:root{
  --bg:#fff;--bg-soft:#f5f8fc;--bg-blue:#edf4fb;--brand:#3f8fe5;--brand-deep:#245f9e;
  --navy:#153f66;--footer:#123958;--title:#16283c;--text:#43566a;--muted:#718296;--line:#dce7f2;
  --tag:#eaf4ff;--radius:18px;--shadow:0 16px 48px rgba(21,63,102,.10);--header-h:72px;--max:1240px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:110px}
body{margin:0;font-family:Arial,"Microsoft YaHei","PingFang SC",sans-serif;color:var(--text);background:var(--bg);line-height:1.72;overflow-x:hidden}
body.menu-open{overflow:hidden}
img,svg{max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
button{touch-action:manipulation}
.shell{width:min(var(--max),calc(100% - 40px));margin-inline:auto}
.skip-link{position:fixed;left:12px;top:-80px;background:#fff;border:2px solid var(--brand);padding:10px 14px;z-index:9999}
.skip-link:focus{top:12px}
.security-strip{background:var(--bg-blue);border-bottom:1px solid var(--line);font-size:13px;color:#385a78}
.security-strip .shell{padding:8px 0;text-align:center}
.site-header{position:sticky;top:0;z-index:1200;background:rgba(255,255,255,.96);backdrop-filter:blur(14px);border-bottom:1px solid rgba(220,231,242,.9)}
.header-row{height:var(--header-h);display:flex;align-items:center;gap:22px}
.brand{display:inline-flex;align-items:center;flex:0 0 auto}
.brand img{width:150px;height:42px;object-fit:contain;object-position:left center}
.desktop-nav{display:flex;align-items:center;gap:2px;flex:1;justify-content:center}
.nav-group{position:static}
.nav-trigger{min-height:44px;border:0;background:transparent;color:var(--title);font-weight:700;font-size:14px;padding:10px 11px;border-radius:10px;cursor:pointer}
.nav-trigger span{font-size:12px;margin-left:6px;color:var(--muted)}
.nav-trigger:hover,.nav-trigger:focus-visible,.nav-trigger[aria-expanded="true"]{background:var(--bg-soft);outline:none}
.mega-menu{position:absolute;left:50%;top:calc(100% + 1px);transform:translateX(-50%);width:min(1120px,calc(100vw - 40px));padding:28px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:0 0 18px 18px;display:grid;grid-template-columns:1.15fr 1fr .95fr;gap:30px}
.mega-menu[hidden]{display:none}
.mega-intro{padding-right:26px;border-right:1px solid var(--line)}
.eyebrow,.mega-label{font-size:12px;letter-spacing:.08em;text-transform:uppercase;font-weight:800;color:var(--brand-deep);margin:0 0 10px}
.mega-intro p:not(.eyebrow){margin:0 0 16px;font-size:14px;color:var(--muted)}
.text-link{font-weight:700;color:var(--brand-deep)}
.mega-links{display:grid;grid-template-columns:1fr 1fr;gap:6px 12px;align-content:start}
.mega-links .mega-label{grid-column:1/-1}
.mega-links a{padding:9px 8px;border-bottom:1px solid #edf2f7;color:var(--title);font-weight:700;font-size:14px}
.mega-links a:hover,.mega-featured a:hover{color:var(--brand-deep)}
.mega-featured{display:flex;flex-direction:column;gap:8px}
.mega-featured a{display:flex;justify-content:space-between;gap:10px;padding:10px 0;border-bottom:1px solid #edf2f7;color:var(--title);font-size:14px}
.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.lang-switch{min-height:44px;display:inline-flex;align-items:center;justify-content:center;padding:0 10px;color:var(--brand-deep);font-weight:800}
.download-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 22px;background:var(--brand-deep);color:#fff;border-radius:12px;font-weight:800;border:1px solid var(--brand-deep);transition:.2s ease}
.download-btn:hover{background:var(--navy);transform:translateY(-1px)}
.download-btn.compact{min-height:42px;padding:0 17px;font-size:14px}
.mobile-menu-button{display:none;min-height:44px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:0 12px;color:var(--title)}
