/* ————— The session notes, set as a typeset chapter —————
   Modelled on the MATH S4061 handbook (analysisnotes.sty): a bold kicker over a
   large roman title, a course line divided by a thin rule, an optional epigraph,
   a ruled "Contents of this session" strip, and an "Overview." run-in — then a
   justified reading column with bold upright headings and small, indented
   captions.

   The site chrome (navbar, sidebar, TOC) stays in the house sans/mono; only the
   reading column becomes a book page. Two serifs are offered — Latin Modern
   Roman (default; matches the KaTeX math and the PDF) and Palatino — switched by
   the reader via the type toggle, which stamps data-notes-font on <html>.

   Every colour is a theme token (--ink, --hairline, --graphite, --accent), so
   the page follows the site's light and dark themes. */

@font-face {
  font-family: "Latin Modern Roman";
  src: url("fonts/lmroman10-regular.otf") format("opentype");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Latin Modern Roman";
  src: url("fonts/lmroman10-bold.otf") format("opentype");
  font-weight: 700; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Latin Modern Roman";
  src: url("fonts/lmroman10-italic.otf") format("opentype");
  font-weight: 400; font-style: italic; font-display: swap;
}
@font-face {
  font-family: "Latin Modern Roman";
  src: url("fonts/lmroman10-bolditalic.otf") format("opentype");
  font-weight: 700; font-style: italic; font-display: swap;
}

:root {
  --notes-serif: "Latin Modern Roman", "Computer Modern", Georgia, serif;
  --notes-measure: 46rem;
  --notes-indent: 1.6em;   /* the handbook's \adjustwidth{1.6em}{0pt} */
}
:root[data-notes-font="palatino"] {
  --notes-serif: "Palatino", "Palatino Linotype", "Book Antiqua", "URW Palladio L", "P052", Georgia, serif;
}

/* ————— the reading column ————— */

main.content,
#title-block-header {
  font-family: var(--notes-serif, Georgia, serif);
  max-width: var(--notes-measure);
}

main.content {
  font-size: 1.14rem;
  line-height: 2;      /* double-spaced, matching the PDF */
}

main.content p {
  text-align: justify;
  hyphens: auto;
  -webkit-hyphens: auto;
}

/* ————— chapter opener —————
   Built by notes-chapter-opener.html from metadata Quarto already emits;
   the stock Author / Published grid is replaced by the course line. */

#title-block-header.quarto-title-block {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

/* The stock Author / Published grid and the raw subtitle are folded into the
   kicker and course line instead. Quarto's own rule for .quarto-title-meta is
   more specific than this one, hence !important; both are scoped to the flag
   the opener script sets, so a page without JS still shows Quarto's title
   block rather than a title with no metadata at all. */
:root[data-notes-opener] #title-block-header .quarto-title-meta,
:root[data-notes-opener] #title-block-header .subtitle {
  display: none !important;
}

#title-block-header .nw-kicker {
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.015em;
  text-transform: uppercase;
  color: var(--ink, #14161a);
  margin: 0 0 0.95rem;
}

#title-block-header .title {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: 0;
  hyphens: none;
  -webkit-hyphens: none;
  margin: 0;
}

/* course name ▏ strand — the handbook's \midbar metadata line */
#title-block-header .nw-course {
  font-size: 1.16rem;
  text-align: left;
  margin: 1.05rem 0 0;
  color: var(--ink, #14161a);
}
#title-block-header .nw-course .midbar {
  display: inline-block;
  width: 1px;
  height: 1.05em;
  background: currentColor;
  opacity: 0.7;
  margin: 0 0.6em;
  vertical-align: -0.16em;
}

#title-block-header .nw-date {
  font-size: 1rem;
  text-align: left;
  margin: 0.5rem 0 0;
  color: var(--ink, #14161a);
}

