:root{
      --theme:#0B3D91;
      --template-theme:{主题色};
      --theme-dark:#072b68;
      --theme-soft:#eaf1fb;
      --ink:#162033;
      --muted:#667085;
      --line:#e5eaf1;
      --surface:#ffffff;
      --page:#f5f7fa;
      --success:#15803d;
      --radius:16px;
      --shadow:0 16px 42px rgba(15,35,68,.10);
    }

    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      color:var(--ink);
      background:var(--page);
      font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC","Noto Sans SC",Arial,sans-serif;
      line-height:1.6;
      -webkit-font-smoothing:antialiased;
    }
    body.drawer-locked{overflow:hidden}
    img{display:block;max-width:100%}
    a{color:inherit;text-decoration:none}
    button,input{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}

    .topbar{
      color:#dbe7fb;
      background:#071d42;
      font-size:13px;
    }
    .topbar-inner{
      min-height:36px;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:20px;
    }
    .topbar-contact{display:flex;align-items:center;gap:20px}
    .topbar a{transition:color .2s ease}
    .topbar a:hover{color:#fff}

    .header{
      position:sticky;
      top:0;
      z-index:100;
      background:rgba(255,255,255,.97);
      border-bottom:1px solid var(--line);
      backdrop-filter:blur(14px);
    }
    .header-inner{
      min-height:76px;
      display:flex;
      align-items:center;
      gap:28px;
    }
    .logo{
      min-width:0;
      display:inline-flex;
      align-items:center;
      gap:10px;
      color:var(--theme-dark);
      font-weight:800;
    }
    .logo img{
      width:42px;
      height:42px;
      object-fit:contain;
      border-radius:10px;
    }
    .logo span{
      max-width:170px;
      overflow:hidden;
      white-space:nowrap;
      text-overflow:ellipsis;
    }

    .main-nav{margin-left:auto;height:76px}
    .nav-list{
      height:100%;
      display:flex;
      align-items:stretch;
      gap:2px;
      margin:0;
      padding:0;
      list-style:none;
    }
    .nav-item{
      position:relative;
      display:flex;
      align-items:center;
    }
    .nav-link{
      height:100%;
      display:flex;
      align-items:center;
      padding:0 13px;
      color:#344054;
      font-size:15px;
      font-weight:650;
      white-space:nowrap;
      transition:color .2s ease,background .2s ease;
    }
    .nav-link:hover,.nav-item:focus-within>.nav-link{
      color:var(--theme);
      background:var(--theme-soft);
    }
    .has-arrow::after{
      content:"";
      width:6px;
      height:6px;
      margin:0 0 4px 8px;
      border-right:1.5px solid currentColor;
      border-bottom:1.5px solid currentColor;
      transform:rotate(45deg);
    }

    .dropdown-panel,.mega-menu{
      position:absolute;
      top:100%;
      z-index:130;
      visibility:hidden;
      opacity:0;
      pointer-events:none;
      transform:translateY(8px);
      background:#fff;
      border:1px solid var(--line);
      border-radius:0 0 16px 16px;
      box-shadow:var(--shadow);
      transition:opacity .18s ease,transform .18s ease,visibility .18s;
    }
    .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;
      pointer-events:auto;
      transform:translateY(0);
    }
    .dropdown-panel{
      left:0;
      width:310px;
      padding:12px;
    }
    .dropdown-panel>a:not(.dropdown-footer){
      display:block;
      padding:10px 12px;
      overflow:hidden;
      color:#344054;
      white-space:nowrap;
      text-overflow:ellipsis;
      border-radius:9px;
    }
    .dropdown-panel>a:not(.dropdown-footer):hover{color:var(--theme);background:var(--theme-soft)}
    .dropdown-footer,.mega-footer{
      display:block;
      margin-top:8px;
      padding:11px 14px;
      color:var(--theme);
      background:var(--theme-soft);
      border-radius:10px;
      text-align:center;
      font-weight:750;
    }
    .mega-menu{
      left:50%;
      width:min(940px,92vw);
      padding:22px;
      transform:translate(-50%,8px);
    }
    .nav-item:hover>.mega-menu,.nav-item:focus-within>.mega-menu{transform:translate(-50%,0)}
    .nav-item:nth-last-child(-n+3)>.mega-menu{
      left:auto;
      right:-130px;
      transform:translateY(8px);
    }
    .nav-item:nth-last-child(-n+3):hover>.mega-menu,
    .nav-item:nth-last-child(-n+3):focus-within>.mega-menu{transform:translateY(0)}
    .mega-title{
      margin:0 0 13px;
      color:#101828;
      font-size:15px;
      font-weight:800;
    }
    .mega-category-list{
      display:flex;
      flex-wrap:wrap;
      gap:8px;
      margin-bottom:16px;
    }
    .mega-category-list a{
      padding:7px 12px;
      color:#475467;
      background:#f2f4f7;
      border-radius:999px;
      font-size:13px;
    }
    .mega-category-list a:hover{color:#fff;background:var(--theme)}
    .mega-grid{display:grid;gap:12px}
    .mega-grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}
    .mega-card{
      min-width:0;
      display:flex;
      align-items:flex-start;
      gap:11px;
      padding:12px;
      border:1px solid var(--line);
      border-radius:12px;
      transition:border-color .2s ease,transform .2s ease,box-shadow .2s ease;
    }
    .mega-card:hover{
      transform:translateY(-2px);
      border-color:#b9ccef;
      box-shadow:0 8px 20px rgba(11,61,145,.08);
    }
    .mega-card>img{
      flex:0 0 48px;
      width:48px;
      height:48px;
      object-fit:cover;
      background:#f2f4f7;
      border-radius:9px;
    }
    .mega-card>span{min-width:0;display:block}
    .mega-card strong,.mega-card small{
      display:block;
      overflow:hidden;
      text-overflow:ellipsis;
    }
    .mega-card strong{
      color:#1d2939;
      white-space:nowrap;
      font-size:14px;
    }
    .mega-card small{
      margin-top:3px;
      color:var(--muted);
      white-space:nowrap;
      font-size:12px;
    }
    .mega-meta{
      display:flex!important;
      flex-wrap:wrap;
      gap:4px 8px;
      margin-top:5px;
      color:#667085;
      font-size:11px;
    }

