:root{
      --theme:#0B3D91;
      --ink:#172033;
      --muted:#667085;
      --line:#e5e9f0;
      --surface:#f5f7fa;
      --white:#fff;
      --shadow:0 18px 50px rgba(18,36,68,.09);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#fff;font-family:"Microsoft YaHei","PingFang SC",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:#f4f6f9;color:#687386;font-size:13px}
    .topbar .container{height:38px;display:flex;align-items:center;justify-content:space-between}
    .topbar-links{display:flex;gap:24px}
    .topbar a:hover{color:var(--theme)}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:78px;display:flex;align-items:center;gap:34px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;font-weight:800;font-size:19px;color:var(--theme)}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;justify-content:center;align-items:stretch;gap:3px;padding:0;margin:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:6px;padding:26px 15px;font-size:14px;white-space:nowrap}
    .nav-link:hover,.nav-item:focus-within>.nav-link{color:var(--theme)}
    .has-arrow:after{content:"⌄";font-size:14px;color:#8993a4}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% - 1px);left:50%;transform:translateX(-50%);width:280px;padding:18px;background:#fff;border:1px solid var(--line);border-radius:0 0 12px 12px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s;z-index:30}
    .mega-menu{width:620px}
    .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 a{display:block;padding:8px 10px;border-bottom:1px solid #f0f2f5;font-size:13px}
    .dropdown-panel a:last-child{color:var(--theme);border:0;margin-top:5px}
    .mega-title{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px;font-size:13px;font-weight:700;color:var(--theme)}
    .mega-title a{font-weight:400;color:var(--muted)}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}
    .mega-card{display:block;min-height:84px;padding:11px;border:1px solid var(--line);border-radius:9px;transition:.2s}
    .mega-card:hover{border-color:var(--theme);transform:translateY(-2px)}
    .mega-card strong{display:block;font-size:13px;margin-bottom:4px}
    .mega-card small{display:block;color:var(--muted);font-size:11px;line-height:1.5}
    .mega-card img{width:25px;height:25px;object-fit:contain;margin-bottom:5px}
    .mega-footer{display:block;margin-top:14px;padding-top:12px;border-top:1px solid var(--line);color:var(--theme);font-size:13px}
    .header-btns{display:flex;align-items:center;gap:12px;white-space:nowrap}
    .member-link{font-size:13px;color:var(--theme)}
    .open-account{padding:8px 15px;border-radius:6px;background:var(--theme);color:#fff;font-size:13px}
    .hamburger{display:none;width:40px;height:40px;border:1px solid var(--line);background:#fff;border-radius:6px;padding:9px;cursor:pointer}
    .hamburger span{display:block;height:2px;background:var(--theme);margin:4px 0;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(9,20,40,.42);opacity:0;visibility:hidden;transition:.25s;z-index:40}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:-370px;width:min(370px,88vw);height:100vh;background:#fff;z-index:50;transition:right .28s;overflow:auto;box-shadow:-12px 0 30px rgba(0,0,0,.12)}
    .mobile-drawer.open{right:0}
    .drawer-head{display:flex;align-items:center;gap:14px;padding:20px;border-bottom:1px solid var(--line)}
    .drawer-head strong{flex:1;color:var(--theme)}
    .drawer-head a{padding:6px 12px;background:var(--theme);color:#fff;border-radius:5px;font-size:13px}
    .drawer-close{border:0;background:none;font-size:27px;line-height:1;cursor:pointer;color:#5c6675}
    .drawer-menu{padding:12px 20px 30px}
    .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-size:15px;color:var(--ink);cursor:pointer}
    .drawer-toggle:after{content:"＋";float:right;color:#8792a3}
    .drawer-toggle.active{color:var(--theme)}
    .drawer-toggle.active:after{content:"－"}
    .drawer-submenu{display:none;padding:4px 0 8px 16px;background:#fafbfd}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:#647084;font-size:13px}
    .footer{margin-top:80px;background:#111b2d;color:#c5ccda}
