:root{
      --blue:#0B3D91;
      --ink:#17263b;
      --muted:#65748a;
      --line:#dce4ee;
      --soft:#f4f7fb;
      --white:#fff;
      --shadow:0 16px 42px rgba(20,47,86,.10);
      --radius:16px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f7f9fc;font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.7}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block}
    button{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .topbar{background:#10213b;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:20px;color:#fff}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{min-height:76px;display:flex;align-items:center;gap:28px}
    .logo{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:800;color:var(--blue);white-space:nowrap}
    .logo img{width:38px;height:38px;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:block;padding:25px 13px;color:#26364d;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--blue)}
    .has-arrow:after{content:"";display:inline-block;width:6px;height:6px;margin:0 0 3px 8px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg)}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%);width:310px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s;z-index:30}
    .mega-menu{width:610px}
    .nav-item:after{content:"";position:absolute;left:0;right:0;top:100%;height:12px}
    .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}
    .drop-title,.mega-title{margin:0 0 12px;font-size:14px;font-weight:800;color:var(--blue)}
    .drop-link{display:block;padding:8px 0;border-bottom:1px solid #edf1f6;font-size:14px}
    .drop-link:hover{color:var(--blue)}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
    .mega-card{display:flex;gap:10px;padding:10px;border:1px solid #e7edf5;border-radius:10px;background:#fbfcfe}
    .mega-card:hover{border-color:#9db7df;background:#f4f8ff}
    .mega-card img{width:34px;height:34px;object-fit:contain;border-radius:7px}
    .mega-card strong,.mega-card small{display:block}
    .mega-card strong{font-size:13px}
    .mega-card small{font-size:11px;color:var(--muted);line-height:1.5}
    .mega-footer{display:block;margin-top:14px;padding-top:12px;border-top:1px solid var(--line);font-size:13px;color:var(--blue);font-weight:700}
    .header-btns{display:flex;align-items:center;gap:9px;white-space:nowrap}
    .member-btn,.open-btn{padding:8px 13px;border-radius:8px;font-size:13px}
    .member-btn{color:var(--blue);border:1px solid #b9cbe5}
    .open-btn{background:var(--blue);color:#fff}
    .hamburger{display:none;width:42px;height:40px;border:1px solid var(--line);border-radius:8px;background:#fff;padding:8px}
    .hamburger span{display:block;height:2px;margin:5px 0;background:var(--blue);transition:.2s}
    .hamburger.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
    .drawer-overlay{position:fixed;inset:0;background:rgba(6,20,40,.48);opacity:0;visibility:hidden;z-index:50;transition:.2s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:0;width:min(390px,88%);height:100vh;background:#fff;z-index:60;transform:translateX(100%);transition:.25s;overflow:auto}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:14px;padding:18px 20px;border-bottom:1px solid var(--line);font-weight:700}
    .drawer-head>a{margin-left:auto;color:var(--blue)}
    .drawer-close{border:0;background:none;font-size:30px;line-height:1;color:#65748a;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);cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--blue);font-size:20px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:4px 0 8px 14px;background:#f7f9fc}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:#50627b;font-size:14px}
    .download-page-main{padding:64px 0 88px}
    .download-hero{text-align:center;max-width:780px;margin:0 auto 42px}
    .eyebrow{display:inline-flex;padding:6px 13px;border-radius:30px;color:var(--blue);background:#eaf1fc;font-size:13px;font-weight:700}
    .download-hero h1{margin:16px 0 12px;font-size:clamp(30px,5vw,52px);line-height:1.2;letter-spacing:-1px}
    .download-hero p{margin:0;color:var(--muted);font-size:17px}
    .download-layout{display:grid;grid-template-columns:1.15fr .85fr;gap:26px;align-items:start}
    .download-panel,.download-side,.faq-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
    .download-panel{padding:30px}
    .section-title{margin:0 0 22px;font-size:24px}
    .steps{display:grid;gap:18px}
    .step{display:grid;grid-template-columns:48px 1fr;gap:16px;align-items:start;padding-bottom:18px;border-bottom:1px solid #edf1f6}
    .step:last-child{padding-bottom:0;border-bottom:0}
    .step-num{display:grid;place-items:center;width:42px;height:42px;border-radius:50%;background:var(--blue);color:#fff;font-weight:800}
    .step h3{margin:0 0 5px;font-size:17px}
    .step p{margin:0;color:var(--muted);font-size:14px}
    .download-side{padding:26px}
    .download-side h2{margin:0 0 12px;font-size:21px}
    .download-side p{margin:0 0 20px;color:var(--muted);font-size:14px}
    .primary-btn,.secondary-btn{display:inline-flex;justify-content:center;align-items:center;min-height:44px;padding:0 20px;border-radius:9px;font-weight:700;font-size:14px}
    .primary-btn{background:var(--blue);color:#fff}
    .secondary-btn{border:1px solid #b8c9e2;color:var(--blue);background:#fff}
    .button-stack{display:grid;gap:10px}
    .product-links{margin-top:24px;padding-top:20px;border-top:1px solid var(--line)}
    .product-links h3{margin:0 0 12px;font-size:16px}
    .product-link{display:block;padding:11px 0;border-bottom:1px solid #edf1f6}
    .product-link strong{display:block;color:var(--blue)}
    .product-link span{display:block;color:var(--muted);font-size:12px}
    .faq-panel{margin-top:26px;padding:30px}
    .faq-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .faq-item{padding:18px;border:1px solid #e5ebf3;border-radius:12px;background:#fbfcfe}
    .faq-item h3{margin:0 0 6px;font-size:16px}
    .faq-item p{margin:0;color:var(--muted);font-size:14px}
    .footer{padding:54px 0 20px;background:#10213b;color:#c7d4e6}
    .footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:30px}
    .footer h3,.footer h4{margin:0 0 15px;color:#fff}
    .footer h3{font-size:20px}
    .footer h4{font-size:15px}
    .footer p{margin:7px 0;font-size:13px}
    .footer-grid a{display:block;margin:7px 0;color:#c7d4e6;font-size:13px}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:36px;padding-top:18px;border-top:1px solid rgba(255,255,255,.14);font-size:12px;color:#91a6c1}
    @media(max-width:980px){
      .main-nav{display:none}
      .hamburger{display:block}
      .download-layout{grid-template-columns:1fr}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media(max-width:640px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{align-items:flex-start;flex-direction:column;gap:0;padding:8px 0}
      .topbar a{margin-left:0;margin-right:15px}
      .header-inner{min-height:66px;gap:10px}
      .logo{font-size:17px}
      .logo img{width:32px;height:32px}
      .member-btn,.open-btn{display:none}
      .download-page-main{padding:42px 0 60px}
      .download-panel,.download-side,.faq-panel{padding:22px}
      .faq-grid{grid-template-columns:1fr}
      .footer-grid{grid-template-columns:1fr}
      .footer-bottom{display:block}
      .footer-bottom span{display:block;margin-top:6px}
    }