:root{
      --theme:#0B3D91;
      --theme-dark:#082b66;
      --theme-light:#eaf2ff;
      --ink:#172033;
      --muted:#667085;
      --line:#e5eaf1;
      --paper:#f7f9fc;
      --white:#fff;
      --shadow:0 18px 50px rgba(17,39,78,.10);
      --radius:18px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:var(--paper);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.7}
    body.drawer-locked{overflow:hidden}
    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{background:#071c3e;color:#dce8ff;font-size:13px}
    .topbar-inner{height:38px;display:flex;align-items:center;justify-content:space-between}
    .topbar-contact{display:flex;gap:22px}
    .topbar a{color:#dce8ff;transition:color .2s}
    .topbar a:hover{color:#fff}

    .header{position:relative;z-index:30;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{min-height:78px;display:flex;align-items:center;gap:30px}
    .logo{display:inline-flex;align-items:center;gap:10px;font-size:19px;font-weight:800;color:var(--theme);white-space:nowrap}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{margin-left:auto}
    .nav-list{list-style:none;margin:0;padding:0;display:flex;align-items:stretch;gap:3px}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:6px;padding:27px 13px;font-size:14px;font-weight:700;white-space:nowrap}
    .nav-link:hover,.nav-item:focus-within>.nav-link{color:var(--theme)}
    .has-arrow:after{content:"";width:6px;height:6px;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:50%;transform:translateX(-50%) translateY(8px);visibility:hidden;opacity:0;pointer-events:none;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);transition:.2s ease}
    .dropdown-panel{width:280px;padding:12px;border-radius:0 0 14px 14px}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-14px;height:14px}
    .dropdown-panel a{display:block;padding:10px 12px;border-radius:8px;font-size:14px}
    .dropdown-panel a:hover{background:var(--theme-light);color:var(--theme)}
    .dropdown-footer,.mega-footer{color:var(--theme);font-weight:700!important;border-top:1px solid var(--line);margin-top:7px;border-radius:0!important}
    .nav-item:hover>.dropdown-panel,.nav-item:focus-within>.dropdown-panel,
    .nav-item:hover>.mega-menu,.nav-item:focus-within>.mega-menu{visibility:visible;opacity:1;pointer-events:auto;transform:translateX(-50%) translateY(0)}
    .mega-menu{width:min(850px,calc(100vw - 32px));padding:22px;border-radius:0 0 18px 18px}
    .mega-title-row{display:flex;justify-content:space-between;align-items:center;gap:20px;padding-bottom:15px;border-bottom:1px solid var(--line)}
    .mega-title-row strong{font-size:17px;color:var(--ink)}
    .mega-title-row span{color:var(--muted);font-size:13px}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:16px}
    .mega-card{display:block;padding:13px;border:1px solid var(--line);border-radius:12px;transition:.2s;background:#fff}
    .mega-card:hover{border-color:#9ab7ec;box-shadow:0 8px 18px rgba(11,61,145,.09);transform:translateY(-2px)}
    .mega-card-head{display:flex;align-items:center;gap:10px}
    .mega-card-head img{width:34px;height:34px;object-fit:contain;border-radius:8px}
    .mega-card strong{font-size:14px}
    .mega-card p{font-size:12px;color:var(--muted);margin:8px 0 0;line-height:1.5}
    .mega-meta{display:flex;gap:8px;flex-wrap:wrap;margin-top:9px;color:var(--muted);font-size:11px}
    .rating{display:block;font-size:11px;color:#d58b16;font-weight:700}
    .category-links{display:flex;flex-wrap:wrap;gap:8px;margin-top:15px}
    .category-links a{font-size:12px;color:var(--theme);background:var(--theme-light);border-radius:99px;padding:4px 10px}
    .video-card>img,.product-card>img{width:100%;height:70px;object-fit:cover;border-radius:8px;margin-bottom:8px}
    .header-btns{display:flex;align-items:center;gap:12px}
    .member-entry{font-size:14px;font-weight:700;color:var(--theme)}
    .account-entry{color:#fff;background:var(--theme);padding:9px 16px;border-radius:8px;font-size:13px;font-weight:700}
    .account-entry:hover{background:var(--theme-dark)}
    .hamburger{display:none;border:0;background:transparent;padding:8px;cursor:pointer}
    .hamburger span{display:block;width:23px;height:2px;background:var(--ink);margin:5px 0;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;background:rgba(2,13,31,.5);opacity:0;visibility:hidden;z-index:80;transition:.25s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;right:0;top:0;bottom:0;width:min(390px,88vw);background:#fff;z-index:90;transform:translateX(100%);transition:transform .28s ease;overflow:auto;box-shadow:-10px 0 35px rgba(0,0,0,.18)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{height:72px;display:flex;align-items:center;gap:16px;padding:0 20px;border-bottom:1px solid var(--line);font-weight:800;color:var(--theme)}
    .drawer-head>a{margin-left:auto;background:var(--theme);color:#fff;padding:6px 13px;border-radius:7px;font-size:13px}
    .drawer-close{border:0;background:transparent;font-size:30px;line-height:1;cursor:pointer;color:var(--muted)}
    .drawer-menu{padding:12px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid var(--line);background:transparent;text-align:left;font-weight:700;color:var(--ink);cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:20px;font-weight:400}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{max-height:0;overflow:hidden;transition:max-height .25s ease;background:#f5f8fd;border-radius:8px}
    .drawer-submenu.open{max-height:600px;margin:7px 0}
    .drawer-submenu a{display:block;padding:9px 13px;font-size:13px;color:var(--muted)}
    .drawer-submenu a:hover{color:var(--theme)}

