:root{
      --主题色:#0B3D91;
      --深色:#172033;
      --文字:#263246;
      --浅字:#697589;
      --背景:#f5f7fb;
      --白色:#fff;
      --边框:#dfe5ee;
      --强调:#c58a32;
      --阴影:0 16px 42px rgba(22,40,70,.09);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--文字);background:var(--背景);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.6}
    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:#101827;color:#dbe3f0;font-size:13px}
    .topbar-inner{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-contact{display:flex;gap:22px}
    .topbar a:hover{color:#fff}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--边框)}
    .header-inner{min-height:78px;display:flex;align-items:center;gap:30px}
    .logo{display:inline-flex;align-items:center;gap:10px;font-weight:800;color:var(--深色);white-space:nowrap}
    .logo img{width:34px;height:34px;object-fit:contain}
    .logo span{font-size:19px}
    .main-nav{margin-left:auto}
    .nav-list{display:flex;align-items:stretch;gap:2px;margin:0;padding:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;min-height:78px;padding:0 14px;font-size:15px;font-weight:600;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--主题色)}
    .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%;visibility:hidden;opacity:0;transform:translate(-50%,8px);transition:.2s ease;background:#fff;border:1px solid var(--边框);box-shadow:var(--阴影);border-radius:4px}
    .nav-item:after{content:"";position:absolute;left:0;right:0;bottom:-12px;height:14px}
    .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:translate(-50%,0)}
    .dropdown-panel{width:270px;padding:12px}
    .dropdown-panel a{display:block;padding:10px 12px;border-bottom:1px solid #edf0f5;font-size:14px}
    .dropdown-panel a:hover{background:#f3f6fb;color:var(--主题色)}
    .dropdown-panel .dropdown-all{margin-top:8px;border:0;color:var(--主题色);font-weight:700}
    .mega-menu{width:680px;padding:22px}
    .mega-wide{width:900px}
    .mega-title{margin:0 0 14px;color:var(--深色);font-size:16px}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
    .mega-card{min-width:0;padding:13px;border:1px solid #e5eaf1;border-radius:4px;background:#fbfcfe}
    .mega-card:hover{border-color:#9fb3d5;box-shadow:0 5px 16px rgba(11,61,145,.08)}
    .mega-card img{width:34px;height:34px;object-fit:contain;margin-bottom:8px}
    .mega-card .video-thumb,.mega-card .product-thumb{width:100%;height:70px;object-fit:cover}
    .mega-card strong{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:14px}
    .mega-card p{margin:5px 0 0;color:var(--浅字);font-size:12px;line-height:1.5}
    .mega-meta{display:flex;justify-content:space-between;gap:8px;margin-top:7px;color:var(--浅字);font-size:11px}
    .mega-footer{display:block;margin-top:18px;padding-top:14px;border-top:1px solid var(--边框);color:var(--主题色);font-weight:700;font-size:13px}
    .mega-columns{display:grid;grid-template-columns:180px 1fr;gap:22px}
    .mega-categories a{display:block;padding:7px 0;color:var(--浅字);font-size:13px}
    .mega-categories a:hover{color:var(--主题色)}
    .header-btns{display:flex;align-items:center;gap:12px}
    .account-btn{display:inline-flex;align-items:center;justify-content:center;padding:9px 15px;border-radius:3px;background:var(--主题色);color:#fff;font-size:13px;font-weight:700}
    .hamburger{display:none;width:42px;height:40px;padding:9px;border:1px solid var(--边框);background:#fff;cursor:pointer}
    .hamburger span{display:block;width:22px;height:2px;margin:4px auto;background:var(--深色);transition:.2s}
    .hamburger.active span:nth-child(1){transform:translateY(6px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
    .drawer-overlay{position:fixed;inset:0;z-index:40;background:rgba(12,21,36,.54);visibility:hidden;opacity:0;transition:.2s}
    .drawer-overlay.open{visibility:visible;opacity:1}
    .mobile-drawer{position:fixed;top:0;right:0;z-index:41;width:min(390px,88vw);height:100vh;overflow:auto;background:#fff;transform:translateX(100%);transition:.25s ease;box-shadow:-10px 0 28px rgba(0,0,0,.15)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:14px;padding:20px;border-bottom:1px solid var(--边框)}
