/* === Foldable index lists === */

/*
 * Org footnote presentation.
 *
 * Change only this value to switch the preferred presentation:
 *   sidenote — margin notes on wide screens, cards on narrow screens
 *   card     — floating cards on every screen
 */
:root {
  --org-footnote-style: sidenote;
  --org-footnote-accent: #527d9a;
  --org-footnote-card-background: #fff;
  --org-footnote-card-foreground: #333;

  --site-ink: #1b1f23;
  --site-paper: #fbfaf7;
  --site-rule: #d6dce1;
  --site-accent: #527d9a;
  --site-dim: #7c8a93;
  --site-mono-tint: #eef1f3;
  --site-serif: ui-serif, "Anthropic Serif Text", Georgia, "Iowan Old Style", "Palatino Linotype", serif;
  --site-mono: ui-monospace, "Anthropic Mono Web", "SFMono-Regular", "JetBrains Mono", "Cascadia Code",
    Menlo, Consolas, monospace;
}

html[data-org-footnote-style="sidenote"] #content {
  position: relative;
  margin-bottom: var(--org-sidenote-overflow, 0);
}

.org-sidenote-layer {
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

html[data-org-footnote-style="card"] .org-sidenote-layer {
  display: none;
}

.org-sidenote {
  position: absolute;
  left: calc(100% + 1.35rem);
  box-sizing: border-box;
  width: clamp(10rem, calc((100vw - 900px) / 2 - 2rem), 14rem);
  padding-left: 0.75rem;
  color: #59636e;
  border-left: 2px solid #d6dce1;
  font-size: 0.78rem;
  line-height: 1.38;
  pointer-events: auto;
}

.org-sidenote-number {
  margin-right: 0.35em;
  color: var(--org-footnote-accent);
  font-size: 0.85em;
  font-weight: 700;
  vertical-align: super;
}

.org-sidenote .footpara,
.org-sidenote p {
  display: inline;
  margin: 0;
}

.org-footnote-card {
  position: fixed;
  z-index: 1200;
  top: 0;
  left: 0;
  box-sizing: border-box;
  width: min(21rem, calc(100vw - 1.5rem));
  max-height: calc(100vh - 1.5rem);
  padding: 0.8rem 0.95rem;
  overflow: auto;

  color: var(--org-footnote-card-foreground);
  background: var(--org-footnote-card-background);
  border: 1px solid #d7dce1;
  border-radius: 0.65rem;
  box-shadow: 0 0.65rem 1.8rem rgba(31, 41, 55, 0.18);

  font-size: 0.84rem;
  line-height: 1.45;

  opacity: 0;
  visibility: hidden;
  transform: translateY(0.35rem);
  pointer-events: none;
  transition:
    opacity 150ms ease,
    transform 150ms ease,
    visibility 0s linear 150ms;
}

.org-footnote-card[data-placement="above"] {
  transform: translateY(-0.35rem);
}

.org-footnote-card.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
  transition:
    opacity 150ms ease,
    transform 150ms ease,
    visibility 0s linear;
}

.org-footnote-card .org-footnote-card-number {
  margin-right: 0.4em;
  color: var(--org-footnote-accent);
  font-weight: 700;
}

.org-footnote-card .footpara,
.org-footnote-card p {
  display: inline;
  margin: 0;
}

.footref[aria-expanded="true"] {
  color: #035;
  outline: 2px solid color-mix(in srgb, var(--org-footnote-accent) 35%, white);
  outline-offset: 2px;
  border-radius: 0.15rem;
}

html.org-footnotes-enhanced #footnotes {
  display: none;
}

@media (max-width: 1279px) {
  .org-sidenote-layer {
    display: none;
  }
}

@media print {
  .org-sidenote-layer,
  .org-footnote-card {
    display: none !important;
  }

  html.org-footnotes-enhanced #footnotes {
    display: block;
  }
}

@media (prefers-reduced-motion: reduce) {
  .org-footnote-card {
    transition: none;
  }
}

/* Foldable items: replace bullet with triangle, pointer cursor */
.org-ul li.has-subtree {
  cursor: pointer;
  list-style-type: none;
}

/* Triangle indicator */
.org-ul li.has-subtree::before {
  content: "▸";
  display: inline-block;
  margin-right: 0.4em;
  font-size: 0.8em;
  line-height: 1;
  transition: transform 0.25s ease;
  vertical-align: middle;
}

/* Rotate triangle when expanded */
.org-ul li.has-subtree.expanded::before {
  transform: rotate(90deg);
}

/* Collapsed: hide child lists with transition */
.org-ul li.has-subtree > ul {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.35s ease, opacity 0.25s ease;
}