    .header-btns{
      display:flex;
      align-items:center;
      gap:10px;
      white-space:nowrap;
    }
    .account-entry{color:var(--theme);font-size:14px;font-weight:700}
    .open-account{
      padding:9px 16px;
      color:#fff;
      background:var(--theme);
      border-radius:9px;
      font-size:14px;
      font-weight:750;
      transition:background .2s ease,transform .2s ease;
    }
    .open-account:hover{background:var(--theme-dark);transform:translateY(-1px)}
    .hamburger{
      width:42px;
      height:42px;
      display:none;
      align-items:center;
      justify-content:center;
      flex-direction:column;
      gap:5px;
      padding:0;
      background:#fff;
      border:1px solid var(--line);
      border-radius:10px;
      cursor:pointer;
    }
    .hamburger span{
      width:20px;
      height:2px;
      background:#1d2939;
      border-radius:2px;
      transition:transform .2s ease,opacity .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:190;
      visibility:hidden;
      opacity:0;
      background:rgba(4,15,35,.58);
      transition:opacity .25s ease,visibility .25s ease;
    }
    .drawer-overlay.open{visibility:visible;opacity:1}
    .mobile-drawer{
      position:fixed;
      top:0;
      right:0;
      z-index:200;
      width:min(390px,90vw);
      height:100dvh;
      overflow-y:auto;
      background:#fff;
      box-shadow:-20px 0 50px rgba(0,0,0,.18);
      transform:translateX(105%);
      transition:transform .25s ease;
    }
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{
      min-height:72px;
      display:flex;
      align-items:center;
      gap:12px;
      padding:14px 18px;
      color:var(--theme);
      border-bottom:1px solid var(--line);
      font-weight:700;
    }
    .drawer-head>a{
      margin-left:auto;
      padding:7px 13px;
      color:#fff;
      background:var(--theme);
      border-radius:8px;
    }
    .drawer-close{
      width:36px;
      height:36px;
      padding:0;
      color:#344054;
      background:#f2f4f7;
      border:0;
      border-radius:9px;
      font-size:25px;
      cursor:pointer;
    }
    .drawer-menu{padding:12px 18px 30px}
    .drawer-link,.drawer-toggle{
      width:100%;
      display:flex;
      align-items:center;
      justify-content:space-between;
      padding:14px 4px;
      color:#1d2939;
      background:none;
      border:0;
      border-bottom:1px solid var(--line);
      text-align:left;
      font-weight:700;
      cursor:pointer;
    }
    .drawer-toggle::after{
      content:"+";
      color:var(--theme);
      font-size:20px;
      font-weight:400;
    }
    .drawer-toggle.active::after{content:"−"}
    .drawer-submenu{
      display:none;
      padding:7px 0 9px 14px;
      border-bottom:1px solid var(--line);
    }
    .drawer-submenu.open{display:block}
    .drawer-submenu a{
      display:block;
      padding:9px 8px;
      color:#667085;
      border-radius:7px;
      font-size:14px;
    }
    .drawer-submenu a:hover{color:var(--theme);background:var(--theme-soft)}

