:root{
  --theme:#0B3D91;
  --ink:#14233b;
  --muted:#68758a;
  --line:#dce5f0;
  --soft:#f3f7fb;
  --white:#fff;
  --shadow:0 18px 50px rgba(16,45,86,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:#f7faff;color:var(--ink);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}
.container{width:min(1180px,calc(100% - 40px));margin:0 auto}
.topbar{background:#092e6e;color:#dceaff;font-size:13px}
.topbar .container{height:36px;display:flex;align-items:center;justify-content:space-between}
.topbar a{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;font-size:20px;font-weight:800;color:var(--theme);white-space:nowrap}
.logo img{width:34px;height:34px;object-fit:contain}
.main-nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:3px;list-style:none;margin:0;padding:0}
.nav-list>li{position:relative}
.nav-link{display:block;padding:26px 13px;font-size:14px;font-weight:700;white-space:nowrap}
.nav-link:hover,.nav-link:focus{color:var(--theme)}
.has-arrow:after{content:"";display:inline-block;width:6px;height:6px;margin:0 0 3px 7px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg)}
.dropdown-panel,.mega-menu{position:absolute;top:calc(100% - 1px);left:50%;transform:translate(-50%,8px);width:300px;padding:20px;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 ease}
.mega-menu{width:620px}
.nav-list>li:hover .dropdown-panel,.nav-list>li:focus-within .dropdown-panel,.nav-list>li:hover .mega-menu,.nav-list>li:focus-within .mega-menu{opacity:1;visibility:visible;pointer-events:auto;transform:translate(-50%,0)}
.dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
.drop-title,.mega-title{margin:0 0 12px;color:var(--theme);font-size:15px;font-weight:800}
.drop-item{display:block;padding:8px 0;border-bottom:1px solid #edf1f6;font-size:13px}
.drop-item:hover,.mega-card:hover{color:var(--theme)}
.mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.mega-card{display:grid;grid-template-columns:34px 1fr;column-gap:9px;padding:11px;border:1px solid #e5ebf3;border-radius:10px;background:#fbfdff}
.mega-card img{width:30px;height:30px;object-fit:contain;grid-row:span 3}
.mega-card strong{font-size:13px;line-height:1.4}
.mega-card small{display:block;color:var(--muted);font-size:11px;line-height:1.5}
.mega-footer{display:inline-block;margin-top:14px;color:var(--theme);font-size:12px;font-weight:700;margin-right:14px}
.header-btns{display:flex;align-items:center;gap:13px;white-space:nowrap}
.header-btns>span{font-size:13px;color:var(--theme);font-weight:700}
.open-account{padding:8px 15px;border-radius:6px;background:var(--theme);color:#fff;font-size:13px;font-weight:700}
.hamburger{display:none;border:0;background:transparent;padding:7px;cursor:pointer}
.hamburger span{display:block;width:23px;height:2px;margin:4px 0;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(5,20,45,.45);opacity:0;visibility:hidden;z-index:40;transition:.25s}
.drawer-overlay.open{opacity:1;visibility:visible}
.mobile-drawer{position:fixed;right:0;top:0;bottom:0;width:min(390px,88vw);background:#fff;z-index:41;transform:translateX(100%);transition:.3s ease;overflow:auto;box-shadow:-14px 0 40px rgba(0,0,0,.16)}
.mobile-drawer.open{transform:translateX(0)}
.drawer-head{height:70px;padding:0 20px;display:flex;align-items:center;gap:14px;border-bottom:1px solid var(--line);color:var(--theme);font-weight:800}
.drawer-head>a{margin-left:auto;background:var(--theme);color:#fff;padding:5px 11px;border-radius:5px;font-size:13px}
.drawer-close{border:0;background:none;font-size:29px;color:var(--muted);cursor:pointer}
.drawer-menu{padding:12px 20px 35px}
.drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;border:0;border-bottom:1px solid #edf1f6;background:none;text-align:left;font:inherit;color:var(--ink);font-size:15px;font-weight:700;cursor:pointer}
.drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:20px;font-weight:400}
.drawer-toggle.active:after{content:"−"}
.drawer-submenu{max-height:0;overflow:hidden;transition:max-height .25s ease;padding-left:14px}
.drawer-submenu.open{max-height:600px}
.drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:13px}
