:root{--primary:#0B3D91;--primary-dark:#072b68;--accent:#d71f74;--text:#172033;--muted:#667085;--line:#e4e7ec;--soft:#f5f7fa;--white:#fff;--shadow:0 14px 40px rgba(11,61,145,.10)}
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--text);background:#f7f8fb;font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.7}
    body.drawer-locked{overflow:hidden}
    img{display:block;max-width:100%}
    a{color:inherit;text-decoration:none}
    button,input,textarea,select{font:inherit}
    .container{width:min(1200px,calc(100% - 40px));margin:0 auto}

    .topbar{background:var(--primary-dark);color:#dce8ff;font-size:13px}
    .topbar-inner{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:24px}
    .topbar-contact{display:flex;gap:22px}
    .topbar-contact a:hover{color:#fff}

    .header{position:relative;z-index:100;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 5px 20px rgba(16,24,40,.04)}
    .header-inner{min-height:78px;display:flex;align-items:center;gap:24px}
    .logo{display:inline-flex;align-items:center;gap:10px;font-size:20px;font-weight:800;color:var(--primary);white-space:nowrap}
    .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 14px;font-size:15px;font-weight:700;color:#344054;transition:.2s}
    .nav-link:hover,.nav-item:focus-within>.nav-link{color:var(--primary)}
    .has-arrow:after{content:"";width:6px;height:6px;margin-left:7px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg) translateY(-2px)}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:0;visibility:hidden;opacity:0;transform:translateY(8px);pointer-events:none;background:#fff;border:1px solid var(--line);box-shadow:0 22px 60px rgba(16,24,40,.16);transition:.2s}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-10px;height:10px}
    .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;transform:none;pointer-events:auto}
    .dropdown-panel{width:320px;padding:16px;border-radius:0 0 14px 14px}
    .dropdown-title{display:block;padding:3px 8px 10px;color:var(--primary);font-weight:800}
    .dropdown-panel>a:not(.dropdown-main){display:block;padding:9px 8px;border-radius:8px;color:#475467;font-size:14px}
    .dropdown-panel>a:not(.dropdown-main):hover{background:#f1f5ff;color:var(--primary)}
    .dropdown-main{display:flex;justify-content:space-between;margin-top:8px;padding:10px 12px;border-radius:8px;background:var(--primary);color:#fff;font-weight:700}
    .mega-menu{left:50%;width:min(920px,92vw);padding:22px;border-radius:0 0 18px 18px;transform:translate(-50%,8px)}
    .nav-item:hover>.mega-menu,.nav-item:focus-within>.mega-menu{transform:translate(-50%,0)}
    .nav-item:nth-last-child(-n+3) .mega-menu{left:auto;right:-120px}
    .nav-item:nth-last-child(-n+3):hover>.mega-menu,.nav-item:nth-last-child(-n+3):focus-within>.mega-menu{transform:none}
    .mega-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid var(--line)}
    .mega-head strong{font-size:18px;color:var(--primary)}
    .mega-head span{font-size:13px;color:var(--muted)}
    .mega-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
    .mega-card{min-width:0;padding:13px;border:1px solid var(--line);border-radius:12px;background:#fff;transition:.2s}
    .mega-card:hover{border-color:#abc3ed;transform:translateY(-2px);box-shadow:0 10px 25px rgba(11,61,145,.09)}
    .mega-card-top{display:flex;align-items:center;gap:10px;min-width:0}
    .mega-card-top img{width:42px;height:42px;border-radius:9px;object-fit:contain;background:#f4f6f8}
    .mega-card-top div,.mega-card-top strong{min-width:0}
    .mega-card strong{display:block;overflow:hidden;color:#24324a;text-overflow:ellipsis;white-space:nowrap}
    .mega-card p{display:-webkit-box;overflow:hidden;margin:8px 0 0;color:var(--muted);font-size:13px;line-height:1.55;-webkit-box-orient:vertical;-webkit-line-clamp:2}
    .mega-rating,.mega-video-duration{display:block;color:var(--accent);font-size:12px}
    .mega-meta{display:flex;flex-wrap:wrap;gap:6px 10px;margin-top:10px;color:var(--muted);font-size:12px}
    .mega-categories{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:15px}
    .mega-categories a{padding:6px 11px;border-radius:999px;background:#edf3ff;color:var(--primary);font-size:13px}
    .mega-video-card{display:flex;gap:11px}
    .mega-video-card>img{width:88px;height:62px;border-radius:8px;object-fit:cover}
    .mega-video-copy{min-width:0}
    .mega-video-copy p{margin:4px 0}
    .mega-footer{display:block;margin-top:16px;padding:10px;text-align:center;border-radius:9px;background:#f0f4fb;color:var(--primary);font-weight:800}
    .header-btns{display:flex;align-items:center;gap:9px}
    .member-entry,.account-entry{display:flex;align-items:center;justify-content:center;min-height:38px;padding:0 14px;border-radius:8px;font-size:14px;font-weight:700}
    .member-entry{color:var(--primary);border:1px solid #c8d5ec}
    .account-entry{background:var(--primary);color:#fff}
    .hamburger{display:none;width:42px;height:42px;padding:9px;border:0;border-radius:8px;background:#edf3ff;cursor:pointer}
    .hamburger span{display:block;width:100%;height:2px;margin:5px 0;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;z-index:998;inset:0;visibility:hidden;opacity:0;background:rgba(15,23,42,.55);transition:.25s}
    .drawer-overlay.open{visibility:visible;opacity:1}
    .mobile-drawer{position:fixed;z-index:999;top:0;right:0;width:min(390px,88vw);height:100%;overflow-y:auto;background:#fff;transform:translateX(105%);transition:.28s}
    .mobile-drawer.open{transform:none}
    .drawer-head{display:flex;align-items:center;gap:10px;min-height:72px;padding:14px 20px;border-bottom:1px solid var(--line)}
    .drawer-head>a{padding:7px 12px;border-radius:7px;background:var(--primary);color:#fff}
    .drawer-close{margin-left:auto;border:0;background:transparent;color:#344054;font-size:32px;cursor:pointer}
    .drawer-menu{padding:13px 20px 30px}
    .drawer-link,.drawer-toggle{width:100%;display:flex;align-items:center;justify-content:space-between;padding:13px 4px;border:0;border-bottom:1px solid var(--line);background:none;color:#26334b;text-align:left;font-weight:800;cursor:pointer}
    .drawer-toggle:after{content:"+";font-size:21px;color:var(--primary)}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:7px 0 12px 15px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:9px 5px;color:var(--muted);font-size:14px}

