:root{
      --theme:#0B3D91;
      --ink:#101a2d;
      --muted:#64748b;
      --line:#e6ebf2;
      --soft:#f5f8fc;
      --white:#fff;
      --accent:#38bdf8;
      --violet:#6d5dfc;
      --shadow:0 18px 45px rgba(15,37,73,.10);
      --radius:18px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f7f9fc;font-family:"PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.6}
    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:38px;background:#0d1729;color:#b9c7d9;font-size:12px}
    .topbar .container{height:100%;display:flex;align-items:center;justify-content:space-between}
    .topbar-links{display:flex;gap:24px}
    .topbar a{color:#d9e5f5;transition:color .2s}
    .topbar a:hover{color:#7dd3fc}
    .header{position:relative;z-index:20;background:rgba(255,255,255,.97);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;min-width:190px;color:var(--ink);font-weight:800;font-size:19px}
    .logo img{width:34px;height:34px;object-fit:contain;border-radius:9px}
    .main-nav{margin-left:auto}
    .nav-list{display:flex;align-items:stretch;gap:2px;list-style:none;padding:0;margin:0}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:5px;height:76px;padding:0 14px;font-size:14px;font-weight:600;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:calc(100% - 1px);left:50%;transform:translateX(-50%) translateY(8px);width:270px;padding:16px;background:#fff;border:1px solid var(--line);border-radius:0 0 16px 16px;box-shadow:var(--shadow);opacity:0;visibility:hidden;pointer-events:none;transition:.2s}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .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)}
    .dropdown-panel a{display:block;padding:9px 10px;border-radius:8px;font-size:13px}
    .dropdown-panel a:hover{background:var(--soft);color:var(--theme)}
    .mega-menu{width:650px;padding:22px}
    .mega-heading{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:15px;border-bottom:1px solid var(--line);padding-bottom:12px}
    .mega-heading strong{font-size:16px}
    .mega-heading span{color:var(--muted);font-size:12px}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
    .mega-card{display:block;min-width:0;padding:10px;border:1px solid var(--line);border-radius:12px;transition:.2s}
    .mega-card:hover{border-color:#9fc7ef;box-shadow:0 8px 18px rgba(11,61,145,.08);transform:translateY(-2px)}
    .mega-card img{width:100%;height:72px;object-fit:cover;border-radius:8px;background:#edf3fa;margin-bottom:8px}
    .mega-card strong,.mega-card small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .mega-card strong{font-size:13px}
    .mega-card small{font-size:11px;color:var(--muted);margin-top:3px}
    .mega-footer{display:flex;flex-wrap:wrap;gap:8px 16px;margin-top:15px;padding-top:13px;border-top:1px solid var(--line);color:var(--theme);font-size:12px}
    .header-btns{display:flex;align-items:center;gap:12px}
    .member-link{font-size:13px;color:var(--theme);font-weight:700;white-space:nowrap}
    .account-link{padding:9px 16px;background:var(--theme);color:#fff;border-radius:9px;font-size:13px;font-weight:700;white-space:nowrap}
    .account-link:hover{background:#092f72}
    .hamburger{display:none;border:0;background:transparent;padding:7px;cursor:pointer}
    .hamburger span{display:block;width:23px;height:2px;background:var(--ink);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 90px}
    .video-intro{text-align:center;max-width:720px;margin:0 auto 34px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--theme);font-weight:800;font-size:12px;letter-spacing:.12em}
    .eyebrow:before{content:"";width:24px;height:2px;background:var(--accent)}
    .video-intro h1{font-size:clamp(32px,5vw,54px);line-height:1.16;margin:12px 0 15px;letter-spacing:-.04em}
    .video-intro 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;background:#fff;border:1px solid var(--line);border-radius:14px;margin-bottom:25px;box-shadow:0 8px 22px rgba(15,37,73,.04)}
    .video-toolbar strong{font-size:15px}
    .category-pills{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px}
    .category-pills a{padding:6px 12px;border:1px solid #dce5f0;border-radius:999px;color:var(--muted);font-size:12px;background:#fff}
    .category-pills a:hover{color:var(--theme);border-color:#8bb8e8;background:#f4f8ff}
    .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:var(--radius);box-shadow:0 8px 24px rgba(15,37,73,.05);transition:transform .25s,box-shadow .25s}
    .video-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
    .video-cover{position:relative;aspect-ratio:16/9;overflow:hidden;background:linear-gradient(135deg,#15294e,#2275ac)}
