:root{
      --theme:#0B3D91;
      --ink:#14213d;
      --muted:#667085;
      --line:#e5eaf2;
      --soft:#f5f8fc;
      --white:#fff;
      --shadow:0 16px 44px rgba(22,44,78,.10);
      --radius:16px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#fff;font-family:"PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.65}
    body.drawer-locked{overflow:hidden}
    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:#101a2d;color:#dbe5f5;font-size:13px}
    .topbar-inner{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-contact{display:flex;gap:20px}
    .topbar a{color:#dbe5f5}

    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:78px;display:flex;align-items:center;gap:30px}
    .logo{display:flex;align-items:center;gap:10px;white-space:nowrap;font-weight:800;color:var(--ink)}
    .logo img{width:38px;height:38px;object-fit:contain}
    .logo span{font-size:18px}
    .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:28px 13px;color:#27344d;font-size:14px;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)}
    .header-btns{display:flex;align-items:center;gap:14px;white-space:nowrap;font-size:14px}
    .header-btns>a{color:var(--theme);font-weight:700}
    .header-btns>a:first-child{padding:9px 13px;background:#edf3ff;border-radius:8px}
    .hamburger{display:none;border:0;background:transparent;padding:8px;cursor:pointer}
    .hamburger span{display:block;width:23px;height:2px;margin:5px 0;background:var(--ink);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)}

    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%);padding-top:8px;opacity:0;visibility:hidden;pointer-events:none;transition:.2s;min-width:280px}
    .mega-menu{width:min(900px,calc(100vw - 32px))}
    .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;pointer-events:auto}
    .dropdown-shell,.mega-shell{background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);padding:22px}
    .dropdown-title,.mega-title{margin:0 0 12px;color:var(--theme);font-size:13px;font-weight:800}
    .dropdown-list{display:grid;gap:8px}
    .dropdown-list a{padding:8px 0;border-bottom:1px solid #eef1f6;font-size:14px}
    .mega-layout{display:grid;grid-template-columns:180px 1fr;gap:25px}
    .mega-category-links{display:grid;gap:8px}
    .mega-category-links a{font-size:13px;color:#4f5e75}
    .mega-category-links a:hover,.dropdown-list a:hover{color:var(--theme)}
    .mega-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
    .mega-card{display:flex;gap:10px;padding:10px;border:1px solid #edf0f5;border-radius:10px;min-width:0}
    .mega-card:hover{border-color:#b8cbee;background:#f8fbff}
    .mega-card>img{width:34px;height:34px;object-fit:contain;border-radius:7px;flex:none}
    .mega-card>span{min-width:0;display:grid;gap:2px;font-size:11px;color:var(--muted)}
    .mega-card strong{font-size:13px;color:var(--ink);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .mega-summary{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .mega-stats{display:flex;flex-wrap:wrap;gap:4px 9px}
    .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}

    .drawer-overlay{position:fixed;inset:0;background:rgba(9,19,37,.55);opacity:0;visibility:hidden;transition:.25s;z-index:50}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;z-index:60;top:0;right:0;width:min(390px,88vw);height:100vh;padding:22px;background:#fff;transform:translateX(100%);transition:.28s;overflow:auto}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:15px;padding-bottom:18px;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:#f1f4f8;width:34px;height:34px;border-radius:50%;font-size:22px;line-height:1;cursor:pointer}
    .drawer-menu{padding-top:12px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;text-align:left;border:0;border-bottom:1px solid #eef1f6;background:transparent;color:var(--ink);font-size:15px;cursor:pointer}
    .drawer-group{border-bottom:1px solid #eef1f6}
    .drawer-toggle{border-bottom:0;position:relative;font-weight:600}
    .drawer-toggle:after{content:"+";position:absolute;right:4px;font-size:20px;color:var(--muted)}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:grid;gap:7px;max-height:0;overflow:hidden;transition:max-height .25s;padding-left:12px}
    .drawer-submenu.open{max-height:500px;padding-bottom:12px}
    .drawer-submenu a{font-size:13px;color:var(--muted);padding:4px 0}

