:root{--primary:#0B3D91;--primary-dark:#072b68;--accent:#00d4ff;--ink:#10213a;--muted:#687991;--line:#dfe7f1;--soft:#f4f7fb;--white:#fff;--shadow:0 18px 45px rgba(11,61,145,.12)}
    *{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:1.65}
    body,button,input{font-family:inherit}
    img{display:block;max-width:100%}
    a{color:inherit;text-decoration:none}
    button{color:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .topbar{position:relative;z-index:102;background:#061c3e;color:#c8d8ee;font-size:13px}
    .topbar-inner{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-links{display:flex;align-items:center;gap:22px}
    .topbar a:hover{color:#fff}
    .header{position:relative;z-index:100;background:rgba(255,255,255,.98);border-bottom:1px solid #e7edf5;box-shadow:0 8px 25px rgba(12,38,75,.05)}
    .header-inner{height:78px;display:flex;align-items:center;gap:25px}
    .logo{display:flex;align-items:center;gap:10px;min-width:170px;color:var(--primary);font-size:20px;font-weight:800}
    .logo img{width:42px;height:42px;object-fit:contain}
    .main-nav{height:100%;margin-left:auto}
    .nav-list{height:100%;display:flex;align-items:center;gap:2px;margin:0;padding:0;list-style:none}
    .nav-item{position:relative;height:100%;display:flex;align-items:center}
    .nav-link{height:100%;display:flex;align-items:center;padding:0 13px;color:#263a55;font-size:15px;font-weight:600;white-space:nowrap}
    .nav-link:hover,.nav-item:focus-within>.nav-link{color:var(--primary)}
    .has-arrow:after{content:"";width:6px;height:6px;margin:-4px 0 0 7px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg)}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:0;z-index:110;visibility:hidden;opacity:0;transform:translateY(9px);transition:.2s ease;background:#fff;border:1px solid #e3eaf3;border-radius:0 0 16px 16px;box-shadow:0 24px 55px rgba(8,32,72,.16);pointer-events:none}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;bottom:100%;height:8px}
    .nav-item:hover>.dropdown-panel,.nav-item:hover>.mega-menu,.nav-item:focus-within>.dropdown-panel,.nav-item:focus-within>.mega-menu{visibility:visible;opacity:1;transform:none;pointer-events:auto}
    .dropdown-panel{width:310px;padding:18px}
    .dropdown-title,.mega-heading{margin-bottom:11px;color:var(--primary);font-weight:800}
    .dropdown-panel>a{display:block;padding:9px 10px;border-radius:8px;color:#52647b;font-size:13px}
    .dropdown-panel>a:hover{color:var(--primary);background:#f0f5fc}
    .mega-menu{width:720px;padding:22px}
    .nav-item:nth-last-child(-n+3) .mega-menu{left:auto;right:0}
    .mega-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px}
    .mega-list{display:grid;gap:7px}
    .mega-list>a{min-width:0;display:flex;align-items:center;gap:10px;padding:8px;border-radius:10px}
    .mega-list>a:hover{background:#f1f6fc}
    .mega-list img{flex:0 0 auto;width:38px;height:38px;border-radius:8px;object-fit:cover;background:#eef3f9}
    .mega-list a>span{min-width:0}
    .mega-item-title,.mega-item-meta{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .mega-item-title{color:#24364e;font-size:13px;font-weight:700}
    .mega-item-meta{color:#8290a4;font-size:11px}
    .mega-categories{display:grid;grid-template-columns:1fr 1fr;gap:8px}
    .mega-categories a,.mega-tools span{padding:9px 11px;color:#53667f;background:#f4f7fb;border-radius:8px;font-size:13px}
    .mega-categories a:hover{color:#fff;background:var(--primary)}
    .mega-tools{display:flex;flex-wrap:wrap;gap:8px}
    .mega-footer{display:inline-flex;margin-top:16px;color:var(--primary);font-size:13px;font-weight:800}
    .header-btns{display:flex;align-items:center;gap:9px}
    .member-link{color:var(--primary);font-size:14px;font-weight:700;white-space:nowrap}
    .account-btn{padding:10px 16px;color:#fff;background:var(--primary);border-radius:9px;font-size:14px;font-weight:700;white-space:nowrap}
    .account-btn:hover{background:var(--primary-dark)}
    .hamburger{width:42px;height:42px;display:none;align-items:center;justify-content:center;flex-direction:column;gap:5px;padding:0;background:#f0f4fa;border:0;border-radius:9px;cursor:pointer}
    .hamburger span{width:20px;height:2px;background:var(--primary);transition:.2s}
