:root{--theme:#0B3D91;--ink:#172033;--muted:#697386;--line:#e4e8ef;--soft:#f4f6fa;--white:#fff;--shadow:0 18px 48px rgba(20,35,65,.1)}
    *{box-sizing:border-box}
    body{margin:0;color:var(--ink);background:#f7f8fb;font-family:Inter,"Noto Sans TC","PingFang HK","Microsoft JhengHei",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:#111827;color:#dbe3ef;font-size:13px}
    .topbar-inner{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-contact{display:flex;gap:20px}
    .topbar a:hover{color:#fff}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:78px;display:flex;align-items:center;gap:30px}
    .logo{display:flex;align-items:center;gap:10px;min-width:max-content;font-weight:800;font-size:19px;color:#111827}
    .logo img{width:34px;height:34px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;justify-content:center;align-items:stretch;gap:4px;list-style:none;padding:0;margin:0}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;height:78px;padding:0 14px;font-size:14px;font-weight:650;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%);width:300px;padding:18px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s;z-index:30}
    .mega-menu{width:530px}
    .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}
    .dropdown-list,.mega-links{display:grid;gap:3px}
    .dropdown-list a,.mega-links a{padding:9px 10px;border-radius:6px;font-size:14px}
    .dropdown-list a:hover,.mega-links a:hover{background:var(--soft);color:var(--theme)}
    .mega-heading{margin:0 0 12px;font-size:13px;color:var(--muted);font-weight:750}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
    .mega-card{display:flex;align-items:center;gap:9px;min-width:0;padding:9px;border:1px solid var(--line);border-radius:7px;background:#fff}
    .mega-card:hover{border-color:#9db6df;background:#f8fbff}
    .mega-card img{width:32px;height:32px;object-fit:cover;border-radius:5px;flex:0 0 auto}
    .mega-card>span{display:grid;min-width:0;gap:2px}
    .mega-card strong,.mega-card>span>span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .mega-card strong{font-size:12px}
    .mega-card>span>span{font-size:11px;color:var(--muted)}
    .mega-footer{display:block;margin-top:14px;padding-top:12px;border-top:1px solid var(--line);font-size:13px;color:var(--theme);font-weight:700}
    .header-btns{display:flex;align-items:center;gap:10px;min-width:max-content}
    .member-btn{font-size:13px;color:var(--theme);font-weight:700}
    .open-btn{padding:9px 16px;background:var(--theme);color:#fff;border-radius:5px;font-size:13px;font-weight:700}
    .hamburger{display:none;width:42px;height:42px;border:1px solid var(--line);background:#fff;border-radius:5px;cursor:pointer}
    .hamburger span{display:block;width:18px;height:2px;margin:4px auto;background:var(--ink);transition:.2s}
    .hamburger.active span:nth-child(1){transform:translateY(6px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
    .drawer-overlay{position:fixed;inset:0;background:rgba(7,14,28,.45);opacity:0;visibility:hidden;transition:.2s;z-index:40}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:-360px;width:min(360px,88vw);height:100vh;background:#fff;z-index:41;overflow:auto;transition:.25s;box-shadow:-12px 0 35px rgba(0,0,0,.16)}
    .mobile-drawer.open{right:0}
    .drawer-head{display:flex;align-items:center;gap:12px;padding:20px;border-bottom:1px solid var(--line);font-weight:750}
    .drawer-head span{flex:1}
    .drawer-head a{padding:7px 12px;background:var(--theme);color:#fff;border-radius:4px;font-size:13px}
    .drawer-close{border:0;background:transparent;font-size:25px;line-height:1;cursor:pointer;color:var(--muted)}
    .drawer-menu{padding:10px 20px 28px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid var(--line);background:none;text-align:left;font-weight:650;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--muted);font-size:18px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:5px 0 8px 14px}
