\documentclass[11pt,a4paper]{article}

% --- Encoding & Language ---
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[english]{babel}

% --- Page Layout ---
\usepackage[margin=2.5cm, headheight=14pt]{geometry}
\usepackage{setspace}
\onehalfspacing

% --- Mathematics Support ---
\usepackage{amsmath,amssymb,amsfonts}

% --- Headers & Footers ---
\usepackage{fancyhdr}
\pagestyle{fancy}
\fancyhf{}

% --- Workshop Header Customization ---
\lhead{\textbf{\small Workshop\_AMCD\_RO}}
\rhead{\small November 28-29, 2026}
\cfoot{\thepage}
\renewcommand{\headrulewidth}{0.8pt} % Line under header

% Force header on title page (redefines plain style used by \maketitle)
\fancypagestyle{plain}{
  \fancyhf{}
  \lhead{\textbf{\small Workshop\_AMCD\_RO}}
  \rhead{\small November 28-29, 2026}
  \cfoot{\thepage}
  \renewcommand{\headrulewidth}{0.8pt}
}

% --- Hyperlinks ---
\usepackage[colorlinks=true, linkcolor=blue, citecolor=blue, urlcolor=blue]{hyperref}

% --- Title & Authors ---
\title{\vspace{-1cm}\textbf{\Large Abstract Title}\\[0.3cm]
\large Subtitle or Specific Research Topic}

\author{
    \textbf{First Name Last Name}$^{1}$, \textbf{First Name Last Name}$^{2}$ \\[0.2cm]
    $^{1}$Laboratory Name, University / Institution, Country\\
    $^{2}$Laboratory Name, University / Institution, Country\\[0.2cm]
    \small Email: \href{mailto:author@domain.org}{author@domain.org}
}

\date{} % Omit date under title (already in header)

\begin{document}

\maketitle
\thispagestyle{fancy} % Ensures header displays on page 1

\vspace{-0.5cm}

\begin{abstract}
\noindent
Insert the abstract text here. This abstract should concisely present the background, the optimization or decision problem under study, the mathematical model or solution approach proposed (exact method, metaheuristics, etc.), as well as a summary of the key findings or future research directions.

\vspace{0.5cm}
\noindent\textbf{Keywords:} Operations Research, Combinatorial Optimization, Mathematical Modeling.
\end{abstract}

% --- Short Bibliography (Optional) ---
\begin{thebibliography}{9}
\bibitem{ref1}
Author, A., \& Author, B. (2026). Title of the reference paper. \textit{Journal Name}, 10(2), 120-135.
\end{thebibliography}

\end{document}