:root{
      --theme:#0B3D91;
      --theme-dark:#082d6b;
      --ink:#172033;
      --muted:#667085;
      --line:#e5e9f0;
      --soft:#f5f7fb;
      --white:#fff;
      --shadow:0 12px 34px rgba(15,35,75,.08);
      --radius:14px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#fbfcfe;font-family:"Noto Sans SC","Microsoft YaHei",Arial,sans-serif;line-height:1.65}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block}
    button{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:auto}
    .topbar{background:#f1f4f8;color:#647084;font-size:13px;border-bottom:1px solid #e7ebf1}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between}
    .topbar-links{display:flex;gap:22px}
    .topbar a:hover{color:var(--theme)}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{min-height:76px;display:flex;align-items:center;gap:30px}
    .logo{display:flex;align-items:center;gap:10px;white-space:nowrap;color:var(--theme);font-weight:800;font-size:20px}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{margin-left:auto}
    .nav-list{list-style:none;padding:0;margin:0;display:flex;align-items:stretch;gap:3px}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;min-height:76px;padding:0 15px;font-size:15px;color:#354052;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"";width:6px;height:6px;margin-left:8px;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);opacity:0;visibility:hidden;pointer-events:none;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:var(--shadow);transition:.2s;z-index:30}
    .dropdown-panel{width:250px;padding:12px}
    .dropdown-panel a{display:block;padding:9px 11px;border-radius:8px;font-size:14px}
    .dropdown-panel a:hover{background:var(--soft);color:var(--theme)}
    .mega-menu{width:620px;padding:22px}
    .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;transform:translateX(-50%) translateY(0)}
    .nav-item:after{content:"";position:absolute;left:0;right:0;height:12px;top:100%}
    .mega-title{margin:0 0 12px;font-size:14px;font-weight:700;color:var(--theme)}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
    .mega-card{min-height:60px;padding:11px;border:1px solid var(--line);border-radius:10px;background:#fbfcff;font-size:12px}
    .mega-card:hover{border-color:#a9bddf;background:#f1f6ff}
    .mega-card strong{font-size:13px;color:#25324a}
    .mega-card span{color:var(--muted)}
    .mega-card img{width:24px;height:24px;object-fit:contain;margin-bottom:4px}
    .mega-footer{display:block;margin-top:16px;padding-top:13px;border-top:1px solid var(--line);color:var(--theme);font-size:14px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:9px}
    .member-btn,.account-btn{padding:9px 14px;border-radius:8px;font-size:13px}
    .member-btn{color:var(--theme);border:1px solid #cbd8ee}
    .account-btn{color:#fff;background:var(--theme)}
    .member-btn:hover{background:#f1f6ff}.account-btn:hover{background:var(--theme-dark)}
    .hamburger{display:none;width:42px;height:40px;border:1px solid var(--line);background:#fff;border-radius:8px;padding:9px;cursor:pointer}
    .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{display:none;position:fixed;inset:0;background:rgba(10,20,40,.46);z-index:50}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;right:0;top:0;bottom:0;width:min(360px,88vw);background:#fff;z-index:60;transform:translateX(100%);transition:.25s;box-shadow:-12px 0 36px rgba(0,0,0,.15);overflow:auto}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:13px;padding:20px;border-bottom:1px solid var(--line);color:var(--theme);font-weight:700}
    .drawer-head>a{margin-left:auto;color:#fff;background:var(--theme);padding:6px 12px;border-radius:7px;font-size:13px}
    .drawer-close{border:0;background:none;font-size:28px;line-height:1;color:#657188;cursor:pointer}
    .drawer-menu{padding:10px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;text-align:left;border:0;border-bottom:1px solid #eef1f5;background:none;color:#28364d;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:19px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{max-height:0;overflow:hidden;transition:.2s;padding-left:15px}
