% !TeX program = pdflatex
\documentclass{mathreport} % Uses our custom mathreport.cls

% Load bibliography
\addbibresource{references.bib}
\usepackage{lipsum} % Just for the demo text

% --- Document Metadata ---
\title{\normalfont\scshape\Large The Geometry of Complex Systems}
\author{\normalfont\itshape A. N. Other}
\date{\small\today}

\begin{document}

\maketitle

\begin{abstract}
    \noindent \small \textbf{\textit{Abstract.}} \lipsum[1][1-4]
\end{abstract}

\section{Introduction}
This document uses a custom class file (\texttt{mathreport.cls}). This keeps the main file clean. The typography is set to Bringhurst's standards: wide margins, Palatino font, and old-style figures (e.g., 12345).

\section{Mathematical Theory}
We define our primary operator in the Hilbert space $\mathcal{H}$.

\begin{definition}[Compact Operator]
    An operator $T: X \to Y$ is compact if $\overline{T(B_X)}$ is compact in $Y$.
\end{definition}

\begin{theorem}[Spectral Theorem]
    There exists an orthonormal basis of eigenvectors.
\end{theorem}

Consider the harmonic series shown in \cref{eq:harmonic}. The styling is handled entirely by the external class file.
\begin{equation} \label{eq:harmonic}
    H_n = \sum_{k=1}^n \frac{1}{k} \approx \ln n + \gamma
\end{equation}

\section{Results and Discussion}
\lipsum[2-4]

\printbibliography

\end{document}