.memory-game {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1em;
    overflow: hidden;
    position: relative;
    /* background-color: #f0f0f0; */
}
.memory-board {
    width: 100%;
    margin: 0;
    padding: 0;
    position: relative;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(10.5%, 1fr));
    grid-gap: 4% 2%;
}
/*
    @media $query.m
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr))
        grid-gap: 20px
*/

.memory-card-item {
    width: 100%;
    height: 100%;
    /* border: 3px solid #f1f1f1; */
    perspective: 1000px; /* Remove this if you don't want the 3D effect */
    background-color: transparent;
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}
.memory-card-item.visible .memory-card-item-inner {
    transform: rotateY(180deg);
}
.memory-card-item.no-match:before {
    content: '';
    width: 100%;
    height: 100%;
    z-index: 1;
    position: absolute;
    top: 0;
    left: 0;
    background-color: rgba(255, 50, 50, 0.5);
}
.memory-card-item.solved {
    opacity: 0.0;
}
.memory-card-item.solved .memory-card-item-inner {
    transform: rotateY(180deg);
}

.memory-card-item:nth-child(n+1) {
    transform: rotate(1.2deg);
}
.memory-card-item:nth-child(2n+1) {
    transform: rotate(-1.8deg);
}
.memory-card-item:nth-child(3n+1) {
    transform: rotate(1.4deg);
}
.memory-card-item:nth-child(4n+1) {
    transform: rotate(-1.4deg);
}
.memory-card-item:nth-child(5n+1) {
    transform: rotate(1.8deg);
}
.memory-card-item:nth-child(6n+1) {
    transform: rotate(0.8deg);
}
.memory-card-item:nth-child(7n+1) {
    transform: rotate(-1.2deg);
}

.memory-card-item-inner {
    width: 100%;
    padding-top: 100%;
    display: block;
    text-align: center;
    position: relative;
    transition: transform 0.25s;
    transform-style: preserve-3d;
}

.memory-card-item-front,
.memory-card-item-back {
    top: 0;
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}
.memory-card-item-front {
    padding: 20px;
    color: black;
    cursor: pointer;
    box-shadow: inset 0 0 8px rgba(0,0,0, 0.25);
    transition: all 150ms ease-in-out;
    background: repeating-linear-gradient(
        -45deg,
        #222,
        #222 10px,
        #333 10px,
        #333 20px
    );

}

/*
.memory-item:hover .memory-item-inner {
    transform: rotateY(25deg);
}
*/
.memory-card-item:hover .memory-card-item-front {
    background: repeating-linear-gradient(
            -45deg,
            #333,
            #333 10px,
            #444 10px,
            #444 20px
    );
}
.memory-card-item-back {
    color: white;
    transform: rotateY(180deg);
}
.memory-card-item img {
    height: 100%;
}




.memory-ui {
    height: 50px;
    margin: 3em 0;
    padding: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 20px;
    background-color: rgba(255,255,255,0.65);
}
.memory-ui .memory-moves {
    display: flex;
}
.memory-ui .memory-matches {
    display: flex;
    align-items: center;
}
#memoryMoves,
#memoryMatches {
    margin: 0 5px;
    font-weight: 500;
}
.memory-matches-cards {
    margin: 0 20px;
}
.memory-matches-cards,
.memory-matches-cards:before {
    width: 64px;
    height: 64px;
    display: block;
    transform: rotate(-16deg);
    border-radius: 4px;
    box-sizing: border-box;
    border: 2px solid #666;
    background: repeating-linear-gradient(
        -45deg,
        #222,
        #222 5px,
        #333 5px,
        #333 10px
    );
}
.memory-matches-cards:before {
    content: '';
    transform: rotate(18deg);
}





.memory-slider {
    width: 300px;
    height: auto;
    margin-left: -150px;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 1.0;
    position: absolute;
    left: 50%;
    top: 60%;
    transform: scale(1.0);

    visibility: hidden;
    backface-visibility: hidden;
}
.memory-slider.no-match {
    color: red;
    font-size: 40px;
    font-weight: 600;
    text-transform: uppercase;
    text-shadow: #fff 0 1px 1px;
}
.memory-slider.match {
    color: green;
    font-size: 40px;
    font-weight: 600;
    text-transform: uppercase;
    text-shadow: #fff 0 1px 1px;
}
.memory-slider.show {
    visibility: visible;
    transition: all 1000ms;
}
.memory-slider.show.slideUp {
    top: 50%;
    opacity: 0.0;
}



.move-item {
    width: 64px;
    height: 64px;
    display: block;
    position: fixed;
    transition: all 350ms ease-out;
}
.move-item img {
    width: 100%;
    height: 100%;
}





.playBtn {
    width: auto;
    min-width: 240px;
    margin: 10px auto;
    padding: 12px;
    display: inline-block;
    cursor: pointer;
    color: #fff;
    font-size: 16px;
    font-weight: 500;
    text-align: center;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    outline: none;
    border: 0;
    border-radius: 4px;
    background-color: #00a175;
    transition: all 80ms ease-in-out;
}
.playBtn:hover {
    background-color: #00c48e;
    text-decoration: none;
}