:root{
      --primary:#0B3D91;
      --primary-dark:#072b68;
      --primary-soft:#e9f1ff;
      --ink:#172338;
      --muted:#697589;
      --line:#dfe6ef;
      --paper:#f7f9fc;
      --white:#fff;
      --orange:#f28b30;
      --shadow:0 18px 50px rgba(15,43,83,.10);
      --radius:18px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:var(--paper);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","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%;height:auto;display:block}
    button{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .skip-link{position:absolute;left:-9999px;top:8px;z-index:1000;background:var(--primary);color:#fff;padding:8px 14px;border-radius:6px}
    .skip-link:focus{left:15px}
    .topbar{background:#071a38;color:#cbd8ec;font-size:13px}
    .topbar-inner{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:18px}
    .topbar-contact{display:flex;gap:20px}
    .topbar a:hover{color:#fff}
    .header{position:relative;z-index:30;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:78px;display:flex;align-items:center;gap:34px}
    .logo{display:inline-flex;align-items:center;gap:10px;min-width:max-content;font-size:19px;font-weight:800;color:var(--primary)}
    .logo img{width:34px;height:34px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:center;justify-content:center;gap:4px;list-style:none;margin:0;padding:0}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:6px;padding:27px 14px;font-size:14px;font-weight:650;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--primary)}
    .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:calc(100% - 1px);left:50%;transform:translate(-50%,10px);width:300px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:var(--shadow);opacity:0;visibility:hidden;pointer-events:none;transition:.2s ease}
    .mega-menu{width:min(760px,calc(100vw - 34px));padding:24px}
    .nav-item:after{content:"";position:absolute;left:0;right:0;bottom:-5px;height:8px}
    .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;transform:translate(-50%,0)}
    .dropdown-title,.mega-heading{display:flex;flex-direction:column;gap:3px;margin-bottom:14px}
    .dropdown-title,.mega-heading strong{font-size:16px;color:var(--primary)}
    .mega-heading span{font-size:12px;color:var(--muted)}
    .dropdown-article{display:block;padding:9px 0;border-bottom:1px solid var(--line);font-size:13px}
    .dropdown-article:hover,.dropdown-more:hover{color:var(--primary)}
    .dropdown-more,.mega-footer{display:block;margin-top:14px;color:var(--primary);font-size:13px;font-weight:700}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
    .mega-card{display:flex;gap:9px;min-width:0;padding:10px;border:1px solid var(--line);border-radius:10px;background:#fbfcff}
    .mega-card:hover{border-color:#9bb8e8;background:var(--primary-soft)}
    .mega-card>img{width:38px;height:38px;object-fit:contain;border-radius:6px;flex:none}
    .mega-card-content{min-width:0;display:flex;flex-direction:column;gap:3px}
    .mega-card-content strong{font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .mega-card-content p{margin:0;color:var(--muted);font-size:11px;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
    .mega-card-meta{display:flex;flex-wrap:wrap;gap:4px 8px;color:var(--muted);font-size:10px}
    .mega-categories{display:flex;flex-wrap:wrap;gap:7px;margin:-2px 0 15px}
    .mega-categories a{padding:5px 10px;background:var(--primary-soft);color:var(--primary);font-size:12px;border-radius:99px}
    .header-btns{display:flex;align-items:center;gap:12px;white-space:nowrap}
    .header-btns>a:not(.logo){padding:9px 15px;border-radius:8px;background:var(--primary);color:#fff;font-size:13px;font-weight:700}
    .header-btns>a:not(.logo):hover{background:var(--primary-dark)}
    .hamburger{display:none;width:42px;height:40px;padding:8px;border:1px solid var(--line);border-radius:8px;background:#fff;cursor:pointer}
