:root{--theme:#0B3D91;--ink:#17233d;--muted:#6d7890;--line:#e5e9f1;--soft:#f4f7fb;--white:#fff}
    *{box-sizing:border-box}html,body{margin:0;padding:0;color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;background:#f7f9fc}a{text-decoration:none;color:inherit}button{font:inherit}.container{width:min(1180px,calc(100% - 40px));margin:auto}
    .topbar{background:#10213f;color:#dce7fa;font-size:13px}.topbar-inner{height:36px;display:flex;align-items:center;justify-content:space-between}.topbar-contact{display:flex;gap:22px}.topbar a{color:#dce7fa}
    .header{height:78px;background:#fff;border-bottom:1px solid var(--line);position:relative;z-index:20}.header-inner{height:78px;display:flex;align-items:center;gap:36px}.logo{display:inline-flex;align-items:center;gap:10px;white-space:nowrap;font-weight:800;color:var(--ink);font-size:18px}.logo img{width:38px;height:38px;object-fit:contain}.main-nav{flex:1}.nav-list{list-style:none;margin:0;padding:0;display:flex;align-items:stretch;gap:4px}.nav-item{position:relative}.nav-link{display:flex;align-items:center;height:78px;padding:0 14px;font-size:14px;color:#35415a}.nav-link:hover{color:var(--theme)}.has-arrow:after{content:"⌄";font-size:13px;margin-left:6px}.header-btns{display:flex;align-items:center;gap:16px;font-size:14px;color:var(--theme)}.header-btns>a{border:1px solid var(--theme);padding:9px 17px;border-radius:5px}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% - 1px);left:50%;transform:translateX(-50%);opacity:0;visibility:hidden;pointer-events:none;transition:.2s;background:#fff;box-shadow:0 18px 40px #14284b1f;border:1px solid var(--line);border-radius:0 0 10px 10px}.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;pointer-events:auto}.dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}.dropdown-panel{width:310px}.dropdown-shell,.mega-shell{padding:22px}.dropdown-title,.mega-title{margin:0 0 13px;font-size:13px;color:var(--theme);font-weight:800}.dropdown-list{display:grid;gap:10px}.dropdown-list a{font-size:14px;line-height:1.5}.mega-menu{width:760px}.mega-layout{display:grid;grid-template-columns:170px 1fr;gap:26px}.mega-category-links{display:grid;gap:9px;font-size:13px;color:#55627a}.mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.mega-card{display:flex;gap:10px;min-width:0;padding:10px;border:1px solid var(--line);border-radius:7px;background:#fbfcfe}.mega-card img{width:36px;height:36px;object-fit:cover;border-radius:5px;flex:none}.mega-card strong{display:block;font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.mega-stats,.mega-summary{display:block;color:var(--muted);font-size:11px;line-height:1.55;margin-top:3px}.mega-stats span{margin-right:7px}.mega-footer{display:block;margin-top:18px;padding-top:13px;border-top:1px solid var(--line);font-size:13px;color:var(--theme)}
    .hamburger{display:none;border:0;background:none;padding:5px;cursor:pointer}.hamburger span{display:block;width:24px;height:2px;background:var(--ink);margin:5px 0;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:#07152d99;opacity:0;visibility:hidden;z-index:40;transition:.2s}.drawer-overlay.open{opacity:1;visibility:visible}.mobile-drawer{position:fixed;right:-360px;top:0;width:min(360px,88vw);height:100vh;background:#fff;z-index:50;transition:.25s;overflow:auto}.mobile-drawer.open{right:0}.drawer-head{height:70px;display:flex;align-items:center;gap:16px;padding:0 20px;border-bottom:1px solid var(--line);color:var(--theme)}.drawer-head .logo{flex:1}.drawer-close{border:0;background:none;font-size:30px;color:#657088;cursor:pointer}.drawer-menu{padding:12px 20px 35px}.drawer-link,.drawer-toggle{display:block;width:100%;padding:15px 0;border:0;border-bottom:1px solid var(--line);background:none;text-align:left;color:var(--ink);font-size:15px}.drawer-toggle:after{content:"＋";float:right;color:var(--theme)}.drawer-toggle.active:after{content:"－"}.drawer-submenu{display:none;padding:5px 0 8px 14px}.drawer-submenu.open{display:grid}.drawer-submenu a{padding:9px 0;color:var(--muted);font-size:14px}