.footer{margin-top:70px;background:#102746;color:#dbe6f5}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:38px;padding:48px 0 35px}
.footer h3{margin:0 0 12px;color:#fff;font-size:20px}
.footer h4{margin:0 0 14px;color:#fff;font-size:14px}
.footer p{margin:7px 0;color:#aebed3;font-size:13px}
.footer-grid>div>a{display:block;margin:7px 0;color:#b9c8db;font-size:13px}
.footer-grid>div>a:hover{color:#fff}
.footer-bottom{padding:18px 0;border-top:1px solid rgba(255,255,255,.13);color:#9cafc6;font-size:12px;text-align:center}
.video-detail-main{padding:48px 0 10px}
.video-breadcrumb{display:flex;align-items:center;gap:9px;margin-bottom:20px;color:var(--muted);font-size:13px}
.video-breadcrumb a{color:var(--theme)}
.video-heading{max-width:900px;margin:0 auto 25px;text-align:center}
.video-heading h1{margin:0 0 12px;color:#102b54;font-size:clamp(28px,4vw,48px);line-height:1.25;letter-spacing:-1px}
.video-meta{display:flex;justify-content:center;flex-wrap:wrap;gap:9px 22px;color:var(--muted);font-size:13px}
.video-meta span{position:relative}
.video-meta span+span:before{content:"";position:absolute;left:-12px;top:9px;width:3px;height:3px;background:#9eacc0;border-radius:50%}
.video-stage{position:relative;max-width:1060px;min-height:360px;margin:30px auto 34px;padding:0;background:#07172e;border:10px solid #fff;border-radius:18px;box-shadow:var(--shadow);overflow:hidden}
.video-stage img{width:100%;height:100%;min-height:350px;object-fit:cover;opacity:.72}
.video-stage:after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(4,17,38,.75),rgba(4,17,38,.05) 65%)}
.video-player{position:absolute;inset:0;z-index:2;display:flex;align-items:center;justify-content:center;color:#fff}
.video-player>*{max-width:100%}
.video-play-label{position:absolute;left:28px;bottom:20px;color:#fff;font-size:14px;letter-spacing:.08em}
.video-content-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:30px;align-items:start}
.video-article-card,.related-video-panel{background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 8px 28px rgba(16,45,86,.05)}
.video-article-card{padding:30px}
.video-article-card h2,.related-video-panel h2{margin:0 0 18px;font-size:20px;color:#163b70}
.video-intro{padding:15px 18px;margin-bottom:22px;border-left:4px solid var(--theme);background:#f1f6fc;color:#52647a;font-size:15px}
.video-body{min-width:0;max-width:100%;overflow-x:auto;color:#35465c}
.video-body img,.video-body video{max-width:100%;height:auto}
.video-body table{max-width:100%;display:block;overflow-x: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 10px;color:var(--theme);background:#edf4fd;border-radius:20px;font-size:12px}
.related-video-panel{padding:22px}
.related-video{display:block;padding:13px 0;border-bottom:1px solid #edf1f6}
.related-video:last-child{border-bottom:0}
.related-video strong{display:block;margin-bottom:3px;font-size:14px;line-height:1.5}
.related-video small{color:var(--muted);font-size:12px}
.video-more{display:inline-block;margin-top:18px;padding:9px 16px;border:1px solid var(--theme);border-radius:6px;color:var(--theme);font-size:13px;font-weight:700}
@media(max-width:1050px){
  .main-nav{display:none}
  .header-btns{margin-left:auto}
  .hamburger{display:block}
}
@media(max-width:760px){
  .container{width:min(100% - 28px,1180px)}
  .topbar .container{height:auto;min-height:38px;gap:4px;align-items:flex-start;flex-direction:column;padding:6px 0}
  .header-inner{height:68px;gap:10px}
  .logo{font-size:17px}
  .header-btns>span{display:none}
  .open-account{padding:7px 10px}
  .video-detail-main{padding-top:28px}
  .video-heading h1{font-size:29px}
  .video-stage{min-height:230px;border-width:6px;border-radius:12px}
  .video-stage img{min-height:220px}
  .video-content-layout{grid-template-columns:1fr;gap:18px}
  .video-article-card{padding:21px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:25px;padding:35px 0 25px}
}
@media(max-width:460px){
  .footer-grid{grid-template-columns:1fr}
  .video-meta{justify-content:flex-start}
  .video-heading{text-align:left}
  .video-breadcrumb{font-size:12px}
}