:root{
      --theme:#0B3D91;
      --theme-dark:#072b68;
      --theme-soft:#eaf1fb;
      --ink:#172033;
      --muted:#657086;
      --line:#dce3ec;
      --surface:#fff;
      --page:#f4f7fa;
      --accent:#91aa76;
      --rock:#59615e;
      --mist:#f7f8f5;
      --radius:18px;
      --shadow:0 18px 50px rgba(18,38,65,.1);
      --container:1200px;
    }

    *{
      box-sizing:border-box;
    }

    html{
      scroll-behavior:smooth;
    }

    body{
      margin:0;
      color:var(--ink);
      background:var(--page);
      font-family:"Microsoft YaHei","PingFang SC","Noto Sans SC",Arial,sans-serif;
      line-height:1.7;
    }

    body,
    button,
    input{
      font:inherit;
    }

    img{
      display:block;
      max-width:100%;
    }

    a{
      color:inherit;
      text-decoration:none;
    }

    button{
      color:inherit;
    }

    .container{
      width:min(var(--container),calc(100% - 40px));
      margin:0 auto;
    }

    .topbar{
      position:relative;
      z-index:110;
      color:#dbe7fa;
      background:#061d43;
      font-size:13px;
    }

    .topbar .container{
      min-height:38px;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:20px;
    }

    .topbar-links{
      display:flex;
      align-items:center;
      gap:22px;
    }

    .topbar a{
      transition:color .2s ease;
    }

    .topbar a:hover{
      color:#fff;
    }

    .header{
      position:relative;
      z-index:100;
      background:rgba(255,255,255,.98);
      border-bottom:1px solid var(--line);
      box-shadow:0 6px 20px rgba(17,38,68,.04);
    }

    .header-inner{
      min-height:78px;
      display:flex;
      align-items:center;
      gap:24px;
    }

    .logo{
      min-width:190px;
      display:flex;
      align-items:center;
      gap:11px;
      font-size:19px;
      font-weight:800;
      color:var(--theme-dark);
    }

    .logo img{
      width:42px;
      height:42px;
      object-fit:contain;
    }

    .main-nav{
      flex:1;
      align-self:stretch;
    }

    .nav-list{
      height:100%;
      margin:0;
      padding:0;
      display:flex;
      align-items:stretch;
      justify-content:center;
      list-style:none;
    }

    .nav-item{
      position:relative;
      display:flex;
      align-items:stretch;
    }

    .nav-link{
      position:relative;
      padding:0 14px;
      display:flex;
      align-items:center;
      justify-content:center;
      color:#263248;
      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);
    }

    .nav-link::after{
      content:"";
      position:absolute;
      right:14px;
      bottom:0;
      left:14px;
      height:3px;
      border-radius:3px 3px 0 0;
      background:var(--theme);
      opacity:0;
      transform:scaleX(.45);
      transition:.2s ease;
    }

    .nav-link:hover::after,
    .nav-item:focus-within > .nav-link::after{
      opacity:1;
      transform:scaleX(1);
    }

    .nav-link.has-arrow{
      padding-right:28px;
    }

    .nav-link.has-arrow::before{
      content:"";
      position:absolute;
      top:50%;
      right:13px;
      width:6px;
      height:6px;
      border-right:1.5px solid currentColor;
      border-bottom:1.5px solid currentColor;
      transform:translateY(-70%) rotate(45deg);
    }

    .dropdown-panel,
    .mega-menu{
      position:absolute;
      top:100%;
      left:50%;
      z-index:120;
      visibility:hidden;
      opacity:0;
      pointer-events:none;
      transform:translate(-50%,10px);
      transition:opacity .18s ease,transform .18s ease,visibility .18s ease;
      background:#fff;
      border:1px solid var(--line);
      border-radius:0 0 18px 18px;
      box-shadow:0 25px 60px rgba(10,31,61,.16);
    }

    .dropdown-panel::before,
    .mega-menu::before{
      content:"";
      position:absolute;
      right:0;
      bottom:100%;
      left:0;
      height:8px;
    }

    .nav-item:hover > .dropdown-panel,
    .nav-item:hover > .mega-menu,
    .nav-item:focus-within > .dropdown-panel,
    .nav-item:focus-within > .mega-menu{
      visibility:visible;
      opacity:1;
      pointer-events:auto;
      transform:translate(-50%,0);
    }

