/* =========================================================
   Ou Liu — PaperMod custom.css (TeX-like academic tone)
   - Single source of truth (deduped)
   - Stable overrides for PaperMod components
   ========================================================= */

/* =========================
   0) Design tokens
   ========================= */
:root{
  --paper-bg: #f7f5ee;
  --paper-bg-2: rgba(0,0,0,0.03);
  --ink: #141210;
  --muted-ink: #3c3a38;

  --panel-bg: rgba(255,255,255,0.65);
  --panel-bg-hover: rgba(255,255,255,0.90);

  --math-bg: #fdfcf8;

  --border: rgba(0,0,0,0.14);
  --border-soft: rgba(0,0,0,0.10);
  --border-hover: rgba(0,0,0,0.18);

  --accent: #1a5fb4; /* links / citations */
}

/* =========================
   1) Page tone & typography
   ========================= */
body{
  background: var(--paper-bg);
  color: var(--ink);
  font-family: "Latin Modern Roman","CMU Serif","STIX Two Text","Times New Roman",serif;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

main, .content{ background: transparent; }

.post-content p,
.post-content li{
  font-size: 1.02rem;
  color: var(--muted-ink);
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4{
  font-family: "Latin Modern Roman","CMU Serif","STIX Two Text",serif;
  font-weight: 600;
  color: var(--ink);
  margin-top: 1.4em;
}

/* Code */
pre, code{
  font-family: "Fira Code","JetBrains Mono","CMU Typewriter Text",monospace;
}
pre{
  background: #f2efe6;
  border: 1px solid #e0dbcf;
}

/* Tables (PaperMod uses --border in theme; we provide our own token too) */
table{
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

/* =========================
   2) MathJax / KaTeX
   ========================= */
.mjx-chtml{
  font-family: "Latin Modern Math","CMU Serif",serif !important;
}

.mjx-chtml.MathJax_Display{
  padding: 0.75em 1em;
  background: var(--math-bg);
  border: 1px solid rgba(0,0,0,0.10);
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.03);
  margin: 1.2em 0;
}

/* =========================
   3) Theorem / math environments
   ========================= */
.math-env,
.thm-block{
  margin: 1.5em 0;
  padding: 0.8em 1.2em;
  border-left: 3px solid rgba(0,0,0,0.22);
  background: rgba(255,255,255,0.55);
  border-radius: 0 6px 6px 0;
  line-height: 1.6;
}

/* Variants */
.math-env.theorem,
.math-env.corollary,
.thm-block.kind-theorem,
.thm-block.kind-corollary{
  border-left-color: rgba(0,0,0,0.55);
  background: rgba(0,0,0,0.03);
}

.math-env.definition,
.math-env.remark,
.thm-block.kind-definition{
  border-left-color: rgba(0,128,128,0.70);
  background: rgba(0,128,128,0.06);
}

.math-env.proposition,
.math-env.lemma,
.thm-block.kind-proposition,
.thm-block.kind-lemma{
  border-left-color: rgba(43,93,138,0.75);
  background: rgba(43,93,138,0.07);
}

.math-env.idea{
  border-left-color: rgba(155,89,182,0.70);
  background: rgba(155,89,182,0.06);
}

/* Proof baseline (container) */
.math-env.proof{
  border-left-color: rgba(0,0,0,0.22);
  background: transparent;
  padding-left: 1em;
}

/* Titles */
.env-title,
.thm-title{
  font-family: serif;
  font-style: italic;
  font-weight: normal;
  color: rgba(0,0,0,0.85);
}

.thm-header{ margin-bottom: 0.5em; }

/* =========================
   4) Collapsible Proof (details/summary) — single frame only
   ========================= */

/* Do not draw outer frame on the <details> itself */
details.math-env.proof{
  border-left: none !important;
  padding-left: 0 !important;
  background: transparent !important;
  margin: 1em 0;
}