    .download-page-main{padding-bottom:80px}
    .download-hero{position:relative;overflow:hidden;background:linear-gradient(135deg,#071c3e 0%,#0B3D91 58%,#2867c7 100%);color:#fff;padding:78px 0 100px}
    .download-hero:before{content:"";position:absolute;width:480px;height:480px;border:1px solid rgba(255,255,255,.14);border-radius:50%;right:-90px;top:-220px;box-shadow:0 0 0 48px rgba(255,255,255,.035),0 0 0 96px rgba(255,255,255,.025)}
    .download-hero:after{content:"";position:absolute;left:-160px;bottom:-270px;width:520px;height:520px;border-radius:50%;background:rgba(79,151,255,.17)}
    .download-hero-inner{position:relative;z-index:1;text-align:center}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:6px 13px;border:1px solid rgba(255,255,255,.3);border-radius:99px;color:#dceaff;font-size:13px;margin-bottom:18px}
    .eyebrow:before{content:"";width:7px;height:7px;border-radius:50%;background:#77b2ff;box-shadow:0 0 0 5px rgba(119,178,255,.18)}
    .download-hero h1{font-size:clamp(32px,5vw,58px);line-height:1.15;margin:0 auto 18px;letter-spacing:-1px}
    .download-hero p{max-width:650px;margin:0 auto;color:#dbe9ff;font-size:16px}
    .download-actions{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin-top:28px}
    .btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 21px;border-radius:9px;font-weight:700;font-size:14px;border:1px solid transparent;cursor:pointer}
    .btn-primary{background:#fff;color:var(--theme)}
    .btn-primary:hover{background:#eaf2ff}
    .btn-ghost{border-color:rgba(255,255,255,.45);color:#fff}
    .btn-ghost:hover{background:rgba(255,255,255,.1)}
    .download-summary{position:relative;z-index:2;margin-top:-45px}
    .summary-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .summary-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:var(--shadow)}
    .summary-card strong{display:block;color:var(--theme);font-size:25px;line-height:1.2}
    .summary-card span{font-size:13px;color:var(--muted)}

