/* md_to_pdf: structure and typography. All colour lives in themes/*.css. */

:root {
  --font-body: "Bitstream Charter", "Charter", "Noto Serif", Georgia, serif;
  --font-head: "Lato", "Noto Sans", "Helvetica Neue", sans-serif;
  --font-mono: "JetBrainsMono Nerd Font Mono", "JetBrains Mono", "Fira Code", monospace;
  --measure-leading: 1.55;
}

@page {
  size: letter;
  margin: 0.9in 1in 0.9in 1in;
  background: var(--bg);

  @top-right {
    content: string(doctitle);
    font-family: var(--font-head);
    font-size: 7.5pt;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--fg-faint);
    vertical-align: bottom;
    padding-bottom: 0.28in;
  }
  @bottom-right {
    content: counter(page);
    font-family: var(--font-head);
    font-size: 8.5pt;
    color: var(--fg-faint);
    vertical-align: top;
    padding-top: 0.3in;
  }
}

@page :first {
  @top-right { content: none; }
  @bottom-right { content: none; }
}

html {
  font-size: 10pt;
  background: var(--bg);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: var(--measure-leading);
  font-kerning: normal;
  font-variant-numeric: oldstyle-num proportional-nums;
  hyphens: auto;
  text-align: justify;
  text-justify: inter-word;
  orphans: 2;
  widows: 2;
}

/* ---------- title block ---------- */

.title-block {
  margin: 0 0 2.6rem;
  padding-bottom: 1.1rem;
  border-bottom: 2px solid var(--accent);
  text-align: left;
  hyphens: none;
}

.doc-title {
  string-set: doctitle content(text);
  font-family: var(--font-head);
  font-size: 2.35rem;
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.021em;
  color: var(--fg-strong);
  margin: 0;
  padding: 0;
  border: 0;
}

.doc-subtitle {
  font-family: var(--font-head);
  font-size: 1.16rem;
  font-weight: 300;
  line-height: 1.35;
  color: var(--fg-muted);
  margin: 0.55rem 0 0;
}

.doc-meta {
  font-family: var(--font-head);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin: 1.05rem 0 0;
  font-variant-numeric: normal;
}

.doc-meta .sep { padding: 0 0.35em; color: var(--accent); }

/* ---------- headings ---------- */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  color: var(--fg-strong);
  hyphens: none;
  text-align: left;
  break-after: avoid;
  break-inside: avoid;
  font-variant-numeric: normal;
}

h1 {
  font-size: 1.62rem;
  font-weight: 800;
  letter-spacing: -0.014em;
  line-height: 1.2;
  margin: 2.5rem 0 0.95rem;
  padding-bottom: 0.34rem;
  border-bottom: 1px solid var(--border);
}

h2 {
  font-size: 1.32rem;
  font-weight: 700;
  letter-spacing: -0.008em;
  line-height: 1.25;
  margin: 2rem 0 0.6rem;
}

h3 {
  font-family: var(--font-body);
  font-size: 1.12rem;
  font-style: italic;
  font-weight: 700;
  line-height: 1.3;
  margin: 1.5rem 0 0.45rem;
}

h4 {
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.075em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin: 1.3rem 0 0.35rem;
}

h5, h6 {
  font-size: 0.92rem;
  font-weight: 600;
  font-style: italic;
  color: var(--fg-muted);
  margin: 1.15rem 0 0.3rem;
}

:is(h1, h2, h3, h4, h5, h6) > .header-section-number {
  color: var(--accent);
  font-weight: 600;
  padding-right: 0.42em;
}

/* ---------- flow ---------- */

p { margin: 0 0 0.82rem; }

:is(h1, h2, h3, h4, h5, h6) + p { margin-top: 0; }

main > :first-child { margin-top: 0; }

a {
  color: var(--accent);
  text-decoration: none;
  overflow-wrap: break-word;
}

strong { font-weight: 700; color: var(--fg-strong); }
em { font-style: italic; }

del { color: var(--fg-muted); }

sup, sub { line-height: 0; font-size: 0.72em; }

abbr { letter-spacing: 0.04em; }

hr {
  border: 0;
  border-top: 1px solid var(--border);
  width: 22%;
  margin: 2rem auto;
}

/* ---------- lists ---------- */

ul, ol { margin: 0 0 0.82rem; padding-left: 1.45rem; }
li { margin: 0.16rem 0; }
li > ul, li > ol { margin: 0.16rem 0 0.3rem; }

ul { list-style: none; }
ul > li { position: relative; }
ul > li::before {
  content: "\2013";
  position: absolute;
  left: -1.1rem;
  color: var(--accent);
  font-weight: 700;
}
ul ul > li::before { content: "\00B7"; }
ul ul ul > li::before { content: "\2013"; opacity: 0.55; }

ol { list-style: decimal; padding-left: 1.75rem; }
ol > li::marker { color: var(--accent); font-family: var(--font-head); font-weight: 600; font-size: 0.9em; }

/* task lists */
ul.task-list input[type="checkbox"] { display: none; }

ul.task-list > li::before {
  content: "";
  display: inline-block;
  position: static;
  width: 0.6em;
  height: 0.6em;
  margin: 0 0.5em 0 -1.1em;
  border: 1.1px solid var(--fg-faint);
  border-radius: 2px;
}

ul.task-list > li:has(input:checked)::before {
  background: var(--accent);
  border-color: var(--accent);
}

dl { margin: 0 0 0.82rem; }
dt {
  font-weight: 700;
  color: var(--fg-strong);
  margin-top: 0.6rem;
  hyphens: none;
}
dd { margin: 0.1rem 0 0.4rem 1.35rem; color: var(--fg-muted); }

