:root{--theme:#0B3D91;--ink:#132238;--muted:#68768a;--line:#e4eaf2;--soft:#f5f8fc;--white:#fff;--shadow:0 18px 45px rgba(20,49,91,.1)}
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f7f9fc;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Arial,sans-serif;line-height:1.65}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block}
    .container{width:min(1180px,calc(100% - 36px));margin:0 auto}
    .topbar{background:#092e6d;color:#dce9ff;font-size:13px}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:18px}
    .topbar a{margin-left:18px;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:inline-flex;align-items:center;gap:10px;min-width:190px;font-weight:800;font-size:19px;color:var(--theme)}
    .logo img{width:36px;height:36px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;justify-content:center;align-items:stretch;gap:4px;padding:0;margin:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:5px;height:76px;padding:0 14px;font-size:15px;color:#33445b;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) translateY(-2px)}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% - 1px);left:50%;transform:translateX(-50%) translateY(8px);width:270px;padding:15px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s ease}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .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;transform:translateX(-50%) translateY(0)}
    .dropdown-panel a{display:block;padding:9px 10px;border-bottom:1px solid #eef2f7;color:#4b5c72;font-size:14px}
    .dropdown-panel a:last-child{border-bottom:0;color:var(--theme);font-weight:700}
    .mega-menu{width:680px;padding:20px}
    .mega-title{margin:0 0 11px;color:var(--theme);font-size:14px;font-weight:800}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:17px}
    .mega-card{display:block;padding:11px;border:1px solid #e8edf5;border-radius:10px;background:#fbfcfe;transition:.2s}
    .mega-card:hover{border-color:#a8bfeb;background:#f0f5ff;transform:translateY(-2px)}
    .mega-card img{width:32px;height:32px;object-fit:contain;border-radius:7px;margin-bottom:6px}
    .mega-card strong,.mega-card small{display:block;overflow:hidden;text-overflow:ellipsis}
    .mega-card strong{font-size:13px;white-space:nowrap}
    .mega-card small{margin-top:3px;color:var(--muted);font-size:11px;line-height:1.45}
    .mega-footer{display:block;padding-top:12px;border-top:1px solid var(--line);color:var(--theme);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:9px;white-space:nowrap}
    .member-btn,.open-btn{padding:9px 13px;border-radius:7px;font-size:13px}
    .member-btn{color:var(--theme);border:1px solid #cbdaf3}
    .open-btn{color:#fff;background:var(--theme)}
    .hamburger{display:none;width:42px;height:40px;border:1px solid var(--line);border-radius:7px;background:#fff;cursor:pointer;padding:9px}
    .hamburger span{display:block;height:2px;background:var(--theme);margin:4px 0;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(4,19,43,.48);opacity:0;visibility:hidden;z-index:50;transition:.2s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:0;bottom:0;width:min(370px,88vw);background:#fff;z-index:51;transform:translateX(100%);transition:.25s ease;overflow:auto;box-shadow:-12px 0 35px rgba(0,0,0,.16)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{height:70px;display:flex;align-items:center;gap:12px;padding:0 20px;background:#f3f7ff;color:var(--theme);font-weight:800}
    .drawer-head>a{margin-left:auto;color:#fff;background:var(--theme);padding:6px 12px;border-radius:5px;font-size:13px}
    .drawer-close{font-size:28px;border:0;background:none;color:#5f6e83;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 #edf1f6;background:none;text-align:left;font-size:15px;color:var(--ink);cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:20px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{max-height:0;overflow:hidden;transition:.2s;background:#f7f9fc}
    .drawer-submenu.open{max-height:700px;padding:6px 12px}
    .drawer-submenu a{display:block;padding:8px 0;color:#596a80;font-size:14px}
    .footer{margin-top:65px;background:#0d1c32;color:#bdc9da;padding:48px 0 0}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:38px}
