@import url('https://fonts.googleapis.com/css?family=Poppins:400,500,600,700&display=swap');

* {                     /*reset the default styles of HTML elements*/
    padding: 0;
    margin: 0;
    text-decoration: none;
    list-style: none;
    box-sizing: border-box;     /* if set the width and height to 100%, the element will fill its parent container exactly without overflowing due to padding or border.  */
}

body {
    font-family: Roboto;
}

/* styling nav bar */
nav{
    position: fixed;
    top: 0;
    z-index: 2;
    font-family: 'Poppins', sans-serif;
    display: flex;
    height: 95px;
    width: 100%;
    background-color: transparent;
    align-items: center;
    justify-content: space-between;
    padding: 0 0 0 50px;
    flex-wrap: wrap;
    transition: background-color 0.2s ease-in-out;
}

nav.scrolled {
    background-color: #253177;

}  

.logo.scrolled {
    color: #fff;
}

nav ul li a.scrolled  {
    color: #f2f2f2;
}   


  nav .logo{
    color: rgb(16, 22, 47);
    transition: color 0.2s ease-in-out;
    font-size: 35px;
    font-weight: 600;   

  }
  nav ul{
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    position: absolute;
    right: 0;
    top: 30%;
  }

  nav ul li{
    margin: 0 30px;
    position: relative;
  }
  
  .search-form input[type="text"] {   /*attribute selector, using attribute to style, attribute = "value" */
      padding: 5px;                   /*为指定的attribute加上css*/
      border-radius: 5px;             /*exp: input[type="text"] targets all <input> elements that have a type attribute with a value of text.*/
      border: none;
      margin-right: 10px;
      outline: none;  /* Remove the default blue outline */
      margin-top: 5px;
  }
    
  .search-form button[type="submit"] {
      background-color: #4CAF50;
      color: white;    
      border: none;
      padding: 5px 10px;
      border-radius: 5px;
      cursor: pointer;
      transition: background-color 0.3s ease;
  }
  nav ul li a{
    color: rgb(16, 22, 47);
    font-size: 18px;
    font-weight: 500;
  }


  nav .menu-btn i{
    color: #fff;   
    font-size: 22px;
    cursor: pointer;
    display: none;
  }
  
  input[type="checkbox"]{
    display: none;
  }

.layer {
    width: 70px;
    height: 70px;
    transition: 0.3s;
    margin-left: 10px;
}

.layer i{
    position: absolute;
    top: 0;
    left: 0;
    width: 40%;
    height: 45%;
    border: 1px solid var(--c);
    border-radius: 6px;
    transition: 0.3s;
    display: flex;
    justify-content: center;
    align-items: center;
}

nav .text { 
    position: absolute;
    bottom: 0;
    opacity: 0;
    width: 100%;
    left: -30%;
    text-align: center;
    color: var(--c);        /* call var() to a customization --c */
    transition: 0.3s;
}

nav ul a:hover .text {
    opacity: 1;
}


nav li a:hover .layer {
    transform: rotate(-35deg) skew(20deg);
}

nav li a:hover .layer i:nth-child(1) {
    opacity: 0.2;
    transform: translate(0,0);
}

nav li a:hover .layer i:nth-child(2) {
    opacity: 0.4;
    transform: translate(5px,-5px);
}

nav li a:hover .layer i:nth-child(3) {
    opacity: 0.6;
    transform: translate(10px,-10px);
}

nav li a:hover .layer i:nth-child(4) {
    opacity: 0.8;
    transform: translate(15px,-15px);
}

nav li a:hover .layer i:nth-child(5) {
    opacity: 1.0;
    transform: translate(20px,-20px);
}

/* customize --c */
nav li:nth-child(1) .layer i, li:nth-child(1) .text {
    --c: #12b7f5;
}

nav li:nth-child(2) .layer i, li:nth-child(2) .text {
    --c: #2aae67;
}


nav li:nth-child(3) .layer i, li:nth-child(3) .text {
    --c: #e79115;
}


nav li:nth-child(4) .layer i, li:nth-child(4) .text {
    --c: #2075fd;
    
}


nav li:nth-child(5) .layer i, li:nth-child(5) .text {
    --c: #2d8dc5;
}

nav li:nth-child(7) .layer i, li:nth-child(7) .text {
    --c: rgb(198, 56, 56);
}


/* styling main body */
.intro {
    width: 100%;
    position: relative;
    height: 750px;
    background-image: linear-gradient(to right top, #051937, #004d7a, #008793, #00bf72, #a8eb12);
}

.video-container {
    width: 350px;
    height: 350px;
    border: 10px solid rgb(96, 215, 110);
    box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.5);
    border-radius: 50%;
    overflow: hidden;
    position: absolute;
    left: 60%;
    top: 25%;
}
  
