:root{
  --bg:#ffffff;--soft:#f5f8fc;--soft2:#edf4fb;--brand:#3f8fe5;--brand-deep:#245f9e;
  --ink:#16283c;--body:#43566a;--muted:#718296;--line:#dce7f2;--tag:#eaf4ff;--dark:#153f66;
  --max:1200px;--header:72px;--radius:18px;--shadow:0 16px 40px rgba(25,65,100,.09)
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;overflow-x:hidden}
body{margin:0;color:var(--body);background:var(--bg);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.75;overflow-x:hidden}
img,svg{max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
button,a{touch-action:manipulation}
.container{width:min(calc(100% - 40px),var(--max));margin-inline:auto}
.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:16px;top:-80px;z-index:1000;background:#fff;color:var(--ink);padding:10px 14px;border:1px solid var(--line);border-radius:8px}
.skip-link:focus{top:16px}
:focus-visible{outline:3px solid rgba(63,143,229,.42);outline-offset:3px}
.safety-strip{background:var(--soft2);border-bottom:1px solid var(--line);font-size:13px;color:#36536f}
.safety-strip .container{padding:8px 0}
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border-bottom:1px solid rgba(220,231,242,.9)}
.header-inner{min-height:72px;display:flex;align-items:center;gap:22px}
.brand{display:inline-flex;align-items:center;flex:0 0 auto}
.brand img{width:138px;max-height:38px;object-fit:contain}
.desktop-nav{display:flex;align-self:stretch;align-items:stretch;gap:2px;flex:1;justify-content:center}
.nav-group{display:flex;align-items:stretch;position:relative}
.nav-trigger{border:0;background:transparent;color:var(--ink);font-weight:650;font-size:14px;padding:0 11px;min-height:46px;cursor:pointer;display:flex;align-items:center;gap:5px}
.nav-trigger:hover,.nav-trigger[aria-expanded="true"]{color:var(--brand-deep)}
.mega-menu{position:fixed;left:50%;transform:translateX(-50%);top:calc(var(--header) + 33px);width:min(calc(100vw - 48px),1080px);display:grid;grid-template-columns:1.05fr .9fr 1fr;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:16px;padding:28px;gap:28px;z-index:130}
.mega-menu[hidden]{display:none}
.mega-intro{padding-right:24px;border-right:1px solid var(--line)}
.eyebrow{margin:0 0 8px;color:var(--brand-deep);font-weight:750;letter-spacing:.02em}
.mega-intro p:not(.eyebrow){margin:0 0 15px;font-size:14px}
.text-link{font-weight:700;color:var(--brand-deep)}
.mega-heading{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:0 0 8px}
.mega-links,.mega-featured{display:flex;flex-direction:column}
.mega-links a,.mega-featured a{min-height:38px;padding:7px 8px;border-radius:8px;color:var(--ink)}
.mega-links a:hover,.mega-featured a:hover{background:var(--soft)}
.mega-featured a{display:flex;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line);border-radius:0}
.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.language-link{font-weight:700;color:var(--brand-deep);padding:9px 8px}
.download-btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:9px 18px;border-radius:10px;background:var(--brand);color:#fff;font-weight:750;box-shadow:0 6px 18px rgba(63,143,229,.18)}
.download-btn:hover{background:var(--brand-deep)}
.mobile-menu-btn{display:none;border:1px solid var(--line);background:#fff;color:var(--ink);min-width:44px;min-height:44px;border-radius:10px;cursor:pointer}
.mobile-menu{position:fixed;inset:0;z-index:300;background:#fff;overflow:auto}
.mobile-menu[hidden]{display:none}
.mobile-menu-top{position:sticky;top:0;background:#fff;display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-bottom:1px solid var(--line);z-index:2}
