:root{
  --主题色:#0B3D91;
  --深色:#101116;
  --墨色:#17181d;
  --浅色:#f6f4ee;
  --纸色:#fffdf8;
  --线色:#dfe3eb;
  --灰色:#687285;
  --强调色:#d43b32;
  --容器:1240px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--浅色);color:var(--深色);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.6}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:min(calc(100% - 40px),var(--容器));margin:0 auto}
.topbar{background:var(--墨色);color:#d9dce4;font-size:13px}
.topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between}
.topbar .contact{display:flex;gap:22px}
.topbar a:hover{color:#fff}
.header{position:relative;z-index:20;background:var(--纸色);border-bottom:1px solid var(--线色)}
.header-inner{height:78px;display:flex;align-items:center;gap:28px}
.logo{display:flex;align-items:center;gap:10px;min-width:190px;font-weight:800;font-size:18px;letter-spacing:.02em}
.logo img{width:36px;height:36px;object-fit:contain}
.main-nav{flex:1}
.nav-list{display:flex;align-items:stretch;justify-content:center;gap:3px;list-style:none;margin:0;padding:0}
.nav-item{position:relative}
.nav-link{display:flex;align-items:center;height:78px;padding:0 14px;font-size:14px;white-space:nowrap}
.nav-link:hover,.nav-link:focus-visible{color:var(--主题色)}
.has-arrow:after{content:"";width:6px;height:6px;margin-left:8px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg) translateY(-2px)}
.dropdown-panel,.mega-menu{position:absolute;top:calc(100% + 1px);left:50%;width:330px;padding:14px;background:#fff;border:1px solid var(--线色);box-shadow:0 18px 45px rgba(15,25,45,.14);opacity:0;visibility:hidden;transform:translate(-50%,8px);transition:.2s ease;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;transform:translate(-50%,0)}
.dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;height:12px;top:-12px}
.dropdown-panel>a:not(.mega-footer){display:block;padding:11px 10px;border-bottom:1px solid #edf0f4}
.dropdown-panel strong,.mega-card strong{display:block;font-size:14px}
.dropdown-panel small,.mega-card small{display:block;color:var(--灰色);font-size:12px;line-height:1.5;margin-top:3px}
.mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}
.mega-grid+.mega-grid{margin-top:12px;padding-top:12px;border-top:1px solid var(--线色)}
.mega-grid>a:not(.mega-card){padding:8px 10px;background:#f4f6fa;color:var(--主题色);font-size:13px}
.mega-card{min-height:92px;padding:11px;background:#f7f8fa;border:1px solid #e8ebf0}
.mega-card img{width:26px;height:26px;object-fit:contain;margin-bottom:5px}
.mega-footer{display:block;margin-top:12px;padding:11px;text-align:center;background:var(--主题色);color:#fff;font-size:13px}
.header-btns{display:flex;align-items:center;gap:9px;white-space:nowrap}
.member-btn,.account-btn{padding:9px 13px;font-size:13px;border:1px solid var(--主题色)}
.member-btn{color:var(--主题色)}
.account-btn{background:var(--主题色);color:#fff}
.hamburger{display:none;width:42px;height:38px;padding:8px;border:1px solid var(--线色);background:#fff;cursor:pointer}
.hamburger span{display:block;height:2px;margin:5px 0;background:var(--深色);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{position:fixed;inset:0;background:rgba(7,12,23,.48);opacity:0;visibility:hidden;transition:.25s;z-index:50}
.drawer-overlay.open{opacity:1;visibility:visible}
.mobile-drawer{position:fixed;top:0;right:-390px;width:min(390px,88vw);height:100vh;background:#fff;z-index:51;overflow:auto;transition:right .28s ease;box-shadow:-12px 0 35px rgba(0,0,0,.18)}
.mobile-drawer.open{right:0}
.drawer-head{height:72px;display:flex;align-items:center;gap:14px;padding:0 20px;border-bottom:1px solid var(--线色)}
.drawer-head strong{flex:1;color:var(--主题色)}
.drawer-head>a{padding:6px 12px;background:var(--主题色);color:#fff;font-size:13px}
.drawer-close{border:0;background:transparent;font-size:29px;line-height:1;cursor:pointer}
