/* Paper-style academic homepage
   Typeset to resemble an A&A manuscript: running heads, structured abstract,
   numbered sections, booktabs tables, figure captions and author-year references. */

:root {
  --desk: #e8e6e1;
  --paper: #fffefb;
  --ink: #161616;
  --ink-soft: #4a4a4a;
  --ink-faint: #8a8781;
  --rule: #1c1c1c;
  --rule-soft: #d6d3cc;
  --link: #1f4e96;
  --link-hover: #0d2f63;
  --stamp: #b5b1a9;
  --bar: #1f4e96;
  --shadow: 0 1px 2px rgba(0,0,0,.06), 0 8px 30px rgba(0,0,0,.08);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --desk: #0e0f11;
    --paper: #18191c;
    --ink: #e7e4dd;
    --ink-soft: #b4b0a8;
    --ink-faint: #7d7a74;
    --rule: #d8d4cc;
    --rule-soft: #34353a;
    --link: #8fb4ec;
    --link-hover: #c0d6f7;
    --stamp: #45464b;
    --bar: #8fb4ec;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 30px rgba(0,0,0,.35);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --desk: #0e0f11;
  --paper: #18191c;
  --ink: #e7e4dd;
  --ink-soft: #b4b0a8;
  --ink-faint: #7d7a74;
  --rule: #d8d4cc;
  --rule-soft: #34353a;
  --link: #8fb4ec;
  --link-hover: #c0d6f7;
  --stamp: #45464b;
  --bar: #8fb4ec;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 30px rgba(0,0,0,.35);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--desk);
  color: var(--ink);
  font-family: "STIX Two Text", "Times New Roman", Times, serif;
  font-size: 17px;
  line-height: 1.55;
  font-feature-settings: "kern", "liga", "onum";
  text-rendering: optimizeLegibility;
}

a { color: var(--link); text-decoration: none; }
a:hover { color: var(--link-hover); text-decoration: underline; text-underline-offset: 2px; }
a:focus-visible { outline: 2px solid var(--link); outline-offset: 2px; border-radius: 2px; }

/* ---------- the sheet ---------- */

.sheet {
  position: relative;
  max-width: 820px;
  margin: 40px auto;
  padding: 44px 72px 36px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

/* arXiv-style vertical stamp in the left margin */
.stamp {
  position: absolute;
  left: 22px;
  top: 50%;
  transform: translate(-50%, -50%) rotate(-90deg);
  white-space: nowrap;
  font-family: "STIX Two Text", serif;
  font-size: 26px;
  letter-spacing: .02em;
  color: var(--stamp);
  user-select: none;
  pointer-events: none;
}

/* ---------- running head and navigation ---------- */

.runhead {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-size: 13px;
  font-style: italic;
  color: var(--ink-soft);
  border-bottom: .5px solid var(--rule-soft);
  padding-bottom: 6px;
}

.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  margin: 10px 0 34px;
  font-size: 14px;
  font-variant: small-caps;
  letter-spacing: .03em;
}
.toc a { color: var(--ink-soft); }
.toc a .n { font-variant: normal; color: var(--ink-faint); margin-right: 4px; }
.toc a[aria-current="page"] { color: var(--ink); font-weight: 600; }
.toc a:hover { color: var(--link); text-decoration: none; }
.toc .theme {
  margin-left: auto;
  background: none;
  border: 0;
  padding: 0;
  font: inherit;
  font-variant: small-caps;
  color: var(--ink-faint);
  cursor: pointer;
}
.toc .theme:hover { color: var(--link); }

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

h1.title {
  font-size: 30px;
  line-height: 1.2;
  font-weight: 700;
  margin: 0 0 14px;
  letter-spacing: -.005em;
  text-wrap: balance;
}

.authors { font-size: 17px; margin: 0 0 8px; }
.authors sup, .affil sup { font-size: 11px; }

.affil {
  font-size: 13.5px;
  line-height: 1.45;
  color: var(--ink-soft);
  margin: 0 0 10px;
}
.affil div { margin: 0; }

.dates {
  font-size: 13.5px;
  color: var(--ink-soft);
  margin: 0 0 14px;
}

/* ---------- abstract ---------- */

.abstract {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 10px 0 12px;
  margin: 0 0 30px;
  font-size: 15px;
  line-height: 1.5;
}
.abstract h2 {
  text-align: center;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .14em;
  margin: 0 0 6px;
}
.abstract p { margin: 0 0 4px; text-align: justify; hyphens: auto; }
.abstract .lab { font-style: italic; }
.abstract .kw { border-top: .5px solid var(--rule-soft); padding-top: 8px; margin-top: 10px; }

/* ---------- body ---------- */

main h2 {
  font-size: 18px;
  font-weight: 700;
  margin: 30px 0 8px;
}
main h3 {
  font-size: 16.5px;
  font-weight: 400;
  font-style: italic;
  margin: 20px 0 6px;
}
main h2 .n, main h3 .n { margin-right: .55em; }

main p { margin: 0 0 10px; text-align: justify; hyphens: auto; }
main p + p { text-indent: 1.4em; }
main ul, main ol { margin: 0 0 12px; padding-left: 1.4em; }
main li { margin: 0 0 4px; }

