.tema-intro {
    background-color: #f0f4f8;
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid #2c3e50;
    margin-bottom: 2rem;
}

.caja-concepto {
    background: #fff;
    border: 1px solid #eee;
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 6px;
}

.caja-concepto h4 {
    color: #d32f2f; 
    margin-bottom: 0.5rem;
}

.contenedor-img-tema {
    text-align: center; 
    margin-bottom: 2rem;
}

.img-tema {
    max-width: 100%;
    width: 300px; 
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.img-tema:hover {
    transform: scale(1.05); /* zoom al pasar el raton por la imagen */
}