html {
    box-sizing: border-box;
}
#header {
    border-bottom: 30px solid #3A3A3A;
}
.container-content {
    position: relative;
    max-width: 1260px;
    margin: 0 auto;
    padding: 0 30px 0 30px;
}

.logo {
    display: block;
    width: 65%;
    min-width: 100px;
    min-height: 44px;
    max-width: 180px;
    text-align: center;
    padding: 10px 0;
}

.logo {
    max-width: 180px;
    min-height: 70px;
}
.logo img {
    max-width: 100%;
}

a {
    color: #3a3a3a;
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}

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

html,
body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: "Helvetica Neue", Verdana, Arial, sans-serif;
    color: #000;
    font-size: 16px;
}

h1 {
    font-weight: 500;
    font-size: 28px;
}

body {
    background: #ffffff;
    font-size: 16px;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}


/*
 * Styles for the deck of cards
 */


.deck {
    width: 100%;
    background: #716F71;
    padding: 1rem;
    border-radius: 4px;
    box-shadow: 8px 9px 26px 0 rgba(46, 61, 73, 0.5);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    align-items: center;
    margin: 0 0 3em;
}

.deck .card {
    height: 100px;
    width: 100px;
    margin: 0.2rem 0.2rem;
    background: #141214 url("../Img/Memo-RS.jpg");
    color: #ffffff;
    border-radius: 5px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 5px 2px 20px 0 rgba(46, 61, 73, 0.5);
}

.deck .card img {
    display: none;
    width: 100px;
}

.deck .card.open {
    transform: rotateY(0);
    background: #02b3e4;
    cursor: default;
    animation-name: flipInY;
    -webkit-backface-visibility: visible !important;
    backface-visibility: visible !important;
    animation-duration: .75s;
}

.deck .card.show img {
    display: block;
}


.deck .card.match {
    cursor: default;
    background: #E5F720;
    font-size: 33px;
    animation-name: rubberBand;
    -webkit-backface-visibility: visible !important;
    backface-visibility: visible !important;
    animation-duration: .75s;
}

.deck .card.match img {
    display: block;
}

.deck .card.unmatched {
    animation-name: pulse;
    -webkit-backface-visibility: visible !important;
    backface-visibility: visible !important;
    animation-duration: .75s;
    background: #e2043b;
}

.deck .card.disabled {
    pointer-events: none;
    opacity: 0.9;
}


/*
 * Styles for the Score Panel
 */


.score-panel {
    text-align: left;
    margin-bottom: 10px;
}

.score-panel .stars {
    margin: 0;
    padding: 0;
    display: inline-block;
    margin: 0 5px 0 0;
}

.score-panel .stars li {
    list-style: none;
    display: inline-block;
}

.score-panel .restart {
    float: right;
    cursor: pointer;
}

.fa-star {
    color: #FFD700;
}

.timer {
    display: inline-block;
    margin: 0 1rem;
}


/*
 * Styles for congratulations modal
 */


.overlay {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.7);
    transition: opacity 500ms;
    visibility: hidden;
    opacity: 0;
}

.overlay:target {
    visibility: visible;
    opacity: 1;
}

.popup {
    margin: 70px auto;
    padding: 20px;
    background: #ffffff;
    border-radius: 5px;
    width: 85%;
    position: relative;
    transition: all 5s ease-in-out;
}

.popup h2 {
    margin-top: 0;
    color: #000;
    text-align: center;
}

.popup .close {
    position: absolute;
    top: 20px;
    right: 30px;
    transition: all 100ms;
    font-size: 30px;
    font-weight: bold;
    text-decoration: none;
    color: #333;
}

.popup .close:hover {
    color: #E5F720;
}

.popup .content-1,
.content-2 {
    max-height: 30%;
    overflow: auto;
    text-align: center;
}

.show {
    visibility: visible !important;
    opacity: 100 !important;
}

#starRating li {
    display: inline-block;
}

#play-again {
    background-color: #141214;
    padding: 0.7rem 1rem;
    font-size: 1.1rem;
    display: block;
    margin: 0 auto;
    width: 50%;
    color: #ffffff;
    border-radius: 5px;
}

/* animations */
@keyframes flipInY {
    from {
        transform: perspective(400px) rotate3d(0, 1, 0, 90deg);
        animation-timing-function: ease-in;
        opacity: 0;
    }

    40% {
        transform: perspective(400px) rotate3d(0, 1, 0, -20deg);
        animation-timing-function: ease-in;
    }

    60% {
        transform: perspective(400px) rotate3d(0, 1, 0, 10deg);
        opacity: 1;
    }

    80% {
        transform: perspective(400px) rotate3d(0, 1, 0, -5deg);
    }

    to {
        transform: perspective(400px);
    }
}

@keyframes rubberBand {
    from {
        transform: scale3d(1, 1, 1);
    }

    30% {
        transform: scale3d(1.25, 0.75, 1);
    }

    40% {
        transform: scale3d(0.75, 1.25, 1);
    }

    50% {
        transform: scale3d(1.15, 0.85, 1);
    }

    65% {
        transform: scale3d(.95, 1.05, 1);
    }

    75% {
        transform: scale3d(1.05, .95, 1);
    }

    to {
        transform: scale3d(1, 1, 1);
    }
}

@keyframes pulse {
    from {
        transform: scale3d(1, 1, 1);
    }

    50% {
        transform: scale3d(1.2, 1.2, 1.2);
    }

    to {
        transform: scale3d(1, 1, 1);
    }
}



/* For Tablets and larger screens
****************/

@media (min-width: 768px) {
    .container {
        font-size: 22px;
    }

    .deck {
        width: 660px;
        height: 680px;
    }

    .deck .card {
        height: 125px;
        width: 125px;
    }

    .deck .card img {
        width: 125px;
    }

    .popup {
        width: 60%;
    }
}