html {
    width: 100%;
    height: 100%;
    background: linear-gradient(325deg, #6f00fc 0%, #fc7900 50%, #fcc500b9 100%);
    font-family: 'Lexend', sans-serif;
}

body {
    overflow: hidden;
}

.game {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    margin-bottom: 20px;
}

#rulesBtn {
    flex: 1;
    margin-right: 10px;
    background: #282A3A;
    color: #FFF;
    border-radius: 5px;
    padding: 10px 20px;
    border: 0;
    cursor: pointer;
    font-family: 'Lexend', sans-serif;
    font-size: 18pt;
    box-shadow: 5px 3px 15px 1px darkblue;
    transition: all 0.5s;
}

#rulesBtn:hover {
    color: #ed977c;
    background-color: #3e415a;
}

.stats {
    flex: 2;
    display: flex;
    justify-content: space-around;
    color: #FFF;
    font-size: 14pt;
    border: 1px dotted floralwhite;
    padding: 10px;
    border-radius: 7px;
    box-shadow: 5px 3px 15px 1px darkblue;
}

.board-container {
    position: relative;
}

.board, .win {
    border-radius: 5px;
    box-shadow: 0 25px 50px rgb(33 33 33 / 25%);
    background: linear-gradient(135deg, #ffff00a8 0%, #ff7b00 50%, #ff2a00 100%);
    transition: transform .6s cubic-bezier(0.4, 0.0, 0.2, 1);
    backface-visibility: hidden;
}

.board {
    padding: 20px;
    display: grid;
    grid-template-columns: repeat(4, auto);
    grid-gap: 20px;
}

.board-container.flipped .board {
    transform: rotateY(180deg) rotateZ(50deg);
}

.board-container.flipped .win {
    transform: rotateY(0) rotateZ(0);
}

.card {
    position: relative;
    width: 100px;
    height: 100px;
    cursor: pointer;
}

.card-front, .card-back {
    position: absolute;
    border-radius: 5px;
    width: 100%;
    height: 100%;
    background: #3a3328;
    transition: transform .6s cubic-bezier(0.4, 0.0, 0.2, 1);
    backface-visibility: hidden;
}

.card-back {
    transform: rotateY(180deg) rotateZ(50deg);
    user-select: none;
    background: #FDF8E6;
}

.card-back img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card.flipped .card-front {
    transform: rotateY(180deg) rotateZ(50deg);
}

.card.flipped .card-back {
    transform: rotateY(0) rotateZ(0);
}

.win {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    text-align: center;
    background: #FDF8E6;
    transform: rotateY(180deg) rotateZ(50deg);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

#shareBtn, #replayBtn {
    font-size: 16pt;
    background: #282A3A;
    color: #FFF;
    border-radius: 5px;
    padding: 10px 20px;
    border: 0;
    cursor: pointer;
    font-family: 'Lexend', sans-serif;
    margin: 10px;
}

.popup {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.4);
}

.popup-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 600px;
    border-radius: 5px;
}

.scorecard-img {
    max-width: 100%;
    height: auto;
    margin: 20px 0;
    border-radius: 5px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

.close:hover, .close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}

.error-message {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(325deg, #6f00fc 0%, #fc7900 50%, #fcc500b9 100%);
    z-index: 1000;
}

.error-message h1 {
    color: white;
    text-align: center;
    font-family: 'Lexend', sans-serif;
    font-size: 24px;
    padding: 20px;
}

@media (max-width: 700px) {
    .board-container {
        width: 370px;
    } 

    .card {
        width: 70px;
        height: 70px;
    }

    .card-back {
        line-height: 70px;
    }

    .card-back img {
        width: 100%;
        height: 100%;
        object-fit: cover;
    }
}