:root{--主题色:#0B3D91;--深色:#172033;--浅色:#f5f7fb;--边框:#e4e8f0;--白色:#fff}
*{box-sizing:border-box}html,body{margin:0;padding:0;color:var(--深色);background:#f7f9fc;font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.6}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.container{width:min(1180px,calc(100% - 40px));margin:auto}
.topbar{background:#111a2d;color:#cbd5e1;font-size:13px}.topbar-inner{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}.topbar p{margin:0}.topbar-contact{display:flex;gap:20px}.topbar a:hover{color:#fff}
.header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--边框)}.header-inner{height:78px;display:flex;align-items:center;gap:34px}.logo{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:800;white-space:nowrap;color:var(--主题色)}.logo img{width:36px;height:36px;object-fit:contain}.main-nav{margin-left:auto}.nav-list{display:flex;align-items:center;gap:4px;list-style:none;margin:0;padding:0}.nav-item{position:relative}.nav-link{display:block;padding:28px 14px;font-size:15px;font-weight:600;white-space:nowrap}.nav-link:hover,.nav-link:focus{color:var(--主题色)}.has-arrow:after{content:"⌄";font-size:12px;margin-left:6px}.dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translate(-50%,8px);width:310px;padding:20px;background:#fff;border:1px solid var(--边框);border-radius:0 0 14px 14px;box-shadow:0 18px 40px #1720331c;opacity:0;visibility:hidden;transition:.2s;z-index:30}.mega-menu{width:660px}.mega-menu-wide{width:820px}.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;top:-12px;left:0;right:0;height:12px}.dropdown-title,.mega-head{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:14px}.dropdown-title span,.mega-head strong{font-weight:800}.dropdown-title a,.mega-footer{color:var(--主题色);font-size:13px}.dropdown-article{display:block;padding:10px 0;border-top:1px solid var(--边框);font-size:14px}.dropdown-article:hover{color:var(--主题色)}.mega-head{display:block}.mega-head strong{display:block}.mega-head span{display:block;color:#7b879b;font-size:12px}.mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.mega-card{display:flex;gap:9px;padding:10px;border:1px solid var(--边框);border-radius:10px;background:#fbfcff;min-width:0}.mega-card>img{width:38px;height:38px;object-fit:contain;flex:0 0 38px}.mega-card-body{min-width:0}.mega-card-body strong{display:block;font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.mega-card-body small,.mega-card-body p{display:block;margin:2px 0;color:#7b879b;font-size:11px;line-height:1.45}.video-mega-card>img{width:68px;height:42px;flex-basis:68px;object-fit:cover}.mega-categories{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:15px}.mega-categories a{padding:5px 10px;background:#eef3fb;border-radius:20px;color:var(--主题色);font-size:12px}.mega-footer{display:block;margin-top:16px;padding-top:13px;border-top:1px solid var(--边框);text-align:right}
.header-btns{display:flex;align-items:center;gap:12px}.member-entry{font-size:14px;color:var(--主题色);font-weight:700}.account-entry{padding:9px 16px;color:#fff;background:var(--主题色);border-radius:7px;font-size:13px}.hamburger{display:none;border:0;background:transparent;padding:8px;cursor:pointer}.hamburger span{display:block;width:23px;height:2px;margin:4px;background:var(--深色);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{display:none;position:fixed;inset:0;background:#07112699;z-index:50}.drawer-overlay.open{display:block}.mobile-drawer{position:fixed;top:0;right:0;width:min(370px,88vw);height:100vh;background:#fff;z-index:51;transform:translateX(100%);transition:.25s;overflow:auto}.mobile-drawer.open{transform:translateX(0)}.drawer-head{display:flex;align-items:center;justify-content:space-between;padding:20px;border-bottom:1px solid var(--边框);color:var(--主题色);font-weight:800}.drawer-head a{padding:6px 12px;background:var(--主题色);color:#fff;border-radius:5px;font-size:13px;margin-left:auto;margin-right:12px}.drawer-close{border:0;background:none;font-size:28px;cursor:pointer;color:#68758a}.drawer-menu{padding:10px 20px}.drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid var(--边框);background:none;text-align:left;font:inherit;font-weight:700;cursor:pointer}.drawer-toggle:after{content:"＋";float:right;color:#8290a5}.drawer-toggle.active:after{content:"－"}.drawer-submenu{display:none;padding:4px 0 8px 16px}.drawer-submenu.open{display:block}.drawer-submenu a{display:block;padding:8px 0;color:#64748b;font-size:14px}.drawer-lock{overflow:hidden}
