/* 导航条悬浮菜单动画样式 */

/* 导航条固定定位，悬浮在页面顶部 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1030;
  width: 100%;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: box-shadow 0.3s ease;
  background-color: rgba(0, 0, 0, .4) !important;
  height: 72px;
}
.navbar-expand-lg .navbar-toggler  {
  float: right;
}
.navbar-brand {
  float: left;
  display: block;
  width: 120px;
  height: 28px;
  overflow: hidden;
  display: block;
  font-size: 1rem;
  padding: 0;
  margin-right: 40px;
}
.navbar-brand img {
  width: 120px;
  height: 28px;
}
.navbar-nav .nav-item {
  margin-right: 1rem  !important;
}
.navbar-brand.sjht {
  margin-right: 0;
  width: 82px;
  height: 44px;
}
.navbar-brand.sjht img {
  width: 82px;
  height: 44px;
  display: block;
}

.navbar-nav {
  font-size: 14px;
  
}
/* 滚动时增强阴影效果 */
.navbar.scrolled {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* 确保导航条容器不占用额外空间 */
#navbar-container {
  position: relative;
  z-index: 1030;
}
#navbarNav a {
 color: #fff;
}

@media screen and (max-width: 991.98px) {
  .navbar .container-fluid {
    display: block;
    width: 100%;
    padding: 0 15px;
  }
  .navbar-brand {
    margin-top: 10px;
    float: left;
  }
  .navbar-right {
    float: left;
  }
  .navbar-right .navbar-brand {
    margin-top: 0;
  }
  .navbar-toggler {
    margin-top: 7px;
  }
}

/* 大屏幕时保持原有布局 */
@media screen and  (min-width: 992px) {
  .navbar-collapse {
    position: static;
    box-shadow: none;
    border-radius: 0;
    max-height: none !important;
    opacity: 1 !important;
    transform: none !important;
    display: flex !important;
  }
  .navbar-nav .nav-item {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* 导航链接悬停效果 */
.navbar-nav .nav-link {
  transition: color 0.2s ease, background-color 0.2s ease;
  padding: 0.25rem 1.5rem;
  text-align: center;
  border-radius: 4px;
  position: relative;
}
.navbar-nav .nav-link.active {
  background-color: rgba(255, 255, 255, .1);
}
/* rgba(90, 188, 46, 1); */
.navbar-nav .nav-link.active::after {
  content: '';
  display: block;
  width: 100%;
  height: 2px;
  background-color: rgba(90, 188, 46, 1);
  position: absolute;
  border-radius: 1px;
  bottom: -10px;
  left: 0;
}
.navbar-nav .nav-link:hover {
  background-color: rgba(255, 255, 255, .2);
}

/* 汉堡按钮样式 - 去掉边框 */
.navbar-toggler {
  border: none !important;
  outline: none !important;
  padding: 0.25rem 0.5rem;
  background: transparent;
  cursor: pointer;
  position: relative;
  width: 30px;
  height: 30px;
}

.navbar-toggler:focus {
  box-shadow: none !important;
  outline: none !important;
}

/* 合并的图标样式 - 使用元素本身和伪元素实现汉堡和 X 图标 */
.navbar-toggler-icon {
  display: inline-block;
  width: 20px;
  height: 18px;
  position: relative;
  transition: all 0.3s ease;
  /* 元素本身作为中间线 */
  background-color: #333;
  border-radius: 1px;
  height: 2px;
  transform: translateY(-50%);
}

/* 顶部线 - 使用 ::before */
.navbar-toggler-icon::before {
  content: '';
  display: block;
  width: 100%;
  height: 2px;
  background-color: #fff;
  border-radius: 1px;
  position: absolute;
  left: 0;
  top: -12px;
  transition: all 0.3s ease;
}

/* 底部线 - 使用 ::after */
.navbar-toggler-icon::after {
  content: '';
  display: block;
  width: 100%;
  height: 2px;
  background-color: #fff;
  border-radius: 1px;
  position: absolute;
  left: 0;
  bottom: 0;
  transition: all 0.3s ease;
}

/* 菜单展开时，转换为 X 图标 */
.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon {
  background-color: transparent;
  transform: translateY(-50%);
}

.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon::before {
  top: 2px;
  transform: translateY(-50%) rotate(45deg);
}

.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon::after {
  bottom: auto;
  top: 100%;
  transform: translateY(-50%) rotate(-45deg);
}

/* 菜单收起时，恢复汉堡图标 */
.navbar-toggler[aria-expanded="false"] .navbar-toggler-icon {
  background-color: #fff;
  transform: translateY(-50%);
}

.navbar-toggler[aria-expanded="false"] .navbar-toggler-icon::before {
  top: -6px;
  background-color: #fff;
  transform: translateY(0) rotate(0deg);
}

.navbar-toggler[aria-expanded="false"] .navbar-toggler-icon::after {
  bottom: -6px;
  background-color: #fff;
  transform: translateY(0) rotate(0deg);
}
/* 悬浮菜单容器 - 仅在小屏幕生效 */
@media (max-width: 991.98px) {
  .navbar-collapse {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: rgba(33, 33, 32, 0.8);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 1031;
    border-radius: 0 0 8px 8px;
    overflow: hidden;
    max-height: 0;
    opacity: 0;
    transform: translateY(-10px);
    transition: max-height 0.3s ease-out, opacity 0.3s ease-out, transform 0.3s ease-out;
    display: block !important;
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
  }
  .navbar-nav .nav-link.active::after{
    height: 0;
  }
  /* 菜单显示状态 */
  .navbar-collapse.show,
  .navbar-collapse.collapsing {
    max-height: 500px;
    opacity: 1;
    transform: translateY(0);
  }
  
  /* 隐藏状态 */
  .navbar-collapse:not(.show):not(.collapsing) {
    max-height: 0;
    opacity: 0;
    transform: translateY(-10px);
  }
  .navbar-nav .nav-item {
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    margin-right: 0 !important;
  }

  .navbar-collapse.show .nav-item {
    opacity: 1;
    transform: translateY(0);
  }

  /* 为每个导航项添加延迟动画 */
  .navbar-collapse.show .nav-item:nth-child(1) {
    transition-delay: 0.05s;
  }

  .navbar-collapse.show .nav-item:nth-child(2) {
    transition-delay: 0.1s;
  }

  .navbar-collapse.show .nav-item:nth-child(3) {
    transition-delay: 0.15s;
  }

  .navbar-collapse.show .nav-item:nth-child(4) {
    transition-delay: 0.2s;
  }

  .navbar-collapse.show .nav-item:nth-child(5) {
    transition-delay: 0.25s;
  }

  .show .navbar-nav .nav-link {
    padding: 1rem 2rem;
    font-weight: bold;

  }
  .show .navbar-nav .nav-link:hover {
    background: none !important;
  }
  .show .navbar-nav .nav-link.active {
    color: rgba(90, 188, 46, 1) !important;
    background: none;
  }
}