/* epigraph: right-hand block, italic, small-caps attribution */
.nw-epigraph {
  width: 66%;
  margin: 1.4rem 0 1.6rem auto;
  font-size: 0.95rem;
  line-height: 1.5;
}
.nw-epigraph p {
  font-style: italic;
  text-align: left;
  margin: 0;
}
.nw-epigraph cite {
  display: block;
  margin-top: 0.5em;
  text-align: right;
  font-style: normal;
  font-size: 0.86rem;
  font-variant-caps: small-caps;
  letter-spacing: 0.035em;
}

/* "Contents of this session": small-caps label between two hairlines */
.nw-contents {
  margin: 1.5rem 0 0;
  font-size: 0.97rem;
}
.nw-contents .lab {
  display: block;
  font-variant-caps: small-caps;
  letter-spacing: 0.045em;
  margin-bottom: 0.3rem;
  color: var(--ink, #14161a);
}
.nw-contents ol {
  list-style: none;
  margin: 0;
  padding: 0.6rem 0 0.65rem var(--notes-indent);
  border-top: 1px solid var(--ink, #14161a);
  border-bottom: 1px solid var(--ink, #14161a);
}
.nw-contents li {
  display: flex;
  gap: 1.1em;
  margin: 0 0 0.2rem;
}
.nw-contents li:last-child { margin-bottom: 0; }
.nw-contents .n {
  flex: 0 0 auto;
  min-width: 2.1em;
}
.nw-contents-plain .n { display: none; }
.nw-contents a {
  color: inherit;
  text-decoration: none;
}
.nw-contents a:hover {
  color: var(--accent, #002fa7);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* the type toggle sits under the contents strip, as page apparatus */
.notes-font-toggle {
  display: flex;
  gap: 0.45rem;
  align-items: baseline;
  font-family: var(--font-mono, "IBM Plex Mono", ui-monospace, monospace);
  font-size: 0.72rem;
  color: var(--graphite, #575b64);
  margin-top: 0.75rem;
}
.notes-font-toggle .lab { letter-spacing: 0.1em; text-transform: uppercase; }
.notes-font-toggle button {
  font: inherit;
  background: none;
  border: 1px solid var(--hairline, #e7e8eb);
  border-radius: 999px;
  padding: 0.1rem 0.6rem;
  color: var(--graphite, #575b64);
  cursor: pointer;
}
.notes-font-toggle button[aria-pressed="true"] {
  border-color: var(--accent, #002fa7);
  color: var(--accent, #002fa7);
}

/* ————— headings: bold, upright, black numbers —————
   The handbook sets every heading in bold roman and hangs the wrapped line
   under the title, never under the number. Nothing is italic, nothing tinted. */

main.content :is(h1, h2, h3, h4) {
  font-family: var(--notes-serif, Georgia, serif);
  font-weight: 700;
  font-style: normal;
  letter-spacing: 0;
  hyphens: none;
  -webkit-hyphens: none;
}

main.content h2 {
  font-size: 1.6rem;
  line-height: 1.18;
  margin: 2.7rem 0 0.55rem;
  padding-left: 1.75em;
  text-indent: -1.75em;
  border-bottom: none;
}

main.content h3 {
  font-size: 1.24rem;
  line-height: 1.25;
  margin: 1.9rem 0 0.4rem;
  font-style: normal;
  font-weight: 700;
  padding-left: 2.1em;
  text-indent: -2.1em;
}

main.content h4 {
  font-size: 1.08rem;
  margin: 1.4rem 0 0.3rem;
}

main.content .header-section-number {
  color: inherit;
  font-weight: 700;
  margin-right: 0.85em;
}

/* ————— figures and captions —————
   \textbf{Figure 1.} then the caption text, footnote-size, in a block 86% of
   the measure — the handbook's Fig environment. */

main.content figure,
main.content .quarto-float {
  margin: 1.9rem 0;
}

main.content figure img,
main.content .quarto-float img {
  display: block;
  margin-inline: auto;
  max-width: 100%;
}