    .video-page{min-height:650px}
    .video-page .video-heading{
      position:relative;
      overflow:hidden;
      padding:74px 0 64px;
      color:#fff;
      background:
        radial-gradient(circle at 18% 10%,rgba(87,147,255,.34),transparent 30%),
        radial-gradient(circle at 88% 84%,rgba(29,78,216,.25),transparent 32%),
        linear-gradient(135deg,#061b3e 0%,#0B3D91 58%,#08295f 100%);
    }
    .video-page .video-heading::before{
      content:"";
      position:absolute;
      inset:0;
      opacity:.14;
      background-image:linear-gradient(rgba(255,255,255,.12) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.12) 1px,transparent 1px);
      background-size:34px 34px;
      mask-image:linear-gradient(to bottom,#000,transparent);
    }
    .video-page .heading-inner{position:relative;z-index:1;text-align:center}
    .video-page .eyebrow{
      display:inline-flex;
      align-items:center;
      gap:8px;
      margin-bottom:12px;
      padding:6px 13px;
      color:#dbeafe;
      background:rgba(255,255,255,.10);
      border:1px solid rgba(255,255,255,.2);
      border-radius:999px;
      font-size:13px;
      font-weight:750;
    }
    .video-page .eyebrow::before{
      content:"";
      width:8px;
      height:8px;
      background:#60a5fa;
      border-radius:50%;
      box-shadow:0 0 0 5px rgba(96,165,250,.15);
    }
    .video-page h1{
      margin:0;
      font-size:clamp(34px,5vw,58px);
      line-height:1.16;
      letter-spacing:-1.5px;
    }
    .video-page .heading-copy{
      max-width:720px;
      margin:17px auto 0;
      color:#dbe7fb;
      font-size:17px;
    }

    .video-page .category-zone{
      position:relative;
      z-index:2;
      margin-top:-27px;
    }
    .video-page .category-panel{
      display:flex;
      align-items:center;
      gap:12px;
      padding:16px 18px;
      background:#fff;
      border:1px solid var(--line);
      border-radius:16px;
      box-shadow:var(--shadow);
    }
    .video-page .category-label{
      flex:0 0 auto;
      color:#344054;
      font-size:14px;
      font-weight:800;
    }
    .video-page .category-links{
      display:flex;
      flex-wrap:wrap;
      gap:8px;
    }
    .video-page .category-links a{
      padding:8px 13px;
      color:#475467;
      background:#f2f4f7;
      border-radius:999px;
      font-size:14px;
      transition:color .2s ease,background .2s ease;
    }
    .video-page .category-links a:hover{color:#fff;background:var(--theme)}

    .video-page .video-content{padding:58px 0 82px}
    .video-page .section-head{
      display:flex;
      align-items:end;
      justify-content:space-between;
      gap:20px;
      margin-bottom:24px;
    }
    .video-page .section-head h2{margin:0;font-size:30px;line-height:1.25}
    .video-page .section-head p{margin:6px 0 0;color:var(--muted)}
    .video-page .section-note{
      flex:0 0 auto;
      color:#667085;
      font-size:13px;
    }
    .video-page .video-grid{
      display:grid;
      grid-template-columns:repeat(3,minmax(0,1fr));
      gap:22px;
    }
    .video-page .video-card{
      min-width:0;
      overflow:hidden;
      background:#fff;
      border:1px solid var(--line);
      border-radius:var(--radius);
      box-shadow:0 8px 24px rgba(15,35,68,.05);
      transition:transform .22s ease,border-color .22s ease,box-shadow .22s ease;
    }
    .video-page .video-card:hover{
      transform:translateY(-5px);
      border-color:#b5c9ed;
      box-shadow:0 18px 36px rgba(11,61,145,.12);
    }
    .video-page .cover-link{
      position:relative;
      display:block;
      overflow:hidden;
      aspect-ratio:16/9;
      background:#dfe6f1;
    }
    .video-page .cover-link>img{
      width:100%;
      height:100%;
      object-fit:cover;
      transition:transform .35s ease;
    }
    .video-page .video-card:hover .cover-link>img{transform:scale(1.045)}
    .video-page .play-button{
      position:absolute;
      top:50%;
      left:50%;
      width:52px;
      height:52px;
      display:grid;
      place-items:center;
      color:#fff;
      background:rgba(11,61,145,.9);
      border:2px solid rgba(255,255,255,.8);
      border-radius:50%;
      transform:translate(-50%,-50%);
      box-shadow:0 8px 24px rgba(0,0,0,.25);
    }
    .video-page .play-button::before{
      content:"";
      margin-left:4px;
      border-top:8px solid transparent;
      border-bottom:8px solid transparent;
      border-left:12px solid currentColor;
    }
    .video-page .duration{
      position:absolute;
      right:10px;
      bottom:10px;
      padding:3px 8px;
      color:#fff;
      background:rgba(3,12,28,.78);
      border-radius:6px;
      font-size:12px;
      font-variant-numeric:tabular-nums;
    }
    .video-page .video-body{padding:18px}
    .video-page .video-type{
      display:inline-block;
      margin-bottom:9px;
      color:var(--theme);
      font-size:12px;
      font-weight:800;
    }
    .video-page .video-title{
      margin:0;
      font-size:18px;
      line-height:1.45;
    }
    .video-page .video-title a:hover{color:var(--theme)}
    .video-page .video-summary{
      min-height:50px;
      margin:9px 0 14px;
      overflow:hidden;
      color:var(--muted);
      display:-webkit-box;
      -webkit-box-orient:vertical;
      -webkit-line-clamp:2;
      font-size:14px;
    }
    .video-page .video-meta{
      display:flex;
      flex-wrap:wrap;
      align-items:center;
      gap:6px 12px;
      padding-top:13px;
      color:#7b8494;
      border-top:1px solid #edf0f4;
      font-size:12px;
    }
    .video-page .watch-link{
      margin-left:auto;
      color:var(--theme);
      font-weight:800;
    }

