:root{
      --theme:#0B3D91;
      --deep:#071a36;
      --ice:#eaf5ff;
      --line:#d8e7f5;
      --text:#172b4d;
      --muted:#6d7f95;
      --white:#fff;
      --shadow:0 18px 48px rgba(7,35,75,.12);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--text);background:#f5f9fd;font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.6}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block}
    .container{width:min(1180px,calc(100% - 40px));margin:auto}
    .topbar{background:var(--deep);color:#dcecff;font-size:13px}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between}
    .topbar-info{display:flex;gap:22px}
    .topbar a:hover{color:#fff}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:78px;display:flex;align-items:center;gap:32px}
    .logo{display:flex;align-items:center;gap:10px;min-width:205px;color:var(--deep);font-weight:800;font-size:20px}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{margin-left:auto}
    .nav-list{display:flex;align-items:center;gap:4px;list-style:none;margin:0;padding:0}
    .nav-item{position:relative}
    .nav-link{display:block;padding:28px 13px;color:#263c5a;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"⌄";font-size:12px;margin-left:6px;color:#71849b}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%);width:280px;padding:18px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s}
    .mega-menu{width:650px}
    .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}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;top:-12px;left:0;right:0;height:12px}
    .dropdown-panel a{display:block;padding:9px 6px;border-bottom:1px solid #edf3f8;color:#405570;font-size:14px}
    .dropdown-panel a:hover{color:var(--theme);background:var(--ice)}
    .mega-title{font-size:14px;color:var(--theme);font-weight:700;margin-bottom:12px}
    .mega-links{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:8px}
    .mega-links a{padding:6px 12px;border-radius:20px;background:var(--ice);font-size:13px;color:var(--theme)}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
    .mega-card{display:flex;gap:9px;padding:9px;border:1px solid #e2edf7;border-radius:9px;background:#fbfdff}
    .mega-card:hover{border-color:#94bce7;background:#f2f8ff}
    .mega-card img{width:38px;height:38px;object-fit:contain;border-radius:7px}
    .mega-card span{min-width:0}
    .mega-card strong,.mega-card small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .mega-card strong{font-size:13px}
    .mega-card small{font-size:11px;color:var(--muted);line-height:1.45}
    .mega-footer{display:block;margin-top:15px;padding-top:12px;border-top:1px solid var(--line);color:var(--theme);font-weight:700;font-size:13px}
    .header-btns{display:flex;align-items:center;gap:10px}
    .member-link{font-size:13px;color:var(--theme);white-space:nowrap}
    .open-account{padding:9px 16px;border-radius:7px;background:var(--theme);color:#fff;font-size:13px;white-space:nowrap}
    .hamburger{display:none;width:42px;height:38px;padding:8px;border:1px solid var(--line);border-radius:7px;background:#fff;cursor:pointer}
    .hamburger span{display:block;width:22px;height:2px;margin:4px auto;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{display:none;position:fixed;inset:0;background:rgba(4,20,42,.52);z-index:40}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;top:0;right:-360px;width:min(360px,88vw);height:100vh;overflow:auto;background:#fff;z-index:50;transition:right .25s;box-shadow:-10px 0 35px rgba(0,0,0,.18)}
    .mobile-drawer.open{right:0}
    .drawer-head{display:flex;align-items:center;gap:14px;padding:20px;border-bottom:1px solid var(--line);font-weight:700;color:var(--theme)}
    .drawer-head>a{margin-left:auto;padding:6px 12px;border-radius:5px;background:var(--theme);color:#fff;font-size:13px}
    .drawer-close{border:0;background:none;font-size:28px;color:#71849b;cursor:pointer}
    .drawer-menu{padding:10px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid #edf2f7;background:none;text-align:left;font-size:15px;color:var(--text);cursor:pointer}
