:root{
      --theme:#0B3D91;
      --ink:#172033;
      --muted:#657083;
      --line:#dfe5ee;
      --soft:#f4f7fb;
      --white:#fff;
      --shadow:0 14px 38px rgba(15,35,67,.09);
      --radius:16px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f8fafc;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:#13233d;color:#d9e4f4;font-size:13px}
    .topbar .container{min-height:38px;display:flex;justify-content:space-between;align-items:center;gap:18px}
    .topbar a{margin-left:20px;color:#e8eff9}
    .header{position:relative;z-index:30;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{min-height:76px;display:flex;align-items:center;gap:30px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;color:var(--theme);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:center;justify-content:center;gap:4px;margin:0;padding:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:block;padding:26px 14px;color:#29364b;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 8px;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%;transform:translateX(-50%) translateY(8px);width:300px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s ease}
    .mega-menu{width:590px}
    .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:translateX(-50%) translateY(0)}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .drop-title,.mega-title{margin:0 0 12px;color:var(--theme);font-size:15px;font-weight:800}
    .drop-link{display:block;padding:8px 0;border-bottom:1px solid #edf0f5;font-size:13px;color:#435169}
    .drop-link:hover{color:var(--theme)}
    .drop-link small{display:block;color:var(--muted);font-size:11px}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
    .mega-card{display:flex;gap:10px;padding:10px;border:1px solid #edf0f5;border-radius:10px}
    .mega-card:hover{border-color:#b9cbe8;background:#f7faff}
    .mega-card img{width:34px;height:34px;object-fit:contain;flex:none}
    .mega-card strong,.mega-card small{display:block}
    .mega-card strong{font-size:13px}
    .mega-card small{font-size:11px;line-height:1.5;color:var(--muted)}
    .mega-footer{display:block;margin-top:15px;padding-top:12px;border-top:1px solid var(--line);color:var(--theme);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:8px;white-space:nowrap}
    .member-btn,.open-btn{padding:8px 13px;border-radius:8px;font-size:13px}
    .member-btn{color:var(--theme);border:1px solid #c8d6ea}
    .open-btn{color:#fff;background:var(--theme)}
    .hamburger{display:none;width:42px;height:38px;padding:8px;border:1px solid var(--line);border-radius:8px;background:#fff;cursor:pointer}
    .hamburger span{display:block;height:2px;margin:4px 0;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{position:fixed;inset:0;background:rgba(10,22,42,.48);opacity:0;visibility:hidden;transition:.2s;z-index:40}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:0;width:min(360px,88vw);height:100vh;overflow:auto;background:#fff;transform:translateX(100%);transition:.25s;z-index:50;box-shadow:-10px 0 30px 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);color:var(--theme);font-weight:700}
    .drawer-head>a{margin-left:auto;color:var(--theme);font-size:13px}
    .drawer-close{border:0;background:none;color:#667085;font-size:28px;line-height:1;cursor:pointer}
    .drawer-menu{padding:12px 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:#27344a;cursor:pointer}
    .drawer-group .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:18px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:4px 0 7px 14px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:13px}
    .footer{margin-top:70px;background:#14243d;color:#c5d1e2}
    .footer .container{padding:46px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.35fr 1fr 1fr 1fr;gap:34px}
    .footer h3,.footer h4{margin:0 0 15px;color:#fff}
    .footer h3{font-size:20px}
    .footer h4{font-size:14px}
    .footer p{margin:7px 0;font-size:13px;color:#aebdd0}
    .footer-grid>div>a{display:block;margin:7px 0;color:#aebdd0;font-size:13px}
    .footer-grid>div>a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:35px;padding-top:18px;border-top:1px solid rgba(255,255,255,.13);font-size:12px;color:#91a3ba}

    .video-page{padding:64px 0 0}
    .video-heading{text-align:center;max-width:760px;margin:0 auto 38px}
    .video-heading .eyebrow{display:inline-block;padding:5px 13px;border-radius:30px;background:#e7eef9;color:var(--theme);font-size:12px;font-weight:700;letter-spacing:1px}
    .video-heading h1{margin:14px 0 10px;font-size:clamp(30px,5vw,48px);line-height:1.2;color:#172d51}
    .video-heading p{margin:0;color:var(--muted);font-size:15px}
    .video-filter{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin:0 auto 34px}
    .video-filter a{padding:8px 16px;border:1px solid #d8e1ee;border-radius:30px;background:#fff;color:#52627a;font-size:13px}
    .video-filter a:hover,.video-filter a.active{border-color:var(--theme);background:var(--theme);color:#fff}
    .video-list{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
    .video-card{overflow:hidden;background:#fff;border:1px solid #e3e9f1;border-radius:var(--radius);box-shadow:0 8px 25px rgba(23,45,81,.05);transition:.2s}
    .video-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
    .video-cover{position:relative;aspect-ratio:16/9;background:#dfe7f2;overflow:hidden}
    .video-cover img{width:100%;height:100%;object-fit:cover}
    .video-cover:after{content:"播放";position:absolute;left:50%;top:50%;display:grid;place-items:center;width:48px;height:48px;transform:translate(-50%,-50%);border-radius:50%;background:rgba(11,61,145,.9);color:#fff;font-size:12px;opacity:.95}
    .video-duration{position:absolute;right:10px;bottom:10px;padding:2px 7px;border-radius:4px;background:rgba(0,0,0,.7);color:#fff;font-size:11px}
    .video-body{padding:18px}
    .video-body h2{margin:0 0 8px;font-size:17px;line-height:1.45;color:#1d3150}
    .video-body h2 a:hover{color:var(--theme)}
    .video-summary{display:-webkit-box;min-height:48px;margin:0 0 14px;overflow:hidden;color:var(--muted);font-size:13px;-webkit-box-orient:vertical;-webkit-line-clamp:2}
    .video-meta{display:flex;justify-content:space-between;gap:10px;padding-top:12px;border-top:1px solid #edf0f5;color:#8994a5;font-size:12px}
    .pagination{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin-top:42px}
    .pagination a{min-width:36px;padding:6px 11px;border:1px solid #d9e2ee;border-radius:7px;background:#fff;text-align:center;color:#55657c;font-size:13px}
    .pagination a:hover,.pagination a.current,.pagination a.active{border-color:var(--theme);background:var(--theme);color:#fff}
    @media (max-width:980px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-btns{margin-left:auto}
      .video-list{grid-template-columns:repeat(2,1fr)}
    }
    @media (max-width:640px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{align-items:flex-start;flex-direction:column;gap:0;padding:8px 0}
      .topbar a{margin:0 14px 0 0}
      .logo{min-width:0}
      .logo span{max-width:130px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
      .member-btn,.open-btn{display:none}
      .video-page{padding-top:42px}
      .video-list{grid-template-columns:1fr}
      .footer-grid{grid-template-columns:1fr 1fr;gap:25px}
      .footer-bottom{align-items:flex-start;flex-direction:column}
    }
    @media (max-width:420px){
      .footer-grid{grid-template-columns:1fr}
      .mega-menu{width:calc(100vw - 28px)}
    }