Customize enumerate list counter with tikz node

Question

I am trying to make an enumerate list that should produce the list with tikz node and with automatic numbering e.g Problem 1:, Problem 1.1:, and Problem 2:.
I write the tikz code that only generates the single Problem by mentioning the number myself.
My code is as follows:
documentclass[a4paper, 12pt]{article}
usepackage{tikz}
usepackage[margin=1in]{geometry}

newcommand{tb}[1]{textbf{#1}}

tikzset{problem/.style={
        fill=red!10,
        text width=1textwidth-1cm, 
        rounded corners=0.2cm,
        inner sep=0.5cm,
        draw=red!60!black}
}

newcommand{problem}[1]
{
    noindenttikz node[problem](instructions) {#1};
    vspace{0.1cm}
}

begin{document}
    
    problem{tb{Problem 1:} Explain the term Least Significant Bit (LSB).}
    
    problem{tb{Problem 2:} Explain the term Most Significant Bit (MSB).}
    
    problem{tb{Problem 2.1:} Why MSB is used?}
    
    problem{tb{Problem 2.2:} Why LSB is used in x86 architecture?}
    
    problem{tb{Problem 3:} Assemble the given program and update the values of the registers after single step execution.}
    
end{document}

Its output is

How can I generate a similar list with enumerate environment with automatically numbering Problem 1:, Problem 1.1:, and Problem 2:, with the tikz node style (red background color and border)?

cis · Accepted Answer

I would do this by tcolorbox and two counters:

documentclass{article}
usepackage[showframe=false,
margin=1in]{geometry}
usepackage{varwidth}
usepackage[most]{tcolorbox}

newcounter{mainno}
newcounter{subno}
newenvironment{myenumerate}
        {setcounter{mainno}{0}setcounter{subno}{0}}{}

pgfmathsetlengthmacromysep{4mm}% 4mm = default of tcolorbox for left, right
tcbset{CommonStyle/.style={
boxrule=0.4pt, % default value TikZ
arc=3pt, 
colframe=red!60!black,   colback=red!10,
top=mysep, bottom=mysep,
left=mysep, right=mysep,       %boxsep=0mm, 
tcbox width=forced left,
beforeafter skip=1.125baselineskip, 
},
}

newtcbox{subbox}[1][]{CommonStyle, 
before upper={%
begin{varwidth}{dimexprlinewidth-mysep-myseprelax}%
stepcounter{subno}%
textbf{Problem themainno.thesubno:}~
},     
after upper=end{varwidth},    #1}

newtcbox{mainbox}[1][]{CommonStyle, 
before upper={%
begin{varwidth}{dimexprlinewidth-mysep-myseprelax}%
stepcounter{mainno}%
setcounter{subno}{0}%
textbf{Problem themainno:}~
},     
after upper=end{varwidth},   #1}

begin{document}
begin{myenumerate}
%  subbox{Sub item}
  mainbox{Main item}

mainbox{Main item} 
  subbox{Sub item}
  subbox{Sub item}

mainbox{Main item}
    subbox{Sub item. This ia a very long text. This ia a very long text. This ia a very long text. This ia a very long text.}
end{myenumerate}

%begin{myenumerate}
%  mainbox{Main item} 
%  subbox{Sub item}
%   subbox{Sub item}
%end{myenumerate}
end{document}

Customize enumerate list counter with tikz node

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