% ===== ElegantBook customizations for 《AI 에이전트를 깊이 이해하기》 =====

% ── Unicode glyph fallback (Times/Courier lack these) ─────────────
\usepackage{newunicodechar}
\IfFontExistsTF{Arial Unicode MS}{\newfontfamily\fallbackfont{Arial Unicode MS}}{\IfFontExistsTF{DejaVu Sans}{\newfontfamily\fallbackfont{DejaVu Sans}}{\newfontfamily\fallbackfont{Noto Sans CJK KR}}}
\newunicodechar{★}{{\fallbackfont ★}}
\newunicodechar{✓}{{\fallbackfont ✓}}
\newunicodechar{✗}{{\fallbackfont ✗}}
% Render U+2015 with a CJK-aware fallback because Latin Modern omits it.
\newunicodechar{―}{{\fallbackfont ―}}
\newunicodechar{₀}{{\fallbackfont ₀}}
\newunicodechar{₁}{{\fallbackfont ₁}}
\newunicodechar{₂}{{\fallbackfont ₂}}
\newunicodechar{₃}{{\fallbackfont ₃}}
\newunicodechar{₄}{{\fallbackfont ₄}}
\newunicodechar{₅}{{\fallbackfont ₅}}
\newunicodechar{₆}{{\fallbackfont ₆}}
\newunicodechar{₇}{{\fallbackfont ₇}}
\newunicodechar{₈}{{\fallbackfont ₈}}
\newunicodechar{₉}{{\fallbackfont ₉}}
\newunicodechar{ⓐ}{{\fallbackfont ⓐ}}
\newunicodechar{ⓑ}{{\fallbackfont ⓑ}}
\newunicodechar{ⓒ}{{\fallbackfont ⓒ}}
\newunicodechar{ⓓ}{{\fallbackfont ⓓ}}
\newunicodechar{ⓔ}{{\fallbackfont ⓔ}}
% Math / symbols absent from the Latin text font
\newunicodechar{≈}{{\fallbackfont ≈}}
\newunicodechar{♠}{{\fallbackfont ♠}}
\newunicodechar{♣}{{\fallbackfont ♣}}
\newunicodechar{♥}{{\fallbackfont ♥}}
\newunicodechar{♦}{{\fallbackfont ♦}}
% Greek letters used inline in body text (Latin Modern lacks them here)
\newunicodechar{α}{{\fallbackfont α}}
\newunicodechar{β}{{\fallbackfont β}}
\newunicodechar{γ}{{\fallbackfont γ}}
\newunicodechar{δ}{{\fallbackfont δ}}
\newunicodechar{ε}{{\fallbackfont ε}}
\newunicodechar{η}{{\fallbackfont η}}
\newunicodechar{θ}{{\fallbackfont θ}}
\newunicodechar{λ}{{\fallbackfont λ}}
\newunicodechar{μ}{{\fallbackfont μ}}
\newunicodechar{π}{{\fallbackfont π}}
\newunicodechar{ρ}{{\fallbackfont ρ}}
\newunicodechar{σ}{{\fallbackfont σ}}
\newunicodechar{τ}{{\fallbackfont τ}}
\newunicodechar{φ}{{\fallbackfont φ}}
\newunicodechar{ω}{{\fallbackfont ω}}

% ── Code/monospace font (covers box-drawing glyphs used in code) ──
\IfFontExistsTF{Menlo}{\setmonofont[Scale=0.86]{Menlo}}{\setmonofont[Scale=0.86]{DejaVu Sans Mono}}

% Korean word boundaries are meaningful. xeCJK defaults to discarding spaces
% between CJK characters and adding spacing at CJK/Latin boundaries because
% that is conventional for Chinese text. Preserve only the source spacing.
\xeCJKsetup{AutoFallBack=true,CJKspace=true,CJKecglue={},xCJKecglue=false}

% ── tcolorbox (ElegantBook already loads it; just add libraries) ──
\tcbuselibrary{skins,breakable}

% ── TikZ (for the full-bleed image cover in cover.tex) ───────────
\usepackage{tikz}

% Theme accent color: use a deep navy
% (classic, authoritative technical-book tone). Drives headings, rules, links,
% code chrome and the cover. Tweak this one line to restyle the whole book.
\definecolor{structurecolor}{RGB}{30,58,107}

