:root{
      --theme:#0B3D91;
      --theme-dark:#07285f;
      --theme-soft:#eaf1ff;
      --accent:#ff765f;
      --cream:#fff8ed;
      --ink:#202631;
      --muted:#697386;
      --line:#e3e8f0;
      --surface:#ffffff;
      --page:#f5f7fb;
      --shadow:0 18px 48px rgba(25,44,80,.12);
      --radius:20px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      color:var(--ink);
      background:var(--page);
      font-family:"Microsoft YaHei","PingFang SC","Noto Sans SC",Arial,sans-serif;
      line-height:1.65;
    }
    body,button,input{font:inherit}
    img{display:block;max-width:100%}
    a{color:inherit;text-decoration:none}
    button{color:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .topbar{
      color:#dbe7ff;
      background:var(--theme-dark);
      font-size:13px;
    }
    .topbar .container{
      min-height:38px;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:18px;
    }
    .topbar-links{display:flex;align-items:center;gap:22px}
    .topbar a:hover{color:#fff}
    .header{
      position:relative;
      z-index:50;
      background:rgba(255,255,255,.98);
      border-bottom:1px solid var(--line);
      box-shadow:0 8px 30px rgba(20,39,73,.05);
    }
    .header-inner{
      min-height:78px;
      display:flex;
      align-items:center;
      gap:24px;
    }
    .logo{
      flex:none;
      display:inline-flex;
      align-items:center;
      gap:11px;
      color:var(--theme-dark);
      font-size:20px;
      font-weight:800;
      letter-spacing:.02em;
    }
    .logo img{
      width:42px;
      height:42px;
      border-radius:12px;
      object-fit:contain;
      background:#fff;
    }
    .main-nav{align-self:stretch;margin-left:auto}
    .nav-list{
      height:100%;
      margin:0;
      padding:0;
      display:flex;
      align-items:stretch;
      list-style:none;
    }
    .nav-item{
      position:relative;
      display:flex;
      align-items:center;
    }
    .nav-link{
      height:100%;
      padding:0 13px;
      display:flex;
      align-items:center;
      color:#303847;
      font-size:15px;
      font-weight:650;
      white-space:nowrap;
      transition:.2s ease;
    }
    .nav-link:hover,
    .nav-item:focus-within>.nav-link{
      color:var(--theme);
      background:var(--theme-soft);
    }
    .has-arrow::after{
      content:"";
      width:6px;
      height:6px;
      margin-left:7px;
      border-right:1.5px solid currentColor;
      border-bottom:1.5px solid currentColor;
      transform:rotate(45deg) translateY(-2px);
    }
    .dropdown-panel,
    .mega-menu{
      position:absolute;
      top:100%;
      left:50%;
      z-index:60;
      padding-top:10px;
      opacity:0;
      visibility:hidden;
      pointer-events:none;
      transform:translate(-50%,8px);
      transition:opacity .2s ease,transform .2s ease,visibility .2s ease;
    }
    .dropdown-panel::before,
    .mega-menu::before{
      content:"";
      position:absolute;
      top:0;
      left:0;
      right:0;
      height:12px;
    }
    .nav-item:hover>.dropdown-panel,
    .nav-item:hover>.mega-menu,
    .nav-item:focus-within>.dropdown-panel,
    .nav-item:focus-within>.mega-menu{
      opacity:1;
      visibility:visible;
      pointer-events:auto;
      transform:translate(-50%,0);
    }
    .dropdown-panel{width:330px}
    .mega-menu{width:min(930px,calc(100vw - 32px))}
    .dropdown-inner,
    .mega-inner{
      background:var(--surface);
      border:1px solid var(--line);
      border-radius:18px;
      box-shadow:var(--shadow);
    }
    .dropdown-inner{padding:12px}
    .dropdown-inner>a:not(.mega-footer){
      display:block;
      padding:10px 12px;
      border-radius:10px;
      color:#3c4657;
      overflow:hidden;
      text-overflow:ellipsis;
      white-space:nowrap;
    }
    .dropdown-inner>a:not(.mega-footer):hover{
      color:var(--theme);
      background:var(--theme-soft);
    }
    .mega-inner{padding:22px}
    .mega-heading{