    .ea-content-stack{padding:0 0 70px}
    .ea-content-stack .product-banner{padding:34px 0;background:linear-gradient(135deg,#071f4c,#0B3D91 60%,#1859b6);color:#fff}
    .ea-content-stack .breadcrumbs{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:18px;color:#cfddf5;font-size:14px}
    .ea-content-stack .breadcrumbs a:hover{color:#fff}
    .ea-content-stack .product-heading{max-width:900px}
    .ea-content-stack .product-kicker{display:inline-flex;padding:5px 11px;border:1px solid rgba(255,255,255,.3);border-radius:999px;background:rgba(255,255,255,.09);font-size:13px}
    .ea-content-stack .product-heading h1{margin:12px 0 10px;font-size:clamp(30px,4vw,48px);line-height:1.2}
    .ea-content-stack .product-heading p{max-width:780px;margin:0;color:#dbe7fa;font-size:17px}
    .ea-content-stack .product-meta{display:flex;flex-wrap:wrap;gap:10px 22px;margin-top:18px;color:#c9d9f2;font-size:14px}
    .ea-content-stack .product-shell{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:28px;align-items:start;margin-top:30px}
    .ea-content-stack .product-main,.ea-content-stack .product-side-card,.ea-content-stack .related-section{border:1px solid var(--line);border-radius:18px;background:#fff;box-shadow:var(--shadow)}
    .ea-content-stack .product-main{min-width:0;overflow:hidden}
    .ea-content-stack .product-cover{padding:24px;background:linear-gradient(145deg,#edf3ff,#fafbfc)}
    .ea-content-stack .product-cover img{width:100%;max-height:520px;margin:auto;border-radius:14px;object-fit:contain}
    .ea-content-stack .product-summary{padding:25px 28px;border-bottom:1px solid var(--line)}
    .ea-content-stack .product-summary h2,.ea-content-stack .product-body h2{margin-top:0;color:#122a55}
    .ea-content-stack .product-summary p{margin:0;color:#536176;font-size:16px}
    .ea-content-stack .product-body{min-width:0;max-width:100%;overflow-x:auto;padding:28px;color:#344054}
    .ea-content-stack .product-body img,.ea-content-stack .product-body video,.ea-content-stack .product-body iframe,.ea-content-stack .product-body table{max-width:100%}
    .ea-content-stack .product-body table{width:100%;border-collapse:collapse}
    .ea-content-stack .product-body th,.ea-content-stack .product-body td{padding:10px;border:1px solid var(--line)}
    .ea-content-stack .product-body a{color:var(--primary);text-decoration:underline}
    .ea-content-stack .product-sidebar{display:grid;gap:18px;position:sticky;top:20px}
    .ea-content-stack .product-side-card{padding:22px}
    .ea-content-stack .product-side-card h2{margin:0 0 14px;font-size:19px;color:#163567}
    .ea-content-stack .fact-list{display:grid;gap:0;margin:0}
    .ea-content-stack .fact-row{display:flex;justify-content:space-between;gap:15px;padding:11px 0;border-bottom:1px solid var(--line)}
    .ea-content-stack .fact-row:last-child{border-bottom:0}
    .ea-content-stack .fact-row dt{color:var(--muted)}
    .ea-content-stack .fact-row dd{margin:0;text-align:right;font-weight:700}
    .ea-content-stack .side-action{display:block;padding:12px 16px;border-radius:9px;background:var(--primary);color:#fff;text-align:center;font-weight:800}
    .ea-content-stack .side-note{margin:12px 0 0;color:var(--muted);font-size:13px}
    .ea-content-stack .related-section{margin-top:32px;padding:28px}
    .ea-content-stack .section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:20px}
    .ea-content-stack .section-head h2{margin:0;color:#163567;font-size:27px}
    .ea-content-stack .section-head p{margin:0;color:var(--muted)}
    .ea-content-stack .related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
    .ea-content-stack .related-card{display:flex;min-width:0;flex-direction:column;overflow:hidden;border:1px solid var(--line);border-radius:14px;background:#fff;transition:.2s}
    .ea-content-stack .related-card:hover{transform:translateY(-4px);border-color:#a8bde2;box-shadow:0 14px 30px rgba(11,61,145,.1)}
    .ea-content-stack .related-card img{width:100%;height:170px;object-fit:cover;background:#eef2f7}
    .ea-content-stack .related-copy{display:flex;flex:1;flex-direction:column;padding:17px}
    .ea-content-stack .related-copy h3{margin:0 0 8px;color:#20365d;font-size:18px;line-height:1.4}
    .ea-content-stack .related-copy p{display:-webkit-box;overflow:hidden;margin:0 0 14px;color:var(--muted);font-size:14px;-webkit-box-orient:vertical;-webkit-line-clamp:3}
    .ea-content-stack .related-meta{display:flex;justify-content:space-between;gap:10px;margin-top:auto;padding-top:12px;border-top:1px solid var(--line);color:#7a8495;font-size:12px}

