:root{
      --theme:#0B3D91;
      --theme-dark:#072b68;
      --theme-soft:#eaf1fc;
      --ink:#172033;
      --muted:#647086;
      --line:#dce3ee;
      --surface:#ffffff;
      --background:#f5f7fb;
      --success:#16805b;
      --shadow:0 14px 34px rgba(18,39,72,.1);
      --radius:8px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;background:var(--background);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.7;letter-spacing:0}
    body,button,input{font:inherit}
    img{display:block;max-width:100%}
    a{color:inherit;text-decoration:none}
    button{color:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .topbar{background:#10233f;color:#dbe6f6;font-size:13px}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar .container>span:last-child{display:flex;gap:20px}
    .topbar a:hover{color:#fff}
    .header{position:relative;z-index:50;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 4px 18px rgba(18,39,72,.04)}
    .header-inner{min-height:76px;display:flex;align-items:center;gap:24px}
    .logo{display:flex;align-items:center;gap:10px;min-width:170px;color:var(--theme);font-size:18px;font-weight:800}
    .logo img{width:42px;height:42px;object-fit:contain}
    .logo span{overflow-wrap:anywhere}
    .main-nav{flex:1;align-self:stretch}
    .nav-list{height:100%;margin:0;padding:0;display:flex;align-items:stretch;justify-content:center;list-style:none}
    .nav-item{position:relative;display:flex;align-items:center}
    .nav-link{height:100%;padding:0 13px;display:flex;align-items:center;font-size:15px;font-weight:600;white-space:nowrap;border-bottom:3px solid transparent}
    .nav-link:hover,.nav-item:focus-within>.nav-link{color:var(--theme);border-bottom-color:var(--theme)}
    .has-arrow::after{content:"";width:6px;height:6px;margin-left:7px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg) translateY(-2px)}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:0;z-index:60;background:#fff;border:1px solid var(--line);border-radius:0 0 var(--radius) var(--radius);box-shadow:var(--shadow);visibility:hidden;opacity:0;transform:translateY(8px);pointer-events:none;transition:.18s ease}
    .dropdown-panel{width:280px;padding:10px}
    .dropdown-panel a{display:block;padding:10px 12px;border-radius:6px;color:#344158;font-size:14px}
    .dropdown-panel a:hover{background:var(--theme-soft);color:var(--theme)}
    .mega-menu{left:50%;width:min(820px,80vw);padding:20px;transform:translate(-50%,8px)}
    .nav-item:nth-last-child(-n+3) .mega-menu{left:auto;right:0;transform:translateY(8px)}
    .nav-item:hover>.dropdown-panel,.nav-item:focus-within>.dropdown-panel{visibility:visible;opacity:1;transform:translateY(0);pointer-events:auto}
    .nav-item:hover>.mega-menu,.nav-item:focus-within>.mega-menu{visibility:visible;opacity:1;transform:translate(-50%,0);pointer-events:auto}
    .nav-item:nth-last-child(-n+3):hover>.mega-menu,.nav-item:nth-last-child(-n+3):focus-within>.mega-menu{transform:translateY(0)}
    .mega-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
    .mega-card{min-width:0;padding:12px;display:grid;grid-template-columns:44px minmax(0,1fr);column-gap:10px;align-items:center;border:1px solid #e5eaf2;border-radius:var(--radius);background:#fff}
    .mega-card:hover{border-color:#a8bfe3;background:#f7faff}
    .mega-card img{grid-row:1/4;width:44px;height:44px;border-radius:6px;object-fit:cover;background:#eef2f8}
    .mega-card strong,.mega-card small{min-width:0;overflow:hidden;text-overflow:ellipsis}
    .mega-card strong{font-size:14px;white-space:nowrap}
    .mega-card small{color:var(--muted);font-size:12px;line-height:1.45}
    .mega-footer{display:block;margin-top:14px;padding:11px;text-align:center;border-radius:6px;background:var(--theme-soft);color:var(--theme);font-weight:700}
    .header-btns{display:flex;align-items:center;gap:9px;white-space:nowrap}
    .member-link{color:var(--theme);font-size:14px;font-weight:700}
    .open-account{padding:9px 15px;border-radius:6px;background:var(--theme);color:#fff;font-size:14px;font-weight:700}
    .open-account:hover{background:var(--theme-dark)}
    .hamburger{width:42px;height:42px;padding:9px;display:none;flex-direction:column;align-items:center;justify-content:center;gap:5px;border:1px solid var(--line);border-radius:6px;background:#fff;cursor:pointer}
    .hamburger span{width:20px;height:2px;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{position:fixed;inset:0;z-index:79;background:rgba(8,18,34,.5);visibility:hidden;opacity:0;transition:.2s}
    .drawer-overlay.open{visibility:visible;opacity:1}
    .mobile-drawer{position:fixed;top:0;right:0;z-index:80;width:min(380px,90vw);height:100dvh;background:#fff;box-shadow:-16px 0 40px rgba(7,25,52,.2);transform:translateX(105%);transition:.25s ease;overflow-y:auto}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{min-height:72px;padding:14px 18px;display:flex;align-items:center;gap:14px;border-bottom:1px solid var(--line);color:var(--theme);font-weight:700}
