\whatsnote_provide_module:n { layout }

% \bool_if:NT \g__whatsnote_darkmode_bool
%   {
%     \pagecolor{black!90}
%     \hook_gput_code:nnn { env/document/before } { . }
%       { \color{gray!5}\global\let\default@color\current@color }
%   }

\def\@makechapterhead#1
  {
    \vspace*{ -25\p@ }
    {
      \parindent \z@ \raggedright \normalfont
      \int_compare:nNnT { \c@secnumdepth } > { \m@ne }
        {
          \if@mainmatter
            \parbox { 16ex }
              {
                \centering
                \@setfontsize\HUGE{30}{40} \normalfont\bfseries
                \textcolor{darkgray}{\thechapter}
                \vskip6\p@
                \normalsize \bfseries\sffamily\scshape
                \textcolor{darkgray}{\@chapapp}
              }
          \fi
        }
      \interlinepenalty\@M \hspace*{2.5ex}
      \parbox { \dim_eval:n { \linewidth - 21ex } } { \huge \bfseries #1 }
      \par\nobreak
      \vskip 45\p@
    }
  }

\def\@makeschapterhead#1
  {
    \renewcommand*{\thesection}{\arabic{section}}
    \renewcommand*{\theproblem}{\arabic{problem}}
    \setcounter{section}{0}
    \setcounter{problem}{0}
    \vspace*{-35\p@}
      {
        \centering
        \parindent \z@
        \normalfont
        \interlinepenalty\@M
        \huge \bfseries #1\par\nobreak
        \vskip 30\p@
      }
  }

\box_new:N \l__whats_left_box
\box_new:N \l__whats_right_box
\box_new:N \l__whats_seg_box
\keys_define:nn { whats / textfig }
  {
    lefthand~ratio .fp_set:N   = \l__whats_left_ratio_fp ,
    lefthand~ratio .initial:n  = .64 ,
    lefthand~width .dim_set:N  = \l__whats_left_dim ,
    righthand~ratio .fp_set:N  = \l__whats_right_ratio_fp ,
    righthand~ratio .initial:n = .32 ,
    righthand~width .dim_set:N = \l__whats_right_dim ,
    sidebyside~gap .dim_set:N  = \l__whats_gap_dim ,
    sidebyside~gap .initial:n  = .02\linewidth ,
    before~left .tl_set:N      = \l__whats_before_left_tl ,
    before~right .tl_set:N     = \l__whats_before_right_tl ,
  }
\cs_new_protected:Npn \textfigsplit
  {
    %% Width is too small! Abort!
    \dim_compare:nNnT \l__whats_right_dim > { 10sp }
      {
        \__whats_textfig_end_save:
        \__whats_textfig_save:NN \l__whats_right_box \l__whats_right_dim
        \l__whats_before_right_tl \ignorespaces
      }
  }
\NewDocumentEnvironment{textfig}{ O{} }
  {
    \medskip \keys_set:nn { whats / textfig } {#1}
    \__whats_calc_width: 
    \__whats_textfig_save:NN \l__whats_left_box \l__whats_left_dim
    \l__whats_before_left_tl \ignorespaces
  }
  {
    \__whats_textfig_end_save:
    \__whats_textfig_typeset:
    \medskip
  }
\cs_new:Npn \__whats_calc_width:
  {
    \bool_lazy_and:nnTF
      { \dim_compare_p:nNn \l__whats_left_dim = \c_zero_dim }
      { \dim_compare_p:nNn \l__whats_right_dim = \c_zero_dim }
      {
        \bool_lazy_and:nnTF
          { \fp_compare_p:nNn { abs ( \l__whats_left_ratio_fp ) } < { 0.0001 } }
          { \fp_compare_p:nNn { abs ( \l__whats_right_ratio_fp ) } < { 0.0001 } }
          {
            \dim_set:Nn \l__whats_left_dim { 0.5\linewidth - 0.5\l__whats_gap_dim }
            \dim_set:Nn \l__whats_right_dim { \l__whats_left_dim }
          }
          {
            \fp_compare:nNnTF { abs ( \l__whats_left_ratio_fp ) } < { 0.0001 }
              {
                \dim_set:Nn \l__whats_right_dim 
                  { 
                    \fp_use:N \l__whats_right_ratio_fp 
                    \dimexpr \linewidth - \l__whats_gap_dim \relax
                  }
                \dim_set:Nn \l__whats_left_dim 
                  { \linewidth - \l__whats_gap_dim - \l__whats_right_dim }
              }
              {
                \dim_set:Nn \l__whats_left_dim 
                  { 
                    \fp_use:N \l__whats_left_ratio_fp 
                    \dimexpr \linewidth - \l__whats_gap_dim \relax
                  }
                \dim_set:Nn \l__whats_right_dim 
                  { \linewidth - \l__whats_gap_dim - \l__whats_left_dim }
              }
          }
      }
      {
        \dim_compare:nNnTF \l__whats_left_dim = \c_zero_dim
          {
            \dim_set:Nn \l__whats_left_dim 
              { \linewidth - \l__whats_gap_dim - \l__whats_right_dim }
          }
          {
            \dim_set:Nn \l__whats_right_dim 
              { \linewidth - \l__whats_gap_dim - \l__whats_left_dim }
          }
      }
  }
\cs_new:Npn \__whats_textfig_save:NN #1 #2
  {
    \hbox_set:Nw #1
    \minipage {#2}
    \setlength{\parindent}{0pt}
  }
\cs_new:Npn \__whats_textfig_end_save:
  {
    \endminipage
    \hbox_set_end:
  }
\cs_new:Npn \__whats_textfig_typeset:
  {
    \hbox_to_wd:nn { \linewidth }
      {
        \hbox_unpack_drop:N \l__whats_left_box
        \hss
        \hbox_unpack_drop:N \l__whats_right_box
      }
  }

\RequirePackage{ tasks, multirow, multicol }
\settasks { label = \sffamily\Alph*., item-indent = 2.5em, label-offset = .5pt }

\RequirePackage[inline]{enumitem}

\RequirePackage{fancyhdr}

\endinput