:root{
      --brand:#0B3D91;
      --brand-dark:#07275f;
      --brand-light:#eaf1ff;
      --accent:#ffcf3f;
      --green:#16845b;
      --ink:#101828;
      --muted:#5f6b7a;
      --line:#dfe5ee;
      --surface:#f5f7fb;
      --white:#fff;
      --shadow:0 18px 50px rgba(11,61,145,.12);
      --radius:18px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:var(--white);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.65}
    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:var(--brand-dark);color:#dfeaff;font-size:13px}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar a{margin-left:20px;color:#fff}
    .topbar a:hover{text-decoration:underline}

    .header{position:relative;z-index:50;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;flex:0 0 auto;color:var(--brand);font-size:20px;font-weight:900;letter-spacing:-.4px}
    .logo img{width:42px;height:42px;object-fit:contain}
    .main-nav{flex:1;align-self:stretch}
    .nav-list{height:100%;display:flex;align-items:stretch;justify-content:center;gap:2px;margin:0;padding:0;list-style:none}
    .nav-item{position:relative;display:flex;align-items:center}
    .nav-link{height:100%;display:flex;align-items:center;padding:0 13px;font-size:15px;font-weight:700;white-space:nowrap;border-bottom:3px solid transparent}
    .nav-link:hover,.nav-item:focus-within>.nav-link{color:var(--brand);border-bottom-color:var(--brand)}
    .has-arrow::after{content:"";width:6px;height:6px;margin:-4px 0 0 8px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg)}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;z-index:60;visibility:hidden;opacity:0;transform:translate(-50%,10px);background:#fff;border:1px solid var(--line);border-top:3px solid var(--brand);box-shadow:var(--shadow);transition:.2s ease}
    .dropdown-panel{width:330px;padding:18px}
    .mega-menu{width:min(760px,80vw);display:grid;grid-template-columns:1.25fr .75fr;gap:22px;padding:24px}
    .nav-item:hover>.dropdown-panel,.nav-item:hover>.mega-menu,.nav-item:focus-within>.dropdown-panel,.nav-item:focus-within>.mega-menu{visibility:visible;opacity:1;transform:translate(-50%,0)}
    .dropdown-panel::before,.mega-menu::before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .panel-title{margin-bottom:12px;color:var(--brand);font-size:14px;font-weight:900}
    .panel-link{display:flex;justify-content:space-between;gap:12px;padding:9px 0;border-bottom:1px solid #edf0f5;font-size:14px}
    .panel-link small{color:var(--muted);white-space:nowrap}
    .panel-link:hover{color:var(--brand)}
    .mega-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}
    .mega-section{min-width:0}
    .mega-section p{margin:0 0 18px;color:var(--muted);font-size:14px}
    .mega-card{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:3px 9px;margin-bottom:8px;padding:11px;border:1px solid var(--line);border-radius:10px;background:#fbfcff}
    .mega-card img{grid-row:1/3;width:30px;height:30px;object-fit:contain}
    .mega-card strong,.mega-card small{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .mega-card strong{font-size:14px}
    .mega-card small{grid-column:1/-1;color:var(--muted);font-size:12px}
    .mega-card img+strong+small{grid-column:2}
    .mega-card:hover{border-color:var(--brand);background:var(--brand-light)}
    .mega-footer{display:block;margin-top:12px;padding:10px 13px;border-radius:8px;background:var(--brand);color:#fff;text-align:center;font-size:13px;font-weight:800}
    .mega-footer:hover{background:var(--brand-dark)}
    .header-btns{display:flex;align-items:center;gap:8px;flex:0 0 auto}
    .member-btn,.open-btn{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:0 15px;border-radius:9px;font-size:14px;font-weight:800}
    .member-btn{border:1px solid var(--brand);color:var(--brand)}
    .open-btn{background:var(--brand);color:#fff}
    .member-btn:hover{background:var(--brand-light)}
    .open-btn:hover{background:var(--brand-dark)}
    .hamburger{display:none;width:42px;height:42px;padding:10px;border:1px solid var(--line);border-radius:9px;background:#fff;cursor:pointer}
    .hamburger span{display:block;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:90;visibility:hidden;background:rgba(4,16,35,.56);opacity:0;transition:.25s}
    .drawer-overlay.open{visibility:visible;opacity:1}
    .mobile-drawer{position:fixed;top:0;right:0;bottom:0;z-index:100;width:min(390px,90vw);overflow-y:auto;background:#fff;box-shadow:-20px 0 50px rgba(0,0,0,.16);transform:translateX(105%);transition:.28s ease}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{min-height:68px;display:flex;align-items:center;gap:14px;padding:12px 18px;background:var(--brand);color:#fff;font-weight:800}
    .drawer-head>a{padding:6px 10px;border:1px solid rgba(255,255,255,.5);border-radius:7px}
    .drawer-close{margin-left:auto;padding:0;border:0;background:none;color:#fff;font-size:34px;line-height:1;cursor:pointer}
    .drawer-menu{padding:14px 18px 30px}
    .drawer-link,.drawer-toggle{width:100%;display:flex;align-items:center;justify-content:space-between;padding:14px 4px;border:0;border-bottom:1px solid var(--line);background:none;text-align:left;font-weight:800;cursor:pointer}
    .drawer-toggle::after{content:"+";color:var(--brand);font-size:21px}
    .drawer-toggle.active::after{content:"−"}
    .drawer-submenu{display:none;padding:7px 0 8px 16px;border-bottom:1px solid var(--line)}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:9px 4px;color:var(--muted);font-size:14px}
    .drawer-submenu a:hover{color:var(--brand)}

