:root{
  --i4-navy:#10273b;
  --i4-navy-deep:#0a1b2b;
  --i4-blue:#2f7cf6;
  --i4-green:#16b67a;
  --i4-cyan:#42c7d9;
  --i4-page:#f3f8fb;
  --i4-line:#d9e6ed;
  --i4-text:#18324a;
  --i4-muted:#6a7f91;
}
*{box-sizing:border-box}
html{background:var(--i4-page);scroll-behavior:smooth}
body{margin:0;background:var(--i4-page);color:var(--i4-text);font-family:"Microsoft YaHei","PingFang SC","Segoe UI",Arial,sans-serif;line-height:1.8;overflow-x:hidden}
a{color:var(--i4-blue);transition:color .2s ease,background .2s ease,transform .2s ease}
.container{width:min(1200px,calc(100% - 48px));margin-inline:auto}
.ks-header.i4-header{position:sticky;top:0;z-index:50;height:76px;background:rgba(10,27,43,.97);border:0;box-shadow:0 8px 24px rgba(10,27,43,.16)}
.i4-header-inner{width:min(1200px,calc(100% - 48px));height:76px;margin:auto;display:flex;align-items:center;gap:28px}
.i4-brand{display:flex;align-items:center;gap:11px;color:#fff;text-decoration:none;min-width:220px}
.i4-brand img{width:45px;height:45px;object-fit:contain;border-radius:10px;background:#fff}
.i4-brand span{display:flex;flex-direction:column;line-height:1.1}
.i4-brand strong{font-size:19px;letter-spacing:0;font-weight:800}
.i4-brand em{margin-top:4px;font-size:10px;font-style:normal;color:#9bb1c2;letter-spacing:.4px}
.i4-nav{display:flex;align-items:stretch;gap:4px;flex:1;height:100%}
.i4-nav-link{display:flex;align-items:center;padding:0 17px;color:#d9e7ef;text-decoration:none;white-space:nowrap;font-size:15px}
.i4-nav-link:hover,.i4-nav-link.is-active{color:#fff;background:linear-gradient(135deg,rgba(47,124,246,.9),rgba(22,182,122,.88));border-radius:0 0 10px 10px}
.i4-header-cta{display:inline-flex;align-items:center;justify-content:center;height:42px;padding:0 20px;border-radius:9px;color:#fff;background:var(--i4-green);font-weight:700;text-decoration:none;white-space:nowrap}
.i4-header-cta:hover{background:#21c98b;color:#fff;transform:translateY(-1px)}
.ks-subnav{display:none!important}
.breadcrumb{padding:18px 0 10px;color:var(--i4-muted);font-size:14px}
.breadcrumb a{color:var(--i4-muted);text-decoration:none}
.breadcrumb span{padding:0 10px;color:#b5c3cd}
.i4-hero{position:relative;margin:0 0 42px;padding:74px 0 78px;background:linear-gradient(120deg,var(--i4-navy-deep) 0%,#123b50 55%,#0d665c 100%);color:#fff;overflow:hidden}
.i4-hero:after{content:"";position:absolute;inset:auto -12% -46% 42%;height:420px;background:radial-gradient(ellipse,rgba(66,199,217,.18),transparent 68%);pointer-events:none}
.i4-hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:minmax(0,1.15fr) minmax(380px,460px);align-items:center;gap:72px;min-height:430px}
.i4-hero-copy{min-width:0}
.i4-product-mark{display:flex;align-items:center;gap:12px;margin-bottom:25px;color:#fff;font-size:18px;font-weight:800}
.i4-product-mark img{width:45px;height:45px;border-radius:11px;background:#fff;object-fit:contain}
.i4-product-mark small{margin-left:7px;color:#9fd9d9;font-weight:500;font-size:13px}
.i4-hero h1{max-width:720px;margin:0;color:#fff;font-size:clamp(34px,4vw,56px);line-height:1.2;letter-spacing:0;font-weight:900}
.i4-update-line{margin:14px 0 18px;color:#9cc9d5;font-size:13px;line-height:1.6}
.i4-hero .hero-sub{max-width:700px;margin:0;color:#d3e2e9;font-size:17px;line-height:1.9}
.i4-hero .cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.i4-hero .cta-primary,.i4-hero .cta-secondary{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 22px;border-radius:9px;text-decoration:none;font-size:16px;font-weight:700}
