/* ------------------------------------------
 * IT书包
 * 网址：www.itshubao.com
 * 整理：yinq<3331653644@qq.com> 
 -------------------------------------------- */
body {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-wrap: wrap;
        flex-wrap: wrap;
    -webkit-box-pack: center;
        -ms-flex-pack: center;
            justify-content: center;
    -webkit-box-align: center;
        -ms-flex-align: center;
            align-items: center;
    -ms-flex-line-pack: center;
        align-content: center;
    height: 100vh;
    font: 16px Roboto, sans-serif;
    background: #f9f9f9;
}

a {
    text-decoration: none;
    color: inherit;
}

.c-icon {
    width:  36px;
    height: 36px;
    fill: currentColor;
    -webkit-transition: .2s;
    transition: .2s;
}

.c-link--facebook:hover  { color: #3b5998 }
.c-link--twitter:hover   { color: #55acee }
.c-link--google:hover    { color: #dd4b39 }
.c-link--pinterest:hover { color: #bd081c }
.c-link--instagram:hover { color: #833ab4 }
.c-link--snapchat:hover  { color: #fbe00f }
.c-link--facebook:hover::after  { background: #3b5998 }
.c-link--twitter:hover::after   { background: #55acee }
.c-link--google:hover::after    { background: #dd4b39 }
.c-link--pinterest:hover::after { background: #bd081c }
.c-link--instagram:hover::after { background: #833ab4 }
.c-link--snapchat:hover::after  { background: #fbe00f }

.c-link {
    position: relative;
    color: #bbb;
}

.c-link:not(:last-of-type) {
    margin-right: 15px;
}

.c-tooltip::before,
.c-tooltip::after {
    display: block;
    position: absolute;
    left: 50%;
    -webkit-transform: translate(-50%, -10px);
            transform: translate(-50%, -10px);
    opacity: 0;
    -webkit-transition: .2s;
    transition: .2s;
}

.c-tooltip::before {
    content: '';
    bottom: calc(100% + 2px);
    border: solid 5px transparent;
    border-top-color: currentColor;
}

.c-tooltip::after {
    content: attr(aria-label);
    bottom: calc(100% + 12px);
    padding: .61em .93em;
    font-size: .875rem;
    color: white;
    border-radius: 3px;
}

.c-tooltip:hover::before,
.c-tooltip:hover::after {
    opacity: 1;
    -webkit-transform: translate(-50%);
            transform: translate(-50%);
}

.pens-link-container {
    -ms-flex-preferred-size: 100%;
        flex-basis: 100%;
    font-size: .9rem;
    text-align: center;
}

.pens-link {
    margin-bottom: 0;
    background: white;
    box-shadow: 0 4px 18px rgba(0, 0, 0, .1);
    border: none;
}