:root{
      --theme:#0B3D91;
      --ink:#17233d;
      --muted:#6d7890;
      --line:#e5eaf2;
      --soft:#f4f7fb;
      --white:#fff;
      --shadow:0 16px 42px rgba(24,48,91,.10);
      --radius:18px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f8faff;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:#102444;color:#dce7fa;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{color:#dce7fa}
    .header{position:relative;z-index:20;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line)}
    .header-inner{height:78px;display:flex;align-items:center;gap:34px}
    .logo{display:flex;align-items:center;gap:11px;min-width:max-content;font-size:19px;font-weight:800;color:var(--theme)}
    .logo img{width:38px;height:38px;object-fit:contain;border-radius:10px}
    .main-nav{margin-left:auto}
    .nav-list{display:flex;align-items:stretch;gap:3px;list-style:none;padding:0;margin:0}
    .nav-item{position:relative}
    .nav-link{height:78px;display:flex;align-items:center;padding:0 14px;font-size:14px;font-weight:600;color:#243451;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"";display:inline-block;width:6px;height:6px;margin:0 0 3px 8px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg)}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% - 1px);left:50%;transform:translate(-50%,8px);opacity:0;visibility:hidden;pointer-events:none;background:#fff;border:1px solid var(--line);border-radius:0 0 16px 16px;box-shadow:var(--shadow);transition:.2s ease}
    .dropdown-panel{width:260px;padding:12px}
    .dropdown-panel a{display:block;padding:9px 12px;border-radius:9px;font-size:13px}
    .dropdown-panel a:hover{background:var(--soft);color:var(--theme)}
    .mega-menu{width:700px;padding:22px}
    .nav-item:hover>.mega-menu,.nav-item:focus-within>.mega-menu,.nav-item:hover>.dropdown-panel,.nav-item:focus-within>.dropdown-panel{transform:translate(-50%,0);opacity:1;visibility:visible;pointer-events:auto}
    .mega-section-title{margin:0 0 13px;color:var(--theme);font-size:13px;font-weight:800}
    .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:12px;background:#fff}
    .mega-card:hover{border-color:#a9bddd;background:#f8fbff}
    .mega-card img{width:42px;height:42px;object-fit:cover;border-radius:8px;background:#edf2fa;flex:none}
    .mega-card span{min-width:0;display:flex;flex-direction:column}
    .mega-card strong{font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .mega-card small{font-size:11px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .mega-links{display:flex;flex-wrap:wrap;gap:8px;margin-top:15px}
    .mega-links a{padding:7px 11px;background:#f1f5fb;color:var(--theme);border-radius:8px;font-size:12px}
    .header-btns{display:flex;align-items:center;gap:14px}
    .member-btn{padding:9px 15px;border-radius:9px;background:var(--theme);color:#fff;font-size:13px;font-weight:700;white-space:nowrap}
    .hamburger{display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:10px;background:#fff;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;z-index:40;background:rgba(9,24,48,.45);opacity:0;visibility:hidden;transition:.25s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;z-index:50;top:0;right:0;width:min(390px,88vw);height:100vh;background:#fff;transform:translateX(100%);transition:.28s;overflow:auto;box-shadow:-15px 0 40px rgba(12,30,62,.18)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:14px;padding:20px;border-bottom:1px solid var(--line);color:var(--theme);font-weight:800}
    .drawer-head>a{margin-left:auto;padding:6px 11px;background:var(--theme);color:#fff;border-radius:7px;font-size:13px}
    .drawer-close{border:0;background:transparent;color:#54627b;font-size:28px;line-height:1;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 var(--line);background:none;text-align:left;color:var(--ink);font-size:15px;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:20px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:5px 0 8px 14px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:13px}
    .footer{margin-top:70px;background:#101f3a;color:#c9d5e8}
    .footer .container{padding-top:45px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:42px;padding-bottom:38px}
