atlas_style.sty

\ProvidesPackage{atlas_style}[2026/02/20 Rosetta Stone Style for Deep Learning Math]

% --- 核心字体与编码 (XeLaTeX 兼容) ---
\RequirePackage{amsmath, amsfonts, amssymb}
\RequirePackage{newtxmath}   % 提供 Times 风格的数学符号
\RequirePackage{fontspec}    % XeLaTeX 字体引擎
\setmainfont{TeX Gyre Termes} % 高质量 Times 克隆字体，CI 环境兼容

% --- 核心宏包 ---
\RequirePackage{geometry}
\RequirePackage{graphicx}
\RequirePackage{xcolor}
\RequirePackage{caption}
\RequirePackage[many]{tcolorbox}
\tcbuselibrary{skins, breakable}
\RequirePackage{titlesec}
\RequirePackage{fancyhdr}
\RequirePackage{natbib}
\RequirePackage{hyperref}
\RequirePackage{bookmark}
\RequirePackage{tikz}
\usetikzlibrary{shapes.geometric, arrows.meta, positioning, shadows, fit, backgrounds, calc, decorations.pathmorphing}

% --- 配色定义 ---
\definecolor{maintheme}{RGB}{34, 107, 128}      % 深青色
\colorlet{MAINTHEME}{maintheme}                 % 别名，防止某些宏包自动大写导致错误
\definecolor{brandblue}{RGB}{0, 114, 178}       % 现代蓝
\definecolor{brandorange}{RGB}{213, 94, 0}      % 警告橙
\definecolor{brandgreen}{RGB}{0, 158, 115}      % 代码绿
\definecolor{softblue}{RGB}{235, 245, 250}
\definecolor{codegrey}{RGB}{245, 245, 245}
\definecolor{deepgrey}{RGB}{51, 51, 51}

% --- 页面几何设置 (不对称宽侧栏) ---
\geometry{
    a4paper,
    inner=2cm,
    outer=5cm,
    top=3cm,
    bottom=3cm,
    marginparsep=0.5cm,
    marginparwidth=4cm
}

\hypersetup{colorlinks=true, linkcolor=maintheme, citecolor=maintheme, urlcolor=brandblue}

% --- 段落排版 ---
\linespread{1.3}
\setlength{\parskip}{0.5em}
\setlength{\parindent}{0pt}

% --- 页眉页脚 ---
\pagestyle{fancy}
\fancyhf{}
\fancyhead[LE,RO]{\textcolor{gray}{\thepage}}
\fancyhead[LO]{\textcolor{gray}{\leftmark}}
\fancyhead[RE]{\textcolor{gray}{\rightmark}}
\renewcommand{\headrulewidth}{0.4pt}
\renewcommand{\headrule}{\hbox to\headwidth{\color{gray}\leaders\hrule\hfill}}

% --- 目录美化 ---
\RequirePackage{titletoc}
\renewcommand{\contentsname}{\hfill \huge\bfseries\color{maintheme} 目录 (Contents) \hfill}

\titlecontents{chapter}[0em]{\addvspace{1.5pc}\bfseries\color{maintheme}}
{\thecontentslabel\quad}{}
{\titlerule*[0.7pc]{.}\contentspage}

\titlecontents{section}[2em]{\addvspace{0.5pc}}
{\thecontentslabel\quad}{}
{\titlerule*[0.7pc]{.}\contentspage}

% --- 章节标题美化 ---
\titleformat{\chapter}[display]
  {\normalfont\Huge\bfseries\color{maintheme}}
  {\titlerule[2pt]\vspace{2pt}\titlerule\vspace{1ex}\chaptertitlename\ \thechapter}
  {1ex}
  {\Huge}
  [\vspace{1ex}\titlerule]

\titleformat{\section}
  {\normalfont\Large\bfseries\color{black}}
  {\color{maintheme}\thesection}{1em}{}

% --- 核心环境: 罗塞塔左右对照框 ---
\newtcolorbox{rosetta}[2][]{
    enhanced,
    sidebyside,
    sidebyside align=top,
    sidebyside gap=6mm,
    lower separated=true,
    halign=left,
    halign lower=center,
    colback=white,
    colframe=brandblue!30,
    colbacktitle=brandblue!10,
    coltitle=brandblue,
    fonttitle=\bfseries\sffamily,
    title=#2,
    sharp corners,
    boxrule=0.8pt,
    titlerule=0pt,
    drop fuzzy shadow,
    bicolor,
    colbacklower=codegrey,
    segmentation style={dash pattern=on 3pt off 2pt, brandblue!40, thick},
    #1
}