/* Summary: kill native marker and use custom arrow */
details.math-env.proof > summary.env-title{
  display: block;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-left: 1.1em;
  margin: 0;
}

details.math-env.proof > summary.env-title::-webkit-details-marker{ display:none; }
details.math-env.proof > summary.env-title::marker{ content:""; }

details.math-env.proof > summary.env-title::before{
  content: "▸";
  position: absolute;
  left: 0;
  top: 0.05em;
  font-size: 0.85em;
  color: rgba(0,0,0,0.45);
  transition: transform 0.15s ease;
}
details.math-env.proof[open] > summary.env-title::before{
  transform: rotate(90deg);
}

/* Content: draw the only vertical bar */
details.math-env.proof > .env-content{
  border-left: 2px solid rgba(0,0,0,0.22);
  padding-left: 1em;
  margin-top: 0.5em;
  background: transparent;
}

/* QED */
details.math-env.proof .qed{
  float: right;
  margin-left: 1em;
  color: rgba(0,0,0,0.65);
}

/* =========================
   5) TikZ-CD / diagrams (SVG)
   ========================= */
.tikzcd-fig{
  display: block;
  width: fit-content;
  max-width: 100%;
  margin: 1.2em auto;
  text-align: center;
}

.tikzcd-fig .tikzcd-img{
  display: block;
  margin: 0 auto;
  max-width: 100%;
  height: auto;
  filter: drop-shadow(0 1px 2px rgba(0,0,0,0.08));
}

.tikzcd-fig figcaption{
  margin-top: 0.4em;
  font-size: 0.95rem;
  color: var(--muted-ink);
}

/* Side-by-side rows */
.cdrow{
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
  flex-wrap: nowrap;
  margin: 1.2em 0;
}

@media (max-width: 900px){
  .cdrow{ flex-wrap: wrap; }
}

.cdrow .tikzcd-fig{
  margin: 0;
  width: auto;
}

.cdrow .cdsep{
  font-size: 1.3em;
  line-height: 1;
  padding: 0 0.25rem;
  white-space: nowrap;
}

/* =========================
   6) Citations / references
   ========================= */

/* Inline citations (your shortcode emits .citation) */
.citation{
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}
.citation:hover{ text-decoration: underline; }

/* Page references */
.page-ref{
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px dotted rgba(0,0,0,0.35);
}
.page-ref:hover{ border-bottom-style: solid; }

/* Pending theorem refs */
.thm-ref-pending{
  opacity: 0.65;
  text-decoration: underline;
}

/* If you have list-style references with these classes */
.reference-entry{
  display: flex;
  gap: 0.6em;
  margin: 0.45em 0;
  line-height: 1.5;
}
.reference-label{
  min-width: 4.5em;
  font-family: "Latin Modern Roman","CMU Serif",serif;
  font-weight: 600;
}
.reference-body{ color: var(--muted-ink); }

/* =========================
   7) Top Prev/Next navigation (PaperMod)
   ========================= */

/* Robust: supports both nav.paginav and nav.post-nav-links */
.post-single nav.paginav,
.post-single nav.post-nav-links{
  display: flex !important;
  align-items: stretch;
  gap: 12px;

  margin: 0 0 1.25rem 0 !important;
  padding: 10px 12px;

  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--paper-bg-2);
}

.post-single nav.paginav a,
.post-single nav.post-nav-links a{
  flex: 1 1 0;
  padding: 10px 12px;

  border-radius: 12px;
  text-decoration: none;

  border: 1px solid var(--border-soft);
  background: var(--panel-bg);

  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease;
}

.post-single nav.paginav a.prev,
.post-single nav.post-nav-links a.prev{ text-align: left; }

.post-single nav.paginav a.next,
.post-single nav.post-nav-links a.next{ text-align: right; }

.post-single nav.paginav a .title,
.post-single nav.post-nav-links a .title{
  display: inline-block;
  font-size: 0.92rem;
  letter-spacing: 0.01em;
  text-transform: none !important;
  color: rgba(0,0,0,0.78);
}

