@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700;800;900&display=swap');


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

:root{
    --bg-main: #464646;
    --bg-card: #2D2727;
    --border-color: #efc745;
}

body{
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    flex-direction: column;
    background-color: var(--bg-main);
}

h1{
    color: #ffff;
    font-weight: 500px;
    font-size: 40px;
}

span{
    color: var(--border-color);
}

#card-section{
    margin-top: 30px;
    display: grid;
    grid-template-columns: repeat(4,1fr);
    gap: 32px;
}

/* .card{
    width: 160px;
    height: 140px;
    background-color: var(--bg-card);
    border-radius: 10px;
    box-shadow: 0px 8px 24px rgba(149,157,165,0.2);
    padding: 32px;
}

.card_selected{
    border: 5px solid var(--border-color);
}

.card_match {
    border: 10px solid purple;
} */

.card {
    position: relative;
    transition: all .4s linear;
    transform-style: preserve-3d;
}

.card,
.back-card,
.front-card {
    height: 10rem;
    width: 10rem;
}

.back-card,
.front-card {
    position: absolute;
    backface-visibility: hidden;
}

.front-card {
    background: var(--border-color);
    background-size: contain;
    border-radius: .6rem;
    box-shadow: rgba(149, 157, 165, 0.2) 0px 8px 24px;
    padding: 2rem;
}

.back-card {
    transform: rotateY(180deg);
    /* background-color: #6589F9; */
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center center;
    box-shadow: rgba(149, 157, 165, 0.2) 0px 8px 24px;
    padding: 2rem;
}

.card_selected {
    transform: rotateY(180deg);
}

.card_match .front-card {
    background-color: var(--bg-card);
}