    .footer .container{padding:54px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.1fr;gap:38px}
    .footer-brand{font-size:20px;font-weight:800;color:#fff;margin-bottom:13px}
    .footer p{margin:7px 0;color:#98a4b8;font-size:13px}
    .footer h3{margin:0 0 14px;color:#fff;font-size:15px}
    .footer-grid>div>a{display:block;margin:7px 0;color:#aeb9c9;font-size:13px}
    .footer-grid>div>a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:40px;padding-top:18px;border-top:1px solid rgba(255,255,255,.12);font-size:12px;color:#8390a5}
    .video-detail-main{padding:54px 0 0;background:linear-gradient(180deg,#f6f8fb 0,#fff 450px)}
    .video-breadcrumb{display:flex;gap:8px;align-items:center;color:#7a8699;font-size:13px;margin-bottom:25px}
    .video-breadcrumb a:hover{color:var(--theme)}
    .video-detail-main h1{max-width:900px;margin:0 auto 15px;text-align:center;font-size:clamp(27px,4vw,44px);line-height:1.25;color:#172033}
    .video-meta{display:flex;justify-content:center;flex-wrap:wrap;gap:18px;color:#768196;font-size:13px;margin-bottom:34px}
    .video-stage{position:relative;max-width:1000px;margin:0 auto;background:#101827;border-radius:16px;overflow:hidden;box-shadow:0 22px 55px rgba(15,31,58,.2)}
    .video-stage:before{content:"";display:block;padding-top:56.25%}
    .video-stage .player{position:absolute;inset:0}
    .video-stage video,.video-stage iframe{width:100%;height:100%;border:0}
    .video-placeholder{height:100%;display:flex;align-items:center;justify-content:center;flex-direction:column;color:#fff;background:radial-gradient(circle at 50% 35%,#23477f,#101827 62%)}
    .play-button{width:78px;height:78px;border:2px solid rgba(255,255,255,.82);border-radius:50%;display:grid;place-items:center;margin-bottom:15px;font-size:27px;padding-left:5px}
    .video-placeholder span{font-size:13px;color:#c4cfdf}
    .video-content-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:35px;max-width:1000px;margin:38px auto 0}
    .video-copy,.related-video-box{background:#fff;border:1px solid var(--line);border-radius:12px;padding:26px}
    .video-copy h2,.related-video-box h2{margin:0 0 15px;font-size:20px;color:#172033}
    .video-copy p{margin:0;color:#5e6b7f;font-size:15px;white-space:pre-line}
    .video-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}
    .video-tags a{padding:5px 11px;border-radius:30px;background:#edf3fb;color:var(--theme);font-size:12px}
    .related-video-box h2{font-size:17px}
    .related-video{display:block;padding:13px 0;border-bottom:1px solid var(--line)}
    .related-video:last-child{border-bottom:0}
    .related-video strong{display:block;font-size:13px;line-height:1.5}
    .related-video small{display:block;margin-top:4px;color:#8792a2;font-size:11px}
    .video-more{text-align:center;margin-top:28px}
    .video-more a{display:inline-block;padding:10px 22px;border:1px solid var(--theme);border-radius:6px;color:var(--theme);font-size:13px}
    @media(max-width:1050px){
      .header-inner{gap:15px}.logo{min-width:150px}.nav-link{padding-left:9px;padding-right:9px}.mega-menu{width:560px}
    }
    @media(max-width:820px){
      .container{width:min(100% - 30px,680px)}
      .topbar .container{height:auto;min-height:38px;padding-top:7px;padding-bottom:7px}
      .topbar-links{gap:10px}.main-nav{display:none}.header-inner{height:68px}
      .header-btns{margin-left:auto}.member-link,.open-account{display:none}.hamburger{display:block}
      .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
      .video-detail-main{padding-top:35px}.video-content-grid{grid-template-columns:1fr;gap:20px}
    }
    @media(max-width:520px){
      .topbar .container{display:block;font-size:11px}.topbar-links{margin-top:3px}
      .logo{font-size:16px;min-width:0}.logo img{width:32px;height:32px}
      .footer-grid{grid-template-columns:1fr}.footer-bottom{display:block}.footer-bottom span{display:block;margin-top:6px}
      .video-stage{border-radius:9px}.video-copy,.related-video-box{padding:20px}
      .video-meta{gap:8px 14px}.video-breadcrumb{font-size:12px}
    }