/* The TikZ figures are drawn to the width of the printed measure, so their
   intrinsic size is in points and the browser would otherwise render them at
   roughly half the reading column. They are vector, so scaling is free. */
main.content figure img[src$=".svg"],
main.content .quarto-float img[src$=".svg"] {
  width: 100%;
  height: auto;
}

main.content figcaption,
main.content .quarto-float-caption {
  font-family: var(--notes-serif, Georgia, serif);
  font-size: 0.87rem;
  line-height: 1.45;
  width: 86%;
  margin-inline: auto;
  text-align: left;
  color: var(--ink, #14161a);
}
main.content .quarto-float-caption-top { margin-bottom: 0.55rem; }
main.content .quarto-float-caption-bottom { margin-top: 0.6rem; }

main.content .nw-caplabel { font-weight: 700; }

/* the caption's opening title, authored as [Title]{.smallcaps} */
main.content .smallcaps,
main.content figcaption .smallcaps {
  font-variant-caps: small-caps;
  letter-spacing: 0.03em;
}

/* bibliography: surnames in small caps, matching the working-paper template */
main.content #refs .csl-entry { margin-bottom: 0.6rem; }
main.content #refs .smallcaps { letter-spacing: 0.04em; }

/* ————— tables: roman, like the handbook's truth tables ————— */

main.content table {
  font-family: var(--notes-serif, Georgia, serif);
  font-size: 0.95rem;
  margin-inline: auto;
}

/* Preserve a narrow reading viewport when an exact-value table is wider than
   the phone. The table itself remains scrollable; it must not widen the whole
   chapter or push the navigation off canvas. */
@media (max-width: 768px) {
  main.content table {
    display: block;
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
  }
}

/* code stays in the utility face — it is apparatus, not prose */
main.content :is(code, pre, .sourceCode) {
  font-size: 0.88em;
}

/* ————— links: coloured, not underlined, as in a colorlinks PDF ————— */

main.content a {
  text-decoration: none;
}
main.content a:hover {
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ————— glossary and explanatory-footnote terms —————
   A dotted underline signals that the word itself carries supplementary
   material. Glossary terms remain bold, as they are in the printed notes;
   footnoted terms stay roman so the two kinds of apparatus are distinct. */

main.content .glossary-term,
main.content .footnote-term {
  text-decoration-line: underline;
  text-decoration-style: dotted;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  cursor: help;
}
main.content .glossary-term { font-weight: 700; }
main.content .glossary-term:focus-visible,
main.content .footnote-term:focus-visible {
  outline: 2px solid var(--accent, #002fa7);
  outline-offset: 2px;
  border-radius: 2px;
}

.tippy-box[data-theme~="nw-term-popover"] {
  font-family: var(--notes-serif, Georgia, serif);
  font-size: 0.93rem;
  line-height: 1.45;
  text-align: left;
  color: var(--ink, #14161a);
  background: var(--bs-body-bg, #fff);
  border: 1px solid var(--hairline, #d8dadd);
  border-radius: 0.2rem;
  box-shadow: 0 0.4rem 1.2rem rgb(0 0 0 / 14%);
}
.tippy-box[data-theme~="nw-term-popover"] .tippy-content { padding: 0.7rem 0.8rem; }
.tippy-box[data-theme~="nw-term-popover"] > .tippy-arrow { color: var(--bs-body-bg, #fff); }
.tippy-box[data-theme~="nw-term-popover"] .nw-popover-label {
  display: block;
  margin-bottom: 0.25rem;
  font-weight: 700;
}
.tippy-box[data-theme~="nw-term-popover"] .nw-popover-body > :last-child {
  margin-bottom: 0;
}

main.content .session-glossary dl { margin-top: 1rem; }
main.content .session-glossary dt {
  float: none;
  margin-top: 0.72rem;
  font-weight: 700;
}
main.content .session-glossary dd {
  margin-left: var(--notes-indent);
  margin-bottom: 0.5rem;
}
main.content .session-glossary dd > p { margin: 0; }

