/* Configuración estructural base */
body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f9;
    color: #333;
    padding: 20px;
    margin: 0;
}

h1 {
    color: #2c3e50;
    border-bottom: 2px solid #2c3e50;
    padding-bottom: 10px;
}

h2 {
    color: #2c3e50;
    margin-top: 5px;
    font-size: 1.3rem;
}

.ejercicio {
    background-color: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.explicacion {
    background-color: #fafafa;
    padding: 10px 15px;
    border-left: 4px solid #805ad5;
    margin-bottom: 20px;
    border-radius: 0 4px 4px 0;
}

.sub-tecnico {
    font-size: 0.85rem;
    color: #718096;
    margin-top: 5px;
}

/* Layout del Visualizador */
.marco-visualizador {
    position: relative;
    width: 400px;
    height: 200px;
    margin: 20px 0;
}

.capa-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 400px;
    height: 200px;
    z-index: 0;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.capa-img.activa {
    z-index: 1;
    opacity: 1;
}