/* ============================================================
   Prompt Engineering for Production Systems
   HTML (bookdown::gitbook) stylesheet
   Typeface: EB Garamond (text) / JetBrains Mono (code)
   ============================================================ */

/*@import url('https://fonts.googleapis.com/css2?family=EB+Garamond:ital,wght@0,400;0,500;0,600;1,400;1,600&display=swap'); */

@import url('https://fonts.googleapis.com/css2?family=EB+Garamond:ital,wght@0,400;0,500;0,600;1,400;1,600&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --ink:        #1c1b19;
  --ink-soft:   #4a4843;
  --ink-faint:  #78756d;
  --paper:      #fdfdfb;
  --rule:       #d9d5cc;
  --rule-soft:  #eae7e0;

  --oxblood:    #7b2e20;
  --oxblood-bg: #fbf4f2;
  --slate:      #2a4a6b;
  --slate-bg:   #f2f5f8;
  --moss:       #2f5b3f;
  --moss-bg:    #f2f6f2;

  --serif: "EB Garamond", "Iowan Old Style", Georgia, "Times New Roman", serif;
  --mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
}

/* ---------- Body text ---------------------------------------------------- */

.book .book-body .page-wrapper .page-inner section.normal {
  font-family: var(--serif);
  font-size: 1.62rem;
  line-height: 1.62;
  color: var(--ink);
  background: var(--paper);
  hyphens: auto;
}

.book .book-body .page-wrapper .page-inner {
  max-width: 70em;
  padding-left: 24px;
  padding-right: 24px;
}

.book .book-body .page-wrapper .page-inner section.normal p {
  margin: 0 0 1.05em;
}

/* Indent successive paragraphs, book-style; first paragraph flush left. */
.book .book-body .page-wrapper .page-inner section.normal p + p {
  text-indent: 1.4em;
  margin-top: -0.35em;
}

.book .book-body .page-wrapper .page-inner section.normal strong { font-weight: 600; }

/* ---------- Headings ----------------------------------------------------- */

.book .book-body .page-wrapper .page-inner section.normal h1,
.book .book-body .page-wrapper .page-inner section.normal h2,
.book .book-body .page-wrapper .page-inner section.normal h3,
.book .book-body .page-wrapper .page-inner section.normal h4 {
  font-family: var(--serif);
  font-weight: 400;
  color: var(--ink);
  page-break-after: avoid;
}

/* Chapter title */
.book .book-body .page-wrapper .page-inner section.normal h1 {
  font-size: 3.3rem;
  text-align: center;
  line-height: 1.2;
  margin: 1.2em 0 0;
  padding: 0;
  border: none;
}

/* Hairline ornament under the chapter title */
.book .book-body .page-wrapper .page-inner section.normal h1::after {
  content: "";
  display: block;
  width: 3.2em;
  height: 1px;
  background: var(--rule);
  margin: 0.75em auto 1.6em;
}

.book .book-body .page-wrapper .page-inner section.normal h2 {
  font-size: 2rem;
  font-variant: small-caps;
  letter-spacing: 0.075em;
  margin: 2.4em 0 0.7em;
  padding: 0;
  border: none;
}

.book .book-body .page-wrapper .page-inner section.normal h3 {
  font-size: 1.5rem;
  font-style: italic;
  margin: 1.9em 0 0.5em;
}

/* ---------- Drop cap and incipit ----------------------------------------- */

.dropcap {
  float: left;
  font-family: var(--serif);
  font-size: 3.5em;
  line-height: 0.80;
  padding: 0.06em 0.08em 0 0;
  color: var(--ink);
}

.incipit {
  font-variant: small-caps;
  letter-spacing: 0.07em;
}

/* The paragraph carrying a drop cap is never indented. */
p:has(> .dropcap) { text-indent: 0 !important; }

/* ---------- Callout boxes ------------------------------------------------ */

.problem-box, .team-box, .takeaway-box {
  border: none;
  border-left: 2px solid;
  border-radius: 0;
  padding: 0.15em 0 0.15em 1.15em;
  margin: 1.9em 0;
  font-size: 0.97em;
}

.problem-box  { border-color: var(--oxblood); background: var(--oxblood-bg); }
.team-box     { border-color: var(--slate);   background: var(--slate-bg); }
.takeaway-box { border-color: var(--moss);    background: var(--moss-bg); }

.problem-box, .team-box, .takeaway-box {
  padding-right: 1.15em;
  padding-top: 0.9em;
  padding-bottom: 0.5em;
}

