:root{
      --theme:#0B3D91;
      --ink:#111827;
      --muted:#64748b;
      --line:#dbe3ee;
      --soft:#f4f7fb;
      --white:#fff;
      --max:1240px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#fff;font-family:Arial,"Microsoft YaHei","PingFang 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:auto}

    .topbar{background:#0d1728;color:#dbe5f3;font-size:13px}
    .topbar-inner{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-info{display:flex;gap:22px}
    .topbar a:hover{color:#fff}

    .header{position:relative;z-index:30;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:76px;display:flex;align-items:center;gap:30px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;font-size:19px;font-weight:800;letter-spacing:.02em}
    .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;list-style:none;margin:0;padding:0}
    .nav-item{position:relative}
    .nav-link{display:block;padding:27px 15px;font-size:14px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .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:translate(-50%,8px);width:310px;opacity:0;visibility:hidden;pointer-events:none;background:#fff;border:1px solid var(--line);box-shadow:0 18px 45px rgba(15,35,65,.15);padding:20px;border-radius:0 0 12px 12px;transition:.2s}
    .mega-menu{width:560px}
    .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;pointer-events:auto;transform:translate(-50%,0)}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .dropdown-panel>a:not(.mega-footer){display:block;padding:9px 4px;border-bottom:1px solid #eef2f7;font-size:14px}
    .mega-heading{font-size:15px;margin:0 0 14px;color:var(--theme)}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:9px;max-height:390px;overflow:auto}
    .mega-card{display:flex;flex-direction:column;gap:3px;padding:11px;border:1px solid #e6ebf2;border-radius:8px;background:#fbfdff}
    .mega-card:hover{border-color:var(--theme);background:#f2f6fc}
    .mega-card img{width:24px;height:24px;object-fit:contain;margin-bottom:3px}
    .mega-card strong{font-size:13px}
    .mega-card small{font-size:11px;color:var(--muted);line-height:1.45}
    .mega-footer{display:block;margin-top:14px;padding-top:12px;border-top:1px solid var(--line);color:var(--theme);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:12px;white-space:nowrap}
    .member-link{font-size:13px;color:var(--theme)}
    .open-link{padding:9px 15px;color:#fff;background:var(--theme);border-radius:4px;font-size:13px}
    .hamburger{display:none;border:0;background:none;padding:8px;cursor:pointer}
    .hamburger span{display:block;width:23px;height:2px;background:var(--ink);margin:5px 0;transition:.2s}

    .mobile-drawer{position:fixed;z-index:80;right:0;top:0;width:min(390px,88vw);height:100vh;overflow:auto;background:#fff;transform:translateX(100%);transition:.3s;box-shadow:-15px 0 40px rgba(0,0,0,.15)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-overlay{position:fixed;z-index:70;inset:0;background:rgba(4,14,28,.5);opacity:0;visibility:hidden;transition:.3s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .drawer-head{display:flex;align-items:center;gap:16px;padding:20px;border-bottom:1px solid var(--line);font-weight:700}
    .drawer-head>a{margin-left:auto;color:var(--theme);font-size:13px}
    .drawer-close{border:0;background:none;font-size:28px;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:none;text-align:left;font-size:15px;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--muted);font-size:20px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:4px 0 8px 15px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:13px}

