:root{
      --primary:#0B3D91;
      --teal:#0891B2;
      --ink:#172033;
      --muted:#667085;
      --line:#dce6ef;
      --paper:#f4f8fb;
      --white:#fff;
      --shadow:0 18px 45px rgba(18,52,86,.10);
      --radius:18px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans TC","PingFang TC",Arial,sans-serif;line-height:1.7}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}

    .topbar{background:#102a43;color:#d9e8f3;font-size:13px}
    .topbar .container{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-links{display:flex;gap:20px}
    .topbar a:hover{color:#7dd3fc}

    .header{position:relative;z-index:20;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line);box-shadow:0 5px 20px rgba(22,54,80,.05)}
    .header-inner{min-height:78px;display:flex;align-items:center;gap:30px}
    .logo{display:flex;align-items:center;gap:10px;min-width:max-content;color:var(--primary);font-weight:800;font-size:20px}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{list-style:none;padding:0;margin:0;display:flex;align-items:stretch;justify-content:center;gap:3px}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;min-height:78px;padding:0 14px;color:#27364b;font-size:14px;font-weight:650;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--teal)}
    .has-arrow:after{content:"⌄";font-size:14px;margin-left:6px;color:#8ba0b2}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% + 1px);left:50%;transform:translateX(-50%) translateY(8px);width:285px;padding:18px;background:#fff;border:1px solid var(--line);border-radius:0 0 16px 16px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s ease;z-index:30}
    .mega-menu{width:min(620px,calc(100vw - 30px))}
    .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;transform:translateX(-50%) translateY(0)}
    .dropdown-panel>a:not(.mega-footer){display:block;padding:8px 4px;border-bottom:1px solid #edf2f6;font-size:14px}
    .dropdown-panel>a:hover,.mega-card:hover{color:var(--teal)}
    .mega-title{margin:0 0 12px;color:var(--primary);font-size:14px;font-weight:800}
    .mega-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}
    .mega-card{display:block;min-height:70px;padding:11px;border:1px solid #e5edf3;border-radius:11px;background:#fbfdff}
    .mega-card img{width:24px;height:24px;object-fit:contain;margin-bottom:5px}
    .mega-card strong,.mega-card small{display:block}
    .mega-card strong{font-size:13px;line-height:1.45}
    .mega-card small{margin-top:3px;color:var(--muted);font-size:11px;line-height:1.45}
    .mega-footer{display:block;margin-top:14px;padding-top:11px;border-top:1px solid var(--line);color:var(--primary);font-weight:700;font-size:13px}
    .header-btns{display:flex;align-items:center;gap:8px;white-space:nowrap}
    .member-btn,.open-btn{padding:9px 13px;border-radius:9px;font-size:13px;font-weight:700}
    .member-btn{color:var(--primary);background:#e8f2fa}
    .open-btn{color:#fff;background:var(--primary)}
    .hamburger{display:none;width:42px;height:40px;border:0;background:transparent;cursor:pointer;padding:9px}
    .hamburger span{display:block;height:2px;background:var(--primary);margin:5px 0;transition:.2s}

    .drawer-overlay{display:none;position:fixed;inset:0;background:rgba(7,25,42,.52);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(105%);transition:.25s ease;overflow-y:auto;box-shadow:-15px 0 35px rgba(0,0,0,.15)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{height:72px;padding:0 18px;display:flex;align-items:center;gap:12px;border-bottom:1px solid var(--line);font-weight:800;color:var(--primary)}
    .drawer-head>a{margin-left:auto;padding:6px 10px;background:var(--primary);color:#fff;border-radius:7px;font-size:13px}
    .drawer-close{border:0;background:transparent;color:#506274;font-size:28px;line-height:1;cursor:pointer}
    .drawer-menu{padding:12px 18px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 3px;border:0;border-bottom:1px solid #edf2f6;background:transparent;text-align:left;color:var(--ink);font:inherit;font-size:15px;cursor:pointer}
    .drawer-toggle:after{content:"＋";float:right;color:var(--teal)}
    .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:8px 0;color:var(--muted);font-size:14px}