% Accent shade for code/figure chrome (follows the theme color above)
\colorlet{accent}{structurecolor}

% Internal cross-reference links (그림 N-M / 제N장) — clickable + subtle navy,
% independent of the document class's global linkcolor. Used by crossref.lua.
\newcommand{\crossreflink}[2]{\hyperref[#1]{\textcolor{structurecolor}{#2}}}
\colorlet{accentbg}{structurecolor!6}
\colorlet{accentrule}{structurecolor!35}

% ── Wrap long lines in code blocks ───────────────────────────────
% pandoc emits fancyvrb's Verbatim (via `Highlighting` for ```lang blocks
% and plain `verbatim` for un-tagged blocks); neither wraps by default, so
% long lines overflow the page. fvextra adds breaklines; re-define both
% environments to wrap, breaking mid-token when a chunk has no spaces (URLs,
% long identifiers, CJK comments). An accent-colored ↳ marks each continued line.
\usepackage{fvextra}
\fvset{breaklines=true,breakanywhere=true,%
  breaksymbolleft={\footnotesize\textcolor{accentrule}{$\hookrightarrow$}\,}}
\DefineVerbatimEnvironment{Highlighting}{Verbatim}{commandchars=\\\{\},breaklines,breakanywhere}

% ── Code blocks: subtle O'Reilly-style framed box ────────────────
% One shared box style for ALL code blocks so highlighted (```lang → Shaded)
% and plain (``` → verbatim) blocks look identical. The plain verbatim nests
% a fvextra Verbatim inside the box; \VerbatimEnvironment makes it end at
% \end{verbatim} (the outer env name) rather than \end{Verbatim}.
\newtcolorbox{codebox}{%
  breakable, enhanced,
  colback=black!3, colframe=accentrule,
  boxrule=0.5pt, leftrule=2.5pt,
  left=0.7em, right=0.6em, top=0.4em, bottom=0.4em,
  arc=0.6mm,
  before skip=0.7em, after skip=0.7em
}
\renewenvironment{Shaded}{\begin{codebox}}{\end{codebox}}
\renewenvironment{verbatim}%
  {\VerbatimEnvironment\begin{codebox}\begin{Verbatim}}%
  {\end{Verbatim}\end{codebox}}

% ── Experiment & question callouts (used by experiment_box.lua) ───
\newtcolorbox{experimentbox}{
  breakable, enhanced,
  colback=accentbg, colframe=accent,
  boxrule=0.6pt, left=0.8em, right=0.8em, top=0.6em, bottom=0.6em,
  arc=1mm, before skip=0.9em, after skip=0.9em
}

\newtcolorbox{questionbox}{
  breakable, enhanced,
  colback=accentbg, colframe=accent,
  boxrule=0.8pt, left=0.9em, right=0.9em, top=0.9em, bottom=0.7em,
  arc=1.2mm, before skip=0.9em, after skip=0.9em
}

% ── Figures: force [H] so they can sit inside callout/quote boxes ─
\usepackage{float}
\let\origfigure\figure
\let\origendfigure\endfigure
\renewenvironment{figure}[1][htbp]{\origfigure[H]}{\origendfigure}
\setkeys{Gin}{width=\linewidth,height=0.38\textheight,keepaspectratio}

% ── Figure captions: manual numbering in text, so suppress label ──
\usepackage{caption}
% Keep Korean glyphs at the nominal caption size and use a synthetic bold
% where the installed CJK family does not provide one.
\IfFontExistsTF{Noto Sans CJK KR}{\setCJKfamilyfont{capcjksf}[AutoFakeBold=2.5]{Noto Sans CJK KR}}{\IfFontExistsTF{Apple SD Gothic Neo}{\setCJKfamilyfont{capcjksf}[AutoFakeBold=2.5]{Apple SD Gothic Neo}}{\setCJKfamilyfont{capcjksf}[AutoFakeBold=2.5]{DejaVu Sans}}}
\DeclareCaptionFont{cjkmatch}{\CJKfamily{capcjksf}}
\captionsetup{font={normalsize,sf,bf,cjkmatch}, labelformat=empty, skip=4pt, justification=centering}

