:root{
      --primary:#0B3D91;
      --primary-dark:#082d6b;
      --ink:#172238;
      --muted:#65728a;
      --line:#dfe6f0;
      --soft:#f4f7fb;
      --white:#fff;
      --shadow:0 18px 45px rgba(25,54,99,.12);
      --radius:16px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#fff;font-family:"PingFang SC","Microsoft YaHei",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{background:#f5f7fb;border-bottom:1px solid var(--line);font-size:13px;color:#65728a}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between}
    .topbar-links{display:flex;gap:22px}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:76px;display:flex;align-items:center;gap:32px}
    .logo{display:inline-flex;align-items:center;gap:10px;font-size:20px;font-weight:800;color:var(--primary);white-space:nowrap}
    .logo img{width:34px;height:34px;object-fit:contain}
    .main-nav{margin-left:auto}
    .nav-list{display:flex;align-items:stretch;gap:4px;list-style:none;margin:0;padding:0}
    .nav-item{position:relative}
    .nav-link{height:76px;padding:0 14px;display:flex;align-items:center;gap:7px;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-item:focus-within>.nav-link{color:var(--primary)}
    .arrow{width:7px;height:7px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg) translateY(-2px)}
    .header-btns{display:flex;align-items:center;gap:10px}
    .member-entry{color:var(--primary);font-size:14px;font-weight:700}
    .open-account{background:var(--primary);color:#fff;border-radius:8px;padding:9px 16px;font-size:14px;font-weight:700}
    .hamburger{display:none;border:0;background:none;width:42px;height:42px;padding:9px;cursor:pointer}
    .hamburger span{display:block;height:2px;margin:5px 0;background:var(--ink);transition:.2s}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% - 1px);left:50%;transform:translateX(-50%) translateY(8px);width:290px;padding:18px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:var(--shadow);opacity:0;visibility:hidden;pointer-events:none;transition:.2s;z-index:30}
    .mega-menu{width:min(850px,calc(100vw - 40px))}
    .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,.mega-list a{display:block;padding:7px 8px;color:#46536a;font-size:14px;border-radius:7px}
    .dropdown-panel a:hover,.mega-list a:hover{background:var(--soft);color:var(--primary)}
    .mega-grid{display:grid;grid-template-columns:1.15fr 1fr 1fr;gap:24px}
    .mega-title{margin:0 0 10px;padding-bottom:8px;border-bottom:1px solid var(--line);font-size:13px;color:var(--primary);font-weight:800}
    .mega-broker,.mega-video{display:flex;align-items:center;gap:9px;padding:7px;border-radius:8px}
    .mega-broker:hover,.mega-video:hover{background:var(--soft)}
    .mega-broker img,.mega-video img{width:32px;height:32px;border-radius:7px;object-fit:cover;background:#eef2f8}
    .mega-broker strong,.mega-video strong{display:block;font-size:13px}
    .mega-broker small,.mega-video small{display:block;color:var(--muted);font-size:11px}
    .mega-footer{display:block;margin:14px -18px -18px;padding:11px 18px;border-top:1px solid var(--line);color:var(--primary);font-size:13px;font-weight:700}
    .drawer-overlay{display:none}
    .mobile-drawer{position:fixed;top:0;right:-360px;width:min(360px,88vw);height:100vh;background:#fff;z-index:100;overflow:auto;transition:right .25s;box-shadow:-10px 0 30px rgba(0,0,0,.16)}
    .mobile-drawer.open{right:0}
    .drawer-overlay.open{display:block;position:fixed;inset:0;background:rgba(9,22,45,.45);z-index:90}
    .drawer-head{height:70px;padding:0 20px;display:flex;align-items:center;gap:16px;border-bottom:1px solid var(--line);font-weight:800;color:var(--primary)}
    .drawer-head a{margin-left:auto;background:var(--primary);color:#fff;border-radius:7px;padding:6px 12px;font-size:13px}
    .drawer-close{border:0;background:none;font-size:28px;cursor:pointer;color:var(--muted)}
    .drawer-menu{padding:12px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;text-align:left;border:0;border-bottom:1px solid var(--line);background:none;font-weight:700;color:var(--ink);cursor:pointer}
    .drawer-group .drawer-toggle:after{content:"+";float:right;color:var(--primary);font-size:20px}
    .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:14px}
    .footer{margin-top:80px;background:#101c31;color:#c8d2e2}