.drawer-menu{padding:14px 20px 30px}
.drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;text-align:left;background:none;border:0;border-bottom:1px solid #edf0f4;font-size:15px;cursor:pointer}
.drawer-toggle:after{content:"+";float:right;color:var(--主题色);font-size:19px}
.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:700px}
.drawer-submenu a{display:block;padding:9px 0;color:var(--灰色);font-size:14px}
.footer{margin-top:80px;background:var(--墨色);color:#d8dce5;padding:54px 0 20px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px}
.footer-brand{color:#fff;font-size:22px;font-weight:800;margin-bottom:12px}
.footer p{margin:8px 0;color:#aeb5c2;font-size:13px}
.footer h3{margin:0 0 14px;color:#fff;font-size:15px}
.footer-grid>div>a{display:block;color:#aeb5c2;font-size:13px;margin:7px 0}
.footer-grid>div>a:hover{color:#fff}
.footer-bottom{margin-top:40px;padding-top:18px;border-top:1px solid #343943;color:#89919f;font-size:12px}
.video-page{padding:64px 0 30px}
.video-page .page-heading{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:30px}
.video-page .eyebrow{margin:0 0 8px;color:var(--主题色);font-size:12px;font-weight:700;letter-spacing:.18em}
.video-page h1{margin:0;font-size:clamp(32px,5vw,62px);line-height:1.08;letter-spacing:-.04em}
.video-page .intro{max-width:460px;margin:0;color:var(--灰色);font-size:15px}
.video-page .category-strip{display:flex;flex-wrap:wrap;gap:10px;padding:17px 0;border-top:1px solid var(--线色);border-bottom:1px solid var(--线色);margin-bottom:32px}
.video-page .category-strip a{padding:8px 16px;border:1px solid #cbd2df;background:#fff;color:var(--主题色);font-size:13px}
.video-page .category-strip a:hover{background:var(--主题色);color:#fff;border-color:var(--主题色)}
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.video-card{background:#fff;border:1px solid var(--线色);transition:transform .2s,box-shadow .2s}
.video-card:hover{transform:translateY(-4px);box-shadow:0 14px 30px rgba(20,38,75,.1)}
.video-cover{position:relative;aspect-ratio:16/9;background:#dfe5ee;overflow:hidden}
.video-cover img{width:100%;height:100%;object-fit:cover}
.video-duration{position:absolute;right:10px;bottom:10px;padding:3px 7px;background:rgba(0,0,0,.75);color:#fff;font-size:11px}
.video-body{padding:18px}
.video-body h2{margin:0 0 8px;font-size:18px;line-height:1.4}
.video-body p{display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;overflow:hidden;margin:0 0 14px;color:var(--灰色);font-size:13px;line-height:1.7}
.video-meta{display:flex;justify-content:space-between;gap:10px;color:#8993a4;font-size:12px}
.video-more{display:inline-block;margin-top:14px;color:var(--主题色);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:7px 11px;text-align:center;border:1px solid var(--线色);background:#fff;font-size:13px}
.pagination a.active,.pagination a:hover{background:var(--主题色);border-color:var(--主题色);color:#fff}
@media(max-width:1080px){
  .main-nav{display:none}
  .header-btns .member-btn{display:none}
  .hamburger{display:block}
  .header-inner{justify-content:space-between}
}
@media(max-width:760px){
  .container{width:min(calc(100% - 28px),var(--容器))}
  .topbar .container{min-height:34px}
  .topbar .contact{gap:10px}
  .topbar .contact a:first-child{display:none}
  .header-inner{height:68px}
  .logo{min-width:0;font-size:16px}
  .logo img{width:32px;height:32px}
  .account-btn{padding:8px 10px}
  .video-page{padding:42px 0 10px}
  .video-page .page-heading{display:block}
  .video-page .intro{margin-top:16px}
  .video-grid{grid-template-columns:1fr;gap:18px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px 20px}
  .footer{margin-top:48px;padding-top:38px}
}
@media(max-width:460px){
  .topbar{font-size:11px}
  .footer-grid{grid-template-columns:1fr}
  .video-page h1{font-size:40px}
}