:root{
      --theme:#0B3D91;
      --theme-dark:#082b68;
      --ink:#172033;
      --muted:#68758a;
      --line:#e4e9f1;
      --soft:#f4f7fb;
      --white:#fff;
      --shadow:0 16px 42px rgba(20,43,82,.09);
      --radius:16px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#fff;font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;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:0 auto}
    .topbar{background:#f5f7fb;border-bottom:1px solid var(--line);color:#657188;font-size:13px}
    .topbar .container{height:38px;display:flex;align-items:center;justify-content:space-between}
    .topbar-links{display:flex;gap:22px}
    .topbar a:hover{color:var(--theme)}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:78px;display:flex;align-items:center;gap:35px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;color:var(--theme);font-size:19px;font-weight:800}
    .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;margin:0;padding:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:block;padding:25px 14px;color:#27334a;font-size:14px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"";display:inline-block;width:6px;height:6px;margin:0 0 3px 7px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg)}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% - 1px);left:50%;width:310px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transform:translate(-50%,8px);transition:.2s ease}
    .mega-menu{width:680px}
    .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;transform:translate(-50%,0)}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-14px;height:14px}
    .panel-title{margin:0 0 12px;color:var(--theme);font-size:14px}
    .panel-list{display:grid;gap:8px}
    .panel-list a{display:flex;justify-content:space-between;gap:10px;padding:7px 0;color:#39465b;font-size:13px;border-bottom:1px solid #eef1f6}
    .panel-list a:hover,.mega-card:hover{color:var(--theme)}
    .panel-list small{color:var(--muted);font-size:11px}
    .mega-grid{display:grid;grid-template-columns:1.3fr .9fr;gap:28px}
    .mega-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:9px}
    .mega-card{display:grid;gap:3px;padding:12px;border:1px solid var(--line);border-radius:10px;color:#29364b;font-size:12px}
    .mega-card img{width:28px;height:28px;object-fit:contain}
    .mega-card strong{font-size:13px}
    .mega-card small{color:var(--muted);font-size:11px}
    .mega-footer{display:inline-block;margin-top:15px;color:var(--theme);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}
    .member-btn,.open-btn{padding:8px 13px;border-radius:8px;font-size:13px}
    .member-btn{color:var(--theme);border:1px solid #cbd8ee}
    .open-btn{color:#fff;background:var(--theme)}
    .hamburger{display:none;width:40px;height:40px;border:1px solid var(--line);border-radius:8px;background:#fff;cursor:pointer}
    .hamburger span{display:block;width:19px;height:2px;margin:4px auto;background:var(--theme);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{display:none;position:fixed;inset:0;background:rgba(8,24,51,.45);z-index:50}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;top:0;right:0;width:min(390px,88vw);height:100vh;background:#fff;z-index:60;transform:translateX(100%);transition:.25s ease;overflow:auto;box-shadow:-8px 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(--line);font-weight:700;color:var(--theme)}
    .drawer-head a{margin-left:auto;padding:6px 12px;border-radius:7px;background:var(--theme);color:#fff;font-size:13px}
    .drawer-close{border:0;background:none;color:#536178;font-size:28px;line-height:1;cursor:pointer}
    .drawer-menu{padding:12px 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:#27344b;font-size:15px;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:20px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:6px 0 10px 15px}
    .drawer-submenu.open{display:grid}
    .drawer-submenu a{padding:7px 0;color:var(--muted);font-size:13px}
    .footer{margin-top:80px;background:#111d32;color:#c6d0df}
    .footer .container{padding:52px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:38px}
    .footer h3{margin:0 0 15px;color:#fff;font-size:15px}
    .footer a{display:block;margin:7px 0;color:#c6d0df;font-size:13px}
    .footer a:hover{color:#fff}
    .footer-brand strong{display:block;margin-bottom:12px;color:#fff;font-size:20px}
