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; }

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

/* --- ESTILO AZUL UNIFICADO --- */
.explicacion {
    background-color: #ebf8ff;
    padding: 10px 15px;
    border-left: 4px solid #3182ce;
    margin-bottom: 20px;
    border-radius: 0 4px 4px 0;
    color: #2b6cb0;
}

.contenedor-efecto {
    background-color: #fcfcfc;
    padding: 20px;
    border: 2px dashed #cbd5e0;
    border-radius: 6px;
    text-align: center;
    margin-top: 20px;
}

#marquesina {
    font-size: 1.5rem;
    font-weight: bold;
    color: #3182ce; /* Azul corporativo */
    padding: 20px;
    min-height: 40px;
    overflow: hidden;
    white-space: nowrap;
}

.btn-interactivo { 
    padding: 10px 20px; 
    background-color: #3182ce; 
    color: white; 
    border: none; 
    border-radius: 4px; 
    font-weight: bold; 
    cursor: pointer; 
}
.btn-interactivo:hover { background-color: #2b6cb0; }