    .video-page{padding:64px 0 82px}
    .video-heading{text-align:center;max-width:760px;margin:0 auto 40px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--teal);font-size:13px;font-weight:800;letter-spacing:.08em}
    .eyebrow:before{content:"";width:28px;height:2px;background:var(--teal)}
    .video-heading h1{margin:14px 0 12px;color:var(--ink);font-size:clamp(30px,5vw,52px);line-height:1.15;letter-spacing:-.04em}
    .video-heading p{margin:0;color:var(--muted);font-size:16px}
    .video-filter{display:flex;justify-content:center;flex-wrap:wrap;gap:9px;margin:25px auto 0}
    .video-filter a{padding:7px 14px;border:1px solid #cddde8;border-radius:999px;background:#fff;color:#506274;font-size:13px}
    .video-filter a:hover,.video-filter a.active{border-color:var(--teal);background:#e5f8fb;color:#087a98}
    .video-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
    .video-card{overflow:hidden;background:var(--white);border:1px solid #e1ebf1;border-radius:var(--radius);box-shadow:0 8px 25px rgba(26,64,91,.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:linear-gradient(135deg,#0b3d91,#0891b2)}
    .video-cover img{width:100%;height:100%;object-fit:cover}
    .play-mark{position:absolute;left:18px;bottom:15px;width:39px;height:39px;display:grid;place-items:center;border-radius:50%;background:rgba(255,255,255,.92);color:var(--primary);font-size:17px;padding-left:2px}
    .duration{position:absolute;right:12px;bottom:11px;padding:3px 8px;border-radius:5px;background:rgba(10,24,39,.78);color:#fff;font-size:11px}
    .video-body{padding:18px}
    .video-meta{display:flex;align-items:center;justify-content:space-between;gap:8px;color:var(--muted);font-size:12px}
    .video-tag{color:var(--teal);font-weight:750}
    .video-body h2{margin:9px 0 7px;font-size:18px;line-height:1.4}
    .video-body p{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;min-height:4.8em;margin:0;color:var(--muted);font-size:14px}
    .video-link{display:inline-block;margin-top:15px;color:var(--primary);font-size:13px;font-weight:800}
    .pagination{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin-top:46px}
    .pagination a{min-width:38px;padding:7px 12px;border:1px solid #cfdee8;border-radius:8px;background:#fff;text-align:center;color:#506274;font-size:13px}
    .pagination a:hover,.pagination a.active{background:var(--primary);border-color:var(--primary);color:#fff}

    .footer{padding:55px 0 22px;background:#102a43;color:#dbe8f1}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:35px}
    .footer-brand strong{display:block;margin-bottom:12px;color:#fff;font-size:20px}
    .footer p{margin:8px 0;color:#adc4d3;font-size:13px}
    .footer h3{margin:0 0 14px;color:#fff;font-size:15px}
    .footer-grid>div:not(.footer-brand) a,.footer-grid>div:not(.footer-brand)>span{display:block;margin:7px 0;color:#adc4d3;font-size:13px}
    .footer a:hover{color:#7dd3fc}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:38px;padding-top:18px;border-top:1px solid rgba(255,255,255,.15);color:#91adbd;font-size:12px}

    @media(max-width:1050px){
      .main-nav{display:none}
      .header-btns .member-btn,.header-btns .open-btn{display:none}
      .hamburger{display:block}
      .video-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
    }
    @media(max-width:680px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{align-items:flex-start;flex-direction:column;gap:0;padding:8px 0}
      .topbar-links{gap:12px;flex-wrap:wrap}
      .header-inner{min-height:66px}
      .video-page{padding:42px 0 58px}
      .video-heading{margin-bottom:30px}
      .video-heading h1{font-size:34px}
      .video-grid{grid-template-columns:1fr;gap:16px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:25px 18px}
      .footer-brand{grid-column:1/-1}
      .footer-bottom{align-items:flex-start;flex-direction:column;gap:7px}
    }
    @media(max-width:430px){
      .footer-grid{grid-template-columns:1fr}
      .footer-brand{grid-column:auto}
    }