:root{
      --primary:#0B3D91;
      --primary-dark:#082d6b;
      --ink:#14213d;
      --muted:#667085;
      --line:#e6eaf0;
      --soft:#f5f8fc;
      --white:#fff;
      --shadow:0 18px 55px rgba(20,33,61,.1);
      --radius:18px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#fff;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","微软雅黑",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:#0d1b34;color:#dce6f8;font-size:13px}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar a{color:#dce6f8;margin-left:22px}
    .topbar a:hover{color:#fff}

    .header{position:relative;z-index:30;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{min-height:78px;display:flex;align-items:center;gap:28px}
    .logo{display:flex;align-items:center;gap:10px;min-width:max-content;font-weight:800;color:var(--primary);font-size:19px}
    .logo img{width:34px;height:34px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;justify-content:center;align-items:stretch;gap:3px;padding:0;margin:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;min-height:78px;padding:0 14px;font-size:15px;color:#27364f;white-space:nowrap}
    .nav-link:hover,.nav-link:focus-visible{color:var(--primary)}
    .has-arrow:after{content:"";width:6px;height:6px;margin-left:8px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg) translateY(-2px)}
    .dropdown-panel,.mega-menu{position:absolute;left:50%;top:calc(100% + 1px);transform:translateX(-50%) translateY(8px);width:300px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:0 0 16px 16px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s ease}
    .mega-menu{width:590px}
    .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;transform:translateX(-50%) translateY(0)}
    .drop-title,.mega-title{font-weight:800;color:var(--primary);margin-bottom:12px}
    .drop-list{display:grid;gap:8px}
    .drop-list a{display:block;padding:7px 8px;border-radius:8px;font-size:14px}
    .drop-list a:hover{background:var(--soft);color:var(--primary)}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
    .mega-card{display:block;padding:12px;border:1px solid var(--line);border-radius:12px;min-height:92px;background:#fff}
    .mega-card:hover{border-color:#9db7e6;background:#f7faff}
    .mega-card img{width:28px;height:28px;object-fit:contain;margin-bottom:6px}
    .mega-card strong,.mega-card small{display:block}
    .mega-card strong{font-size:13px;line-height:1.4}
    .mega-card small{font-size:11px;color:var(--muted);line-height:1.5;margin-top:3px}
    .mega-footer{display:block;text-align:center;color:var(--primary);font-size:13px;font-weight:700;border-top:1px solid var(--line);margin-top:16px;padding-top:13px}
    .header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}
    .member-btn{font-size:13px;color:var(--primary)}
    .open-btn{padding:9px 15px;border-radius:9px;background:var(--primary);color:#fff;font-size:13px;font-weight:700}
    .open-btn:hover{background:var(--primary-dark)}
    .hamburger{display:none;width:42px;height:40px;border:1px solid var(--line);border-radius:9px;background:#fff;padding:9px;cursor:pointer}
    .hamburger span{display:block;height:2px;background:var(--primary);margin:5px 0;transition:.2s}
    .hamburger.active span:first-child{transform:translateY(7px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:last-child{transform:translateY(-7px) rotate(-45deg)}

    .drawer-overlay{position:fixed;inset:0;background:rgba(5,19,43,.48);z-index:60;opacity:0;visibility:hidden;transition:.25s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;right:0;top:0;bottom:0;width:min(390px,88vw);background:#fff;z-index:70;transform:translateX(105%);transition:.3s;overflow:auto;box-shadow:-16px 0 40px rgba(0,0,0,.16)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:16px;padding:20px;border-bottom:1px solid var(--line);color:var(--primary);font-weight:800}
    .drawer-head a{margin-left:auto;color:var(--primary);font-size:14px}
    .drawer-close{border:0;background:transparent;font-size:28px;color:#556070;cursor:pointer;line-height:1}
    .drawer-menu{padding:10px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid var(--line);background:transparent;text-align:left;color:var(--ink);font-weight:700;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--primary);font-size:20px;font-weight:400}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:6px 0 8px 14px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:14px}

    .download-page-main{background:linear-gradient(180deg,#f6f9fd 0,#fff 54%);padding-bottom:90px}
    .download-hero{padding:82px 0 55px;text-align:center}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border-radius:30px;background:#e7eefb;color:var(--primary);font-size:13px;font-weight:800}
    .eyebrow:before{content:"";width:7px;height:7px;border-radius:50%;background:#2c76e8}
    .download-hero h1{font-size:clamp(32px,5vw,58px);line-height:1.15;margin:20px 0 14px;letter-spacing:-1px}
    .download-hero p{max-width:680px;margin:0 auto;color:var(--muted);font-size:17px}
    .download-actions{display:flex;justify-content:center;gap:12px;margin-top:28px;flex-wrap:wrap}
    .primary-action,.secondary-action{display:inline-flex;align-items:center;justify-content:center;min-width:150px;padding:12px 21px;border-radius:10px;font-weight:800}
    .primary-action{background:var(--primary);color:#fff}
    .secondary-action{border:1px solid #cbd7e9;color:var(--primary);background:#fff}
    .primary-action:hover{background:var(--primary-dark)}
    .secondary-action:hover{border-color:var(--primary);background:#f4f8ff}