.mobile-menu-meta{display:flex;align-items:center;gap:14px}
.mobile-close{border:1px solid var(--line);background:#fff;width:44px;height:44px;border-radius:10px;font-size:28px;cursor:pointer}
.mobile-menu-body{padding:10px 18px 20px}
.mobile-nav-group{border-bottom:1px solid var(--line)}
.mobile-accordion{width:100%;height:52px;background:#fff;border:0;display:flex;align-items:center;justify-content:space-between;color:var(--ink);font-weight:750;text-align:left;cursor:pointer}
.mobile-accordion-panel{padding:0 0 12px 12px}
.mobile-accordion-panel[hidden]{display:none}
.mobile-accordion-panel a{display:block;min-height:44px;padding:9px 4px}
.mobile-overview{color:var(--brand-deep);font-weight:750}
.mobile-menu-bottom{padding:18px;display:grid;gap:10px;background:var(--soft)}
body.menu-open{overflow:hidden}
.hero{padding:72px 0 56px;background:linear-gradient(180deg,#fff 0,#f7fbff 100%)}
.hero-grid{display:grid;grid-template-columns:1.12fr .88fr;gap:54px;align-items:center}
.kicker{font-size:13px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--brand-deep);margin-bottom:14px}
.hero h1,.page-hero h1{font-size:clamp(38px,5vw,66px);line-height:1.08;letter-spacing:-.035em;color:var(--ink);margin:0 0 18px}
.hero-sub{font-size:clamp(19px,2vw,25px);color:#2d5277;margin:0 0 16px;font-weight:650}
.hero-copy{font-size:17px;max-width:680px;margin:0 0 26px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.hero-links{display:flex;gap:18px;flex-wrap:wrap;margin-top:22px}
.hero-links a{color:var(--brand-deep);font-weight:700}
.capability-tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:22px}
.capability-tags span{background:var(--tag);color:#285b8d;padding:5px 9px;border-radius:6px;font-size:13px}
.hero-visual{position:relative;min-height:480px;display:flex;align-items:center;justify-content:center;background:var(--soft2);border-radius:28px 8px 28px 8px;overflow:hidden}
.hero-visual:before,.hero-visual:after{content:"";position:absolute;border:1px solid rgba(63,143,229,.25)}
.hero-visual:before{width:320px;height:320px;border-radius:50%;right:-70px;top:-80px}
.hero-visual:after{width:190px;height:190px;left:22px;bottom:24px;transform:rotate(18deg)}
.hero-visual img{position:relative;z-index:1;max-height:430px;object-fit:contain;padding:20px}
.section{padding:78px 0}
.section-soft{background:var(--soft)}
.section-title{display:flex;justify-content:space-between;align-items:end;gap:32px;margin-bottom:34px}
.section-title h2{margin:0;color:var(--ink);font-size:clamp(28px,3.4vw,44px);line-height:1.18;letter-spacing:-.02em}
.section-title p{max-width:600px;margin:0}
.task-nav{display:grid;grid-template-columns:.8fr 1.15fr .9fr 1.15fr 1fr;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.task{padding:22px 18px;min-height:165px;border-right:1px solid var(--line)}
.task:last-child{border-right:0}
.task-num{font-size:12px;color:var(--brand-deep);font-weight:800}
.task h3{color:var(--ink);font-size:18px;margin:5px 0 7px}
.task p{font-size:14px;margin:0 0 8px}
.task a{color:var(--brand-deep);font-weight:700;font-size:14px}
.mosaic{display:grid;grid-template-columns:1.2fr .8fr .9fr;grid-template-rows:auto auto;gap:16px}
.mosaic-item{background:#fff;border:1px solid var(--line);padding:28px;min-height:240px}
.mosaic-item.large{grid-row:span 2;background:var(--soft2);border-radius:22px 8px 22px 8px}
.mosaic-item.wide{grid-column:span 2}
.mosaic-item h3{color:var(--ink);font-size:23px;margin:0 0 8px}
.mosaic-item img{max-height:190px;margin:16px auto 0;display:block}
.network-stage{display:grid;grid-template-columns:250px 1fr;gap:34px}