    .dropdown-panel{
      width:340px;
      padding:22px;
    }

    .dropdown-title,
    .mega-heading{
      margin:0 0 14px;
      color:var(--theme-dark);
      font-weight:800;
    }

    .dropdown-list{
      display:flex;
      flex-wrap:wrap;
      gap:8px;
    }

    .dropdown-list a{
      padding:8px 11px;
      color:#40506a;
      background:#f3f6fa;
      border:1px solid #e5eaf1;
      border-radius:9px;
      font-size:13px;
      line-height:1.35;
      transition:.2s ease;
    }

    .dropdown-list a:hover{
      color:#fff;
      background:var(--theme);
      border-color:var(--theme);
    }

    .mega-menu{
      width:min(900px,calc(100vw - 40px));
      padding:24px;
    }

    .nav-item:nth-last-child(-n+3) .mega-menu{
      left:auto;
      right:-80px;
      transform:translateY(10px);
    }

    .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-grid{
      display:grid;
      grid-template-columns:repeat(3,minmax(0,1fr));
      gap:12px;
    }

    .mega-card{
      min-width:0;
      min-height:112px;
      padding:13px;
      display:grid;
      grid-template-columns:52px minmax(0,1fr);
      grid-template-rows:auto auto auto;
      align-content:center;
      column-gap:12px;
      color:#28364d;
      background:#f7f9fc;
      border:1px solid #e3e9f1;
      border-radius:13px;
      transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
    }

    .mega-card:hover{
      transform:translateY(-2px);
      border-color:#b9c9e3;
      box-shadow:0 10px 24px rgba(11,61,145,.1);
    }

    .mega-card img{
      grid-row:1 / 4;
      width:52px;
      height:52px;
      align-self:center;
      object-fit:contain;
      background:#fff;
      border-radius:10px;
    }

    .mega-card strong,
    .mega-card small{
      min-width:0;
      overflow:hidden;
      text-overflow:ellipsis;
    }

    .mega-card strong{
      white-space:nowrap;
      font-size:14px;
    }

    .mega-card small{
      display:block;
      color:var(--muted);
      font-size:12px;
      line-height:1.45;
    }

    .mega-footer{
      margin-top:17px;
      padding-top:14px;
      display:block;
      color:var(--theme);
      border-top:1px solid var(--line);
      text-align:right;
      font-size:14px;
      font-weight:800;
    }

    .header-btns{
      display:flex;
      align-items:center;
      gap:9px;
      white-space:nowrap;
    }

    .member-link,
    .open-account{
      min-height:40px;
      padding:8px 15px;
      display:inline-flex;
      align-items:center;
      justify-content:center;
      border-radius:10px;
      font-size:14px;
      font-weight:750;
    }

    .member-link{
      color:var(--theme);
      background:var(--theme-soft);
      border:1px solid #c9d8ee;
    }

    .open-account{
      color:#fff;
      background:var(--theme);
      border:1px solid var(--theme);
      box-shadow:0 8px 18px rgba(11,61,145,.2);
    }

    .hamburger{
      width:42px;
      height:42px;
      padding:9px;
      display:none;
      flex-direction:column;
      align-items:center;
      justify-content:center;
      gap:5px;
      background:#fff;
      border:1px solid var(--line);
      border-radius:10px;
      cursor:pointer;
    }

    .hamburger span{
      width:21px;
      height:2px;
      display:block;
      background:var(--theme-dark);
      border-radius:4px;
      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:200;
      visibility:hidden;
      opacity:0;
      background:rgba(4,18,39,.58);
      backdrop-filter:blur(2px);
      transition:.25s ease;
    }

    .drawer-overlay.open{
      visibility:visible;
      opacity:1;
    }

    .mobile-drawer{
      position:fixed;
      top:0;
      right:0;
      z-index:210;
      width:min(390px,92vw);
      height:100vh;
      visibility:hidden;
      overflow-y:auto;
      background:#fff;
      box-shadow:-20px 0 60px rgba(7,25,52,.22);
      transform:translateX(100%);
      transition:transform .28s ease,visibility .28s ease;
    }

    .mobile-drawer.open{
      visibility:visible;
      transform:translateX(0);
    }

