/*! HTML5 Boilerplate v4.3.0 | MIT License | http://h5bp.com/ */



/* ==========================================================================
   Base styles: opinionated defaults
   ========================================================================== */

html,
button,
input,
select,
textarea {
    color: #222;
}

html {
    font-size: 1em;
    line-height: 1.4;
}



::-moz-selection {
    background: #b3d4fc;
    text-shadow: none;
}

::selection {
    background: #b3d4fc;
    text-shadow: none;
}

/*
 * A better looking default horizontal rule
 */

hr {
    display: block;
    height: 1px;
    border: 0;
    border-top: 1px solid #ccc;
    margin: 1em 0;
    padding: 0;
}

/*
 * Remove the gap between images, videos, audio and canvas and the bottom of
 * their containers: h5bp.com/i/440
 */

audio,
canvas,
img,
video {
    vertical-align: middle;
}

/*
 * Remove default fieldset styles.
 */

fieldset {
    border: 0;
    margin: 0;
    padding: 0;
}

/*
 * Allow only vertical resizing of textareas.
 */

textarea {
    resize: vertical;
}

/* ==========================================================================
   Browse Happy prompt
   ========================================================================== */



/* ==========================================================================
   Author's custom styles
   ========================================================================== */
body{
    opacity: 1;
    background-image: radial-gradient(#444cf7 1px, #def1ff2b 1px);
    background-size: 64px 64px;
}

H2{
    font-family: Arial, Helvetica, sans-serif;!important;
    /*font-weight: bold;*/
    color: white;
}

H5{
    font-family: Arial, Helvetica, sans-serif;!important;
    color: white;
}

.container{
    margin: auto;
    width: 100%;
    box-sizing: border-box;
}

.row{
    margin: auto;
    max-width: min(1320px,95%);
    box-sizing: border-box;
    display: flex;
    flex-flow: row wrap;
}

.col-sm-all {
    margin: 20px auto;
    padding: 20px;
    width: min(140px,40%);
    height:140px;
    text-align: center;
    box-shadow: 0 18px 43px rgba(74, 130, 183, .15);
    border-radius: 18px;
}


.col-sm-web {
    background-image: url("../img/bg-android.jpg");
    margin: 20px auto;
    padding: 20px;
    width: min(140px,40%);
    height:140px;
    text-align: center;
    box-shadow: 0 18px 43px rgba(74, 130, 183, .15);
    border-radius: 18px;
    transition: transform 1s ease;
}







.col-sm-mac {
    background-image: url("../img/bg-macos.jpg");
    margin: 20px auto;
    padding: 20px;
    width: min(140px,40%);
    height:140px;
    text-align: center;
    box-shadow: 0 18px 43px rgba(74, 130, 183, .15);
    border-radius: 18px;
}

.col-sm-win {
    background-image: url("../img/bg-win.jpg");
    margin: 20px auto;
    padding: 20px;
    width: min(140px,40%);
    height:140px;
    text-align: center;
    box-shadow: 0 18px 43px rgba(74, 130, 183, .15);
    border-radius: 18px;
}
.col-sm-and {
    background-image: url("../img/bg-android.jpg");
    margin: 20px auto;
    padding: 20px;
    width: min(140px,40%);
    height:140px;
    text-align: center;
    box-shadow: 0 18px 43px rgba(74, 130, 183, .15);
    border-radius: 18px;
}
.col-sm-lin {
    background-image: url("../img/bg-linux.jpg");
    margin: 20px auto;
    padding: 20px;
    width: min(140px,40%);
    height:140px;
    text-align: center;
    box-shadow: 0 18px 43px rgba(74, 130, 183, .15);
    border-radius: 18px;
}

a {
    font-family: Arial, Helvetica, sans-serif;!important;
    text-decoration: none;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}


#header {
    padding: 20px 0;
    display: flex;
    top: 0;
    left: 0;
    width: 100%;
}

#header li {
    display: inline-block;
    line-height: 60px;
}

#header ul {
    display: block;
    list-style-type: disc;
    margin-block-start: 1em;
    margin-block-end: 1em;
    margin-inline-start: 0px;
    margin-inline-end: 0px;
    padding-inline-start: 40px;
    unicode-bidi: isolate;
}

#header .main {
    display: flex;
    justify-content: space-between;
    flex-direction: row;
    height: 60px;
    margin: 0 auto;
    width: 950px;
}

#header .main a {
    line-height: 60px;
    font-size: 14px;
    margin-right: 18px;
}

#header .main > ul > li > a {
    color: #FFFFFF;
    padding: 0 15px;
    display: block;
    height: 100%;
}

#header .main > ul > li > a > .is-active {
    border-bottom: white 3px solid;
    padding-bottom: 8px;
}

#header-logo {
    font-size: 24px;
    line-height: 60px;

}
#header-logo span {
    color: #000000;
}

/*进入动画*/
.enter {
    margin-top: 120px;
    text-align: center;
    /* 贝塞尔曲线动画 */
    animation: enterenter 3.8s infinite cubic-bezier(0.250, 0.460, 0.450, 0.940) both;
}

@keyframes enterenter {
    0% {
        /* 加上文字间距 */
        letter-spacing: 1em;
        /* Z轴变换 */
        transform: translateZ(300px);
        /* filter: blur(); 像素模糊效果 */
        filter: blur(12px);
        /* 透明度也要改变 */
        opacity: 0;
    }

    100% {
        transform: translateZ(12px);
        filter: blur(0);
        opacity: 1;
    }
}

/*消散动画*/
.leave {
    text-align: center;
    animation: leaveleave 3.8s infinite cubic-bezier(0.250, 0.460, 0.450, 0.940) both;
}

