body {
    font-family: 'Playfair Display', serif;
    background-color: #f4f8f9;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
}

.carta {
    background-color: #ffffff;
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    padding: 30px;
    width: 90%;
    max-width: 700px;
}

.header-image {
    position: relative;
    margin-bottom: 25px;
    border-radius: 12px;
    overflow: hidden;
}

.foto {
    width: 100%;
    height: auto;
    display: block;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.2);
}

.contenido {
    line-height: 1.8;
    color: #333;
    font-size: 1.15em;
}

.saludo, .firma, .nombre {
    text-align: center;
    margin-bottom: 20px;
}

.saludo {
    font-size: 2em;
    color: #4a6572;
}

.firma {
    margin-top: 25px;
}

@media (max-width: 600px) {
    .contenido {
        font-size: 1.1em;
    }
    .saludo {
        font-size: 1.8em;
    }
}