:root{
      --theme:#0B3D91;
      --ink:#14213d;
      --muted:#667085;
      --line:#e6eaf0;
      --soft:#f5f7fb;
      --white:#fff;
      --shadow:0 14px 40px rgba(20,33,61,.09);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#fff;font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.7}
    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:#101d36;color:#dce5f4;font-size:13px}
    .topbar .container{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-links{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:76px;display:flex;align-items:center;gap:30px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;color:var(--theme);font-weight:800;font-size:19px}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:center;justify-content:center;gap:4px;list-style:none;padding:0;margin:0}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:6px;padding:26px 14px;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) translateY(-2px)}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% + 1px);left:50%;transform:translateX(-50%) translateY(8px);width:320px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:0 0 12px 12px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s;z-index:30}
    .mega-menu{width:610px}
    .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:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .drop-title,.mega-title{margin:0 0 13px;font-weight:800;color:var(--theme);font-size:15px}
    .drop-list,.mega-links{display:grid;gap:9px}
    .drop-list a,.mega-links a{font-size:14px;color:#49566d}
    .drop-list a:hover,.mega-links a:hover{color:var(--theme)}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
    .mega-card{display:flex;gap:10px;padding:10px;border:1px solid var(--line);border-radius:9px}
    .mega-card:hover{border-color:#a9bde5;background:#f8faff}
    .mega-card img{width:34px;height:34px;object-fit:contain;border-radius:6px}
    .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)}
    .mega-columns{display:grid;grid-template-columns:1fr 1fr;gap:30px}
    .mega-footer{display:block;margin-top:18px;padding-top:13px;border-top:1px solid var(--line);font-size:13px;color:var(--theme);font-weight:700}
    .header-btns{display:flex;align-items:center;gap:12px;white-space:nowrap}
    .member-btn{padding:8px 14px;border-radius:6px;background:var(--theme);color:#fff;font-size:13px}
    .account-link{font-size:14px;color:var(--theme);font-weight:700}
    .hamburger{display:none;width:40px;height:40px;border:1px solid var(--line);background:#fff;border-radius:7px;cursor:pointer;padding:9px}
    .hamburger span{display:block;height:2px;background:var(--theme);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{position:fixed;inset:0;background:rgba(9,20,40,.48);opacity:0;visibility:hidden;transition:.25s;z-index:80}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;right:0;top:0;bottom:0;width:min(390px,88vw);background:#fff;z-index:90;transform:translateX(100%);transition:.28s;overflow:auto}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:16px;padding:20px;border-bottom:1px solid var(--line);color:var(--theme)}
    .drawer-head strong{flex:1}
    .drawer-head a{font-size:14px}
    .drawer-close{border:0;background:none;font-size:28px;line-height:1;color:#718096;cursor:pointer}
    .drawer-menu{padding:12px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid var(--line);background:none;text-align:left;color:var(--ink);font-weight:700;cursor:pointer}
    .drawer-group{border-bottom:1px solid var(--line)}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:20px;font-weight:400}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:4px 0 10px 14px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:7px 0;color:var(--muted);font-size:14px}
    .footer{margin-top:80px;background:#111d33;color:#c3ccda}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.1fr;gap:42px;padding:55px 0 42px}
    .footer-brand strong{display:block;color:#fff;font-size:20px;margin-bottom:12px}
    .footer p{margin:6px 0;font-size:13px;color:#aeb9c9}
    .footer h3{margin:0 0 14px;color:#fff;font-size:15px}
    .footer-grid>div:not(.footer-brand) a{display:block;margin:7px 0;font-size:13px;color:#c3ccda}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid rgba(255,255,255,.12);padding:18px 0 22px;font-size:12px;color:#96a4b9}
    .video-page{background:linear-gradient(180deg,#f7f9fc 0,#fff 460px);padding:58px 0 0;min-height:620px}
    .video-page .page-heading{text-align:center;max-width:720px;margin:0 auto 36px}
    .video-page .eyebrow{display:inline-block;color:var(--theme);font-size:13px;font-weight:800;letter-spacing:2px;margin-bottom:7px}
    .video-page h1{margin:0 0 12px;font-size:clamp(30px,4vw,46px);line-height:1.25;color:#12284d}
    .video-page .intro{margin:0;color:var(--muted);font-size:15px}
    .video-filter{display:flex;justify-content:center;flex-wrap:wrap;gap:9px;margin:0 auto 30px}
    .video-filter a{padding:7px 17px;background:#fff;border:1px solid var(--line);border-radius:999px;color:#59667b;font-size:13px}
    .video-filter a:hover,.video-filter a.active{border-color:var(--theme);background:var(--theme);color:#fff}
    .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:14px;box-shadow:0 8px 24px rgba(24,47,86,.05);transition:.2s}
    .video-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
    .video-cover{position:relative;aspect-ratio:16/9;background:#dfe6f1;overflow:hidden}
    .video-cover img{width:100%;height:100%;object-fit:cover}
    .video-play{position:absolute;left:18px;bottom:15px;width:40px;height:40px;border-radius:50%;display:grid;place-items:center;background:rgba(11,61,145,.92);color:#fff;font-size:16px}
    .video-duration{position:absolute;right:12px;bottom:12px;padding:2px 7px;border-radius:4px;background:rgba(0,0,0,.72);color:#fff;font-size:12px}
    .video-body{padding:17px 18px 19px}
    .video-body h2{font-size:17px;line-height:1.45;margin:0 0 8px;color:#1b3155}
    .video-body h2 a:hover{color:var(--theme)}
    .video-body p{height:48px;overflow:hidden;margin:0 0 13px;color:var(--muted);font-size:13px;line-height:1.8}
    .video-meta{display:flex;justify-content:space-between;gap:12px;padding-top:11px;border-top:1px solid var(--line);font-size:12px;color:#8994a5}
    .pagination{display:flex;justify-content:center;gap:8px;margin:40px 0 4px;flex-wrap:wrap}
    .pagination a{min-width:34px;padding:5px 10px;text-align:center;border:1px solid var(--line);border-radius:5px;color:#59667b;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){
      .nav-link{padding-left:8px;padding-right:8px}
      .logo{min-width:160px}
    }
    @media(max-width:820px){
      .topbar .container{padding:8px 0;align-items:flex-start;flex-direction:column;gap:2px}
      .topbar-links{gap:14px}
      .header-inner{height:68px}
      .main-nav{display:none}
      .header-btns{margin-left:auto}
      .hamburger{display:block}
      .account-link{display:none}
      .footer-grid{grid-template-columns:repeat(2,1fr);gap:28px}
      .video-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media(max-width:560px){
      .container{width:min(100% - 28px,1180px)}
      .topbar{font-size:12px}
      .topbar-links{flex-direction:column;gap:0}
      .logo{min-width:0;font-size:16px}
      .logo img{width:32px;height:32px}
      .member-btn{padding:7px 10px;font-size:12px}
      .video-page{padding-top:40px}
      .video-page h1{font-size:31px}
      .video-grid{grid-template-columns:1fr;gap:17px}
      .footer-grid{grid-template-columns:1fr;padding-top:38px}
      .footer-bottom{display:block}
      .footer-bottom span{display:block;margin-top:5px}
    }