@keyframes leaveleave {
    0% {
        transform: translateZ(0);
        filter: blur(0.01);
    }

    100% {
        letter-spacing: 1em;
        transform: translateZ(300px);
        filter: blur(12px) opacity(0%);
    }
}






/* ==========================================================================
   Helper classes
   ========================================================================== */

/*
 * Image replacement
 */

.ir {
    background-color: transparent;
    border: 0;
    overflow: hidden;
    /* IE 6/7 fallback */
    *text-indent: -9999px;
}

.ir:before {
    content: "";
    display: block;
    width: 0;
    height: 150%;
}

/*
 * Hide from both screenreaders and browsers: h5bp.com/u
 */

.hidden {
    display: none !important;
    visibility: hidden;
}

/*
 * Hide only visually, but have it available for screenreaders: h5bp.com/v
 */

.visuallyhidden {
    border: 0;
    clip: rect(0 0 0 0);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    width: 1px;
}

/*
 * Extends the .visuallyhidden class to allow the element to be focusable
 * when navigated to via the keyboard: h5bp.com/p
 */

.visuallyhidden.focusable:active,
.visuallyhidden.focusable:focus {
    clip: auto;
    height: auto;
    margin: 0;
    overflow: visible;
    position: static;
    width: auto;
}

/*
 * Hide visually and from screenreaders, but maintain layout
 */

.invisible {
    visibility: hidden;
}

/*
 * Clearfix: contain floats
 *
 * For modern browsers
 * 1. The space content is one way to avoid an Opera bug when the
 *    `contenteditable` attribute is included anywhere else in the document.
 *    Otherwise it causes space to appear at the top and bottom of elements
 *    that receive the `clearfix` class.
 * 2. The use of `table` rather than `block` is only necessary if using
 *    `:before` to contain the top-margins of child elements.
 */

.clearfix:before,
.clearfix:after {
    content: " "; /* 1 */
    display: table; /* 2 */
}

.clearfix:after {
    clear: both;
}

/*
 * For IE 6/7 only
 * Include this rule to trigger hasLayout and contain floats.
 */

.clearfix {
    *zoom: 1;
}

/* ==========================================================================
   EXAMPLE Media Queries for Responsive Design.
   These examples override the primary ('mobile first') styles.
   Modify as content requires.
   ========================================================================== */

@media only screen and (min-width: 35em) {
    /* Style adjustments for viewports that meet the condition */
}

@media print,
       (-o-min-device-pixel-ratio: 5/4),
       (-webkit-min-device-pixel-ratio: 1.25),
       (min-resolution: 120dpi) {
    /* Style adjustments for high resolution devices */
}

/* ==========================================================================
   Print styles.
   Inlined to avoid required HTTP connection: h5bp.com/r
   ========================================================================== */

@media print {
    * {
        background: transparent !important;
        color: #000 !important; /* Black prints faster: h5bp.com/s */
        box-shadow: none !important;
        text-shadow: none !important;
    }

    a,
    a:visited {
        text-decoration: underline;
    }

    a[href]:after {
        content: " (" attr(href) ")";
    }

    abbr[title]:after {
        content: " (" attr(title) ")";
    }

    /*
     * Don't show links for images, or javascript/internal links
     */

    .ir a:after,
    a[href^="javascript:"]:after,
    a[href^="#"]:after {
        content: "";
    }

    pre,
    blockquote {
        border: 1px solid #999;
        page-break-inside: avoid;
    }

    thead {
        display: table-header-group; /* h5bp.com/t */
    }

    tr,
    img {
        page-break-inside: avoid;
    }

    img {
        max-width: 100% !important;
    }

    @page {
        margin: 0.5cm;
    }

    p,
    h2,
    h3 {
        orphans: 3;
        widows: 3;
    }

    h2,
    h3 {
        page-break-after: avoid;
    }
}


.card{
    width: 140px;
    height: 140px;
    position: relative;
    transform-style: preserve-3d;
    transform: translateZ(-140px);
    transition: transform 150ms cubic-bezier(0.390, 0.575, 0.565, 1.000);
    cursor: pointer;
}

.card > div{
    position: absolute;
    width: 140px;
    height: 140px;
    transition: all 150ms cubic-bezier(0.390, 0.575, 0.565, 1.000);
}

.front{
    transform: rotateY(0deg) translateZ(90px);

}

.right{
    opacity: 0;
    transform: rotateY(140deg) translateY(140px) translateZ(-180px);

}

.card img{
    transition: transform 1s  ease ;
}
.card:hover img {
    transition: transform 1s  ease ;
    transform: rotate(3600deg) scale(1.2);
    }

.card:hover .front{
    transform: translateZ(-60px) rotateY( -180deg);
    opacity: 0;
}

.card:hover .right{
    transform: rotateY( 0deg) translateY(100px)  translateZ(100px) ;
    opacity: 1;
}

button{
    position: absolute;
    right: 6%;
    bottom: 160%;
    width: 120px;
    height: 38px;
    border: none;
    color: inherit;
    font-size: 16px;
    letter-spacing: -.25px;
    padding: 5px;
    border-radius: 36px;
    background-image: linear-gradient(130deg, rgb(255, 255, 255) 40%, rgb(255, 255, 255) 100%);
    background-size: 100% 120%;
    background-position: right;
    cursor: pointer;
    box-shadow: 8px 5px 13px rgba(34,34,34,.08);
    transform: scale(0) skewX(20deg);
    transition: all 150ms cubic-bezier(0.390, 0.575, 0.565, 1.000);
}

.card:hover button{
    transform: scale(1) skewY(0);
}

.card:not(:hover) button{
    opacity: 0;
}

button:hover{
    background-position: left;
}