.video-container video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.words {
    position: absolute;
    top: 25%;
    left: 10%;
    width: 500px;
    height: 450px;
    line-height: 1.5;
}

.words h1 {
    color: #fff;
}

.words p {
    position: absolute;
    top: 40%;
    color: rgb(31, 23, 23);
}

.words span {
    color: #00bf72;
}

.words button {
    position: absolute;
    top: 70%;
    color: #fff;
    border: 2px solid transparent;
    width: 120px;
    height: 40px;
    padding-bottom: 2px;
    font-size: 13px;
    text-align: center;
    border-radius: 20px;
    background-color: #4CAF50; 
    box-shadow: 0 0 6px rgb(0 0 0 / 50%);
}

.words button:hover, .words a:hover {
    cursor: pointer;
    filter: brightness(1.2);
}

.ctas {
    position: absolute;
    top: 70%;
    color: #fff;
    border: 2px solid transparent;
    width: 120px;
    height: 40px;
    padding-top: 5px;
    font-size: 15px;
    text-align: center;
    border-radius: 20px;
    background-color: rgb(104, 52, 156); 
    box-shadow: 0 0 6px rgb(0 0 0 / 50%);
    left: 30%;
}

/* styling team members */
.lightgray {
    width: 100%;
    height: 2200px;
    position: relative;
}

.member1 {
    position: absolute;
    background-color: rgb(249, 48, 48);
    width: 100%;
    height: 550px;
}

.avatar {
    position: absolute;
    top: 15%;
    left: 7%;
    width: 350px;
    height: 350px;
    border: 10px solid white;
    border-radius: 50%;
    overflow: hidden;
}

.avatar img {
    width: 100%;
    height: 100%;
}

.avadesc {
    position: absolute;
    width: 800px;
    left: 40%;
    top: 20%;
    height: 300px;
    color: white;
}

.avadesc h1 {
    margin-bottom: 10px;
}

.avadesc p {
    line-height: 1.5;
    margin-bottom: 65px;
}

.member2 {
    position: absolute;
    background-color: rgb(183, 150, 150);
    width: 100%;
    height: 550px;
    top: 25%;
}


.member3 {
    position: absolute;
    background-color: #808080;
    width: 100%;
    height: 550px;
    top: 50%;
}

.member4 {
    position: absolute;
    background: lightblue;
    width: 100%;
    height: 550px;
    top: 75%;

}


/* styling founded */
.wrap {
    width: 100%;
    height: 800px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-image: linear-gradient(to bottom, #b8b8b8, #8dadca, #00abc2, #00a487, #0b931c);
}

.card {
    width: 440px;
    height: 250px;
    position: relative;
    top: -50px;
}

.history {
    position: absolute;
    top: -50%;
    left: 2%;
}

.rolebg:hover, .role:hover {
    cursor: pointer;
}

.rolebg {
    width: 380px;
    height: 250px;
    border-radius: 20px;
    border: 1px solid transparent;
    transform-origin: bottom;
    transition: 2s;
}

.rolebg img {
    width: 100%;
    height: 100%;
}

.role {
    width: 250px;
    height: 200px;
    position: absolute;
    bottom: 0;
    left: 15%;
    transform-origin: bottom;
    transition: 2s;
}

.role img {
    width: 100%;
    height: 100%;

}

.content {
    width: 440px;
    padding: 10px;
    color: black;
    position: absolute;
    bottom: -90px;
    opacity: 0;
    line-height: 1.5;
    transition: 2s;
}

.content h1 {
    font-weight: 200;
    margin-top: 0;
    margin-bottom: 0;
}

.content p {
    font-weight: 200;
    font-size: 14px;
}

.card:hover .rolebg {
    transform: perspective(1000px) rotateX(30deg) skewX(-20deg);
}

.card:hover .role {
    transform: scale(1.3);
}

.card:hover .content {
    opacity: 1;
    transform: translateY(120px);
}


/* styling vision */
.lightgreen {
    background-image: linear-gradient(to bottom, #ffffff, #d2e3f4, #90cddc, #58b7a9, #579a5f);
    position: relative;
    width: 100%;
    height: 1200px;

}

.col {
    position: absolute;
    width: 100%;
    height: 400px;
}


.vision-pic {
    width: 300px;
    height: 300px;
    position: absolute;
    left: 5%;
    top: 15%;

}

.vision-pic img {
    width: 100%;
    height: 100%;
}

.vision-content {
    width: 700px;
    height: 250px;
    position: absolute;
    left: 34%;
    top: 23%;
    line-height: 1.5;
}

.col2 {
    position: absolute;
    width: 100%;
    height: 400px;
    top: 33%;
}