    .drawer-submenu.open{max-height:500px}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:14px}
    .footer{margin-top:70px;background:#101a2d;color:#c4ccda;padding:52px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.25fr;gap:38px}
    .footer h3{margin:0 0 15px;color:#fff;font-size:20px}
    .footer h4{margin:0 0 15px;color:#fff;font-size:15px}
    .footer p{margin:7px 0;font-size:13px}
    .footer-grid>div>a{display:block;margin:8px 0;color:#c4ccda;font-size:13px}
    .footer-grid>div>a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid rgba(255,255,255,.13);margin-top:35px;padding-top:18px;font-size:12px;color:#9da8bb}
    
    .video-page{padding:54px 0 10px}
    .video-heading{text-align:center;max-width:720px;margin:0 auto 34px}
    .video-heading .eyebrow{display:inline-block;padding:5px 12px;border-radius:30px;background:#eaf1fc;color:var(--theme);font-size:13px;font-weight:700}
    .video-heading h1{margin:13px 0 10px;font-size:clamp(30px,4vw,46px);letter-spacing:-.03em;color:#17233a}
    .video-heading p{margin:0;color:var(--muted);font-size:16px}
    .video-toolbar{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:16px 20px;margin-bottom:24px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 6px 20px rgba(15,35,75,.04)}
    .video-toolbar strong{font-size:15px}
    .video-toolbar span{font-size:13px;color:var(--muted)}
    .video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
    .video-card{overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 7px 24px rgba(15,35,75,.055);transition:.2s}
    .video-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#b7c9e6}
    .video-cover{position:relative;aspect-ratio:16/9;background:#dce6f5;overflow:hidden}
    .video-cover img{width:100%;height:100%;object-fit:cover}
    .play-mark{position:absolute;left:50%;top:50%;width:46px;height:46px;transform:translate(-50%,-50%);border-radius:50%;display:grid;place-items:center;background:rgba(11,61,145,.92);color:#fff;font-size:19px;padding-left:3px}
    .duration{position:absolute;right:10px;bottom:9px;padding:2px 7px;border-radius:5px;background:rgba(0,0,0,.7);color:#fff;font-size:12px}
    .video-body{padding:17px}
    .video-body h2{font-size:18px;line-height:1.45;margin:0 0 8px;color:#1d2b43}
    .video-body p{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;min-height:4.8em;margin:0 0 13px;color:var(--muted);font-size:14px}
    .video-meta{display:flex;align-items:center;justify-content:space-between;color:#8490a3;font-size:12px}
    .video-meta a{color:var(--theme);font-weight:700}
    .pagination{display:flex;justify-content:center;gap:8px;margin:38px 0 5px}
    .pagination a{min-width:36px;padding:7px 11px;text-align:center;border:1px solid var(--line);border-radius:7px;background:#fff;color:#536177;font-size:13px}
    .pagination a:hover,.pagination a.active{background:var(--theme);border-color:var(--theme);color:#fff}
    @media(max-width:1050px){
      .main-nav{display:none}.hamburger{display:block}.header-btns{margin-left:auto}.mega-menu{left:auto;right:0;transform:translateY(8px)}
      .nav-item:hover>.mega-menu,.nav-item:focus-within>.mega-menu{transform:translateY(0)}
    }
    @media(max-width:760px){
      .container{width:min(100% - 28px,620px)}
      .topbar .container{align-items:flex-start;flex-direction:column;padding:8px 0;gap:2px}
      .topbar-links{gap:12px;font-size:12px}
      .header-inner{min-height:66px;gap:10px}.logo{font-size:17px}.logo img{width:32px;height:32px}
      .member-btn{display:none}.account-btn{font-size:12px;padding:8px 10px}
      .video-page{padding-top:35px}.video-grid{grid-template-columns:1fr;gap:16px}.video-heading h1{font-size:32px}
      .video-heading p{font-size:14px}.video-toolbar{align-items:flex-start;flex-direction:column;gap:4px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:25px}.footer-bottom{display:block}.footer-bottom span{display:block;margin-top:8px}
    }
    @media(max-width:460px){
      .footer-grid{grid-template-columns:1fr}.header-btns{gap:5px}
    }