.mobile-menu-button span{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
.mobile-menu-button b{font-size:20px}
.mobile-panel{position:fixed;inset:0;z-index:2000;background:#fff}
.mobile-panel[hidden]{display:none}
.mobile-panel-top{height:74px;display:flex;align-items:center;justify-content:space-between;padding:0 20px;border-bottom:1px solid var(--line)}
.mobile-panel-actions{display:flex;align-items:center;gap:10px}
.mobile-close{width:44px;height:44px;border:1px solid var(--line);background:#fff;border-radius:10px;font-size:28px;color:var(--title)}
.mobile-nav-scroll{height:calc(100vh - 74px);overflow:auto;padding:10px 20px 28px}
.mobile-nav-group{border-bottom:1px solid var(--line)}
.mobile-accordion{width:100%;min-height:52px;border:0;background:#fff;display:flex;align-items:center;justify-content:space-between;text-align:left;padding:0;color:var(--title);font-weight:800}
.mobile-subnav{padding:0 0 12px;display:grid;grid-template-columns:1fr 1fr;gap:6px 12px}
.mobile-subnav[hidden]{display:none}
.mobile-subnav a{min-height:44px;padding:10px 0;color:var(--text)}
.mobile-bottom-links{display:grid;gap:8px;margin-top:18px}
.mobile-bottom-links>a:not(.download-btn){padding:10px 0;border-bottom:1px solid var(--line);font-weight:700}
.section{padding:88px 0}
.section-soft{background:var(--bg-soft)}
.section-blue{background:var(--bg-blue)}
.section-dark{background:var(--navy);color:#d9e9f8}
.section-dark h2,.section-dark h3{color:#fff}
.section-dark p{color:#c8dced}
.kicker{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:800;color:var(--brand-deep);letter-spacing:.04em;margin-bottom:14px}
.kicker:before{content:"";width:30px;height:2px;background:var(--brand)}
h1,h2,h3,h4{color:var(--title);line-height:1.2;margin-top:0}
h1{font-size:clamp(38px,5.1vw,72px);letter-spacing:-.045em;margin-bottom:22px}
h2{font-size:clamp(28px,3.1vw,44px);letter-spacing:-.03em;margin-bottom:18px}
h3{font-size:22px;margin-bottom:10px}
p{margin:0 0 18px}
.lead{font-size:clamp(18px,2vw,22px);color:#526d86;max-width:760px}
.hero{padding:76px 0 70px;background:linear-gradient(180deg,#fff 0,#f7fbff 100%)}
.hero-grid{display:grid;grid-template-columns:1.18fr .82fr;gap:56px;align-items:center}
.hero-copy{position:relative;z-index:2}
.hero-sub{font-weight:800;color:var(--brand-deep);font-size:17px;margin-bottom:16px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:30px 0 20px}
.btn-secondary{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 20px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--title);font-weight:800}
.btn-secondary:hover{border-color:var(--brand);color:var(--brand-deep)}
.hero-links{display:flex;flex-wrap:wrap;gap:16px;font-size:14px;font-weight:700;color:var(--brand-deep)}
.capability-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px}
.capability-tags span{background:var(--tag);color:#315d85;padding:6px 10px;border-radius:8px;font-size:13px;font-weight:700}
.hero-art{position:relative;min-height:500px;display:flex;align-items:center;justify-content:center}
.hero-art:before{content:"";position:absolute;inset:8% 3% 6% 8%;background:var(--bg-blue);border:1px solid var(--line);border-radius:28px;transform:rotate(2deg)}
.hero-art:after{content:"";position:absolute;width:140px;height:140px;border:18px solid rgba(63,143,229,.12);right:-10px;top:18px;border-radius:50%}
.hero-art img{position:relative;z-index:2;max-height:470px;object-fit:contain;filter:drop-shadow(0 24px 30px rgba(21,63,102,.16))}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:30px;margin-bottom:40px}
.section-head p{max-width:620px;color:var(--muted)}