      margin:0 0 12px;
      color:var(--theme-dark);
      font-size:13px;
      font-weight:800;
      letter-spacing:.1em;
    }
    .mega-grid{
      display:grid;
      grid-template-columns:repeat(3,minmax(0,1fr));
      gap:10px;
    }
    .mega-card{
      min-width:0;
      padding:11px;
      display:flex;
      align-items:center;
      gap:11px;
      border:1px solid #edf0f5;
      border-radius:13px;
      background:#fbfcfe;
      transition:.2s ease;
    }
    .mega-card:hover{
      border-color:#bfd1f3;
      background:var(--theme-soft);
      transform:translateY(-2px);
    }
    .mega-card img{
      width:45px;
      height:45px;
      flex:none;
      object-fit:cover;
      border-radius:10px;
      background:#fff;
    }
    .mega-card span{min-width:0;display:block}
    .mega-card strong,
    .mega-card small{
      display:block;
      overflow:hidden;
      text-overflow:ellipsis;
      white-space:nowrap;
    }
    .mega-card strong{font-size:14px}
    .mega-card small{color:var(--muted);font-size:11px}
    .mega-columns{
      display:grid;
      grid-template-columns:220px minmax(0,1fr);
      gap:24px;
    }
    .mega-links{display:grid;gap:7px}
    .mega-links a{
      padding:8px 10px;
      color:#465166;
      border-radius:9px;
    }
    .mega-links a:hover{color:var(--theme);background:var(--theme-soft)}
    .mega-footer{
      margin-top:16px;
      padding:11px 14px;
      display:block;
      color:var(--theme);
      text-align:center;
      font-weight:750;
      border-radius:11px;
      background:var(--theme-soft);
    }
    .header-btns{
      flex:none;
      display:flex;
      align-items:center;
      gap:9px;
    }
    .member-btn,
    .open-btn{
      padding:9px 14px;
      border-radius:10px;
      font-size:14px;
      font-weight:750;
      white-space:nowrap;
    }
    .member-btn{color:var(--theme);border:1px solid #b8caec}
    .open-btn{color:#fff;background:var(--theme)}
    .member-btn:hover{background:var(--theme-soft)}
    .open-btn:hover{background:var(--theme-dark)}
    .hamburger{
      width:42px;
      height:42px;
      padding:9px;
      display:none;
      flex-direction:column;
      align-items:center;
      justify-content:center;
      gap:5px;
      border:0;
      border-radius:10px;
      background:var(--theme-soft);
      cursor:pointer;
    }
    .hamburger span{
      width:21px;
      height:2px;
      display:block;
      background:var(--theme);
      transition:.2s ease;
    }
    .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;
      z-index:98;
      visibility:hidden;
      opacity:0;
      background:rgba(7,20,44,.58);
      transition:.25s ease;
    }
    .drawer-overlay.open{visibility:visible;opacity:1}
    .mobile-drawer{
      position:fixed;
      top:0;
      right:0;
      bottom:0;
      z-index:99;
      width:min(390px,88vw);
      overflow-y:auto;
      background:#fff;
      box-shadow:-20px 0 50px rgba(0,0,0,.18);
      transform:translateX(105%);
      transition:transform .28s ease;
    }
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{
      min-height:72px;
      padding:14px 18px;
      display:flex;
      align-items:center;
      gap:12px;
      color:#fff;
      background:var(--theme);
    }
    .drawer-head strong{margin-right:auto}
    .drawer-head>a{
      padding:6px 11px;
      border:1px solid rgba(255,255,255,.5);
      border-radius:8px;
    }
    .drawer-close{
      width:34px;
      height:34px;
      padding:0;
      color:#fff;
      font-size:27px;
      line-height:1;
      border:0;
      background:transparent;
      cursor:pointer;
    }
    .drawer-menu{padding:14px}
    .drawer-link,
    .drawer-toggle{
      width:100%;
      padding:13px 12px;
      display:block;
      color:#273143;
      text-align:left;
      font-weight:750;
      border:0;
      border-bottom:1px solid #edf0f4;
      background:#fff;
      cursor:pointer;
    }