    .hamburger span{display:block;width:22px;height:2px;margin:5px auto;background:var(--primary);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(4,17,38,.52);z-index:80;opacity:0;visibility:hidden;transition:.25s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;right:0;top:0;width:min(380px,88vw);height:100vh;z-index:90;background:#fff;transform:translateX(100%);transition:.28s ease;overflow:auto;box-shadow:-10px 0 35px rgba(0,0,0,.16)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:12px;padding:19px 20px;border-bottom:1px solid var(--line);color:var(--primary);font-weight:700}
    .drawer-head>a{margin-left:auto;padding:6px 12px;border-radius:6px;background:var(--primary);color:#fff;font-size:13px}
    .drawer-close{border:0;background:none;color:var(--muted);font-size:28px;line-height:1;cursor:pointer}
    .drawer-menu{padding:10px 20px 35px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid var(--line);background:none;text-align:left;color:var(--ink);font-size:15px;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--primary);font-size:20px;line-height:1}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:4px 0 8px 14px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:13px}
    .drawer-submenu a:hover{color:var(--primary)}
    .footer{margin-top:70px;background:#071a38;color:#b9c8dd}
    .footer-main{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:42px;padding:52px 0 42px}
    .footer .logo{color:#fff;margin-bottom:17px}
    .footer-brand p{max-width:320px;margin:0;color:#9fb0c8;font-size:13px;line-height:1.9}
    .footer h3{margin:3px 0 16px;color:#fff;font-size:15px}
    .footer-links,.footer-contact{display:flex;flex-direction:column;gap:9px;font-size:13px}
    .footer-links a:hover,.footer-contact a:hover{color:#fff}
    .footer-social{display:flex;flex-direction:column;gap:4px;margin-top:8px}
    .footer-social strong{color:#fff;font-size:13px;font-weight:600}
    .footer-social span{word-break:break-all}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;padding:18px 0;border-top:1px solid rgba(255,255,255,.14);font-size:12px;color:#8ea2bf}
    .footer-bottom-links{display:flex;gap:18px}
    .download-page-main{padding:0 0 10px}
    .download-hero{position:relative;overflow:hidden;padding:78px 0 76px;background:linear-gradient(135deg,#edf4ff 0%,#fff 58%,#fff4e8 100%)}
    .download-hero:before,.download-hero:after{content:"";position:absolute;border-radius:50%;pointer-events:none}
    .download-hero:before{width:430px;height:430px;right:-140px;top:-180px;background:rgba(11,61,145,.08)}
    .download-hero:after{width:260px;height:260px;left:-120px;bottom:-160px;background:rgba(242,139,48,.10)}
    .download-hero-inner{position:relative;z-index:1;text-align:center}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;margin-bottom:17px;color:var(--primary);font-size:13px;font-weight:800;letter-spacing:.08em}
    .eyebrow:before{content:"";width:26px;height:2px;background:var(--orange)}
    .download-hero h1{max-width:760px;margin:0 auto 18px;font-size:clamp(32px,5vw,56px);line-height:1.2;letter-spacing:-.04em;color:#102d59}
    .download-hero p{max-width:660px;margin:0 auto;color:var(--muted);font-size:16px}
    .download-actions{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:30px}
    .button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 23px;border-radius:9px;border:1px solid var(--primary);font-size:14px;font-weight:750;cursor:pointer}
    .button-primary{background:var(--primary);color:#fff}
    .button-primary:hover{background:var(--primary-dark)}
    .button-light{background:#fff;color:var(--primary)}
    .button-light:hover{background:var(--primary-soft)}
    .download-trust{display:flex;justify-content:center;flex-wrap:wrap;gap:20px;margin-top:27px;color:#718098;font-size:12px}
    .download-trust span{display:inline-flex;align-items:center;gap:6px}
    .download-trust span:before{content:"✓";display:inline-grid;place-items:center;width:17px;height:17px;border-radius:50%;background:#dff2e9;color:#218452;font-weight:800}
    .download-section{padding:76px 0 0}
    .section-heading{text-align:center;max-width:680px;margin:0 auto 35px}
