@import url('https://fonts.googleapis.com/css2?family=Poppins&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Poppins", sans-serif;
}

.container {
    width: 100%;
    height: 100vh;
    background-image: radial-gradient(circle at 67% 83%, hsla(317, 0%, 96%, 0.05) 0%, hsla(317, 0%, 96%, 0.05) 1%, transparent 1%, transparent 5%, transparent 5%, transparent 100%), radial-gradient(circle at 24% 80%, hsla(317, 0%, 96%, 0.05) 0%, hsla(317, 0%, 96%, 0.05) 27%, transparent 27%, transparent 63%, transparent 63%, transparent 100%), radial-gradient(circle at 23% 5%, hsla(317, 0%, 96%, 0.05) 0%, hsla(317, 0%, 96%, 0.05) 26%, transparent 26%, transparent 82%, transparent 82%, transparent 100%), radial-gradient(circle at 21% 11%, hsla(317, 0%, 96%, 0.05) 0%, hsla(317, 0%, 96%, 0.05) 35%, transparent 35%, transparent 45%, transparent 45%, transparent 100%), radial-gradient(circle at 10% 11%, hsla(317, 0%, 96%, 0.05) 0%, hsla(317, 0%, 96%, 0.05) 21%, transparent 21%, transparent 81%, transparent 81%, transparent 100%), radial-gradient(circle at 19% 61%, hsla(317, 0%, 96%, 0.05) 0%, hsla(317, 0%, 96%, 0.05) 20%, transparent 20%, transparent 61%, transparent 61%, transparent 100%), radial-gradient(circle at 13% 77%, hsla(317, 0%, 96%, 0.05) 0%, hsla(317, 0%, 96%, 0.05) 63%, transparent 63%, transparent 72%, transparent 72%, transparent 100%), radial-gradient(circle at 30% 93%, hsla(317, 0%, 96%, 0.05) 0%, hsla(317, 0%, 96%, 0.05) 33%, transparent 33%, transparent 82%, transparent 82%, transparent 100%), linear-gradient(90deg, rgb(22, 176, 207), rgb(103, 7, 215));
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.header {
    width: 100%;
    height: 200px;
    padding-top: 25px;
    margin-bottom: 25px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.header h1 {
    font-size: 64px;
    padding: 10px;
    margin-bottom: 10px;
    color: white;
}

.header button {
    width: 125px;
    height: 50px;
    border: 2px solid black;
    border-radius: 12px;
    background-color: rgb(240, 128, 36);
    cursor: pointer;
    font-size: 18px;
}

.board {
    width: auto;
    height: auto;
    padding: 10px;
    margin-bottom: 20px;
    border: 3px double black;
    background-color: wheat;
    display: grid;
    grid-template-columns: auto auto auto auto;
    justify-content: space-around;
    gap: 4px;
    align-items: center;
}

.cards {
    width: auto;
    height: auto;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    border: 2px solid black;
}

.front {
    width: 80px;
    height: 80px;
    position: absolute;
    display: flex;
    justify-content: center;
    align-items: center;
    transform: rotateY(90deg);
}

.front img {
    width: 65px;
    height: 65px;

}

.back {
    width: 80px;
    height: 80px;
    background-image: linear-gradient(216deg, rgba(77, 77, 77, 0.05) 0%, rgba(77, 77, 77, 0.05) 25%, rgba(42, 42, 42, 0.05) 25%, rgba(42, 42, 42, 0.05) 38%, rgba(223, 223, 223, 0.05) 38%, rgba(223, 223, 223, 0.05) 75%, rgba(36, 36, 36, 0.05) 75%, rgba(36, 36, 36, 0.05) 100%), linear-gradient(44deg, rgba(128, 128, 128, 0.05) 0%, rgba(128, 128, 128, 0.05) 34%, rgba(212, 212, 212, 0.05) 34%, rgba(212, 212, 212, 0.05) 57%, rgba(25, 25, 25, 0.05) 57%, rgba(25, 25, 25, 0.05) 89%, rgba(135, 135, 135, 0.05) 89%, rgba(135, 135, 135, 0.05) 100%), linear-gradient(241deg, rgba(55, 55, 55, 0.05) 0%, rgba(55, 55, 55, 0.05) 14%, rgba(209, 209, 209, 0.05) 14%, rgba(209, 209, 209, 0.05) 60%, rgba(245, 245, 245, 0.05) 60%, rgba(245, 245, 245, 0.05) 69%, rgba(164, 164, 164, 0.05) 69%, rgba(164, 164, 164, 0.05) 100%), linear-gradient(249deg, rgba(248, 248, 248, 0.05) 0%, rgba(248, 248, 248, 0.05) 32%, rgba(148, 148, 148, 0.05) 32%, rgba(148, 148, 148, 0.05) 35%, rgba(202, 202, 202, 0.05) 35%, rgba(202, 202, 202, 0.05) 51%, rgba(181, 181, 181, 0.05) 51%, rgba(181, 181, 181, 0.05) 100%), linear-gradient(92deg, hsl(214, 0%, 11%), hsl(214, 0%, 11%));
}

