:root{--blue:#0B3D91;--ink:#172033;--muted:#687386;--line:#e5e9f0;--soft:#f5f7fb;--white:#fff}
    *{box-sizing:border-box}body{margin:0;color:var(--ink);font:15px/1.7 Arial,"Microsoft YaHei",sans-serif;background:#f7f8fb}a{color:inherit;text-decoration:none}.container{width:min(1180px,calc(100% - 36px));margin:auto}
    .topbar{height:38px;background:#142238;color:#dbe4f3;font-size:13px}.topbar .container{height:100%;display:flex;align-items:center;justify-content:space-between}.topbar a{color:#fff}.header{position:relative;background:#fff;border-bottom:1px solid var(--line);z-index:10}.header-inner{height:76px;display:flex;align-items:center;gap:30px}.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;color:var(--blue);white-space:nowrap}.logo img{width:36px;height:36px;object-fit:contain}.main-nav{flex:1}.nav-list{display:flex;align-items:center;justify-content:center;gap:4px;list-style:none;margin:0;padding:0}.nav-list>li{position:relative}.nav-link{display:block;padding:25px 14px;color:#29354a;font-weight:600;white-space:nowrap}.nav-link:hover{color:var(--blue)}.has-arrow:after{content:"⌄";margin-left:6px;color:#8490a3}.dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%);width:285px;background:#fff;border:1px solid var(--line);box-shadow:0 18px 40px #1524421c;border-radius:0 0 12px 12px;padding:20px;opacity:0;visibility:hidden;transition:.2s;z-index:20}.mega-menu{width:650px}.nav-list>li:hover .dropdown-panel,.nav-list>li:hover .mega-menu,.nav-list>li:focus-within .dropdown-panel,.nav-list>li:focus-within .mega-menu{opacity:1;visibility:visible}.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;font-weight:800;color:var(--blue)}.drop-item{display:block;padding:8px 0;border-bottom:1px solid var(--line);color:#39465b}.drop-item:hover{color:var(--blue)}.mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.mega-card{display:flex;gap:9px;padding:10px;border:1px solid var(--line);border-radius:9px;background:#fafbfd;font-size:12px;min-width:0}.mega-card img{width:38px;height:38px;object-fit:cover;border-radius:6px;flex:none}.mega-card strong,.mega-card span span{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.mega-card strong{font-size:13px}.mega-card span span{color:var(--muted);font-size:11px}.mega-footer{display:block;color:var(--blue);font-weight:700;margin-top:15px}.header-btns{display:flex;align-items:center;gap:9px;white-space:nowrap}.member-btn,.open-btn{padding:8px 12px;border-radius:7px;font-size:13px}.member-btn{color:var(--blue);border:1px solid #cbd7eb}.open-btn{background:var(--blue);color:#fff}.hamburger{display:none;border:0;background:none;padding:8px;cursor:pointer}.hamburger span{display:block;width:23px;height:2px;background:#1d2c44;margin:5px 0;transition:.2s}.mobile-drawer,.drawer-overlay{display:none}
    .video-detail-main{padding:48px 0 76px}.crumb{color:var(--muted);font-size:13px;margin-bottom:18px}.crumb a{color:var(--blue)}.video-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:28px;align-items:start}.video-card,.video-side,.video-body,.video-related{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:0 10px 28px #243b6410}.video-card{overflow:hidden}.video-player{background:#101827;aspect-ratio:16/9;display:flex;align-items:center;justify-content:center;color:#fff;position:relative}.video-player:before{content:"▶";display:grid;place-items:center;width:72px;height:72px;border:2px solid #fff;border-radius:50%;font-size:25px;padding-left:4px}.video-player .player-label{position:absolute;bottom:16px;left:20px;padding:5px 10px;border-radius:5px;background:#0008;font-size:12px}.video-info{padding:28px}.video-info h1{font-size:30px;line-height:1.3;margin:0 0 12px;color:#162b50}.video-meta{display:flex;flex-wrap:wrap;gap:16px;color:var(--muted);font-size:13px;border-bottom:1px solid var(--line);padding-bottom:17px}.video-summary{color:#536075;margin:18px 0 0}.video-body{margin-top:22px;padding:30px;min-width:0;max-width:100%;overflow-x:auto}.video-body h2{font-size:21px;margin:0 0 16px;color:#162b50}.video-body img,.video-body table{max-width:100%}.video-side{padding:22px}.video-side h2{font-size:18px;margin:0 0 14px}.side-link{display:block;padding:13px 0;border-bottom:1px solid var(--line);font-weight:600}.side-link:hover{color:var(--blue)}.side-more{display:block;margin-top:17px;color:var(--blue);font-weight:700}.video-related{margin-top:22px;padding:22px}.video-related h2{font-size:19px;margin:0 0 15px}.related-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:13px}.related-item{border:1px solid var(--line);border-radius:9px;padding:12px}.related-item img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:6px;background:#e9edf4}.related-item strong{display:block;margin-top:7px;font-size:14px;line-height:1.5}.footer{background:#142238;color:#d8e1ef;padding:44px 0 18px}.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:35px}.footer-brand{font-size:20px;font-weight:800;color:#fff}.footer h3{font-size:15px;color:#fff;margin:0 0 12px}.footer p{margin:5px 0;color:#aebbd0;font-size:13px}.footer a{display:block;color:#b8c5d8;font-size:13px;margin:6px 0}.footer a:hover{color:#fff}.footer-social{margin-top:12px}.footer-bottom{border-top:1px solid #ffffff1c;margin-top:30px;padding-top:16px;color:#9cabc0;font-size:12px}
    @media(max-width:900px){.main-nav{display:none}.header-inner{height:66px}.header-btns{margin-left:auto}.hamburger{display:block}.member-btn{display:none}.mega-menu{width:min(650px,calc(100vw - 30px))}.video-layout{grid-template-columns:1fr}.footer-grid{grid-template-columns:repeat(2,1fr)}}
    @media(max-width:600px){.container{width:min(100% - 26px,1180px)}.topbar{height:auto;padding:7px 0}.topbar .container{display:block}.topbar .contact{display:block}.open-btn{display:none}.video-detail-main{padding:28px 0 50px}.video-info{padding:20px}.video-info h1{font-size:23px}.video-body{padding:20px}.related-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr;gap:22px}.mobile-drawer{display:block;position:fixed;top:0;right:-350px;width:min(350px,88vw);height:100vh;background:#fff;z-index:50;transition:.25s;overflow:auto}.mobile-drawer.open{right:0}.drawer-overlay{display:block;position:fixed;inset:0;background:#07132699;z-index:40;opacity:0;visibility:hidden;transition:.25s}.drawer-overlay.open{opacity:1;visibility:visible}.drawer-head{display:flex;align-items:center;gap:14px;padding:18px;border-bottom:1px solid var(--line);font-weight:700}.drawer-head span{flex:1;color:var(--blue)}.drawer-head a{background:var(--blue);color:#fff;padding:4px 10px;border-radius:5px;font-size:13px}.drawer-close{font-size:26px;border:0;background:none;color:#637087}.drawer-menu{padding:8px 18px}.drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;text-align:left;border:0;border-bottom:1px solid var(--line);background:none;font:inherit;color:var(--ink)}.drawer-toggle:after{content:"＋";float:right;color:var(--blue)}.drawer-toggle.active:after{content:"－"}.drawer-submenu{display:none;padding:4px 0 8px 15px}.drawer-submenu.open{display:block}.drawer-submenu a{display:block;padding:7px 0;color:var(--muted);font-size:14px}}