/* 3D knihy */
.book {
	position: relative;
}

/* Barva učebnice */
.book .bk-front, .book .bk-left, .book .bk-back, .book .bk-front:after {
	background-color: #ECEFF1;
}

/* Přední strana */
.book .bk-cover {
	position: relative;
}

.book .bk-front {
	border-radius: 0 3px 3px 0;
    border: 1px solid rgba(0, 0, 0, .15);
}

/* Boční text */
.book .bk-left {
	border: 1px solid rgba(0, 0, 0, .15);
}

.book .bk-left .book-spine-text {
	color: black;
	font-size: 12px;
	padding-right: 10px;
	padding-left: 10px;
	width: 200px;
	height: 40px;
	opacity: .55;
	-webkit-transform-origin: 0 0;
	-moz-transform-origin: 0 0;
	transform-origin: 0 0;
	-webkit-transform: rotate(90deg) translateY(-30px);
	transform: rotate(90deg) translateY(-30px);
}

.book.bk-small .bk-left .book-spine-text {
	width: 100px;
}

/* Stín na hraně učebnice */
.book .bk-wrapper .bk-front > div {
	overflow: visible;
	border-radius: 0 3px 3px 0;
	box-shadow: inset 4px 0 10px rgba(0, 0, 0, 0.1);
}

/* Animace */
.book-animate {
	-webkit-transform: rotate3d(0,1,0,35deg);
	transform: rotate3d(0,1,0,35deg);
}

.book-item:hover .book .bk-wrapper .bk-book {
	-webkit-transform: rotate3d(0,1,0,35deg);
	transform: rotate3d(0,1,0,35deg);
}

.book-item li:hover .book .bk-wrapper .bk-book {
	-webkit-transform: rotate3d(0,1,0,35deg);
	transform: rotate3d(0,1,0,35deg);
}

.connection:hover .book .bk-wrapper .bk-book {
	-webkit-transform: rotate3d(0,1,0,35deg);
	transform: rotate3d(0,1,0,35deg);
}

/* Ohne hřbet */
.book .bk-wrapper .bk-left {
	height: 200px;
	width: 40px;
	-webkit-transform: rotate3d(0,1,0,-90deg);
	transform: rotate3d(0,1,0,-90deg);
}

.book.bk-small .bk-wrapper .bk-left {
	height: 125px;
	width: 20px;
}

/* Nastaví perspektivu */
.book .bk-wrapper {
	position: relative;
	width: 150px;
	z-index: 1;
	-webkit-perspective: 1800px;
	perspective: 1800px;
}

.book.bk-small .bk-wrapper {
	width: 100px;
}

/* Přechody */
.book .bk-wrapper .bk-book {
	position: absolute;
	width: 100%;
	height: 200px;
	-webkit-transform-style: preserve-3d;
	transform-style: preserve-3d;
	-webkit-transition: -webkit-transform .5s, background-color 2s;
	transition: transform .5s, background-color 2s;
}

.book.bk-small .bk-wrapper .bk-book {
	height: 125px;
}

/* Zarovná hřbet hnihy */
.book .bk-wrapper .bk-book > div, .book .bk-wrapper .bk-front > div {
	display: block;
	position: absolute;
}

/* Postrčí předek knihy dopředu */
.book .bk-wrapper .bk-front {
	-webkit-transform-style: preserve-3d;
	transform-style: preserve-3d;
	-webkit-transform-origin: 0% 50%;
	transform-origin: 0% 50%;
	-webkit-transition: -webkit-transform .5s, background-color 2s;
	transition: transform .5s, background-color 2s;
	-webkit-transform: translate3d(0,0,20px);
	transform: translate3d(0,0,20px);
	z-index: 10;
}

.book.bk-small .bk-wrapper .bk-front {
	-webkit-transform: translate3d(0,0,10px);
	transform: translate3d(0,0,10px);
}

/* Nastaví rozměry */
.book .bk-wrapper .bk-front, .book .bk-wrapper .bk-front > div {
	width: 150px;
	height: 200px;
}

.book.bk-small .bk-wrapper .bk-front, .book.bk-small .bk-wrapper .bk-front > div {
	width: 100px;
	height: 125px;
}

.book .bk-wrapper .bk-left{
	-webkit-transition: background-color 2s;
	width: 40px;
	left: -20px;
}

.book.bk-small .bk-wrapper .bk-left {
	left: -10px;
}

/* 3D efekt pro hranu - hřbet učebnice */
.book .bk-wrapper .bk-cover:after {
	content: '';
	position: absolute;
	top: 0;
	left: 10px;
	bottom: 0;
	width: 3px;
	background: rgba(0,0,0,0.06);
	box-shadow: 1px 0 3px rgba(255, 255, 255, 0.1);
}

/* Záda učebnice */
.bk-back {
	width: 150px;
	height: 200px;
	box-shadow:  0 10px 30px 0 rgba(0, 0, 0, .155);
    border: 1px solid rgba(0, 0, 0, .1);
}

.book.bk-small .bk-back {
	width: 100px;
	height: 125px;
}

.book .bk-back {
	-webkit-transform: rotate3d(0,1,0,-180deg) translate3d(0,0,20px);
	transform: rotate3d(0,1,0,-180deg) translate3d(0,0,20px);
	border-radius: 3px 0 0 3px;
}

.book.bk-small .bk-back {
	-webkit-transform: rotate3d(0,1,0,-180deg) translate3d(0,0,20px);
	transform: rotate3d(0,1,0,-180deg) translate3d(0,0,10px);
	border-radius: 3px 0 0 3px;
}

.book .bk-back:after {
	content: '';
	position: absolute;
	top: 0;
	left: 10px;
	bottom: 0;
	width: 3px;
	background: rgba(0,0,0,0.06);
	box-shadow: 1px 0 3px rgba(255, 255, 255, 0.1);
}

.book .bk-back:after {
	left: auto;
	right: 10px;
}

.book.bk-viewback .bk-book {
	-webkit-transform: translate3d(0,0,0px) rotate3d(0,1,0,180deg);
	transform: translate3d(0,0,0px) rotate3d(0,1,0,180deg);
}

.bk-name {
	width: 50%;
	margin-left: 28px;
	margin-top: 14px;
	opacity: .3;
	font-size: 10px;
	font-weight: 800;
	text-transform: uppercase;
	letter-spacing: 1px;
	line-height: 1.5em;
	padding-bottom: 10px;
	border-bottom: 1px solid rgba(0, 0, 0, .3);
	text-shadow: 1px 1px rgba(0, 0, 0, .1);
	mix-blend-mode: plus-darker;
}

.bk-small .bk-name {
	font-size: 7.5px;
	margin-left: 22px;
	margin-top: 10px;
}