.post-single nav.paginav a:hover,
.post-single nav.post-nav-links a:hover{
  background: var(--panel-bg-hover);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

.post-single nav.paginav a:focus-visible,
.post-single nav.post-nav-links a:focus-visible{
  outline: 2px solid rgba(26,95,180,0.45);
  outline-offset: 2px;
}

@media (max-width: 560px){
  .post-single nav.paginav,
  .post-single nav.post-nav-links{
    flex-direction: column !important;
  }
  .post-single nav.paginav a.next,
  .post-single nav.post-nav-links a.next{
    text-align: left;
  }
}
/* =========================================================
   Top Prev/Next (PaperMod) — compact + centered + label
   ========================================================= */

.post-single nav.paginav {
  /* follow text column, not full page */
  max-width: 640px;
  margin: 0 auto 1.15rem auto !important;

  display: flex !important;
  align-items: stretch;
  gap: 12px;

  padding: 8px 10px;
  border: 1px solid rgba(0,0,0,0.12);
  border-radius: 14px;
  background: rgba(0,0,0,0.02);
}

.post-single nav.paginav a {
  flex: 1 1 0;
  padding: 10px 12px;

  border-radius: 12px;
  text-decoration: none;

  border: 1px solid rgba(0,0,0,0.10);
  background: rgba(255,255,255,0.70);

  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease;
}

.post-single nav.paginav a.prev { text-align: left; }
.post-single nav.paginav a.next { text-align: right; }

.post-single nav.paginav a .title {
  display: inline-block;
  font-size: 0.92rem;
  letter-spacing: 0.01em;
  text-transform: none !important;
  color: rgba(0,0,0,0.78);
}

/* center label */
/* ===== Fix ugly center label on desktop: no wrap, ellipsis, compact ===== */
/* ===== Artistic section label (mathbb-like) ===== */
.post-single nav.paginav .paginav-center{
  /* typography */
  font-family:
    "Latin Modern Math",
    "STIX Two Math",
    "Cambria Math",
    "Times New Roman",
    serif;

  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.18em;

  /* visual tone */
  color: rgba(0, 0, 0, 0.42);      /* 冷灰，不是 UI 灰 */
  text-transform: uppercase;
  white-space: nowrap;

  /* layout discipline */
  flex: 0 1 auto;
  max-width: 10rem;
  overflow: hidden;
  text-overflow: ellipsis;

  /* remove button feel */
  background: none;
  border: none;
  box-shadow: none;

  /* subtle math-style underline */
  padding: 0 0.6rem 0.15rem;
  border-bottom: 1px solid rgba(0,0,0,0.18);

  line-height: 1.1;
  
}


/* IMPORTANT: vertical centering on ALL screen sizes */
.post-single nav.paginav {
  display: flex !important;
  align-items: center !important;
  gap: 12px;
}

/* (optional but recommended) center text inside each button too */
.post-single nav.paginav a {
  display: flex;
  align-items: center;
}

/* hover/focus */
.post-single nav.paginav a:hover {
  background: rgba(255,255,255,0.92);
  border-color: rgba(0,0,0,0.18);
  transform: translateY(-1px);
}

.post-single nav.paginav a:focus-visible {
  outline: 2px solid rgba(26,95,180,0.45);
  outline-offset: 2px;
}

/* mobile: stack; hide center label */
@media (max-width: 560px) {
  .post-single nav.paginav{
    flex-direction: column !important;
    align-items: stretch !important;
    width: 100%;
    max-width: calc(100% - 1.2rem);
  }

  .post-single nav.paginav a{
    width: 100%;
    justify-content: flex-start;
  }

  .post-single nav.paginav a.next,
  .post-single nav.paginav a.prev{
    text-align: left !important;
  }