.flipcard {
    transform: rotateY(0deg);
}

.matched {
    transform: rotateY(0deg);
    background-color: greenyellow;
}

span {
    margin-top: 10px;
    font-size: 24px;
    width: 400px;
    font-weight: bolder;
    color: white;
    background-color: red;
    display: flex;
    justify-content: center;
    border-radius: 24px;
}


@media (max-width:768px) {
    .header h1 {
        font-size: 32px;
        padding: 10px;
        margin-bottom: 10px;
        color: white;
    }
    span {
        margin-top: 10px;
        font-size: 16px;
        font-weight: bolder;
    }
    .front {
        width: 50px;
        height: 50px;
        position: absolute;
        display: flex;
        justify-content: center;
        align-items: center;
        transform: rotateY(90deg);
    }

    .front img {
        width: 45px;
        height: 45px;

    }

    .back {
        width: 50px;
        height: 50px;
        background-image: linear-gradient(216deg, rgba(77, 77, 77, 0.05) 0%, rgba(77, 77, 77, 0.05) 25%, rgba(42, 42, 42, 0.05) 25%, rgba(42, 42, 42, 0.05) 38%, rgba(223, 223, 223, 0.05) 38%, rgba(223, 223, 223, 0.05) 75%, rgba(36, 36, 36, 0.05) 75%, rgba(36, 36, 36, 0.05) 100%), linear-gradient(44deg, rgba(128, 128, 128, 0.05) 0%, rgba(128, 128, 128, 0.05) 34%, rgba(212, 212, 212, 0.05) 34%, rgba(212, 212, 212, 0.05) 57%, rgba(25, 25, 25, 0.05) 57%, rgba(25, 25, 25, 0.05) 89%, rgba(135, 135, 135, 0.05) 89%, rgba(135, 135, 135, 0.05) 100%), linear-gradient(241deg, rgba(55, 55, 55, 0.05) 0%, rgba(55, 55, 55, 0.05) 14%, rgba(209, 209, 209, 0.05) 14%, rgba(209, 209, 209, 0.05) 60%, rgba(245, 245, 245, 0.05) 60%, rgba(245, 245, 245, 0.05) 69%, rgba(164, 164, 164, 0.05) 69%, rgba(164, 164, 164, 0.05) 100%), linear-gradient(249deg, rgba(248, 248, 248, 0.05) 0%, rgba(248, 248, 248, 0.05) 32%, rgba(148, 148, 148, 0.05) 32%, rgba(148, 148, 148, 0.05) 35%, rgba(202, 202, 202, 0.05) 35%, rgba(202, 202, 202, 0.05) 51%, rgba(181, 181, 181, 0.05) 51%, rgba(181, 181, 181, 0.05) 100%), linear-gradient(92deg, hsl(214, 0%, 11%), hsl(214, 0%, 11%));
    }

    .flipcard {
        transform: rotateY(0deg);
    }

    .matched {
        transform: rotateY(0deg);
        background-color: greenyellow;
    }

    span {
        margin-top: 10px;
        font-size: 24px;
        width: 300px;
        font-weight: bolder;
        color: white;
        background-color: red;
        display: flex;
        justify-content: center;
        border-radius: 24px;
    }
}