:root{
      --theme:#0B3D91;
      --ink:#172033;
      --muted:#64748b;
      --line:#dbe3ef;
      --paper:#f6f8fc;
      --white:#fff;
      --accent:#e9b949;
      --shadow:0 16px 42px rgba(15,35,70,.10);
      --radius:16px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;background:var(--paper);color:var(--ink);font-family:"PingFang SC","Microsoft YaHei",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:#10213f;color:#dce7f8;font-size:13px}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar a{color:#fff;margin-left:20px}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:78px;display:flex;align-items:center;gap:28px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;color:var(--theme);font-weight:800;font-size:19px}
    .logo img{width:34px;height:34px;object-fit:contain}
    .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:25px 13px;color:#25344c;font-size:15px;font-weight:600}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"";width:6px;height:6px;border-right:1.5px solid currentColor;border-bottom:1.5px 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 15px 15px;box-shadow:var(--shadow);transition:.2s ease;z-index:30}
    .dropdown-panel{width:310px;padding:20px}
    .mega-menu{width:650px;padding:24px;display:grid;grid-template-columns:1fr 1fr;gap:24px}
    .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:hover:after,.nav-item:focus-within:after{content:"";position:absolute;top:100%;left:0;right:0;height:12px}
    .panel-title{margin-bottom:12px;color:var(--theme);font-size:14px;font-weight:800}
    .panel-link{display:block;padding:8px 0;border-bottom:1px solid #edf1f6;font-size:13px}
    .panel-link:hover{color:var(--theme)}
    .panel-link small{display:block;color:var(--muted);font-size:11px}
    .mega-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
    .mega-card{display:block;padding:12px;border:1px solid var(--line);border-radius:10px;background:#fbfcff}
    .mega-card:hover{border-color:var(--theme);background:#f4f8ff}
    .mega-card img{width:24px;height:24px;object-fit:contain;margin-bottom:5px}
    .mega-card strong{display:block;font-size:13px}
    .mega-card small{display:block;color:var(--muted);font-size:11px;line-height:1.5}
    .mega-section p{margin:0 0 16px;color:var(--muted);font-size:13px}
    .mega-footer{display:inline-block;margin-top:16px;color:var(--theme);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}
    .member-btn{font-size:13px;color:var(--theme);font-weight:700}
    .open-btn{padding:8px 15px;border-radius:8px;background:var(--theme);color:#fff;font-size:13px;font-weight:700}
    .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)}

    .drawer-overlay{position:fixed;inset:0;background:rgba(8,21,42,.48);opacity:0;visibility:hidden;transition:.25s;z-index:50}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:0;width:min(360px,88vw);height:100vh;background:#fff;transform:translateX(100%);transition:.3s ease;z-index:51;overflow:auto}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{height:70px;display:flex;align-items:center;gap:16px;padding:0 20px;border-bottom:1px solid var(--line);color:var(--theme);font-weight:800}
    .drawer-head a{margin-left:auto;color:var(--theme);font-size:14px}
    .drawer-close{border:0;background:transparent;font-size:28px;line-height:1;color:var(--muted);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 #edf1f6;background:none;text-align:left;color:var(--ink);font-weight:700;cursor:pointer}
    .drawer-submenu{display:none;padding:4px 0 8px 15px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:7px 0;color:var(--muted);font-size:14px}
    .drawer-toggle:after{content:"＋";float:right;color:var(--theme)}
    .drawer-toggle.active:after{content:"－"}

    .video-page{padding:62px 0 84px}
    .page-heading{text-align:center;max-width:720px;margin:0 auto 38px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:5px 12px;border-radius:99px;background:#e9f0ff;color:var(--theme);font-size:12px;font-weight:800;letter-spacing:.08em}
    .eyebrow:before{content:"";width:7px;height:7px;border-radius:50%;background:var(--accent)}
    .page-heading h1{margin:16px 0 9px;font-size:clamp(32px,5vw,54px);line-height:1.18;letter-spacing:-.04em}
    .page-heading p{margin:0;color:var(--muted);font-size:16px}
    .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}
    .video-toolbar strong{font-size:18px}
    .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 var(--line);border-radius:99px;color:var(--muted);font-size:12px}
    .video-filter a:hover,.video-filter a.active{border-color:var(--theme);background: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:var(--radius);box-shadow:0 8px 24px rgba(15,35,70,.05);transition:.25s}
    .video-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
    .video-cover{position:relative;aspect-ratio:16/9;background:#dce6f8;overflow:hidden}
    .video-cover img{width:100%;height:100%;object-fit:cover}
    .play-mark{position:absolute;left:18px;bottom:16px;width:42px;height:42px;display:grid;place-items:center;border-radius:50%;background:var(--theme);color:#fff;font-size:17px;box-shadow:0 5px 14px rgba(11,61,145,.35)}
    .duration{position:absolute;right:12px;bottom:12px;padding:2px 7px;border-radius:5px;background:rgba(10,20,35,.78);color:#fff;font-size:11px}
    .video-info{padding:19px 20px 20px}
    .video-info h2{margin:0 0 8px;font-size:18px;line-height:1.45}
    .video-info h2 a:hover{color:var(--theme)}
    .video-info p{display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;overflow:hidden;margin:0 0 14px;color:var(--muted);font-size:13px;line-height:1.7}
    .video-meta{display:flex;justify-content:space-between;gap:10px;color:#8a96a8;font-size:12px}
    .pagination{display:flex;justify-content:center;gap:8px;margin-top:42px}
    .pagination a{min-width:36px;height:36px;display:grid;place-items:center;padding:0 10px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--muted);font-size:13px}
    .pagination a:hover,.pagination a.active{background:var(--theme);border-color:var(--theme);color:#fff}

    .footer{padding:56px 0 22px;background:#101d35;color:#d7e1f0}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:38px}
    .footer-brand{display:inline-block;margin-bottom:12px;color:#fff;font-size:20px;font-weight:800}
    .footer p{margin:7px 0;color:#9eb0c8;font-size:13px}
    .footer h3{margin:0 0 13px;color:#fff;font-size:15px}
    .footer-grid>div:not(:first-child) a{display:block;margin:6px 0;color:#aebdd0;font-size:13px}
    .footer-grid>div:not(:first-child) a:hover{color:#fff}
    .footer-bottom{margin-top:38px;padding-top:18px;border-top:1px solid rgba(255,255,255,.13);color:#8294ad;font-size:12px}

    @media (max-width:900px){
      .main-nav{display:none}
      .hamburger{display:block}
      .member-btn{display:none}
      .header-inner{height:68px}
      .logo{min-width:0}
      .video-grid{grid-template-columns:repeat(2,1fr)}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media (max-width:600px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{align-items:flex-start;flex-direction:column;gap:0;padding:7px 0}
      .topbar a{margin:0 14px 0 0}
      .open-btn{padding:7px 10px}
      .page-heading{margin-bottom:28px}
      .page-heading h1{font-size:36px}
      .video-page{padding:42px 0 60px}
      .video-toolbar{align-items:flex-start;flex-direction:column}
      .video-grid{grid-template-columns:1fr;gap:18px}
      .footer-grid{grid-template-columns:1fr;gap:26px}
      .footer{padding-top:42px}
    }