:root{
      --theme:#0B3D91;
      --deep:#071a4d;
      --ink:#102452;
      --muted:#667694;
      --line:#dbe5f3;
      --bg:#f4f8fd;
      --white:#fff;
      --shadow:0 18px 50px rgba(7,30,78,.10);
      --radius:18px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:var(--bg);font-family:"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{height:38px;background:var(--deep);color:#dce8ff;font-size:13px}
    .topbar-inner{height:38px;display:flex;align-items:center;justify-content:space-between}
    .topbar-right{display:flex;gap:22px}
    .topbar a:hover{color:#fff}
    .header{height:76px;background:#fff;border-bottom:1px solid #e7eef8;position:relative;z-index:20}
    .header-inner{height:76px;display:flex;align-items:center;gap:38px}
    .logo{display:flex;align-items:center;gap:10px;white-space:nowrap;font-size:19px;font-weight:800;color:var(--deep)}
    .logo img{width:34px;height:34px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:stretch;justify-content:center;gap:4px;list-style:none;margin:0;padding:0;height:76px}
    .nav-item{position:relative;display:flex;align-items:center}
    .nav-link{padding:27px 14px;height:76px;font-size:14px;font-weight:600;white-space:nowrap}
    .nav-link:hover,.nav-item:focus-within>.nav-link{color:var(--theme)}
    .has-arrow:after{content:"⌄";font-size:12px;margin-left:6px;color:#8ba0bd}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(8px);opacity:0;visibility:hidden;pointer-events:none;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);transition:.22s ease;z-index:30}
    .dropdown-panel{width:260px;padding:12px;border-radius:0 0 14px 14px}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .dropdown-panel a{display:block;padding:10px 12px;border-radius:9px;font-size:13px}
    .dropdown-panel a:hover{background:#edf4ff;color:var(--theme)}
    .mega-menu{width:760px;padding:20px;border-radius:0 0 18px 18px}
    .nav-item:hover>.mega-menu,.nav-item:focus-within>.mega-menu,
    .nav-item:hover>.dropdown-panel,.nav-item:focus-within>.dropdown-panel{opacity:1;visibility:visible;pointer-events:auto;transform:translateX(-50%) translateY(0)}
    .mega-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px;color:var(--deep)}
    .mega-heading a,.mega-footer{color:var(--theme);font-size:13px}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
    .mega-card{display:flex;gap:11px;padding:11px;border:1px solid #e6edf7;border-radius:12px;min-width:0}
    .mega-card:hover{border-color:#9bb9e8;background:#f7faff}
    .mega-card img{width:48px;height:42px;border-radius:8px;object-fit:cover;background:#eef4fc;flex:none}
    .mega-card span{min-width:0}
    .mega-card b,.mega-card small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .mega-card b{font-size:13px}.mega-card small{font-size:11px;color:var(--muted)}
    .mega-footer{display:block;margin-top:15px;padding-top:14px;border-top:1px solid var(--line)}
    .header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}
    .member-link{font-size:13px;color:var(--theme);font-weight:700}
    .open-account{background:var(--theme);color:#fff;border-radius:9px;padding:8px 15px;font-size:13px;font-weight:700}
    .hamburger{display:none;border:0;background:none;padding:8px;cursor:pointer}
    .hamburger span{display:block;width:23px;height:2px;background:var(--deep);margin:5px 0;transition:.2s}
    .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{display:none;position:fixed;inset:0;background:rgba(3,16,46,.48);z-index:40}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;top:0;right:0;bottom:0;width:min(370px,88vw);background:#fff;z-index:50;transform:translateX(100%);transition:.28s ease;overflow:auto}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{height:68px;padding:0 20px;display:flex;align-items:center;gap:16px;border-bottom:1px solid var(--line);font-weight:700;color:var(--deep)}
    .drawer-head a{margin-left:auto;color:var(--theme);font-size:14px}
    .drawer-close{border:0;background:none;font-size:28px;line-height:1;color:#71809b;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 #edf1f7;background:none;text-align:left;color:var(--ink);font-weight:650;cursor:pointer}
    .drawer-toggle:after{content:"＋";float:right;color:#93a4bf}
    .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:13px}