.video-page{padding:58px 0 80px}.page-heading{text-align:center;margin-bottom:34px}.eyebrow{color:var(--主题色);font-size:13px;font-weight:800;letter-spacing:2px}.page-heading h1{margin:8px 0 10px;font-size:clamp(30px,4vw,48px);line-height:1.2}.page-heading p{max-width:660px;margin:auto;color:#68758a}.video-filter{display:flex;justify-content:center;flex-wrap:wrap;gap:10px;margin:0 auto 32px}.video-filter span{padding:8px 16px;border:1px solid #d9e1ef;border-radius:30px;background:#fff;color:#66748a;font-size:14px}.video-filter span:first-child{background:var(--主题色);border-color:var(--主题色);color:#fff}.video-list{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.video-card{overflow:hidden;background:#fff;border:1px solid var(--边框);border-radius:16px;box-shadow:0 10px 25px #18243b0a;transition:.2s}.video-card:hover{transform:translateY(-4px);box-shadow:0 16px 30px #18243b18}.video-cover{position:relative;aspect-ratio:16/9;background:#dce5f3;overflow:hidden}.video-cover img{width:100%;height:100%;object-fit:cover}.play-mark{position:absolute;left:18px;bottom:16px;width:42px;height:42px;display:grid;place-items:center;border-radius:50%;background:#fff;color:var(--主题色);box-shadow:0 5px 15px #0003}.duration{position:absolute;right:12px;bottom:12px;padding:3px 8px;border-radius:5px;background:#101827d9;color:#fff;font-size:12px}.video-body{padding:18px}.video-body h2{margin:0 0 8px;font-size:19px;line-height:1.4}.video-body h2 a:hover{color:var(--主题色)}.video-body p{margin:0 0 14px;color:#68758a;font-size:14px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.video-meta{display:flex;justify-content:space-between;gap:8px;color:#8995a7;font-size:12px;border-top:1px solid var(--边框);padding-top:12px}.video-more{display:inline-block;margin-top:12px;color:var(--主题色);font-size:13px;font-weight:700}.pagination{display:flex;justify-content:center;gap:8px;margin-top:40px;flex-wrap:wrap}.pagination a{min-width:36px;padding:7px 12px;text-align:center;background:#fff;border:1px solid var(--边框);border-radius:6px;color:#617087}.pagination a:hover,.pagination a.active{background:var(--主题色);border-color:var(--主题色);color:#fff}
.footer{padding:52px 0 20px;background:#111a2d;color:#bdc8d9}.footer-main{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:38px}.footer .logo{color:#fff}.footer-brand p{max-width:330px;color:#93a1b5;font-size:13px}.footer h3{margin:0 0 14px;color:#fff;font-size:15px}.footer-links{display:grid;gap:8px;font-size:13px}.footer-links a:hover,.footer-contact a:hover{color:#fff}.footer-contact{display:grid;gap:4px;font-size:13px}.footer-contact span{color:#8290a5;margin-top:5px}.footer-social{color:#fff}.footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:40px;padding-top:18px;border-top:1px solid #ffffff1a;font-size:12px;color:#8290a5}.footer-bottom-links{display:flex;gap:18px}
@media(max-width:900px){.main-nav{display:none}.header-inner{height:68px}.header-btns{margin-left:auto}.hamburger{display:block}.member-entry{display:none}.mega-grid{grid-template-columns:repeat(2,1fr)}.video-list{grid-template-columns:repeat(2,1fr)}.footer-main{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.container{width:min(100% - 28px,1180px)}.topbar-inner{padding:8px 0;display:block}.topbar-contact{margin-top:3px;gap:12px}.page-heading{margin-bottom:25px}.video-page{padding:40px 0 55px}.video-list{grid-template-columns:1fr;gap:16px}.footer-main{grid-template-columns:1fr;gap:25px}.footer-bottom{display:block}.footer-bottom-links{margin-top:10px}.mega-menu{width:calc(100vw - 30px)}}