.task-strip{display:grid;grid-template-columns:1.25fr .9fr 1.1fr .95fr 1.2fr;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.task-item{padding:28px 22px;position:relative}
.task-item+.task-item{border-left:1px solid var(--line)}
.task-no{font-size:12px;font-weight:900;color:var(--brand);display:block;margin-bottom:10px}
.task-item h3{font-size:18px}
.task-item p{font-size:14px;color:var(--muted);min-height:72px}
.task-item a{color:var(--brand-deep);font-weight:800;font-size:14px}
.mosaic{display:grid;grid-template-columns:1.25fr .85fr .95fr;grid-auto-rows:minmax(190px,auto);gap:18px}
.mosaic>article{border:1px solid var(--line);border-radius:var(--radius);padding:28px;background:#fff;overflow:hidden;position:relative}
.mosaic .wide{grid-column:span 2}
.mosaic .tall{grid-row:span 2}
.mosaic article img{max-height:210px;object-fit:contain;margin-top:16px}
.mosaic .app-card{display:grid;grid-template-columns:1fr .7fr;gap:15px}
.mosaic .app-card img{max-height:330px}
.mosaic ul{padding-left:18px;margin:10px 0 0}
.network-stage{display:grid;grid-template-columns:280px 1fr;gap:34px}
.network-tabs{display:flex;flex-direction:column;border-left:2px solid var(--line)}
.network-tab{min-height:56px;border:0;background:transparent;text-align:left;padding:0 18px;font-weight:800;color:var(--muted);border-left:3px solid transparent;margin-left:-2px}
.network-tab[aria-selected="true"]{color:var(--brand-deep);border-left-color:var(--brand);background:#fff}
.network-panel{display:grid;grid-template-columns:1fr .72fr;gap:34px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:20px;padding:34px}
.network-panel[hidden]{display:none}
.no-js .network-panel[hidden]{display:grid}
.network-panel img{max-height:300px;object-fit:contain}
.steps-line{display:grid;grid-template-columns:repeat(6,1fr);gap:0;position:relative}
.steps-line:before{content:"";position:absolute;left:5%;right:5%;top:31px;height:1px;background:var(--line)}
.step{position:relative;padding:0 17px}
.step:nth-child(even){padding-top:54px}
.step-no{width:62px;height:62px;border:1px solid var(--line);background:#fff;border-radius:50%;display:grid;place-items:center;color:var(--brand-deep);font-weight:900;position:relative;z-index:2;margin-bottom:18px}
.step h3{font-size:17px}
.step p{font-size:14px;color:var(--muted)}
.web3-flow{display:grid;grid-template-columns:.8fr 1.2fr;gap:70px;align-items:start}
.flow-list{border-left:2px solid var(--line);counter-reset:flow}
.flow-list li{list-style:none;position:relative;padding:0 0 23px 26px;color:var(--title);font-weight:800}
.flow-list li:before{counter-increment:flow;content:counter(flow,decimal-leading-zero);position:absolute;left:-19px;top:-2px;width:36px;height:36px;background:#fff;border:1px solid var(--line);border-radius:50%;display:grid;place-items:center;color:var(--brand-deep);font-size:11px}
.note{padding:18px 20px;border-left:3px solid var(--brand);background:var(--bg-blue);border-radius:0 12px 12px 0;color:#315d85}
.security-layout{display:grid;grid-template-columns:1fr .85fr;gap:56px;align-items:center}
.security-visual{display:grid;grid-template-columns:.8fr 1fr;gap:18px;align-items:center}
.security-visual img{max-height:290px;object-fit:contain}
.check-list{list-style:none;padding:0;margin:0}
.check-list li{padding:11px 0 11px 28px;border-bottom:1px solid rgba(255,255,255,.12);position:relative}
.check-list li:before{content:"✓";position:absolute;left:0;color:#8fc9ff;font-weight:900}
.academy-layout{display:grid;grid-template-columns:1.2fr .8fr;gap:54px}
.feature-story{padding-right:36px;border-right:1px solid var(--line)}
.feature-story .topic-row{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}
