/* Header override for better default readability (applies on desktop)
   This file intentionally uses high-specificity rules to override other bundled CSS.
*/
/* 确保 header 容器本身也有背景色 */
.header {
  background: rgba(30, 41, 59, 0.85) !important;
}

.header .navbar,
.header.navbar {
  /* 深蓝灰色背景，与大多数 logo 不冲突且提供良好对比度 */
  background: rgba(30, 41, 59, 0.85) !important;
  border-bottom: 1px solid rgba(255,255,255,0.08) !important;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.22);
}

/* 覆盖滚动时的白色背景，保持统一的深蓝灰色 */
.page-on-scroll .header,
.page-on-scroll .header .navbar {
  background: rgba(30, 41, 59, 0.85) !important;
  border-bottom-color: rgba(255,255,255,0.08) !important;
}

.header .nav-item-child {
  /* 改回纯白色 #FFFFFF */
  color: #FFFFFF !important;
}

.header .nav li.active .nav-item-child,
.header .nav-item-child:hover,
.header .nav-item-child:focus {
  color: #17bed2 !important; /* accent */
  background: rgba(255,255,255,0.02) !important;
}

/* Ensure toggle icon and logo contrast */
.header .navbar-toggle .toggle-icon,
.header .navbar-toggle .toggle-icon:before,
.header .navbar-toggle .toggle-icon:after {
  background: #ffffff !important;
}

/* Mobile: keep existing white background behavior for collapsed menu */
@media (max-width: 991px) {
  .header {
    background: #fff !important;
  }
  .header .nav-item-child {
    color: #FFFFFF !important;
  }
  .header .navbar-toggle .toggle-icon,
  .header .navbar-toggle .toggle-icon:before,
  .header .navbar-toggle .toggle-icon:after {
    background: #515769 !important;
  }
}