:root{
      --theme:#0B3D91;
      --ink:#111827;
      --muted:#64748b;
      --line:#e5e7eb;
      --paper:#f6f8fb;
      --white:#fff;
      --shadow:0 18px 45px rgba(15,23,42,.08);
      --radius:18px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:var(--paper);font-family:"PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.65}
    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{background:#0b1730;color:#dbeafe;font-size:13px}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-links{display:flex;gap:22px}
    .topbar a{color:#dbeafe;opacity:.9}
    .topbar a:hover{color:#fff}

    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:76px;display:flex;align-items:center;gap:28px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;font-weight:800;font-size:18px;color:#0b1730}
    .logo img{width:36px;height:36px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:center;justify-content:center;gap:4px;padding:0;margin:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:5px;padding:27px 13px;font-size:14px;white-space:nowrap}
    .nav-link:hover,.nav-item:focus-within>.nav-link{color:var(--theme)}
    .has-arrow:after{content:"";width:6px;height:6px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg) translateY(-2px)}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(8px);width:330px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:0 0 16px 16px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s;z-index:30}
    .mega-menu{width:580px}
    .nav-item:hover .dropdown-panel,.nav-item:hover .mega-menu,.nav-item:focus-within .dropdown-panel,.nav-item:focus-within .mega-menu{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
    .dropdown-panel a:not(.mega-footer){display:block;padding:9px 0;border-bottom:1px solid #f1f5f9;font-size:14px}
    .mega-title{margin:0 0 13px;color:var(--theme);font-size:13px;font-weight:800;letter-spacing:.08em}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
    .mega-card{display:block;padding:12px;border:1px solid #edf0f5;border-radius:12px;background:#fafcff}
    .mega-card:hover{border-color:#9bb8e9;background:#f2f7ff}
    .mega-card img{width:30px;height:30px;object-fit:contain;margin-bottom:6px}
    .mega-card strong{display:block;font-size:13px;line-height:1.4}
    .mega-card small{display:block;margin-top:4px;color:var(--muted);font-size:11px;line-height:1.45}
    .mega-footer{display:block;margin-top:16px;padding-top:13px;border-top:1px solid var(--line);color:var(--theme);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:12px;white-space:nowrap}
    .member-btn{font-size:13px;color:var(--theme)}
    .open-account{padding:9px 15px;background:var(--theme);color:#fff;border-radius:8px;font-size:13px}
    .hamburger{display:none;width:42px;height:40px;border:1px solid var(--line);background:#fff;border-radius:8px;cursor:pointer;padding:9px}
    .hamburger span{display:block;height:2px;margin:4px 0;background:#172033;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{position:fixed;inset:0;background:rgba(2,8,23,.54);opacity:0;visibility:hidden;transition:.25s;z-index:50}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:0;width:min(380px,88vw);height:100vh;background:#fff;transform:translateX(100%);transition:.28s;z-index:60;overflow:auto}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:14px;padding:19px 20px;border-bottom:1px solid var(--line);font-weight:700}
    .drawer-head>a{margin-left:auto;color:var(--theme);font-size:14px}
    .drawer-close{border:0;background:none;font-size:28px;line-height:1;cursor:pointer;color:#64748b}
    .drawer-menu{padding:10px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border-bottom:1px solid #eef2f7;text-align:left;background:none;border:0;border-bottom:1px solid #eef2f7;color:var(--ink);cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:18px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:4px 0 8px 15px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:14px}

    .video-page{padding:58px 0 80px}
    .page-heading{text-align:center;max-width:760px;margin:0 auto 34px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;margin-bottom:12px;color:var(--theme);font-size:12px;font-weight:800;letter-spacing:.16em}
    .eyebrow:before{content:"";width:24px;height:2px;background:var(--theme)}
    .page-heading h1{margin:0;font-size:clamp(30px,5vw,52px);letter-spacing:-.04em;line-height:1.15}
    .page-heading p{margin:16px 0 0;color:var(--muted);font-size:16px}
    .video-toolbar{display:flex;justify-content:space-between;align-items:center;gap:18px;margin-bottom:23px;padding:16px 20px;background:#fff;border:1px solid var(--line);border-radius:14px}
    .video-toolbar strong{font-size:15px}
    .video-toolbar span{color:var(--muted);font-size:13px}
    .video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
    .video-card{overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 28px rgba(15,23,42,.04);transition:.25s}
    .video-card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:#b5c9e8}
    .video-cover{position:relative;aspect-ratio:16/9;overflow:hidden;background:#dbeafe}
    .video-cover img{width:100%;height:100%;object-fit:cover;transition:.3s}
    .video-card:hover .video-cover img{transform:scale(1.04)}
    .play-mark{position:absolute;left:18px;bottom:16px;width:40px;height:40px;border-radius:50%;display:grid;place-items:center;background:var(--theme);color:#fff;box-shadow:0 4px 12px rgba(11,61,145,.3)}
    .play-mark:after{content:"";margin-left:3px;border-left:10px solid #fff;border-top:6px solid transparent;border-bottom:6px solid transparent}
    .duration{position:absolute;right:12px;bottom:12px;padding:3px 7px;background:rgba(0,0,0,.7);color:#fff;border-radius:5px;font-size:11px}
    .video-body{padding:18px 19px 20px}
    .video-body h2{margin:0 0 9px;font-size:18px;line-height:1.4}
    .video-body p{display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden;margin:0;color:var(--muted);font-size:13px;min-height:42px}
    .video-meta{display:flex;justify-content:space-between;gap:10px;margin-top:17px;padding-top:13px;border-top:1px solid #eef2f7;color:#8491a5;font-size:12px}
    .pagination{display:flex;justify-content:center;gap:8px;margin-top:38px;flex-wrap:wrap}
    .pagination a{min-width:36px;padding:7px 11px;text-align:center;border:1px solid var(--line);border-radius:7px;background:#fff;color:#526176;font-size:13px}
    .pagination a:hover,.pagination a.active{background:var(--theme);border-color:var(--theme);color:#fff}

    .footer{background:#0b1730;color:#d7e0ef;padding:54px 0 22px}
    .footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:38px}
    .footer-brand strong{display:block;color:#fff;font-size:20px;margin-bottom:14px}
    .footer p{margin:8px 0;color:#9eacc1;font-size:13px}
    .footer h3{margin:0 0 14px;color:#fff;font-size:14px}
    .footer-grid>div:not(.footer-brand) a{display:block;color:#aebbd0;font-size:13px;margin:8px 0}
    .footer-grid 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,.12);color:#8d9bb1;font-size:12px}

    @media(max-width:1050px){
      .main-nav{display:none}
      .hamburger{display:block}
      .logo{min-width:0}
      .header-inner{justify-content:space-between}
      .video-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media(max-width:650px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{align-items:flex-start;flex-direction:column;padding:8px 0;gap:3px}
      .topbar-links{gap:12px;flex-wrap:wrap}
      .header-inner{height:66px;gap:10px}
      .member-btn{display:none}
      .video-page{padding:40px 0 58px}
      .page-heading{margin-bottom:25px}
      .page-heading p{font-size:14px}
      .video-toolbar{align-items:flex-start;flex-direction:column;gap:4px}
      .video-grid{grid-template-columns:1fr;gap:16px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:25px}
      .footer-brand{grid-column:1/-1}
      .footer-bottom{align-items:flex-start;flex-direction:column;gap:8px}
    }