    .drawer-head{
      min-height:76px;
      padding:16px 18px;
      display:flex;
      align-items:center;
      gap:11px;
      color:#fff;
      background:var(--theme-dark);
    }

    .drawer-head > a{
      padding:7px 11px;
      border:1px solid rgba(255,255,255,.38);
      border-radius:8px;
    }

    .drawer-close{
      width:39px;
      height:39px;
      margin-left:auto;
      color:#fff;
      background:rgba(255,255,255,.12);
      border:0;
      border-radius:10px;
      font-size:27px;
      line-height:1;
      cursor:pointer;
    }

    .drawer-menu{
      padding:12px 18px 28px;
    }

    .drawer-link,
    .drawer-toggle{
      width:100%;
      min-height:50px;
      padding:12px 4px;
      display:flex;
      align-items:center;
      border:0;
      border-bottom:1px solid var(--line);
      background:transparent;
      color:#243147;
      text-align:left;
      font-weight:750;
      cursor:pointer;
    }

    .drawer-toggle{
      position:relative;
    }

    .drawer-toggle::after{
      content:"+";
      position:absolute;
      right:5px;
      color:var(--theme);
      font-size:21px;
      font-weight:400;
    }

    .drawer-toggle.active::after{
      content:"−";
    }

    .drawer-submenu{
      max-height:0;
      overflow:hidden;
      padding:0 8px;
      background:#f6f8fb;
      border-radius:0 0 10px 10px;
      transition:max-height .3s ease,padding .3s ease;
    }

    .drawer-submenu.open{
      max-height:800px;
      padding:8px;
    }

    .drawer-submenu a{
      padding:9px 10px;
      display:block;
      color:#536078;
      border-bottom:1px dashed #dce2ea;
      font-size:14px;
    }

    .drawer-submenu a:last-child{
      border-bottom:0;
    }

    .video-page{
      min-height:650px;
    }

    .video-page .video-masthead{
      position:relative;
      overflow:hidden;
      padding:76px 0 70px;
      color:#fff;
      background:
        radial-gradient(circle at 16% 20%,rgba(145,170,118,.35),transparent 27%),
        radial-gradient(circle at 88% 72%,rgba(121,134,129,.28),transparent 30%),
        linear-gradient(145deg,#142d29 0%,#253d35 45%,#37443f 100%);
    }

    .video-page .video-masthead::before,
    .video-page .video-masthead::after{
      content:"";
      position:absolute;
      inset:auto -8% -120px;
      height:270px;
      border:1px solid rgba(241,245,239,.2);
      border-radius:50%;
      transform:rotate(-4deg);
    }

    .video-page .video-masthead::after{
      inset:auto -2% -165px;
      border-width:24px;
      border-color:rgba(241,245,239,.07);
      transform:rotate(3deg);
    }

    .video-page .masthead-content{
      position:relative;
      z-index:1;
      max-width:820px;
      margin:auto;
      text-align:center;
    }

    .video-page .eyebrow{
      margin:0 0 12px;
      color:#d8e3ce;
      font-size:13px;
      font-weight:800;
      letter-spacing:.18em;
    }

    .video-page .video-masthead h1{
      margin:0;
      font-size:clamp(34px,5vw,58px);
      line-height:1.18;
      letter-spacing:-.035em;
    }

    .video-page .video-masthead p{
      max-width:720px;
      margin:19px auto 0;
      color:#e2e9e4;
      font-size:17px;
    }

    .video-page .masthead-notes{
      margin-top:27px;
      display:flex;
      flex-wrap:wrap;
      justify-content:center;
      gap:10px;
    }

    .video-page .masthead-notes span{
      padding:7px 13px;
      color:#f2f5f1;
      background:rgba(255,255,255,.09);
      border:1px solid rgba(255,255,255,.18);
      border-radius:999px;
      font-size:13px;
    }

    .video-page .category-section{
      position:relative;
      z-index:2;
      margin-top:-27px;
    }

    .video-page .category-bar{
      padding:17px;
      display:flex;
      align-items:center;
      gap:12px;
      background:#fff;
      border:1px solid var(--line);
      border-radius:17px;
      box-shadow:var(--shadow);
    }

    .video-page .category-label{
      flex:0 0 auto;
      padding:8px 12px;
      color:var(--theme-dark);
      font-size:14px;
      font-weight:800;
    }

