body {
    background-color: #f4f4f9;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

h1 {
    text-align: center;
    padding: 20px;
    color: #333;
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-top: 0;
}

.contenedor-cronologia {
    position: relative;
    max-width: 1000px;
    margin: 40px auto;
    padding: 0 20px;
}

.contenedor-cronologia::after {
    content: '';
    position: absolute;
    width: 6px;
    background-color: #333;
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -3px;
}

.tarjeta {
    padding: 10px 40px;
    position: relative;
    background-color: inherit;
    width: 50%;
    box-sizing: border-box;
}

.tarjeta::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    right: -10px;
    background-color: white;
    border: 4px solid #FF9F55;
    top: 15px;
    border-radius: 50%;
    z-index: 1;
}

.izquierda {
    left: 0;
}

.derecha {
    left: 50%;
}

.derecha::after {
    left: -10px;
}

.contenido {
    padding: 20px;
    background-color: white;
    position: relative;
    border-radius: 6px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.etiqueta-fecha {
    background-color: #333;
    color: #fff;
    padding: 5px 10px;
    border-radius: 4px;
    font-weight: bold;
    display: inline-block;
    margin-bottom: 10px;
    font-size: 0.85em;
}

h2 {
    margin-top: 0;
    color: #2c3e50;
}

.lugares {
    font-style: italic;
    color: #666;
    font-size: 0.9em;
    margin-bottom: 10px;
    display: block;
}

p {
    line-height: 1.6;
    color: #444;
}

footer {
    text-align: center;
    padding: 20px;
    background-color: #333;
    color: white;
    margin-top: 40px;
}

footer a {
    color: #009dff;
    text-decoration: none;
}

footer p {
    color: #d8d8d8; 
    margin: 0;
}

@media screen and (max-width: 600px) {
    .contenedor-cronologia::after {
        left: 31px;
    }

    .tarjeta {
        width: 100%;
        padding-left: 70px;
        padding-right: 25px;
    }

    .tarjeta::after {
        left: 21px;
    }

    .derecha {
        left: 0%;
    }
}