:root{
      --theme:#0B3D91;
      --ink:#10213f;
      --muted:#66748d;
      --line:#dce5f1;
      --soft:#f4f7fb;
      --white:#fff;
      --accent:#2c7be5;
      --shadow:0 18px 50px rgba(16,33,63,.10);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f8fafc;font-family:"PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.7}
    a{color:inherit;text-decoration:none}
    button{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .topbar{background:#081a38;color:#b9c9e5;font-size:13px}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between}
    .topbar-links{display:flex;gap:24px}
    .topbar a:hover{color:#fff}
    .header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(16px)}
    .header-inner{height:76px;display:flex;align-items:center;gap:34px}
    .logo{display:flex;align-items:center;gap:11px;min-width:180px;color:var(--theme);font-weight:800;font-size:19px}
    .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:25px 14px;color:#35445e;font-size:14px;font-weight:600;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%;opacity:0;visibility:hidden;transform:translate(-50%,8px);transition:.2s ease;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:0 0 16px 16px}
    .dropdown-panel{width:250px;padding:12px}
    .dropdown-panel a{display:block;padding:10px 12px;border-radius:8px;font-size:13px}
    .dropdown-panel a:hover{background:var(--soft);color:var(--theme)}
    .mega-menu{width:760px;padding:22px}
    .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:translate(-50%,0)}
    .mega-heading{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:16px}
    .mega-heading strong{font-size:17px}
    .mega-heading span{font-size:12px;color:var(--muted)}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
    .mega-card{display:grid;grid-template-columns:40px 1fr;column-gap:10px;padding:12px;border:1px solid var(--line);border-radius:12px}
    .mega-card:hover{border-color:#9bbce9;background:#f7faff}
    .mega-card img{grid-row:span 3;width:40px;height:40px;object-fit:contain;border-radius:8px}
    .mega-card strong{font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .mega-card small{font-size:11px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .mega-footer{display:flex;flex-wrap:wrap;gap:12px;margin-top:17px;padding-top:14px;border-top:1px solid var(--line);font-size:12px;color:var(--theme)}
    .header-btns{display:flex;align-items:center;gap:12px;white-space:nowrap}
    .member-link{font-size:13px;color:var(--theme)}
    .account-link{padding:8px 16px;color:#fff;background:var(--theme);border-radius:8px;font-size:13px;font-weight:700}
    .hamburger{display:none;border:0;background:none;padding:8px;cursor:pointer}
    .hamburger span{display:block;width:23px;height:2px;margin:5px 0;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:29;background:rgba(4,18,42,.48);opacity:0;visibility:hidden;transition:.25s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:0;bottom:0;z-index:30;width:min(390px,88vw);padding:22px;background:#fff;box-shadow:-15px 0 45px rgba(0,0,0,.18);transform:translateX(100%);transition:.3s;overflow:auto}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:18px;padding-bottom:18px;border-bottom:1px solid var(--line)}
    .drawer-head strong{flex:1;color:var(--theme)}
    .drawer-head a{padding:5px 12px;color:#fff;background:var(--theme);border-radius:6px;font-size:13px}
    .drawer-close{border:0;background:none;font-size:28px;line-height:1;color:var(--muted);cursor:pointer}
    .drawer-menu{padding-top:12px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 2px;border:0;border-bottom:1px solid #edf1f6;background:none;text-align:left;color:var(--ink);font-weight:600;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:20px;font-weight:400}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:5px 0 8px 14px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:7px 0;color:var(--muted);font-size:13px}
    .footer{padding:58px 0 20px;background:#081a38;color:#b9c9e5}
    .footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.3fr;gap:36px}
    .footer-brand strong{display:block;margin-bottom:12px;color:#fff;font-size:20px}
    .footer p{margin:8px 0;font-size:13px}
    .footer h3{margin:0 0 13px;color:#fff;font-size:14px}
    .footer-grid>div:not(.footer-brand) a,.footer-grid>div:not(.footer-brand) span{display:block;margin:7px 0;color:#b9c9e5;font-size:13px}