    .video-page .category-links{
      display:flex;
      flex-wrap:wrap;
      gap:9px;
    }

    .video-page .category-links a{
      padding:8px 14px;
      color:#47546a;
      background:#f4f6f8;
      border:1px solid #e0e5ea;
      border-radius:999px;
      font-size:14px;
      transition:.2s ease;
    }

    .video-page .category-links a:hover{
      color:#fff;
      background:var(--theme);
      border-color:var(--theme);
      transform:translateY(-1px);
    }

    .video-page .video-library{
      padding:62px 0 82px;
    }

    .video-page .section-head{
      margin-bottom:25px;
      display:flex;
      align-items:end;
      justify-content:space-between;
      gap:24px;
    }

    .video-page .section-head small{
      display:block;
      margin-bottom:5px;
      color:var(--theme);
      font-weight:800;
    }

    .video-page .section-head h2{
      margin:0;
      color:#1b2739;
      font-size:31px;
      line-height:1.25;
    }

    .video-page .section-head p{
      max-width:530px;
      margin:0;
      color:var(--muted);
      font-size:14px;
      text-align:right;
    }

    .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;
      display:flex;
      flex-direction:column;
      background:#fff;
      border:1px solid var(--line);
      border-radius:var(--radius);
      box-shadow:0 10px 30px rgba(19,38,65,.06);
      transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
    }

    .video-page .video-card:hover{
      transform:translateY(-6px);
      border-color:#b9c8dd;
      box-shadow:0 22px 42px rgba(12,43,86,.13);
    }

    .video-page .video-cover{
      position:relative;
      overflow:hidden;
      aspect-ratio:16 / 9;
      background:linear-gradient(145deg,#243936,#69766f);
    }

    .video-page .video-cover img{
      width:100%;
      height:100%;
      object-fit:cover;
      transition:transform .35s ease;
    }

    .video-page .video-card:hover .video-cover img{
      transform:scale(1.045);
    }

    .video-page .play-mark{
      position:absolute;
      top:50%;
      left:50%;
      width:56px;
      height:56px;
      display:grid;
      place-items:center;
      color:#fff;
      background:rgba(11,61,145,.92);
      border:5px solid rgba(255,255,255,.25);
      border-radius:50%;
      box-shadow:0 9px 28px rgba(0,0,0,.25);
      transform:translate(-50%,-50%);
    }

    .video-page .play-mark::before{
      content:"";
      margin-left:4px;
      border-top:8px solid transparent;
      border-bottom:8px solid transparent;
      border-left:13px solid currentColor;
    }

    .video-page .duration{
      position:absolute;
      right:10px;
      bottom:10px;
      padding:4px 8px;
      color:#fff;
      background:rgba(9,16,25,.82);
      border-radius:6px;
      font-size:12px;
      line-height:1.3;
    }

    .video-page .video-card-body{
      min-width:0;
      padding:19px 19px 20px;
      display:flex;
      flex:1;
      flex-direction:column;
    }

    .video-page .card-category{
      margin-bottom:8px;
      color:var(--theme);
      font-size:12px;
      font-weight:800;
    }

    .video-page .video-card h3{
      margin:0;
      color:#202c40;
      font-size:19px;
      line-height:1.45;
    }

    .video-page .video-card h3 a:hover{
      color:var(--theme);
    }

    .video-page .video-summary{
      margin:11px 0 18px;
      display:-webkit-box;
      overflow:hidden;
      color:var(--muted);
      font-size:14px;
      line-height:1.75;
      -webkit-box-orient:vertical;
      -webkit-line-clamp:3;
    }

    .video-page .watch-link{
      margin-top:auto;
      display:inline-flex;
      align-items:center;
      gap:8px;
      color:var(--theme);
      font-size:14px;
      font-weight:800;
    }

    .video-page .watch-link::after{
      content:"→";
      transition:transform .2s ease;
    }

    .video-page .watch-link:hover::after{
      transform:translateX(4px);
    }

    .video-page .pagination{
      margin-top:42px;
      display:flex;
      flex-wrap:wrap;
      align-items:center;
      justify-content:center;
      gap:8px;
    }