    .hamburger.active span:first-child{transform:translateY(7px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:last-child{transform:translateY(-7px) rotate(-45deg)}
    .drawer-overlay{position:fixed;inset:0;z-index:199;visibility:hidden;opacity:0;background:rgba(3,15,34,.62);transition:.25s}
    .drawer-overlay.open{visibility:visible;opacity:1}
    .mobile-drawer{position:fixed;top:0;right:0;z-index:200;width:min(390px,90vw);height:100vh;overflow-y:auto;background:#fff;transform:translateX(105%);transition:.28s ease;box-shadow:-25px 0 60px rgba(0,0,0,.18)}
    .mobile-drawer.open{transform:none}
    .drawer-head{min-height:72px;display:flex;align-items:center;gap:13px;padding:14px 20px;color:#fff;background:var(--primary)}
    .drawer-head>span{margin-right:auto;font-weight:700}
    .drawer-head>a{padding:7px 13px;color:var(--primary);background:#fff;border-radius:7px;font-weight:700}
    .drawer-close{padding:0;color:#fff;background:transparent;border:0;font-size:30px;line-height:1;cursor:pointer}
    .drawer-menu{padding:13px 20px 30px}
    .drawer-link,.drawer-toggle{width:100%;display:flex;align-items:center;justify-content:space-between;padding:14px 4px;background:none;border:0;border-bottom:1px solid #e7edf5;text-align:left;font-size:15px;font-weight:700;cursor:pointer}
    .drawer-toggle:after{content:"+";color:var(--primary);font-size:20px;font-weight:400}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:6px 0 8px 13px;border-bottom:1px solid #e7edf5}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:9px 8px;color:#63738a;font-size:14px}
    .drawer-submenu a:hover{color:var(--primary)}
    .video-page{min-height:650px;background:linear-gradient(180deg,#071b3c 0,#0b2e62 330px,#f4f7fb 330px,#f4f7fb 100%)}
    .video-page .video-intro{padding:70px 0 52px;color:#fff;text-align:center}
    .video-page .eyebrow{display:inline-flex;align-items:center;gap:8px;margin-bottom:16px;padding:7px 13px;border:1px solid rgba(0,212,255,.35);border-radius:999px;color:#8beaff;background:rgba(0,212,255,.08);font-size:13px;font-weight:700}
    .video-page .eyebrow:before{content:"";width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 14px var(--accent)}
    .video-page h1{margin:0;font-size:clamp(34px,5vw,58px);line-height:1.15;letter-spacing:-1px}
    .video-page .intro-text{max-width:710px;margin:18px auto 0;color:#b9c9df;font-size:16px}
    .video-page .category-panel{margin-top:34px;padding:16px;border:1px solid rgba(255,255,255,.14);border-radius:18px;background:rgba(255,255,255,.09);box-shadow:0 18px 40px rgba(0,0,0,.18);backdrop-filter:blur(15px)}
    .video-page .category-list{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:9px}
    .video-page .category-list a{padding:9px 16px;border:1px solid rgba(255,255,255,.16);border-radius:999px;color:#e9f4ff;background:rgba(4,18,42,.35);font-size:14px;transition:.2s}
    .video-page .category-list a:hover{border-color:var(--accent);color:#041a39;background:var(--accent)}
    .video-page .video-content{padding:50px 0 78px}
    .video-page .section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:25px;margin-bottom:24px}
    .video-page .section-head h2{margin:0;color:#122846;font-size:28px}
    .video-page .section-head p{margin:5px 0 0;color:var(--muted)}
    .video-page .video-count{padding:7px 12px;border:1px solid var(--line);border-radius:999px;color:var(--primary);background:#fff;font-size:13px;font-weight:700}
    .video-page .video-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
    .video-page .video-card{min-width:0;overflow:hidden;background:#fff;border:1px solid #e1e8f1;border-radius:17px;box-shadow:0 10px 28px rgba(13,48,91,.07);transition:.25s}
    .video-page .video-card:hover{transform:translateY(-6px);border-color:#b7c9e2;box-shadow:var(--shadow)}
    .video-page .video-cover{position:relative;aspect-ratio:16/9;overflow:hidden;background:#0a244c}
    .video-page .video-cover img{width:100%;height:100%;object-fit:cover;transition:.35s}
    .video-page .video-card:hover .video-cover img{transform:scale(1.045)}
    .video-page .video-cover:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 45%,rgba(2,13,31,.7))}
    .video-page .play-icon{position:absolute;top:50%;left:50%;z-index:2;width:50px;height:50px;display:grid;place-items:center;border:1px solid rgba(255,255,255,.6);border-radius:50%;color:#fff;background:rgba(11,61,145,.78);box-shadow:0 0 0 7px rgba(255,255,255,.12);transform:translate(-50%,-50%)}
