:root{--theme:#0B3D91;--ink:#132238;--muted:#667085;--line:#e5eaf1;--soft:#f5f8fc;--white:#fff;--shadow:0 18px 50px rgba(18,45,82,.1)}
    *{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}
    button{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:auto}
    .topbar{background:#071b38;color:#dbe8fb;font-size:13px}
    .topbar-inner{height:38px;display:flex;justify-content:space-between;align-items:center}
    .topbar-contact{display:flex;gap:22px}
    .topbar a:hover{color:#fff}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:82px;display:flex;align-items:center;gap:34px}
    .logo{display:flex;align-items:center;gap:10px;white-space:nowrap;font-weight:800;font-size:19px;color:var(--theme)}
    .logo img{width:38px;height:38px;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:block;padding:27px 13px;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-item:focus-within>.nav-link{color:var(--theme)}
    .has-arrow:after{content:"⌄";font-size:12px;margin-left:6px;color:#8792a5}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% - 1px);left:50%;transform:translateX(-50%);opacity:0;visibility:hidden;pointer-events:none;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);transition:.2s;z-index:30}
    .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{width:310px;padding:20px}
    .dropdown-title,.mega-head strong{display:block;margin:0 0 5px;font-weight:800}
    .dropdown-list{display:grid;gap:9px;padding:10px 0 16px}
    .dropdown-list a{font-size:14px;color:#475467;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .dropdown-list a:hover{color:var(--theme)}
    .dropdown-more,.mega-footer{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding-top:12px;color:var(--theme);font-size:13px}
    .mega-menu{width:780px;padding:24px}
    .mega-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:16px}
    .mega-head span{color:var(--muted);font-size:13px}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:18px}
    .mega-card{min-width:0;padding:13px;border:1px solid var(--line);border-radius:10px;background:#fff}
    .mega-card:hover{border-color:#9db5df;transform:translateY(-2px)}
    .mega-card img{width:32px;height:32px;object-fit:contain;margin-bottom:8px}
    .mega-card img.cover{width:100%;height:62px;object-fit:cover;border-radius:6px}
    .mega-card strong{display:block;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .mega-card p{margin:4px 0;color:var(--muted);font-size:12px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
    .mega-meta{display:flex;flex-wrap:wrap;gap:5px 10px;margin-top:7px;color:#7b8798;font-size:11px}
    .mega-categories{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 17px}
    .mega-categories a{padding:4px 10px;border-radius:20px;background:var(--soft);font-size:12px;color:#475467}
    .mega-categories a:hover{background:#e1ebfb;color:var(--theme)}
    .header-btns{display:flex;align-items:center;gap:13px}
    .member-entry{color:var(--theme);font-size:14px;white-space:nowrap}
    .account-entry{padding:8px 17px;border-radius:5px;background:var(--theme);color:#fff;font-size:14px}
    .hamburger{display:none;width:42px;height:38px;padding:8px;border:1px solid var(--line);border-radius:5px;background:#fff;cursor:pointer}
    .hamburger span{display:block;width:22px;height:2px;margin:4px auto;background:var(--theme);transition:.2s}
    .hamburger.active span:first-child{transform:translateY(6px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:last-child{transform:translateY(-6px) rotate(-45deg)}
    .drawer-overlay{position:fixed;inset:0;background:rgba(5,17,35,.48);opacity:0;visibility:hidden;transition:.25s;z-index:50}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:0;width:min(390px,88vw);height:100vh;overflow:auto;background:#fff;transform:translateX(100%);transition:.25s;z-index:51;box-shadow:-10px 0 30px rgba(0,0,0,.12)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:15px;padding:20px;border-bottom:1px solid var(--line);color:var(--theme);font-weight:700}
    .drawer-head>a{margin-left:auto;padding:5px 12px;background:var(--theme);color:#fff;border-radius:4px;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:14px 0;border:0;border-bottom:1px solid var(--line);background:none;text-align:left;color:var(--ink);cursor:pointer}
    .drawer-toggle:after{content:"＋";float:right;color:var(--muted)}
    .drawer-toggle.active:after{content:"－"}
    .drawer-submenu{display:none;padding:5px 0 8px 15px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:7px 0;color:var(--muted);font-size:14px}
    .footer{margin-top:80px;background:#071b38;color:#c6d4e8}
    .footer-main{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.1fr;gap:42px;padding:55px 0 46px}
    .footer .logo{color:#fff;margin-bottom:16px}
    .footer-brand p{margin:0;color:#9fb1ca;font-size:13px;line-height:1.9}
    .footer h3{margin:0 0 15px;color:#fff;font-size:15px}
    .footer-links{display:grid;gap:8px;font-size:13px;color:#aebed3}
    .footer-links a:hover,.footer-contact a:hover{color:#fff}
    .footer-contact{display:grid;gap:9px;color:#aebed3;font-size:13px}
    .footer-bottom{border-top:1px solid rgba(255,255,255,.12)}
    .footer-bottom-inner{display:flex;justify-content:space-between;gap:20px;padding:18px 0;color:#91a4bd;font-size:12px}
    .download-page-main{background:linear-gradient(180deg,#f5f8fc 0,#fff 55%);padding:70px 0 5px}
