:root{
      --theme:#0B3D91;
      --ink:#172033;
      --muted:#64748b;
      --line:#dbe3ee;
      --soft:#f4f7fb;
      --white:#fff;
      --accent:#f2b544;
      --max:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#fff;font-family:Arial,"Microsoft YaHei","Noto Sans SC",sans-serif;line-height:1.6}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block}
    button{font:inherit}
    .container{width:min(var(--max),calc(100% - 40px));margin:0 auto}
    .topbar{background:#102341;color:#dbe7f7;font-size:13px}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar a{margin-left:18px;color:#fff}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{min-height:78px;display:flex;align-items:center;gap:30px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;font-weight:800;color:var(--theme)}
    .logo img{width:36px;height:36px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:center;justify-content:center;gap:4px;margin:0;padding:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:5px;padding:27px 13px;font-size:14px;font-weight:700;white-space:nowrap}
    .has-arrow:after{content:"";width:6px;height:6px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg) translateY(-2px)}
    .nav-link:hover,.nav-link:focus-visible{color:var(--theme)}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% - 1px);left:50%;transform:translateX(-50%) translateY(8px);width:270px;padding:18px;background:#fff;border:1px solid var(--line);box-shadow:0 18px 45px rgba(22,43,75,.14);opacity:0;visibility:hidden;transition:.2s ease;pointer-events:none}
    .mega-menu{width:min(760px,calc(100vw - 40px))}
    .nav-item:hover .dropdown-panel,.nav-item:focus-within .dropdown-panel,.nav-item:hover .mega-menu,.nav-item:focus-within .mega-menu{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0);pointer-events:auto}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .dropdown-panel a{display:block;padding:8px 4px;border-bottom:1px solid #eef2f7;font-size:13px}
    .dropdown-panel a:last-child{color:var(--theme);font-weight:700;border:0}
    .mega-title{margin-bottom:10px;color:var(--theme);font-size:13px;font-weight:800}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:9px;margin-bottom:14px}
    .mega-card{display:block;min-height:96px;padding:10px;border:1px solid #e5ebf2;background:#fbfcfe}
    .mega-card:hover{border-color:var(--theme);background:#f3f7ff}
    .mega-card img{width:30px;height:30px;object-fit:contain;margin-bottom:7px}
    .mega-card strong,.mega-card small{display:block;overflow:hidden}
    .mega-card strong{font-size:12px;white-space:nowrap;text-overflow:ellipsis}
    .mega-card small{margin-top:3px;color:var(--muted);font-size:11px;line-height:1.45}
    .mega-footer{display:block;padding-top:11px;border-top:1px solid var(--line);color:var(--theme);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:9px}
    .member-btn,.open-btn{padding:9px 13px;font-size:13px;font-weight:700;white-space:nowrap}
    .member-btn{color:var(--theme)}
    .open-btn{background:var(--theme);color:#fff}
    .hamburger{display:none;width:42px;height:40px;padding:9px;border:1px solid var(--line);background:#fff;cursor:pointer}
    .hamburger span{display:block;width:21px;height:2px;margin:4px auto;background:var(--ink);transition:.2s}
    .hamburger.active span:nth-child(1){transform:translateY(6px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
    .drawer-overlay{position:fixed;inset:0;z-index:40;background:rgba(10,25,48,.45);opacity:0;visibility:hidden;transition:.2s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:0;bottom:0;z-index:50;width:min(380px,88vw);background:#fff;transform:translateX(100%);transition:.25s ease;overflow:auto}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:15px;padding:19px;border-bottom:1px solid var(--line);font-weight:800;color:var(--theme)}
    .drawer-head>a{margin-left:auto;padding:7px 10px;background:var(--theme);color:#fff;font-size:13px}
    .drawer-close{width:32px;height:32px;border:1px solid var(--line);background:#fff;color:var(--ink);font-size:22px;line-height:1;cursor:pointer}
    .drawer-menu{padding:10px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid #edf1f6;background:#fff;text-align:left;color:var(--ink);font-weight:700;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:19px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:4px 0 8px 14px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:9px 0;color:var(--muted);font-size:14px}
