:root{
      --theme:#0B3D91;
      --ink:#17233c;
      --muted:#63708a;
      --line:#e4e9f2;
      --paper:#f6f8fc;
      --white:#fff;
      --accent:#f2b84b;
      --shadow:0 18px 48px rgba(20,45,90,.10);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:var(--paper);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}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .topbar{background:#10274f;color:#dbe6fa;font-size:13px}
    .topbar .container{height:38px;display:flex;align-items:center;justify-content:space-between}
    .topbar-links{display:flex;gap:22px}
    .topbar a:hover{color:#fff}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:78px;display:flex;align-items:center;gap:30px}
    .logo{display:flex;align-items:center;gap:10px;min-width:180px;color:var(--theme);font-size:20px;font-weight:800}
    .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;padding:0;margin:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:block;padding:27px 13px;color:#263552;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"⌄";font-size:12px;margin-left:6px;color:#8995a9}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% + 1px);left:50%;transform:translate(-50%,8px);width:320px;padding:22px;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:hover .dropdown-panel,.nav-item:hover .mega-menu,.nav-item:focus-within .dropdown-panel,.nav-item:focus-within .mega-menu{opacity:1;visibility:visible;transform:translate(-50%,0)}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .drop-title,.mega-title{margin:0 0 13px;color:var(--theme);font-size:16px;font-weight:800}
    .drop-list,.mega-links{display:grid;gap:8px}
    .drop-list a,.mega-links a{display:block;padding:7px 9px;border-radius:7px;color:#52617a;font-size:13px}
    .drop-list a:hover,.mega-links a:hover{background:#f0f5ff;color:var(--theme)}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
    .mega-card{display:flex;gap:10px;align-items:center;padding:10px;border:1px solid var(--line);border-radius:10px}
    .mega-card:hover{border-color:#9cb4df;background:#f7faff}
    .mega-card img{width:34px;height:34px;object-fit:contain;border-radius:7px}
    .mega-card span{min-width:0}
    .mega-card strong,.mega-card small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .mega-card strong{font-size:13px}.mega-card small{color:var(--muted);font-size:11px}
    .mega-columns{display:grid;grid-template-columns:1fr 1fr;gap:25px}
    .mega-footer{display:block;margin-top:16px;padding-top:13px;border-top:1px solid var(--line);color:var(--theme);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:13px;white-space:nowrap}
    .member-btn{padding:8px 13px;border-radius:7px;background:var(--theme);color:#fff;font-size:13px}
    .account-link{color:var(--theme);font-size:14px;font-weight:700}
    .hamburger{display:none;width:38px;height:38px;border:1px solid var(--line);border-radius:8px;background:#fff;cursor:pointer;padding:8px}
    .hamburger span{display:block;height:2px;margin:4px 0;background:var(--theme);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{display:none;position:fixed;inset:0;background:rgba(9,25,54,.45);z-index:40}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;top:0;right:-390px;width:min(370px,88vw);height:100vh;overflow:auto;background:#fff;z-index:50;transition:right .25s;padding-bottom:30px}
    .mobile-drawer.open{right:0}
    .drawer-head{height:68px;display:flex;align-items:center;gap:18px;padding:0 20px;border-bottom:1px solid var(--line)}
    .drawer-head strong{flex:1;color:var(--theme)}
    .drawer-head a{color:var(--theme);font-weight:700}
    .drawer-close{border:0;background:none;font-size:28px;color:#65738a;cursor:pointer}
    .drawer-menu{padding:10px 20px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 4px;border:0;border-bottom:1px solid #edf0f5;background:none;text-align:left;color:var(--ink);font:inherit;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme)}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:5px 12px;background:#f7f9fd}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 4px;color:var(--muted);font-size:14px}