    .footer h3{margin:0 0 15px;color:#fff;font-size:15px}
    .footer-brand strong{display:block;color:#fff;font-size:20px;margin-bottom:12px}
    .footer p{margin:7px 0;font-size:13px}
    .footer-grid>div:not(.footer-brand) a{display:block;margin:8px 0;color:#bdc9da;font-size:13px}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{margin-top:35px;padding:18px 0;border-top:1px solid rgba(255,255,255,.12);font-size:12px;color:#8fa0b7}
    .video-page{padding:52px 0 0}
    .video-page .page-heading{text-align:center;max-width:740px;margin:0 auto 35px}
    .video-page .eyebrow{display:inline-block;color:var(--theme);background:#eaf1ff;border-radius:30px;padding:5px 13px;font-size:13px;font-weight:700}
    .video-page h1{margin:13px 0 8px;font-size:clamp(30px,4vw,48px);letter-spacing:-1px;color:#102b54}
    .video-page .intro{margin:0;color:var(--muted);font-size:16px}
    .video-page .category-bar{display:flex;flex-wrap:wrap;justify-content:center;gap:9px;margin:28px auto 38px}
    .video-page .category-bar a{padding:8px 16px;border:1px solid #d8e3f2;border-radius:30px;background:#fff;color:#53657b;font-size:14px}
    .video-page .category-bar a:hover,.video-page .category-bar a.active{background:var(--theme);border-color:var(--theme);color:#fff}
    .video-page .video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
    .video-page .video-card{overflow:hidden;border:1px solid var(--line);border-radius:15px;background:#fff;box-shadow:0 8px 22px rgba(38,69,112,.06);transition:.2s}
    .video-page .video-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
    .video-page .video-cover{position:relative;aspect-ratio:16/9;overflow:hidden;background:#dbe7f8}
    .video-page .video-cover img{width:100%;height:100%;object-fit:cover;transition:.35s}
    .video-page .video-card:hover .video-cover img{transform:scale(1.04)}
    .video-page .play-mark{position:absolute;left:16px;bottom:14px;width:38px;height:38px;display:grid;place-items:center;border-radius:50%;background:rgba(11,61,145,.92);color:#fff;font-size:16px}
    .video-page .duration{position:absolute;right:12px;bottom:12px;padding:3px 7px;border-radius:4px;background:rgba(8,20,39,.78);color:#fff;font-size:12px}
    .video-page .video-body{padding:17px 18px 19px}
    .video-page .video-body h2{margin:0 0 8px;font-size:18px;line-height:1.4;color:#172e50}
    .video-page .video-body p{display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;overflow:hidden;min-height:72px;margin:0;color:#6b788b;font-size:14px}
    .video-page .video-meta{display:flex;justify-content:space-between;gap:10px;margin-top:15px;padding-top:12px;border-top:1px solid #edf1f6;color:#8b97a7;font-size:12px}
    .video-page .video-meta a{color:var(--theme);font-weight:700}
    .video-page .pagination{display:flex;justify-content:center;gap:8px;margin-top:40px}
    .video-page .pagination a{min-width:36px;padding:7px 12px;text-align:center;border:1px solid #dbe4f0;border-radius:6px;background:#fff;color:#52657b;font-size:13px}
    .video-page .pagination a.active,.video-page .pagination a:hover{background:var(--theme);border-color:var(--theme);color:#fff}
    @media(max-width:1050px){
      .logo{min-width:155px}.nav-link{padding:0 8px;font-size:14px}.mega-menu{width:610px}
    }
    @media(max-width:820px){
      .topbar .container{padding:7px 0;align-items:flex-start;flex-direction:column;gap:1px}.topbar a{margin-left:12px}
      .header-inner{height:65px}.main-nav{display:none}.header-btns{margin-left:auto}.member-btn,.open-btn{display:none}.hamburger{display:block}
      .logo{min-width:0}.mega-menu{display:none}.footer-grid{grid-template-columns:repeat(2,1fr);gap:25px}
      .video-page{padding-top:38px}.video-page .video-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media(max-width:560px){
      .container{width:min(100% - 26px,1180px)}.logo span{max-width:145px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
      .footer-grid{grid-template-columns:1fr}.footer{padding-top:36px}.video-page .video-grid{grid-template-columns:1fr}.video-page .page-heading{margin-bottom:25px}
      .video-page .category-bar{justify-content:flex-start;margin-bottom:28px}.video-page h1{font-size:32px}
    }