.cf-topnav{position:sticky;top:0;z-index:2147483646;display:flex;align-items:center;gap:2px;
  height:44px;padding:0 14px;box-sizing:border-box;
  background:#101322;border-bottom:1px solid rgba(255,255,255,.09);
  font:13.5px/1 -apple-system,BlinkMacSystemFont,"PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;}
.cf-topnav a{display:flex;align-items:center;gap:6px;padding:7px 12px;border-radius:8px;
  color:rgba(255,255,255,.78);text-decoration:none;white-space:nowrap;
  transition:background .15s,color .15s;}
.cf-topnav a:hover{background:rgba(255,255,255,.10);color:#fff;}
.cf-topnav .cf-brand{color:#fff;font-weight:700;margin-right:10px;}
.cf-topnav .cf-mark{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;color:#818cf8;font-weight:800;letter-spacing:-.05em;}
.cf-topnav a.cur{color:#fff;background:rgba(129,140,248,.20);box-shadow:inset 0 -2px 0 #818cf8;}
/* VitePress 自己的固定导航栏让出顶部菜单栏的高度（仅 /ai/ 页面命中该选择器） */
.VPNav{top:44px !important;}
@media (max-width:560px){
  .cf-topnav{padding:0 8px;}
  .cf-topnav .cf-brand{margin-right:2px;}
  .cf-topnav .cf-brand .cf-name{display:none;}
  .cf-topnav a{padding:7px 9px;}
  .cf-topnav a span{display:none;}
}