:root{
      --主题色:#0B3D91;
      --深色:#10213f;
      --墨色:#172033;
      --浅底:#f5f7fb;
      --边框:#dfe5ef;
      --金色:#d69b35;
      --白色:#fff;
      --阴影:0 14px 40px rgba(16,33,63,.10);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--墨色);background:var(--浅底);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}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .topbar{background:var(--深色);color:#dce5f4;font-size:13px}
    .topbar .container{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar a{margin-left:20px;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:flex;align-items:center;gap:10px;min-width:190px;color:var(--深色);font-size:19px;font-weight:800}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:stretch;justify-content:center;gap:3px;list-style:none;margin:0;padding:0}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;min-height:78px;padding:0 15px;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--主题色)}
    .has-arrow:after{content:"";width:6px;height:6px;margin-left:8px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg) translateY(-2px)}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;width:290px;padding:18px;background:#fff;border:1px solid var(--边框);border-radius:0 0 12px 12px;box-shadow:var(--阴影);opacity:0;visibility:hidden;transform:translate(-50%,8px);transition:.2s}
    .mega-menu{width:510px}
    .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;height:12px;top:-12px}
    .dropdown-panel>a:not(.mega-footer){display:block;padding:8px 10px;border-bottom:1px solid #edf0f5;font-size:14px}
    .dropdown-panel>a:hover,.mega-grid a:hover{color:var(--主题色);background:#f4f7fc}
    .mega-title{margin:0 0 9px;color:var(--深色);font-size:14px;font-weight:800}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
    .mega-grid>a{display:block;padding:9px 10px;border:1px solid #edf0f5;border-radius:8px;font-size:13px}
    .mega-grid strong,.mega-grid small{display:block}
    .mega-grid small{color:#71809a;font-size:11px;line-height:1.5}
    .product-mini{display:grid!important;grid-template-columns:30px 1fr;column-gap:7px}
    .product-mini img{width:28px;height:28px;object-fit:contain;grid-row:span 2}
    .mega-footer{display:block;margin-top:15px;padding-top:12px;border-top:1px solid var(--边框);color:var(--主题色);font-size:13px}
    .header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}
    .member-btn{color:var(--主题色);font-size:14px}
    .open-btn{padding:8px 17px;border-radius:7px;background:var(--主题色);color:#fff;font-size:14px}
    .hamburger{display:none;width:42px;height:40px;padding:9px;border:1px solid var(--边框);border-radius:7px;background:#fff;cursor:pointer}
    .hamburger span{display:block;height:2px;margin:4px 0;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;z-index:50;inset:0;background:rgba(11,26,50,.48);opacity:0;visibility:hidden;transition:.25s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;z-index:51;top:0;right:0;width:min(380px,88vw);height:100vh;overflow:auto;background:#fff;transform:translateX(100%);transition:.3s;box-shadow:-10px 0 30px rgba(0,0,0,.15)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:13px;padding:20px;border-bottom:1px solid var(--边框)}
    .drawer-head strong{flex:1;color:var(--深色)}
    .drawer-head a{padding:5px 12px;border-radius:5px;background:var(--主题色);color:#fff;font-size:13px}
    .drawer-close{border:0;background:none;color:#61708a;font-size:28px;line-height:1;cursor:pointer}
    .drawer-menu{padding:10px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;border:0;border-bottom:1px solid #edf0f5;background:none;text-align:left;color:var(--墨色);font:inherit;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--主题色);font-size:20px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:4px 0 8px 15px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:7px 0;color:#64728a;font-size:14px}
    .footer{margin-top:70px;background:var(--深色);color:#cbd6e7}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:35px;padding:50px 0 38px}
