* {margin: 0; padding: 0;}


/*general styles*/

#cuboid {
	width: 300px; margin: 0 auto;
	/*this also makes #cuboid a container for absolutely positioned descendants*/
	perspective: 1000px;
}
#cuboid form {
	/*counter translate*/
	transform: translateZ(-20px);
	/*propogate 3d space for children*/
	transform-style: preserve-3d;
	/*prevent height collapse as children are absolutely positioned*/
	height: 40px;
	/*for smooth animations*/
	transition: all 0.35s;
}

/*faces*/
.cuboid-text {
	/*each face will be 40px high*/
	line-height: 40px; height: 40px;
	color:#fff;
	background: hsl(0, 0%, 0%);
}
.loader {
	background: hsl(120, 40%, 30%);
	animation: phase 1s infinite;
}
/*Lets create a pulsating animation for the loader face*/
@keyframes phase {
	50% {background: hsl(120, 70%, 30%);}
}
#email {
	background: white; outline: ; border: 0 none;
	font: inherit; text-align: left; color: hsl(0, 0%, 0%);
	display: block; width: 100%; padding: 0 10px;
	box-sizing: border-box;
}
#submit {display: none;}

.submit-icon, .reset-icon {
	position: absolute; top: 0; right: 0;
	color: rgba(0, 0, 0, 0.25);
	line-height: 40px; padding: 0 10px;
	/*smooth transitions when user activates input and types something*/
	transition: all 0.5s;
	/*to make the icons feel like buttons*/
	cursor: pointer;
}
/*.active = when the user is typing something*/
.submit-icon.active {color: hsl(0, 0%, 0%);}
.reset-icon {color: rgba(255, 255, 255, 0.25); font-size: 14px;}

#cuboid div {position: absolute; top: 0; left: 0; width: 100%;}
/*3D transforms. Each face will be rotated in multiples of -90deg and moved 20px(half of their 40px height) out*/
#cuboid div:nth-child(1) {transform: rotateX(0deg) translateZ(20px);}
#cuboid div:nth-child(2) {transform: rotateX(-90deg) translateZ(20px);}
#cuboid div:nth-child(3) {transform: rotateX(-180deg) translateZ(20px);}
#cuboid div:nth-child(4) {transform: rotateX(-270deg) translateZ(20px);}

/*the form will have 4 states/classes(default+3) for rotation*/
#cuboid form:hover, 
#cuboid form.ready {transform: translateZ(-20px) rotateX(90deg);}
#cuboid form.loading {transform: translateZ(-20px) rotateX(180deg);}
#cuboid form.complete {transform: translateZ(-20px) rotateX(270deg);}