.problem-box p, .team-box p, .takeaway-box p { text-indent: 0 !important; }

/* Labels are injected as real text by book-filters.lua -- not as CSS
   ::before content, which never reaches the PDF and is unreliable on
   e-readers. */
p.box-label {
  margin: 0 0 0.45em;
  font-family: var(--serif);
  font-size: 0.78em;
  font-variant: small-caps;
  letter-spacing: 0.14em;
  font-weight: 600;
  text-indent: 0 !important;
}

.problem-box  p.box-label { color: var(--oxblood); }
.team-box     p.box-label { color: var(--slate); }
.takeaway-box p.box-label { color: var(--moss); }

/* ---------- Code --------------------------------------------------------- */

.book .book-body .page-wrapper .page-inner section.normal pre,
.book .book-body .page-wrapper .page-inner section.normal code {
  font-family: var(--mono);
  font-variant-ligatures: none;
}

.book .book-body .page-wrapper .page-inner section.normal code {
  font-size: 0.86em;
  background: var(--rule-soft);
  padding: 0.1em 0.32em;
  border-radius: 2px;
  color: var(--ink);
}

.book .book-body .page-wrapper .page-inner section.normal pre {
  font-size: 1.2rem;
  line-height: 1.5;
  background: #faf9f6;
  border: none;
  border-left: 2px solid var(--rule);
  border-radius: 0;
  padding: 0.9em 1.1em;
  margin: 1.5em 0;
  overflow-x: auto;
}

.book .book-body .page-wrapper .page-inner section.normal pre code {
  background: none;
  padding: 0;
  font-size: inherit;
}

/* ---------- Tables, quotes, lists ---------------------------------------- */

.book .book-body .page-wrapper .page-inner section.normal table {
  font-size: 0.95em;
  border-collapse: collapse;
  margin: 1.6em 0;
  width: 100%;
}

.book .book-body .page-wrapper .page-inner section.normal table th {
  font-weight: 400;
  font-variant: small-caps;
  letter-spacing: 0.06em;
  text-align: left;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--rule);
  padding: 0.45em 0.7em 0.45em 0;
}

.book .book-body .page-wrapper .page-inner section.normal table td {
  border: none;
  padding: 0.4em 0.7em 0.4em 0;
}

.book .book-body .page-wrapper .page-inner section.normal table tr:last-child td {
  border-bottom: 1px solid var(--ink);
}

.book .book-body .page-wrapper .page-inner section.normal blockquote {
  border-left: 1px solid var(--rule);
  color: var(--ink-soft);
  font-style: italic;
  padding-left: 1.2em;
  margin: 1.6em 0;
}

.book .book-body .page-wrapper .page-inner section.normal li { margin: 0.3em 0; }

/* Section break: markdown `***` renders as an <hr> */
.book .book-body .page-wrapper .page-inner section.normal hr {
  border: none;
  height: auto;
  text-align: center;
  margin: 2.2em 0;
  color: var(--ink-faint);
}
.book .book-body .page-wrapper .page-inner section.normal hr::before {
  content: "\00A7";
  font-family: var(--serif);
  font-size: 1.1em;
}

/* ---------- Copyright page ----------------------------------------------- */

.copyrightpage {
  font-size: 0.85em;
  color: var(--ink-soft);
  line-height: 1.55;
  border-top: 1px solid var(--rule-soft);
  border-bottom: 1px solid var(--rule-soft);
  padding: 1.2em 0;
  margin: 2em 0 2.5em;
}
.copyrightpage p { text-indent: 0 !important; margin: 0 0 0.5em; }

/* ---------- Chrome ------------------------------------------------------- */

.book .book-summary { font-family: var(--serif); font-size: 0.98em; }
.book .book-summary ul.summary li a { color: var(--ink-soft); }
.book .book-summary ul.summary li.active > a { color: var(--oxblood); font-weight: 600; }

/* ---------- Dark mode ---------------------------------------------------- */

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e6e3dc; --ink-soft: #b3aea3; --ink-faint: #8a857a;
    --paper: #16161a; --rule: #3a3934; --rule-soft: #2a2a2e;
    --oxblood: #c9836f; --oxblood-bg: #241c1a;
    --slate: #8fb3d4;   --slate-bg: #1a1f26;
    --moss: #8fbb9c;    --moss-bg: #191f1b;
  }
  .book .book-body .page-wrapper .page-inner section.normal pre { background: #1c1c20; }
  .book .book-body .page-wrapper .page-inner section.normal code { background: #26262b; }
}

/* ---------- Print (browser "Save as PDF") -------------------------------- */

@media print {
  .book .book-body .page-wrapper .page-inner section.normal { font-size: 11pt; }
  .problem-box, .team-box, .takeaway-box { break-inside: avoid; }
  pre { break-inside: avoid; }
}