    .drawer-head>a{padding:7px 12px;border-radius:6px;background:var(--theme);color:#fff}
    .drawer-close{margin-left:auto;width:38px;height:38px;border:0;background:#eef2f7;border-radius:6px;font-size:26px;line-height:1;cursor:pointer}
    .drawer-menu{padding:12px 18px 30px}
    .drawer-link,.drawer-toggle{width:100%;padding:13px 4px;display:flex;align-items:center;justify-content:space-between;border:0;border-bottom:1px solid #e8edf4;background:transparent;text-align:left;font-weight:700;cursor:pointer}
    .drawer-toggle::after{content:"+";font-size:20px;color:var(--theme)}
    .drawer-toggle.active::after{content:"−"}
    .drawer-submenu{max-height:0;overflow:hidden;background:#f7f9fc;transition:max-height .25s ease}
    .drawer-submenu.open{max-height:560px}
    .drawer-submenu a{display:block;padding:10px 14px;color:#4c5970;font-size:14px;border-bottom:1px solid #e7ecf3}
    .drawer-submenu a:hover{color:var(--theme)}
    .target-page-main.download-page-main{min-height:650px}
    .download-page-main .download-hero{padding:72px 0 56px;background:linear-gradient(180deg,#edf3fc 0%,#f8faff 100%);border-bottom:1px solid var(--line)}
    .download-page-main .hero-inner{text-align:center}
    .download-page-main .eyebrow{display:inline-flex;align-items:center;gap:8px;margin:0 0 14px;color:var(--theme);font-size:14px;font-weight:800}
    .download-page-main .eyebrow::before,.download-page-main .eyebrow::after{content:"";width:28px;height:1px;background:#9db7df}
    .download-page-main h1{max-width:850px;margin:0 auto 16px;font-size:clamp(34px,5vw,58px);line-height:1.15;letter-spacing:0;color:#10233f}
    .download-page-main .hero-copy{max-width:720px;margin:0 auto;color:var(--muted);font-size:17px}
    .download-page-main .hero-actions{margin-top:28px;display:flex;justify-content:center;flex-wrap:wrap;gap:12px}
    .download-page-main .primary-action,.download-page-main .secondary-action{min-height:48px;padding:11px 22px;display:inline-flex;align-items:center;justify-content:center;border-radius:6px;font-weight:800}
    .download-page-main .primary-action{background:var(--theme);color:#fff;box-shadow:0 10px 24px rgba(11,61,145,.22)}
    .download-page-main .primary-action:hover{background:var(--theme-dark)}
    .download-page-main .secondary-action{border:1px solid #b8c7dc;background:#fff;color:var(--theme)}
    .download-page-main .trust-row{margin-top:30px;display:flex;justify-content:center;flex-wrap:wrap;gap:24px;color:#526078;font-size:14px}
    .download-page-main .trust-row span{display:flex;align-items:center;gap:8px}
    .download-page-main .trust-row span::before{content:"✓";width:22px;height:22px;display:grid;place-items:center;border-radius:50%;background:#dff4eb;color:var(--success);font-weight:900}
    .download-page-main .section{padding:72px 0}
    .download-page-main .section-white{background:#fff}
    .download-page-main .section-heading{max-width:700px;margin:0 auto 36px;text-align:center}
    .download-page-main .section-heading h2{margin:0 0 10px;font-size:32px;line-height:1.3;color:#14243d}
    .download-page-main .section-heading p{margin:0;color:var(--muted)}
    .download-page-main .download-panel{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(280px,.65fr);gap:24px;align-items:stretch}
    .download-page-main .platform-list{display:grid;gap:14px}
    .download-page-main .platform-card{padding:22px;display:grid;grid-template-columns:52px minmax(0,1fr) auto;gap:16px;align-items:center;border:1px solid var(--line);border-radius:var(--radius);background:#fff;box-shadow:0 8px 22px rgba(18,39,72,.06)}
    .download-page-main .platform-icon{width:52px;height:52px;display:grid;place-items:center;border-radius:8px;background:var(--theme-soft);color:var(--theme);font-size:22px;font-weight:900}
    .download-page-main .platform-copy h3{margin:0 0 3px;font-size:18px}
    .download-page-main .platform-copy p{margin:0;color:var(--muted);font-size:14px}
    .download-page-main .platform-card a{padding:9px 15px;border:1px solid #b6c6de;border-radius:6px;color:var(--theme);font-size:14px;font-weight:800}
    .download-page-main .platform-card a:hover{background:var(--theme);border-color:var(--theme);color:#fff}
    .download-page-main .account-box{padding:30px;display:flex;flex-direction:column;justify-content:center;border-radius:var(--radius);background:#102b54;color:#fff;box-shadow:var(--shadow)}
    .download-page-main .account-box .box-label{margin:0 0 10px;color:#adc7ee;font-size:13px;font-weight:800}
    .download-page-main .account-box h3{margin:0 0 12px;font-size:26px;line-height:1.35}
    .download-page-main .account-box p{margin:0 0 24px;color:#d5e1f2}