    .drawer-toggle{
      position:relative;
      padding-right:35px;
    }
    .drawer-toggle::after{
      content:"+";
      position:absolute;
      right:13px;
      color:var(--theme);
      font-size:20px;
      font-weight:400;
    }
    .drawer-toggle.active::after{content:"−"}
    .drawer-submenu{
      max-height:0;
      overflow:hidden;
      padding:0 11px;
      background:#f7f9fd;
      transition:max-height .28s ease,padding .28s ease;
    }
    .drawer-submenu.open{max-height:680px;padding:7px 11px}
    .drawer-submenu a{
      padding:9px 10px;
      display:block;
      color:#566176;
      font-size:14px;
      border-radius:8px;
    }
    .drawer-submenu a:hover{color:var(--theme);background:#fff}
    .video-page{min-height:700px}
    .video-page .video-intro{
      position:relative;
      overflow:hidden;
      padding:78px 0 70px;
      color:#fff;
      background:
        radial-gradient(circle at 15% 15%,rgba(255,118,95,.38),transparent 30%),
        radial-gradient(circle at 88% 30%,rgba(99,158,255,.3),transparent 32%),
        linear-gradient(135deg,#061c46 0%,#0B3D91 58%,#102d5d 100%);
    }
    .video-page .video-intro::before,
    .video-page .video-intro::after{
      content:"";
      position:absolute;
      border:1px solid rgba(255,255,255,.12);
      border-radius:50%;
    }
    .video-page .video-intro::before{
      width:360px;
      height:360px;
      right:-100px;
      top:-190px;
    }
    .video-page .video-intro::after{
      width:240px;
      height:240px;
      left:-100px;
      bottom:-160px;
    }
    .video-page .intro-inner{
      position:relative;
      z-index:1;
      max-width:820px;
      text-align:center;
    }
    .video-page .eyebrow{
      margin:0 0 12px;
      display:inline-flex;
      align-items:center;
      gap:8px;
      color:#ffe8df;
      font-size:13px;
      font-weight:800;
      letter-spacing:.14em;
    }
    .video-page .eyebrow::before{
      content:"";
      width:9px;
      height:9px;
      border-radius:50%;
      background:var(--accent);
      box-shadow:0 0 0 6px rgba(255,118,95,.17);
    }
    .video-page h1{
      margin:0;
      font-size:clamp(34px,5vw,58px);
      line-height:1.16;
      letter-spacing:-.04em;
    }
    .video-page .intro-copy{
      max-width:680px;
      margin:18px auto 0;
      color:#dce8ff;
      font-size:17px;
    }
    .video-page .intro-points{
      margin:25px 0 0;
      padding:0;
      display:flex;
      justify-content:center;
      flex-wrap:wrap;
      gap:10px;
      list-style:none;
    }
    .video-page .intro-points li{
      padding:8px 13px;
      color:#fff;
      font-size:13px;
      border:1px solid rgba(255,255,255,.2);
      border-radius:999px;
      background:rgba(255,255,255,.08);
      backdrop-filter:blur(8px);
    }
    .video-page .category-strip{
      position:relative;
      z-index:3;
      margin-top:-28px;
    }
    .video-page .category-panel{
      padding:18px;
      display:flex;
      align-items:center;
      gap:14px;
      border:1px solid var(--line);
      border-radius:18px;
      background:#fff;
      box-shadow:var(--shadow);
    }
    .video-page .category-label{
      flex:none;
      padding:8px 12px;
      color:#fff;
      font-size:13px;
      font-weight:800;
      border-radius:9px;
      background:var(--theme);
    }
    .video-page .category-links{
      min-width:0;
      display:flex;
      align-items:center;
      gap:8px;
      overflow-x:auto;
      scrollbar-width:thin;
    }
    .video-page .category-links a{
      flex:none;
      padding:8px 13px;
      color:#4c586d;
      font-size:14px;
      border:1px solid #e1e7f0;
      border-radius:999px;
      background:#fafbfd;
      transition:.2s ease;
    }
    .video-page .category-links a:hover{
      color:#fff;
      border-color:var(--theme);
      background:var(--theme);
    }
    .video-page .video-library{padding:66px 0 84px}
    .video-page .section-head{