    .video-page .pagination a{
      min-width:42px;
      min-height:42px;
      padding:8px 13px;
      display:inline-flex;
      align-items:center;
      justify-content:center;
      color:#46536a;
      background:#fff;
      border:1px solid var(--line);
      border-radius:10px;
      font-size:14px;
      font-weight:700;
      transition:.2s ease;
    }

    .video-page .pagination a:hover,
    .video-page .pagination a.active,
    .video-page .pagination a.current{
      color:#fff;
      background:var(--theme);
      border-color:var(--theme);
      box-shadow:0 8px 18px rgba(11,61,145,.18);
    }

    .video-page .learning-note{
      margin-top:58px;
      padding:30px;
      display:grid;
      grid-template-columns:minmax(0,1fr) auto;
      align-items:center;
      gap:28px;
      color:#eef5f1;
      background:linear-gradient(125deg,#263b35,#4a5651);
      border-radius:21px;
      box-shadow:var(--shadow);
    }

    .video-page .learning-note h2{
      margin:0 0 8px;
      font-size:25px;
    }

    .video-page .learning-note p{
      margin:0;
      color:#d8e1dc;
      font-size:14px;
    }

    .video-page .note-link{
      padding:11px 18px;
      color:var(--theme-dark);
      background:#f4f7f2;
      border-radius:10px;
      font-weight:800;
      white-space:nowrap;
    }

    .footer{
      color:#cbd5e5;
      background:#071a38;
    }

    .footer .container{
      padding-top:54px;
    }

    .footer-grid{
      display:grid;
      grid-template-columns:1.35fr 1fr 1fr 1fr;
      gap:38px;
    }

    .footer h3{
      margin:0 0 16px;
      color:#fff;
      font-size:17px;
    }

    .footer p{
      margin:7px 0;
      color:#aebbd0;
      font-size:14px;
    }

    .footer a{
      transition:color .2s ease;
    }

    .footer a:hover{
      color:#fff;
    }

    .footer-links{
      display:flex;
      flex-direction:column;
      align-items:flex-start;
      gap:9px;
      color:#b9c5d7;
      font-size:14px;
    }

    .footer-bottom{
      margin-top:42px;
      padding:20px 0 24px;
      color:#91a1ba;
      border-top:1px solid rgba(255,255,255,.11);
      text-align:center;
      font-size:13px;
    }

    @media (max-width:1120px){
      .main-nav{
        display:none;
      }

      .hamburger{
        display:flex;
      }

      .header-inner{
        justify-content:space-between;
      }

      .header-btns{
        margin-left:auto;
      }

      .video-page .video-grid{
        grid-template-columns:repeat(2,minmax(0,1fr));
      }
    }

    @media (max-width:820px){
      .topbar .container{
        padding:8px 0;
        align-items:flex-start;
        flex-direction:column;
        gap:2px;
      }

      .topbar-links{
        flex-wrap:wrap;
        gap:4px 15px;
      }

      .video-page .video-masthead{
        padding:58px 0 62px;
      }

      .video-page .category-bar{
        align-items:flex-start;
        flex-direction:column;
      }

      .video-page .section-head{
        align-items:flex-start;
        flex-direction:column;
        gap:10px;
      }

      .video-page .section-head p{
        text-align:left;
      }

      .video-page .learning-note{
        grid-template-columns:1fr;
      }

      .video-page .note-link{
        justify-self:start;
      }

      .footer-grid{
        grid-template-columns:repeat(2,minmax(0,1fr));
      }
    }

    @media (max-width:620px){
      .container{
        width:min(100% - 28px,var(--container));
      }

      .header-inner{
        min-height:68px;
        gap:10px;
      }

      .logo{
        min-width:0;
        font-size:16px;
      }

      .logo img{
        width:36px;
        height:36px;
      }

      .member-link,
      .open-account{
        display:none;
      }

      .video-page .video-masthead h1{
        font-size:34px;
      }

      .video-page .video-masthead p{
        font-size:15px;
      }

      .video-page .video-library{
        padding:50px 0 65px;
      }

      .video-page .video-grid{
        grid-template-columns:1fr;
      }

      .video-page .section-head h2{
        font-size:26px;
      }

      .video-page .learning-note{
        padding:24px 21px;
      }

      .footer-grid{
        grid-template-columns:1fr;
        gap:28px;
      }

      .footer .container{
        padding-top:43px;
      }
    }