    .download-page-main{background:linear-gradient(180deg,#f7faff 0,#fff 45%);padding-bottom:80px}
    .download-hero{padding:88px 0 64px;text-align:center;border-bottom:1px solid #e8eef6}
    .download-kicker{display:inline-flex;align-items:center;gap:8px;margin:0 0 18px;color:var(--theme);font-size:13px;font-weight:700;letter-spacing:.12em}
    .download-kicker:before{content:"";width:28px;height:2px;background:var(--theme)}
    .download-page-main h1{margin:0;font-size:clamp(36px,6vw,76px);line-height:1.08;letter-spacing:-.05em}
    .download-lead{max-width:680px;margin:22px auto 0;color:var(--muted);font-size:17px}
    .download-actions{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin-top:30px}
    .primary-button,.secondary-button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 22px;border-radius:4px;font-size:14px;font-weight:700}
    .primary-button{background:var(--theme);color:#fff}
    .secondary-button{border:1px solid #b8c6d9;color:var(--theme);background:#fff}
    .primary-button:hover{background:#082e70}
    .download-section{padding:70px 0 0}
    .section-heading{text-align:center;margin-bottom:34px}
    .section-heading h2{margin:0;font-size:30px;letter-spacing:-.03em}
    .section-heading p{margin:10px auto 0;color:var(--muted);max-width:650px}
    .download-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .step-card{position:relative;padding:28px;background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:0 12px 30px rgba(24,53,92,.06)}
    .step-number{display:flex;width:38px;height:38px;align-items:center;justify-content:center;border-radius:50%;background:#e8f0fc;color:var(--theme);font-weight:800;margin-bottom:19px}
    .step-card h3{margin:0 0 8px;font-size:18px}
    .step-card p{margin:0;color:var(--muted);font-size:14px}
    .download-panel{display:grid;grid-template-columns:1.2fr .8fr;gap:30px;align-items:stretch}
    .download-box{padding:34px;background:#0d1728;color:#fff;border-radius:12px;overflow:hidden;position:relative}
    .download-box:after{content:"";position:absolute;width:220px;height:220px;border:1px solid rgba(255,255,255,.13);border-radius:50%;right:-70px;bottom:-90px}
    .download-box h3{font-size:25px;margin:0 0 10px}
    .download-box p{color:#b9c7d9;margin:0 0 24px;max-width:550px}
    .download-box .primary-button{background:#fff;color:var(--theme)}
    .feature-list{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:0;padding:0;list-style:none}
    .feature-list li{padding:17px 16px;background:#f5f8fc;border:1px solid #e2eaf4;border-radius:8px;font-size:14px}
    .feature-list li:before{content:"✓";color:var(--theme);font-weight:800;margin-right:8px}
    .faq-list{max-width:840px;margin:auto;border-top:1px solid var(--line)}
    .faq-item{padding:20px 0;border-bottom:1px solid var(--line)}
    .faq-item h3{font-size:16px;margin:0 0 6px}
    .faq-item p{font-size:14px;color:var(--muted);margin:0}
    .notice{margin-top:28px;padding:16px 18px;background:#eef4fc;border-left:3px solid var(--theme);color:#40536e;font-size:13px}

    .footer{background:#0d1728;color:#c2cedd;padding:55px 0 22px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.1fr;gap:35px}
    .footer-brand{color:#fff;font-size:20px;font-weight:800;margin-bottom:14px}
    .footer p{margin:7px 0;font-size:13px;line-height:1.75}
    .footer h3{color:#fff;font-size:14px;margin:0 0 14px}
    .footer-grid>div>a{display:block;font-size:13px;margin:8px 0;color:#c2cedd}
    .footer-grid>div>a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:38px;padding-top:18px;border-top:1px solid rgba(255,255,255,.13);font-size:12px;color:#91a0b4}

    @media(max-width:1050px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-inner{justify-content:space-between}
      .download-panel{grid-template-columns:1fr}
    }
    @media(max-width:700px){
      .container{width:min(100% - 28px,var(--max))}
      .topbar-inner{padding:8px 0;align-items:flex-start;flex-direction:column;gap:2px}
      .topbar-info{gap:12px;flex-wrap:wrap}
      .header-inner{height:66px}
      .logo{min-width:0;font-size:16px}
      .logo img{width:30px;height:30px}
      .member-link,.open-link{display:none}
      .download-hero{padding:60px 0 48px}
      .download-lead{font-size:15px}
      .download-steps{grid-template-columns:1fr}
      .download-section{padding-top:52px}
      .download-box{padding:25px}
      .feature-list{grid-template-columns:1fr}
      .footer-grid{grid-template-columns:1fr 1fr;gap:28px 20px}
      .footer-grid>div:first-child{grid-column:1/-1}
      .footer-bottom{flex-direction:column;gap:5px}
    }