:root{
      --theme:#0B3D91;
      --ink:#121722;
      --muted:#667085;
      --line:#e4e8ef;
      --paper:#f6f8fb;
      --white:#fff;
      --shadow:0 18px 45px rgba(18,35,65,.09);
      --radius:18px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      color:var(--ink);
      background:var(--paper);
      font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",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{
      color:#dfe9fb;
      background:#081b3b;
      font-size:13px;
      border-bottom:1px solid rgba(255,255,255,.1);
    }
    .topbar-inner{
      min-height:36px;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:18px;
    }
    .topbar-info{display:flex;gap:20px;align-items:center}
    .topbar a{color:#dfe9fb}
    .topbar a:hover{color:#fff}

    .header{
      position:relative;
      z-index:20;
      background:rgba(255,255,255,.96);
      border-bottom:1px solid var(--line);
    }
    .header-inner{
      min-height:78px;
      display:flex;
      align-items:center;
      gap:28px;
    }
    .logo{
      display:inline-flex;
      align-items:center;
      gap:10px;
      color:var(--ink);
      font-weight:800;
      font-size:19px;
      white-space:nowrap;
    }
    .logo img{
      width:38px;
      height:38px;
      object-fit:contain;
      border-radius:10px;
    }
    .main-nav{margin-left:auto}
    .nav-list{
      display:flex;
      align-items:center;
      gap:4px;
      list-style:none;
      padding:0;
      margin:0;
    }
    .nav-item{position:relative}
    .nav-link{
      display:flex;
      align-items:center;
      min-height:78px;
      padding:0 13px;
      color:#344054;
      font-size:14px;
      font-weight:600;
      white-space:nowrap;
    }
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{
      content:"";
      width:6px;
      height:6px;
      margin-left:7px;
      border-right:1px solid currentColor;
      border-bottom:1px solid currentColor;
      transform:rotate(45deg) translateY(-2px);
    }
    .dropdown-panel,.mega-menu{
      position:absolute;
      top:calc(100% - 1px);
      left:50%;
      transform:translateX(-50%) translateY(8px);
      width:310px;
      padding:18px;
      background:#fff;
      border:1px solid var(--line);
      border-radius:0 0 16px 16px;
      box-shadow:var(--shadow);
      opacity:0;
      visibility:hidden;
      pointer-events:none;
      transition:.2s ease;
    }
    .mega-menu{width:580px}
    .dropdown-panel:before,.mega-menu:before{
      content:"";
      position:absolute;
      left:0;
      right:0;
      top:-12px;
      height:12px;
    }
    .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;
      pointer-events:auto;
      transform:translateX(-50%) translateY(0);
    }
    .dropdown-panel>a:not(.mega-footer){
      display:block;
      padding:9px 10px;
      border-bottom:1px solid #f0f2f5;
      font-size:14px;
    }
    .dropdown-panel>a:hover,.mega-card:hover{color:var(--theme);background:#f5f8fd}
    .mega-heading{
      margin:0 0 13px;
      color:var(--ink);
      font-size:15px;
    }
    .mega-grid{
      display:grid;
      grid-template-columns:repeat(2,minmax(0,1fr));
      gap:8px;
      max-height:390px;
      overflow:auto;
    }
    .mega-card{
      display:flex;
      flex-direction:column;
      gap:3px;
      min-width:0;
      padding:11px;
      border:1px solid #edf0f4;
      border-radius:11px;
      transition:.2s ease;
    }
    .mega-card strong{
      overflow:hidden;
      text-overflow:ellipsis;
      white-space:nowrap;
      font-size:13px;
    }
    .mega-card small{
      color:var(--muted);
      font-size:11px;
      line-height:1.45;
    }
    .mega-card img{
      width:23px;
      height:23px;
      object-fit:contain;
      margin-bottom:2px;
    }
    .mega-footer{
      display:block;
      margin-top:13px;
      padding-top:12px;
      color:var(--theme);
      border-top:1px solid var(--line);
      font-size:13px;
      font-weight:700;
    }
    .header-btns{
      display:flex;
      align-items:center;
      gap:8px;
      white-space:nowrap;
    }
    .member-link{
      color:var(--theme);
      font-size:13px;