    .footer-brand p,.footer p{margin:7px 0;color:#aebbd0;font-size:13px}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:35px;padding-top:18px;border-top:1px solid rgba(255,255,255,.12);color:#91a0b6;font-size:12px}
    .productlist-main{background:#f7f9fc;padding:62px 0 10px;min-height:640px}
    .product-hero{text-align:center;max-width:760px;margin:0 auto 38px}
    .product-crumb{display:inline-flex;align-items:center;gap:8px;margin-bottom:12px;color:var(--theme);font-size:13px;font-weight:700}
    .product-hero h1{margin:0;color:#14294b;font-size:clamp(30px,4vw,46px);letter-spacing:.02em}
    .product-hero p{margin:14px 0 0;color:var(--muted);font-size:15px}
    .product-layout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:26px;align-items:start}
    .category-box,.products-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 28px rgba(29,58,100,.05)}
    .category-box{padding:22px;position:sticky;top:20px}
    .category-box h2{margin:0 0 14px;color:#172d52;font-size:17px}
    .category-box a{display:block;padding:10px 11px;border-radius:8px;color:#66748a;font-size:13px}
    .category-box a:hover{background:#edf3fc;color:var(--theme)}
    .products-panel{padding:25px}
    .products-head{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:20px;padding-bottom:17px;border-bottom:1px solid var(--line)}
    .products-head h2{margin:0;color:#1a2d4e;font-size:21px}
    .products-head span{color:var(--muted);font-size:13px}
    .product-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
    .product-card{display:flex;flex-direction:column;min-width:0;border:1px solid var(--line);border-radius:13px;background:#fff;overflow:hidden;transition:.2s ease}
    .product-card:hover{transform:translateY(-4px);box-shadow:0 12px 28px rgba(20,61,120,.12);border-color:#c4d4ed}
    .product-cover{height:150px;background:#edf3fb;display:flex;align-items:center;justify-content:center;overflow:hidden}
    .product-cover img{width:100%;height:100%;object-fit:cover}
    .product-body{display:flex;flex:1;flex-direction:column;padding:17px}
    .product-body h3{margin:0 0 8px;color:#1a2f52;font-size:17px}
    .product-summary{display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;overflow:hidden;min-height:72px;color:#6b778a;font-size:13px;line-height:1.8}
    .product-meta{display:flex;justify-content:space-between;gap:8px;margin-top:16px;padding-top:12px;border-top:1px solid #edf0f5;color:#8994a5;font-size:11px}
    .product-link{display:inline-block;margin-top:14px;color:var(--theme);font-size:13px;font-weight:700}
    .pagination{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin-top:32px}
    .pagination a{min-width:34px;padding:6px 11px;border:1px solid var(--line);border-radius:7px;background:#fff;text-align:center;color:#647289;font-size:13px}
    .pagination a:hover,.pagination a.active{border-color:var(--theme);background:var(--theme);color:#fff}
    @media(max-width:1050px){
      .header-inner{gap:15px}.nav-link{padding-left:8px;padding-right:8px}.logo{min-width:155px}
    }
    @media(max-width:820px){
      .container{width:min(100% - 28px,680px)}
      .topbar .container{height:auto;min-height:38px;padding:8px 0;align-items:flex-start;gap:10px}
      .topbar-links{flex-direction:column;gap:0;text-align:right}
      .main-nav{display:none}.hamburger{display:block}.member-btn{display:none}
      .header-inner{height:68px}.header-btns{margin-left:auto}
      .productlist-main{padding-top:42px}.product-layout{grid-template-columns:1fr}
      .category-box{position:static}.category-box div{display:flex;flex-wrap:wrap;gap:5px}
      .category-box a{padding:7px 10px;background:#f5f7fb}
      .product-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
      .footer-grid{grid-template-columns:repeat(2,1fr);gap:26px}
      .footer-bottom{display:block}.footer-bottom span{display:block;margin-top:5px}
    }
    @media(max-width:520px){
      .topbar{font-size:11px}.topbar .container{display:block}.topbar-links{display:block;margin-top:3px;text-align:left}
      .topbar-links a{display:inline-block;margin-right:12px}
      .logo{font-size:16px;min-width:0}.logo img{width:29px;height:29px}
      .open-btn{padding:7px 10px;font-size:12px}
      .product-hero h1{font-size:31px}.product-hero p{font-size:13px}
      .products-panel{padding:16px}.products-head{display:block}.products-head span{display:block;margin-top:5px}
      .product-grid{grid-template-columns:1fr}.product-cover{height:165px}
      .footer-grid{grid-template-columns:1fr}.footer{margin-top:50px}
    }