:root{
      --theme:#0B3D91;
      --ink:#14213d;
      --muted:#6c7890;
      --line:#e5eaf2;
      --soft:#f5f7fb;
      --white:#fff;
      --shadow:0 16px 45px rgba(24,47,87,.10);
      --radius:16px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f7f9fc;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:#101d37;color:#dce5f4;font-size:13px}
    .topbar .container{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:18px}
    .topbar a{color:#dce5f4;margin-left:20px;transition:.2s}
    .topbar a:hover{color:#fff}

    .header{position:relative;z-index:30;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{min-height:78px;display:flex;align-items:center;gap:28px}
    .logo{display:flex;align-items:center;gap:10px;min-width:180px;font-size:19px;font-weight:800;color:#152441;white-space:nowrap}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{margin-left:auto}
    .nav-list{display:flex;align-items:center;gap:4px;list-style:none;margin:0;padding:0}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:5px;padding:27px 13px;color:#34435f;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:310px;padding:21px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s;pointer-events:none}
    .mega-menu{width:650px}
    .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);pointer-events:auto}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;height:12px;top:-12px}
    .drop-title,.mega-title{font-size:15px;font-weight:800;margin-bottom:13px;color:#172746}
    .drop-list{display:grid;gap:7px}
    .drop-list a{display:block;font-size:13px;color:#53627d;padding:6px 0;border-bottom:1px solid #f0f2f6}
    .drop-list a:hover,.mega-card:hover{color:var(--theme)}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
    .mega-card{display:flex;flex-direction:column;gap:3px;min-height:85px;padding:12px;background:#f7f9fc;border:1px solid #edf0f5;border-radius:10px;font-size:13px;transition:.2s}
    .mega-card img{width:28px;height:28px;object-fit:contain;margin-bottom:3px}
    .mega-card strong{font-size:13px;color:#263753}
    .mega-card small{font-size:11px;line-height:1.5;color:#78859a}
    .mega-footer{display:block;margin-top:16px;padding-top:12px;border-top:1px solid var(--line);font-size:13px;color:var(--theme);font-weight:700}
    .header-btns{display:flex;align-items:center;gap:9px}
    .member-btn,.open-btn{font-size:13px;padding:8px 13px;border-radius:8px;white-space:nowrap}
    .member-btn{color:var(--theme);border:1px solid #cad7ee}
    .open-btn{background:var(--theme);color:#fff}
    .member-btn:hover{background:#f0f5ff}
    .open-btn:hover{background:#092f72}
    .hamburger{display:none;width:42px;height:40px;border:1px solid var(--line);background:#fff;border-radius:8px;padding:8px;cursor:pointer}
    .hamburger span{display:block;height:2px;margin:5px 0;background:#213554;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(8,20,42,.45);z-index:80;opacity:0;visibility:hidden;transition:.25s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:0;width:min(390px,88vw);height:100vh;background:#fff;z-index:90;transform:translateX(100%);transition:.28s;overflow:auto;box-shadow:-12px 0 35px rgba(0,0,0,.18)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{height:72px;padding:0 20px;display:flex;align-items:center;gap:12px;border-bottom:1px solid var(--line);font-weight:800}
    .drawer-head>a{margin-left:auto;color:var(--theme);font-size:14px}
    .drawer-close{width:34px;height:34px;border:0;background:#f1f4f8;border-radius:50%;font-size:24px;line-height:1;color:#42516b;cursor:pointer}
    .drawer-menu{padding:12px 20px 35px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid #edf0f4;background:transparent;text-align:left;color:#263753;font-size:15px;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;font-size:20px;color:#8793a7}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:6px 0 8px 15px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:#687790;font-size:13px}