      font-weight:700;
    }
    .open-link{
      padding:9px 14px;
      color:#fff;
      background:var(--theme);
      border-radius:8px;
      font-size:13px;
      font-weight:700;
    }
    .hamburger{
      display:none;
      width:40px;
      height:40px;
      padding:8px;
      border:1px solid var(--line);
      border-radius:8px;
      background:#fff;
      cursor:pointer;
    }
    .hamburger span{
      display:block;
      height:2px;
      margin:5px 0;
      background:var(--ink);
      transition:.2s ease;
    }
    .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;
      inset:0;
      z-index:40;
      background:rgba(5,15,32,.52);
      opacity:0;
      visibility:hidden;
      transition:.25s ease;
    }
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{
      position:fixed;
      z-index:50;
      top:0;
      right:0;
      width:min(390px,88vw);
      height:100vh;
      overflow:auto;
      background:#fff;
      box-shadow:-15px 0 40px rgba(0,0,0,.15);
      transform:translateX(105%);
      transition:.28s ease;
    }
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{
      display:flex;
      align-items:center;
      gap:15px;
      min-height:72px;
      padding:0 20px;
      color:#fff;
      background:var(--theme);
      font-weight:700;
    }
    .drawer-head>a{margin-left:auto;color:#fff}
    .drawer-close{
      width:32px;
      height:32px;
      border:0;
      color:#fff;
      background:transparent;
      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;
      color:var(--ink);
      border:0;
      border-bottom:1px solid var(--line);
      background:transparent;
      text-align:left;
      font-weight:700;
      cursor:pointer;
    }
    .drawer-toggle:after{
      content:"+";
      float:right;
      color:var(--theme);
      font-size:20px;
      font-weight:400;
    }
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{
      display:none;
      padding:5px 0 8px 15px;
      border-bottom:1px solid var(--line);
    }
    .drawer-submenu.open{display:block}
    .drawer-submenu a{
      display:block;
      padding:8px 0;
      color:var(--muted);
      font-size:14px;
    }

    .video-page{
      padding:72px 0 90px;
      background:
        radial-gradient(circle at 10% 0%,rgba(11,61,145,.08),transparent 30%),
        var(--paper);
    }
    .video-page .page-heading{
      max-width:760px;
      margin:0 auto 34px;
      text-align:center;
    }
    .video-page .eyebrow{
      display:inline-flex;
      align-items:center;
      gap:8px;
      margin-bottom:12px;
      color:var(--theme);
      font-size:12px;
      font-weight:800;
      letter-spacing:.16em;
    }
    .video-page .eyebrow:before{
      content:"";
      width:28px;
      height:1px;
      background:var(--theme);
    }
    .video-page h1{
      margin:0;
      color:var(--ink);
      font-size:clamp(32px,5vw,58px);
      line-height:1.12;
      letter-spacing:-.045em;
    }
    .video-page .intro{
      margin:16px auto 0;
      color:var(--muted);
      font-size:16px;
    }
    .video-filter{
      display:flex;
      flex-wrap:wrap;
      justify-content:center;
      gap:9px;
      margin:0 auto 35px;
    }
    .video-filter a{
      padding:8px 15px;
      color:#475467;
      border:1px solid #dce3ed;
      border-radius:999px;
      background:#fff;
      font-size:13px;
      transition:.2s ease;
    }
    .video-filter a:hover,.video-filter a.active{
      color:#fff;
      border-color:var(--theme);
      background:var(--theme);
    }
    .video-grid{
      display:grid;
      grid-template-columns:repeat(3,minmax(0,1fr));
      gap:22px;
    }
    .video-card{
      min-width:0;
      overflow:hidden;
      border:1px solid #e8edf4;
      border-radius:var(--radius);
      background:#fff;
      box-shadow:0 8px 25px rgba(20,42,80,.045);
      transition:transform .22s ease,box-shadow .22s ease;
    }
    .video-card:hover{
      transform:translateY(-5px);
      box-shadow:var(--shadow);
    }
    .video-cover{
      position:relative;
      aspect-ratio:16/9;
      overflow:hidden;
      background:#dce5f3;
    }
    .video-cover img{
      width:100%;