    .footer{background:#081a39;color:#b9c7dc}
    .footer-main{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.25fr;gap:42px;padding-top:52px;padding-bottom:42px}
    .footer .logo{color:#fff}
    .footer-brand p{max-width:390px;margin:18px 0;color:#9fb0c9}
    .footer h2{margin:7px 0 17px;color:#fff;font-size:17px}
    .footer-links,.footer-contact{display:grid;gap:10px}
    .footer a:hover{color:#fff}
    .footer-social{display:flex;flex-wrap:wrap;gap:15px;color:#dce7f8}
    .footer-contact span{font-size:14px}
    .footer-bottom{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:20px;border-top:1px solid rgba(255,255,255,.12);font-size:13px}
    .footer-bottom-links{display:flex;gap:18px}

    @media (max-width:1120px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-inner{min-height:70px}
      .header-btns{margin-left:auto}
      .ea-content-stack .product-shell{grid-template-columns:minmax(0,1fr) 270px}
    }
    @media (max-width:860px){
      .topbar-welcome{display:none}
      .topbar-inner{justify-content:center}
      .ea-content-stack .product-shell{grid-template-columns:1fr}
      .ea-content-stack .product-sidebar{position:static;grid-template-columns:repeat(2,minmax(0,1fr))}
      .ea-content-stack .related-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
      .footer-main{grid-template-columns:repeat(2,minmax(0,1fr))}
    }
    @media (max-width:620px){
      .container{width:min(100% - 28px,1200px)}
      .topbar-contact{width:100%;justify-content:space-between;gap:10px;font-size:12px}
      .header-btns .member-entry,.header-btns .account-entry{display:none}
      .logo{font-size:17px}
      .logo img{width:37px;height:37px}
      .ea-content-stack .product-banner{padding:26px 0}
      .ea-content-stack .product-heading h1{font-size:30px}
      .ea-content-stack .product-heading p{font-size:15px}
      .ea-content-stack .product-cover,.ea-content-stack .product-summary,.ea-content-stack .product-body{padding:19px}
      .ea-content-stack .product-sidebar{grid-template-columns:1fr}
      .ea-content-stack .related-section{padding:20px}
      .ea-content-stack .section-head{display:block}
      .ea-content-stack .section-head p{margin-top:7px}
      .ea-content-stack .related-grid{grid-template-columns:1fr}
      .footer-main{grid-template-columns:1fr;gap:26px;padding-top:38px}
      .footer-bottom{align-items:flex-start;flex-direction:column;justify-content:center;padding:18px 0}
    }