    .footer{margin-top:80px;background:#101a2d;color:#c7d2e5}
    .footer-main{display:grid;grid-template-columns:1.45fr 1fr 1fr 1fr;gap:38px;padding:54px 0 42px}
    .footer .logo{color:#fff;margin-bottom:16px}
    .footer .logo img{background:#fff;border-radius:8px}
    .footer p{margin:0;color:#9eacc1;font-size:13px;line-height:1.9}
    .footer h3{margin:5px 0 17px;color:#fff;font-size:15px}
    .footer-links{display:grid;gap:10px;font-size:13px}
    .footer-links a:hover,.footer-contact a:hover{color:#fff}
    .footer-contact{display:grid;gap:11px;font-size:13px}
    .footer-contact strong{color:#fff;font-weight:600}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;padding:18px 0;border-top:1px solid rgba(255,255,255,.12);color:#8998ae;font-size:12px}

    .video-page{padding:64px 0 20px;background:linear-gradient(180deg,#f5f8fd 0,#fff 55%)}
    .video-heading{text-align:center;max-width:760px;margin:0 auto 38px}
    .video-heading .eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--theme);font-size:13px;font-weight:800;letter-spacing:.12em}
    .video-heading .eyebrow:before{content:"";width:25px;height:2px;background:var(--theme)}
    .video-heading h1{margin:12px 0 12px;font-size:clamp(30px,4vw,48px);line-height:1.2;color:#13233f}
    .video-heading p{margin:0;color:var(--muted);font-size:15px}
    .video-filter{display:flex;justify-content:center;flex-wrap:wrap;gap:10px;margin:0 auto 34px}
    .video-filter a{padding:9px 17px;border:1px solid #dbe3ef;border-radius:999px;background:#fff;color:#53627a;font-size:13px}
    .video-filter a:hover,.video-filter a.active{background:var(--theme);border-color:var(--theme);color:#fff}
    .video-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
    .video-card{overflow:hidden;background:#fff;border:1px solid #e6ebf2;border-radius:var(--radius);box-shadow:0 8px 25px rgba(25,53,92,.06);transition:transform .2s,box-shadow .2s}
    .video-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
    .video-cover{position:relative;aspect-ratio:16/9;background:#dfe7f2;overflow:hidden}
    .video-cover img{width:100%;height:100%;object-fit:cover}
    .video-cover:after{content:"▶";position:absolute;left:18px;bottom:16px;width:38px;height:38px;display:grid;place-items:center;border-radius:50%;background:rgba(11,61,145,.94);color:#fff;font-size:13px;padding-left:2px}
    .video-duration{position:absolute;right:12px;bottom:12px;padding:3px 7px;border-radius:5px;background:rgba(10,20,35,.78);color:#fff;font-size:12px}
    .video-body{padding:19px 20px 21px}
    .video-body h2{font-size:18px;line-height:1.45;margin:0 0 9px;color:#172844}
    .video-body p{display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden;min-height:48px;margin:0 0 15px;color:var(--muted);font-size:13px}
    .video-meta{display:flex;justify-content:space-between;gap:10px;padding-top:13px;border-top:1px solid #edf0f4;color:#8b98aa;font-size:12px}
    .pagination{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin-top:44px}
    .pagination a{min-width:36px;height:36px;display:grid;place-items:center;padding:0 11px;border:1px solid #dbe3ef;border-radius:8px;color:#596a83;background:#fff;font-size:13px}
    .pagination a:hover,.pagination a.active{border-color:var(--theme);background:var(--theme);color:#fff}

    @media (max-width:1120px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-inner{justify-content:space-between}
      .header-btns{margin-left:auto}
      .footer-main{grid-template-columns:repeat(2,1fr)}
    }
    @media (max-width:760px){
      .container{width:min(100% - 28px,1180px)}
      .topbar-inner{padding:7px 0;align-items:flex-start;flex-direction:column;gap:2px}
      .topbar-contact{gap:12px;flex-wrap:wrap}
      .header-inner{height:68px;gap:10px}
      .header-btns>a:first-child{display:none}
      .video-page{padding-top:42px}
      .video-heading{margin-bottom:28px}
      .video-heading h1{font-size:32px}
      .video-grid{grid-template-columns:1fr;gap:17px}
      .footer{margin-top:48px}
      .footer-main{grid-template-columns:1fr;gap:27px;padding:38px 0 30px}
      .footer-bottom{align-items:flex-start;flex-direction:column;gap:6px}
    }
    @media (min-width:761px) and (max-width:980px){
      .video-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
    }