    .download-page-main{background:#f6f8fc}
    .download-hero{padding:78px 0 66px;background:linear-gradient(135deg,#edf4ff 0%,#fff 62%);border-bottom:1px solid var(--line)}
    .download-kicker{display:inline-flex;align-items:center;gap:8px;color:var(--theme);font-size:13px;font-weight:800;letter-spacing:1px}
    .download-kicker:before{content:"";width:24px;height:3px;background:var(--accent)}
    .download-hero h1{max-width:760px;margin:17px 0 15px;font-size:clamp(34px,5vw,62px);line-height:1.1;letter-spacing:0}
    .download-hero p{max-width:680px;margin:0;color:var(--muted);font-size:18px}
    .download-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
    .primary-action,.secondary-action{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 20px;border:1px solid var(--theme);font-weight:800}
    .primary-action{background:var(--theme);color:#fff}
    .secondary-action{color:var(--theme);background:#fff}
    .download-content{padding:64px 0 80px}
    .section-heading{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:25px}
    .section-heading h2{margin:0;font-size:30px;line-height:1.2}
    .section-heading p{max-width:560px;margin:0;color:var(--muted)}
    .download-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:65px}
    .step-card{position:relative;min-height:205px;padding:25px;background:#fff;border:1px solid var(--line)}
    .step-number{display:flex;align-items:center;justify-content:center;width:38px;height:38px;margin-bottom:19px;background:#e9f0fc;color:var(--theme);font-weight:900}
    .step-card h3{margin:0 0 8px;font-size:19px}
    .step-card p{margin:0;color:var(--muted);font-size:14px}
    .step-card a{display:inline-block;margin-top:18px;color:var(--theme);font-size:14px;font-weight:800}
    .download-panels{display:grid;grid-template-columns:1.1fr .9fr;gap:20px;align-items:start}
    .download-panel{padding:28px;background:#fff;border:1px solid var(--line)}
    .download-panel h2{margin:0 0 18px;font-size:23px}
    .platform-list{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    .platform-item{display:flex;align-items:center;gap:13px;padding:15px;background:var(--soft);border:1px solid #e4ebf4}
    .platform-icon{display:grid;place-items:center;width:35px;height:35px;background:var(--theme);color:#fff;font-weight:800}
    .platform-item strong{display:block;font-size:14px}
    .platform-item span{display:block;color:var(--muted);font-size:12px}
    .faq-item{padding:15px 0;border-bottom:1px solid var(--line)}
    .faq-item:last-child{border-bottom:0}
    .faq-item h3{margin:0 0 5px;font-size:15px}
    .faq-item p{margin:0;color:var(--muted);font-size:13px}
    .footer{background:#102341;color:#d9e4f3;padding:48px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:35px}
    .footer strong{display:block;color:#fff;font-size:19px;margin-bottom:12px}
    .footer h3{margin:0 0 13px;color:#fff;font-size:14px}
    .footer p{margin:7px 0;color:#a9bdd7;font-size:13px}
    .footer a{display:block;margin:8px 0;color:#a9bdd7;font-size:13px}
    .footer a:hover{color:#fff}
    .footer-bottom{margin-top:35px;padding-top:18px;border-top:1px solid rgba(255,255,255,.16);color:#91a7c1;font-size:12px}
    @media (max-width:980px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-btns{margin-left:auto}
      .mega-grid{grid-template-columns:repeat(2,1fr)}
      .download-panels{grid-template-columns:1fr}
    }
    @media (max-width:700px){
      .container{width:min(var(--max),calc(100% - 28px))}
      .topbar .container{align-items:flex-start;flex-direction:column;gap:2px;padding:8px 0}
      .topbar a{margin-left:0;margin-right:14px}
      .header-inner{min-height:68px;gap:10px}
      .logo{min-width:0;font-size:14px}
      .logo img{width:30px;height:30px}
      .member-btn,.open-btn{display:none}
      .download-hero{padding:52px 0 48px}
      .download-hero p{font-size:16px}
      .download-content{padding:45px 0 60px}
      .download-steps{grid-template-columns:1fr;margin-bottom:45px}
      .section-heading{display:block}
      .section-heading h2{margin-bottom:10px;font-size:26px}
      .platform-list{grid-template-columns:1fr}
      .footer-grid{grid-template-columns:1fr 1fr;gap:28px 18px}
    }
    @media (max-width:440px){
      .footer-grid{grid-template-columns:1fr}
      .download-actions{display:grid}
      .primary-action,.secondary-action{width:100%}
    }