:root{
      --theme:#0B3D91;
      --ink:#172235;
      --muted:#718096;
      --line:#dce3ec;
      --soft:#f4f7fa;
      --orange:#f27b35;
      --white:#fff;
      --shadow:0 16px 42px rgba(20,42,72,.10);
      --radius:14px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;background:#f7f9fb;color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.7}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;vertical-align:middle}
    button{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .topbar{height:38px;background:#edf1f5;color:#637083;font-size:13px}
    .topbar .container{height:100%;display:flex;align-items:center;justify-content:space-between}
    .topbar-links{display:flex;gap:22px}
    .topbar a:hover{color:var(--theme)}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid #e6ebf1}
    .header-inner{min-height:76px;display:flex;align-items:center;gap:28px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;color:var(--theme);font-size:20px;font-weight:800;white-space:nowrap}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:stretch;justify-content:center;gap:4px;padding:0;margin:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;height:76px;padding:0 14px;color:#273449;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"";width:6px;height:6px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg);margin:0 0 4px 8px}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%);display:none;background:#fff;border:1px solid #e3e9f0;border-radius:0 0 14px 14px;box-shadow:var(--shadow);padding:18px;min-width:270px}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .dropdown-panel a{display:block;padding:9px 10px;border-radius:8px;font-size:14px}
    .dropdown-panel a:hover{background:#f1f5fa;color:var(--theme)}
    .nav-item:hover>.dropdown-panel,.nav-item:focus-within>.dropdown-panel,.nav-item:hover>.mega-menu,.nav-item:focus-within>.mega-menu{display:block}
    .mega-menu{width:650px}
    .mega-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;color:var(--theme);font-size:15px;font-weight:700}
    .mega-title a{font-size:12px;color:var(--muted);font-weight:400}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
    .mega-card{display:block;min-height:76px;padding:11px;background:#f7f9fc;border:1px solid #e5ebf2;border-radius:9px}
    .mega-card:hover{border-color:#adc1e2;background:#f0f5fd}
    .mega-card strong{display:block;color:#253449;font-size:13px;line-height:1.5}
    .mega-card small{display:block;color:#7d8998;font-size:11px;line-height:1.55;margin-top:3px}
    .mega-card img{width:24px;height:24px;object-fit:contain;margin-bottom:4px}
    .mega-footer{display:block;margin-top:16px;padding-top:13px;border-top:1px solid #edf0f4;color:var(--theme);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}
    .member-link{font-size:13px;color:var(--theme)}
    .open-account{padding:9px 15px;border-radius:7px;background:var(--theme);color:#fff;font-size:13px}
    .open-account:hover{background:#082f70}
    .hamburger{display:none;width:40px;height:38px;padding:8px;border:1px solid #dbe2eb;border-radius:7px;background:#fff;cursor:pointer}
    .hamburger span{display:block;width:21px;height:2px;margin:4px auto;background:var(--ink);transition:.2s}
    .drawer-overlay{display:none;position:fixed;z-index:40;inset:0;background:rgba(9,22,40,.48);opacity:0}
    .drawer-overlay.open{display:block;opacity:1}
    .mobile-drawer{position:fixed;z-index:41;right:-360px;top:0;width:min(360px,88vw);height:100vh;overflow:auto;background:#fff;transition:right .25s ease;box-shadow:-15px 0 35px rgba(0,0,0,.15)}
    .mobile-drawer.open{right:0}
    .drawer-head{display:flex;align-items:center;gap:15px;padding:18px 20px;border-bottom:1px solid var(--line);color:var(--theme)}
    .drawer-head strong{flex:1}
    .drawer-head a{padding:6px 11px;border-radius:6px;background:var(--theme);color:#fff;font-size:13px}
    .drawer-close{border:0;background:none;color:#607086;font-size:27px;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 #edf0f4;background:none;text-align:left;color:#26364d;cursor:pointer}
    .drawer-group{border-bottom:1px solid #edf0f4}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:20px;line-height:1}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:4px 0 9px 15px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:7px 0;color:#6b7788;font-size:13px}
    .footer{margin-top:70px;background:#142238;color:#b9c5d5}
    .footer .container{padding:54px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:38px}
    .footer-brand{margin-bottom:13px;color:#fff;font-size:22px;font-weight:800}
    .footer p{margin:7px 0;color:#aab8ca;font-size:13px}
    .footer h3{margin:3px 0 13px;color:#fff;font-size:15px}
    .footer-grid a{display:block;margin:7px 0;color:#b9c5d5;font-size:13px}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:38px;padding-top:18px;border-top:1px solid rgba(255,255,255,.13);font-size:12px;color:#8999ad}