.topic-row span{font-size:12px;background:var(--tag);padding:5px 8px;border-radius:6px;color:var(--brand-deep);font-weight:800}
.article-index{display:flex;flex-direction:column}
.article-index a{padding:16px 0;border-bottom:1px solid var(--line)}
.article-index small{display:block;color:var(--brand-deep);font-weight:800;margin-bottom:3px}
.article-index strong{display:block;color:var(--title);margin-bottom:4px}
.article-index span{font-size:13px;color:var(--muted)}
.pos-layout{display:grid;grid-template-columns:1fr 1fr;gap:34px}
.pos-layout article{padding:30px 0;border-top:2px solid var(--brand)}
.risk-panel{background:var(--bg-soft);padding:28px;border-radius:16px}
.updates-list{border-top:1px solid var(--line)}
.update-row{display:grid;grid-template-columns:130px 1fr auto;gap:26px;align-items:center;padding:20px 0;border-bottom:1px solid var(--line)}
.update-row small{color:var(--brand-deep);font-weight:800}
.update-row strong{color:var(--title)}
.update-row span{font-size:13px;color:var(--muted)}
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{width:100%;min-height:58px;border:0;background:transparent;display:flex;align-items:center;justify-content:space-between;text-align:left;color:var(--title);font-weight:800;padding:12px 0}
.faq-a{padding:0 36px 18px 0;color:var(--muted)}
.faq-a[hidden]{display:none}
.cta-band{display:grid;grid-template-columns:1fr auto;gap:30px;align-items:center;background:var(--bg-blue);border:1px solid var(--line);border-radius:22px;padding:38px}
.page-hero{padding:64px 0 48px;background:var(--bg-soft);border-bottom:1px solid var(--line)}
.breadcrumbs{font-size:13px;color:var(--muted);margin-bottom:20px}
.breadcrumbs a{color:var(--brand-deep)}
.page-hero h1{font-size:clamp(36px,4.2vw,58px);max-width:900px}
.article-wrap{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:70px;padding:64px 0 90px}
.article-content{min-width:0}
.article-content section{padding:0 0 42px;margin:0 0 42px;border-bottom:1px solid var(--line)}
.article-content section:last-child{border-bottom:0}
.article-content h2{font-size:32px;scroll-margin-top:120px}
.article-content h3{margin-top:24px}
.article-content p{font-size:16px}
.article-content ul,.article-content ol{padding-left:22px}
.article-content li{margin:8px 0}
.article-toc{position:sticky;top:108px;align-self:start;border-left:1px solid var(--line);padding-left:20px}
.article-toc strong{display:block;color:var(--title);margin-bottom:12px}
.article-toc a{display:block;padding:7px 0;font-size:13px;color:var(--muted)}
.article-toc a.active{color:var(--brand-deep);font-weight:800}
.article-callout{background:var(--bg-blue);border:1px solid var(--line);border-radius:14px;padding:20px;margin:26px 0}
.glossary-table{width:100%;border-collapse:collapse;margin:20px 0}
.glossary-table th,.glossary-table td{text-align:left;padding:12px;border-bottom:1px solid var(--line);vertical-align:top}
.glossary-table th{color:var(--title);background:var(--bg-soft)}
.site-footer{background:var(--footer);color:#d7e6f4;padding:62px 0 0}
.footer-grid{display:grid;grid-template-columns:1.45fr .8fr .8fr .8fr;gap:44px}
.footer-brand img{width:150px;filter:brightness(0) invert(1);margin-bottom:14px}
.footer-brand p{font-size:14px;color:#c1d6e9}
.footer-safety{padding-top:12px;border-top:1px solid rgba(255,255,255,.13)}
.site-footer h2{font-size:15px;color:#fff;margin-bottom:16px}
.site-footer a{display:block;padding:5px 0;font-size:14px;color:#c9dceb}
.site-footer a:hover{color:#fff}
.footer-bottom{margin-top:44px;border-top:1px solid rgba(255,255,255,.14);padding:18px 0;display:flex;align-items:center;justify-content:space-between;gap:20px;font-size:12px;color:#9fbcd3}