      margin-bottom:25px;
      display:flex;
      align-items:flex-end;
      justify-content:space-between;
      gap:20px;
    }
    .video-page .section-kicker{
      margin:0 0 5px;
      color:var(--accent);
      font-size:13px;
      font-weight:850;
      letter-spacing:.12em;
    }
    .video-page .section-head h2{
      margin:0;
      color:#17233a;
      font-size:30px;
      line-height:1.25;
    }
    .video-page .section-head p{
      max-width:520px;
      margin:0;
      color:var(--muted);
      text-align:right;
    }
    .video-page .video-grid{
      display:grid;
      grid-template-columns:repeat(3,minmax(0,1fr));
      gap:24px;
    }
    .video-page .video-card{
      min-width:0;
      overflow:hidden;
      display:flex;
      flex-direction:column;
      border:1px solid var(--line);
      border-radius:18px;
      background:#fff;
      box-shadow:0 10px 26px rgba(32,52,87,.07);
      transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
    }
    .video-page .video-card:hover{
      border-color:#bdcdef;
      box-shadow:0 18px 38px rgba(21,53,105,.14);
      transform:translateY(-6px);
    }
    .video-page .video-cover{
      position:relative;
      overflow:hidden;
      aspect-ratio:16/9;
      background:#dce5f5;
    }
    .video-page .video-cover img{
      width:100%;
      height:100%;
      object-fit:cover;
      transition:transform .35s ease;
    }
    .video-page .video-card:hover .video-cover img{transform:scale(1.045)}
    .video-page .play-mark{
      position:absolute;
      inset:0;
      display:grid;
      place-items:center;
      background:linear-gradient(180deg,transparent 42%,rgba(5,16,35,.58));
    }
    .video-page .play-mark::before{
      content:"";
      width:54px;
      height:54px;
      border-radius:50%;
      background:rgba(255,255,255,.94);
      box-shadow:0 10px 25px rgba(0,0,0,.22);
    }
    .video-page .play-mark::after{
      content:"";
      position:absolute;
      border-top:8px solid transparent;
      border-bottom:8px solid transparent;
      border-left:12px solid var(--theme);
      transform:translateX(2px);
    }
    .video-page .duration{
      position:absolute;
      right:10px;
      bottom:9px;
      z-index:2;
      padding:3px 8px;
      color:#fff;
      font-size:12px;
      border-radius:6px;
      background:rgba(9,16,29,.82);
    }
    .video-page .video-body{
      min-width:0;
      padding:19px;
      display:flex;
      flex:1;
      flex-direction:column;
    }
    .video-page .video-meta{
      margin-bottom:8px;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:12px;
      color:var(--theme);
      font-size:12px;
      font-weight:800;
    }
    .video-page .video-meta span:last-child{color:#8a94a5;font-weight:600}
    .video-page .video-body h3{
      margin:0;
      color:#1e293b;
      font-size:18px;
      line-height:1.45;
    }
    .video-page .video-body p{
      margin:10px 0 17px;
      display:-webkit-box;
      overflow:hidden;
      color:var(--muted);
      font-size:14px;
      line-height:1.75;
      -webkit-box-orient:vertical;
      -webkit-line-clamp:3;
    }
    .video-page .watch-link{
      margin-top:auto;
      display:inline-flex;
      align-items:center;
      gap:7px;
      color:var(--theme);
      font-size:14px;
      font-weight:800;
    }
    .video-page .watch-link::after{
      content:"→";
      transition:transform .2s ease;
    }
    .video-page .video-card:hover .watch-link::after{transform:translateX(4px)}
    .video-page .empty-note{
      grid-column:1/-1;
      padding:45px;
      color:var(--muted);
      text-align:center;
      border:1px dashed #cfd8e8;
      border-radius:18px;
      background:#fff;
    }
    .video-page .pagination{
      margin-top:42px;
      display:flex;
      align-items:center;
      justify-content:center;
      flex-wrap:wrap;
      gap:8px;
    }
    .video-page .pagination a{
      min-width:42px;
