:root{
      --theme:#0B3D91;
      --ink:#14233b;
      --muted:#64748b;
      --line:#dce5f0;
      --soft:#f4f7fb;
      --white:#fff;
      --accent:#f0b429;
      --shadow:0 18px 50px rgba(20,35,59,.10);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f7f9fc;font-family:"PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.65}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block}
    button{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:auto}
    .topbar{background:#0e1d36;color:#dbe6f5;font-size:13px}
    .topbar-inner{min-height:36px;display:flex;align-items:center;justify-content:space-between}
    .topbar-links{display:flex;gap:22px}
    .topbar a{color:#dbe6f5}
    .header{height:78px;background:#fff;border-bottom:1px solid var(--line);position:relative;z-index:20}
    .header-inner{height:100%;display:flex;align-items:center;gap:35px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;font-size:19px;font-weight:800;color:var(--theme)}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{list-style:none;padding:0;margin:0;display:flex;align-items:stretch;justify-content:center;gap:4px}
    .nav-item{position:relative}
    .nav-link{height:78px;padding:0 15px;display:flex;align-items:center;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"";width:6px;height:6px;margin:0 0 4px 8px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg)}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%);background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);opacity:0;visibility:hidden;pointer-events:none;transition:.2s;z-index:30}
    .dropdown-panel{width:270px;padding:20px}
    .mega-menu{width:min(760px,90vw);padding:25px}
    .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;pointer-events:auto}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;top:-14px;left:0;right:0;height:14px}
    .dropdown-title,.mega-title{margin:0 0 13px;color:var(--theme);font-size:14px;font-weight:800}
    .dropdown-list,.mega-links{display:grid;gap:9px}
    .dropdown-list a,.mega-links a{font-size:13px;color:#43536b}
    .dropdown-list a:hover,.mega-links a:hover{color:var(--theme)}
    .mega-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}
    .mega-cards{display:grid;grid-template-columns:1fr 1fr;gap:10px}
    .mega-card{display:flex;gap:9px;padding:9px;border:1px solid #e5ebf3;border-radius:9px;background:#fbfdff;min-width:0}
    .mega-card img{width:35px;height:35px;object-fit:cover;border-radius:6px;background:#e9eff8;flex:none}
    .mega-card span{min-width:0;display:grid;gap:1px}
    .mega-card strong{font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .mega-card span span{font-size:10px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .mega-footer{display:inline-block;margin-top:19px;padding-top:13px;border-top:1px solid var(--line);width:100%;font-size:13px;color:var(--theme);font-weight:700}
    .header-btns{display:flex;align-items:center;gap:11px;white-space:nowrap}
    .member-link{font-size:13px;color:var(--theme);font-weight:700}
    .account-link{padding:9px 15px;background:var(--theme);border-radius:7px;color:#fff;font-size:13px;font-weight:700}
    .hamburger{display:none;width:42px;height:40px;padding:9px;border:1px solid var(--line);background:#fff;border-radius:7px;cursor:pointer}
    .hamburger span{height:2px;background:var(--theme);display:block;margin:5px 0;transition:.2s}
    .hamburger.active span:first-child{transform:translateY(7px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:last-child{transform:translateY(-7px) rotate(-45deg)}
    .drawer-overlay{position:fixed;inset:0;background:rgba(8,20,40,.5);opacity:0;visibility:hidden;z-index:40;transition:.2s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:0;width:min(370px,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:800;color:var(--theme)}
    .drawer-head a{margin-left:auto;background:var(--theme);color:#fff;padding:6px 12px;border-radius:5px;font-size:13px}
    .drawer-close{border:0;background:transparent;font-size:28px;color:#64748b;cursor:pointer}
    .drawer-menu{padding:10px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid #edf1f6;background:transparent;text-align:left;color:var(--ink);font-weight:700;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:20px;line-height:20px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:6px 0 8px 15px}
    .drawer-submenu.open{display:grid;gap:8px}
    .drawer-submenu a{font-size:13px;color:var(--muted)}
    .footer{margin-top:70px;background:#0e1d36;color:#dbe6f5;padding:55px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:35px}
