:root{
      --primary:#0B3D91;
      --primary-dark:#08285f;
      --ink:#17243b;
      --muted:#6f7d91;
      --line:#e5eaf1;
      --soft:#f4f7fb;
      --white:#fff;
      --radius:16px;
      --shadow:0 14px 40px rgba(21,44,83,.1);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f7f9fc;font:14px/1.75 -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Arial,sans-serif}
    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:#071c43;color:#cbd8ee;font-size:12px}
    .topbar .container{height:34px;display:flex;align-items:center;justify-content:space-between}
    .topbar a{margin-left:20px;color:#dce8fa}
    .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:190px;color:var(--primary);font-weight:800;font-size:18px}
    .logo img{width:36px;height:36px;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:block;padding:27px 14px;color:#26344a;font-weight:600;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--primary)}
    .has-arrow:after{content:"⌄";font-size:12px;margin-left:6px;color:#8492a7}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% + 1px);left:50%;transform:translateX(-50%);width:270px;padding:16px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s;z-index:30}
    .mega-menu{width:720px;padding:22px}
    .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-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .dropdown-panel>a,.mega-grid>div:first-child>a{display:block;padding:7px 8px;border-radius:8px}
    .dropdown-panel>a:hover,.mega-grid>div:first-child>a:hover{background:var(--soft);color:var(--primary)}
    .mega-grid{display:grid;grid-template-columns:190px 1fr;gap:24px}
    .mega-grid h4{margin:0 0 6px;color:var(--primary);font-size:16px}
    .mega-grid p{margin:0 0 10px;color:var(--muted);font-size:13px}
    .mega-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:9px}
    .mega-card{display:block;min-height:58px;padding:10px;border:1px solid var(--line);border-radius:10px;background:#fbfcff}
    .mega-card:hover{border-color:#a9bee3;background:#f1f6ff}
    .mega-card b,.mega-card small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .mega-card b{font-size:13px}.mega-card small{margin-top:3px;color:var(--muted);font-size:11px}
    .mega-card img{width:22px;height:22px;object-fit:contain;margin-bottom:4px}
    .mega-footer{display:block;margin-top:16px;padding-top:12px;border-top:1px solid var(--line);color:var(--primary);font-weight:700}
    .header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}
    .member-btn{color:var(--primary);font-weight:700}
    .open-btn{padding:8px 16px;border-radius:20px;background:var(--primary);color:#fff;font-weight:700}
    .hamburger{display:none;width:40px;height:40px;border:1px solid var(--line);border-radius:9px;background:#fff;cursor:pointer}
    .hamburger span{display:block;width:19px;height:2px;margin:4px auto;background:var(--primary);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(4,18,45,.48);opacity:0;visibility:hidden;z-index:80;transition:.25s}
    .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:90;overflow:auto;transition:right .25s;box-shadow:-15px 0 40px rgba(0,0,0,.15)}
    .mobile-drawer.open{right:0}
    .drawer-head{height:68px;display:flex;align-items:center;gap:13px;padding:0 20px;border-bottom:1px solid var(--line);font-weight:700}
    .drawer-head>a{margin-left:auto;color:var(--primary)}
    .drawer-close{border:0;background:none;font-size:29px;color:#68758a;cursor:pointer}
    .drawer-menu{padding:12px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;border:0;border-bottom:1px solid #edf0f5;background:none;text-align:left;color:var(--ink);font-weight:600;cursor:pointer}
    .drawer-toggle:after{content:"＋";float:right;color:var(--primary)}
    .drawer-toggle.active:after{content:"－"}
    .drawer-submenu{display:none;padding:5px 0 8px 14px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:7px 0;color:var(--muted);font-size:13px}
    .footer{margin-top:70px;padding:48px 0 20px;background:#071b3d;color:#bdcbe0}
    .footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.3fr;gap:35px}
