:root {
  --background: rgba(0, 0, 0, .75);
  --darkGrey:#1d1d1d;
  --midGrey:#aaa;
  --lightGrey: #ccc;
  --lightest: #fff;
  --veryLight: #e3e3e3;
}

*, *::before, *::after {
  box-sizing: border-box;
}

body {
	margin: 0;
	background: #ebebeb;
	font-family: 'Work Sans', sans-serif;
	font-weight: 300;
    width: 100%;
    height: 100%;
}

.mainBooks{
    display: grid;
    grid-template-columns: 1% 1fr 1%;
    grid-template-areas: ". title ."
        ". allBooks ."
        "footer footer footer";
    text-align: center;
    background: var(--veryLight);
}

.titleBooks{
    background: var(--background);
    color: var(--lightGrey);
    grid-area: title;
    text-align: left;
    height: 8rem;
    padding: 4em 1em 2em 1em; /*top left bottom right*/
}

.titleBooks a{
    color: var(--lightkGrey);
    text-decoration: none;
}

.titleBooks a:hover {
  color: red; 
}

.allCards{
    display: grid;
    grid-template-columns: repeat(auto-fit,16rem);
    grid-area: allBooks;
    grid-gap: 2rem;
    justify-content: flex-start;
}

/*=== card effect ===*/
.card{
    position: relative;
    cursor: pointer;
    width: 100%;
    height: 350px;
    -webkit-transform-style: preserve-3d;
    transition: all 0.75s ease;
    margin: 1em;
}

.cardFront,
.cardBack{
    width: 100%;
    height: 100%;
    overflow: hidden;
    -webkit-perspective: 0;
    -webkit-backface-visibility: hidden;
    -webkit-transform: translate3d(0,0,0);
    visibility:visible;
    backface-visibility: hidden;
    position: absolute;
    transition: transform .75s liner;
}

/*=== this code is require for Safari, otherwise the text is mirrored
    -webkit-perspective: 0;
    -webkit-backface-visibility: hidden;
    -webkit-transform: translate3d(0,0,0);
    visibility:visible;
    backface-visibility: hidden;
===*/

.cardFront img{ /* book photo */
    height: 100%;
    width: 100%;
    display: block;

}

.cardFront{
    background: var(--lightest);
    backface-visibility: hidden;
}

.cardBack{
    background: var(--lightest);
    backface-visibility: hidden;
    transform: rotateY(.5turn);
    background-image: url(../img/2017-FoFgrey15.png);
    background-repeat: no-repeat;
    background-position: center;
}

.cardBack--content{
    color: var(--darkGrey);
    text-align: left;
    width: 100%;
    padding: 1em;
    display: grid;
    grid-template-columns: 1% 1fr 1%;
    grid-template-areas: ". cardName ."
        ". cardWho ."
        ". cardType .";
    grid-template-rows: .5fr 2.6fr .5fr;
    /*transform: rotateY(.5turn);*/
}

.cardType{
    grid-area: cardType; /* area Fan is famous */
    background-color: var(--background);
    color: var(--lightest);
    font-size: 2em;
    padding: .25em .5em 1em .5em; /*top left bottom right*/ 

}

.cardName{ /* book title */
    grid-area: cardName;
    font-size: 1.5em;
}

.cardWho{ /* author */
    grid-area: cardWho;
    font-style: italic;
    padding: 0 0 1em 0;
}

.card:hover{
    transform: rotateY(.5turn);
}
/*=== end of card effect ===*/