/* Expanded: reveal child lists */
.org-ul li.has-subtree.expanded > ul {
  max-height: 20000px;
  opacity: 1;
}

/* === Site-wide look (paper background, serif headings, slim nav) ===
 * Applies to every page — articles, the academic homepage, and this blog's
 * own homepage — using the tokens defined in :root above.
 */

body {
  background: var(--site-paper);
  color: var(--site-ink);
}

#preamble {
  position: sticky;
  top: 0;
  z-index: 500;
  border-bottom: 1px solid var(--site-rule);
  background: var(--site-paper);
}

#preamble .site-nav {
  max-width: 52rem;
  margin: 0 auto;
  padding: 0.9rem 1.5rem;
  font-family: var(--site-serif);
  font-size: 0.88rem;
  color: var(--site-dim);
}

#preamble .site-nav a {
  color: var(--site-ink);
}

#preamble .site-nav a:hover {
  color: var(--site-accent);
  border-bottom: 1px dotted var(--site-accent);
}

#preamble .site-subnav {
  display: flex;
  gap: 1.5rem;
  max-width: 52rem;
  margin: 0 auto;
  padding: 0 1.5rem 0.75rem;
}

#preamble .site-tab {
  appearance: none;
  margin: 0;
  border: none;
  border-bottom: 2px solid transparent;
  background: none;
  padding: 0.15rem 0;
  font-family: var(--site-serif);
  font-size: 0.95rem;
  color: var(--site-dim);
  cursor: pointer;
}

#preamble .site-tab:hover {
  color: var(--site-ink);
}

#preamble .site-tab.is-active {
  color: var(--site-accent);
  border-bottom-color: var(--site-accent);
}

#postamble {
  max-width: 52rem;
  margin: 0 auto;
  padding: 0 1.5rem 2rem;
}

#postamble .date {
  color: var(--site-dim);
  font-family: var(--site-mono);
  font-size: 0.78rem;
}

#content {
  max-width: 52rem;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

#content h1,
#content h2,
#content h3,
#content h4,
#content h5,
#content h6 {
  font-family: var(--site-serif);
}

/* Clear the slim nav bar above — it now spans the full page width. */
#table-of-contents {
  top: 4rem;
  max-height: calc(100vh - 5rem);

  background: var(--site-paper);
  border: none;
  box-shadow: 0 1px 2px rgba(27, 31, 35, 0.05), 0 6px 20px rgba(27, 31, 35, 0.08);
}

#table-of-contents > h2 {
  font-family: var(--site-serif);
  color: var(--site-ink);
}

#table-of-contents > h2::before {
  color: var(--site-accent);
}

#text-table-of-contents a {
  font-family: var(--site-serif);
  color: var(--site-dim);
}

#text-table-of-contents a:hover {
  background: var(--site-mono-tint);
  color: var(--site-accent);
}

/* === Blog homepage (body.site-home) ===
 * A tighter, left-aligned index layout on top of the shared look above —
 * scoped so it never touches the ordinary bullet lists or wider reading
 * measure used by article pages, which load this same stylesheet.
 */

body.site-home #postamble {
  display: none;
}

body.site-home #preamble .site-nav,
body.site-home #preamble .site-subnav,
body.site-home #content {
  max-width: 46rem;
}

body.site-home #content > h1.title {
  text-align: left;
  font-family: var(--site-serif);
  font-size: 2.5rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 0.5rem;
}

body.site-home .site-tagline {
  max-width: 34rem;
  margin: 0 0 1.75rem;
  color: var(--site-dim);
  font-size: 1.05rem;
  line-height: 1.55;
}

body.site-home #site-search {
  display: block;
  box-sizing: border-box;
  width: 100%;
  margin: 0 0 2.5rem;
  padding: 0.65rem 0.9rem 0.65rem 1.9rem;
  border: 1px solid var(--site-rule);
  border-radius: 0.4rem;
  background:
    #fff
    url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20"><path fill="none" stroke="%237c8a93" stroke-width="1.6" d="M13 13l4 4M4 9a5 5 0 1 1 10 0 5 5 0 0 1-10 0z"/></svg>')
    no-repeat 0.7rem center;
  background-size: 0.95rem;
  font-family: var(--site-mono);
  font-size: 0.88rem;
  color: var(--site-ink);
}

body.site-home #site-search::placeholder {
  color: var(--site-dim);
}

body.site-home #site-search:focus {
  outline: none;
  border-color: var(--site-accent);
  box-shadow: 0 0 0 3px rgba(82, 125, 154, 0.18);
}

body.site-home h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 0.9rem;
}

body.site-home .site-recent {
  margin: 0 0 2.75rem;
}

body.site-home .site-recent > ul.org-ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