% ── Blockquotes: accent left bar (experiments render as quotes) ──
\renewenvironment{quote}{%
  \begin{tcolorbox}[
    blanker, breakable,
    borderline west={2.5pt}{0pt}{accent},
    colback=accent!4,
    left=1em, right=0.6em, top=0.5em, bottom=0.5em,
    before skip=0.6em, after skip=0.6em
  ]%
}{%
  \end{tcolorbox}%
}

% ── Paragraph indentation ────────────────────────────────────────
\setlength{\parindent}{2em}

% Prefer the Korean Noto CJK families in CI. macOS system fonts provide a
% local fallback for contributors who do not have the Noto casks installed.
\IfFontExistsTF{Noto Serif CJK KR}{%
  \setCJKmainfont[AutoFakeBold=2.5]{Noto Serif CJK KR}%
  \setCJKsansfont[AutoFakeBold=2.5]{Noto Sans CJK KR}%
  \setCJKmonofont[AutoFakeBold=2.5]{Noto Sans CJK KR}%
}{\IfFontExistsTF{Noto Sans CJK KR}{%
  \setCJKmainfont[AutoFakeBold=2.5]{Noto Sans CJK KR}%
  \setCJKsansfont[AutoFakeBold=2.5]{Noto Sans CJK KR}%
  \setCJKmonofont[AutoFakeBold=2.5]{Noto Sans CJK KR}%
}{%
  \setCJKmainfont[AutoFakeBold=2.5]{AppleMyungjo}%
  \setCJKsansfont[AutoFakeBold=2.5]{Apple SD Gothic Neo}%
  \setCJKmonofont[AutoFakeBold=2.5]{Apple SD Gothic Neo}%
}}

% The Korean text intentionally preserves Simplified Chinese in translation
% examples and proper names. Korean-only macOS fonts omit some of those glyphs,
% so register an SC family after the primary families instead of silently
% dropping characters. CI installs Noto Sans CJK SC; Songti SC and PingFang SC
% cover contributors using the macOS system-font fallback above.
\IfFontExistsTF{Noto Sans CJK SC}{%
  \setCJKfallbackfamilyfont{\CJKrmdefault}[AutoFakeBold=2.5]{Noto Sans CJK SC}%
  \setCJKfallbackfamilyfont{\CJKsfdefault}[AutoFakeBold=2.5]{Noto Sans CJK SC}%
  \setCJKfallbackfamilyfont{\CJKttdefault}[AutoFakeBold=2.5]{Noto Sans CJK SC}%
}{\IfFontExistsTF{Songti SC}{%
  \setCJKfallbackfamilyfont{\CJKrmdefault}[AutoFakeBold=2.5]{Songti SC}%
  \setCJKfallbackfamilyfont{\CJKsfdefault}[AutoFakeBold=2.5]{Songti SC}%
  \setCJKfallbackfamilyfont{\CJKttdefault}[AutoFakeBold=2.5]{Songti SC}%
}{\IfFontExistsTF{PingFang SC}{%
  \setCJKfallbackfamilyfont{\CJKrmdefault}[AutoFakeBold=2.5]{PingFang SC}%
  \setCJKfallbackfamilyfont{\CJKsfdefault}[AutoFakeBold=2.5]{PingFang SC}%
  \setCJKfallbackfamilyfont{\CJKttdefault}[AutoFakeBold=2.5]{PingFang SC}%
}{}}}

% ElegantBook has no Korean locale, so lang=cn supplies CJK typesetting.
% Override its chapter wrapper directly; ctex heading keys are not enabled by
% ElegantBook's scheme=plain setup.
\renewcommand{\xchaptertitle}{제\thechapter 장}
\AtBeginDocument{\renewcommand{\contentsname}{목차}}

% ElegantBook empties the `plain` page style used on chapter-opening pages.
% Keep those pages numbered, matching the centered footer on regular pages.
\fancypagestyle{plain}{%
  \fancyhf{}%
  \fancyfoot[C]{\color{structurecolor}\small\thepage}%
  \renewcommand{\headrulewidth}{0pt}%
  \renewcommand{\footrulewidth}{0pt}%
}