/* header.css - 顶部导航 */
.header{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:0;transition:.3s}
.header.is-transparent{background:rgba(10,22,40,.68);backdrop-filter:blur(10px)}
.header.is-transparent .logo-title{color:#fff}
.header.is-transparent .logo-copy small{color:rgba(255,255,255,.7)}
.header.is-transparent .nav>li>a{color:rgba(255,255,255,.92)}
.header.is-transparent .nav>li>a:hover,.header.is-transparent .nav>li>a.active{color:#fff}
.header.is-transparent .nav::before{background:rgba(255,255,255,.16)}
.header.is-transparent .mobile-toggle{color:#fff}
.header-inner{max-width:1400px;margin:0 auto;padding:0 24px;height:84px;display:flex;align-items:center;justify-content:space-between}
.logo{height:84px;display:flex;align-items:center;gap:12px;flex-shrink:0}
.site-logo-img{display:block;width:auto;height:44px;object-fit:contain;flex-shrink:0}
.logo-copy{display:flex;flex-direction:column;gap:7px;line-height:1.12;white-space:nowrap}
.logo-title{display:block;font-size:18px;font-weight:400;color:var(--dark)}
.logo-copy small{display:block;font-size:12px;font-weight:400;color:var(--gray-500)}
.nav{display:flex;gap:6px;align-items:center;position:relative}
.nav li{position:relative;z-index:1}
.nav>li>a{display:block;padding:0 12px;height:36px;line-height:36px;font-size:13px;color:var(--gray-700);font-weight:500;border-radius:999px;transition:.2s}
.nav>li>a:hover,.nav>li>a.active{color:var(--primary)}
.nav::before{content:"";position:absolute;top:50%;left:0;width:var(--nav-pill-w,0);height:36px;border-radius:999px;background:var(--primary-soft);opacity:var(--nav-pill-o,0);transform:translate(var(--nav-pill-x,0),-50%);transition:transform .24s ease,width .24s ease,opacity .2s ease,background .2s ease;pointer-events:none}
.nav .has-submenu>a::after{content:"";display:inline-block;margin-left:6px;border-left:4px solid transparent;border-right:4px solid transparent;border-top:5px solid currentColor;vertical-align:middle}
.submenu{position:absolute;top:44px;left:50%;min-width:338px;transform:translate(-50%,8px);background:rgba(10,22,40,.92);backdrop-filter:blur(12px);border:1px solid rgba(255,255,255,.12);border-radius:10px;box-shadow:0 18px 36px rgba(0,0,0,.22);padding:6px;opacity:0;visibility:hidden;transition:.2s;z-index:1001}
.has-submenu:hover .submenu,.has-submenu:focus-within .submenu{opacity:1;visibility:visible;transform:translate(-50%,0)}
.submenu a{display:block;padding:9px 14px;font-size:12px;color:rgba(255,255,255,.78);white-space:nowrap;border-radius:8px}
.submenu a:hover,.submenu a.active{background:rgba(255,255,255,.14);color:#fff}
.nav .cta{margin-left:14px}
.nav .cta a{display:inline-block;padding:8px 17px;background:var(--primary);color:#fff;border-radius:var(--radius-sm);height:auto;line-height:1;border:none;font-size:13px}
.nav .cta a:hover{background:var(--primary-dark);border:none}
.mobile-toggle{display:none;background:transparent;border:0;font-size:24px;cursor:pointer;color:var(--dark)}
@media(max-width:992px){
  .mobile-toggle{display:block}
  .nav{position:absolute;top:84px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;border-bottom:1px solid var(--gray-100);box-shadow:var(--shadow);display:none}
  .nav.open{display:flex}
  .nav::before{display:none}
  .nav>li>a{height:auto;line-height:1;padding:14px 24px;border-radius:0}
  .submenu{position:static;transform:none;opacity:1;visibility:visible;box-shadow:none;border:0;border-bottom:1px solid var(--gray-100);border-radius:0;padding:0;background:var(--light)}
  .has-submenu:hover .submenu,.has-submenu:focus-within .submenu{transform:none}
  .submenu a{padding:10px 38px}
  .nav .cta{margin:12px 24px}
}