    .footer{margin-top:70px;padding:48px 0 20px;background:#101f3d;color:#cad5e8}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.1fr;gap:35px}
    .footer h3{margin:0 0 15px;color:#fff;font-size:16px}
    .footer-brand strong{font-size:22px;color:#fff}
    .footer p{margin:8px 0;color:#9eacc4;font-size:13px}
    .footer-grid>div:not(.footer-brand) a{display:block;margin:8px 0;color:#b9c6db;font-size:13px}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:35px;padding-top:18px;border-top:1px solid rgba(255,255,255,.13);color:#8f9db6;font-size:12px}
    .download-page-main{padding:0 0 20px}
    .download-hero{padding:72px 0 52px;text-align:center;background:linear-gradient(135deg,#eef4ff,#fff 58%,#f5f8ff)}
    .eyebrow{display:inline-block;padding:5px 13px;border-radius:30px;background:#e5efff;color:var(--theme);font-size:13px;font-weight:700}
    .download-hero h1{margin:16px auto 12px;font-size:clamp(32px,5vw,54px);line-height:1.2;letter-spacing:-1px;color:#15294f}
    .download-hero p{max-width:650px;margin:0 auto;color:var(--muted);font-size:16px}
    .download-actions{display:flex;justify-content:center;gap:14px;margin-top:28px;flex-wrap:wrap}
    .primary-btn,.secondary-btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 24px;border-radius:8px;font-size:14px;font-weight:700}
    .primary-btn{background:var(--theme);color:#fff;box-shadow:0 8px 18px rgba(11,61,145,.22)}
    .secondary-btn{border:1px solid #b8c7df;background:#fff;color:var(--theme)}
    .download-wrap{padding:52px 0}
    .section-heading{text-align:center;margin-bottom:30px}
    .section-heading h2{margin:0 0 8px;font-size:30px;color:#1b3159}
    .section-heading p{margin:0;color:var(--muted)}
    .download-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
    .step-card{position:relative;padding:28px 24px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 10px 28px rgba(24,52,95,.06)}
    .step-number{display:flex;align-items:center;justify-content:center;width:42px;height:42px;border-radius:50%;background:#e7effc;color:var(--theme);font-weight:800;font-size:18px}
    .step-card h3{margin:18px 0 7px;font-size:19px}
    .step-card p{margin:0;color:var(--muted);font-size:14px}
    .download-panel{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:center;margin-top:58px;padding:35px;border-radius:18px;background:#142d59;color:#fff}
    .download-panel h2{margin:0 0 10px;font-size:27px}
    .download-panel p{margin:0;color:#cbd8ed;font-size:14px}
    .download-panel .primary-btn{margin-top:22px;background:var(--accent);color:#26344d;box-shadow:none}
    .platform-list{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    .platform-item{padding:18px;border:1px solid rgba(255,255,255,.18);border-radius:10px;background:rgba(255,255,255,.06)}
    .platform-item strong{display:block;margin-bottom:4px}.platform-item span{color:#c5d2e7;font-size:12px}
    .download-faq{max-width:850px;margin:60px auto 0}
    .faq-item{padding:18px 0;border-bottom:1px solid var(--line)}
    .faq-item h3{margin:0 0 6px;font-size:16px;color:#243b65}
    .faq-item p{margin:0;color:var(--muted);font-size:14px}
    @media(max-width:980px){
      .main-nav{display:none}.hamburger{display:block}.header-inner{height:68px}.header-btns{margin-left:auto}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media(max-width:700px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{height:auto;min-height:38px;padding:7px 0;align-items:flex-start;gap:4px;flex-direction:column}
      .topbar-links{gap:12px;flex-wrap:wrap}
      .logo{min-width:0;font-size:17px}.logo img{width:32px;height:32px}
      .member-btn,.account-link{display:none}
      .download-hero{padding:52px 0 42px}.download-hero h1{font-size:35px}
      .download-steps,.download-panel{grid-template-columns:1fr}.download-panel{padding:25px}
      .platform-list{grid-template-columns:1fr}
      .footer-grid{grid-template-columns:1fr 1fr;gap:24px 18px}
      .footer-bottom{display:block}.footer-bottom span{display:block;margin-top:8px}
    }
    @media(max-width:430px){.footer-grid{grid-template-columns:1fr}.download-actions a{width:100%}}