/*

 * Style tweaks
 * --------------------------------------------------
 */
html,
body {
  overflow-x: hidden; /* Prevent scroll on narrow devices */
  font-family: -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

body{
  padding-top: 58px;
  text-align:left;
}

a{
    color: #17a2b8;
}
a:hover{
	color:#808080;
}
footer {
    padding-top: 50px;
    padding-bottom: 50px;
    margin-top: 100px;
    color: #99979c;
    text-align: left;
    background-color: #2a2730;
}

footer .footer-links{
	padding-left: 0;
    margin-bottom: 20px;
}

footer .footer-links li{
	display:inline-block;
	margin:5px;
}

footer .footer-links a{
	color:#fff;
}
footer .qrcode{
	float:right;
	height:120px;
	
}

.navbar-brand {
  padding: 0;
}
.navbar-brand img{
  height:50px;
  width:50px;	
  margin:-5px;
}

.masthead {
	position: relative;
    padding: 80px 0;
    color: #d9f9fe;
    text-align: center;
    text-shadow: 0 1px 0 rgba(0,0,0,.1);
    background-color: #17a2b8;
    background-image: -webkit-gradient(linear,left top,left bottom,from(#17a2b8),to(#18b2c8));
    background-image: -webkit-linear-gradient(top,#17a2b8 0,#18b2c8 100%);
    background-image: -o-linear-gradient(top,#17a2b8 0,#18b2c8 100%);
    background-image: linear-gradient(to bottom,#17a2b8 0,#18b2c8 100%);
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#17a2b8', endColorstr='#18b2c8', GradientType=0);
    background-repeat: repeat-x;
}

.masthead .lead{
	margin:0 auto;	
	width:80%;
	color:#d9f9fe;
	font-size:32px;
}

.masthead .btn-qr{
	margin:20px;
    color: #17a2b8;
    text-shadow: none;
    background-color: #fff;
    border-color: #fff;
    padding: 10px 20px;
    letter-spacing: 3px	
}
.masthead .btn-qr:hover{
	color:#d9f9fe;
    background-color: #17a2b8;
}

.big-logo img{
	height:200px;
}

.feature {
	padding:50px 0;
}
.feature h2.title{
    margin-bottom: 5px;
    font-size: 30px;
    font-weight: 400;
    color: #333;
}


.articles .thumbnail{
    display: block;
    margin-left: auto;
    margin-right: auto;
    height:260px;
    text-align: center;
    margin-bottom: 30px;
    border-radius: 0;
    padding: 4px;
    line-height: 1.42857143;
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 4px;
    -webkit-transition: border .2s ease-in-out;
    -o-transition: border .2s ease-in-out;
    transition: border .2s ease-in-out;
}

.articles .thumbnail .caption{
	padding: 5px;
}


.articles .thumbnail img{
    max-width: 100%;
    height: auto;
}

.articles .thumbnail .time{
	font-size:14px;
	color: #666;
	margin: 0px 10px;
	text-align:right;
}


.jumbotron{
	margin:30px 0px;
	
}

/*
 * fractions and irrationals 
 * --------------------------------------------------
 */

ul.fraction{
	list-style: none;
   	padding-inline-start: 2px;
   	text-align:center;
   	display:inline-block;
   	font-size: 20px; 
    line-height: 22px;
}
ul.fraction li:first-child{
	border-bottom: 2px solid;
	height:24px;
}
.fraction_sign{
    margin: 8px 0px;
    line-height: 42px;
    font-size: 30px;
}

.irrational{
	border-top: 1px solid;
   	margin-left: -1px;
}
/*
 * 24 points 
 * --------------------------------------------------
 */

#numbers{
	padding:10px;
	font-size:40px;
	width:200px;
	min-height:80px;
}
#numbers span{
	padding: 0 10px;
}

#digital-panel .btn{
	min-width: 85%;
    font-size: 30px;
    min-height: 40px;
    margin: 2px;
    line-height: 30px;
}
/*
 *
 * new
 */
 
#labels .btn{
	margin:4px;	
}

#field .blank{
	text-decoration: underline;
	color:red;
	margin:0 1px;
}

#field {
	font-size:20px;
}

#field .btn{
	margin:2px 3px;
}
#field .digital-panel .btn{
	min-height: 37px;
    min-width: 80px;
    font-size: 26px;
    line-height: 30px;
    padding: 1px 3px;
}


/*
 * Off Canvas
 * --------------------------------------------------
 */
@media screen and (max-width: 767px) {
  .row-offcanvas {
    position: relative;
    -webkit-transition: all .25s ease-out;
         -o-transition: all .25s ease-out;
            transition: all .25s ease-out;
  }

  .row-offcanvas-right {
    right: 0;
  }

  .row-offcanvas-left {
    left: 0;
  }

  .row-offcanvas-right
  .sidebar-offcanvas {
    right: -100%; /* 12 columns */
  }

  .row-offcanvas-right.active
  .sidebar-offcanvas {
    right: -50%; /* 6 columns */
  }

  .row-offcanvas-left
  .sidebar-offcanvas {
    left: -100%; /* 12 columns */
  }

  .row-offcanvas-left.active
  .sidebar-offcanvas {
    left: -50%; /* 6 columns */
  }

  .row-offcanvas-right.active {
    right: 50%; /* 6 columns */
  }

  .row-offcanvas-left.active {
    left: 50%; /* 6 columns */
  }

  .sidebar-offcanvas {
    position: absolute;
    top: 0;
    width: 50%; /* 6 columns */
  }
}