body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(to bottom right, #ff9a8b, #e6ccd1, #ff99ac);
}

.ficha {
    width: 300px;
    background: white;
    border-radius: 10px;
    box-shadow: 0px 0px 10px gray;
    text-align: center;
    padding: 20px;
    position: relative;
}

.encabezado {
    background: red;
    height: 30px;
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
}

#tablero {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-top: 20px;
}

.carta {
    width: 60px;
    height: 80px;
    background-color: lightgray;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    border-radius: 5px;
    user-select: none;
}

.carta.visible {
    background-color: white;
    box-shadow: 0px 0px 5px black;
}

.carta.acertada {
    background-color: lightgreen;
    cursor: default;
}

button {
    margin-top: 15px;
    padding: 10px;
    font-size: 16px;
    cursor: pointer;
    background-color: lightblue;
    border: none;
    border-radius: 5px;
}

button:hover {
    background-color: deepskyblue;
}