.i4-hero .cta-primary{color:#fff;background:var(--i4-blue);box-shadow:0 8px 20px rgba(47,124,246,.25)}
.i4-hero .cta-secondary{color:var(--i4-navy);background:#fff}
.i4-hero .cta-primary:hover,.i4-hero .cta-secondary:hover{transform:translateY(-2px)}
.i4-hero .cta-meta{margin-top:16px;color:#9cc9d5;font-size:13px}
.i4-hero-visual{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:24px;min-width:0}
.i4-hero-img{display:block;width:100%;height:auto;border:1px solid rgba(255,255,255,.35);border-radius:14px;box-shadow:0 22px 44px rgba(0,0,0,.28)}
.i4-hero-dl{width:100%;max-width:440px;display:flex;flex-direction:column;gap:10px;align-items:center}
.i4-hero-dl-btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;width:100%;min-height:56px;border-radius:10px;color:#0a1b2b;background:linear-gradient(135deg,#42c7d9,#16b67a);font-size:18px;font-weight:800;text-decoration:none;box-shadow:0 10px 24px rgba(22,182,122,.28);transition:transform .2s ease}
.i4-hero-dl-btn:hover{transform:translateY(-2px);color:#0a1b2b}
.i4-hero-dl-btn svg{width:22px;height:22px}
.i4-hero-dl-meta{margin:0;color:#9cc9d5;font-size:13px;text-align:center;line-height:1.7}
.section{margin:0 0 34px}
.i4-module-heading{margin-top:0;margin-bottom:14px}
.i4-module-heading h2{margin:0;color:var(--i4-navy);line-height:1.35}
.i4-module-heading p{margin:0;color:var(--i4-muted);font-size:15px;line-height:1.8}
.faq-v2{width:min(1100px,calc(100% - 48px));margin:40px auto;padding:28px;background:#fff;border:1px solid var(--i4-line);border-radius:12px;box-shadow:0 8px 24px rgba(24,50,74,.05)}
.faq-v2>h2{margin:0 0 18px;color:var(--i4-navy);line-height:1.35}
.entity-card,.hub-grid-v2,.faq-block,.sidebar-card,.main-content>.section,.content-layout{border-color:var(--i4-line)}
.entity-card,.hub-card-v2,.sidebar-card,.faq-block{background:#fff;border-radius:12px;box-shadow:0 8px 24px rgba(24,50,74,.05)}
.entity-card{width:min(1100px,calc(100% - 48px));margin:0 auto 36px;padding:28px}
.entity-card h2,.section h2,.faq-block h2{margin:0 0 16px;color:var(--i4-navy);line-height:1.35}
.entity-grid{gap:0!important}
.entity-grid>div{padding:14px 16px;border-bottom:1px solid var(--i4-line)}
.entity-label{color:var(--i4-muted);font-size:13px}
.entity-value{margin-top:4px;color:var(--i4-text);font-size:15px;line-height:1.7;word-break:break-word}
.content-layout{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:32px;align-items:start}
.main-content{min-width:0}
.main-content>.container{width:100%!important;max-width:none!important;margin:0!important;padding:0 0 24px!important}
.main-content>.container h2{margin:0 0 16px;color:var(--i4-navy);line-height:1.4}
.sidebar{position:sticky;top:98px}
.sidebar-card{margin:0 0 18px;padding:20px}
.sidebar-card h3{margin:0 0 11px;color:var(--i4-navy);font-size:16px}
.sidebar-card ul{margin:0;padding:0;list-style:none}
.sidebar-card li+li{margin-top:9px}
.sidebar-card a{text-decoration:none;color:var(--i4-muted);font-size:14px}
.sidebar-card a:hover{color:var(--i4-blue)}
.hub-grid-v2{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;width:min(1100px,calc(100% - 48px));margin:0 auto 38px}
.hub-card-v2{display:block;padding:22px;text-decoration:none;color:var(--i4-text);border:1px solid var(--i4-line)}
.hub-card-v2:hover{border-color:#9cc9d5;transform:translateY(-3px)}
.hub-card-v2 h3{margin:13px 0 7px;color:var(--i4-navy);line-height:1.4}
.hub-card-v2 p{margin:0;color:var(--i4-muted);font-size:14px;line-height:1.75}
.card-icon{width:34px;height:34px;color:var(--i4-green)}
.card-icon svg{width:100%;height:100%}
.card-arrow{display:block;margin-top:14px;color:var(--i4-blue);font-size:13px}