  /* show the section label on its own line */
  .post-single nav.paginav .paginav-center{
    order: 2;                     /* prev -> label -> next */
    display: block;
    text-align: center;
    padding: 0.35rem 0;
    margin: 0.2rem 0;
    border-top: 1px solid rgba(0,0,0,0.10);
    border-bottom: 1px solid rgba(0,0,0,0.10);
  }

  .post-single nav.paginav a.prev{ order: 1; }
  .post-single nav.paginav a.next{ order: 3; }
}



/* =========================
   N) Wiki section
   ========================= */

.wiki-entry,
.wiki-cat-card,
.wiki-latest-item,
.wiki-side-item,
.wiki-conventions-banner{
  --entry-accent: #1a5fb4;
}

/* --- Inline wiki-links inside content --- */
.wikilink{
  color: var(--entry-accent, var(--accent));
  text-decoration: none;
  border-bottom: 1px dotted color-mix(in srgb, var(--entry-accent, var(--accent)) 55%, transparent);
  transition: border-bottom-style 0.1s ease;
}
.wikilink:hover{ border-bottom-style: solid; }
.wikilink--broken{
  color: rgba(0,0,0,0.45);
  border-bottom: 1px dashed rgba(0,0,0,0.35);
  cursor: help;
}

/* Reset list bullets for every list inside the wiki landing — needed
   because PaperMod's article styles re-introduce list-style on <ul>. */
.ou-section--wiki ul.wiki-latest,
.ou-section--wiki ul.wiki-side-index,
.ou-section--wiki ul.wiki-cat-list{
  list-style: none !important;
  padding-left: 0;
  margin: 0;
}
.ou-section--wiki ul.wiki-latest > li,
.ou-section--wiki ul.wiki-side-index > li{
  list-style: none !important;
  margin-left: 0;
}

/* --- Conventions banner --- */
.wiki-conventions-banner{
  margin: 1.4em 0 1.4em;
  padding: 0.9em 1.2em 1em;
  border-left: 4px solid var(--entry-accent);
  background: rgba(26,95,180,0.05);
  border-radius: 0 8px 8px 0;
}
.wiki-conventions-banner-eyebrow{
  font-family: "Inter","Helvetica Neue",sans-serif;
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--entry-accent);
  margin-bottom: 0.3em;
}
.wiki-conventions-banner-rule{
  margin: 0;
  font-size: 0.98rem;
  color: var(--ink);
  line-height: 1.55;
}
.wiki-conventions-banner-rule strong{ font-weight: 600; }
.wiki-conventions-banner-link{
  margin: 0.55em 0 0;
  font-size: 0.88rem;
}
.wiki-conventions-banner-link a{
  color: var(--entry-accent);
  text-decoration: none;
}
.wiki-conventions-banner-link a:hover{ text-decoration: underline; }

/* --- Search row --- */
.wiki-search-row{
  display: flex;
  align-items: center;
  gap: 0.6em;
  margin: 1em 0 1.6em;
  padding: 0.55em 0.95em;
  border: 1px solid var(--border);
  background: var(--panel-bg);
  border-radius: 999px;
}
.wiki-search-input{
  flex: 1;
  border: none;
  background: transparent;
  font: inherit;
  font-size: 1rem;
  color: var(--ink);
  outline: none;
}
.wiki-search-input::placeholder{ color: rgba(0,0,0,0.40); }
.wiki-search-count{
  font-size: 0.82rem;
  color: var(--muted-ink);
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

/* --- Two-column landing layout --- */
.wiki-landing-grid{
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 2em;
  align-items: start;
  margin-top: 0.5em;
}
@media (max-width: 900px){
  .wiki-landing-grid{ grid-template-columns: 1fr; }
}

.wiki-landing-heading,
.wiki-landing-side-heading{
  font-family: "Latin Modern Roman","CMU Serif",serif;
  font-weight: 600;
  margin-top: 1.6em;
  margin-bottom: 0.6em;
  border-bottom: 1px solid var(--border-soft);
  padding-bottom: 0.3em;
}
.wiki-landing-side-heading{
  margin-top: 0;
  font-size: 1.05rem;
}

