Fluxograma com tikz e caixas com marcadores e cores desbotadas

Question

Como faço para criar com tikz (usando xelatex) um fluxograma contendo caixas, que possuem um título e até quatro marcadores (exceto a caixa vermelha no meio)? Consegui obter um fluxograma simples com meu humilde conhecimento de tikz, veja abaixo, mas gostaria que as caixas desbotassem sua cor de fundo na extremidade inferior, onde também não teriam borda (na extremidade inferior). Como posso fazer isso acontecer?

Bônus: como faço para que o suporte inferior atinja o pico em direção à caixa do meio?

\documentclass[oneside,a4paper]{article}

\usepackage{tikz, tikzscale} % to use flowchart + to scale
\usetikzlibrary{shapes.geometric,arrows,calc,positioning,decorations.pathreplacing,bending}
\tikzstyle{startstop} = [rectangle, rounded corners, minimum width=3cm, minimum height=1cm, text centered, draw=black, fill=red!20]
\tikzstyle{process} = [rectangle, minimum width=3cm, minimum height=1cm, text centered, draw=black, fill=blue!30]
\tikzstyle{process2} = [rectangle, minimum width=3cm, minimum height=1cm, text centered, draw=black, fill=orange!30]
\tikzstyle{process3} = [rectangle, minimum width=3cm, minimum height=1cm, text centered, draw=black, fill=green!30]
\tikzstyle{arrow} = [thick,->,>=stealth]

\begin{document}
\begin{tikzpicture}[transform shape, node distance=2cm] % mock flow chart

\node (start) [process, align=center] {Title Bla Bla};
\node (pro1) [process, right of=start, align=center, xshift=2cm] {Title Bla Bla};
\node (pro2) [process, right of=pro1, align=center, xshift=2cm] {Title Bla Bla};
\node (pro3) [process2, below of=start, align=center, yshift=-.5cm] {Title Bla Bla};
\node (pro4) [process2, below of=pro1, align=center, yshift=-.5cm] {Title Bla Bla};
\node (pro5) [process2, below of=pro2, yshift=-.5cm] {Title Bla Bla};
\node (main) [startstop, below of=pro4, yshift=-.5cm] {Title Bla Bla};
\node (pro6) [process3, below left=1cm and 1cm of main, align=center] {Title Bla Bla};
\node (pro7) [process3, below of=main, align=center] {Title Bla Bla};
\node (pro8) [process3, below right=1cm and 1cm of main, align=center] {Title Bla Bla};
\node (pro9) [process3, right of=pro8, align=center, xshift=2cm] {Title Bla Bla};

\draw [arrow] (start) -- (pro3);
\draw [arrow] (pro1.south) -- (pro3.north);
\draw [arrow] (pro1.south) -- (pro5.north);
\draw [arrow] (pro2.south) -- (pro5.north);
\draw [arrow] (pro2.south) -- (pro4.north);

\draw[decorate, decoration={brace, mirror, amplitude=10pt, raise=4pt}, yshift=-2cm] (pro3.south west) -- (pro5.south east);
\draw[decorate, decoration={brace, amplitude=10pt, raise=4pt}, yshift=4cm] (pro6.north west) -- (pro9.north east);

\end{tikzpicture}
\end{document}

Muito obrigado antecipadamente!

Answer 1

Veja, os seguintes MWE oferecem o que você gostaria de obter:

\documentclass[tikz,
               border=3mm,
               ]{standalone}
\usetikzlibrary{arrows.meta,
                decorations.pathreplacing,
                calligraphy,%had to be after lib. decorations.pathreplacing
                positioning,
                shadows
                }
\usepackage{enumitem}
\setlist{nosep,leftmargin=*}

\begin{document}
    \begin{tikzpicture}[
node distance = 22mm and 11mm,
   box/.style = {shape=rectangle, draw, thin, 
                 minimum height=10mm, text width=32mm, align=center,
                 top color=#1!20, bottom color=#1!80,
                 anchor=south west
                 },
BC/.style args = {#1/#2/#3}{% Braces Calligraphic
        decorate,
        decoration={calligraphic brace, amplitude=6pt,
        raise=#1,
              #2,% for mirroring of brace
        aspect=#3},
        very thick,
        pen colour={gray}
        },
                        ] % mock flow chart
 nodes, first row
\node (start) [box=blue] {\parbox{\hsize}{Title Bla Bla,
                            \begin{itemize}
                        \item   item 1
                        \item   item 2
                        \item   item 3
                            \end{itemize}}};
\node (pro1)  [right=of start.south east,box=blue] {Title Bla Bla,
                            \begin{itemize}
                        \item   item 1
                        \item   item 2
                            \end{itemize}};
\node (pro2)  [right=of pro1.south east,box=blue] {Title Bla Bla,
                            \begin{itemize}
                        \item   item 1
                            \end{itemize}};
% nodes, second row
\node (pro3)  [below=of start.south west,box=orange]    {Title Bla Bla};
\node (pro4)  [right=of pro3.south east,box=orange]     {Title Bla Bla};
\node (pro5)  [right=of pro4.south east,box=orange]     {Title Bla Bla};
% nodes, third row
\node (pro6)  [below=of pro4.south west,box=red,rounded corners] {Title Bla Bla};
% nodes, forth row
\node (pro7)  [below=of pro3.west |- pro6.south,
               box=green]                               {Title Bla Bla};
\node (pro8)  [right=of pro7.south east,box=green]      {Title Bla Bla};
\node (pro9)  [right=of pro8.south east,box=green]      {Title Bla Bla};
\node (pro10) [right=of pro9.south east,box=green]      {Title Bla Bla};
% connections
\draw[-Stealth] (start) edge (pro3)
                (pro1.south)  edge (pro3) (pro1.south)  edge (pro5)
                (pro2.south)  edge (pro4) (pro2.south)  edge (pro5);                
% braces
\draw[BC=2mm/mirror/0.500] (pro3.south west) -- (pro5.south east);
\draw[BC=2mm/      /0.375] (pro7.north west) -- (pro10.north east);
\end{tikzpicture}
\end{document}