    .download-shell{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:stretch}
    .download-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:0 10px 35px rgba(21,47,87,.06)}
    .download-card h2{margin:0 0 8px;font-size:23px}
    .download-card>p{margin:0 0 22px;color:var(--muted)}
    .platform-list{display:grid;gap:12px}
    .platform-item{display:flex;align-items:center;gap:15px;padding:16px;border:1px solid var(--line);border-radius:13px;transition:.2s}
    .platform-item:hover{border-color:#9ab6e5;background:#f7faff;transform:translateY(-2px)}
    .platform-icon{width:42px;height:42px;border-radius:11px;background:#e8f0ff;color:var(--primary);display:grid;place-items:center;font-weight:900}
    .platform-item strong{display:block;font-size:16px}
    .platform-item small{display:block;color:var(--muted);font-size:12px}
    .platform-item .download-link{margin-left:auto;color:var(--primary);font-size:13px;font-weight:800}
    .feature-panel{background:linear-gradient(145deg,#0b3d91,#102b61);color:#fff;position:relative;overflow:hidden}
    .feature-panel:after{content:"";position:absolute;width:250px;height:250px;right:-80px;top:-80px;border:1px solid rgba(255,255,255,.2);border-radius:50%;box-shadow:0 0 0 26px rgba(255,255,255,.04),0 0 0 52px rgba(255,255,255,.03)}
    .feature-panel h2{position:relative;z-index:1}
    .feature-panel>p{color:#d6e2f7;position:relative;z-index:1}
    .feature-points{position:relative;z-index:1;display:grid;gap:15px;margin-top:25px}
    .feature-point{display:flex;gap:13px;align-items:flex-start}
    .check{width:23px;height:23px;display:grid;place-items:center;flex:none;border-radius:50%;background:#8fbbff;color:#092d6e;font-weight:900;font-size:13px}
    .feature-point strong{display:block;font-size:15px}
    .feature-point span{display:block;color:#cbd9ed;font-size:13px;margin-top:2px}
    .steps-section{padding-top:78px}
    .section-heading{text-align:center;margin-bottom:28px}
    .section-heading h2{margin:0 0 7px;font-size:30px}
    .section-heading p{margin:0;color:var(--muted)}
    .steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .step-card{position:relative;background:#fff;border:1px solid var(--line);border-radius:16px;padding:25px}
    .step-number{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:var(--primary);color:#fff;font-weight:800;margin-bottom:15px}
    .step-card h3{margin:0 0 8px;font-size:18px}
    .step-card p{margin:0;color:var(--muted);font-size:14px}
    .faq-section{padding-top:78px;max-width:900px;margin:0 auto}
    .faq-list{display:grid;gap:10px}
    .faq-item{border:1px solid var(--line);border-radius:12px;padding:17px 20px;background:#fff}
    .faq-item summary{cursor:pointer;font-weight:800;color:var(--ink)}
    .faq-item p{color:var(--muted);font-size:14px;margin:12px 0 0}

    .footer{background:#0d1b34;color:#c7d3e7;padding:58px 0 22px}
    .footer-grid{display:grid;grid-template-columns:1.45fr 1fr 1fr 1.1fr;gap:35px}
    .footer h3{font-size:15px;color:#fff;margin:0 0 14px}
    .footer-brand strong{font-size:21px;color:#fff}
    .footer p{font-size:13px;color:#aebdd3;margin:10px 0}
    .footer-grid>div:not(.footer-brand) a,.footer-grid>div:not(.footer-brand)>span{display:block;font-size:13px;color:#b9c7da;margin:7px 0}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid rgba(255,255,255,.14);margin-top:38px;padding-top:18px;color:#91a4be;font-size:12px}

    @media (max-width:980px){
      .main-nav{display:none}
      .hamburger{display:block}
      .download-shell{grid-template-columns:1fr}
      .header-btns{margin-left:auto}
      .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:0 16px 0 0}
      .header-inner{min-height:68px;gap:10px}
      .member-btn{display:none}
      .open-btn{padding:8px 11px;font-size:12px}
      .download-hero{padding:55px 0 35px}
      .download-hero p{font-size:15px}
      .download-card{padding:21px}
      .steps-grid{grid-template-columns:1fr}
      .steps-section,.faq-section{padding-top:52px}
      .section-heading h2{font-size:26px}
      .footer-grid{grid-template-columns:1fr;gap:25px}
      .footer-bottom{display:block}
      .footer-bottom span{display:block;margin-top:8px}
    }