    .video-page{padding:62px 0 84px}
    .page-heading{text-align:center;max-width:760px;margin:0 auto 38px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--theme);font-size:13px;font-weight:800;letter-spacing:.08em}
    .eyebrow:before{content:"";display:inline-block;width:22px;height:2px;background:var(--theme)}
    .page-heading h1{margin:12px 0 11px;color:#142544;font-size:clamp(30px,4vw,48px);line-height:1.22;letter-spacing:-.03em}
    .page-heading p{margin:0;color:var(--muted);font-size:15px}
    .video-toolbar{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:24px;padding:17px 20px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 8px 24px rgba(31,56,96,.05)}
    .video-toolbar strong{font-size:17px;color:#203452}
    .video-toolbar span{color:var(--muted);font-size:13px}
    .video-filter{display:flex;gap:8px;flex-wrap:wrap}
    .video-filter a{padding:6px 12px;border:1px solid #dce4f1;border-radius:99px;font-size:12px;color:#51627f}
    .video-filter a:hover{border-color:var(--theme);color:var(--theme)}
    .video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
    .video-card{min-width:0;overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 10px 30px rgba(26,52,93,.06);transition:transform .22s,box-shadow .22s}
    .video-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
    .video-cover{position:relative;aspect-ratio:16/9;background:linear-gradient(135deg,#10264a,#0b3d91);overflow:hidden}
    .video-cover img{width:100%;height:100%;object-fit:cover}
    .video-cover:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 46%,rgba(5,15,35,.45))}
    .play-mark{position:absolute;z-index:1;left:18px;bottom:16px;width:42px;height:42px;display:grid;place-items:center;border:1px solid rgba(255,255,255,.7);border-radius:50%;background:rgba(11,61,145,.86);color:#fff;font-size:18px;padding-left:3px}
    .duration{position:absolute;z-index:2;right:12px;bottom:12px;padding:3px 8px;background:rgba(7,18,38,.78);border-radius:5px;color:#fff;font-size:11px}
    .video-body{padding:19px 20px 20px}
    .video-meta{display:flex;justify-content:space-between;gap:10px;margin-bottom:8px;color:var(--theme);font-size:12px}
    .video-card h2{margin:0 0 8px;font-size:18px;line-height:1.45;color:#1b2d4b}
    .video-card p{display:-webkit-box;overflow:hidden;margin:0;color:#718098;font-size:13px;line-height:1.75;-webkit-line-clamp:3;-webkit-box-orient:vertical}
    .video-link{display:inline-flex;margin-top:15px;color:var(--theme);font-size:13px;font-weight:700}
    .video-link:after{content:"→";margin-left:7px}
    .pagination{display:flex;justify-content:center;gap:8px;margin-top:42px;flex-wrap:wrap}
    .pagination a{min-width:36px;height:36px;display:grid;place-items:center;padding:0 10px;background:#fff;border:1px solid var(--line);border-radius:8px;color:#61708a;font-size:13px}
    .pagination a:hover,.pagination a.active{background:var(--theme);border-color:var(--theme);color:#fff}

    .footer{background:#101d37;color:#aebbd0;padding:54px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.1fr;gap:36px}
    .footer-brand strong{display:block;margin-bottom:12px;color:#fff;font-size:20px}
    .footer p{margin:6px 0;font-size:13px;line-height:1.8}
    .footer h3{margin:0 0 15px;color:#fff;font-size:15px}
    .footer-grid>div:not(.footer-brand) a,.footer-grid>div:not(.footer-brand) span{display:block;margin:7px 0;color:#aebbd0;font-size:13px}
    .footer a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:38px;padding-top:19px;border-top:1px solid rgba(255,255,255,.12);font-size:12px;color:#8392aa}

    @media (max-width:980px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-inner{justify-content:space-between}
      .header-btns{margin-left:auto}
      .video-grid{grid-template-columns:repeat(2,1fr)}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media (max-width:640px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{min-height:48px;align-items:flex-start;flex-direction:column;justify-content:center;gap:0}
      .topbar a{margin-left:12px}
      .topbar a:first-child{margin-left:0}
      .header-inner{min-height:68px;gap:10px}
      .logo{min-width:0;font-size:16px}
      .logo img{width:32px;height:32px}
      .member-btn,.open-btn{display:none}
      .video-page{padding:42px 0 60px}
      .page-heading{margin-bottom:27px}
      .page-heading h1{font-size:32px}
      .video-toolbar{align-items:flex-start;flex-direction:column;padding:15px}
      .video-grid{grid-template-columns:1fr;gap:18px}
      .video-card h2{font-size:17px}
      .footer{padding-top:40px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:26px 20px}
      .footer-brand{grid-column:1/-1}
      .footer-bottom{align-items:flex-start;flex-direction:column;gap:8px}
    }
    @media (max-width:420px){
      .footer-grid{grid-template-columns:1fr}
      .footer-brand{grid-column:auto}
    }