:root{--theme:#0B3D91;--ink:#102033;--muted:#667085;--line:#e5eaf0;--soft:#f5f8fb;--accent:#c88a22;--max:1200px}
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;background:#fff;line-height:1.7}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block}
    .container{width:min(var(--max),calc(100% - 40px));margin:0 auto}
    .topbar{background:#102033;color:#dbe5ef;font-size:13px}
    .topbar .container{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar strong{color:#fff}
    .topbar-links{display:flex;gap:20px}
    .topbar a:hover{color:#fff}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:78px;display:flex;align-items:center;gap:32px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;color:var(--theme);font-weight:800;font-size:19px}
    .logo img{width:36px;height:36px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:stretch;justify-content:center;gap:4px;margin:0;padding:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:5px;height:78px;padding:0 15px;color:#344054;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"⌄";font-size:13px;color:#98a2b3}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(8px);width:300px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:0 0 12px 12px;box-shadow:0 18px 40px rgba(16,32,51,.14);opacity:0;visibility:hidden;transition:.2s;z-index:30}
    .mega-menu{width:650px}
    .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)}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .mega-title{margin:0 0 12px;color:var(--theme);font-weight:800;font-size:14px}
    .dropdown-panel>a{display:block;padding:8px 0;border-bottom:1px solid #f0f2f5;font-size:14px}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
    .mega-card{display:flex;gap:10px;align-items:center;padding:9px;border:1px solid #edf0f3;border-radius:8px;font-size:13px}
    .mega-card:hover{border-color:#b8cbe4;background:#f8fbff}
    .mega-card img{width:34px;height:34px;object-fit:cover;border-radius:6px}
    .mega-card span{min-width:0}
    .mega-card b,.mega-card small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .mega-card b{font-size:13px}.mega-card small{color:var(--muted);font-size:11px}
    .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:14px;color:#475467}
    .account-btn{padding:9px 16px;border-radius:6px;background:var(--theme);color:#fff;font-size:14px}
    .account-btn:hover{background:#082f70}
    .hamburger{display:none;width:40px;height:40px;padding:8px;border:1px solid var(--line);border-radius:6px;background:#fff;cursor:pointer}
    .hamburger span{display:block;width:22px;height:2px;margin:4px auto;background:var(--theme);transition:.2s}
    .hamburger.active span:nth-child(1){transform:translateY(6px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
    .drawer-overlay{position:fixed;inset:0;background:rgba(10,22,36,.5);opacity:0;visibility:hidden;z-index:40;transition:.25s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:0;width:min(380px,88vw);height:100vh;background:#fff;z-index:41;transform:translateX(100%);transition:.25s;overflow:auto}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:15px;padding:20px;border-bottom:1px solid var(--line);font-weight:700;color:var(--theme)}
    .drawer-head a{margin-left:auto;padding:6px 12px;border-radius:5px;background:var(--theme);color:#fff;font-size:13px}
    .drawer-close{border:0;background:none;font-size:28px;color:#667085;cursor:pointer}
    .drawer-menu{padding:10px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;border:0;border-bottom:1px solid var(--line);background:none;text-align:left;color:#344054;font-size:15px;cursor:pointer}
    .drawer-toggle:after{content:"＋";float:right;color:#98a2b3}
    .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:7px 0;color:#667085;font-size:14px}
    .footer{margin-top:80px;background:#102033;color:#c9d5e2}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;padding:52px 0 38px}
    .footer h3{margin:0 0 12px;color:#fff;font-size:20px}.footer h4{margin:0 0 14px;color:#fff;font-size:15px}