    .download-page-main .account-box a{padding:12px 18px;text-align:center;border-radius:6px;background:#fff;color:var(--theme);font-weight:800}
    .download-page-main .steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;counter-reset:steps}
    .download-page-main .step{position:relative;padding:28px 24px;border-top:4px solid var(--theme);border-radius:var(--radius);background:#fff;box-shadow:var(--shadow);counter-increment:steps}
    .download-page-main .step::before{content:"0" counter(steps);display:block;margin-bottom:20px;color:#9eb5d6;font-size:32px;font-weight:900;line-height:1}
    .download-page-main .step h3{margin:0 0 9px;font-size:20px}
    .download-page-main .step p{margin:0;color:var(--muted)}
    .download-page-main .notice{margin-top:26px;padding:17px 20px;border-left:4px solid #d59622;border-radius:4px;background:#fff8e9;color:#61502f}
    .download-page-main .requirements{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .download-page-main .requirement{padding:22px;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
    .download-page-main .requirement strong{display:block;margin-bottom:7px;color:#172a48}
    .download-page-main .requirement span{color:var(--muted);font-size:14px}
    .download-page-main .faq-list{max-width:880px;margin:0 auto;display:grid;gap:12px}
    .download-page-main details{border:1px solid var(--line);border-radius:var(--radius);background:#fff}
    .download-page-main summary{padding:18px 52px 18px 20px;position:relative;cursor:pointer;font-weight:800;list-style:none}
    .download-page-main summary::-webkit-details-marker{display:none}
    .download-page-main summary::after{content:"+";position:absolute;right:20px;top:14px;color:var(--theme);font-size:24px}
    .download-page-main details[open] summary::after{content:"−"}
    .download-page-main details p{margin:0;padding:0 20px 20px;color:var(--muted)}
    .download-page-main .final-cta{padding:48px 0;background:var(--theme)}
    .download-page-main .cta-inner{display:flex;align-items:center;justify-content:space-between;gap:30px;color:#fff}
    .download-page-main .cta-inner h2{margin:0 0 6px;font-size:28px}
    .download-page-main .cta-inner p{margin:0;color:#d8e5f8}
    .download-page-main .cta-inner a{flex:0 0 auto;padding:12px 22px;border-radius:6px;background:#fff;color:var(--theme);font-weight:900}
    .footer{padding:54px 0 0;background:#10233f;color:#d9e2ef}
    .footer-grid{display:grid;grid-template-columns:1.35fr repeat(3,1fr);gap:42px}
    .footer h3,.footer-brand strong{display:block;margin:0 0 16px;color:#fff;font-size:17px}
    .footer p{margin:7px 0;color:#aebdd0;font-size:14px}
    .footer-grid>div>a{display:block;margin:9px 0;color:#bdcadb;font-size:14px}
    .footer-grid>div>a:hover{color:#fff}
    .footer-bottom{margin-top:40px;padding:20px 0;display:flex;justify-content:space-between;gap:20px;border-top:1px solid rgba(255,255,255,.12);color:#92a4bc;font-size:13px}
    @media (max-width:1080px){
      .main-nav{display:none}
      .header-inner{min-height:68px}
      .header-btns{margin-left:auto}
      .hamburger{display:flex}
      .download-page-main .requirements{grid-template-columns:repeat(2,minmax(0,1fr))}
      .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
    }
    @media (max-width:760px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{padding:8px 0;align-items:flex-start;flex-direction:column;gap:3px}
      .topbar .container>span:last-child{flex-wrap:wrap;gap:4px 14px}
      .logo{min-width:0;font-size:16px}
      .logo img{width:36px;height:36px}
      .member-link{display:none}
      .open-account{padding:8px 12px}
      .download-page-main .download-hero{padding:52px 0 42px}
      .download-page-main h1{font-size:36px}
      .download-page-main .hero-copy{font-size:16px}
      .download-page-main .section{padding:54px 0}
      .download-page-main .section-heading h2{font-size:27px}
      .download-page-main .download-panel{grid-template-columns:1fr}
      .download-page-main .platform-card{grid-template-columns:46px minmax(0,1fr)}
      .download-page-main .platform-icon{width:46px;height:46px}
      .download-page-main .platform-card>a{grid-column:1/-1;text-align:center}
      .download-page-main .steps{grid-template-columns:1fr}
      .download-page-main .requirements{grid-template-columns:1fr}
      .download-page-main .cta-inner{align-items:flex-start;flex-direction:column}
      .footer-grid{grid-template-columns:1fr;gap:26px}
      .footer-bottom{align-items:flex-start;flex-direction:column}
    }
    @media (max-width:420px){
      .header-inner{gap:8px}
      .logo span{max-width:120px}
      .open-account{display:none}
      .download-page-main h1{font-size:31px}
      .download-page-main .hero-actions{flex-direction:column}
      .download-page-main .primary-action,.download-page-main .secondary-action{width:100%}
    }