.network-tabs{display:flex;flex-direction:column;gap:6px}
.network-tab{border:0;background:transparent;text-align:left;padding:13px 14px;min-height:48px;color:var(--body);font-weight:700;border-left:3px solid transparent;cursor:pointer}
.network-tab[aria-selected="true"]{background:var(--tag);color:var(--brand-deep);border-left-color:var(--brand)}
.network-panel{display:grid;grid-template-columns:1fr .82fr;gap:30px;align-items:center;padding:30px;background:#fff;border:1px solid var(--line);border-radius:18px}
.js .network-panel[hidden]{display:none}
.network-panel img{max-height:270px;margin:auto}
.path{position:relative;max-width:1000px;margin:0 auto}
.path:before{content:"";position:absolute;left:50%;top:10px;bottom:10px;width:1px;background:var(--line)}
.path-step{width:50%;padding:10px 46px 18px 0;position:relative;text-align:right}
.path-step:nth-child(even){margin-left:50%;padding:10px 0 18px 46px;text-align:left}
.path-step:after{content:"";position:absolute;right:-6px;top:24px;width:11px;height:11px;background:#fff;border:3px solid var(--brand);border-radius:50%}
.path-step:nth-child(even):after{left:-6px;right:auto}
.path-step strong{display:block;color:var(--brand-deep);font-size:12px;letter-spacing:.08em}
.path-step h3{color:var(--ink);margin:3px 0 5px}
.path-step p{margin:0}
.web3-flow{display:grid;grid-template-columns:.75fr 1.25fr;gap:50px;align-items:start}
.flow-list{counter-reset:flow;display:grid;gap:0;border-top:1px solid var(--line)}
.flow-item{counter-increment:flow;display:grid;grid-template-columns:54px 1fr;gap:14px;padding:18px 0;border-bottom:1px solid var(--line)}
.flow-item:before{content:counter(flow,decimal-leading-zero);font-weight:800;color:var(--brand-deep)}
.security-band{background:var(--dark);color:#d9ebff;padding:76px 0}
.security-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:50px;align-items:center}
.security-band h2,.security-band h3{color:#fff}
.security-checks{display:grid;gap:12px}
.security-checks div{padding:12px 0;border-bottom:1px solid rgba(255,255,255,.17)}
.security-visual{background:rgba(255,255,255,.06);padding:24px;border-radius:18px}
.editorial{display:grid;grid-template-columns:1.25fr .75fr;gap:44px}
.feature-article{border-left:4px solid var(--brand);padding-left:24px}
.feature-article h3{font-size:30px;color:var(--ink);line-height:1.25;margin:5px 0 14px}
.article-index{border-top:1px solid var(--line)}
.article-index a{display:block;padding:15px 2px;border-bottom:1px solid var(--line)}
.article-index small{display:block;color:var(--muted)}
.pos-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:28px}
.pos-grid article{padding:28px;border-top:3px solid var(--brand);background:var(--soft)}
.notice-list{border-top:1px solid var(--line)}
.notice-row{display:grid;grid-template-columns:150px 1fr auto;gap:24px;padding:18px 0;border-bottom:1px solid var(--line);align-items:start}
.notice-label{font-size:12px;font-weight:800;color:var(--brand-deep);text-transform:uppercase;letter-spacing:.06em}
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{width:100%;min-height:56px;padding:15px 0;border:0;background:transparent;display:flex;justify-content:space-between;text-align:left;color:var(--ink);font-weight:750;cursor:pointer}
.faq-a{padding:0 34px 18px 0}
.cta{padding:56px 0;background:var(--soft2)}
.cta-inner{display:flex;justify-content:space-between;align-items:center;gap:30px}
.cta h2{color:var(--ink);margin:0 0 8px;font-size:32px}
.page-hero{padding:58px 0 44px;background:var(--soft)}
.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:18px}
.breadcrumb a{color:var(--brand-deep)}