/* wide display math scrolls inside its own box, never under the sidebar */
main.content .katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.2rem 0;
}

/* ————— block apparatus —————
   Lemmas, assumption lists and the algorithm are set the way the handbook sets
   any displayed body: indented 1.6em, plain roman, no rules, no small caps, no
   tinted panels. They are apparatus, not theorem environments. */

main.content .theorem,
main.content .assumptions,
main.content .callout.callout-titled {
  margin: 1.3rem 0;
  padding: 0 0 0 var(--notes-indent);
  border: none;
  border-radius: 0;
  background: none;
  font-size: 1em;
}

main.content .theorem .theorem-title,
main.content .assumptions > p:first-child strong:first-child,
main.content .callout.callout-titled .callout-title-container {
  font-variant-caps: normal;
  font-style: normal;
  font-weight: 700;
  letter-spacing: 0;
  background: none;
  padding: 0;
  margin: 0;
  font-size: 1em;
}

main.content .callout.callout-titled :is(.callout-body,
  .callout-body-container, .callout-header) {
  padding: 0;
  background: none;
  border: none;
}
main.content .callout .callout-icon-container { display: none; }

/* Quarto sets callout bodies a size down and in a muted grey; inside the
   reading column they are ordinary prose and must match it. */
main.content .callout.callout-titled :is(.callout-header,
  .callout-title-container, .callout-body, .callout-body-container,
  p, li, ol, ul) {
  color: var(--ink, #14161a);
  font-size: 1em;
  line-height: inherit;
}
main.content .assumptions p { margin: 0.35rem 0; }

/* the standing web-only note at the head of the notes: quiet, and clearly not
   part of the typeset chapter */
main.content .callout:not(.callout-titled) {
  margin: 0 0 2.1rem;
  padding: 0 0 0.9rem;
  border: none;
  border-bottom: 1px solid var(--hairline, #e7e8eb);
  border-radius: 0;
  background: none;
  font-size: 0.93rem;
  color: var(--graphite, #575b64);
}
main.content .callout:not(.callout-titled) .callout-body,
main.content .callout:not(.callout-titled) .callout-body-container {
  padding: 0;
  background: none;
}
main.content .callout:not(.callout-titled) p { margin-bottom: 0; }

/* ————— exercises: the number hangs in the margin ————— */

main.content .exercise {
  margin: 0.95rem 0;
  padding-left: var(--notes-indent);
  border-left: none;
}
main.content .exercise > p:first-child {
  text-indent: calc(-1 * var(--notes-indent));
}

main.content h3.exercise-title {
  margin-top: 1.55rem;
  margin-bottom: 0.35rem;
  font-size: 1.12rem;
  line-height: 1.3;
}

main.content h3.exercise-title + .exercise {
  margin-top: 0;
}

/* On the web these are Quarto's native collapsible callouts. The main notes
   PDF removes the wrapper in the Lua filter; the companion PDF prints the same
   authored material in full. */
main.content .solution-material {
  margin: 0.35rem 0 1.55rem var(--notes-indent);
}

main.content .solution-material .callout.callout-titled {
  margin: 0.48rem 0;
  padding: 0.3rem 0 0.4rem 0.9rem;
  border-left: 1px solid var(--hairline, #d8dadd);
}

main.content .solution-material .callout.callout-titled .callout-header {
  padding: 0.08rem 0;
  cursor: pointer;
}

main.content .solution-material .callout.callout-titled .callout-body-container {
  padding-top: 0.45rem;
}

main.content .solution-material .exercise-hint {
  border-left-style: dotted;
}

main.content .solution-material .exercise-solution {
  border-left-width: 2px;
}

/* ————— quotations ————— */

main.content blockquote {
  font-style: italic;
  border-left: none;
  padding-left: var(--notes-indent);
  color: inherit;
}