    .section-heading h2{margin:0 0 10px;font-size:30px;line-height:1.3;color:#132b50}
    .section-heading p{margin:0;color:var(--muted);font-size:14px}
    .download-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .step-card{position:relative;padding:27px 22px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 25px rgba(18,51,95,.05)}
    .step-card:not(:last-child):after{content:"→";position:absolute;right:-22px;top:47px;color:#9bb1d0;font-size:25px;z-index:2}
    .step-number{display:grid;place-items:center;width:38px;height:38px;margin-bottom:18px;border-radius:11px;background:var(--primary);color:#fff;font-weight:800}
    .step-card h3{margin:0 0 8px;font-size:17px;color:#173a70}
    .step-card p{margin:0;color:var(--muted);font-size:13px;line-height:1.8}
    .platform-panel{display:grid;grid-template-columns:1.1fr 1fr;gap:20px;align-items:stretch}
    .platform-card{padding:31px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
    .platform-card.primary-card{background:linear-gradient(145deg,#0b3d91,#1555b4);color:#fff;border:0}
    .platform-card h3{margin:0 0 9px;font-size:22px}
    .platform-card p{margin:0 0 21px;color:var(--muted);font-size:14px}
    .primary-card p{color:#d9e7ff}
    .platform-points{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:22px 0 25px}
    .platform-point{padding:12px;border-radius:10px;background:rgba(255,255,255,.12);font-size:13px}
    .platform-card:not(.primary-card) .platform-point{background:var(--primary-soft);color:#284b7c}
    .platform-point strong{display:block;margin-bottom:3px;font-size:14px}
    .platform-point span{color:inherit;opacity:.78;font-size:12px}
    .faq-list{max-width:820px;margin:0 auto;display:grid;gap:10px}
    .faq-item{background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}
    .faq-question{width:100%;padding:18px 20px;border:0;background:#fff;color:var(--ink);text-align:left;font-weight:700;cursor:pointer}
    .faq-question:after{content:"+";float:right;color:var(--primary);font-size:20px;line-height:1}
    .faq-question.active:after{content:"−"}
    .faq-answer{display:none;padding:0 20px 18px;color:var(--muted);font-size:14px}
    .faq-answer.open{display:block}
    .download-note{max-width:820px;margin:42px auto 0;padding:19px 22px;border-left:4px solid var(--orange);background:#fff8ef;color:#79532e;font-size:13px;border-radius:0 10px 10px 0}
    @media(max-width:1050px){
      .header-inner{gap:18px}
      .nav-link{padding-left:9px;padding-right:9px}
      .footer-main{gap:25px}
    }
    @media(max-width:820px){
      .container{width:min(100% - 30px,680px)}
      .topbar-inner{padding:7px 0;align-items:flex-start}
      .topbar-contact{gap:10px;flex-direction:column;align-items:flex-end}
      .header-inner{height:68px}
      .main-nav{display:none}
      .header-btns>a{display:none}
      .hamburger{display:block}
      .mega-grid{grid-template-columns:repeat(2,1fr)}
      .footer-main{grid-template-columns:repeat(2,1fr);padding:42px 0 30px}
      .footer-bottom{flex-direction:column}
      .download-hero{padding:60px 0}
      .download-steps{grid-template-columns:repeat(2,1fr)}
      .step-card:not(:last-child):after{display:none}
      .platform-panel{grid-template-columns:1fr}
    }
    @media(max-width:520px){
      .topbar{font-size:11px}
      .topbar-inner{min-height:48px}
      .logo{font-size:16px}
      .logo img{width:30px;height:30px}
      .mega-grid{grid-template-columns:1fr}
      .footer-main{grid-template-columns:1fr;gap:28px}
      .footer-bottom-links{flex-direction:column;gap:4px}
      .download-hero h1{font-size:35px}
      .download-hero p{font-size:14px}
      .download-trust{align-items:flex-start;flex-direction:column;width:max-content;margin-left:auto;margin-right:auto;gap:8px}
      .download-section{padding-top:52px}
      .section-heading h2{font-size:26px}
      .download-steps{grid-template-columns:1fr}
      .platform-card{padding:24px}
      .platform-points{grid-template-columns:1fr}
    }