\documentclass[12pt,a4paper]{article}

% =========================
% PACKAGES
% =========================
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[english,spanish,portuguese]{babel}
\usepackage[a4paper,margin=2.5cm]{geometry}
\usepackage{setspace}
\usepackage{parskip}
\usepackage{titlesec}
\usepackage{enumitem}
\usepackage{hyperref}
\usepackage{graphicx}
\usepackage{fancyhdr}
\usepackage{multicol}

% =========================
% GENERAL CONFIG
% =========================
\setlength{\parindent}{0pt}
\setlength{\parskip}{0.4em}
\setlength{\columnsep}{0.8cm}

\hypersetup{
	colorlinks=true,
	urlcolor=blue,
	linkcolor=black
}

% Roman numbering
\renewcommand{\thesection}{\Roman{section}}

% Section style
\titleformat{\section}
{\normalfont\bfseries\large}
{\thesection.}{0.5em}{}

\titlespacing*{\section}{0pt}{0.4em}{0.4em}

% Footer
\pagestyle{fancy}
\fancyhf{}
\rfoot{\thepage}
\renewcommand{\headrulewidth}{0pt}

\begin{document}
	
	% =========================
	% TITLES
	% =========================
	\begin{center}
		{\LARGE \textbf{Article Title (In English)}\par}
		\vspace{0.4em}
		{\large \textbf{Article Title (In Spanish)}\par}
		\vspace{0.4em}
		{\large \textbf{Article Title (In Portuguese)}\par}
	\end{center}
	
	\vspace{1em}
	
	% =========================
	% AUTHORS
	% =========================
	\begin{center}
		\textbf{Last Name, First Name Author 1}\textsuperscript{1}\\
		Author 1 Affiliation (Institution)\\
		ORCID: \href{https://orcid.org/0000-0000-0000-0000}{https://orcid.org/0000-0000-0000-0000}
		
		\vspace{0.8em}
		
		\textbf{Last Name, First Name Author 2}\textsuperscript{2}\\
		Author 2 Affiliation (Institution)\\
		ORCID: \href{https://orcid.org/0000-0000-0000-0000}{https://orcid.org/0000-0000-0000-0000}
	\end{center}
	
	\vspace{1em}
	
	% =========================
	% ABSTRACTS
	% =========================
	\selectlanguage{english}
	\section*{Abstract}
	Write the structured abstract in English including objectives, methods, results, and conclusions (Maximum 250 words).
	
	\textbf{Keywords:} keyword 1; keyword 2; keyword 3; keyword 4; keyword 5.
	
	\vspace{0.8em}
	
	\selectlanguage{portuguese}
	\section*{Resumo}
	Write the structured abstract in Portuguese with objectives, methods, results and conclusions (Maximum 250 words).
	
	\textbf{Palavras-chave:} palavra 1; palavra 2; palavra 3; palavra 4; palavra 5.
	
	\vspace{0.8em}
	
	\selectlanguage{spanish}
	\section*{Resumen}
	Write the structured abstract in Spanish including objectives, methods, results, and conclusions (Maximum 250 words).
	
	\textbf{Palabras clave:} palabra 1; palabra 2; palabra 3; palabra 4; palabra 5.
	
	\vspace{1em}
	
	\selectlanguage{english}
	
	% =========================
	% TWO COLUMNS FROM HERE
	% =========================
	\raggedcolumns
	\begin{multicols}{2}
		
		\section{INTRODUCTION}
		Explain the research problem and its relevance. Highlight the objectives of the study and its contribution to the scientific field, including background, justification, and theoretical foundations.
		
		\section{METHODS}
		Describe the study design, specifying the type of research and justifying its selection. Detail the population, sample, and selection criteria, as well as the instruments used for data collection and the analytical methods applied. Ethical considerations must also be included, such as institutional approvals and informed consent from participants.
		
		\section{RESULTS}
		Present findings clearly, using tables, charts, or figures when necessary. Emphasize how the results reflect interdisciplinary interaction.
		
		\section{DISCUSSION}
		Interpret the results within the context of the research problem and the disciplines involved. Analyze implications, limitations, and possible applications of the study.
		
		\section*{CONCLUSIONS}
		Summarize the main contributions of the work, highlighting its relevance to the disciplines involved and suggesting future research directions.
		
		\section*{REFERENCES}
		
		The types of reference styles to be used are detailed according to the research area addressed in the article:
		
		\begin{itemize}
			\item[a)] Education: APA.
			\item[b)] Engineering, Technology, and Computer Science:
			\begin{itemize}
				\item[b.1.] IEEE – Social sciences, innovation, UX, etc.
				\item[b.2.] APA – Technical engineering, AI, systems.
			\end{itemize}
			\item[c)] Health Sciences: Vancouver.
			\item[d)] Basic Sciences: APA.
			\item[e)] Management: APA.
			\item[f)] Law: APA.
		\end{itemize}
		
		\textbf{Numbering example:}
		
		\begin{enumerate}[label={[}\arabic*{]}]
			\item Lejavitzer, A. (2016). Dieta saludable... \url{https://doi.org/10.19130/iifl.nt.2016.33.2.711}
			\item Guerra, C. (2023). Platón y la alimentación.
			\item Rocca, R. (2010). Tratamiento Sous vide.
		\end{enumerate}
		
	\end{multicols}
	
\end{document}