/* Simple academic blog style */
:root {
  --text: #1a1a1a;
  --muted: #666;
  --link: #1456b8;
  --rule: #e2e2e2;
  --bg: #ffffff;
  --accent: #b5121b;
  --maxw: 760px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 1rem; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Georgia, "Times New Roman", Charter, serif;
  font-size: 18px;
  line-height: 1.65;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- layout ---- */
.layout { display: flex; align-items: flex-start; gap: 2.5rem; max-width: 1180px; margin: 0 auto; padding: 0 1.25rem; }

.toc {
  position: sticky;
  top: 0;
  width: 260px;
  flex: 0 0 260px;
  max-height: 100vh;
  overflow-y: auto;
  padding: 1.6rem 0.5rem 2rem 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 0.82rem;
  line-height: 1.4;
  border-right: 1px solid var(--rule);
}
.toc-head { font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; font-size: 0.72rem; color: var(--muted); margin-bottom: 0.6rem; }
.toc-list { list-style: none; margin: 0; padding: 0; }
.toc-list li { margin: 0.12rem 0; }
.toc-list a { color: #333; display: block; padding: 0.1rem 0.3rem; border-radius: 3px; }
.toc-list a:hover { background: #f2f4f8; text-decoration: none; color: var(--link); }
.toc-l1 { margin-top: 0.45rem !important; }
.toc-l1 > a { font-weight: 600; }
.toc-l2 > a { padding-left: 1.1rem; color: #555; font-size: 0.95em; }

.content { flex: 1 1 auto; min-width: 0; max-width: var(--maxw); margin: 0 auto; padding: 1.5rem 0 4rem; }

/* ---- header ---- */
.site-header { border-bottom: 2px solid var(--text); padding-bottom: 1.1rem; margin-bottom: 2rem; }
.paper-title { font-size: 1.85rem; line-height: 1.25; margin: 0.4rem 0 0.8rem; font-weight: 700; }
.authors { margin: 0.2rem 0; font-size: 1rem; }
.authors sup { color: var(--accent); font-size: 0.7em; }
.affil { margin: 0.2rem 0; color: var(--muted); font-size: 0.82rem; }
.links { margin: 0.9rem 0 0; font-size: 0.95rem; font-family: -apple-system, system-ui, sans-serif; }
.links .sep { color: var(--rule); margin: 0 0.2rem; }

/* ---- citation box ---- */
.cite-box { margin: 2.5rem 0 1rem; border: 1px solid var(--rule); border-radius: 6px; background: #f8f9fb; overflow: hidden; scroll-margin-top: 1rem; }
.cite-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 0.5rem 0.8rem; background: #eef1f6; border-bottom: 1px solid var(--rule); font-family: -apple-system, system-ui, sans-serif; font-size: 0.82rem; font-weight: 600; color: #444; }
.copy-btn { font: inherit; font-size: 0.75rem; font-weight: 600; cursor: pointer; border: 1px solid #c7ccd6; background: #fff; color: #333; padding: 0.2rem 0.6rem; border-radius: 4px; }
.copy-btn:hover { background: var(--link); color: #fff; border-color: var(--link); }
.cite-box pre { margin: 0; padding: 0.8rem; overflow-x: auto; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.76rem; line-height: 1.5; color: #1a1a1a; white-space: pre; }

/* ---- headings ---- */
article h1, article h2, article h3, article h4 {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.25;
  scroll-margin-top: 1rem;
}
article h1 { font-size: 1.5rem; margin: 2.4rem 0 1rem; padding-bottom: 0.3rem; border-bottom: 1px solid var(--rule); font-weight: 700; }
article h2 { font-size: 1.2rem; margin: 2rem 0 0.7rem; font-weight: 650; }
article h3 { font-size: 1.04rem; margin: 1.5rem 0 0.5rem; font-weight: 600; }
article h4 { font-size: 0.95rem; margin: 1.2rem 0 0.3rem; font-weight: 600; color: #333; }
h1.unnumbered { border-bottom: 1px solid var(--rule); }

/* paragraph run-in (\paragraph) becomes h4 + following p */
article p { margin: 0.7rem 0; }
article p { text-align: justify; hyphens: auto; }

/* ---- figures / table-images ---- */
figure { margin: 1.8rem 0; text-align: center; }
figure img { max-width: 100%; height: auto; border: 1px solid var(--rule); border-radius: 4px; background: #fff; }
.imgzoom { display: inline-block; cursor: zoom-in; }
figure .imgzoom::after { content: "↗ click to enlarge"; display: block; font-size: 0.68rem; color: #aaa; font-family: -apple-system, system-ui, sans-serif; margin-top: 0.25rem; }
figcaption {
  font-size: 0.82rem; color: var(--muted); line-height: 1.5;
  margin-top: 0.6rem; text-align: left; padding: 0 0.2rem;
  font-family: -apple-system, system-ui, sans-serif;
}
figcaption a { color: var(--link); }

/* ---- lists ---- */
article ul, article ol { padding-left: 1.4rem; }
article li { margin: 0.3rem 0; }

/* ---- math ---- */
mjx-container[display="true"] { overflow-x: auto; overflow-y: hidden; max-width: 100%; }

/* ---- citations & references ---- */
.citation a { color: var(--link); }
#refs { margin-top: 1.5rem; }
.csl-bib-body { font-size: 0.82rem; line-height: 1.45; }
.csl-entry { margin: 0.4rem 0; }
div.hanging-indent .csl-entry { padding-left: 1.6em; text-indent: -1.6em; }

/* ---- footer ---- */
.site-footer { margin-top: 3rem; padding-top: 1.2rem; border-top: 1px solid var(--rule); color: var(--muted); font-size: 0.8rem; font-family: -apple-system, system-ui, sans-serif; }

/* ---- responsive ---- */
@media (max-width: 900px) {
  body { font-size: 17px; }
  .layout { flex-direction: column; gap: 0; padding: 0 1rem; }
  .toc {
    position: static; width: auto; flex-basis: auto; max-height: none;
    border-right: none; border-bottom: 1px solid var(--rule);
    padding: 1rem 0; margin-top: 0.5rem;
  }
  .toc-list { column-count: 2; column-gap: 1.2rem; }
  .toc-l1 { break-inside: avoid; }
  .content { padding-top: 1rem; }
  article p { text-align: left; }
}
@media (max-width: 520px) {
  .toc-list { column-count: 1; }
  .paper-title { font-size: 1.45rem; }
}