:root{
      --theme:#0B3D91;
      --theme-deep:#082d6d;
      --ink:#182338;
      --muted:#68758a;
      --line:#e4e9f0;
      --soft:#f4f7fb;
      --white:#fff;
      --shadow:0 16px 42px rgba(17,39,75,.09);
      --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:1.65;
    }
    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{height:38px;background:#f3f6fa;color:#66748a;font-size:13px;border-bottom:1px solid #e8edf4}
    .topbar .container{height:100%;display:flex;align-items:center;justify-content:space-between}
    .topbar-links{display:flex;gap:22px}
    .topbar a:hover{color:var(--theme)}
    .header{
      position:relative;
      z-index:20;
      background:rgba(255,255,255,.96);
      border-bottom:1px solid var(--line);
    }
    .header-inner{min-height:78px;display:flex;align-items:center;gap:38px}
    .logo{display:flex;align-items:center;gap:10px;white-space:nowrap;font-size:20px;font-weight:800;color:var(--theme)}
    .logo img{width:34px;height:34px;object-fit:contain}
    .main-nav{margin-left:auto}
    .nav-list{display:flex;align-items:center;gap:4px;margin:0;padding:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:block;padding:27px 14px;font-size:14px;font-weight:600;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"⌄";font-size:12px;margin-left:6px;color:#8290a5}
    .dropdown-panel,.mega-menu{
      position:absolute;
      top:calc(100% - 1px);
      left:50%;
      transform:translateX(-50%) translateY(8px);
      width:260px;
      padding:18px;
      background:#fff;
      border:1px solid var(--line);
      border-radius:0 0 14px 14px;
      box-shadow:var(--shadow);
      opacity:0;
      visibility:hidden;
      pointer-events:none;
      transition:.2s ease;
    }
    .mega-menu{width:570px}
    .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:translateX(-50%) translateY(0)
    }
    .dropdown-panel a{display:block;padding:9px 8px;border-bottom:1px solid #eef1f5;font-size:13px}
    .dropdown-panel a:last-child{border:0;color:var(--theme);font-weight:700}
    .mega-title{margin:0 0 12px;font-size:13px;font-weight:800;color:var(--theme)}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:9px}
    .mega-card{display:block;min-height:62px;padding:11px 12px;background:#f6f8fb;border:1px solid #e8edf3;border-radius:10px;font-size:12px;transition:.2s}
    .mega-card:hover{background:#edf4ff;border-color:#b9cce9;transform:translateY(-2px)}
    .mega-card strong{font-size:13px}
    .mega-card span{color:var(--muted)}
    .mega-card img{width:24px;height:24px;object-fit:contain;margin-bottom:4px}
    .mega-footer{display:block;margin-top:14px;padding-top:12px;border-top:1px solid var(--line);font-size:13px;color:var(--theme);font-weight:700}
    .header-btns{display:flex;align-items:center;gap:10px}
    .member-btn,.account-btn{padding:9px 14px;border-radius:8px;font-size:13px;font-weight:700}
    .member-btn{color:var(--theme);background:#edf3fc}
    .account-btn{color:#fff;background:var(--theme)}
    .hamburger{display:none;width:42px;height:40px;padding:8px;border:1px solid var(--line);background:#fff;border-radius:8px;cursor:pointer}
    .hamburger span{display:block;width:22px;height:2px;margin:5px auto;background:var(--ink);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{display:none;position:fixed;inset:0;background:rgba(8,20,43,.48);z-index:50}
    .drawer-overlay.open{display:block}
    .mobile-drawer{
      position:fixed;top:0;right:0;width:min(390px,88vw);height:100vh;z-index:60;
      background:#fff;transform:translateX(100%);transition:.28s ease;overflow:auto;
      box-shadow:-12px 0 35px rgba(0,0,0,.14)
    }
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{height:74px;padding:0 20px;display:flex;align-items:center;gap:14px;border-bottom:1px solid var(--line);font-weight:800}
    .drawer-head>a{margin-left:auto;color:var(--theme);font-size:14px}
    .drawer-close{border:0;background:none;font-size:28px;line-height:1;cursor:pointer;color:#68758a}
    .drawer-menu{padding:12px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid #edf0f4;background:none;text-align:left;font-size:15px;font-weight:700;cursor:pointer}
    .drawer-toggle:after{content:"＋";float:right;color:#8090a7}
    .drawer-toggle.active:after{content:"－"}
    .drawer-submenu{display:none;padding:4px 0 8px 16px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:13px}
    .footer{margin-top:80px;background:#101c31;color:#c5cfdd}
    .footer .container{padding:54px 0 22px}
    .footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:38px}
    .footer h3,.footer h4{margin:0 0 15px;color:#fff}
    .footer h3{font-size:20px}
    .footer h4{font-size:14px}
