30px}.steps:before{display:none}.footer-grid{grid-template-columns:1.2fr 1fr 1fr}.footer-grid>div:last-child{grid-column:2}.task-nav{grid-template-columns:repeat(3,1fr)}.task-item:nth-child(3){border-right:0}.task-item:nth-child(n+4){border-top:1px solid var(--border)}}
@media(max-width:820px){.header-inner{padding:0 16px}.brand img{width:135px}.download-btn.compact{display:none}.section{padding:64px 0}.hero{padding:44px 0 60px}.hero-grid{grid-template-columns:1fr}.hero h1{font-size:46px}.hero-visual{min-height:360px}.hero-visual img{max-height:330px}.section-heading{align-items:start;flex-direction:column}.task-nav{grid-template-columns:1fr 1fr}.task-item{border-top:1px solid var(--border);border-right:1px solid var(--border)}.task-item:nth-child(even){border-right:0}.mosaic{grid-template-columns:1fr 1fr}.panel.large{grid-row:auto;min-height:auto}.panel.wide{grid-column:span 2}.network-stage{grid-template-columns:1fr}.network-tabs{flex-direction:row;overflow-x:auto;padding-bottom:6px}.network-tab{white-space:nowrap;border-left:0;border-bottom:3px solid transparent}.network-tab[aria-selected="true"]{border-bottom-color:var(--brand)}.network-panel{grid-template-columns:1fr}.steps{grid-template-columns:1fr}.step{padding:0 0 16px 64px;border-left:1px solid var(--border);margin-left:24px}.step:before{left:-24px}.process-layout,.security-grid,.editorial-grid,.split-knowledge,.article-layout{grid-template-columns:1fr}.toc{position:relative;top:auto;order:-1;border-left:0;border:1px solid var(--border);padding:16px;border-radius:12px}.footer-grid{grid-template-columns:1fr 1fr}.footer-grid>div:last-child{grid-column:auto}.cta-inner{align-items:flex-start;flex-direction:column}.related-links{grid-template-columns:1fr}.update-row{grid-template-columns:110px 1fr 20px}.terms{grid-template-columns:1fr}}
@media(max-width:520px){.safety-strip{font-size:12px;padding:7px 12px}.hero h1{font-size:38px}.hero-subtitle{font-size:17px}.hero-actions{display:grid}.secondary-link,.download-btn{width:100%}.hero-visual{min-height:300px}.task-nav{grid-template-columns:1fr}.task-item{border-right:0!important}.mosaic{grid-template-columns:1fr}.panel.wide{grid-column:auto}.footer-grid{grid-template-columns:1fr}.update-row{grid-template-columns:1fr 22px}.update-row small{grid-column:1}.article-shell{padding:38px 18px 64px}.article-head h1{font-size:38px}.article-content h2{font-size:27px}.maintenance-card{padding:30px 22px}.maintenance-card h1{font-size:31px}}

/* Content patterns */
body.menu-open{overflow:hidden}
a:focus-visible,button:focus-visible{outline:3px solid rgba(63,143,229,.38);outline-offset:3px}
.noscript-nav{max-width:var(--max);margin:0 auto;padding:12px 24px;display:flex;gap:16px;flex-wrap:wrap;border-bottom:1px solid var(--border);background:#fff}
.noscript-nav a{font-weight:700;color:var(--brand2)}
.deep-dive{margin-top:54px;padding-top:6px;border-top:1px solid var(--border)}
.practice-list{background:var(--soft);border-left:3px solid var(--brand);padding:18px 22px 18px 42px!important;margin:24px 0}
.product-article .article-head{position:relative;padding:34px 34px 36px;background:var(--soft);border:1px solid var(--border);border-radius:20px;max-width:980px}
.product-article .article-head:after{content:"";position:absolute;right:34px;bottom:-18px;width:110px;height:36px;border-bottom:2px solid var(--brand);border-right:2px solid var(--brand);opacity:.35}
.tutorial-article .article-content{counter-reset:guide}
.tutorial-article .article-content>section:not(.related):not(.deep-dive) h2:before{counter-increment:guide;content:counter(guide,decimal-leading-zero) "  ";color:var(--brand);font-size:.55em;vertical-align:middle;margin-right:8px}
.security-article .article-head{border-left:5px solid var(--deep);padding-left:28px}
.security-article .article-callout{background:#eaf4ff;border-left-color:var(--deep)}
.hub-article .article-head{max-width:1000px;border-bottom:1px solid var(--border);padding-bottom:30px}
.knowledge-article .article-head{max-width:920px}
.service-article{max-width:1120px}
.service-article h2{color:var(--title);font-size:30px;line-height:1.25;margin:48px 0 14px;scroll-margin-top:120px}
.service-article h3{color:var(--title)}
.service-article p{margin:0 0 18px}
.page-faq{max-width:none;border-top:1px solid var(--border)}
.page-faq .faq-item{background:#fff}
.page-faq .faq-q{font-size:17px}
.page-faq .faq-a{max-width:900px;color:var(--text)}
.faq-page-intro{padding:22px 24px;background:var(--soft2);border-left:4px solid var(--brand);max-width:920px}
.support-paths{display:grid;grid-template-columns:1.2fr .8fr .8fr 1.1fr;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.support-paths a{padding:24px 18px;border-right:1px solid var(--border);display:flex;flex-direction:column;gap:8px}
.support-paths a:last-child{border-right:0}
.support-paths strong{color:var(--title);font-size:18px}
.support-paths span{font-size:14px}
.principle-list{display:grid;grid-template-columns:1.2fr .8fr;gap:0;border-top:1px solid var(--border)}
.principle-list article{padding:22px 24px;border-bottom:1px solid var(--border)}
.principle-list article:nth-child(odd){border-right:1px solid var(--border)}
.principle-list strong{color:var(--title);font-size:18px}
@media(max-width:820px){
  .product-article .article-head{padding:26px 22px}
  .support-paths,.principle-list{grid-template-columns:1fr}
  .support-paths a,.principle-list article:nth-child(odd){border-right:0}
  .support-paths a{border-bottom:1px solid var(--border)}
}

/* Accessibility and compact mobile header refinements */
a:focus-visible,button:focus-visible{outline:3px solid #8fc3f5;outline-offset:3px}
a,button,.download-btn,.secondary-link,.network-tab,.faq-q,.mobile-group-trigger{touch-action:manipulation}
@media(max-width:820px){.header-inner{gap:8px}.header-actions{margin-left:auto;gap:6px}.download-btn.compact{display:inline-flex;min-height:44px;padding:7px 10px;font-size:12px}.lang-link{padding:6px;font-size:13px}.mobile-menu-body a,.mobile-menu-foot a{min-height:44px;display:flex;align-items:center}.mobile-group-trigger{min-height:48px;height:auto}}
@media(max-width:390px){.brand img{width:108px}.lang-link{font-size:12px;padding:4px}.download-btn.compact{padding:6px 8px;font-size:11px}.header-actions{gap:4px}}