    .target-page-main.download-page-main{overflow:hidden;background:#fff}
    .download-page-main .download-intro{position:relative;padding:84px 0 74px;background:linear-gradient(145deg,#eef4ff 0%,#fff 58%,#fff7da 100%);border-bottom:1px solid var(--line)}
    .download-page-main .download-intro::before,.download-page-main .download-intro::after{content:"";position:absolute;border:2px solid var(--ink);opacity:.08;transform:rotate(10deg)}
    .download-page-main .download-intro::before{top:50px;left:5%;width:90px;height:90px;border-radius:24px}
    .download-page-main .download-intro::after{right:7%;bottom:40px;width:130px;height:70px;border-radius:50%}
    .download-page-main .breadcrumb{display:flex;justify-content:center;gap:8px;margin-bottom:18px;color:var(--muted);font-size:14px}
    .download-page-main .breadcrumb a:hover{color:var(--brand)}
    .download-page-main .intro-content{position:relative;z-index:1;max-width:840px;margin:auto;text-align:center}
    .download-page-main .eyebrow{display:inline-flex;align-items:center;gap:8px;margin-bottom:16px;padding:7px 13px;border:1px solid var(--ink);border-radius:999px;background:var(--accent);font-size:13px;font-weight:900}
    .download-page-main h1{margin:0;color:var(--ink);font-size:clamp(38px,6vw,66px);line-height:1.08;letter-spacing:-2px}
    .download-page-main .intro-copy{max-width:700px;margin:22px auto 0;color:var(--muted);font-size:18px}
    .download-page-main .intro-actions{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:30px}
    .download-page-main .primary-action,.download-page-main .secondary-action{display:inline-flex;align-items:center;justify-content:center;min-height:50px;padding:0 23px;border:2px solid var(--ink);border-radius:12px;font-weight:900;box-shadow:4px 4px 0 var(--ink);transition:.18s}
    .download-page-main .primary-action{background:var(--brand);color:#fff}
    .download-page-main .secondary-action{background:#fff}
    .download-page-main .primary-action:hover,.download-page-main .secondary-action:hover{box-shadow:1px 1px 0 var(--ink);transform:translate(3px,3px)}
    .download-page-main .intro-note{margin:19px 0 0;color:var(--muted);font-size:13px}