    .drawer-toggle:after{content:"＋";float:right;color:var(--muted)}
    .drawer-toggle.active:after{content:"－"}
    .drawer-submenu{display:none;padding:4px 0 8px 14px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:14px}
    .footer{margin-top:70px;padding:54px 0 22px;background:var(--deep);color:#c5d6e9}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:38px}
    .footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-size:20px;font-weight:800}
    .footer-brand img{width:36px;height:36px;object-fit:contain}
    .footer p{max-width:320px;margin:18px 0 0;color:#91a8c2;font-size:13px}
    .footer h3{margin:0 0 14px;color:#fff;font-size:15px}
    .footer-links{display:flex;flex-direction:column;gap:8px;font-size:13px}
    .footer-links a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:40px;padding-top:18px;border-top:1px solid rgba(255,255,255,.14);font-size:12px;color:#839ab3}
    .video-page{padding:58px 0 0}
    .video-page .page-heading{text-align:center;max-width:760px;margin:0 auto 34px}
    .eyebrow{display:inline-block;margin-bottom:10px;color:var(--theme);font-size:13px;font-weight:700;letter-spacing:2px}
    .video-page h1{margin:0;color:var(--deep);font-size:clamp(30px,4vw,48px);line-height:1.2}
    .video-page .intro{margin:16px auto 0;color:var(--muted);font-size:15px}
    .video-filter{display:flex;justify-content:center;flex-wrap:wrap;gap:10px;margin:0 auto 34px}
    .video-filter a{padding:8px 17px;background:#fff;border:1px solid var(--line);border-radius:30px;color:#526982;font-size:13px}
    .video-filter a:hover,.video-filter a.active{background:var(--theme);border-color:var(--theme);color:#fff}
    .video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
    .video-card{overflow:hidden;background:#fff;border:1px solid #e3edf6;border-radius:15px;box-shadow:0 8px 24px rgba(12,55,100,.06);transition:transform .2s,box-shadow .2s}
    .video-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
    .video-cover{position:relative;aspect-ratio:16/9;background:linear-gradient(135deg,#d9ebfb,#8cb8df);overflow:hidden}
    .video-cover img{width:100%;height:100%;object-fit:cover}
    .video-play{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:20px;padding-left:3px}
    .video-duration{position:absolute;right:10px;bottom:10px;padding:3px 7px;border-radius:4px;background:rgba(4,20,42,.78);color:#fff;font-size:11px}
    .video-body{padding:18px}
    .video-meta{display:flex;justify-content:space-between;margin-bottom:7px;color:#7890a8;font-size:12px}
    .video-body h2{margin:0 0 8px;color:var(--deep);font-size:18px;line-height:1.4}
    .video-body p{display:-webkit-box;overflow:hidden;margin:0;color:var(--muted);font-size:13px;line-height:1.7;-webkit-box-orient:vertical;-webkit-line-clamp:3}
    .video-more{display:inline-block;margin-top:14px;color:var(--theme);font-size:13px;font-weight:700}
    .pagination{display:flex;justify-content:center;gap:8px;margin-top:42px}
    .pagination a{min-width:36px;padding:6px 11px;border:1px solid var(--line);border-radius:6px;background:#fff;text-align:center;color:#58708b;font-size:13px}
    .pagination a:hover,.pagination a.active{background:var(--theme);border-color:var(--theme);color:#fff}
    @media(max-width:1050px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-btns{margin-left:auto}
      .video-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media(max-width:700px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{align-items:flex-start;flex-direction:column;padding:8px 0;gap:3px}
      .topbar-info{gap:12px}
      .header-inner{height:68px;gap:10px}
      .logo{min-width:0;font-size:17px}
      .logo img{width:32px;height:32px}
      .member-link{display:none}
      .open-account{padding:8px 11px}
      .video-page{padding-top:38px}
      .video-grid{grid-template-columns:1fr;gap:18px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:28px 18px}
      .footer-bottom{align-items:flex-start;flex-direction:column}
    }
    @media(max-width:450px){
      .footer-grid{grid-template-columns:1fr}
    }