    .download-section{padding:72px 0 0}
    .section-heading{text-align:center;max-width:680px;margin:0 auto 35px}
    .section-heading h2{font-size:30px;margin:0 0 10px;line-height:1.3}
    .section-heading p{margin:0;color:var(--muted);font-size:15px}
    .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
    .step-card{position:relative;background:#fff;border:1px solid var(--line);border-radius:16px;padding:25px 20px;min-height:190px}
    .step-number{display:flex;width:38px;height:38px;align-items:center;justify-content:center;border-radius:11px;background:var(--theme-light);color:var(--theme);font-weight:800;margin-bottom:18px}
    .step-card h3{font-size:17px;margin:0 0 8px}
    .step-card p{font-size:13px;color:var(--muted);margin:0}
    .step-card:not(:last-child):after{content:"";position:absolute;right:-18px;top:44px;width:18px;height:1px;background:#b9cbea}
    .platform-section{padding:75px 0 0}
    .platform-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .platform-card{background:#fff;border:1px solid var(--line);border-radius:17px;padding:25px;display:flex;flex-direction:column;min-height:245px;transition:.2s}
    .platform-card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
    .platform-icon{width:48px;height:48px;border-radius:13px;background:var(--theme-light);color:var(--theme);display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:800;margin-bottom:16px}
    .platform-card h3{margin:0 0 7px;font-size:18px}
    .platform-card p{margin:0;color:var(--muted);font-size:13px}
    .platform-card .btn{margin-top:auto;align-self:flex-start;min-height:38px;padding:0 15px;font-size:13px}
    .btn-blue{background:var(--theme);color:#fff}
    .btn-blue:hover{background:var(--theme-dark)}
    .download-note{margin-top:42px;background:#edf4ff;border-left:4px solid var(--theme);border-radius:10px;padding:17px 20px;color:#385176;font-size:13px}
    .faq-section{padding:76px 0 0}
    .faq-list{max-width:850px;margin:auto;border-top:1px solid var(--line)}
    .faq-item{background:#fff;border-bottom:1px solid var(--line)}
    .faq-question{width:100%;border:0;background:transparent;text-align:left;padding:19px 4px;font-weight:700;color:var(--ink);cursor:pointer;display:flex;justify-content:space-between;align-items:center}
    .faq-question:after{content:"+";color:var(--theme);font-size:22px;font-weight:400}
    .faq-question.active:after{content:"−"}
    .faq-answer{max-height:0;overflow:hidden;transition:max-height .25s ease;color:var(--muted);font-size:14px}
    .faq-answer.open{max-height:180px}
    .faq-answer p{margin:0 35px 18px 4px}
    .download-cta{margin-top:75px;border-radius:20px;background:linear-gradient(120deg,var(--theme-dark),var(--theme));color:#fff;padding:40px;text-align:center}
    .download-cta h2{margin:0 0 9px;font-size:27px}
    .download-cta p{margin:0;color:#dce8ff;font-size:14px}
    .download-cta .btn{margin-top:21px}

    .footer{background:#091b39;color:#c8d4e8;margin-top:80px;padding:55px 0 20px}
    .footer .logo{color:#fff}
    .footer .logo img{background:#fff;border-radius:8px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:35px}
    .footer-brand p{font-size:13px;line-height:1.8;color:#9fb0cb;max-width:310px;margin-top:17px}
    .footer h3{font-size:15px;color:#fff;margin:4px 0 16px}
    .footer-links{display:flex;flex-direction:column;gap:9px;font-size:13px}
    .footer-links a,.footer-contact a{color:#aebdd3}
    .footer-links a:hover,.footer-contact a:hover{color:#fff}
    .footer-contact{display:flex;flex-direction:column;gap:10px;font-size:13px;color:#aebdd3}
    .social-entry{color:#82b5ff!important;font-weight:700}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid rgba(255,255,255,.12);margin-top:40px;padding-top:19px;color:#8294b1;font-size:12px}
    .risk-note{text-align:right;max-width:560px}

    @media (max-width:980px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-btns{margin-left:auto}
      .mega-grid{grid-template-columns:repeat(2,1fr)}
      .steps{grid-template-columns:repeat(2,1fr)}
      .step-card:nth-child(2):after{display:none}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media (max-width:640px){
      .container{width:min(100% - 28px,1180px)}
      .topbar-inner{height:auto;min-height:38px;padding:7px 0;align-items:flex-start;gap:7px}
      .topbar-contact{gap:7px;flex-direction:column;text-align:right}
      .logo span{font-size:16px}
      .header-inner{min-height:66px;gap:10px}
      .member-entry{display:none}
      .account-entry{padding:8px 11px;font-size:12px}
      .download-hero{padding:58px 0 82px}
      .download-hero h1{font-size:34px}
      .download-hero p{font-size:14px}
      .summary-grid,.platform-grid,.steps{grid-template-columns:1fr}
      .summary-card{text-align:center}
      .step-card:not(:last-child):after{display:none}
      .section-heading h2{font-size:25px}
      .download-section,.platform-section,.faq-section{padding-top:53px}
      .footer-grid{grid-template-columns:1fr;gap:25px}
      .footer-bottom{flex-direction:column}
      .risk-note{text-align:left}
      .mega-grid{grid-template-columns:1fr}
    }