    .drawer-submenu.open{display:grid}
    .drawer-submenu a{padding:8px 0;color:var(--muted);font-size:14px}
    .footer{margin-top:80px;background:#111827;color:#c6cfdd;padding:54px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px}
    .footer h3{margin:0 0 14px;color:#fff;font-size:15px}
    .footer a,.footer span{display:block;margin:7px 0;font-size:13px}
    .footer a:hover{color:#fff}
    .footer-brand strong{display:block;color:#fff;font-size:21px;margin-bottom:12px}
    .footer p{margin:8px 0;font-size:13px;line-height:1.8}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:42px;padding-top:18px;border-top:1px solid #2e3a4d;color:#8e9bad;font-size:12px}
    .video-detail-main{padding:58px 0 20px}
    .video-breadcrumb{display:flex;gap:8px;align-items:center;color:var(--muted);font-size:13px;margin-bottom:25px}
    .video-breadcrumb a:hover{color:var(--theme)}
    .video-heading{max-width:850px;margin:0 auto 30px;text-align:center}
    .video-heading h1{margin:0 0 14px;font-size:clamp(28px,4vw,46px);line-height:1.2;letter-spacing:0}
    .video-meta{display:flex;justify-content:center;flex-wrap:wrap;gap:10px 22px;color:var(--muted);font-size:13px}
    .video-stage{max-width:980px;margin:auto;background:#0c1220;border-radius:10px;overflow:hidden;box-shadow:var(--shadow)}
    .video-stage-frame{aspect-ratio:16/9;display:grid;place-items:center;background:radial-gradient(circle at 50% 30%,#243f72,#0c1220 65%);position:relative}
    .video-stage-frame:before{content:"";position:absolute;inset:18px;border:1px solid rgba(255,255,255,.15);border-radius:5px}
    .video-play{position:relative;z-index:1;width:72px;height:72px;border-radius:50%;display:grid;place-items:center;background:#fff;color:var(--theme);font-size:30px;padding-left:5px}
    .video-cover{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.48}
    .video-player-token{position:absolute;inset:auto 18px 16px;color:#fff;font-size:12px;text-align:center;opacity:.75}
    .video-info{max-width:980px;margin:30px auto 0;display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:30px}
    .video-panel{background:#fff;border:1px solid var(--line);border-radius:8px;padding:26px}
    .video-panel h2{margin:0 0 16px;font-size:20px}
    .video-panel p{margin:0;color:#4b5565;white-space:pre-line}
    .video-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}
    .video-tag{padding:5px 10px;background:#edf3fc;color:var(--theme);border-radius:4px;font-size:12px}
    .related-videos{display:grid;gap:13px}
    .related-videos h2{margin:0 0 3px;font-size:18px}
    .related-card{display:grid;grid-template-columns:92px 1fr;gap:11px;padding-bottom:13px;border-bottom:1px solid var(--line)}
    .related-card img{width:92px;height:62px;object-fit:cover;border-radius:5px;background:#dce5f3}
    .related-card strong{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;font-size:13px;line-height:1.45}
    .related-card small{display:block;margin-top:4px;color:var(--muted);font-size:11px}
    .video-more{display:inline-flex;margin-top:12px;color:var(--theme);font-size:13px;font-weight:700}
    @media (max-width:980px){
      .main-nav{display:none}.hamburger{display:block}.header-inner{height:68px}.header-btns{margin-left:auto}.footer-grid{grid-template-columns:repeat(2,1fr)}
      .video-info{grid-template-columns:1fr}
    }
    @media (max-width:620px){
      .container{width:min(100% - 28px,1180px)}.topbar-inner{padding:8px 0;align-items:flex-start}.topbar-contact{display:grid;gap:0;text-align:right}.member-btn{display:none}
      .mega-menu{width:calc(100vw - 28px)}.footer-grid{grid-template-columns:1fr;gap:25px}.footer-bottom{display:grid;gap:8px}.video-detail-main{padding-top:34px}.video-heading h1{font-size:30px}.video-panel{padding:20px}
    }