:root{--theme:#0B3D91;--ink:#152033;--muted:#667085;--line:#e7ebf1;--paper:#f5f7fb;--gold:#f1bf55}
    *{box-sizing:border-box}
    html,body{margin:0;padding:0;color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;background:var(--paper);line-height:1.6}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block}
    .container{width:min(1180px,calc(100% - 40px));margin:auto}
    .topbar{background:#0d1728;color:#c9d3e2;font-size:13px}
    .topbar .container{height:36px;display:flex;align-items:center;justify-content:space-between}
    .topbar a{margin-left:20px;color:#dfe7f1}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:78px;display:flex;align-items:center;gap:34px}
    .logo{display:flex;align-items:center;gap:10px;white-space:nowrap;font-weight:800;font-size:18px;color:var(--theme)}
    .logo img{width:36px;height:36px;object-fit:contain}
    .main-nav{margin-left:auto}
    .nav-list{display:flex;align-items:stretch;gap:4px;list-style:none;padding:0;margin:0}
    .nav-item{position:relative}
    .nav-link{display:block;padding:27px 13px;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"⌄";font-size:12px;margin-left:6px;color:#8b96a7}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%);width:310px;background:#fff;border:1px solid var(--line);border-radius:0 0 12px 12px;box-shadow:0 16px 38px rgba(23,38,65,.14);padding:16px;opacity:0;visibility:hidden;pointer-events:none;transition:.2s}
    .mega-menu{width:620px}
    .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-panel a:not(.mega-footer){display:block;padding:9px 10px;border-bottom:1px solid #f0f2f5;font-size:14px}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
    .mega-card{min-width:0;padding:10px;border:1px solid #edf0f5;border-radius:9px;background:#fbfcfe}
    .mega-card img{height:54px;width:100%;object-fit:cover;border-radius:6px;margin-bottom:7px}
    .mega-card strong,.mega-card small{display:block;overflow:hidden}
    .mega-card strong{font-size:13px;white-space:nowrap;text-overflow:ellipsis}
    .mega-card small{font-size:11px;color:var(--muted);line-height:1.45;margin-top:4px}
    .mega-footer{display:block;margin-top:13px;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:12px;margin-left:8px;white-space:nowrap}
    .account-link{background:var(--theme);color:#fff;padding:9px 14px;border-radius:7px;font-size:13px}
    .hamburger{display:none;border:0;background:none;padding:7px;cursor:pointer}
    .hamburger span{display:block;width:24px;height:2px;background:#172033;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{display:none}
    .mobile-drawer{display:none}
    .video-page{padding:58px 0 80px}
    .video-heading{text-align:center;max-width:760px;margin:0 auto 36px}
    .eyebrow{display:inline-block;color:var(--theme);font-size:13px;font-weight:700;letter-spacing:.14em;margin-bottom:10px}
    .video-heading h1{font-size:42px;line-height:1.2;margin:0 0 14px;color:#111d32}
    .video-heading p{margin:0;color:var(--muted);font-size:16px}
    .category-tabs{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin:0 auto 34px}
    .category-tabs a{padding:8px 18px;border:1px solid #d9e1ed;border-radius:999px;background:#fff;color:#536176;font-size:14px}
    .category-tabs a:hover,.category-tabs a.active{background:var(--theme);border-color:var(--theme);color:#fff}
    .video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
    .video-card{overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 8px 24px rgba(22,40,70,.05);transition:.2s}
    .video-card:hover{transform:translateY(-4px);box-shadow:0 14px 30px rgba(22,40,70,.12)}
    .video-cover{position:relative;aspect-ratio:16/9;background:#101b2e;overflow:hidden}
    .video-cover img{width:100%;height:100%;object-fit:cover}
    .play-mark{position:absolute;left:18px;bottom:16px;width:38px;height:38px;border-radius:50%;display:grid;place-items:center;background:rgba(11,61,145,.94);color:#fff;font-size:17px}
    .duration{position:absolute;right:12px;bottom:12px;padding:3px 7px;border-radius:4px;background:rgba(0,0,0,.72);color:#fff;font-size:12px}
    .video-body{padding:18px 19px 20px}
    .video-body h2{font-size:19px;line-height:1.4;margin:0 0 9px}
    .video-body h2 a:hover{color:var(--theme)}
    .video-body p{color:var(--muted);font-size:14px;margin:0 0 14px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
    .video-meta{display:flex;justify-content:space-between;gap:10px;color:#8994a5;font-size:12px;border-top:1px solid #edf0f4;padding-top:12px}
    .pagination{display:flex;justify-content:center;gap:8px;margin-top:42px;flex-wrap:wrap}
    .pagination a{min-width:38px;padding:7px 12px;text-align:center;border:1px solid #dbe2ec;background:#fff;border-radius:6px;color:#56657b;font-size:14px}
    .pagination a:hover,.pagination a.current,.pagination a.active{background:var(--theme);border-color:var(--theme);color:#fff}
    .footer{background:#111d31;color:#c7d0dd;padding:52px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.45fr 1fr 1fr 1fr;gap:35px}
    .footer h3{color:#fff;font-size:16px;margin:0 0 15px}
    .footer p{font-size:13px;line-height:1.8;margin:0 0 8px}
    .footer a{display:block;color:#c7d0dd;font-size:13px;margin:7px 0}
    .footer a:hover{color:#fff}
    .footer-bottom{border-top:1px solid rgba(255,255,255,.13);margin-top:35px;padding-top:18px;font-size:12px;color:#8e9bad}
    @media(max-width:1000px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-btns{margin-left:auto}
      .video-grid{grid-template-columns:repeat(2,1fr)}
      .mobile-drawer{display:block;position:fixed;z-index:50;right:0;top:0;width:min(390px,88vw);height:100vh;background:#fff;transform:translateX(105%);transition:.25s;overflow:auto;box-shadow:-10px 0 30px rgba(0,0,0,.15)}
      .mobile-drawer.open{transform:translateX(0)}
      .drawer-overlay{display:block;position:fixed;z-index:45;inset:0;background:rgba(8,20,38,.48);opacity:0;visibility:hidden;transition:.25s}
      .drawer-overlay.open{opacity:1;visibility:visible}
      .drawer-head{display:flex;align-items:center;gap:15px;padding:20px;border-bottom:1px solid var(--line);font-weight:700}
      .drawer-head>a{margin-left:auto;color:var(--theme)}
      .drawer-close{border:0;background:none;font-size:28px;color:#526176;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 #eef1f5;background:none;text-align:left;font-size:15px;color:var(--ink)}
      .drawer-toggle{cursor:pointer;font-weight:600}
      .drawer-toggle:after{content:"＋";float:right;color:#8995a7}
      .drawer-toggle.active:after{content:"－"}
      .drawer-submenu{display:none;padding:4px 0 8px 14px}
      .drawer-submenu.open{display:block}
      .drawer-submenu a{display:block;padding:8px 0;font-size:14px;color:var(--muted)}
    }
    @media(max-width:640px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{height:auto;min-height:36px;padding:7px 0;align-items:flex-start;gap:5px;flex-direction:column}
      .topbar a{margin:0 14px 0 0}
      .header-inner{height:68px}
      .account-link{display:none}
      .video-page{padding:42px 0 60px}
      .video-heading h1{font-size:31px}
      .video-heading p{font-size:14px}
      .video-grid{grid-template-columns:1fr;gap:18px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:24px}
      .footer-grid>div:first-child{grid-column:1/-1}
    }