:root{
  --theme:#0B3D91;
  --ink:#12233f;
  --muted:#687895;
  --line:#dbe4f0;
  --mist:#f3f7fc;
  --white:#fff;
  --shadow:0 16px 42px rgba(20,54,102,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);background:#f8fbff;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:#102a52;color:#dbe8fb;font-size:13px}
.topbar .container{height:36px;display:flex;align-items:center;justify-content:space-between}
.topbar a{color:#fff}
.contact{opacity:.94}

.header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
.header-inner{min-height:78px;display:flex;align-items:center;gap:28px}
.logo{display:flex;align-items:center;gap:10px;min-width:190px;color:var(--theme);font-weight:800;font-size:19px}
.logo img{width:38px;height:38px;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-list>li{position:relative}
.nav-link{display:block;padding:26px 13px;color:#273a58;font-size:15px;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 8px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg)}
.dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(8px);width:310px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:0 0 12px 12px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.22s ease;z-index:30}
.mega-menu{width:620px}
.nav-list>li:before{content:"";position:absolute;left:0;right:0;top:100%;height:12px}
.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;transform:translateX(-50%) translateY(0)}
.drop-title,.mega-title{margin:0 0 12px;color:var(--theme);font-size:14px;font-weight:800}
.drop-item{display:block;padding:8px 0;border-bottom:1px solid #edf1f7;font-size:14px}
.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:8px;padding:11px;border:1px solid #e6edf6;border-radius:9px;background:#fbfdff}
.mega-card img{grid-row:span 3;width:30px;height:30px;object-fit:contain}
.mega-card strong{font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.mega-card small{grid-column:2;color:var(--muted);font-size:11px;line-height:1.45}
.mega-footer{display:inline-block;margin-top:13px;margin-right:12px;color:var(--theme);font-size:13px;font-weight:700}
.header-btns{display:flex;align-items:center;gap:13px;white-space:nowrap}
.open-account{padding:8px 15px;border-radius:5px;background:var(--theme);color:#fff;font-size:13px}
.hamburger{display:none;width:40px;height:40px;padding:8px;border:1px solid var(--line);background:#fff;border-radius:6px;cursor:pointer}
.hamburger span{display:block;width:21px;height:2px;margin:5px auto;background:var(--theme);transition:.2s}
.hamburger.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.hamburger.active span:nth-child(2){opacity:0}
.hamburger.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.drawer-overlay{display:none;position:fixed;inset:0;background:rgba(8,25,55,.46);z-index:40}
.drawer-overlay.open{display:block}
.mobile-drawer{position:fixed;top:0;right:0;width:min(380px,88vw);height:100vh;overflow:auto;background:#fff;z-index:50;transform:translateX(100%);transition:transform .25s ease;box-shadow:-14px 0 40px rgba(6,31,69,.18)}
.mobile-drawer.open{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;gap:14px;padding:20px;border-bottom:1px solid var(--line);color:var(--theme);font-weight:700}
.drawer-head a{margin-left:auto;padding:5px 11px;background:var(--theme);color:#fff;border-radius:4px;font-size:13px}
.drawer-close{border:0;background:none;color:#456;font-size:28px;line-height:1;cursor:pointer}
.drawer-menu{padding:10px 20px 30px}
.drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;border-bottom:1px solid #edf1f7;color:#253b5b;text-align:left;font-size:15px;background:none;border-left:0;border-right:0;border-top:0;cursor:pointer}
.drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:18px}
.drawer-toggle.active:after{content:"−"}
.drawer-submenu{display:none;padding:4px 0 7px 14px}
.drawer-submenu.open{display:block}
.drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:14px}

