/* ========== 全站统一头部（与 mtyjx 首页一致） ========== */
.site-header{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:12px 20px;background:#fff;border-bottom:1px solid #E5E7EB;
  position:sticky;top:0;z-index:100;
}
.site-header .header-left{display:flex;align-items:center;gap:14px;min-width:0}
.site-header .logo{width:50px;height:50px;border-radius:12px;object-fit:cover;flex:none}
.site-header .site-title{font-size:19px;font-weight:bold;color:#1E293B;line-height:1.2}
.site-header .site-subtitle{font-size:12px;color:#999;margin-top:4px}
.site-header .header-right{display:flex;align-items:center;gap:10px}
.site-header .reading-stats{font-size:12px;color:#666}
.menu-btn{
  width:30px;height:30px;display:flex;flex-direction:column;
  justify-content:center;align-items:center;gap:4px;
  background:none;border:none;cursor:pointer;padding:0;flex:none;
}
.menu-btn span{width:20px;height:2px;background-color:#333;border-radius:1px;transition:all .3s}
/* 下拉菜单 */
.dropdown-menu{
  position:fixed;top:70px;right:20px;background:#fff;border-radius:8px;
  box-shadow:0 2px 10px rgba(0,0,0,.1);z-index:1000;
  display:none;flex-direction:column;min-width:140px;overflow:hidden;
}
.dropdown-menu.active{display:flex}
.dropdown-menu a{
  padding:10px 16px;text-decoration:none;color:#333;font-size:14px;
  transition:background-color .2s;
}
.dropdown-menu a:hover{background-color:#f5f5f5}