:root{--blue:#0B3D91;--ink:#17253d;--muted:#64748b;--line:#e4eaf2;--surface:#f5f7fb;--white:#fff}
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:var(--surface);font-family:system-ui,-apple-system,"PingFang HK","Microsoft JhengHei",sans-serif;line-height:1.65}
    a{color:inherit;text-decoration:none}
    a:hover{color:var(--blue)}
    img{max-width:100%;height:auto}
    button{font:inherit;cursor:pointer}
    .container{width:min(1200px,calc(100% - 40px));margin-inline:auto}
    .topbar{background:#12284d;color:#dce7f9;font-size:12px}
    .topbar-inner,.topbar-contact,.header-inner,.header-btns,.nav-list{display:flex;align-items:center}
    .topbar-inner{min-height:36px;justify-content:space-between;gap:16px}
    .topbar-contact{gap:22px;flex-wrap:wrap}
    .topbar a:hover{color:#fff}
    .header{position:relative;z-index:30;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{min-height:76px;gap:26px}
    .logo{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;color:var(--blue);font-size:19px;font-weight:800}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{justify-content:center;gap:4px;margin:0;padding:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:block;padding:25px 10px;font-size:14px;font-weight:650;white-space:nowrap}
    .has-arrow:after{content:"⌄";margin-left:5px;font-size:12px}
    .header-btns{gap:10px;white-space:nowrap}
    .member-link{font-size:13px;font-weight:650}
    .open-account,.drawer-head>a{padding:8px 17px;border-radius:8px;background:var(--blue);color:#fff;font-size:13px;font-weight:700}
    .open-account:hover,.drawer-head>a:hover{background:#082f70;color:#fff}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:0;z-index:40;visibility:hidden;opacity:0;transform:translateY(6px);transition:opacity .18s,transform .18s,visibility .18s;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:0 18px 38px #132b5024}
    .nav-item:hover>.dropdown-panel,.nav-item:focus-within>.dropdown-panel,.nav-item:hover>.mega-menu,.nav-item:focus-within>.mega-menu{visibility:visible;opacity:1;transform:translateY(0)}
    .dropdown-panel{width:300px;padding:18px}
    .mega-menu{width:min(740px,calc(100vw - 32px));padding:23px}
    .nav-item:nth-last-child(-n+3) .mega-menu{left:auto;right:0}
    .mega-grid{display:grid;grid-template-columns:1fr 1fr;gap:25px}
    .mega-block{min-width:0}
    .mega-block h3,.panel-title{margin:0 0 12px;font-size:14px;color:var(--blue);font-weight:800}
    .mega-block p{font-size:13px;color:var(--muted)}
    .panel-list{display:grid;gap:3px}
    .panel-list a{padding:8px;border-radius:7px;font-size:13px}
    .panel-list a:hover,.broker-mini:hover,.video-mini:hover,.tool-mini:hover,.product-mini:hover{background:#f0f5fc}
    .mega-footer{display:inline-block;margin-top:14px;padding:8px 0;color:var(--blue);font-size:13px;font-weight:750}
    .broker-mini,.video-mini,.tool-mini,.product-mini{display:flex;gap:10px;align-items:center;padding:7px;border-radius:8px}
    .broker-mini img,.tool-mini img{width:34px;height:34px;object-fit:contain;border-radius:6px}
    .video-mini img,.product-mini img{width:54px;height:38px;object-fit:cover;border-radius:5px}
    .broker-mini span,.video-mini span,.tool-mini span,.product-mini span{min-width:0}
    .broker-mini strong,.video-mini strong,.tool-mini strong,.product-mini strong{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:12px}
    .broker-mini small,.video-mini small,.tool-mini small,.product-mini small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--muted);font-size:11px}
    .hamburger{display:none;width:38px;height:38px;align-items:center;justify-content:center;flex-direction:column;gap:5px;border:1px solid var(--line);border-radius:8px;background:#fff}
    .hamburger span{width:18px;height:2px;background:var(--blue);transition:transform .2s,opacity .2s}
    .hamburger.active span:first-child{transform:translateY(7px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:last-child{transform:translateY(-7px) rotate(-45deg)}
    .drawer-overlay{position:fixed;inset:0;z-index:49;background:#10233b99;opacity:0;visibility:hidden;transition:.25s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;inset:0 0 0 auto;z-index:50;width:min(370px,90vw);background:#fff;transform:translateX(105%);transition:transform .25s;overflow-y:auto;box-shadow:-15px 0 45px #132b5033}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:18px;border-bottom:1px solid var(--line)}
    .drawer-head span{min-width:0;font-size:13px}
    .drawer-close{border:0;background:transparent;font-size:29px;line-height:1}
    .drawer-menu{padding:12px 18px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 7px;border:0;border-bottom:1px solid var(--line);background:none;text-align:left;font-size:14px;font-weight:700;color:var(--ink)}
    .drawer-toggle:after{content:"＋";float:right;color:var(--blue)}