    .footer-brand strong{font-size:20px;color:#fff}
    .footer-brand p{max-width:300px;color:#aebed4;font-size:13px}
    .footer h3{margin:0 0 15px;font-size:14px;color:#fff}
    .footer-links{display:grid;gap:8px;font-size:13px;color:#aebed4}
    .footer-links a:hover{color:#fff}
    .footer-bottom{border-top:1px solid rgba(255,255,255,.13);margin-top:38px;padding-top:17px;display:flex;justify-content:space-between;gap:20px;color:#91a4bf;font-size:12px}

    .download-page-main{padding:0 0 20px}
    .download-hero{background:linear-gradient(135deg,#eef4ff 0%,#fff 58%,#f9f2dc 100%);padding:74px 0 68px;border-bottom:1px solid var(--line);text-align:center}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border:1px solid #cbdaf1;border-radius:30px;color:var(--theme);background:#fff;font-size:12px;font-weight:800}
    .eyebrow:before{content:"";width:7px;height:7px;background:#31b875;border-radius:50%;box-shadow:0 0 0 4px #d8f3e5}
    .download-hero h1{margin:20px 0 12px;font-size:clamp(34px,5vw,58px);letter-spacing:-1.5px;line-height:1.18}
    .download-hero p{max-width:650px;margin:0 auto;color:var(--muted);font-size:16px}
    .download-actions{display:flex;justify-content:center;gap:12px;margin-top:27px;flex-wrap:wrap}
    .primary-btn,.secondary-btn{display:inline-flex;align-items:center;justify-content:center;border-radius:7px;padding:12px 21px;font-size:14px;font-weight:800}
    .primary-btn{background:var(--theme);color:#fff;box-shadow:0 8px 18px rgba(11,61,145,.2)}
    .secondary-btn{background:#fff;color:var(--theme);border:1px solid #bfd0ea}
    .download-content{padding:56px 0}
    .section-heading{text-align:center;margin-bottom:28px}
    .section-heading h2{font-size:29px;margin:0 0 7px}
    .section-heading p{margin:0;color:var(--muted);font-size:14px}
    .download-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
    .download-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:28px 25px;box-shadow:0 8px 25px rgba(20,35,59,.05)}
    .download-icon{width:48px;height:48px;display:grid;place-items:center;border-radius:12px;background:#eaf1ff;color:var(--theme);font-size:23px;font-weight:900}
    .download-card h3{margin:18px 0 6px;font-size:19px}
    .download-card p{margin:0 0 18px;color:var(--muted);font-size:13px;min-height:44px}
    .download-card .secondary-btn{padding:9px 15px;font-size:13px}
    .version{display:block;color:#94a3b8;font-size:11px;margin-top:12px}
    .steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:42px}
    .step{position:relative;background:#fff;border:1px solid var(--line);border-radius:12px;padding:23px}
    .step-number{color:var(--accent);font-size:27px;font-weight:900}
    .step h3{font-size:16px;margin:8px 0 5px}
    .step p{margin:0;color:var(--muted);font-size:13px}
    .faq-wrap{margin-top:50px;display:grid;grid-template-columns:.8fr 1.2fr;gap:35px;align-items:start}
    .faq-intro{background:var(--theme);color:#fff;border-radius:14px;padding:30px}
    .faq-intro h2{margin:0 0 10px;font-size:25px}
    .faq-intro p{color:#cfddf4;font-size:13px;margin:0}
    .faq-list{display:grid;gap:10px}
    .faq-list details{background:#fff;border:1px solid var(--line);border-radius:9px;padding:15px 18px}
    .faq-list summary{cursor:pointer;font-weight:700;font-size:14px}
    .faq-list p{color:var(--muted);font-size:13px;margin:10px 0 0}

    @media(max-width:980px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-btns{margin-left:auto}
      .mega-grid{grid-template-columns:1fr}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media(max-width:700px){
      .container{width:min(100% - 28px,1180px)}
      .topbar-inner{padding:7px 0;display:block;text-align:center}
      .topbar-links{justify-content:center;margin-top:2px;gap:12px;font-size:11px}
      .header{height:68px}
      .logo{min-width:0;font-size:16px}
      .logo img{width:32px;height:32px}
      .member-link{display:none}
      .account-link{padding:8px 11px}
      .download-hero{padding:52px 0}
      .download-hero h1{font-size:36px}
      .download-hero p{font-size:14px}
      .download-cards,.steps{grid-template-columns:1fr}
      .download-card p{min-height:0}
      .faq-wrap{grid-template-columns:1fr;margin-top:35px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:25px}
      .footer-bottom{display:block}
      .footer-bottom span{display:block;margin-top:5px}
    }
    @media(max-width:430px){
      .footer-grid{grid-template-columns:1fr}
      .mega-cards{grid-template-columns:1fr}
    }