Beamer Minimalist Math Lecture Slides

\documentclass[10pt, aspectratio=169]{beamer}

% --- Packages ---
\usepackage{amsmath, amssymb, amsthm, mathtools}
\usepackage{booktabs}
\usepackage{tikz}
\usetikzlibrary{calc, positioning, shapes.geometric, arrows.meta}
\usepackage[most]{tcolorbox}
\usepackage{colortbl}

% --- Color Palette ---
\definecolor{navy}{RGB}{30,41,59}       % #1E293B Primary Dark Slate
\definecolor{teal}{RGB}{14,116,144}     % #0E7490 Primary Accent Teal
\definecolor{amber}{RGB}{217,119,6}     % #D97706 Highlight Warm Amber
\definecolor{slate}{RGB}{100,116,139}   % #64748B Secondary Muted
\definecolor{bglight}{RGB}{248,250,252} % #F8FAFC Background Light
\definecolor{cardbg}{RGB}{241,245,249}  % #F1F5F9 Box Fill
\definecolor{cardborder}{RGB}{226,232,240} % #E2E8F0 Border
\definecolor{darktext}{RGB}{15,23,42}   % #0F172A Text Dark

% --- Beamer Theme Customization ---
\setbeamercolor{background canvas}{bg=bglight}
\setbeamercolor{normal text}{fg=darktext}
\setbeamercolor{frametitle}{fg=navy, bg=bglight}
\setbeamercolor{title}{fg=navy}
\setbeamercolor{subtitle}{fg=teal}
\setbeamercolor{author}{fg=slate}
\setbeamercolor{date}{fg=slate}

% Remove default navigation symbols
\setbeamertemplate{navigation symbols}{}

% Clean Minimalist Frame Title
\makeatletter
\setbeamertemplate{frametitle}{
  \vspace*{0.15cm}
  \begin{beamercolorbox}[wd=\paperwidth, ht=0.85cm, dp=0.15cm, leftskip=0.8cm, rightskip=0.8cm]{frametitle}
    \usebeamerfont{frametitle}{\color{navy}\bfseries\insertframetitle}
    \ifx\insertframesubtitle\@empty\else
      \par\vspace*{1pt}