body.site-home .site-recent li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  column-gap: 0.65em;
  padding: 0.6rem 0;
  border-bottom: 1px dashed var(--site-rule);
}

body.site-home .site-recent li:last-child {
  border-bottom: none;
}

/* Undo the `display: flex' above for batches not yet revealed by scroll. */
body.site-home .site-recent li[hidden] {
  display: none;
}

body.site-home .site-recent-sentinel {
  height: 1px;
}

body.site-home .site-recent li i {
  order: -1;
  font-style: normal;
  font-family: var(--site-mono);
  font-size: 0.76rem;
  color: var(--site-dim);
  min-width: 5.4rem;
}

body.site-home .site-recent li b {
  font-family: var(--site-serif);
  font-weight: 600;
}

body.site-home .site-recent li a {
  color: var(--site-ink);
}

body.site-home .site-recent li a:hover {
  color: var(--site-accent);
}

body.site-home .site-recent li .site-desc {
  flex-basis: 100%;
  margin-top: 0.15rem;
  color: var(--site-dim);
  font-size: 0.85rem;
  line-height: 1.5;
}

/* The signature piece: the category tree drawn as a real directory listing. */

body.site-home .site-index > ul.org-ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

body.site-home .site-index > ul.org-ul > li {
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--site-rule);
  font-family: var(--site-serif);
  font-size: 1.05rem;
  font-weight: 600;
}

body.site-home .site-index > ul.org-ul > li:last-child {
  border-bottom: none;
}

body.site-home .site-index li.has-subtree::before {
  content: "›";
  font-family: var(--site-mono);
  color: var(--site-accent);
}

body.site-home .site-index li.has-subtree.expanded::before {
  transform: rotate(90deg);
}

/* A fixed identity independent of depth — otherwise this silently inherits
   whatever size/weight the surrounding row happens to have, which made
   nested subfolders look thinner than sibling post titles (posts stay
   bold via <b> regardless of depth) and smaller than top-level folders. */
body.site-home .site-index .folder-name {
  display: inline-block;
  padding: 0.15em 0.6em;
  border-radius: 0.35rem;
  background: rgba(82, 125, 154, 0.1);
  color: var(--site-accent);
  font-size: 0.95rem;
  font-weight: 600;
}

body.site-home .site-index ul.org-ul ul.org-ul {
  margin: 0.6rem 0 0.2rem;
  padding-left: 1.1rem;
  border-left: 1px solid var(--site-rule);
  list-style: none;
  font-family: var(--site-serif);
  font-size: 0.92rem;
  font-weight: 400;
}

body.site-home .site-index ul.org-ul ul.org-ul li {
  padding: 0.45rem 0 0.45rem 0.4rem;
  border-bottom: 1px dashed var(--site-rule);
}

body.site-home .site-index ul.org-ul ul.org-ul li:last-child {
  border-bottom: none;
}

/* Folders (at any depth) get a solid divider instead of a post's dashed
   one, so a folder row reads as a section break rather than another card.
   Spelled out as the full shorthand (not just -style) so it isn't left
   picking up the :last-child rule's reset width/color at equal specificity. */
body.site-home .site-index ul.org-ul ul.org-ul li.has-subtree {
  border-bottom: 1px solid var(--site-rule);
}

body.site-home .site-index ul.org-ul ul.org-ul li.has-subtree:last-child {
  border-bottom: none;
}

body.site-home .site-index ul.org-ul ul.org-ul a {
  color: var(--site-ink);
}

body.site-home .site-index ul.org-ul ul.org-ul a:hover {
  color: var(--site-accent);
}

body.site-home .site-index li i {
  font-style: normal;
  font-weight: 400;
  font-family: var(--site-mono);
  font-size: 0.76rem;
  color: var(--site-dim);
  margin-left: 0.5em;
}

body.site-home .site-index .site-desc {
  display: block;
  margin-top: 0.2rem;
  color: var(--site-dim);
  font-weight: 400;
  font-size: 0.82rem;
  line-height: 1.5;
}

body.site-home .count-chip {
  display: inline-block;
  margin-left: 0.5em;
  padding: 0.05em 0.5em;
  border-radius: 999px;
  background: var(--site-mono-tint);
  color: var(--site-dim);
  font-family: var(--site-mono);
  font-size: 0.72rem;
  font-weight: 400;
  vertical-align: middle;
}

body.site-home .site-index li.filtered-out {
  display: none;
}

@media (max-width: 640px) {
  body.site-home #content {
    padding: 2rem 1.1rem 3.5rem;
  }

  body.site-home #content > h1.title {
    font-size: 2rem;
  }
}