/* --- Latest updates (clean, underline-separated, no flex needed) --- */
.wiki-latest-item{
  padding: 0.85em 0.4em 0.95em;
  border-bottom: 1px solid var(--border-soft);
}
.wiki-latest-item:last-child{ border-bottom: none; }

.wiki-latest-link{
  display: inline-block;
  color: var(--entry-accent);
  font-weight: 600;
  font-size: 1.05rem;
  text-decoration: none;
  margin: 0 0 0.18em 0;
  line-height: 1.3;
}
.wiki-latest-link:hover{ text-decoration: underline; }

.wiki-latest-meta{
  font-size: 0.82rem;
  color: var(--muted-ink);
  margin: 0 0 0.35em;
  line-height: 1.4;
}
.wiki-latest-cat{
  color: var(--entry-accent);
  font-style: italic;
}
.wiki-latest-sep{
  margin: 0 0.45em;
  opacity: 0.45;
}
.wiki-latest-date{
  font-variant-numeric: tabular-nums;
}
.wiki-latest-desc{
  margin: 0;
  font-size: 0.92rem;
  color: var(--muted-ink);
  line-height: 1.55;
}

/* --- Topic / category cards --- */
.wiki-cat-grid{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1em;
  margin: 0.6em 0 1em;
}
.wiki-cat-card{
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-top: 4px solid var(--entry-accent);
  border-radius: 8px;
  padding: 0.8em 1em 0.95em;
}
.wiki-cat-title{
  display: flex;
  align-items: center;
  gap: 0.45em;
  margin: 0 0 0.4em 0;
  font-family: "Latin Modern Roman","CMU Serif",serif;
  font-style: italic;
  font-weight: 500;
  font-size: 1.02rem;
  color: var(--ink);
}
.wiki-cat-dot{
  display: inline-block;
  width: 0.55em;
  height: 0.55em;
  border-radius: 50%;
  background: var(--entry-accent);
}
.wiki-cat-list{
  list-style: none !important;
  padding-left: 0;
  margin: 0;
}
.wiki-cat-list li{
  list-style: none !important;
  padding: 0.22em 0;
  border-bottom: 1px dotted var(--border-soft);
  line-height: 1.45;
}
.wiki-cat-list li:last-child{ border-bottom: none; }
.wiki-cat-link{
  color: var(--entry-accent);
  text-decoration: none;
  font-weight: 500;
}
.wiki-cat-link:hover{ text-decoration: underline; }
.wiki-cat-desc{
  display: block;
  font-size: 0.85rem;
  color: var(--muted-ink);
}

/* --- Side index --- */
.wiki-landing-side{
  position: sticky;
  top: 1.2em;
  padding: 0.9em 1em 1em;
  border: 1px solid var(--border);
  background: var(--panel-bg);
  border-radius: 10px;
  max-height: calc(100vh - 2em);
  overflow: auto;
}
.wiki-side-item{
  padding: 0.4em 0.5em;
  border-bottom: 1px dotted var(--border-soft);
}
.wiki-side-item:last-child{ border-bottom: none; }
.wiki-side-item:hover{
  background: rgba(0,0,0,0.03);
}
.wiki-side-link{
  display: flex;
  align-items: center;
  gap: 0.5em;
  color: var(--ink);
  text-decoration: none;
  font-size: 0.95rem;
  line-height: 1.4;
}
.wiki-side-link:hover{ color: var(--entry-accent); }
.wiki-side-dot{
  display: inline-block;
  width: 0.6em;
  height: 0.6em;
  border-radius: 50%;
  background: var(--entry-accent);
  flex-shrink: 0;
}
.wiki-side-alias{
  display: block;
  margin-left: 1.1em;
  font-size: 0.78rem;
  color: var(--muted-ink);
  font-style: italic;
}
.wiki-side-empty{
  margin: 0.6em 0 0;
  color: var(--muted-ink);
  font-style: italic;
  font-size: 0.92rem;
}