    .footer h3{margin:0 0 14px;color:#fff;font-size:16px}
    .footer-brand strong{display:block;margin-bottom:12px;color:#fff;font-size:20px}
    .footer p{margin:7px 0;font-size:13px}
    .footer-grid>div:not(.footer-brand) a{display:block;margin:7px 0;color:#cbd6e7;font-size:13px}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{padding:18px 0;border-top:1px solid rgba(255,255,255,.14);font-size:12px;color:#aebbd0}
    .video-page{padding:60px 0 10px}
    .video-heading{text-align:center;max-width:760px;margin:0 auto 35px}
    .video-heading .eyebrow{display:inline-block;margin-bottom:10px;color:var(--金色);font-size:13px;font-weight:700;letter-spacing:2px}
    .video-heading h1{margin:0;color:var(--深色);font-size:clamp(30px,4vw,46px);line-height:1.2}
    .video-heading p{margin:16px 0 0;color:#6e7b91}
    .video-filter{display:flex;justify-content:center;flex-wrap:wrap;gap:10px;margin:0 auto 30px}
    .video-filter a{padding:7px 17px;border:1px solid var(--边框);border-radius:30px;background:#fff;color:#61708a;font-size:13px}
    .video-filter a:hover,.video-filter a.active{border-color:var(--主题色);background:var(--主题色);color:#fff}
    .video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
    .video-card{overflow:hidden;border:1px solid var(--边框);border-radius:14px;background:#fff;box-shadow:0 6px 20px rgba(16,33,63,.05);transition:.2s}
    .video-card:hover{transform:translateY(-4px);box-shadow:var(--阴影)}
    .video-cover{position:relative;aspect-ratio:16/9;overflow:hidden;background:#dce5f3}
    .video-cover img{width:100%;height:100%;object-fit:cover;transition:.3s}
    .video-card:hover .video-cover img{transform:scale(1.04)}
    .play-mark{position:absolute;left:50%;top:50%;width:48px;height:48px;display:grid;place-items:center;transform:translate(-50%,-50%);border:1px solid rgba(255,255,255,.7);border-radius:50%;background:rgba(11,61,145,.9);color:#fff;font-size:20px}
    .duration{position:absolute;right:10px;bottom:10px;padding:2px 7px;border-radius:4px;background:rgba(0,0,0,.7);color:#fff;font-size:12px}
    .video-body{padding:19px}
    .video-body h2{margin:0 0 9px;color:var(--深色);font-size:18px;line-height:1.45}
    .video-body p{display:-webkit-box;overflow:hidden;margin:0 0 14px;color:#6c7890;font-size:14px;line-height:1.7;-webkit-box-orient:vertical;-webkit-line-clamp:3}
    .video-meta{display:flex;justify-content:space-between;gap:12px;color:#8b97a9;font-size:12px}
    .video-link{display:inline-block;margin-top:13px;color:var(--主题色);font-size:13px;font-weight:700}
    .pagination{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin-top:38px}
    .pagination a{min-width:36px;padding:6px 12px;border:1px solid var(--边框);border-radius:6px;background:#fff;text-align:center;color:#61708a;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:1050px){
      .nav-link{padding:0 9px;font-size:14px}
      .logo{min-width:160px}
      .mega-menu{width:450px}
    }
    @media(max-width:820px){
      .container{width:min(100% - 30px,680px)}
      .topbar .container{min-height:44px;align-items:flex-start;flex-direction:column;justify-content:center;gap:0}
      .topbar a{margin-left:12px}
      .main-nav{display:none}
      .header-inner{min-height:68px;justify-content:space-between;gap:12px}
      .header-btns{margin-left:auto}
      .member-btn{display:none}
      .hamburger{display:block}
      .video-page{padding-top:42px}
      .video-grid{grid-template-columns:repeat(2,1fr);gap:18px}
      .footer-grid{grid-template-columns:repeat(2,1fr);gap:25px}
    }
    @media(max-width:560px){
      .topbar{font-size:11px}
      .topbar .container{width:calc(100% - 28px)}
      .logo{min-width:0;font-size:16px}
      .logo img{width:32px;height:32px}
      .open-btn{padding:7px 11px;font-size:12px}
      .video-heading h1{font-size:31px}
      .video-heading p{font-size:14px}
      .video-grid{grid-template-columns:1fr}
      .video-body{padding:16px}
      .footer-grid{grid-template-columns:1fr;gap:20px;padding:36px 0 28px}
      .footer{margin-top:45px}
    }