    .footer p{margin:7px 0;font-size:13px;color:#aeb9ca}
    .footer-grid>div>a{display:block;margin:7px 0;color:#aeb9ca;font-size:13px}
    .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:#8997aa}
    .download-page-main{background:linear-gradient(180deg,#f6f9fd 0,#fff 520px);padding:76px 0 0}
    .download-hero{text-align:center;max-width:820px;margin:0 auto 46px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 13px;border-radius:30px;background:#eaf1fc;color:var(--theme);font-size:13px;font-weight:800}
    .eyebrow:before{content:"";width:7px;height:7px;border-radius:50%;background:var(--theme)}
    .download-hero h1{margin:20px 0 14px;font-size:clamp(32px,5vw,58px);line-height:1.15;letter-spacing:-1px}
    .download-hero p{max-width:650px;margin:0 auto;color:var(--muted);font-size:17px}
    .download-actions{display:flex;justify-content:center;gap:12px;margin-top:27px;flex-wrap:wrap}
    .primary-btn,.secondary-btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 23px;border-radius:9px;font-size:14px;font-weight:800}
    .primary-btn{background:var(--theme);color:#fff;box-shadow:0 8px 18px rgba(11,61,145,.2)}
    .secondary-btn{background:#fff;color:var(--theme);border:1px solid #cdd8e7}
    .download-shell{padding:28px;border:1px solid var(--line);background:#fff;border-radius:24px;box-shadow:var(--shadow)}
    .download-shell-head{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:26px}
    .download-shell-head h2{margin:0;font-size:25px}
    .download-shell-head p{margin:0;color:var(--muted);font-size:14px}
    .download-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .download-step{position:relative;padding:23px 18px 20px;background:#f7f9fc;border:1px solid #e9edf3;border-radius:15px}
    .step-number{display:flex;width:34px;height:34px;align-items:center;justify-content:center;border-radius:50%;background:var(--theme);color:#fff;font-weight:800;font-size:14px}
    .download-step h3{margin:17px 0 7px;font-size:16px}
    .download-step p{margin:0;color:var(--muted);font-size:13px}
    .download-step:not(:last-child):after{content:"→";position:absolute;right:-15px;top:35px;color:#9aabc1;font-size:22px;z-index:2}
    .download-info{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:24px}
    .info-card{padding:25px;border:1px solid var(--line);border-radius:17px;background:#fff}
    .info-card h2{margin:0 0 16px;font-size:21px}
    .platform-list{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
    .platform-item{display:flex;align-items:center;gap:10px;padding:13px;background:#f7f9fc;border-radius:10px;font-size:14px}
    .platform-icon{width:30px;height:30px;display:grid;place-items:center;background:#e9f0fb;color:var(--theme);border-radius:8px;font-weight:800}
    .notice-list{margin:0;padding:0;list-style:none}
    .notice-list li{padding:10px 0;border-bottom:1px solid #edf0f4;color:var(--muted);font-size:13px}
    .notice-list li:last-child{border-bottom:0}
    .faq-section{margin-top:52px}
    .section-heading{text-align:center;margin-bottom:24px}
    .section-heading h2{margin:0 0 8px;font-size:29px}
    .section-heading p{margin:0;color:var(--muted);font-size:14px}
    .faq-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .faq-item{padding:20px 22px;border:1px solid var(--line);border-radius:14px;background:#fff}
    .faq-item h3{margin:0 0 8px;font-size:15px}
    .faq-item p{margin:0;color:var(--muted);font-size:13px}
    .download-note{margin-top:28px;padding:17px 20px;border-left:4px solid var(--theme);background:#f1f5fb;color:#5e6c80;font-size:13px;border-radius:0 10px 10px 0}
    @media (max-width:1050px){
      .main-nav{display:none}
      .hamburger{display:block}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media (max-width:720px){
      .container{width:min(100% - 28px,560px)}
      .topbar{height:auto;padding:8px 0}
      .topbar .container,.topbar-links{gap:8px;flex-wrap:wrap}
      .topbar-links{justify-content:flex-end}
      .account-btn,.member-btn{display:none}
      .download-page-main{padding-top:48px}
      .download-shell{padding:18px}
      .download-shell-head{display:block}
      .download-shell-head p{margin-top:7px}
      .download-steps{grid-template-columns:1fr 1fr}
      .download-step:not(:last-child):after{display:none}
      .download-info,.faq-grid{grid-template-columns:1fr}
      .platform-list{grid-template-columns:1fr}
      .footer-grid{grid-template-columns:1fr;gap:25px}
      .footer-bottom{display:block}
      .footer-bottom span{display:block;margin-top:8px}
    }
    @media (max-width:450px){
      .download-steps{grid-template-columns:1fr}
      .download-hero h1{font-size:35px}
      .download-hero p{font-size:15px}
    }