    .download-page-main .page-section{padding:78px 0}
    .download-page-main .soft-section{background:var(--surface)}
    .download-page-main .section-head{max-width:720px;margin:0 auto 36px;text-align:center}
    .download-page-main .section-kicker{display:block;margin-bottom:8px;color:var(--brand);font-size:13px;font-weight:900;letter-spacing:2px}
    .download-page-main .section-head h2{margin:0 0 12px;font-size:clamp(28px,4vw,42px);line-height:1.2}
    .download-page-main .section-head p{margin:0;color:var(--muted)}
    .download-page-main .download-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
    .download-page-main .download-card{position:relative;display:flex;flex-direction:column;min-height:330px;padding:28px;border:2px solid var(--ink);border-radius:18px;background:#fff;box-shadow:7px 7px 0 var(--ink)}
    .download-page-main .download-card:nth-child(2){background:#e8f0ff;transform:translateY(14px)}
    .download-page-main .download-card:nth-child(3){background:#fff3c4}
    .download-page-main .software-icon{width:62px;height:62px;display:grid;place-items:center;margin-bottom:24px;border:2px solid var(--ink);border-radius:16px;background:#fff;font-size:28px;font-weight:900}
    .download-page-main .download-card h3{margin:0 0 10px;font-size:22px}
    .download-page-main .download-card p{margin:0 0 18px;color:var(--muted)}
    .download-page-main .feature-list{margin:0 0 24px;padding:0;list-style:none}
    .download-page-main .feature-list li{position:relative;margin:8px 0;padding-left:22px;font-size:14px}
    .download-page-main .feature-list li::before{content:"✓";position:absolute;left:0;color:var(--green);font-weight:900}
    .download-page-main .card-link{margin-top:auto;display:flex;align-items:center;justify-content:space-between;padding-top:16px;border-top:1px solid rgba(16,24,40,.18);color:var(--brand);font-weight:900}
    .download-page-main .card-link::after{content:"→";font-size:20px}

    .download-page-main .safety-panel{display:grid;grid-template-columns:.85fr 1.15fr;gap:46px;align-items:center;padding:44px;border:2px solid var(--ink);border-radius:24px;background:var(--brand);color:#fff;box-shadow:10px 10px 0 var(--accent)}
    .download-page-main .shield-visual{position:relative;min-height:260px;display:grid;place-items:center;border:1px solid rgba(255,255,255,.24);border-radius:20px;background:radial-gradient(circle,rgba(255,255,255,.18),transparent 65%)}
    .download-page-main .shield-icon{width:150px;height:180px;display:grid;place-items:center;background:#fff;color:var(--brand);font-size:65px;font-weight:900;clip-path:polygon(50% 0,95% 16%,88% 74%,50% 100%,12% 74%,5% 16%)}
    .download-page-main .safety-copy h2{margin:0 0 14px;font-size:36px;line-height:1.2}
    .download-page-main .safety-copy>p{margin:0 0 24px;color:#dbe7ff}
    .download-page-main .safety-points{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}
    .download-page-main .safety-point{padding:14px;border:1px solid rgba(255,255,255,.26);border-radius:12px;background:rgba(255,255,255,.08)}
    .download-page-main .safety-point strong{display:block;margin-bottom:3px}
    .download-page-main .safety-point span{color:#dbe7ff;font-size:13px}

    .download-page-main .step-list{max-width:940px;margin:auto;counter-reset:install}
    .download-page-main .step-item{counter-increment:install;display:grid;grid-template-columns:92px 1fr;gap:25px;align-items:start;padding:25px 0;border-bottom:1px solid var(--line)}
    .download-page-main .step-item::before{content:"0" counter(install);display:grid;place-items:center;width:76px;height:76px;border:2px solid var(--ink);border-radius:50%;background:var(--accent);font-size:22px;font-weight:900;box-shadow:4px 4px 0 var(--ink)}
    .download-page-main .step-item h3{margin:4px 0 7px;font-size:21px}
    .download-page-main .step-item p{margin:0;color:var(--muted)}
    .download-page-main .requirements{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-top:38px}
    .download-page-main .requirement-card{padding:22px;border:1px solid var(--line);border-radius:15px;background:#fff}
    .download-page-main .requirement-card h3{margin:0 0 7px;font-size:17px}
    .download-page-main .requirement-card p{margin:0;color:var(--muted);font-size:14px}

