@media (prefers-reduced-motion: no-preference) {
  * {
    scroll-behavior: smooth;
  }
}
 
body{
  margin: 0;
  padding: 0;
  height: 100vh;
  background-color: #1B1D25;
  overflow: auto; 
}

body::-webkit-scrollbar {
display: none;
}

.background-video-container{
position:fixed;
top: 0;
left:0;
width: 100%;
height: 100%;
overflow: hidden;
z-index: -2;
}
.background-video-container video{
height: 120vh;
width: 100%;
object-fit: cover;
}


header{
  background-color: aliceblue;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 60px;
  margin: 20px 40px 0 40px;
  border-radius: 5px;
  position: fixed;
  width: 95%;
  top:0;
}

header span{
    color:rgb(223, 16, 116);
}

header div{
  margin-left: 20px;
}

.logo a{
  text-decoration: none;
  color: black;
  line-height: 2rem;
  font-family: Comic Sans MS, Comic Sans, cursive;
  font-size: 1.5rem;
}

header ul{
  margin-right: 20px;
  
}
.nav {
  display:flex;
  flex-direction: row;
  gap: 50px;
  overflow: hidden;
  box-sizing: border-box;
  align-items: center;
}

.nav a{
  text-decoration: none;
  color: black;
}

.nav a:hover{
  border-bottom: 2px solid rgb(227, 61, 19);
  color:rgb(223, 16, 116) ; 
}

.nav li{
  display: inline-flex;
}

.menu{
  display: none;
  border: 2px solid black;
  background: transparent;
  cursor: pointer;
  padding: 8px;
  border-radius: 5px;
  
}

.menu span {
  width: 25px;
  height: 3px;
  background: #ee55a2ad;
  display: block;
  margin: 5px 0;
}

.line{
  height:3px;
  width:20px;
  background-color: black;
  margin-bottom: 3px;
  
}

  
          main {
              margin: 120px 40px 0px 40px;
          }
  
          .dep {
              display: grid;
              justify-content:center;
              
          }
  
          .dep a {
              text-decoration: none;
          }
  
          .sem {
              background-color: #23252e;
              height: 9vh;
              width:30rem; 
              box-sizing: border-box;
              margin-top: 30px;
              border-radius: 5px;
              color: #c6cbdf;
              padding: 5px;
          }
  
          .sem p {
              text-align: center;
              
          }
  
          .sem span {
              font-size: 15px;
              font-weight: bold;
              color: aliceblue;
          }

          .sem:hover {
            border: 3px solid rgb(223, 16, 116);
          }
  
  
          footer {
              margin-top: 330px;
              background-color: rgb(22, 23, 30);
              height: 150px;
              color: rgb(156 163 175);
              text-align: center;
              padding-top: 20px;
          }
  
          footer hr {
              width: 95%;
          }
  
          footer a {
  
              color: rgb(156 163 175);
              text-decoration: none;
          }
  
          footer a:hover {
              color: #e5e7eb;
          }
  
  
          .footer {
              display: flex;
              flex-direction: row;
              flex-wrap: wrap;
              justify-content: space-between;
              align-items: center;
              margin: 20px 40px 0 40px;
              top: 60px;
          }
  
          .logo2 a {
              color: #e5e7eb;
              font-size: 2.5rem;
              line-height: 2rem;
              text-decoration: none;
              font-family: Montserrat, sans-serif;
  
          }
  
          .nav1 {
              display: flex;
              gap: 30px;
              overflow: hidden;
          }
  
          .nav1 a {
              text-decoration: none;
              color: rgb(156 163 175);
          }
  
          .nav1 li {
              display: block;
          }
  
          @media all and (max-width: 640px) {
  
            header{
              width: 90%;
              margin-left: 20px;
            }
          
           
            
            .nav{
              flex-direction: column;
               max-height: 0;
               background-color: aliceblue;
               min-width: 100%;
               position: absolute;
               top: 60px;
               left: 0;
               gap: 0px;
               margin-right: 20px;
           }
  
  .nav li{
    display:block;
    padding: 10px 0;
  
  }
  
  .nav.open {
    max-height: 300px;
  }
  
  ul{
    text-align: center;
  }
  
  .menu{
    display:block;
    position: absolute;
    right: 20px;
  }
  
  footer{
  height:380px;
  
  }
  .nav1{
  flex-direction: row;
  flex-wrap: wrap;
  }
  
  .sem{
    width: 100%; 
  }
  
  }