*{
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif, ;
    box-sizing: border-box; 
    text-decoration: none;
}
body{
    
    background-color: #A9BCC3;
}
header{
    width: 100%;
    position: fixed;
    background-color: #A9BCC3;
    z-index: 3;
}
.container{
   position: relative;
   padding: 0px 50px 0px 50px;
}


img, video{
    cursor: pointer;
}

.arrow h4{
    font-size: 16px;
    font-weight: bold;
    color: #1B3943;
    
    display: inline-block;
}
.arrow{
    position: absolute;
    right: 10vh;
    top: 95vh;
    opacity: 0.5;
}
.arrow svg{
    animation: arrow 2s ease infinite;
}
@keyframes arrow {
    0%{transform: translateY(0px);}
    50%{transform: translateY(10px);}
    100%{transform: translateY(0px);}
}
.tieude1{
    width: 100%;

}
.tieude1 h1{
    color: #1B3943;
    font-weight: bolder;
    font-size: 150px;
    text-transform: uppercase;
   /* margin-left: -20px; */

    letter-spacing: 5px;
}
.nd{
    margin-top: 180px;

}
.nd h2{
    color: #1B3943;
    font-weight: bold;
    opacity: 0.9;
    font-size: 40px;
    margin-bottom: 20px;
    
}

.nd1{
    display: flex  ;
    justify-content: center;
    margin-top: 10px;
    margin-bottom: 50px;   
}
.nd1-1{
    position: relative;
    width: 300px;
    height: 400px;
    box-shadow: 5 0 0px rgba(0, 0, 0, 0);
}
.nd1-2{
    width: 300px;
    height: 400px;
    position: absolute;
    left:0;
    bottom: -10px;
    z-index: 1;
    background: linear-gradient(180deg, rgba(255,255,255,0) 0%, rgba(27,57,67,1) 100%);
    border-radius: 10px;
    cursor: pointer;
}

.nd1-1 {

    transform: perspective(1px) translateZ(0);
    box-shadow: 10px 10px 10px rgba(0, 0, 0, 0.2);
    
    transition-duration: 0.3s;
    
    transition-property: transform;
    
    transition-timing-function: ease-out;
}

.nd1-1:hover{
    transform: translateY(-15px);
}

.nd1-2{
    width: 300px;
    height: 400px;
    position: absolute;
    left:0;
    bottom: -10px;
    z-index: 1;
    background: linear-gradient(180deg, rgba(255,255,255,0) 0%, rgba(27,57,67,1) 100%);
    border-radius: 10px;
}

.nd1 h3{
    color: #A9BCC3;
    font-weight: bold;
    opacity: 0.9;
    position: absolute;
    font-size: 40px;
    z-index: 2;
    left: 16px;
    bottom: 0;
}


.nd1 h4{
    background-color: rgb(169, 188, 195, 0.2);
    width: 20px;
    height: 20px;
    display: flex;
    color: #A9BCC3;
    font-weight: bold;
    opacity: 0.9;
    position: absolute;
    font-size: 30px;
    z-index: 2;
    right: 16px;
    bottom: 0;
    border-radius: 20%;
}

.anh{
    width: 300px;
    height: 400px;
    object-fit: cover;
    border-radius: 10px;

}

.anh2{
    margin-top: 10px;
    width: 500px;
    height: 300px;
    object-fit: cover;
    border-radius: 10px;
    transform: perspective(1px) translateZ(0);
    box-shadow: 10px 10px 10px rgba(0, 0, 0, 0.2);
    
    transition-duration: 0.3s;
    
    transition-property: transform;
    
    transition-timing-function: ease-out;
}

.anh2:hover{
    transform: translateY(-15px);
}

h3{
    color: #1B3943;
    font-weight: bold;
    opacity: 0.8;
    
    font-size: 30px;
    
    
}

.nd2{
    display: flex  ;
    justify-content: center;
    margin-top: 10px;
    margin-bottom: 50px;   
}
.nd2-1{
    position: relative;
    width: 300px;
    height: 400px;
    overflow: hidden;
    border-radius: 10px;
    box-shadow: 10px 10px 10px rgba(0, 0, 0, 0.2);
    background-color: #111111;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    transition-duration: 0.3s;
    
    transition-property: transform;
    
    transition-timing-function: ease-out;
  }
  .nd2-1:hover:hover{
    transform: translateY(-15px);
  }

.nd2-1 .anh{
    width: 100%;
    
    object-fit: cover;
}
#pic2-1{
    object-position: 0% 0%;
}
#pic2-2{
    object-position: 0% 22%;
}
#pic2-3{
    object-position: 0% 47%;
}
#pic2-4{
    object-position: 0% 58%;
}

#hide1{
    width: 100vw;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    position: absolute;
    z-index: 4;
    height: 260vh
}
#hide2{
    width: 100vw;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    position: absolute;
    z-index: 4;
    height: 260vh
}
#hide3{
    width: 100vw;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    position: absolute;
    z-index: 4;
    height: 260vh
}
#hide4{
    width: 100vw;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    position: absolute;
    z-index: 4;
    height: 260vh
}

.unhide{
    display: flex  !important;
    justify-content: center;
}

#hide1 .anh{
    width: 50vw;
    object-fit: cover;
    object-position: 0% 0%;
    height: 167vh;
    margin-top: 60vh
}
#hide2 .anh{
    width: 50vw;
    object-fit: cover;
    object-position: 0% 22%;
    height: 167vh;
    margin-top: 60vh
}
#hide3 .anh{
    width: 50vw;
    object-fit: cover;
    object-position: 0% 47%;
    height: 167vh;
    margin-top: 60vh
}
#hide4 .anh{
    width: 50vw;
    object-fit: cover;
    object-position: 0% 58%;
    height: 167vh;
    margin-top: 60vh
}

#vidhide1{
    width: 100vw;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    position: absolute;
    z-index: 4;
    height: 260vh
}
#vidhide1 video{
    width: fit-content;
    object-fit: contain;
    height: 60vh;
    margin-top: 190vh;
}
#vidhide2{
    width: 100vw;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    position: absolute;
    z-index: 4;
    height: 260vh
}
#vidhide2 video{
    width: fit-content;
    object-fit: contain;
    height: 60vh;
    margin-top: 190vh;
    
}

.nd3{
    display: flex;
    justify-content: center;
    flex-direction: column;
    margin-bottom: 50px;
}

button{
    text-transform: uppercase;
    color: white;
    background-color: #1B3943;
    font-weight: normal;
    font-size: 40px;
    border: 4px white solid;
    border-radius: 80px;
    margin-right: 5px;
    width: 206px;
    height: 70px;
    display: flex;
    justify-content: space-evenly;
    align-items: center;
    margin-top: 0px;
    box-shadow: 10px 10px 10px rgba(0, 0, 0, 0.6);
    
}

button:active{ 
    transform: translateX(10px,10px);
    box-shadow: 10px 10px 10px rgba(0, 0, 0, 0);  
}


.nut1{
    z-index: 2;
    text-decoration: none;
    padding-right: 20px;
    padding-bottom: 20px;
    display: flex;
    justify-content: flex-end;
    overflow: hidden;
}