body {
    --gap: 25px;
    --size: 130px;
    margin: 0 auto;
    padding: 0;
    font-family: Arial, sans-serif;
    background: #CFD0CF;
    color: #434344;
    text-align: center;
    overflow: hidden;
    user-select: none;
}

h1 {
    line-height: 47px;
    padding: 40px 0;
    margin: 0;
    font-size: 42px;
}

.field {
    margin: 0 auto;
    width: calc(4 * var(--size) + 3 * var(--gap));
    display: grid;
    flex-grow: 3;
    grid-gap: var(--gap);
    grid-template-columns: repeat(4, 1fr);
    perspective: 600px;
}

.card {
    box-sizing: border-box;
    width: var(--size);
    height: var(--size);
    border: 5px solid #fff;
    border-radius: 9px;
    background: linear-gradient(45deg, #22AB93, #19668D);
    box-shadow: 1px 1px 5px rgba(0,0,0,0.5) ;
    color: rgba(0,0,0,0);
    transition-duration: 0.5s;
    cursor: pointer;
}

.card:after {
    position: relative;
    top: 15px;
    font-size: 75px;
    content: attr(data-value);
}

.opened {
    transform: rotate3d(0,1,0,180deg);
    animation: cardRotation;
    animation-duration: 0.5s;
    animation-direction: normal;
    animation-fill-mode: forwards;
}

.wrong {
    transform: rotate3d(0,1,0,180deg) !important;
    background: #F00 !important;
}

.finished {
    background: #0F0 !important;
}

.time {
    display: none;
    margin-top: 30px;
    font-size: 32px;
    font-weight: bold;
}

@keyframes cardRotation {
    25% {
        color: rgba(0,0,0,0);
    }

    100% {
        background: linear-gradient(90deg, #ffffff, #ffffff);
        color: rgba(0,0,0,1);
    }
}


.gameOver {
    display: none;
    width: 100%;
    height: 100vh;
    position: absolute;
    background: rgba(0,0,0,0.5);
    z-index: 1;
}

.messageBox {
    --msgBoxHeight: 188px;
    display: block;
    height: var(--msgBoxHeight);
    width: 380px;
    min-width: 350px;
    background: white;
    margin-left: auto;
    margin-right: auto;
    margin-top: calc(50vh - var(--msgBoxHeight)/2);
}

.message {
    padding-top: 30px;
    padding-bottom: 40px;
    font-size: 42px;
    font-weight: bold;
}

.newGame {
    width: 80px;
    display: block;
    margin: 0 auto;
    font-size: 17px;
    padding: 10px 30px;
    border-radius: 5px;
    background: linear-gradient(45deg, #19668D, #22AB93);
    color: #FFF;
    box-shadow: 1px 1px 1px rgba(0,0,0,0.5) ;
}

.newGame:hover {
    background: linear-gradient(45deg, #19668D, #22CD93);
    cursor: pointer;
}

.newGame:active {
    box-shadow: inset -2px 1px 8px rgba(0,0,0,0.5) ;
}


.show {
    display: block;
}


.letter {
    display: inline-block;
}


@keyframes dancingCaption {
    100% {
        transform: scaleY(1.50) translateY(-10px);
    }
}



/*.card {*/
    /*height: 130px;*/
    /*width: 130px;*/
    /*box-sizing: border-box;*/
    /*background: linear-gradient(45deg, #22ab93, #19668d);*/
    /*border: 5px solid #fff;*/
    /*border-radius: 9px;*/
    /*box-shadow: 1px 1px 5px rgba(0, 0, 0, 0.5);*/
    /*perspective: 60px;*/
    /*transition: 0.5s;*/
    /*color: rgba(0,0,0,0);*/
/*}*/

/*.opened {*/
    /*transform: rotateY(180deg);*/
    /*background: #fff;*/
    /*display: flex;*/
    /*justify-content: center;*/
    /*align-items: center;*/
    /*border: 0;*/
    /*color: rgba(0,0,0,1);*/
/*}*/

/*.opened:before {*/
    /*font-size: 75px;*/
    /*content: attr(data-value);*/
/*}*/

/*.matched {*/
    /*background: green;*/
/*}*/