    .footer-brand strong{display:block;color:#fff;font-size:20px;margin-bottom:12px}
    .footer p{margin:0;color:#9eacc2;font-size:13px}
    .footer h3{margin:0 0 15px;color:#fff;font-size:14px}
    .footer-grid>div:not(.footer-brand) a{display:block;margin:7px 0;color:#bdcbe0;font-size:13px}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;padding:18px 0;border-top:1px solid rgba(255,255,255,.12);font-size:12px;color:#8f9db4}
    .video-page{padding:54px 0 20px}
    .video-page .page-heading{text-align:center;max-width:760px;margin:0 auto 34px}
    .video-page .eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--theme);font-size:13px;font-weight:800;letter-spacing:.12em}
    .video-page .eyebrow:before{content:"";width:22px;height:2px;background:var(--theme)}
    .video-page h1{margin:9px 0 10px;font-size:clamp(30px,4vw,48px);line-height:1.2;letter-spacing:-.04em}
    .video-page .page-heading p{margin:0;color:var(--muted);font-size:15px}
    .video-filter{display:flex;justify-content:center;flex-wrap:wrap;gap:10px;margin-bottom:28px}
    .video-filter a{padding:8px 16px;background:#fff;border:1px solid var(--line);border-radius:99px;color:#52617b;font-size:13px}
    .video-filter a:hover,.video-filter a.active{background:var(--theme);border-color:var(--theme);color:#fff}
    .video-list{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
    .video-card{display:flex;flex-direction:column;min-width:0;overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 24px rgba(22,49,91,.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:#dce5f2;overflow:hidden}
    .video-cover img{width:100%;height:100%;object-fit:cover;transition:transform .35s}
    .video-card:hover .video-cover img{transform:scale(1.05)}
    .video-cover:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 48%,rgba(10,24,53,.52))}
    .play-mark{position:absolute;z-index:1;left:18px;bottom:16px;width:42px;height:42px;display:grid;place-items:center;border-radius:50%;background:#fff;color:var(--theme);box-shadow:0 5px 18px rgba(0,0,0,.2)}
    .play-mark:after{content:"";margin-left:3px;border-left:11px solid currentColor;border-top:7px solid transparent;border-bottom:7px solid transparent}
    .duration{position:absolute;z-index:1;right:13px;bottom:13px;padding:3px 8px;background:rgba(12,27,55,.78);color:#fff;border-radius:5px;font-size:11px}
    .video-body{padding:18px 19px 20px}
    .video-category{display:inline-block;margin-bottom:8px;color:var(--theme);font-size:11px;font-weight:800}
    .video-body h2{margin:0 0 8px;font-size:18px;line-height:1.4}
    .video-body p{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;margin:0 0 15px;color:var(--muted);font-size:13px;min-height:4.2em}
    .video-meta{display:flex;justify-content:space-between;gap:10px;padding-top:12px;border-top:1px solid var(--line);color:#8894a8;font-size:12px}
    .pagination{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin:38px 0 8px}
    .pagination a{min-width:36px;padding:7px 12px;text-align:center;border:1px solid var(--line);border-radius:8px;background:#fff;color:#53617a;font-size:13px}
    .pagination a:hover,.pagination a.current,.pagination a.active{background:var(--theme);border-color:var(--theme);color:#fff}
    @media(max-width:1020px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-inner{justify-content:space-between}
      .header-btns{margin-left:auto}
      .video-list{grid-template-columns:repeat(2,1fr)}
    }
    @media(max-width:680px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{align-items:flex-start;flex-direction:column;gap:2px;padding:8px 0}
      .topbar-links{gap:12px;flex-wrap:wrap}
      .header-inner{height:68px}
      .logo{font-size:16px}
      .logo img{width:32px;height:32px}
      .member-btn{display:none}
      .mega-menu{display:none}
      .video-page{padding-top:36px}
      .video-page h1{font-size:31px}
      .video-list{grid-template-columns:1fr;gap:16px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:28px 18px}
      .footer-brand{grid-column:1/-1}
      .footer-bottom{display:block}
      .footer-bottom span{display:block;margin:5px 0}
    }