% --- 语义化扁平框 ---
\newtcolorbox{flatblue}[2][]{
    enhanced, breakable, sharp corners, boxrule=0pt, frame hidden,
    borderline west={3pt}{0pt}{brandblue},
    colback=softblue, coltitle=brandblue,
    fonttitle=\bfseries\large\sffamily, title=#2,
    attach title to upper, after title={\par\medskip},
    left=10pt, right=10pt, top=10pt, bottom=10pt, #1
}

% --- 旧版兼容环境 ---
\newtcolorbox{mathbox}[2][]{
    enhanced, breakable, colback=white, colframe=brandblue!20,
    colbacktitle=brandblue!5, coltitle=brandblue,
    fonttitle=\bfseries\large\sffamily, title=#2,
    attach boxed title to top left={yshift=-2mm, xshift=5mm},
    boxed title style={enhanced, boxrule=0.5pt, colframe=white, shadow={0.3mm}{-0.3mm}{0mm}{black!10!white}},
    shadow={0.5mm}{-0.5mm}{0mm}{black!10!white}, separator sign none,
    top=12pt, bottom=8pt, left=10pt, right=10pt, #1
}

% --- 核心命令 ---
\newcommand{\pyfunc}[1]{\texttt{\textbf{\textcolor{brandblue}{#1}}}}

% --- TikZ 样式库 (Edition 2.2 Standard) ---
\tikzset{
    neuron/.style={circle, draw=brandblue, fill=brandblue!10, minimum size=20pt, thick, drop shadow={opacity=0.2}},
    active_neuron/.style={circle, draw=brandorange, fill=brandorange!10, minimum size=20pt, thick, drop shadow={opacity=0.2}},
    data_node/.style={rectangle, draw=brandgreen, fill=brandgreen!5, rounded corners=2pt, minimum height=25pt, minimum width=40pt, thick},
    op_node/.style={circle, draw=brandorange, fill=brandorange!15, thick, inner sep=1pt, minimum size=18pt},
    block/.style={rectangle, draw=brandblue!80, fill=brandblue!5, thick, rounded corners, minimum width=3cm, minimum height=0.8cm, align=center, drop shadow={opacity=0.1}},
    norm_block/.style={rectangle, draw=brandgreen!80, fill=brandgreen!5, thick, rounded corners, minimum width=3cm, minimum height=0.8cm, align=center},
    attn_block/.style={rectangle, draw=brandorange!80, fill=brandorange!5, thick, rounded corners, minimum width=3cm, minimum height=0.8cm, align=center},
    conn/.style={->, >=Stealth, brandblue!60, thick},
    skip_conn/.style={->, >=Stealth, brandblue!40, thick, rounded corners=2mm},
    data_flow/.style={->, >=Stealth, brandgreen!70, thick},
    layer_label/.style={font=\sffamily\scriptsize\bfseries, color=deepgrey},
    math_text/.style={font=\small\itshape},
    container/.style={rectangle, draw=brandblue!30, fill=white, rounded corners=4pt, inner sep=10pt, dashed, thick},
    block_orange/.style={block, draw=brandorange, fill=brandorange!10},
    block_green/.style={block, draw=brandgreen, fill=brandgreen!10},
    arrow_blue/.style={->, >=Stealth, thick, draw=brandblue}
}

% --- Notation & Variable Environments ---
\RequirePackage{marginfix} % 自动修复边栏重叠
\newcommand{\mnote}[1]{\marginpar{\linespread{1.1}\footnotesize\sffamily\color{deepgrey}#1}}

\newtcolorbox{notation}[1][]{
    enhanced, breakable, sharp corners, boxrule=0pt, frame hidden,
    borderline west={3pt}{0pt}{brandblue},
    colback=softblue, coltitle=brandblue,
    fonttitle=\bfseries\large\sffamily, title={Notation},
    attach title to upper, after title={\par\medskip},
    left=10pt, right=10pt, top=10pt, bottom=10pt, #1
}

\newtcolorbox{variable}[1][]{
    enhanced, breakable, sharp corners, boxrule=0pt, frame hidden,
    borderline west={3pt}{0pt}{brandgreen},
    colback=brandgreen!5, coltitle=brandgreen,
    fonttitle=\bfseries\large\sffamily, title={Variable Explanation},
    attach title to upper, after title={\par\medskip},
    left=10pt, right=10pt, top=10pt, bottom=10pt, #1
}

\endinput