#head_top {
  border: transparent;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  
}



.navbar_al {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 5%;
  background: rgba(0, 255, 123, 0.082);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(15px);
  box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
}

.nav_left {
  display: flex;
  align-items: center;
}

.nav_logo {
  display: flex;
  align-items: center;
  margin-right: 30px;
}

.main_nav {
  display: flex;
  list-style: none;
}

.main_nav>li {
  margin-right: 20px;
  position: relative;
}

.main_nav a {
  text-decoration: none;
  color: #ffffff;
  position: relative;
  transition: color 0.3s;
  display: block;
  margin-top: 10px;
}

.main_nav a:hover {
  color: #9bd3f8;
}

.nav_right {
  display: flex;
  align-items: center;
  list-style: none;
}

.nav_right>li {
  margin-left: 20px;
  position: relative;
}

.nav_right a {
  text-decoration: none;
  color: #ffffff;
  font-weight: 500;
  transition: color 0.3s;
  display: block;
  margin-top: 10px;
}

.nav_right a:hover {
  color: #9bd3f8;
}

.dropdown_menu {
  position: absolute;
  top: 100%;
  left: 0;
  background-color: #fff;
  min-width: 180px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  border-radius: 5px;
  padding: 10px 0;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  transform: translateY(10px);
}

.dropdown_content_container {
  padding: 5px 0;
}

.dropdown_menu li {
  list-style: none;
}

.dropdown_menu a {
  padding: 8px 20px;
  color: #555;
  display: block;
  transition: all 0.2s;
}

.dropdown_menu a:hover {
  background-color: #f5f5f5;
  color: #3498db;
  padding-left: 25px;
}

.main_nav>li:hover .dropdown_menu,
.nav_right>li:hover .dropdown_menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

@media (max-width: 768px) {
  .navbar_al {
    flex-direction: column;
    padding: 15px;
  }

  .nav_left,
  .main_nav {
    width: 100%;
    justify-content: center;
    margin-bottom: 15px;
  }

  .nav_logo {
    margin-right: 15px;
  }

  .nav_right {
    width: 100%;
    justify-content: center;
  }

  .main_nav>li,
  .nav_right>li {
    margin: 0 10px;
  }
}

.nav_li_check {
  border-bottom: 1px solid #fff;
}

.introduce_three {
  width: 700px;
  height: 80px;
  display: flex;
  text-align: center;
  margin: auto;
}

.introduce_three_class {
  margin: auto;
  width: 200px;
  height: 190px;
  position: relative;
  top: -30px;
  border-radius: 8px;
  background: rgba(77, 255, 255, 0.3);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(174, 214, 241, 0.3);
}

.introduce_three_font {
  font-size: 20px;
  padding-top: 5px;
  color: #ffffff;
}

.fixed-tag {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 1000;
  background: transparent;
  color: rgb(0, 225, 255);
  padding: 10px 10px;
  border-radius: 4px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.fixed-tag:hover {
  color: #BBFFFF;
}