    .footer{background:var(--deep);color:#c4d1e9;padding:54px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px}
    .footer-brand{font-size:20px;color:#fff;font-weight:800;margin-bottom:12px}
    .footer p{margin:7px 0;font-size:13px}
    .footer h3{font-size:14px;color:#fff;margin:0 0 13px}
    .footer-grid>div:not(:first-child) a{display:block;font-size:13px;margin:7px 0;color:#c4d1e9}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{margin-top:38px;padding-top:18px;border-top:1px solid rgba(255,255,255,.14);font-size:12px;color:#92a6c7}
    .video-page{padding:58px 0 82px}
    .video-heading{text-align:center;max-width:760px;margin:0 auto 34px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--theme);font-size:13px;font-weight:800;letter-spacing:1px}
    .eyebrow:before{content:"";width:24px;height:2px;background:#4c9ce8}
    .video-heading h1{font-size:clamp(32px,5vw,54px);line-height:1.15;color:var(--deep);margin:14px 0 12px}
    .video-heading p{margin:0;color:var(--muted);font-size:16px}
    .category-bar{background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px 16px;display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:28px;box-shadow:0 8px 25px rgba(18,52,105,.05)}
    .category-label{font-size:13px;font-weight:800;color:var(--deep);margin-right:6px}
    .category-bar a{padding:7px 14px;border-radius:999px;font-size:13px;color:var(--muted)}
    .category-bar a:hover,.category-bar a.current{background:var(--theme);color:#fff}
    .video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
    .video-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:0 10px 30px rgba(18,52,105,.06);transition:.22s ease}
    .video-card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:#a9c5eb}
    .video-cover{height:190px;position:relative;background:linear-gradient(135deg,#0b3d91,#58b9ea);overflow:hidden}
    .video-cover img{width:100%;height:100%;object-fit:cover}
    .video-cover:after{content:"▶";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:48px;height:48px;border-radius:50%;background:rgba(255,255,255,.9);color:var(--theme);display:grid;place-items:center;padding-left:3px;font-size:18px;box-shadow:0 7px 20px rgba(0,0,0,.18)}
    .video-duration{position:absolute;right:12px;bottom:10px;background:rgba(3,18,57,.78);color:#fff;border-radius:5px;padding:2px 7px;font-size:11px;z-index:1}
    .video-body{padding:18px 18px 19px}
    .video-meta{display:flex;justify-content:space-between;gap:10px;color:#7690b3;font-size:12px;margin-bottom:8px}
    .video-card h2{font-size:18px;line-height:1.4;color:var(--deep);margin:0 0 8px}
    .video-card p{font-size:13px;color:var(--muted);margin:0;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
    .video-link{display:inline-block;margin-top:14px;color:var(--theme);font-size:13px;font-weight:800}
    .pagination{display:flex;justify-content:center;align-items:center;gap:8px;margin-top:42px;flex-wrap:wrap}
    .pagination a{min-width:36px;height:36px;padding:6px 11px;border:1px solid var(--line);background:#fff;border-radius:8px;text-align:center;color:var(--muted);font-size:13px}
    .pagination a:hover,.pagination a.current,.pagination a.active{background:var(--theme);color:#fff;border-color:var(--theme)}
    @media(max-width:1050px){
      .header-inner{gap:15px}.nav-link{padding-left:8px;padding-right:8px}.mega-menu{width:680px}
    }
    @media(max-width:800px){
      .topbar{height:auto;padding:8px 0}.topbar-inner{height:auto;display:block}.topbar-right{gap:14px;margin-top:3px}
      .header,.header-inner{height:66px}.main-nav{display:none}.header-btns{margin-left:auto}.member-link{display:none}.hamburger{display:block}
      .mega-menu,.dropdown-panel{display:none}
      .video-page{padding:42px 0 62px}.video-grid{grid-template-columns:repeat(2,1fr)}
      .footer-grid{grid-template-columns:repeat(2,1fr);gap:28px}
    }
    @media(max-width:540px){
      .container{width:min(100% - 28px,1180px)}.topbar-inner{font-size:11px}.topbar-right{font-size:11px}
      .video-heading h1{font-size:36px}.video-heading p{font-size:14px}.category-bar{padding:10px}
      .video-grid{grid-template-columns:1fr;gap:17px}.video-cover{height:205px}
      .footer-grid{grid-template-columns:1fr;gap:24px}.footer{padding-top:38px}
    }