.gioithieu{
    width: 100%;
    display: flex;
    position: relative;
    top: 300px;
    height: 1500px;
}
.left-gioithieu{
    position: relative;
    top:-50px;
    width: 20%;
    height: 1600px;
    /* border-right: 3px solid rgb(77, 76, 76); */
    background-image: linear-gradient(60deg , #2dd0f9, #ffffff, #ffe2a8, #ffffff, #44aeff);
    padding-top: 80px;
}
#gt1
{   
    margin: 40px;
    margin-left: 200px;
    width: 700px;
    border-top-right-radius: 190px;
    border-top-left-radius: 190px;
}
.center-gioithieu{
    width: 100%;
    height: auto;
    position: relative;
    
}
#gioithieu {
    position: absolute;
    width: 100%;
    height: 100%;
    text-align: justify;
    padding: 50px 80px;
    font-size: 18px;
    line-height: 28px;
    text-align: left;
    margin-top: -40px;
   
}
#gioithieu h1{
    font-size: 27px;
    font-family:Arial, Helvetica, sans-serif;
    color: rgb(69, 69, 69);
    border-bottom: 1px solid   black;
    /* line-height: 90px; */
    width: 1100px;
    height: 50px;
    border: 3px rgb(210, 210, 210);
    border-style:  outset;
    border-radius: 10px;
    background-image: linear-gradient(to right bottom, #50bcff, #f5f5f5, #fb8eff, #ececec);
    background-size: 150% 200%;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.7); 
}
#gioithieu p{
    width: 1100px;
    padding: 30px;
    line-height: 43px;
    word-spacing: 2px;
    text-align: left;
}



.menu-gioithieu li{
    width: 100%;
    /* height: 60px; */
    line-height: 60px;
    font-size: 20px;
    font-weight: bold;
    font-family:sans-serif;
}
.menu-gioithieu li:hover{
    background-image: linear-gradient(to right bottom ,rgb(255, 41, 41), #28a9ffdf);
    color:#ffffff;
    transform: scale(1.07);
}
.menu-gioithieu li a{
    cursor: pointer;
    margin-left: 20px;
}
/* phần giới thiệu về cá nhân thành viên lí do chọn đề tài */

#muctieu{
    position: absolute;
    width: 100%;
    height: 100%;
    font-size: 18px;
    padding: 80px 70px;
    line-height: 40px;
}
#muctieu b{
    color: crimson;
}
#ykienkhac{
    position: absolute;
    width: 100%;
    height: 100%;
    font-size: 18px;
    padding: 80px 70px;
    line-height: 28px; 
}
#chinhsach{
    position: absolute;
    width: 100%;
    height: auto;
    font-size: 18px;
    padding: 80px 70px;
    line-height: 28px;
    
}
#nhanvien{
    position: absolute;
    width: 100%;
    height: auto;
    font-size: 18px;
    padding: 50px 70px;
    line-height: 28px;
}
#thanhvien {
    color: #ffffff;
    font-family: sans-serif;
    text-align: center;
    font-size: 40px;
    position: relative;
    top:-30px;
    left: 370px;  
    width: 300px;
    border-radius: 20px;
    height: 50px;
    padding: 10px;
    background-image: linear-gradient(45deg, #7bcfff, #cdc5c5, #ff5441, #ececec);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 1);
}
.detai
{   
    
    margin-left: 300px;
    text-align: center;
    width: 500px;
    height: 50px;
    padding:10px;
    margin-top: 180px;
    font-size: 30px;
    background-image: linear-gradient(to right bottom, #50bcff, #f5f5f5, #79ff82, #ececec);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.9);
}

.info{
    width: 100%;
    display: flex;
    justify-content: space-around;
}
.infoNv{
    margin-top: 20px;
}
.infoNv .avatar{
    width: 180px;
    height: 180px;
    position: relative;
}
.infoNv .avatar img{
    position: absolute;
    top: -20px;
    left: 20px;
    width: 100%;
    box-shadow: 1px 4px 6px rgba(66, 66, 66, 0.9);
    border-radius: 50%;
}