    .footer a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:42px;padding-top:18px;border-top:1px solid rgba(255,255,255,.15);font-size:12px}
    .download-page-main{padding:70px 0 90px}
    .download-hero{text-align:center;max-width:760px;margin:0 auto 44px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:6px 13px;border:1px solid #bcd0ed;border-radius:999px;color:var(--theme);background:#eef5ff;font-size:12px;font-weight:700}
    .eyebrow:before{content:"";width:7px;height:7px;border-radius:50%;background:#35a1ff}
    .download-hero h1{margin:18px 0 12px;color:#0c2348;font-size:clamp(32px,5vw,54px);line-height:1.2;letter-spacing:-1px}
    .download-hero p{margin:0;color:var(--muted);font-size:16px}
    .download-panel{display:grid;grid-template-columns:1.1fr .9fr;gap:28px;align-items:stretch}
    .download-card,.system-card,.step-card,.faq-card{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:0 12px 35px rgba(16,33,63,.06)}
    .download-card{padding:34px}
    .download-card h2{margin:0 0 8px;font-size:25px}
    .download-card>p{margin:0 0 24px;color:var(--muted)}
    .terminal{padding:20px;border-radius:14px;background:#0b1c39;color:#dbe9ff}
    .terminal-label{display:flex;align-items:center;gap:6px;margin-bottom:16px;color:#93bdf5;font-size:12px}
    .terminal-label i{width:8px;height:8px;border-radius:50%;background:#55d5a0}
    .terminal-row{display:flex;justify-content:space-between;padding:9px 0;border-bottom:1px solid rgba(255,255,255,.1);font-size:13px}
    .terminal-row:last-child{border:0}
    .terminal-row span:last-child{color:#8ed3ff}
    .download-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .primary-btn,.secondary-btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 20px;border-radius:9px;font-size:14px;font-weight:700}
    .primary-btn{color:#fff;background:var(--theme)}
    .secondary-btn{color:var(--theme);border:1px solid #adc5e8;background:#f6f9ff}
    .system-card{padding:28px;background:linear-gradient(150deg,#eef5ff,#fff)}
    .system-card h3{margin:0 0 18px;font-size:20px}
    .system-list{display:grid;gap:12px;margin:0;padding:0;list-style:none}
    .system-list li{display:flex;align-items:center;gap:12px;padding:13px;background:#fff;border:1px solid #e1eaf5;border-radius:12px}
    .system-icon{display:grid;place-items:center;width:34px;height:34px;border-radius:9px;color:#fff;background:var(--theme);font-size:13px;font-weight:800}
    .system-list strong{display:block;font-size:14px}
    .system-list small{display:block;color:var(--muted);font-size:12px}
    .steps-section,.faq-section{margin-top:58px}
    .section-heading{display:flex;align-items:end;justify-content:space-between;margin-bottom:20px}
    .section-heading h2{margin:0;font-size:28px}
    .section-heading p{margin:0;color:var(--muted);font-size:13px}
    .steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .step-card{padding:25px}
    .step-number{color:var(--accent);font-size:13px;font-weight:800;letter-spacing:1px}
    .step-card h3{margin:12px 0 7px;font-size:18px}
    .step-card p{margin:0;color:var(--muted);font-size:13px}
    .faq-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
    .faq-card{padding:23px}
    .faq-card h3{margin:0 0 8px;font-size:16px}
    .faq-card p{margin:0;color:var(--muted);font-size:13px}
    .download-note{margin-top:30px;padding:16px 20px;border-left:3px solid var(--theme);background:#edf4ff;color:#50617b;font-size:13px}
    @media(max-width:980px){
      .main-nav{display:none}
      .hamburger{display:block}
      .download-panel{grid-template-columns:1fr}
    }
    @media(max-width:700px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{align-items:flex-start;flex-direction:column;padding:7px 0}
      .topbar-links{gap:12px;flex-wrap:wrap}
      .header-inner{height:66px;gap:10px}
      .logo{min-width:0;flex:1;font-size:16px}
      .logo img{width:32px;height:32px}
      .member-link{display:none}
      .download-page-main{padding:45px 0 65px}
      .download-card,.system-card{padding:23px}
      .steps-grid,.faq-grid{grid-template-columns:1fr}
      .section-heading{display:block}
      .section-heading p{margin-top:5px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:25px}
      .footer-brand{grid-column:1/-1}
      .footer-bottom{align-items:flex-start;flex-direction:column;gap:5px}
    }