    .footer-main{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;padding:52px 0}
    .footer .logo{color:#fff}
    .footer-brand p{max-width:300px;color:#9eabc0;font-size:14px}
    .footer h3{margin:0 0 15px;color:#fff;font-size:15px}
    .footer-links,.footer-contact{display:flex;flex-direction:column;gap:8px;font-size:13px}
    .footer-links a:hover,.footer-contact a:hover{color:#fff}
    .footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:17px 0;color:#8997ad;font-size:12px}
    .video-detail-main{background:linear-gradient(180deg,#f7f9fc 0,#fff 460px);padding:52px 0 0}
    .crumbs{font-size:13px;color:var(--muted);margin-bottom:22px}
    .crumbs a{color:var(--primary)}
    .video-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:30px;align-items:start}
    .video-article{min-width:0}
    .video-heading{background:#fff;border:1px solid var(--line);border-radius:var(--radius) var(--radius) 0 0;padding:28px 32px 20px}
    .video-heading h1{font-size:clamp(25px,3vw,38px);line-height:1.3;margin:0 0 14px;color:#132b56}
    .video-meta{display:flex;flex-wrap:wrap;gap:18px;color:var(--muted);font-size:13px}
    .video-player{background:#0d1728;aspect-ratio:16/9;min-height:300px;display:flex;align-items:center;justify-content:center;overflow:hidden}
    .video-player video,.video-player iframe{width:100%;height:100%;border:0}
    .video-placeholder{width:100%;height:100%;min-height:300px;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#fff;background:radial-gradient(circle at 50% 35%,#315d9c,#0d1728 63%)}
    .play-mark{width:72px;height:72px;margin-bottom:14px;border:2px solid rgba(255,255,255,.8);border-radius:50%;display:grid;place-items:center;font-size:28px;padding-left:5px}
    .video-caption{font-size:13px;color:#c8d5e8}
    .video-body{background:#fff;border:1px solid var(--line);border-top:0;border-radius:0 0 var(--radius) var(--radius);padding:30px 32px}
    .video-intro{margin:0 0 25px;padding:16px 18px;background:#f4f7fb;border-left:4px solid var(--primary);color:#53627a}
    .video-content{min-width:0;max-width:100%;overflow-x:auto;color:#35445c}
    .video-content img,.video-content table{max-width:100%}
    .video-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:28px;padding-top:20px;border-top:1px solid var(--line)}
    .video-tags a{padding:5px 11px;background:#eef3fb;color:var(--primary);border-radius:20px;font-size:12px}
    .video-side{position:sticky;top:20px}
    .side-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px}
    .side-card h2{margin:0 0 15px;font-size:18px;color:#17335f}
    .related-video{display:grid;grid-template-columns:100px 1fr;gap:11px;padding:12px 0;border-bottom:1px solid var(--line)}
    .related-video:last-child{border-bottom:0}
    .related-video img{width:100px;height:66px;border-radius:8px;object-fit:cover;background:#e8edf5}
    .related-video strong{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;font-size:13px;line-height:1.45}
    .related-video small{display:block;color:var(--muted);font-size:11px;margin-top:5px}
    .video-actions{display:flex;gap:12px;margin-top:24px}
    .video-actions a{display:inline-flex;justify-content:center;align-items:center;padding:10px 18px;border-radius:8px;background:var(--primary);color:#fff;font-size:14px;font-weight:700}
    .video-actions a.secondary{background:#edf2f9;color:var(--primary)}
    @media(max-width:1000px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-btns{margin-left:auto}
      .video-layout{grid-template-columns:1fr}
      .video-side{position:static}
      .side-card{display:block}
      .footer-main{grid-template-columns:1fr 1fr}
    }
    @media(max-width:600px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{align-items:flex-start;flex-direction:column;padding:7px 0;gap:2px}
      .topbar-links{gap:12px;flex-wrap:wrap}
      .header-inner{height:66px;gap:10px}
      .nav-link{height:66px}
      .member-entry{display:none}
      .open-account{padding:8px 11px;font-size:13px}
      .video-detail-main{padding-top:30px}
      .video-heading,.video-body{padding:21px 18px}
      .video-heading h1{font-size:25px}
      .video-player{min-height:210px}
      .video-placeholder{min-height:210px}
      .footer-main{grid-template-columns:1fr;padding:38px 0;gap:28px}
    }