    .video-page{padding:0 0 20px}
    .video-page .page-heading{padding:62px 0 36px;background:linear-gradient(135deg,#eef3f8 0%,#fff 68%);border-bottom:1px solid #e1e8ef}
    .heading-kicker{display:flex;align-items:center;gap:10px;margin-bottom:10px;color:var(--orange);font-size:13px;font-weight:700;letter-spacing:1px}
    .heading-kicker:before{content:"";display:block;width:28px;height:2px;background:var(--orange)}
    .page-heading h1{margin:0;color:#14243a;font-size:clamp(30px,4vw,46px);line-height:1.25;letter-spacing:-1px}
    .page-heading p{max-width:700px;margin:14px 0 0;color:#69788c;font-size:16px}
    .video-toolbar{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:28px 0 20px}
    .video-toolbar h2{margin:0;color:#23334a;font-size:22px}
    .video-toolbar .hint{color:#7b899a;font-size:13px}
    .video-category-tabs{display:flex;flex-wrap:wrap;gap:9px;margin-bottom:28px}
    .video-category-tabs a{padding:7px 15px;border:1px solid #d9e1eb;border-radius:100px;background:#fff;color:#5d6b7d;font-size:13px}
    .video-category-tabs a:hover,.video-category-tabs a.active{border-color:var(--theme);background:var(--theme);color:#fff}
    .video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
    .video-card{display:flex;flex-direction:column;min-width:0;overflow:hidden;border:1px solid #e0e7ef;border-radius:var(--radius);background:#fff;box-shadow:0 7px 22px rgba(31,52,79,.05);transition:transform .2s,box-shadow .2s}
    .video-card:hover{transform:translateY(-4px);box-shadow:0 16px 32px rgba(31,52,79,.12)}
    .video-cover{position:relative;aspect-ratio:16/9;overflow:hidden;background:#dfe7f0}
    .video-cover img{width:100%;height:100%;object-fit:cover;transition:transform .35s}
    .video-card:hover .video-cover img{transform:scale(1.04)}
    .video-cover:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 48%,rgba(8,21,40,.42))}
    .play-mark{position:absolute;z-index:1;top:50%;left:50%;display:grid;place-items:center;width:48px;height:48px;transform:translate(-50%,-50%);border:2px solid rgba(255,255,255,.85);border-radius:50%;background:rgba(11,61,145,.84);color:#fff;font-size:21px;padding-left:3px}
    .duration{position:absolute;z-index:2;right:10px;bottom:9px;padding:2px 7px;border-radius:4px;background:rgba(8,18,32,.72);color:#fff;font-size:11px}
    .video-body{display:flex;flex:1;flex-direction:column;padding:17px 18px 18px}
    .video-meta{display:flex;justify-content:space-between;gap:10px;margin-bottom:8px;color:#8a96a5;font-size:12px}
    .video-meta .category{color:var(--orange)}
    .video-title{display:-webkit-box;overflow:hidden;margin:0 0 8px;color:#20314a;font-size:17px;line-height:1.45;-webkit-box-orient:vertical;-webkit-line-clamp:2}
    .video-summary{display:-webkit-box;overflow:hidden;min-height:48px;margin:0 0 15px;color:#748195;font-size:13px;line-height:1.8;-webkit-box-orient:vertical;-webkit-line-clamp:2}
    .video-more{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:13px;border-top:1px solid #edf0f4;color:var(--theme);font-size:13px;font-weight:700}
    .video-more span:last-child{font-size:18px;transition:transform .2s}
    .video-card:hover .video-more span:last-child{transform:translateX(4px)}
    .pagination{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin:42px 0 12px}
    .pagination a{min-width:36px;padding:6px 11px;border:1px solid #dbe3ec;border-radius:6px;background:#fff;color:#647286;text-align:center;font-size:13px}
    .pagination a:hover,.pagination a.active{border-color:var(--theme);background:var(--theme);color:#fff}
    @media(max-width:1080px){
      .header-inner{gap:14px}
      .logo{min-width:160px}
      .nav-link{padding:0 8px}
      .mega-menu{width:590px}
    }
    @media(max-width:820px){
      .container{width:min(100% - 28px,680px)}
      .topbar{height:auto;padding:8px 0}
      .topbar .container{align-items:flex-start;gap:5px;flex-direction:column}
      .topbar-links{gap:14px}
      .header-inner{min-height:66px}
      .main-nav{display:none}
      .header-btns{margin-left:auto}
      .member-link{display:none}
      .hamburger{display:block}
      .video-page .page-heading{padding:42px 0 30px}
      .video-grid{grid-template-columns:repeat(2,1fr);gap:16px}
      .footer-grid{grid-template-columns:repeat(2,1fr);gap:28px}
    }
    @media(max-width:560px){
      .container{width:calc(100% - 28px)}
      .open-account{display:none}
      .page-heading h1{font-size:32px}
      .page-heading p{font-size:14px}
      .video-toolbar{align-items:flex-start;flex-direction:column;gap:5px;padding-top:22px}
      .video-grid{grid-template-columns:1fr}
      .video-body{padding:15px}
      .footer-grid{grid-template-columns:1fr;gap:22px}
      .footer{margin-top:45px}
      .footer .container{padding-top:38px}
      .footer-bottom{align-items:flex-start;flex-direction:column;gap:8px}
    }