    .video-detail-main{padding:52px 0 80px}.video-breadcrumb{font-size:13px;color:var(--muted);margin-bottom:20px}.video-breadcrumb a{color:var(--theme)}.video-detail-head{max-width:900px;margin:0 auto 26px;text-align:center}.video-detail-head h1{font-size:clamp(28px,4vw,46px);line-height:1.2;margin:0 0 18px;color:#13213c}.video-meta{display:flex;justify-content:center;gap:20px;flex-wrap:wrap;color:var(--muted);font-size:14px}.video-stage{max-width:1020px;margin:0 auto;background:#0e1728;border-radius:12px;overflow:hidden;box-shadow:0 18px 50px #12234424}.video-player{min-height:520px;display:flex;align-items:center;justify-content:center;color:#fff;background:linear-gradient(135deg,#071326,#193d70 52%,#09101e);position:relative}.video-player:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 50% 40%,#4a8bdd40,transparent 42%)}.video-player>*{position:relative;z-index:1;max-width:100%}.video-player video,.video-player iframe{width:100%;min-height:520px;border:0}.video-player .player-placeholder{width:76px;height:76px;border-radius:50%;display:grid;place-items:center;background:#fff;color:var(--theme);font-size:30px;padding-left:5px}.video-caption{padding:15px 22px;color:#dce7fa;font-size:14px;display:flex;justify-content:space-between;gap:12px}.video-content-wrap{max-width:1020px;margin:28px auto 0;display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:28px}.video-content,.related-videos{background:#fff;border:1px solid var(--line);border-radius:10px;padding:25px}.video-content h2,.related-videos h2{margin:0 0 18px;font-size:20px}.video-description{color:#59667d;line-height:1.9;margin-bottom:22px}.video-body{min-width:0;max-width:100%;overflow-x:auto;color:#35415a;line-height:1.9}.video-body img,.video-body table{max-width:100%;height:auto}.video-tags{display:flex;gap:8px;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:18px;margin-top:22px}.video-tags a,.video-tags span{font-size:12px;background:#edf3fb;color:var(--theme);border-radius:20px;padding:5px 11px}.related-list{display:grid;gap:15px}.related-card{display:grid;grid-template-columns:90px 1fr;gap:10px;align-items:center}.related-card img{width:90px;height:60px;object-fit:cover;border-radius:5px;background:#e7edf6}.related-card strong{font-size:13px;line-height:1.45;display:block}.related-card small{display:block;margin-top:5px;color:var(--muted)}.more-video{display:block;margin-top:18px;padding-top:14px;border-top:1px solid var(--line);color:var(--theme);font-size:13px}
    .footer{background:#101d35;color:#b9c6dc}.footer-main{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:42px;padding:52px 0 38px}.footer .logo{color:#fff}.footer-brand p{font-size:13px;line-height:1.8;max-width:320px}.footer h3{font-size:15px;color:#fff;margin:4px 0 18px}.footer-links{display:grid;gap:11px;font-size:13px}.footer-links a:hover{color:#fff}.footer-contact{display:grid;gap:12px;font-size:13px;line-height:1.7}.footer-contact a{color:#dce7fa}.footer-bottom{border-top:1px solid #ffffff1a;padding:18px 0;display:flex;justify-content:space-between;gap:20px;font-size:12px}
    @media(max-width:1120px){.main-nav{display:none}.header-btns{margin-left:auto}.hamburger{display:block}.footer-main{grid-template-columns:repeat(2,1fr)}}
    @media(max-width:760px){.container{width:min(100% - 28px,1180px)}.topbar-inner{height:auto;min-height:36px;padding:8px 0;align-items:flex-start;gap:8px}.topbar-contact{gap:8px;flex-direction:column;text-align:right}.header,.header-inner{height:68px}.mega-menu{display:none}.video-detail-main{padding:32px 0 55px}.video-player{min-height:260px}.video-player video,.video-player iframe{min-height:260px}.video-content-wrap{grid-template-columns:1fr}.video-caption{display:block;line-height:1.8}.video-caption span{display:block}.footer-main{grid-template-columns:1fr;gap:28px;padding:36px 0 28px}.footer-bottom{display:block;line-height:2}.footer-bottom span{display:block}}