.footer-bottom p{margin:0}
.footer-bottom div{display:flex;gap:16px}
.footer-bottom a{padding:0;display:inline}
:focus-visible{outline:3px solid rgba(63,143,229,.42);outline-offset:3px}
@media (max-width:1100px){
  .desktop-nav{display:none}.mobile-menu-button{display:inline-flex;align-items:center;justify-content:center}
  .header-row{gap:12px}.header-actions{margin-left:auto}
  .mosaic{grid-template-columns:1fr 1fr}.mosaic .wide{grid-column:span 2}.mosaic .tall{grid-row:auto}
  .steps-line{grid-template-columns:repeat(3,1fr);gap:34px}.steps-line:before{display:none}.step:nth-child(even){padding-top:0}
  .article-wrap{grid-template-columns:1fr}.article-toc{position:relative;top:0;order:-1;border-left:0;border:1px solid var(--line);border-radius:14px;padding:18px;display:grid;grid-template-columns:repeat(2,1fr);gap:4px 18px}
  .article-toc strong{grid-column:1/-1}
}
@media (max-width:820px){
  .shell{width:min(100% - 28px,var(--max))}
  .section{padding:64px 0}
  .hero{padding:48px 0}.hero-grid{grid-template-columns:1fr}.hero-art{min-height:370px;order:2}.hero-art img{max-height:360px}
  .section-head{align-items:start;flex-direction:column;margin-bottom:28px}
  .task-strip{grid-template-columns:1fr 1fr}.task-item+.task-item{border-left:0}.task-item:nth-child(even){border-left:1px solid var(--line)}
  .task-item{border-bottom:1px solid var(--line)}
  .mosaic{grid-template-columns:1fr}.mosaic .wide{grid-column:auto}.mosaic .app-card{grid-template-columns:1fr .65fr}
  .network-stage{grid-template-columns:1fr}.network-tabs{flex-direction:row;overflow-x:auto;border-left:0;border-bottom:1px solid var(--line);scrollbar-width:thin}
  .network-tab{flex:0 0 auto;border-left:0;border-bottom:3px solid transparent;margin:0;padding:0 16px}
  .network-tab[aria-selected="true"]{border-left:0;border-bottom-color:var(--brand)}
  .network-panel{grid-template-columns:1fr;padding:24px}
  .web3-flow,.security-layout,.academy-layout,.pos-layout{grid-template-columns:1fr;gap:34px}
  .feature-story{border-right:0;padding-right:0;border-bottom:1px solid var(--line);padding-bottom:28px}
  .security-visual{grid-template-columns:.8fr 1fr}
  .update-row{grid-template-columns:105px 1fr}.update-row>a{display:none}
  .cta-band{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}
}
@media (max-width:540px){
  .security-strip .shell{text-align:left}
  .brand img{width:125px}.header-actions{gap:4px}.download-btn.compact{padding:0 11px}.lang-switch{padding:0 7px}
  .hero-actions{display:grid}.hero-actions a{width:100%}.hero-links{gap:10px 14px}
  .task-strip{grid-template-columns:1fr}.task-item:nth-child(even){border-left:0}.task-item p{min-height:0}
  .mosaic .app-card{grid-template-columns:1fr}
  .steps-line{grid-template-columns:1fr;border-left:1px solid var(--line);margin-left:22px}.step{padding-left:36px}.step-no{margin-left:-68px}
  .security-visual{grid-template-columns:1fr}
  .article-wrap{padding-top:34px;gap:32px}.article-toc{grid-template-columns:1fr}
  .article-content h2{font-size:27px}
  .footer-grid{grid-template-columns:1fr}.footer-brand{grid-column:auto}.footer-bottom{align-items:flex-start;flex-direction:column}
  .mobile-subnav{grid-template-columns:1fr}
}

.mobile-toc{display:none;border:1px solid var(--line);border-radius:14px;background:#fff;padding:0 16px}
.mobile-toc summary{min-height:48px;display:flex;align-items:center;color:var(--title);font-weight:800;cursor:pointer}
.mobile-toc div{padding:0 0 14px;display:grid;gap:4px}
.mobile-toc a{padding:7px 0;color:var(--brand-deep);font-size:14px}
@media (max-width:1100px){
  .mobile-toc{display:block}
  .article-toc{display:none}
}