    .footer p{margin:7px 0;color:#9fb0c0;font-size:13px}.footer a{display:block;margin:7px 0;color:#aebdcc;font-size:13px}.footer a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;padding:18px 0;border-top:1px solid rgba(255,255,255,.12);color:#93a5b7;font-size:12px}
    .download-page-main{background:linear-gradient(180deg,#f7faff 0,#fff 440px);padding:72px 0 10px}
    .download-intro{text-align:center;max-width:760px;margin:0 auto 42px}
    .eyebrow{display:inline-block;margin-bottom:12px;padding:5px 13px;border-radius:30px;background:#e7effa;color:var(--theme);font-size:13px;font-weight:700}
    .download-intro h1{margin:0 0 16px;font-size:clamp(32px,5vw,54px);line-height:1.2;letter-spacing:-1px;color:#102033}
    .download-intro p{margin:0;color:var(--muted);font-size:17px}
    .download-layout{display:grid;grid-template-columns:1.25fr .75fr;gap:24px;align-items:stretch}
    .download-panel,.notice-panel,.faq-panel{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:0 12px 30px rgba(16,32,51,.06)}
    .download-panel{padding:30px}
    .panel-heading{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:22px}
    .panel-heading h2,.notice-panel h2,.faq-panel h2{margin:0;font-size:22px;color:#102033}
    .status{color:#22804a;font-size:13px;font-weight:700}.status:before{content:"";display:inline-block;width:8px;height:8px;margin-right:7px;border-radius:50%;background:#35a866}
    .software-list{display:grid;gap:14px}
    .software-item{display:flex;align-items:center;gap:15px;padding:18px;border:1px solid #e6edf5;border-radius:12px;transition:.2s}
    .software-item:hover{border-color:#9bb7d9;box-shadow:0 7px 18px rgba(11,61,145,.08)}
    .software-icon{width:46px;height:46px;display:grid;place-items:center;border-radius:11px;background:#e9f0fa;color:var(--theme);font-weight:800;font-size:18px}
    .software-copy{flex:1}.software-copy h3{margin:0 0 3px;font-size:16px}.software-copy p{margin:0;color:var(--muted);font-size:13px}
    .download-link{padding:9px 14px;border-radius:6px;background:var(--theme);color:#fff;font-size:13px;white-space:nowrap}
    .notice-panel{padding:30px;background:#102033;color:#dbe5ef}
    .notice-panel h2{color:#fff;margin-bottom:18px}
    .notice-panel p{margin:0 0 20px;color:#aebdcc;font-size:14px}
    .steps{display:grid;gap:18px}.step{display:grid;grid-template-columns:34px 1fr;gap:12px}.step-num{width:30px;height:30px;display:grid;place-items:center;border-radius:50%;background:var(--accent);color:#fff;font-weight:800;font-size:13px}
    .step h3{margin:0;color:#fff;font-size:15px}.step span{display:block;color:#aebdcc;font-size:13px}
    .download-lower{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:24px}
    .faq-panel{padding:30px}.faq-panel h2{margin-bottom:18px}
    details{padding:13px 0;border-bottom:1px solid var(--line)}summary{cursor:pointer;font-weight:700;font-size:14px}details p{margin:9px 0 0;color:var(--muted);font-size:13px}
    .security-box{padding:24px;border-radius:16px;background:#fff8ea;border:1px solid #f1d59d;color:#6d4b12}.security-box h2{margin:0 0 10px;font-size:20px}.security-box p{margin:0;font-size:14px}
    @media(max-width:980px){.main-nav{display:none}.hamburger{display:block}.member-link{display:none}.header-inner{justify-content:space-between}.download-layout,.download-lower{grid-template-columns:1fr}}
    @media(max-width:620px){.container{width:min(100% - 28px,var(--max))}.topbar .container{padding:8px 0;display:block}.topbar-links{gap:12px;margin-top:3px}.header-inner{height:66px}.nav-link{height:66px}.logo{min-width:0;font-size:16px}.account-btn{display:none}.download-page-main{padding:48px 0 0}.download-panel,.notice-panel,.faq-panel{padding:22px}.download-intro p{font-size:15px}.software-item{align-items:flex-start;flex-wrap:wrap}.software-copy{min-width:calc(100% - 65px)}.download-link{margin-left:61px}.footer-grid{grid-template-columns:1fr 1fr;gap:25px;padding:38px 0}.footer-brand{grid-column:1/-1}.footer-bottom{display:block}.footer-bottom span{display:block;margin:5px 0}}