      height:42px;
      padding:0 13px;
      display:inline-flex;
      align-items:center;
      justify-content:center;
      color:#4a566a;
      font-weight:700;
      border:1px solid #dce3ed;
      border-radius:10px;
      background:#fff;
    }
    .video-page .pagination a:hover,
    .video-page .pagination a.active,
    .video-page .pagination a.current{
      color:#fff;
      border-color:var(--theme);
      background:var(--theme);
    }
    .video-page .video-guidance{padding:0 0 86px}
    .video-page .guidance-box{
      padding:34px;
      display:grid;
      grid-template-columns:1fr auto;
      align-items:center;
      gap:30px;
      color:#fff;
      border-radius:22px;
      background:
        radial-gradient(circle at 85% 20%,rgba(255,118,95,.35),transparent 30%),
        linear-gradient(135deg,#101f39,#0B3D91);
      box-shadow:var(--shadow);
    }
    .video-page .guidance-box h2{margin:0 0 7px;font-size:26px}
    .video-page .guidance-box p{margin:0;color:#dce7fb}
    .video-page .guidance-actions{
      display:flex;
      align-items:center;
      gap:10px;
    }
    .video-page .guidance-actions a{
      padding:11px 16px;
      font-weight:800;
      border-radius:10px;
      white-space:nowrap;
    }
    .video-page .guidance-actions a:first-child{color:var(--theme);background:#fff}
    .video-page .guidance-actions a:last-child{border:1px solid rgba(255,255,255,.45)}
    .footer{
      padding:62px 0 0;
      color:#b9c5d8;
      background:#09182f;
    }
    .footer-grid{
      display:grid;
      grid-template-columns:1.45fr 1fr 1fr 1fr;
      gap:42px;
    }
    .footer .logo{color:#fff}
    .footer-brand p{max-width:390px;margin:18px 0 0;color:#aab7cb;font-size:14px}
    .footer h3{
      margin:5px 0 17px;
      color:#fff;
      font-size:15px;
    }
    .footer-grid>div:not(.footer-brand)>a{
      margin:9px 0;
      display:block;
      color:#b9c5d8;
      font-size:14px;
    }
    .footer-grid a:hover{color:#fff}
    .footer-grid>div>p{font-size:14px}
    .footer-bottom{
      margin-top:46px;
      padding:20px 0;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:20px;
      color:#8493aa;
      font-size:13px;
      border-top:1px solid rgba(255,255,255,.1);
    }
    @media (max-width:1100px){
      .main-nav{display:none}
      .hamburger{display:flex}
      .header-btns{margin-left:auto}
      .video-page .video-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
      .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
    }
    @media (max-width:760px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{padding:8px 0;align-items:flex-start;flex-direction:column;gap:2px}
      .topbar-links{gap:4px;align-items:flex-start;flex-direction:column}
      .header-inner{min-height:68px;gap:10px}
      .logo{font-size:17px}
      .logo img{width:37px;height:37px}
      .member-btn{display:none}
      .open-btn{padding:8px 11px;font-size:13px}
      .video-page .video-intro{padding:58px 0 60px}
      .video-page .intro-copy{font-size:15px}
      .video-page .category-panel{align-items:flex-start;flex-direction:column}
      .video-page .category-links{width:100%}
      .video-page .video-library{padding:52px 0 68px}
      .video-page .section-head{align-items:flex-start;flex-direction:column}
      .video-page .section-head p{text-align:left}
      .video-page .video-grid{grid-template-columns:1fr}
      .video-page .guidance-box{padding:27px;grid-template-columns:1fr}
      .video-page .guidance-actions{align-items:stretch;flex-direction:column}
      .video-page .guidance-actions a{text-align:center}
      .footer-grid{grid-template-columns:1fr;gap:28px}
      .footer-bottom{align-items:flex-start;flex-direction:column}
    }
    @media (max-width:420px){
      .header-btns .open-btn{display:none}
      .video-page .intro-points{align-items:stretch;flex-direction:column}
      .video-page .intro-points li{text-align:center}
    }