/* 顶部导航栏样式 */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  background-color: var(--background-color);
  z-index: 1000;
  display: flex;
  justify-content: center;
  transition: all 0.3s ease;
  font-size: 26px;
}

.header-container {
  width: 1400px;
  max-width: 1400px;
  height: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
}

/* Logo样式 */ 
.header-container .logo {
  display: flex;
  align-items: center;
  color: white;
  text-decoration: none;
}

.header-container .logo-icon {
  font-size: 36px;
  margin-right: 12px;
  color: #4fc3f7;
}

.header-container .logo-text {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 1px;
}

.header-container .logo-text span {
  color: #4fc3f7;
}

/* 导航菜单样式 */
.header-container .nav-menu {
  display: flex;
  height: 100%;
  list-style: none;
}

.header-container .nav-item {
  width: fit-content;
  height: 100%;
  position: relative;
  margin: 0 12px;
}

.header-container .nav-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  padding: 0 12px;
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  font-size: 20px;
  font-weight: 500;
  transition: all 0.3s ease;
  position: relative;
}

.header-container .nav-link:hover {
  color: white;
  background-color: var(--primary-color)
}

.header-container .nav-link i {
  margin-left: 8px;
  font-size: 14px;
  transition: transform 0.3s ease;
}

/* 二级菜单样式 */
.header-container .submenu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: unset;
  list-style: none;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
  border-radius: 0 0 8px 8px;
  /* overflow: hidden; */
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.4s ease;
}

.header-container .nav-item:hover > .submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.header-container .submenu-item {
  width: 100%;
}

.header-container .submenu-link {
  width: 100%;
  min-width: 93px;
  height: 80px;
  padding: 0 20px;
  color: white;
  text-decoration: none;
  font-size: 20px;
  transition: all 0.2s ease;
  background-color: rgba(0, 116, 173, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
}

.header-container .submenu-link:hover, .header-container .submenu-item:hover  {
  background-color: var(--primary-color);
  color: white;
}


.header-container .submenu-item.has-submenu {
  position: relative;
}

.header-container .submenu-3rd {
  position: absolute;
  top: 0;
  left: 100%;
  min-width: 140px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
  border-radius: 0 8px 8px 8px;
  background-color: rgba(0, 116, 173, 0.8);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.3s;
  z-index: 1001;
}

.header-container .submenu-item.has-submenu:hover > .submenu.submenu-3rd,
.header-container .submenu-item.has-submenu:focus > .submenu.submenu-3rd {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}