    .download-page-main .faq-list{max-width:900px;margin:auto}
    .download-page-main .faq-item{margin-bottom:12px;border:1px solid var(--line);border-radius:14px;background:#fff;overflow:hidden}
    .download-page-main .faq-item[open]{border-color:#a9bee7;box-shadow:0 10px 28px rgba(11,61,145,.08)}
    .download-page-main .faq-item summary{position:relative;padding:19px 55px 19px 21px;cursor:pointer;font-weight:900;list-style:none}
    .download-page-main .faq-item summary::-webkit-details-marker{display:none}
    .download-page-main .faq-item summary::after{content:"+";position:absolute;right:20px;top:15px;color:var(--brand);font-size:25px}
    .download-page-main .faq-item[open] summary::after{content:"−"}
    .download-page-main .faq-answer{padding:0 21px 21px;color:var(--muted)}
    .download-page-main .faq-answer p{margin:0}
    .download-page-main .final-cta{padding:76px 0;background:#fff}
    .download-page-main .cta-box{position:relative;overflow:hidden;padding:52px 30px;border:2px solid var(--ink);border-radius:24px;background:var(--accent);text-align:center;box-shadow:9px 9px 0 var(--ink)}
    .download-page-main .cta-box::before{content:"";position:absolute;left:-55px;top:-60px;width:180px;height:180px;border:24px solid #fff;border-radius:50%;opacity:.45}
    .download-page-main .cta-box h2{position:relative;margin:0 0 12px;font-size:clamp(30px,4vw,44px)}
    .download-page-main .cta-box p{position:relative;max-width:680px;margin:0 auto 25px}
    .download-page-main .cta-box .primary-action{position:relative}

    .footer{padding:62px 0 20px;background:#081a38;color:#cbd6e8}
    .footer-grid{display:grid;grid-template-columns:1.45fr 1fr 1fr 1fr;gap:42px}
    .footer-brand{display:inline-block;margin-bottom:12px;color:#fff;font-size:23px;font-weight:900}
    .footer p{margin:7px 0;color:#aebbd0;font-size:14px}
    .footer h3{margin:0 0 15px;color:#fff;font-size:16px}
    .footer-grid>div>a:not(.footer-brand){display:block;margin:9px 0;color:#cbd6e8;font-size:14px}
    .footer-grid>div>a:hover{color:#fff}
    .footer-bottom{margin-top:40px;padding-top:20px;border-top:1px solid rgba(255,255,255,.14);color:#96a6bf;font-size:13px;text-align:center}

    @media (max-width:1080px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-inner{min-height:70px}
      .header-btns{margin-left:auto}
      .download-page-main .download-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
      .download-page-main .download-card:nth-child(2){transform:none}
      .download-page-main .download-card:last-child{grid-column:1/-1}
      .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:2px}
      .topbar a{margin:0 14px 0 0}
      .logo span{max-width:145px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
      .member-btn{display:none}
      .open-btn{min-height:38px;padding:0 12px}
      .download-page-main .download-intro{padding:62px 0 58px}
      .download-page-main h1{letter-spacing:-1px}
      .download-page-main .intro-copy{font-size:16px}
      .download-page-main .page-section{padding:58px 0}
      .download-page-main .download-grid{grid-template-columns:1fr}
      .download-page-main .download-card:last-child{grid-column:auto}
      .download-page-main .safety-panel{grid-template-columns:1fr;padding:25px;gap:26px}
      .download-page-main .shield-visual{min-height:210px}
      .download-page-main .shield-icon{width:120px;height:145px;font-size:50px}
      .download-page-main .safety-copy h2{font-size:30px}
      .download-page-main .step-item{grid-template-columns:65px 1fr;gap:14px}
      .download-page-main .step-item::before{width:58px;height:58px;font-size:18px;box-shadow:3px 3px 0 var(--ink)}
      .download-page-main .requirements{grid-template-columns:1fr}
      .footer-grid{grid-template-columns:1fr;gap:28px}
    }
    @media (max-width:480px){
      .logo img{width:36px;height:36px}
      .open-btn{display:none}
      .download-page-main .intro-actions{flex-direction:column}
      .download-page-main .primary-action,.download-page-main .secondary-action{width:100%}
      .download-page-main .download-card{padding:23px;box-shadow:5px 5px 0 var(--ink)}
      .download-page-main .safety-points{grid-template-columns:1fr}
      .download-page-main .cta-box{padding:42px 20px}
    }