/* ---------- quotes ---------- */

blockquote {
  margin: 1.1rem 0;
  padding: 0.15rem 0 0.15rem 1.15rem;
  border-left: 2.5px solid var(--quote-bar);
  color: var(--quote-fg);
  break-inside: avoid;
}

blockquote > :last-child { margin-bottom: 0; }
blockquote blockquote { margin: 0.7rem 0; opacity: 0.88; }

/* ---------- code ---------- */

code, kbd, samp {
  font-family: var(--font-mono);
  font-size: 0.855em;
  font-variant-ligatures: none;
  font-variant-numeric: lining-nums tabular-nums;
}

:not(pre) > code {
  background: var(--inline-code-bg);
  color: var(--inline-code-fg);
  font-size: 0.82em;
  padding: 0.08em 0.3em;
  border-radius: 3px;
  overflow-wrap: break-word;
}

pre {
  background: var(--code-bg);
  color: var(--code-fg);
  border: 1px solid var(--code-border);
  border-radius: 5px;
  padding: 0.72rem 0.9rem;
  margin: 1.05rem 0;
  line-height: 1.48;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  tab-size: 4;
  hyphens: none;
  text-align: left;
  orphans: 2;
  widows: 2;
}

pre > code {
  background: none;
  padding: 0;
  border-radius: 0;
  font-size: 0.845rem;
  color: inherit;
}

/* pandoc highlight classes */
pre code span.co, pre code span.do { color: var(--hl-comment); font-style: italic; }
pre code span.kw, pre code span.cf { color: var(--hl-keyword); font-weight: 600; }
pre code span.st, pre code span.ss, pre code span.vs, pre code span.ch, pre code span.sc { color: var(--hl-string); }
pre code span.dv, pre code span.bn, pre code span.fl { color: var(--hl-number); }
pre code span.fu { color: var(--hl-function); }
pre code span.dt, pre code span.at { color: var(--hl-type); }
pre code span.va { color: var(--hl-variable); }
pre code span.op { color: var(--hl-operator); }
pre code span.cn, pre code span.bu, pre code span.ex { color: var(--hl-builtin); }
pre code span.im, pre code span.pp { color: var(--hl-preproc); }
pre code span.an, pre code span.cv, pre code span.in { color: var(--hl-comment); }
pre code span.al, pre code span.er { color: var(--hl-error); font-weight: 600; }
pre code span.wa { color: var(--hl-error); font-style: italic; }

/* ---------- tables ---------- */

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2rem 0;
  font-size: 0.93rem;
  font-variant-numeric: lining-nums tabular-nums;
  hyphens: none;
  text-align: left;
  break-inside: auto;
}

thead { display: table-header-group; }
tr { break-inside: avoid; }

thead th {
  font-family: var(--font-head);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-muted);
  background: var(--table-head-bg);
  border-top: 1.4px solid var(--fg-faint);
  border-bottom: 1.4px solid var(--fg-faint);
  padding: 0.5rem 0.6rem;
  vertical-align: bottom;
}

tbody td {
  padding: 0.42rem 0.6rem;
  border-bottom: 1px solid var(--border-faint);
  vertical-align: top;
}

tbody tr:last-child td { border-bottom: 1.4px solid var(--fg-faint); }

caption {
  caption-side: bottom;
  font-size: 0.85rem;
  font-style: italic;
  color: var(--fg-muted);
  padding-top: 0.5rem;
  text-align: left;
}

/* ---------- figures ---------- */

img { max-width: 100%; height: auto; border-radius: 4px; }

figure {
  margin: 1.4rem 0;
  text-align: center;
  break-inside: avoid;
}

figcaption {
  font-size: 0.85rem;
  font-style: italic;
  color: var(--fg-muted);
  margin-top: 0.5rem;
  text-align: center;
}

/* ---------- table of contents ---------- */

#TOC {
  margin: 0 0 2.4rem;
  padding: 0 0 1.4rem;
  border-bottom: 1px solid var(--border);
  hyphens: none;
  text-align: left;
  break-after: page;
}

#TOC .toc-title {
  font-family: var(--font-head);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin: 0 0 0.85rem;
}

#TOC ul { list-style: none; padding-left: 0; margin: 0; }
#TOC ul ul { padding-left: 1.15rem; }
#TOC li { margin: 0.14rem 0; }
#TOC li::before { content: none; }

#TOC a {
  color: var(--fg);
  font-family: var(--font-head);
  font-size: 0.9rem;
}

#TOC > ul > li > a { font-weight: 700; }
#TOC ul ul a { color: var(--fg-muted); font-size: 0.85rem; }

#TOC a::after {
  content: leader(". ") target-counter(attr(href), page);
  color: var(--fg-faint);
  font-size: 0.82rem;
  font-variant-numeric: lining-nums;
}

/* ---------- footnotes ---------- */

.footnote-ref { text-decoration: none; color: var(--accent); font-weight: 600; }

.footnotes {
  margin-top: 2.4rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--border);
  font-size: 0.87rem;
  color: var(--fg-muted);
}

.footnotes hr { display: none; }
.footnotes ol { padding-left: 1.45rem; }
.footnotes li::marker { color: var(--fg-faint); font-weight: 400; font-variant-numeric: lining-nums; }
.footnotes p { margin-bottom: 0.35rem; }
.footnotes .footnote-back { color: var(--fg-faint); font-weight: 400; padding-left: 0.3em; }