    .download-hero{text-align:center;max-width:820px;margin:0 auto 45px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:6px 13px;border-radius:30px;background:#e8f0fb;color:var(--theme);font-size:13px;font-weight:700}
    .eyebrow:before{content:"";width:7px;height:7px;border-radius:50%;background:#e04b4b}
    .download-hero h1{margin:17px 0 12px;font-size:clamp(32px,5vw,55px);line-height:1.15;letter-spacing:-1px;color:#11294d}
    .download-hero p{margin:0 auto;color:var(--muted);font-size:16px;max-width:650px}
    .download-actions{display:flex;justify-content:center;gap:12px;margin-top:25px}
    .button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 22px;border-radius:5px;border:1px solid var(--theme);font-size:14px;font-weight:700}
    .button-primary{background:var(--theme);color:#fff}
    .button-secondary{background:#fff;color:var(--theme)}
    .download-panel{display:grid;grid-template-columns:1.05fr 1fr;gap:30px;align-items:stretch;margin-bottom:58px}
    .platform-card,.steps-card,.faq-card{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow)}
    .platform-card{padding:30px;display:flex;flex-direction:column;justify-content:center}
    .platform-card h2,.steps-card h2,.faq-card h2{margin:0 0 9px;font-size:23px;color:#132d54}
    .platform-card>p,.steps-card>p{margin:0 0 20px;color:var(--muted);font-size:14px}
    .platform-list{display:grid;gap:12px}
    .platform-item{display:flex;align-items:center;gap:13px;padding:14px;border:1px solid var(--line);border-radius:10px}
    .platform-icon{width:38px;height:38px;border-radius:9px;background:#e8f0fb;color:var(--theme);display:grid;place-items:center;font-weight:800}
    .platform-item strong{display:block;font-size:14px}
    .platform-item small{display:block;color:var(--muted);font-size:12px}
    .platform-item .button{margin-left:auto;min-height:34px;padding:0 13px;font-size:12px}
    .download-visual{position:relative;min-height:390px;overflow:hidden;border-radius:16px;background:radial-gradient(circle at 70% 28%,#316ebd,transparent 30%),linear-gradient(135deg,#071b38,#0b3d91 58%,#09254b);box-shadow:var(--shadow)}
    .download-visual:before{content:"";position:absolute;inset:20px;border:1px solid rgba(255,255,255,.18);border-radius:11px}
    .visual-window{position:absolute;left:12%;right:12%;top:17%;bottom:15%;padding:18px;border:1px solid rgba(255,255,255,.3);border-radius:9px;background:rgba(3,16,39,.63);box-shadow:0 25px 50px rgba(0,0,0,.25)}
    .window-top{display:flex;gap:6px;margin-bottom:25px}
    .window-top i{width:8px;height:8px;border-radius:50%;background:#ef6b65}
    .window-top i:nth-child(2){background:#f0c85a}.window-top i:nth-child(3){background:#60c98b}
    .screen-line{height:9px;margin:13px 0;border-radius:10px;background:linear-gradient(90deg,#6ba8ff 0 34%,rgba(255,255,255,.14) 34%)}
    .screen-line.short{width:65%}
    .screen-chart{height:105px;margin-top:22px;border-bottom:2px solid #e5b957;background:linear-gradient(155deg,transparent 45%,rgba(229,185,87,.8) 46% 48%,transparent 49% 57%,rgba(94,177,255,.9) 58% 60%,transparent 61%);opacity:.9}
    .visual-label{position:absolute;right:9%;bottom:9%;color:#fff;font-size:12px;letter-spacing:1px}
    .steps-section{margin-bottom:58px}
    .section-heading{text-align:center;margin-bottom:25px}
    .section-heading h2{margin:0 0 7px;font-size:28px;color:#132d54}
    .section-heading p{margin:0;color:var(--muted);font-size:14px}
    .steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .steps-card{padding:25px}
    .step-number{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--theme);color:#fff;font-weight:800;margin-bottom:17px}
    .steps-card h3{margin:0 0 7px;font-size:17px}
    .steps-card p{margin:0;color:var(--muted);font-size:13px}
    .faq-card{max-width:850px;margin:auto;padding:28px 32px}
    .faq-list{display:grid;gap:0}
    .faq-item{border-bottom:1px solid var(--line)}
    .faq-question{width:100%;padding:17px 0;border:0;background:none;text-align:left;font-weight:700;color:#243b5d;cursor:pointer}
    .faq-question:after{content:"＋";float:right;color:var(--theme)}
    .faq-item.open .faq-question:after{content:"－"}
    .faq-answer{display:none;padding:0 28px 16px 0;color:var(--muted);font-size:13px}
    .faq-item.open .faq-answer{display:block}
    @media(max-width:1050px){
      .main-nav{display:none}.hamburger{display:block}.header-inner{justify-content:space-between}.header-btns{margin-left:auto}
      .mega-menu{display:none}.download-panel{grid-template-columns:1fr}
    }
    @media(max-width:720px){
      .container{width:min(100% - 28px,1180px)}.topbar-inner{height:auto;padding:8px 0;align-items:flex-start;gap:8px}.topbar-contact{gap:8px;flex-direction:column;text-align:right;font-size:11px}.topbar{font-size:11px}
      .header-inner{height:68px;gap:10px}.logo{font-size:16px}.logo img{width:32px;height:32px}.member-entry{display:none}.account-entry{padding:7px 11px;font-size:12px}
      .download-page-main{padding-top:48px}.download-hero h1{font-size:34px}.download-hero p{font-size:14px}.download-actions{flex-direction:column;padding:0 22px}
      .button{width:100%}.platform-card{padding:20px}.platform-item{align-items:flex-start;flex-wrap:wrap}.platform-item .button{margin-left:51px}.download-visual{min-height:300px}.visual-window{left:8%;right:8%;top:19%;bottom:17%}
      .steps-grid{grid-template-columns:1fr}.section-heading h2{font-size:24px}.faq-card{padding:22px 20px}.footer-main{grid-template-columns:1fr 1fr;gap:28px;padding:38px 0}.footer-brand{grid-column:1/-1}.footer-bottom-inner{display:block;line-height:2}
    }