.video-page{padding:58px 0 80px}
.video-heading{text-align:center;max-width:720px;margin:0 auto 36px}
.video-heading .eyebrow{display:inline-block;margin-bottom:10px;padding:4px 12px;border:1px solid #b9cce8;border-radius:30px;color:var(--theme);font-size:13px;background:#eef5ff}
.video-heading h1{margin:0;color:#112d59;font-size:clamp(30px,4vw,48px);line-height:1.25;letter-spacing:.02em}
.video-heading p{margin:14px 0 0;color:var(--muted);font-size:16px}
.video-categories{display:flex;justify-content:center;flex-wrap:wrap;gap:10px;margin:0 auto 34px}
.video-categories a{padding:8px 17px;border:1px solid #cad9ed;border-radius:24px;background:#fff;color:#3c5577;font-size:14px;transition:.2s}
.video-categories a:hover,.video-categories a.active{border-color:var(--theme);background:var(--theme);color:#fff}
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.video-card{overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:13px;box-shadow:0 8px 25px rgba(20,54,102,.06);transition:.2s}
.video-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.video-cover{position:relative;aspect-ratio:16/9;background:#dce8f7;overflow:hidden}
.video-cover img{width:100%;height:100%;object-fit:cover}
.video-duration{position:absolute;right:10px;bottom:10px;padding:2px 7px;border-radius:4px;background:rgba(8,27,60,.82);color:#fff;font-size:12px}
.video-card-body{padding:18px}
.video-card h2{margin:0 0 8px;color:#193a6e;font-size:18px;line-height:1.45}
.video-card p{display:-webkit-box;overflow:hidden;margin:0 0 13px;color:var(--muted);font-size:14px;line-height:1.7;-webkit-box-orient:vertical;-webkit-line-clamp:3}
.video-meta{display:flex;justify-content:space-between;gap:10px;color:#8a9ab1;font-size:12px}
.video-more{display:inline-block;margin-top:14px;color:var(--theme);font-size:13px;font-weight:700}
.pagination{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin-top:42px}
.pagination a{min-width:36px;padding:6px 11px;border:1px solid #cbd8e9;border-radius:5px;background:#fff;text-align:center;color:#506887;font-size:13px}
.pagination a:hover,.pagination a.current,.pagination a.active{background:var(--theme);border-color:var(--theme);color:#fff}

.footer{padding:48px 0 0;background:#102a52;color:#c9d8ed}
.footer-grid{display:grid;grid-template-columns:1.35fr 1fr 1fr 1fr;gap:35px}
.footer h3,.footer h4{margin:0 0 14px;color:#fff}
.footer h3{font-size:20px}
.footer h4{font-size:15px}
.footer p{margin:7px 0;color:#b3c6df;font-size:13px}
.footer-grid>div>a{display:block;margin:7px 0;color:#b3c6df;font-size:13px}
.footer-grid>div>a:hover{color:#fff}
.footer-bottom{margin-top:35px;padding:18px 0;border-top:1px solid rgba(255,255,255,.13);color:#9eb4d1;font-size:12px;text-align:center}

@media(max-width:1050px){
  .header-inner{gap:12px}
  .logo{min-width:160px}
  .nav-link{padding-left:8px;padding-right:8px;font-size:14px}
}
@media(max-width:820px){
  .container{width:min(100% - 28px,620px)}
  .topbar .container{height:auto;min-height:36px;padding:7px 0;align-items:flex-start;gap:5px;flex-direction:column}
  .contact{font-size:12px}
  .header-inner{min-height:68px}
  .main-nav{display:none}
  .header-btns{margin-left:auto}
  .hamburger{display:block}
  .video-page{padding:40px 0 60px}
  .video-grid{grid-template-columns:repeat(2,1fr);gap:16px}
  .footer-grid{grid-template-columns:repeat(2,1fr);gap:28px}
}
@media(max-width:540px){
  .logo{min-width:0;font-size:16px}
  .logo img{width:32px;height:32px}
  .header-btns>span{display:none}
  .video-heading h1{font-size:32px}
  .video-heading p{font-size:14px}
  .video-grid{grid-template-columns:1fr}
  .video-card-body{padding:15px}
  .footer-grid{grid-template-columns:1fr;gap:22px}
}