.page-hero h1{font-size:clamp(36px,4vw,56px)}
.page-hero p{max-width:800px;font-size:18px;margin:0}
.article-wrap{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:54px;padding:56px 0 84px}
.article-content{min-width:0}
.article-content h2{scroll-margin-top:110px;color:var(--ink);font-size:30px;line-height:1.25;margin:52px 0 14px}
.article-content h2:first-child{margin-top:0}
.article-content h3{color:var(--ink);font-size:21px;margin:30px 0 8px}
.article-content p{margin:0 0 17px}
.article-content ul,.article-content ol{padding-left:22px}
.article-content li{margin:7px 0}
.article-lead{font-size:19px;color:#2f4b66}
.note{margin:28px 0;padding:18px 20px;border-left:4px solid var(--brand);background:var(--soft2)}
.risk-note{margin:30px 0;padding:20px;border:1px solid var(--line);background:#f9fbfd}
.risk-note strong{color:var(--ink)}
.toc{position:sticky;top:112px;align-self:start;border-left:1px solid var(--line);padding-left:20px}
.toc h2{font-size:13px;color:var(--muted);margin:0 0 10px;text-transform:uppercase;letter-spacing:.08em}
.toc a{display:block;padding:6px 0;font-size:14px}
.toc a.active{color:var(--brand-deep);font-weight:750}
.mobile-toc{display:none;margin:20px 0;border:1px solid var(--line);border-radius:10px;background:#fff}
.mobile-toc summary{padding:12px 14px;font-weight:750;color:var(--ink);cursor:pointer}
.mobile-toc nav{padding:0 14px 12px}
.mobile-toc a{display:block;padding:6px 0}
.checklist{display:grid;grid-template-columns:1fr 1fr;gap:10px 24px;margin:22px 0}
.checklist div{padding:10px 0;border-bottom:1px solid var(--line)}
.related{margin-top:46px;padding-top:28px;border-top:1px solid var(--line)}
.related-links{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.related-links a{padding:16px;border:1px solid var(--line);background:#fff}
.site-footer{background:#123958;color:#bcd0e3;padding:54px 0 18px}
.footer-grid{display:grid;grid-template-columns:1.35fr .75fr .75fr .75fr;gap:44px}
.site-footer h2{font-size:14px;color:#fff;margin:0 0 12px}
.site-footer a{display:block;padding:5px 0}
.footer-brand img{width:140px;filter:brightness(0) invert(1);margin-bottom:12px}
.footer-safety{color:#e7f3ff;font-weight:650}
.footer-bottom{border-top:1px solid rgba(255,255,255,.16);margin-top:34px;padding-top:18px;display:flex;gap:18px;flex-wrap:wrap;font-size:12px}
.footer-bottom span:nth-child(2){flex:1;min-width:260px}
@media (max-width:1100px){
  .desktop-nav{display:none}.mobile-menu-btn{display:inline-flex;align-items:center;justify-content:center}
  .header-actions .download-btn{padding:8px 13px}
  .hero-grid{grid-template-columns:1fr .85fr;gap:30px}
  .task-nav{grid-template-columns:1fr 1fr 1fr}.task:nth-child(3){border-right:0}.task:nth-child(n+4){border-top:1px solid var(--line)}
  .mosaic{grid-template-columns:1fr 1fr}.mosaic-item.large{grid-row:auto}.mosaic-item.wide{grid-column:span 2}
  .article-wrap{grid-template-columns:minmax(0,1fr) 220px;gap:34px}
}
@media (max-width:800px){
  :root{--header:64px}.container{width:min(calc(100% - 28px),var(--max))}
  .header-inner{min-height:64px;gap:10px}.brand img{width:118px}.language-link{padding:7px 4px}.header-actions{gap:6px}
  .hero{padding:42px 0}.hero-grid{grid-template-columns:1fr}.hero-visual{min-height:340px;order:2}.hero-visual img{max-height:320px}
  .section{padding:58px 0}.section-title{display:block}.section-title p{margin-top:12px}
  .task-nav{display:block}.task{border-right:0;border-bottom:1px solid var(--line);min-height:auto;padding:18px 0}.task:last-child{border-bottom:0}
  .mosaic{display:block}.mosaic-item{margin-bottom:12px;min-height:auto}.mosaic-item.wide{grid-column:auto}