    .footer strong{display:block;margin-bottom:12px;color:#fff;font-size:19px}
    .footer h4{margin:0 0 13px;color:#fff;font-size:15px}
    .footer p{margin:5px 0;font-size:13px}
    .footer-grid>div:not(:first-child) a{display:block;margin:5px 0;color:#bdcbe0;font-size:13px}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:35px;padding-top:18px;border-top:1px solid rgba(255,255,255,.14);font-size:12px}
    .video-detail-main{padding:48px 0 10px}
    .video-breadcrumb{margin-bottom:18px;color:var(--muted);font-size:13px}
    .video-breadcrumb a{color:var(--primary)}
    .video-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:28px;align-items:start}
    .video-main-card,.video-side-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
    .video-main-card{overflow:hidden}
    .video-title{padding:26px 30px 18px}
    .video-title h1{margin:0 0 12px;color:#102753;font-size:clamp(25px,3vw,38px);line-height:1.3}
    .video-meta{display:flex;flex-wrap:wrap;gap:14px;color:var(--muted);font-size:13px}
    .video-stage{position:relative;min-height:420px;background:#071631;display:flex;align-items:center;justify-content:center;overflow:hidden}
    .video-stage:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 50% 35%,rgba(35,99,198,.4),transparent 48%),linear-gradient(135deg,#06132b,#102e63)}
    .video-cover{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.45}
    .video-player-wrap{position:relative;width:100%;height:100%;min-height:420px;display:flex;align-items:center;justify-content:center}
    .video-play{position:relative;width:76px;height:76px;border:1px solid rgba(255,255,255,.65);border-radius:50%;background:rgba(11,61,145,.85);color:#fff;font-size:28px;line-height:76px;text-align:center;padding-left:5px;box-shadow:0 0 0 12px rgba(255,255,255,.1)}
    .video-body{padding:28px 30px 32px;min-width:0;max-width:100%;overflow-x:auto}
    .video-body h2{margin:0 0 15px;color:#112c5e;font-size:20px}
    .video-content{max-width:100%;overflow-x:auto;color:#435269}
    .video-content img,.video-content table{max-width:100%;height:auto}
    .video-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:25px;padding-top:20px;border-top:1px solid var(--line)}
    .video-tags a{padding:4px 11px;border-radius:20px;background:#eef4fd;color:var(--primary);font-size:12px}
    .video-side-card{padding:22px}
    .video-side-card h2{margin:0 0 16px;font-size:18px;color:#102753}
    .side-video{display:grid;grid-template-columns:92px 1fr;gap:10px;padding:12px 0;border-top:1px solid var(--line)}
    .side-video:first-of-type{border-top:0;padding-top:0}
    .side-video img{width:92px;height:62px;border-radius:8px;object-fit:cover;background:#dbe5f5}
    .side-video strong{display:block;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;font-size:13px;line-height:1.5}
    .side-video small{display:block;margin-top:4px;color:var(--muted)}
    .more-video{display:block;margin-top:12px;padding:10px;border-radius:8px;background:#eef4fd;color:var(--primary);text-align:center;font-weight:700}
    @media(max-width:980px){
      .main-nav{display:none}.hamburger{display:block}.header-inner{justify-content:space-between}.header-btns{margin-left:auto}
      .video-layout{grid-template-columns:1fr}.video-side-card{display:grid;grid-template-columns:repeat(2,1fr);gap:0 14px}.video-side-card h2,.more-video{grid-column:1/-1}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media(max-width:620px){
      .container{width:min(100% - 28px,1180px)}.topbar .container{height:auto;padding:7px 0;display:block}.topbar a{margin:0 14px 0 0}
      .logo{min-width:0}.logo span{font-size:15px}.member-btn{display:none}.header-inner{height:66px;gap:10px}
      .video-detail-main{padding-top:28px}.video-title{padding:21px 18px 16px}.video-title h1{font-size:25px}
      .video-stage,.video-player-wrap{min-height:250px}.video-body{padding:22px 18px}.video-side-card{display:block}
      .side-video{margin-top:0}.footer-grid{grid-template-columns:1fr;gap:25px}.footer-bottom{display:block}.footer-bottom span{display:block;margin-top:5px}
    }