.infoNv .avatar img:hover{
    transform: scale(1.2);
    transition: 0.4s;
    border-radius: 10px;
}
.thongtinSv
{
    margin-top: 30px;
    line-height: 30px;
    padding: 30px;
    margin-left: -50px;
    text-align: center;
    width: 330px;
    height: 150px;
    background-image: linear-gradient(to right bottom, #50bcff, #f5f5f5, #fb8eff, #ececec);
    background-size: 150% 200%;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.7);

}
#chucnang
{   
    font-size: 30px;
    width: 330px;
    text-align: center;
    padding: 15px;
    height: 60px;
    border-radius: 10px;
    background-image: linear-gradient(to right bottom, #50bcff, #f5f5f5, #fb8eff, #ececec);
    background-size: 150% 200%;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.7); 
}
#ykienkhac h1
{
    border-radius: 10px;
    background-image: linear-gradient(to right bottom, #50bcff, #f5f5f5, #fb8eff, #ececec);
    background-size: 150% 200%;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.7); 
    width: 670px;
    height: 60px;
    padding: 15px;
}
#ykienkhac b
{
    color: rgb(255, 41, 41);
}
#chinhsach h1{
    border-radius: 10px;
    background-image: linear-gradient(to right bottom, #50bcff, #f5f5f5, #fb8eff, #ececec);
    background-size: 150% 200%;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.7); 
    width: 400px;
    height: 60px;
    padding: 15px;
}
#chinhsach b{
    color: rgb(255, 41, 41);
}

/* phần footer */
.footer

{   color: var(--pramiry-color) ;
    display: flex;
    width: 100%; 
    height: 330px;
    background-color: #000;
    position: relative;
    margin-top: 500px;
    background-image: url(https://media3.giphy.com/media/U3qYN8S0j3bpK/giphy.gif?cid=ecf05e47dagg2u0vvnuuj6emu9ba5o8jjqejq48tzxy8zy46&ep=v1_gifs_related&rid=giphy.gif&ct=g);
    justify-content: space-between;
}
.text-footer h1
{
    font-size: 15px;
    width: 180px;
    height: 60px;
}
.text-footer 
{   
    font-family: var(--pramiry-font-family);
    padding:30px 40px;
    line-height: 30px;
}
.text-footer a
{
text-align: left;
color: var(--pramiry-color);
font-size: 12.5px;

}
.text-footer .map
{
    margin-left: 100px;
}
.text-footer iframe
{
    position: relative;
    margin-top: -27px;
    width: 250px;
    height: 250px;
    border-radius: 50%;
}
/* cre thuộc sở hữu */
.end
{
    position: relative;
    right: 900px;
    margin-top: 300px;

}
.end p
{   flex-wrap: nowrap;
    color: #ffffff;
    font-family: var(--pramiry-font-family);
    font-size: 12px;
    letter-spacing: 2px;
    width: 410px;
    height: 20px;
}
/*  phần icon mạng xã hội */
.parent {
    position: relative;
    left: -10px;
    top:-10px;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.child {
    width: 50px;
    height: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
    transform-style: preserve-3d;
    transition: all 0.5s ease-in-out;
    border-radius: 50%;
    margin: 0 5px;
}

.child:hover {
    background-color: white;
    background-position: -100px 100px, -100px 100px;
    transform: rotate3d(0.5, 1, 0, 30deg);
    transform: perspective(180px) rotateX(60deg) translateY(2px);
    box-shadow: 0px 10px 10px rgb(1, 49, 182);
}

button {
    border: none;
    background-color: transparent;
    font-size: 20px;
}

.button:hover {
    width: inherit;
    height: inherit;
    display: flex;
    justify-content: center;
    align-items: center;
    transform: translate3d(0px, 0px, 15px) perspective(180px) rotateX(-35deg) translateY(2px);
    border-radius: 50%;
}