    .video-cover img{width:100%;height:100%;object-fit:cover;transition:transform .35s}
    .video-card:hover .video-cover img{transform:scale(1.05)}
    .play-mark{position:absolute;left:18px;bottom:16px;width:42px;height:42px;display:grid;place-items:center;border-radius:50%;background:rgba(255,255,255,.94);color:var(--theme);box-shadow:0 5px 16px rgba(0,0,0,.2)}
    .play-mark:after{content:"";margin-left:3px;border-top:7px solid transparent;border-bottom:7px solid transparent;border-left:10px solid currentColor}
    .duration{position:absolute;right:12px;bottom:12px;padding:3px 8px;background:rgba(5,14,30,.78);color:#fff;border-radius:5px;font-size:11px}
    .video-body{padding:18px 18px 20px}
    .video-body h2{font-size:18px;line-height:1.4;margin:0 0 8px}
    .video-body h2 a:hover{color:var(--theme)}
    .video-summary{display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;overflow:hidden;min-height:72px;margin:0;color:var(--muted);font-size:13px}
    .video-meta{display:flex;justify-content:space-between;gap:10px;margin-top:15px;padding-top:13px;border-top:1px solid var(--line);color:#8a98aa;font-size:12px}
    .video-meta a{color:var(--theme);font-weight:700}
    .pagination{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin-top:42px}
    .pagination a{min-width:36px;height:36px;display:grid;place-items:center;padding:0 12px;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{background:#0d1729;color:#aab9cc;padding:54px 0 22px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.1fr;gap:40px}
    .footer-brand strong{display:block;color:#fff;font-size:20px;margin-bottom:12px}
    .footer p{margin:7px 0;color:#9eafc4;font-size:13px}
    .footer h3{margin:0 0 14px;color:#fff;font-size:14px}
    .footer-grid>div:not(.footer-brand) a,.footer-grid>div:not(.footer-brand) span{display:block;width:max-content;max-width:100%;margin:7px 0;color:#aab9cc;font-size:13px}
    .footer a:hover{color:#7dd3fc}
    .footer-bottom{display:flex;justify-content:space-between;gap:15px;border-top:1px solid rgba(255,255,255,.12);margin-top:38px;padding-top:18px;font-size:12px;color:#8293a9}

    @media (max-width:900px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-btns{margin-left:auto}
      .member-link{display:none}
      .mobile-drawer{display:block;position:fixed;z-index:50;top:0;right:0;width:min(380px,88vw);height:100vh;background:#fff;transform:translateX(105%);transition:transform .3s;box-shadow:-15px 0 40px rgba(0,0,0,.15);overflow:auto}
      .mobile-drawer.open{transform:translateX(0)}
      .drawer-overlay{position:fixed;z-index:40;inset:0;background:rgba(7,18,35,.58);opacity:0;visibility:hidden;transition:.3s}
      .drawer-overlay.open{display:block;opacity:1;visibility:visible}
      .drawer-head{display:flex;align-items:center;gap:14px;padding:22px;border-bottom:1px solid var(--line)}
      .drawer-head strong{margin-right:auto;color:var(--theme)}
      .drawer-head a{padding:7px 13px;background:var(--theme);color:#fff;border-radius:7px;font-size:12px}
      .drawer-close{border:0;background:transparent;font-size:28px;line-height:1;color:var(--muted);cursor:pointer}
      .drawer-menu{padding:10px 22px 30px}
      .drawer-link,.drawer-toggle{display:block;width:100%;padding:15px 0;border:0;border-bottom:1px solid var(--line);background:transparent;text-align:left;color:var(--ink);font-weight:700;cursor:pointer}
      .drawer-toggle:after{content:"+";float:right;color:var(--muted);font-size:20px;font-weight:400}
      .drawer-toggle.active:after{content:"−"}
      .drawer-submenu{display:none;padding:5px 0 8px 15px}
      .drawer-submenu.open{display:block}
      .drawer-submenu a{display:block;padding:9px 0;color:var(--muted);font-size:13px}
      .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{height:auto;padding:9px 0}
      .topbar .container,.topbar-links{gap:5px;align-items:flex-start;flex-direction:column}
      .header-inner{min-height:66px}
      .logo{min-width:0;font-size:16px}
      .logo img{width:30px;height:30px}
      .account-link{padding:8px 11px}
      .video-page{padding:40px 0 65px}
      .video-intro h1{font-size:34px}
      .video-intro p{font-size:14px}
      .video-toolbar{display:block;padding:15px}
      .category-pills{justify-content:flex-start;margin-top:12px}
      .video-grid{grid-template-columns:1fr;gap:16px}
      .video-body h2{font-size:17px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:24px 18px}
      .footer-brand{grid-column:1/-1}
      .footer-bottom{display:block}
      .footer-bottom span{display:block;margin-top:6px}
    }