    .video-page .pagination{
      display:flex;
      flex-wrap:wrap;
      justify-content:center;
      gap:8px;
      margin-top:42px;
    }
    .video-page .pagination a{
      min-width:40px;
      height:40px;
      display:inline-flex;
      align-items:center;
      justify-content:center;
      padding:0 13px;
      color:#475467;
      background:#fff;
      border:1px solid var(--line);
      border-radius:9px;
      font-size:14px;
      font-weight:700;
    }
    .video-page .pagination a:hover,
    .video-page .pagination a.active,
    .video-page .pagination a.current{
      color:#fff;
      background:var(--theme);
      border-color:var(--theme);
    }

    .video-page .learning-note{
      margin-top:56px;
      padding:28px;
      color:#24406f;
      background:linear-gradient(135deg,#eaf1fb,#f8fbff);
      border:1px solid #cddcf3;
      border-radius:18px;
    }
    .video-page .learning-note h2{margin:0 0 7px;font-size:22px}
    .video-page .learning-note p{margin:0;color:#526680}

    .footer{
      color:#d8e1ee;
      background:#07182f;
    }
    .footer-main{padding:62px 0 42px}
    .footer-grid{
      display:grid;
      grid-template-columns:1.35fr .8fr .8fr 1.1fr;
      gap:42px;
    }
    .footer .logo{color:#fff}
    .footer-brand p{
      max-width:390px;
      margin:18px 0;
      color:#aebbd0;
      font-size:14px;
    }
    .footer-social{color:#c7d2e2;font-size:14px}
    .footer h3{margin:5px 0 16px;color:#fff;font-size:16px}
    .footer-links,.footer-contact{display:flex;flex-direction:column;gap:10px}
    .footer-links a,.footer-contact a,.footer-contact span{
      color:#aebbd0;
      font-size:14px;
      transition:color .2s ease;
    }
    .footer-links a:hover,.footer-contact a:hover{color:#fff}
    .footer-bottom{
      min-height:66px;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:20px;
      color:#8fa0b8;
      border-top:1px solid rgba(255,255,255,.1);
      font-size:13px;
    }
    .footer-bottom-links{display:flex;gap:18px}
    .footer-bottom-links a:hover{color:#fff}

    @media (max-width:1120px){
      .main-nav{display:none}
      .hamburger{display:flex}
      .header-inner{min-height:68px}
      .header-btns{margin-left:auto}
      .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
    }
    @media (max-width:850px){
      .video-page .video-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
      .video-page .category-panel{align-items:flex-start;flex-direction:column}
    }
    @media (max-width:640px){
      .container{width:min(100% - 28px,1180px)}
      .topbar-welcome{display:none}
      .topbar-inner{justify-content:center}
      .topbar-contact{width:100%;justify-content:space-between;gap:10px}
      .topbar-contact a{font-size:12px}
      .logo span{max-width:120px}
      .account-entry{display:none}
      .open-account{padding:8px 12px}
      .video-page .video-heading{padding:54px 0 52px}
      .video-page h1{font-size:34px;letter-spacing:-.5px}
      .video-page .heading-copy{font-size:15px}
      .video-page .video-content{padding:44px 0 64px}
      .video-page .section-head{align-items:flex-start;flex-direction:column}
      .video-page .section-head h2{font-size:25px}
      .video-page .video-grid{grid-template-columns:1fr}
      .video-page .video-summary{min-height:auto}
      .video-page .learning-note{padding:22px}
      .footer-main{padding-top:46px}
      .footer-grid{grid-template-columns:1fr;gap:28px}
      .footer-bottom{
        align-items:flex-start;
        flex-direction:column;
        justify-content:center;
        padding:18px 0;
      }
    }