      height:100%;
      object-fit:cover;
      transition:transform .35s ease;
    }
    .video-card:hover .video-cover img{transform:scale(1.04)}
    .video-cover:after{
      content:"播放";
      position:absolute;
      left:50%;
      top:50%;
      display:grid;
      width:48px;
      height:48px;
      place-items:center;
      color:#fff;
      background:rgba(11,61,145,.9);
      border:3px solid rgba(255,255,255,.72);
      border-radius:50%;
      transform:translate(-50%,-50%);
      font-size:12px;
      font-weight:700;
    }
    .video-duration{
      position:absolute;
      right:10px;
      bottom:10px;
      padding:3px 7px;
      color:#fff;
      background:rgba(7,18,38,.78);
      border-radius:5px;
      font-size:11px;
    }
    .video-body{padding:18px 18px 20px}
    .video-body h2{
      display:-webkit-box;
      overflow:hidden;
      margin:0 0 9px;
      color:var(--ink);
      font-size:18px;
      line-height:1.4;
      -webkit-box-orient:vertical;
      -webkit-line-clamp:2;
    }
    .video-summary{
      display:-webkit-box;
      overflow:hidden;
      min-height:48px;
      margin:0 0 14px;
      color:var(--muted);
      font-size:13px;
      line-height:1.8;
      -webkit-box-orient:vertical;
      -webkit-line-clamp:2;
    }
    .video-meta{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:10px;
      padding-top:12px;
      color:#98a2b3;
      border-top:1px solid #eef1f5;
      font-size:12px;
    }
    .video-meta .watch{
      color:var(--theme);
      font-weight:700;
    }
    .pagination{
      display:flex;
      justify-content:center;
      flex-wrap:wrap;
      gap:8px;
      margin-top:46px;
    }
    .pagination a{
      display:grid;
      min-width:38px;
      height:38px;
      padding:0 12px;
      place-items:center;
      color:#475467;
      border:1px solid #dce3ed;
      border-radius:8px;
      background:#fff;
      font-size:13px;
    }
    .pagination a:hover,.pagination a.active{
      color:#fff;
      border-color:var(--theme);
      background:var(--theme);
    }

    .footer{
      padding:58px 0 25px;
      color:#c8d2e1;
      background:#0a1730;
    }
    .footer-grid{
      display:grid;
      grid-template-columns:1.5fr 1fr 1fr 1.1fr;
      gap:36px;
    }
    .footer-brand{
      margin-bottom:13px;
      color:#fff;
      font-size:21px;
      font-weight:800;
    }
    .footer p{
      margin:0 0 9px;
      color:#aebbd0;
      font-size:13px;
    }
    .footer h3{
      margin:0 0 14px;
      color:#fff;
      font-size:14px;
    }
    .footer-grid>div:not(:first-child) a{
      display:block;
      margin-bottom:8px;
      color:#aebbd0;
      font-size:13px;
    }
    .footer-grid a:hover{color:#fff}
    .footer-bottom{
      display:flex;
      justify-content:space-between;
      gap:20px;
      margin-top:42px;
      padding-top:18px;
      color:#8797b0;
      border-top:1px solid rgba(255,255,255,.13);
      font-size:12px;
    }

    @media (max-width:1050px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-btns{margin-left:auto}
      .video-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
    }
    @media (max-width:700px){
      .container{width:min(100% - 28px,1180px)}
      .topbar-inner{align-items:flex-start;flex-direction:column;gap:2px;padding:8px 0}
      .topbar-info{gap:12px;flex-wrap:wrap}
      .header-inner{min-height:68px;gap:10px}
      .logo{font-size:16px}
      .logo img{width:32px;height:32px}
      .member-link{display:none}
      .open-link{padding:8px 11px}
      .video-page{padding:48px 0 65px}
      .video-page h1{font-size:38px}
      .video-page .intro{font-size:14px}
      .video-grid{grid-template-columns:1fr;gap:16px}
      .video-body{padding:16px}
      .footer{padding-top:42px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:27px 18px}
      .footer-grid>div:first-child{grid-column:1/-1}
      .footer-bottom{align-items:flex-start;flex-direction:column;gap:6px;margin-top:30px}
    }
    @media (max-width:430px){
      .footer-grid{grid-template-columns:1fr}
      .footer-grid>div:first-child{grid-column:auto}
      .video-filter{justify-content:flex-start}
    }