    .video-page .play-icon:before{content:"";margin-left:4px;border-top:7px solid transparent;border-bottom:7px solid transparent;border-left:11px solid #fff}
    .video-page .duration{position:absolute;right:11px;bottom:10px;z-index:2;padding:3px 8px;border-radius:5px;color:#fff;background:rgba(0,0,0,.72);font-size:12px}
    .video-page .video-body{padding:19px 19px 21px}
    .video-page .video-label{display:inline-block;margin-bottom:9px;color:var(--primary);font-size:12px;font-weight:800}
    .video-page .video-title{margin:0;color:#162b47;font-size:18px;line-height:1.45}
    .video-page .video-title a:hover{color:var(--primary)}
    .video-page .video-summary{min-height:48px;margin:10px 0 15px;overflow:hidden;color:#6c7b90;font-size:14px;line-height:1.7;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
    .video-page .watch-link{display:inline-flex;align-items:center;gap:7px;color:var(--primary);font-size:14px;font-weight:800}
    .video-page .watch-link:after{content:"→";transition:.2s}
    .video-page .video-card:hover .watch-link:after{transform:translateX(4px)}
    .video-page .pagination{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:8px;margin-top:42px}
    .video-page .pagination a{min-width:42px;height:42px;display:grid;place-items:center;padding:0 13px;border:1px solid #d8e2ee;border-radius:9px;color:#4f627a;background:#fff;font-size:14px;font-weight:700}
    .video-page .pagination a:hover,.video-page .pagination a.active,.video-page .pagination a.current{color:#fff;border-color:var(--primary);background:var(--primary)}
    .video-page .video-note{display:grid;grid-template-columns:1fr auto;align-items:center;gap:24px;margin-top:52px;padding:27px 30px;border-radius:18px;color:#fff;background:linear-gradient(120deg,var(--primary),#075f9d);box-shadow:var(--shadow)}
    .video-page .video-note h3{margin:0 0 5px;font-size:22px}
    .video-page .video-note p{margin:0;color:#c8ddf4}
    .video-page .video-note a{padding:11px 18px;border-radius:9px;color:var(--primary);background:#fff;font-weight:800;white-space:nowrap}
    .footer{padding:58px 0 0;color:#c3d0e0;background:#06172f}
    .footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.1fr;gap:42px;padding-bottom:40px}
    .footer-brand img{width:48px;height:48px;object-fit:contain;margin-bottom:12px}
    .footer-brand h3,.footer h4{margin:0 0 14px;color:#fff}
    .footer-brand p{max-width:330px;margin:0;color:#91a4bc;font-size:14px}
    .footer-links,.footer-contact{display:grid;gap:9px;color:#9eb0c6;font-size:14px}
    .footer-links a:hover{color:#fff}
    .footer-bottom{min-height:70px;display:flex;align-items:center;justify-content:space-between;gap:20px;border-top:1px solid rgba(255,255,255,.1);color:#8397b1;font-size:13px}
    @media(max-width:1080px){
      .main-nav{display:none}
      .hamburger{display:flex}
      .header-inner{height:70px}
      .header-btns{margin-left:auto}
      .video-page .video-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media(max-width:700px){
      .container{width:min(100% - 28px,1180px)}
      .topbar-inner{min-height:44px}
      .topbar-inner>span{display:none}
      .topbar-links{width:100%;justify-content:space-between;gap:10px;font-size:12px}
      .logo{min-width:0;font-size:17px}
      .logo img{width:37px;height:37px}
      .member-link{display:none}
      .account-btn{padding:9px 11px;font-size:12px}
      .video-page{background:linear-gradient(180deg,#071b3c 0,#0b2e62 350px,#f4f7fb 350px)}
      .video-page .video-intro{padding:48px 0 38px}
      .video-page .intro-text{font-size:14px}
      .video-page .category-panel{margin-top:25px}
      .video-page .category-list{justify-content:flex-start;flex-wrap:nowrap;overflow-x:auto;padding-bottom:3px}
      .video-page .category-list a{flex:0 0 auto}
      .video-page .video-content{padding:38px 0 60px}
      .video-page .section-head{align-items:flex-start;flex-direction:column;gap:10px}
      .video-page .video-grid{grid-template-columns:1fr}
      .video-page .video-note{grid-template-columns:1fr;padding:23px}
      .video-page .video-note a{justify-self:start}
      .footer-grid{grid-template-columns:1fr;gap:30px}
      .footer-bottom{align-items:flex-start;flex-direction:column;padding:20px 0}
    }