.bn { font-family: "Noto Serif Bengali", "STIX Two Text", serif; }

.lede::first-letter {
  float: left;
  font-size: 3.4em;
  line-height: .85;
  padding: 4px 6px 0 0;
  font-weight: 700;
}

/* equations */
.eq {
  display: flex;
  align-items: center;
  margin: 14px 0 16px;
}
.eq .math { flex: 1; text-align: center; font-size: 19px; }
.eq .num { color: var(--ink); }
.math i { font-style: italic; }
.math .op { margin: 0 .25em; }

/* figures */
figure { margin: 22px 0; }
figure img { display: block; width: 100%; height: auto; border: .5px solid var(--rule-soft); }
figcaption {
  font-size: 14px;
  line-height: 1.45;
  margin-top: 8px;
  text-align: justify;
  hyphens: auto;
}
figcaption b { font-weight: 700; }

.float-right {
  float: right;
  width: 210px;
  margin: 4px 0 12px 26px;
}

/* tables, booktabs style */
.table-wrap { overflow-x: auto; margin: 22px 0; }
table { width: 100%; border-collapse: collapse; font-size: 14.5px; line-height: 1.4; }
caption {
  caption-side: top;
  text-align: left;
  font-size: 14px;
  padding-bottom: 6px;
}
thead th {
  text-align: left;
  font-weight: 400;
  border-top: 1px solid var(--rule);
  border-bottom: .5px solid var(--rule);
  padding: 5px 10px 5px 0;
}
tbody td { padding: 4px 10px 4px 0; vertical-align: top; }
tbody tr:last-child td { border-bottom: 1px solid var(--rule); padding-bottom: 6px; }
tfoot td { padding: 5px 10px 0 0; font-size: 13px; color: var(--ink-soft); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums lining-nums; white-space: nowrap; }
td.yr { white-space: nowrap; font-variant-numeric: lining-nums; color: var(--ink-soft); }
tr.total td { border-top: .5px solid var(--rule); padding-top: 5px; }

.bar {
  display: inline-block;
  height: 7px;
  background: var(--bar);
  opacity: .75;
  vertical-align: middle;
}

/* footnotes */
sup.fn a { font-size: 11px; padding: 0 1px; }
.footnotes {
  border-top: .5px solid var(--rule-soft);
  margin-top: 28px;
  padding-top: 6px;
  width: 40%;
  min-width: 220px;
}
.footnotes ol { font-size: 13px; padding-left: 1.1em; margin: 0; color: var(--ink-soft); }
.footnotes li { margin: 0; }

/* references */
.refs { list-style: none; padding: 0; margin: 0; font-size: 14.5px; line-height: 1.45; }
.refs li { padding-left: 1.5em; text-indent: -1.5em; margin: 0 0 7px; }
.refs .me { font-weight: 700; }
.refs .t { font-style: italic; }
.refs .links { font-size: 13px; white-space: nowrap; }
.refs .links a + a::before { content: " · "; color: var(--ink-faint); }

ol.refs.numbered { counter-reset: ref; }
ol.refs.numbered li { counter-increment: ref; padding-left: 2.2em; text-indent: 0; position: relative; }
ol.refs.numbered li::before {
  content: "[" counter(ref) "]";
  position: absolute;
  left: 0;
  color: var(--ink-faint);
  font-variant-numeric: lining-nums;
}

/* a definition-style list, used for contact details and software */
dl.defs { display: grid; grid-template-columns: max-content 1fr; gap: 4px 18px; margin: 0 0 12px; font-size: 15.5px; }
dl.defs dt { font-style: italic; color: var(--ink-soft); }
dl.defs dd { margin: 0; }

.ack { font-size: 15px; }
.ack strong { font-weight: 700; }

.clear { clear: both; }

/* ---------- footer ---------- */

.pagefoot {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 40px;
  padding-top: 6px;
  border-top: .5px solid var(--rule-soft);
  font-size: 12.5px;
  color: var(--ink-faint);
}

.pager { display: flex; justify-content: space-between; gap: 16px; margin-top: 30px; font-size: 14.5px; }
.pager a { color: var(--ink-soft); }
.pager a:hover { color: var(--link); }

/* ---------- small screens ---------- */

@media (max-width: 980px) {
  .stamp { display: none; }
}
@media (max-width: 760px) {
  body { font-size: 16.5px; }
  .sheet { margin: 0; padding: 22px 16px 24px; box-shadow: none; }
  h1.title { font-size: 25px; }
  .runhead span:last-child { display: none; }
  .float-right { float: none; width: 62%; max-width: 240px; margin: 4px auto 16px; }
  main p, .abstract p, figcaption { text-align: left; }
  .footnotes { width: 60%; }
  dl.defs { grid-template-columns: 1fr; gap: 0; }
  dl.defs dd { margin-bottom: 8px; }
  .toc .theme { margin-left: 0; }
}

/* ---------- print as a real preprint ---------- */

@media print {
  body { background: #fff; color: #000; font-size: 10.5pt; }
  .sheet { box-shadow: none; margin: 0; max-width: none; padding: 0; }
  .toc, .pager, .toc .theme { display: none; }
  .stamp { display: block; left: -14mm; color: #999; }
  a { color: #000; }
}

code { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: .86em; }