    .drawer-toggle.active:after{content:"－"}
    .drawer-submenu{display:none;padding:7px 0 10px 13px;background:#f7f9fc}
    .drawer-submenu.open{display:grid}
    .drawer-submenu a{padding:8px 5px;font-size:13px;color:#42546d}
    .footer{margin-top:72px;background:#12284d;color:#e4ecfa}
    .footer-main{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.1fr;gap:38px;padding-block:55px 46px}
    .footer h3{margin:0 0 17px;color:#fff;font-size:16px}
    .footer p{margin:0 0 10px;font-size:13px;color:#bdcce2}
    .footer-links{display:grid;gap:9px}
    .footer-links a,.footer-contact a{font-size:13px;color:#bdcce2}
    .footer a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:15px;padding-block:17px;border-top:1px solid #ffffff24;color:#bdcce2;font-size:12px}
    .video-detail-main{padding-top:32px}
    .video-detail-main .breadcrumbs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:21px;color:var(--muted);font-size:13px}
    .video-detail-main .breadcrumbs a{color:var(--blue)}
    .video-detail-main .detail-heading{margin-bottom:25px}
    .video-detail-main .eyebrow{display:inline-flex;align-items:center;gap:8px;margin-bottom:10px;color:var(--blue);font-size:12px;font-weight:800;letter-spacing:.09em}
    .video-detail-main .eyebrow:before{content:"";width:7px;height:7px;border-radius:50%;background:#397bdb}
    .video-detail-main h1{margin:0 0 13px;font-size:clamp(27px,4vw,42px);line-height:1.24;overflow-wrap:anywhere}
    .video-detail-main .meta{display:flex;flex-wrap:wrap;gap:8px 18px;color:var(--muted);font-size:13px}
    .video-detail-main .detail-grid{display:grid;grid-template-columns:minmax(0,1fr) 290px;align-items:start;gap:24px}
    .video-detail-main .primary-column{min-width:0}
    .video-detail-main .player-shell{overflow:hidden;border-radius:17px;background:#101b2c;box-shadow:0 15px 36px #12284d22}
    .video-detail-main .player-frame{aspect-ratio:16/9;min-width:0;color:#fff}
    .video-detail-main .player-frame iframe,.video-detail-main .player-frame video,.video-detail-main .player-frame embed{display:block;width:100%;height:100%;border:0}
    .video-detail-main .player-frame img{max-width:100%}
    .video-detail-main .player-caption{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;padding:11px 17px;color:#cbd8ea;font-size:12px}
    .video-detail-main .content-card,.video-detail-main .side-card{margin-top:20px;padding:25px;border:1px solid var(--line);border-radius:15px;background:#fff}
    .video-detail-main .content-card h2,.video-detail-main .side-card h2{margin:0 0 14px;font-size:19px}
    .video-detail-main .content-card p{margin:0 0 15px;color:#46566e}
    .video-detail-main .rich-content{min-width:0;max-width:100%;overflow-x:auto;overflow-wrap:anywhere}
    .video-detail-main .rich-content img,.video-detail-main .rich-content table,.video-detail-main .rich-content iframe{max-width:100%}
    .video-detail-main .rich-content iframe{aspect-ratio:16/9}
    .video-detail-main .tags{padding-top:14px;border-top:1px solid var(--line);color:var(--muted);font-size:13px;overflow-wrap:anywhere}
    .video-detail-main .side-card{margin-top:0}
    .video-detail-main .related-video{display:flex;gap:11px;padding:12px 0;border-top:1px solid var(--line)}
    .video-detail-main .related-video img{width:92px;height:62px;flex-shrink:0;object-fit:cover;border-radius:8px;background:#edf1f7}
    .video-detail-main .related-video strong{display:-webkit-box;overflow:hidden;-webkit-box-orient:vertical;-webkit-line-clamp:2;font-size:13px;line-height:1.4}
    .video-detail-main .related-video small{display:block;margin-top:4px;color:var(--muted);font-size:11px}
    .video-detail-main .category-links{display:grid;gap:7px}
    .video-detail-main .category-links a{padding:9px 11px;border-radius:8px;background:#f2f6fc;color:var(--blue);font-size:13px;font-weight:700}
    .video-detail-main .notice{font-size:12px;color:var(--muted)}
    @media(max-width:1050px){
      .main-nav{display:none}
      .hamburger{display:flex}
      .header-inner{justify-content:space-between}
      .footer-main{grid-template-columns:repeat(2,minmax(0,1fr))}
    }
    @media(max-width:760px){
      .container{width:min(100% - 28px,1200px)}
      .topbar-inner{align-items:flex-start;flex-direction:column;gap:2px;padding-block:7px}
      .topbar-contact{gap:4px 15px}
      .header-inner{min-height:65px}
      .logo{font-size:16px}
      .logo img{width:32px;height:32px}
      .member-link{display:none}
      .video-detail-main .detail-grid{grid-template-columns:1fr}
      .video-detail-main .content-card,.video-detail-main .side-card{padding:19px}
      .video-detail-main .side-card{margin-top:0}
      .footer-main{gap:27px;padding-block:39px}
    }
    @media(max-width:480px){
      .footer-main{grid-template-columns:1fr 1fr}
      .footer-brand,.footer-contact{grid-column:1/-1}
      .footer-bottom{flex-direction:column}
    }