.col2 .vision-pic {
    width: 300px;
    height: 300px;
    position: absolute;
    left: 70%;
    top: 15%;
}

.col2 .vision-content {
    width: 700px;
    height: 250px;
    position: absolute;
    left: 15%;
    top: 23%;
    line-height: 1.5;
}

.col3 {
    position: absolute;
    width: 100%;
    height: 400px;
    bottom: 0;
}

.col3 .vision-pic {
    width: 300px;
    height: 300px;
    position: absolute;
    left: 5%;
    top: 12%;
}

.col3 .vision-content {
    width: 700px;
    height: 250px;
    position: absolute;
    left: 32%;
    top: 22%;
    line-height: 1.5;
}

.vision-content h1 {
    margin-bottom: 20px;
    font-weight: 400;
    font-size: 44px;
}



/* styling partnerships & collaboration */
.green {
    width: 100%;
    height: 800px;
    position: relative;
}


.p-c {
    width: 50%;
    height: 800px;
    position: absolute;
}

.center-pic {
    width: 400px;
    height: 400px;
    position: absolute;
    left: 36%;
    top: 20%;
    z-index: 1;
}

.center-pic img {
    width: 100%;
    height: 100%;
    
}


.p-c-content {
    background-image: linear-gradient(to right top, #9ad7a5, #7dcfb7, #6dc5c4, #6fb9ca, #7cacc7, #81aeca, #87b1ce, #8cb3d1, #89c6e1, #87d9ed, #89ecf5, #93fef7);
    width: 50%;
    height: 800px;
    position: absolute;
    left: 50%;
}

.partner-text {
    position: absolute;
    width: 500px;
    height: 550px;    
    left: 8%;
    /* background-color: red; */
    top: 15%;
}

.partner-text p {
    margin-bottom: 70px;
    line-height: 25px;
}

.collab-text {
    position: absolute;
    width: 500px;
    left: 25%;
    top: 15%;
    line-height: 1.5;
    height: 550px;
    /* background-color: red; */
}

.collab-text p {
    line-height: 25px;
    margin-bottom: 100px;
}


.discover {
    position: absolute;
    bottom: 170px;
    left: 30%;
}

.discover {
    position: absolute;
    left: 25%;
    background-image: linear-gradient(to right, #FFC371, #FF5F6D);
    color: #fff;
    font-size: 16px;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}
  
.discover:hover {
    transform: translateY(-2px);
    box-shadow: 0px 2px 10px rgba(255, 95, 109, 0.5);
}

.partner-text h1, .collab-text h1 {
    margin-bottom: 5px;
}


/* styling footer */
.footer-blue {
    position: relative; 
    background-image: linear-gradient(to right top, #051937, #004d7a, #008793, #00bf72, #a8eb12);
    width: 1074px;
    height: 770px;
    margin-left: 351px;
}

.gray {
    width: 300px;
    height: 300px;
    position: absolute;
    left: 0;
    top: 0;
    border: 1px solid rgb(225, 224, 224);
    background-color: lightgray;
    display: flex;
    justify-content: center;
    align-items: center;
}

.footer-details {
    width: 700px;
    position: absolute;
    font-size: 14px;
    height: 700px;
    left: 32%;
    color: white;
    top: 7%;
}

.footer-details > p {
    margin-bottom: 40px;
    line-height: 23px;
}

.contact-method {
    margin-bottom: 30px;
    width: 400px;
    display: flex;
    justify-content: space-between;
}

.contact-method a {
    display: inline-block;
    width: 40px;
    height: 40px;
    margin: 0 10px;
    background-color: #fff;
    border-radius: 50%;
    box-shadow: 0 0 6px rgba(0, 0, 0, 0.5);
    transition: all 0.3s ease-in-out;
}

.contact-method a:hover {
    transform: translateY(-5px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

.contact-method a:nth-child(1) {
    background-color: #3b5998;
}
  
.contact-method a:nth-child(2) {    
    background-color: #0077b5;
}

.contact-method a:nth-child(3) {
    background-color: #1da1f2;
}

.contact-method a:nth-child(4) {
    background-color: #e4405f;
}

.contact-method a i {
    line-height: 40px;
    display: flex;
    justify-content: center;
    text-align: center;

}

.footer-blue table {
    width: 700px;
    height: 400px;
    line-height: 30px;
}

.footer-details a {
    color:  white;
}

.footer-details table a:hover {
    text-decoration: none;
}

.footer-details a:active {
    color: darkblue;
}

.footer-details table a {
    text-decoration: underline;
}


.copyRight {
    position: absolute;
    width: 650px;
    bottom: 20px;
    display: flex;
    justify-content: space-between;

}

.privacy {
    cursor: pointer;
}