@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;
}

body {
    background-color: #e2faff;
    font-family: "Apercu",-apple-system,BlinkMacSystemFont,"Segoe UI","Roboto","Ubuntu","Cantarell","Fira Sans","Droid Sans","Helvetica Neue",sans-serif;
}



/* 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 */
.sign-up-sect {
    position: relative;
    width: 1000px;
    height: 560px;
    margin: 13% auto 0;
}

.lady {
    position: absolute;
    width: 450px;
    height: 450px;
    border-radius: 50%;
    border: 10px solid #fff;
    box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.5);
    overflow: hidden;
}

.lady img {
    display: block;
    margin: auto;
    height: 100%;
}

.sign-up h1 {
    font-size: 26px;
    font-weight: 700;
    line-height: 39px;
    display: block;
}

.sign-up {
    position: absolute;
    left: 58%;
}

.sign-up input, .sign-up button {
    outline: navy;
    width: 450px;
    height: 40px;
}

.sign-up button {
    cursor: pointer;
    margin-bottom: 20px;
    background-color: rgb(52, 9, 227);
    color: white;
    border: none;
    border-radius: 5px;
}

.sign-up button:hover {
    filter: brightness(1.2);
}

.sign-up form {
    margin-top: 5px;
    line-height: 35px;
}

.sign-up strong {
    font-weight: 700;
    font-size: 16px;
    margin-top: 10px;
    margin-bottom: 25px;
}

.sign-up span a {
    border: 1px solid black;
    padding: 15px 20px;
    margin-right: 10px;
    background-color: rgb(255, 255, 255);
}

.sign-up small > a{
    text-decoration: underline;
    color: rgb(58, 16, 229);
}

.sign-up small > a:hover {
    text-decoration: none;
}

.sign-up span a:hover {
    filter: brightness(0.9);
}

.sign-up small {
    line-height: 20px;
}

/* styling card components */
.lightblue {
    width: 100%;
    position: relative;
    background-color: #51c47f;
    height: 800px;

}

.card-title {
    position: absolute;
    top: 10%;
    left: 30.5%;
    color: white;
    text-align: center;
    width: 500px;
}

.card-title p {
    font-size: 16px;
    font-weight: 400;
    font-family: Suisse, Apercu, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
}

.card-title h2 {
    font-family: Apercu, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
    font-size: 44px;
    font-weight: 700;
}

.card {
    width: 230px;
    height: 350px;
    padding: 1em;
    background: #07182e;
    position: relative;
    display: flex;
    flex-direction: column;
    place-content: center;
    place-items: center;
    overflow: hidden;
    border-radius: 20px;
    box-shadow: 0 0 1em 0.5em rgba(7, 24, 46, 0.3);
}

.card h2 {
    z-index: 1;
    margin-bottom: 15px;
    color: white;
    width: 200px;
    text-align: center;
}

.card ul {
    width: 100%;
    z-index: 1;
    color: white;
    font-size: 13px;
    line-height: 20px;

}

.card ul li {
    margin-bottom: 20px;
}

/* ::before and ::after normally use to decorate the element */
.card::before{
    content: '';
    position: absolute;
    width: 100px;
    background-image: linear-gradient(180deg, rgb(0, 183, 255), rgb(255,48,255));       /* 创建渐变色 */
    height: 130%;
    animation: rotBGimg 3s linear infinite;
    transition: all 0.2s linear;
}

/* define animation, how gradient bgc should rotate */
@keyframes rotBGimg {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }

}

.card::after {
    content: "";
    position: absolute;
    background: #07182e;
    inset: 5px;
    border-radius: 15px;
}

.card-components {
    position: absolute;
    left: 17%;
    top: 27%;
    display: flex;
    justify-content: space-between;
    width: 900px;
}

.catalog {
    position: absolute;
    bottom: 150px;
    left: 42.5%;
}

.catalog a {
    color: black;
    background-color: rgb(255, 211, 0);
    border: 1px solid black;
    padding: 10px 10px;
    border-radius: 5px;
    font-size: 16px;
    font-weight: 700;
}

.catalog a:hover {
    filter: brightness(0.9);
}

/* styling quiz */
.yellow {
    width: 100%;
    position: relative;
    height: 550px;
    background-color: rgba(255, 211, 0);
}

.not-sure {
    position: absolute;
    width: 400px;
    left: 15%;
    top: 27%;
    
}

.not-sure h1 {
    margin-bottom: 15px;
    font-size: 44px;
    font-weight: 700;
}

