:root{
      --theme:#0B3D91;
      --ink:#17233d;
      --muted:#68758d;
      --line:#e4eaf2;
      --soft:#f4f7fb;
      --white:#fff;
      --shadow:0 14px 40px rgba(20,48,92,.09);
      --radius:16px;
    }
    *{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:1.7}
    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{height:36px;background:#f5f7fa;color:#64718a;font-size:12px;border-bottom:1px solid #e8edf4}
    .topbar .container{height:100%;display:flex;align-items:center;justify-content:space-between}
    .topbar-links{display:flex;gap:20px}
    .topbar a:hover{color:var(--theme)}

    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{min-height:78px;display:flex;align-items:center;gap:30px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;color:var(--theme);font-weight:800;font-size:18px}
    .logo img{width:34px;height:34px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:stretch;justify-content:center;gap:4px;list-style:none;margin:0;padding:0}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:5px;padding:26px 13px;color:#33415c;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)}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(8px);width:330px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s ease}
    .mega-menu{width:650px}
    .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;transform:translateX(-50%) translateY(0)}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .panel-title{margin:0 0 14px;color:var(--theme);font-size:15px}
    .panel-list{display:grid;gap:9px}
    .panel-list a{display:flex;justify-content:space-between;gap:12px;color:#46536c;font-size:13px}
    .panel-list a:hover,.mega-card:hover{color:var(--theme)}
    .panel-list small{color:#9aa5b7;white-space:nowrap}
    .mega-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:26px}
    .mega-cards{display:grid;grid-template-columns:1fr 1fr;gap:10px}
    .mega-card{display:flex;flex-direction:column;gap:3px;padding:11px;border:1px solid var(--line);border-radius:10px;background:#fbfcfe;color:#33415c}
    .mega-card img{width:24px;height:24px;object-fit:contain;margin-bottom:2px}
    .mega-card strong{font-size:13px}
    .mega-card small{font-size:11px;color:var(--muted);line-height:1.5}
    .mega-footer{display:inline-block;margin-top:18px;color:var(--theme);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:9px;white-space:nowrap}
    .member-btn,.open-btn{padding:8px 13px;border-radius:7px;font-size:13px}
    .member-btn{color:var(--theme);border:1px solid #cbd8ec}
    .open-btn{color:#fff;background:var(--theme)}
    .hamburger{display:none;width:42px;height:40px;border:1px solid var(--line);border-radius:8px;background:#fff;padding:9px}
    .hamburger span{display:block;height:2px;margin:4px 0;background:var(--theme);transition:.2s}

    .drawer-overlay{display:none}
    .mobile-drawer{position:fixed;z-index:50;top:0;right:-360px;width:min(360px,88vw);height:100vh;overflow:auto;background:#fff;box-shadow:-10px 0 30px rgba(0,0,0,.12);transition:right .25s ease}
    .mobile-drawer.open{right:0}
    .drawer-overlay.open{display:block;position:fixed;z-index:40;inset:0;background:rgba(12,28,54,.45)}
    .drawer-head{display:flex;align-items:center;gap:12px;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:5px 12px;border-radius:6px;font-size:13px}
    .drawer-close{border:0;background:none;color:#64718a;font-size:27px;line-height:1;cursor:pointer}
    .drawer-menu{padding:10px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid #edf0f5;background:none;text-align:left;color:#263650;font-size:15px;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:#8b97aa;font-size:20px}
    .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:7px 0;color:#68758d;font-size:13px}

    .video-page{padding:56px 0 76px;background:linear-gradient(180deg,#f7faff 0,#fff 420px)}
    .video-heading{text-align:center;margin-bottom:34px}
    .video-heading .eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--theme);font-size:13px;font-weight:700;letter-spacing:1px}
    .video-heading .eyebrow:before{content:"";width:24px;height:2px;background:var(--theme)}
    .video-heading h1{margin:12px 0 9px;font-size:clamp(28px,4vw,46px);letter-spacing:1px;color:#152746}
    .video-heading p{max-width:650px;margin:0 auto;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:8px 17px;border:1px solid #dbe3ef;border-radius:999px;background:#fff;color:#68758d;font-size:13px}
    .video-filter a:first-child,.video-filter a:hover{border-color:var(--theme);color:var(--theme);background:#eef4ff}
    .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(22,53,98,.06);transition:.2s ease}
    .video-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
    .video-cover{position:relative;aspect-ratio:16/9;overflow:hidden;background:#dfe8f5}
    .video-cover img{width:100%;height:100%;object-fit:cover;transition:.3s ease}
    .video-card:hover .video-cover img{transform:scale(1.04)}
    .play-mark{position:absolute;left:18px;bottom:16px;width:42px;height:42px;display:grid;place-items:center;border-radius:50%;background:rgba(11,61,145,.92);color:#fff;font-size:18px;padding-left:3px}
    .duration{position:absolute;right:12px;bottom:12px;padding:2px 7px;border-radius:4px;background:rgba(12,25,49,.78);color:#fff;font-size:11px}
    .video-body{padding:18px 19px 20px}
    .video-body h2{margin:0 0 8px;font-size:17px;line-height:1.45;color:#203452}
    .video-body h2 a:hover{color:var(--theme)}
    .video-body p{display:-webkit-box;overflow:hidden;-webkit-box-orient:vertical;-webkit-line-clamp:3;min-height:72px;margin:0 0 15px;color:#748096;font-size:13px;line-height:1.8}
    .video-meta{display:flex;justify-content:space-between;align-items:center;padding-top:12px;border-top:1px solid #edf1f6;color:#97a1b1;font-size:12px}
    .video-meta a{color:var(--theme);font-weight:700}
    .pagination{display:flex;justify-content:center;gap:8px;margin-top:42px}
    .pagination a{min-width:36px;padding:7px 11px;border:1px solid var(--line);border-radius:7px;text-align:center;color:#68758d;font-size:13px}
    .pagination a:hover,.pagination a.current,.pagination a.active{border-color:var(--theme);background:var(--theme);color:#fff}

    .footer{padding:48px 0 0;background:#14233d;color:#bdc8d9}
    .footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:38px;padding-bottom:38px}
    .footer h3{margin:0 0 14px;color:#fff;font-size:15px}
    .footer-brand strong{display:block;margin-bottom:12px;color:#fff;font-size:20px}
    .footer p{margin:6px 0;font-size:13px;line-height:1.8}
    .footer a{display:block;margin:7px 0;color:#bdc8d9;font-size:13px}
    .footer a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;padding:18px 0;border-top:1px solid rgba(255,255,255,.12);font-size:12px;color:#8f9db4}

    @media (max-width:900px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-inner{min-height:68px;gap:12px}
      .logo{min-width:0;margin-right:auto}
      .member-btn{display:none}
      .video-grid{grid-template-columns:repeat(2,1fr)}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media (max-width:620px){
      .container{width:min(100% - 28px,1180px)}
      .topbar{height:auto;padding:7px 0}
      .topbar .container{align-items:flex-start;gap:4px;flex-direction:column}
      .topbar-links{gap:12px}
      .open-btn{display:none}
      .video-page{padding:40px 0 58px}
      .video-heading{margin-bottom:25px}
      .video-heading h1{font-size:30px}
      .video-grid{grid-template-columns:1fr;gap:18px}
      .video-body p{min-height:auto}
      .footer-grid{grid-template-columns:1fr 1fr;gap:25px 18px}
      .footer-brand{grid-column:1/-1}
      .footer-bottom{display:block}
      .footer-bottom span{display:block;margin:5px 0}
    }