/* "Open the graph view →" */
.wiki-graph-link{
  margin-top: 1.5em;
  padding: 0.6em 0.9em;
  background: var(--paper-bg-2);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
}
.wiki-graph-link a{
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

/* =========================
   N.2) Single entry — visible color accent
   ========================= */

.wiki-entry{ position: relative; }

.wiki-entry-band{
  height: 6px;
  margin: -0.6em -0.1em 1em;
  background: var(--entry-accent);
  border-radius: 4px 4px 0 0;
  box-shadow: 0 1px 0 rgba(0,0,0,0.05);
}

.wiki-entry-header{
  margin-bottom: 1.4em;
  padding: 0.4em 0 0.8em 0.9em;
  border-left: 4px solid var(--entry-accent);
  background: rgba(0,0,0,0.02);
  border-radius: 0 6px 6px 0;
}
.wiki-entry-eyebrow{
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  color: var(--entry-accent);
  font-weight: 600;
}
.wiki-entry-dot{
  display: inline-block;
  width: 0.6em;
  height: 0.6em;
  border-radius: 50%;
  background: var(--entry-accent);
}
.wiki-entry-title{
  color: var(--ink);
  margin-top: 0.25em;
}
.wiki-aliases{
  margin: 0.4em 0 0.2em;
  font-size: 0.92rem;
  color: var(--muted-ink);
}
.wiki-aliases em{ color: var(--ink); }

/* Section headings (Introduction, Body, etc.) get a colored left bar */
.wiki-entry .post-content h2,
.wiki-entry .post-content h3{
  position: relative;
  padding-left: 0.55em;
  border-left: 4px solid var(--entry-accent);
}
.wiki-entry .post-content h2{
  color: var(--ink);
  margin-top: 1.6em;
}
.wiki-entry .post-content h3{
  color: var(--entry-accent);
  border-left-width: 3px;
}

/* Neighborhood (graph only) */
.wiki-neighborhood{
  margin: 2.2em 0 0.5em;
  padding: 1em 1.2em 1.2em;
  border: 1px solid var(--border);
  border-top: 4px solid var(--entry-accent);
  border-radius: 8px;
  background: var(--panel-bg);
}
.wiki-neighborhood-heading{
  margin: 0 0 0.7em 0;
  font-family: "Latin Modern Roman","CMU Serif",serif;
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--ink);
}
.wiki-neighborhood-graph{
  position: relative;
  width: 100%;
  height: 280px;
  overflow: hidden;
  border-radius: 6px;
  background: var(--paper-bg);
  border: 1px solid var(--border-soft);
}
.wiki-neighborhood-hint{
  margin: 0.55em 0 0;
  font-size: 0.85rem;
  color: var(--muted-ink);
}
.wiki-neighborhood-hint a{
  color: var(--entry-accent);
  text-decoration: none;
}
.wiki-neighborhood-hint a:hover{ text-decoration: underline; }
.wiki-neighborhood-hint code{
  font-size: 0.85em;
  background: rgba(0,0,0,0.05);
  padding: 0.05em 0.35em;
  border-radius: 3px;
}

/* --- Full graph page --- */
.wiki-graph-page .post-header{ margin-bottom: 1em; }

.wiki-graph-canvas{
  position: relative;
  width: 100%;
  min-height: 480px;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}
.wiki-graph-hint{
  margin: 0.7em 0 0.4em;
  font-size: 0.9rem;
  color: var(--muted-ink);
}
.wiki-graph-legend{
  display: flex;
  flex-wrap: wrap;
  gap: 0.6em 1.1em;
  margin: 0.4em 0 1em;
  font-size: 0.9rem;
  color: var(--muted-ink);
}
.wiki-graph-legend-item{
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
}
.wiki-graph-legend-swatch{
  display: inline-block;
  width: 0.7em;
  height: 0.7em;
  border-radius: 50%;
  border: 1px solid rgba(0,0,0,0.15);
}