.faq-list{margin:0}
.faq-item-v2{padding:18px 0;border-bottom:1px solid var(--i4-line)}
.faq-q{color:var(--i4-navy);font-weight:800;line-height:1.6}
.faq-a{margin-top:7px;color:var(--i4-muted);line-height:1.85}
.duba-trust-panel{width:min(1100px,calc(100% - 48px));margin:0 auto 36px;padding:26px 30px;background:#fff;border:1px solid var(--i4-line);border-radius:14px;box-shadow:0 10px 26px rgba(24,50,74,.08)}
.trust-panel-brand-row{display:flex;justify-content:space-between;gap:16px;align-items:center;color:var(--i4-muted);font-size:14px;line-height:1.6}
.trust-panel-brand-row strong{color:var(--i4-navy)}
.trust-panel-btn{display:flex;align-items:center;justify-content:center;gap:10px;min-height:58px;margin-top:20px;border-radius:9px;color:#fff!important;background:linear-gradient(135deg,var(--i4-blue),#1768d7)!important;text-decoration:none;font-size:20px;font-weight:800;box-shadow:0 10px 20px rgba(47,124,246,.2)}
.trust-panel-btn svg{width:22px;height:22px}
.trust-panel-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:24px;margin-top:16px;color:var(--i4-muted);font-size:13px}
.trust-panel-badges span{display:inline-flex;align-items:center;gap:5px}
.trust-panel-badges svg{width:16px;height:16px;color:var(--i4-green)}
.download-panel a{border-radius:9px!important}
.notice{border-left-color:var(--i4-green)!important;background:#effbf7!important;color:var(--i4-text)!important;line-height:1.85!important}
.footer.i4-footer{margin-top:54px;padding:44px 0 24px;background:var(--i4-navy-deep);color:#a9bac8}
.i4-footer .footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px}
.i4-footer .footer-col h4{margin:0 0 14px;color:#fff;font-size:15px}
.i4-footer .footer-col ul{padding:0;margin:0;list-style:none}
.i4-footer .footer-col li+li{margin-top:8px}
.i4-footer .footer-col a{color:#a9bac8;text-decoration:none;font-size:13px}
.i4-footer .footer-col a:hover{color:#fff}
.i4-footer-bottom{margin-top:34px;padding-top:18px;border-top:1px solid rgba(255,255,255,.12);font-size:12px;color:#8298a8}
.i4-footer-bottom a{color:#8298a8;text-decoration:none}
.meta-bar{display:none!important}
@media (max-width:900px){
  .i4-header-inner{gap:14px}.i4-brand{min-width:auto}.i4-brand strong{font-size:16px}.i4-brand em{display:none}
  .i4-nav-link{padding:0 9px;font-size:13px}.i4-header-cta{padding:0 12px;font-size:13px}
  .i4-hero-grid{grid-template-columns:minmax(0,1fr) 40%;gap:28px}
  .i4-hero{padding:55px 0}.i4-hero h1{font-size:36px}.i4-hero .hero-sub{font-size:15px}
}
@media (max-width:640px){
  .container,.i4-header-inner{width:min(100% - 28px,1200px)}
  .i4-header{height:auto!important}.i4-header-inner{height:auto;min-height:68px;flex-wrap:wrap;padding:10px 0}
  .i4-nav{order:3;width:100%;height:42px;overflow:auto;flex-basis:100%}.i4-nav-link{padding:0 11px}
  .i4-hero{padding:40px 0 46px}.i4-hero-grid{grid-template-columns:1fr;gap:28px;min-height:0}
  .i4-hero h1{font-size:32px}.i4-hero .hero-sub{font-size:15px}
  .i4-hero-visual{order:2}.i4-hero-img{max-width:340px}
  .entity-card,.hub-grid-v2{width:calc(100% - 28px)}.hub-grid-v2{grid-template-columns:1fr}
  .faq-v2{width:calc(100% - 28px);margin:28px auto;padding:18px}
  .duba-trust-panel{width:calc(100% - 28px);padding:20px 16px}.trust-panel-brand-row{align-items:flex-start;flex-direction:column;gap:4px}.trust-panel-btn{font-size:17px}.trust-panel-badges{justify-content:flex-start;gap:10px 16px}
  .content-layout{grid-template-columns:1fr}.sidebar{position:static;order:2}
  .i4-footer .footer-grid{grid-template-columns:repeat(2,1fr);gap:24px}
}