.not-sure p {
    margin-bottom: 35px;
    line-height: 27px;
    font-size: 16px;
    font-weight: 400;
}

.not-sure a {
    font-size: 16px;
    font-weight: 700;
    border: 2px solid transparent;
    padding: 8px 13px;
    color: white;
    background-color: rgb(58, 16, 229);
    border-radius: 5px;
}

.not-sure a:hover {
    filter: brightness(1.2);
}

.window {
    position: absolute;
    left: 65%;
    top: 20%;
}

/* styling stories */
.rice-color {
    position: relative;
    width: 100%;
    height: 700px;
    background-color: #FFF0E5;;
}

.stories {
    position: absolute;
    left: 10%;
    top: 10%;
    

}

.stories h2 {
    font-size: 44px;
    font-weight: 700;
    margin-bottom: 10px;

}

.story-desc {
    width: 1150px;
    display: flex;
    justify-content: space-between;
}

.story-desc span a {
    color: rgb(52, 9, 227);
}

.story-desc span a:hover {
    border: 2px solid transparent;
    padding: 10px 15px;
    background-color: rgb(227, 227, 227);
    border-radius: 5px;
    transition: 0.3s;
}


.fourimg {
    width: 1150px;
    position: absolute;
    top: 25%;
    margin-top: 30px;
    justify-content: space-between;
    display: flex;
    left: 10%;
}

.imgs {
    width: 250px;
    height: 250px;
    border: 1px solid black;
}

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

.imgs figcaption h3 {
    color: rgb(16, 22, 47);
    margin-top: 10px;
    line-height: 25px;
    margin-bottom: 5px;

}

.imgs figcaption p {
    font-size: 14px;
    font-weight: 400;
    color: rgb(16, 22, 47);
}

.imgs figcaption h3:hover, .imgs figcaption p:hover {
    color: rgb(52, 9, 227);
}

/* styling join sth big */
.dark-blue {
    background-color: rgb(52, 9, 227);
    width: 100%;
    position: relative;
    height: 1500px;
}

.join {
    display: flex;
    position: absolute;
    width: 1100px;
    top: 10%;
    justify-content: space-between;
    left: 10%;
}

.join span {
    color: white;
}


.black {
    position: absolute;
    background-color: rgb(16, 22, 47);
    width: 100%;
    top: 23%;
    height: 600px;
}

.lvl-up {
    position: absolute;
    top: 25%;
    left: 10%;
    color: white;
    width: 1100px;
    display: flex;
    justify-content: space-around;
}

.team-skill {
    width: 500px;
    
}

.team-skill h1 {
    font-size: 44px;
    margin-bottom: 30px;
    font-weight: 700;
}

.team-skill a {
    color: black;
    background-color: rgb(255, 211, 0);
    border: 1px solid black;
    padding: 10px 25px;
    border-radius: 5px;
}

.team-skill a:hover {
    filter: brightness(0.8);
}

.startfree {
    position: absolute;
    top: 75%;
    left: 15%;
    width: 1000px;
    justify-content: space-between;
    display: flex;
}

.free h2 {
    font-weight: 700;
    font-size: 44px;
}

.free {
    color: white;
    width: 400px;
}

.free p {
    margin-top: 10px;
    margin-bottom: 40px;
    line-height: 25px;
}

.free a {
    color: black;
    background-color: rgb(255, 211, 0);
    border: 1px solid transparent;
    padding: 10px 25px;
    border-radius: 5px;
}

.free a:hover {
    filter: brightness(0.8);
}

/* styling contact */
.contact {
    width: 100%;
    position: relative;
    height: 270px;

}

.contact-link {
    position: absolute;
    left: 0;
    top: 0;
    width: 350px;
    height: 350px;
}

.contact-link a{
    display: flex;
    width: 100%;
    height: 100%;
    border: 1px solid rgb(53, 148, 53);
    background-color: rgb(53, 148, 53);    
    align-items: center;
    justify-content: center;
    color: #F4f9ff;

}

.contact-link a:hover {
    background-color: rgb(208, 159, 69);
    border: 1px solid rgb(208, 159, 69);
    transition-duration: 0.5s;
}

.contact-des {
    position: absolute;
    top: 55%;
    left: 28%;
    justify-content: space-between;
    width: 950px;
    display: flex;
    color: rgb(144, 45, 45);
}

/* styling footer */
.footer-blue {
    position: relative; 
    background-color: #2677c7;
    width: 1074px;
    height: 770px;
    margin: 80px 0 0 350px;
}

.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;
}