    .drawer-head>a{margin-left:auto;color:var(--主题色);font-weight:700}
    .drawer-close{border:0;background:transparent;font-size:28px;line-height:1;cursor:pointer;color:var(--浅字)}
    .drawer-menu{padding:12px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid #edf0f5;background:transparent;text-align:left;color:var(--深色);font-weight:700;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--浅字);font-size:20px;font-weight:400}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:5px 0 8px 16px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--浅字);font-size:14px}
    .footer{margin-top:70px;background:#101827;color:#bdc8d8}
    .footer-main{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.1fr;gap:35px;padding:48px 0 38px}
    .footer .logo{color:#fff;margin-bottom:14px}
    .footer h3{margin:3px 0 15px;color:#fff;font-size:15px}
    .footer p{margin:7px 0;font-size:13px}
    .footer-brand>p:first-of-type{max-width:330px}
    .footer-links{display:grid;gap:9px;font-size:13px}
    .footer a:hover{color:#fff}
    .footer-contact a{color:#e1e8f3}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;padding:17px 0;border-top:1px solid rgba(255,255,255,.12);font-size:12px}
    .category-page{padding:58px 0 0}
    .category-intro{display:grid;grid-template-columns:1.2fr .8fr;align-items:end;gap:35px;padding-bottom:36px;border-bottom:1px solid var(--边框)}
    .category-kicker{margin:0 0 9px;color:var(--强调);font-size:13px;font-weight:800;letter-spacing:1px}
    .category-intro h1{margin:0;color:var(--深色);font-size:38px;line-height:1.2}
    .category-intro p{margin:0;color:var(--浅字);font-size:15px;line-height:1.9}
    .article-list{display:grid;gap:20px;margin-top:30px}
    .article-card{display:grid;grid-template-columns:300px minmax(0,1fr);gap:25px;padding:20px;background:#fff;border:1px solid var(--边框);border-radius:5px;box-shadow:0 5px 20px rgba(30,50,80,.035)}
    .article-card:hover{border-color:#a8bbd9;box-shadow:var(--阴影)}
    .article-cover{height:205px;overflow:hidden;background:#e9eef6}
    .article-cover img{width:100%;height:100%;object-fit:cover}
    .article-body{min-width:0;display:flex;flex-direction:column;align-items:flex-start}
    .article-label{display:inline-flex;padding:4px 9px;background:#eef3fb;color:var(--主题色);font-size:12px;font-weight:700}
    .article-body h2{margin:10px 0 8px;color:var(--深色);font-size:22px;line-height:1.4}
    .article-body h2 a:hover{color:var(--主题色)}
    .article-summary{display:block;margin:0;color:var(--浅字);font-size:14px;line-height:1.8}
    .article-meta{display:flex;flex-wrap:wrap;gap:13px;margin-top:13px;color:#7a8798;font-size:12px}
    .article-tags{margin-top:10px;color:var(--浅字);font-size:12px}
    .article-cta{margin-top:auto;padding-top:13px;color:var(--主题色);font-size:13px;font-weight:700}
    .article-cta:after{content:" →";font-size:16px}
    .pagination{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin:38px 0 10px}
    .pagination a{min-width:38px;padding:8px 12px;border:1px solid var(--边框);background:#fff;text-align:center;color:var(--浅字);font-size:13px}
    .pagination a:hover,.pagination a.active{border-color:var(--主题色);background:var(--主题色);color:#fff}
    @media (max-width:900px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-btns .account-btn{display:none}
      .footer-main{grid-template-columns:repeat(2,1fr)}
      .category-intro{grid-template-columns:1fr}
    }
    @media (max-width:620px){
      .container{width:min(100% - 28px,1180px)}
      .topbar-inner{padding:8px 0;align-items:flex-start;flex-direction:column;gap:2px}
      .topbar-contact{gap:12px;flex-wrap:wrap}
      .header-inner{min-height:66px}
      .category-page{padding-top:36px}
      .category-intro h1{font-size:30px}
      .article-card{grid-template-columns:1fr;padding:14px;gap:16px}
      .article-cover{height:190px}
      .article-body h2{font-size:19px}
      .footer-main{grid-template-columns:1fr;gap:25px;padding:36px 0 28px}
      .footer-bottom{display:block}
      .footer-bottom span{display:block;margin:5px 0}
      .mega-menu,.dropdown-panel{display:none}
    }