body {
    font-family: Arial, sans-serif;
    text-align: center;
    background-color: #f0f0f0;
    margin: 0;
    padding: 0;
}

#game-container {
    margin: 20px auto;
    max-width: 600px;
}

h1 {
    color: #333;
}

#game-board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-top: 20px;
}

.card {
    position: relative;
    width: 100px;
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid #ccc;
    border-radius: 8px;
    background-color: white;
    cursor: pointer;
    font-size: 24px;
    overflow: hidden;
    transition: transform 0.2s ease;
}

.card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('https://i.ibb.co/rmNy9rF/kint-icono.png');
    background-size: cover;
    background-position: center;
    z-index: 1;
}

/* Ocultar el logo cuando la carta esté abierta */
.card.open::before {
    display: none;
}

/* Cuando las cartas están emparejadas, no mostramos el logo */
.card.matched::before {
    display: none;
}

/* Efecto hover para las cartas */
.card:hover {
    transform: scale(1.05);
}

/* Estilo para las cartas emparejadas */
.card.matched {
    background-color: #8bc34a;
    color: white;
}

#claim-coupon {
    margin-top: 20px;
    padding: 10px 20px;
    font-size: 16px;
    background-color: #4caf50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

#claim-coupon:hover {
    background-color: #45a049;
}