/* ==========================================================================
   Author's custom styles
   ========================================================================== */
/* Basic reset */
* {
	padding: 0;
	margin:0;
	box-sizing: border-box;
}
h1 {
  text-align:center;
  padding-top:50px;
}
/* Using box shadows to create 3D effects */
#calculator {
	
	width: 325px;
	height: auto;	
	margin: 3% auto;
	padding: 20px 20px 9px;	
	background: #6DC5DC;
	border-radius: 3px;
	box-shadow: 0px 4px #52BAD5, 0px 10px 15px rgba(0, 0, 0, 0.2);
	font: bold 14px Arial, sans-serif;
}

/* Top portion */
span.clear {
	float: left;
}

/* Inset shadow on the screen to create indent */
.screen {
	height: 40px;
	width: 212px;
	
	float: right;
	
	padding: 0 10px;
	
	background: rgba(0, 0, 0, 0.2);
	border-radius: 3px;
	box-shadow: inset 0px 4px rgba(0, 0, 0, 0.2);
	
	/* Typography */
	font-size: 17px;
	line-height: 40px;
	color: white;
	text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
	text-align: right;
	letter-spacing: 1px;
}

/* Clear floats */
.keys, .top {overflow: hidden;}

/* Applying same to the keys */
.keys span, span.clear {
	float: left;
	position: relative;
	top: 0;
	
	cursor: pointer;
	
	width: 66px;
	height: 36px;
	
	background: white;
	border-radius: 3px;
	box-shadow: 0px 4px rgba(0, 0, 0, 0.2);
	
	margin: 0 7px 11px 0;
	
	color: #888;
	line-height: 36px;
	text-align: center;
	
	/* prevent selection of text inside keys */
	user-select: none;
	
	/* Smoothing out hover and active states using css3 transitions */
	transition: all 0.2s ease;
}

/* Remove right margins from operator keys */
/* style different type of keys (operators/evaluate/clear) differently */
.keys span.operator {
	background: #FFF0F5;
	margin-right: 0;
}

.keys span.eval {
	background: #FFE8AA;
	box-shadow: 0px 4px #FED156;
}

.top span.clear {
	background: #EE836E;
	box-shadow: 0px 4px #E85C41;
	color: white;
}

/* Some hover effects */
.keys span:hover {
	background: #9c89f6;
	box-shadow: 0px 4px #6b54d3;
	color: white;
}

.keys span.eval:hover {
	background: #FED156;
	box-shadow: 0px 4px #FEBE12;
	color: #ffffff;
}
.top span.clear:hover {
	background: #E85C41;
	box-shadow: 0px 4px #DB3A1B;
	color: white;
}

/* Simulating "pressed" effect on active state of the keys by removing the box-shadow and moving the keys down a bit */
.keys span:active {
	box-shadow: 0px 0px;
	top: 4px;
}

.keys span.eval:active {
	box-shadow: 0px 0px;
	top: 4px;
}
.top span.clear:active {	
	box-shadow: 0px 0px;
	top: 4px;
}