*{
    margin: 0;
    padding: 0;
    outline: 0;
}
html,body{
    height: 100%;
}
body {
    font-family: Helvetica, Arial, sans-serif;
    color: #333;
    background: #f0f3f8;
}

.cb{
    clear: both;
}

#header{
    height: calc(100% - 80px);
    min-height: 600px;
    max-height: 1500px;
    width: 100%;
    background: #3e82f7;
    position: relative;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

#headerBackground{
    position: absolute;
    z-index: 0;
}

h1.title{
    color: #fff;
    margin: 0 auto;
    text-align: center;
    font-size: 50px;
    font-weight: 200;
    letter-spacing: 2px;
    padding-top: 20px;
    position: relative;
    z-index: 1;
}
h2.des{
    color: rgba(255,255,255,.7);
    margin: 0 auto;
    text-align: center;
    font-size: 20px;
    font-weight: 200;
    letter-spacing: 1px;
    position: relative;
    z-index: 1;
}

.button_d{
    display: inline-block;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    height: 50px;
    width: 260px;
    text-align: center;
    line-height: 50px;
    font-size: 22px;
    font-weight: 200;
    letter-spacing: 1px;
    vertical-align: middle;
    cursor: pointer;
}
.button_d:active{
    opacity: .5;
}

.button_d.bt1{
    border:3px solid #fff;
    line-height: 44px;
    color: #fff;
    background-color: #3e82f7;
}
.button_d.bt1:hover{
    background-color: #5a96fe;
}

.button_d.bt2{
    color: #fff;
    background-color: rgb(33, 103, 223);
}
.button_d.bt2:hover{
    background-color:#105cde ;
}

.actions{
    width: 580px;
    margin: 10px auto;
    position: relative;
    z-index: 1;
}

.actions .signUp{
    float: left;
}

.actions .signIn{
    float: right;
}
.actions .create{
    float: left;
}
.actions .convert{
    float: right;
}
.video{
    width: 640px;
    height: 360px;
    /*background: #cccccc;*/
    margin: 25px auto;
    position: relative;
    z-index: 1;
}

.video .playButton{
    width: 128px;
    height: 128px;
    position: absolute;
    left: 50%;
    margin-left: -64px;
    top: 50%;
    margin-top: -64px;
    cursor: pointer;
    background: url(../images/homepage.png) 0 0 no-repeat;
}
.video .playButton:hover{
    background: url("../images/homepage.png")0 -128px no-repeat;
}

#howTo{
    padding-bottom: 130px;
    padding-top: 20px;
}

#howTo .title{
    margin: 0 auto;
    text-align: center;
    font-size: 32px;
    font-weight: 200;
    letter-spacing: 2px;
    line-height: 60px;
}

.imageTable{
    width: 936px;
    margin: 0 auto;
}
.imageTable .case{
    width: 312px;
    float: left;
}

.case .image{
    width: 225px;
    height: 225px;
    margin: 50px auto;
}
.collect .image{
    background: url(../images/homepage.png) 0  -256px no-repeat;
}
.organize .image{
    background: url(../images/homepage.png) 0  -479px no-repeat;
}
.share .image{
    background: url(../images/homepage.png) 0  -703px no-repeat;
}
.case .des{
    text-align: center;
    font-size: 26px;
    font-weight: 200;
    width: 250px;
    color: #6c6e70;
    margin: 0 auto;
}

#footer{
    height: 65px;
    line-height: 65px;
    background-color: #e4e4e4;
    text-align: center;
    color: #aaaaaa;
    text-shadow: 0 1px 1px rgba(255,255,255,8);
}

.ui.modal.createModel{
    width: 600px;
    margin-left: -300px;
    border-radius: 0;
}

.ui.modal.createModel .title{
    padding: 20px 15px;
    font-size: 16px;
    border-bottom: 1px solid #eee;
}
.ui.modal.createModel .content{
    background-color: transparent;
    border-bottom: 1px solid #eee;
    padding: 1em;
}
.ui.modal.createModel .actions{
    width: auto;
    padding: 5px 20px ;
}


/*fall down ball*/

.fallDownBall{
    position: absolute;
    z-index: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}


@-webkit-keyframes fallDown {
    from {
        -webkit-transform: translateY(0px);
    }
    to {
        -webkit-transform: translateY(1500px);
    }
}
@keyframes fallDown {
    from {
        transform: translateY(0px);
    }
    to {
        transform: translateY(1500px);
    }
}

div.c1{
    width: 100%;
    height: 100%;
    border-radius: 100%;
    background-color: #4789fd;
}
div.c2{
    width: 100%;
    height: 100%;
    border-radius: 100%;
    background-color: #3279f5;
}

.layer1{
    display: block;
}
.layer1 .b1{
    width: 60px;
    height: 60px;
    position: absolute;
    -webkit-animation: fallDown 96s linear infinite;
    animation: fallDown 96s linear infinite;
}
.layer1 .b2{
    width: 60px;
    height: 60px;
    position: absolute;
    top: -60px;
    left: 30%;
    -webkit-animation: fallDown 156s linear infinite;
    animation: fallDown 156s linear infinite;
}

.layer1 .b3{
    width: 300px;
    height: 300px;
    position: absolute;
    top: -60px;
    left: 60%;
    -webkit-animation: fallDown 86s linear infinite;
    animation: fallDown 86s linear infinite;
}
.layer1 .b4{
    width: 150px;
    height: 150px;
    position: absolute;
    top: -100px;
    left: 80%;
    -webkit-animation: fallDown 206s linear infinite;
    animation: fallDown 206s linear infinite;
}

.layer1 .b5{
    width: 150px;
    height: 150px;
    position: absolute;
    top: -20px;
    left: 10%;
    -webkit-animation: fallDown 56s linear infinite;
    animation: fallDown 56s linear infinite;
}

.layer2 .b1{
    width: 150px;
    height: 150px;
    position: absolute;
    top: -20px;
    left: 20%;
    margin-top: -500px;
    -webkit-animation: fallDown 106s linear infinite;
    animation: fallDown 106s linear infinite;
}

.layer2 .b2{
    width: 60px;
    height: 60px;
    position: absolute;
    top: -20px;
    left: 40%;
    margin-top: -300px;
    -webkit-animation: fallDown 106s linear infinite;
    animation: fallDown 106s linear infinite;
}

.layer2 .b3{
    width: 60px;
    height: 60px;
    position: absolute;
    top: -20px;
    left: 5%;
    margin-top: -300px;
    -webkit-animation: fallDown 166s linear infinite;
    animation: fallDown 166s linear infinite;
}

.layer2 .b4{
    width: 150px;
    height: 150px;
    position: absolute;
    top: -20px;
    left: 2%;
    margin-top: -300px;
    -webkit-animation: fallDown 116s linear infinite;
    animation: fallDown 116s linear infinite;
}

.layer2 .b5{
    width: 150px;
    height: 150px;
    position: absolute;
    top: -20px;
    left: 20%;
    margin-top: -300px;
    -webkit-animation: fallDown 86s linear infinite;
    animation: fallDown 86s linear infinite;
}