  .network-stage{display:block}.network-tabs{flex-direction:row;overflow-x:auto;padding-bottom:8px;scrollbar-width:thin}.network-tab{flex:0 0 auto;border-left:0;border-bottom:3px solid transparent;white-space:nowrap}.network-tab[aria-selected="true"]{border-bottom-color:var(--brand);border-left:0}
  .network-panel{grid-template-columns:1fr;padding:20px}.network-panel img{max-height:220px}
  .path:before{left:6px}.path-step,.path-step:nth-child(even){width:100%;margin-left:0;padding:8px 0 22px 34px;text-align:left}.path-step:after,.path-step:nth-child(even):after{left:0;right:auto}
  .web3-flow,.security-grid,.editorial,.pos-grid{grid-template-columns:1fr;gap:28px}
  .notice-row{grid-template-columns:100px 1fr}.notice-row>a{grid-column:2}
  .cta-inner{display:block}.cta .download-btn{margin-top:18px}
  .article-wrap{display:block;padding-top:24px}.toc{display:none}.mobile-toc{display:block}
  .checklist{grid-template-columns:1fr}.related-links{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}
}
@media (max-width:480px){
  .container{width:min(calc(100% - 24px),var(--max))}
  .header-actions .download-btn{font-size:13px;padding:7px 10px}.brand img{width:106px}
  .hero h1,.page-hero h1{font-size:36px}.hero-sub{font-size:18px}.hero-copy{font-size:16px}
  .hero-actions{display:grid}.hero-actions .download-btn{width:100%}
  .hero-visual{min-height:290px}.hero-visual img{max-height:270px}
  .mosaic-item{padding:22px}.section{padding:48px 0}
  .notice-row{display:block}.notice-label{margin-bottom:5px}
  .footer-grid{grid-template-columns:1fr}.footer-brand{grid-column:auto}
}

.type-intro{margin:30px 0 10px;padding:24px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.product-overview{display:grid;grid-template-columns:1.15fr .85fr;gap:28px;align-items:center}
.product-overview .product-facts{display:grid;gap:0;border-top:1px solid var(--line)}
.product-overview .product-facts div{padding:12px 0;border-bottom:1px solid var(--line)}
.product-overview img{max-height:280px;margin:auto;display:block}
.tutorial-steps{counter-reset:tutorial;display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.tutorial-steps div{counter-increment:tutorial;padding:14px 18px 14px 0;border-right:1px solid var(--line);margin-right:18px}
.tutorial-steps div:last-child{border-right:0;margin-right:0}
.tutorial-steps div:before{content:counter(tutorial,decimal-leading-zero);display:block;font-size:12px;font-weight:800;color:var(--brand-deep);margin-bottom:5px}
.security-principles{background:var(--dark);color:#d9ebff;padding:24px;border-radius:16px}
.security-principles h3{color:#fff;margin-top:0}
.security-principles .principle-row{display:grid;grid-template-columns:1fr 1fr 1fr;gap:22px}
.security-principles .principle-row div{padding-top:12px;border-top:1px solid rgba(255,255,255,.2)}
.knowledge-strip{display:grid;grid-template-columns:1fr 1fr 1fr;gap:24px}
.knowledge-strip div{padding-top:12px;border-top:2px solid var(--brand)}
.service-intro{display:grid;grid-template-columns:1.1fr .9fr;gap:30px}
.service-intro aside{padding:20px;background:var(--soft);border-left:3px solid var(--brand)}
@media(max-width:800px){
  .product-overview,.service-intro{grid-template-columns:1fr}
  .tutorial-steps{grid-template-columns:1fr 1fr}
  .tutorial-steps div:nth-child(2){border-right:0}
  .security-principles .principle-row,.knowledge-strip{grid-template-columns:1fr}
}
@media(max-width:480px){.tutorial-steps{grid-template-columns:1fr}.tutorial-steps div{border-right:0;border-bottom:1px solid var(--line);margin-right:0}}