/* ── Reset & Base ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --sidebar-w:   270px;
  --bg:          #fafaf8;
  --bg-sidebar:  #f2f0eb;
  --border:      #ddd9d0;
  --text:        #1a1a18;
  --text-muted:  #6b6760;
  --text-light:  #9c9890;
  --accent:      #5a3e28;
  --accent-hover:#3e2a18;
  --link:        #2c5282;
  --link-hover:  #1a365d;
  --active-bg:   #e8e2d8;
  --sidebar-hover: #e8e2d8;
  --font-body:   Georgia, 'Times New Roman', Times, serif;
  --font-ui:     system-ui, -apple-system, sans-serif;
  --font-mono:   'Courier New', Courier, monospace;
}

html { font-size: 16px; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

/* ── Layout ────────────────────────────────────────────────────── */
.layout {
  display: flex;
  min-height: 100vh;
}

/* ── Sidebar ───────────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.sidebar-header {
  padding: 1.5rem 1.25rem 1rem;
  border-bottom: 1px solid var(--border);
}

.sidebar-header h1 {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: bold;
  line-height: 1.35;
  color: var(--accent);
}

.sidebar-header .subtitle {
  font-size: 0.85rem;
  font-weight: normal;
  font-style: italic;
  color: var(--text-muted);
}

/* ── Journal nav ───────────────────────────────────────────────── */
.journal-nav {
  flex: 1;
  padding: 0.5rem 0 0.5rem;
  overflow-y: auto;
}

/* Section headers within the nav */
.nav-section-head {
  padding: 0.9rem 1.25rem 0.2rem;
  font-family: var(--font-ui);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-light);
  border-top: 1px solid var(--border);
  margin-top: 0.35rem;
}

.nav-section-head:first-child {
  border-top: none;
  margin-top: 0;
}

.unavailable-head {
  color: #bbb5ac;
}

/* Journal links */
.journal-link {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0.35rem 1.25rem;
  font-family: var(--font-ui);
  font-size: 0.775rem;
  color: var(--text);
  text-decoration: none;
  line-height: 1.4;
  border-left: 3px solid transparent;
  transition: background 0.1s;
}

.journal-link:hover {
  background: var(--active-bg);
  color: var(--text);
  text-decoration: none;
}

.journal-link.active {
  background: var(--active-bg);
  border-left-color: var(--accent);
  font-weight: 600;
  color: var(--accent);
}

.journal-link.unavailable {
  cursor: default;
  opacity: 0.45;
}

.journal-link.unavailable:hover {
  background: none;
}

.jname {
  flex: 1;
  min-width: 0;
}

.jmeta {
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
  flex-shrink: 0;
}

.jcount {
  font-size: 0.7rem;
  color: var(--text-light);
  white-space: nowrap;
}

/* ── Source badges ─────────────────────────────────────────────── */
/* Used in both sidebar and article list */
.src-badge {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.1em 0.35em;
  border-radius: 2px;
  vertical-align: middle;
  white-space: nowrap;
  line-height: 1.5;
}

.src-badge.rss {
  background: #e8f0e0;
  color: #3a6b1a;
  border: 1px solid #b8d8a0;
}

.src-badge.scrape {
  background: #f0ece0;
  color: #7a6020;
  border: 1px solid #d8c890;
}

/* ── Sidebar footer ────────────────────────────────────────────── */
.sidebar-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border);
}

.fetch-btn {
  width: 100%;
  padding: 0.45rem 0.75rem;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  background: var(--accent);
  color: #fff;
  border: none;
  cursor: pointer;
  border-radius: 3px;
  transition: background 0.15s;
}

.fetch-btn:hover:not(:disabled) { background: var(--accent-hover); }
.fetch-btn:disabled { opacity: 0.6; cursor: default; }

.fetch-note {
  margin-top: 0.4rem;
  font-family: var(--font-ui);
  font-size: 0.68rem;
  color: var(--text-light);
}

/* ── Main content ──────────────────────────────────────────────── */
.content {
  flex: 1;
  max-width: 820px;
  padding: 2rem 2.5rem;
}

.content-header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 1.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--border);
}

.content-header h2 {
  font-family: var(--font-body);
  font-size: 1.2rem;
  font-weight: bold;
  color: var(--accent);
}

.result-count {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--text-light);
}

/* ── Search & filter bar ───────────────────────────────────────── */
.filter-section {
  margin-bottom: 1.75rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.filter-form {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

/* Search row */
.search-row {
  display: flex;
  gap: 0.5rem;
}

.search-input {
  flex: 1;
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: #fff;
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
}

.search-input:focus {
  border-color: var(--accent);
}

.search-input::placeholder {
  color: var(--text-light);
  font-style: italic;
}

.search-btn {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.45rem 0.9rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 3px;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s;
}

.search-btn:hover { background: var(--accent-hover); }

/* Filter row (year + tag) */
.filter-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.filter-label {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.filter-label-spaced {
  margin-left: 0.5rem;
}

.filter-dash {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--text-light);
}

.filter-select {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  padding: 0.3rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: #fff;
  color: var(--text);
  cursor: pointer;
  outline: none;
}

.filter-select:focus { border-color: var(--accent); }

.filter-select-tag {
  max-width: 200px;
}

.filter-apply-btn {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  padding: 0.3rem 0.65rem;
  background: var(--bg-sidebar);
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
  margin-left: 0.25rem;
  transition: background 0.12s;
}

.filter-apply-btn:hover { background: var(--active-bg); }

.filter-clear {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  color: var(--text-light);
  text-decoration: underline;
  text-underline-offset: 2px;
  margin-left: 0.25rem;
  white-space: nowrap;
}

.filter-clear:hover { color: var(--text-muted); }

/* Active filter pills */
.active-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.65rem;
}

.filter-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-ui);
  font-size: 0.72rem;
  background: #e8e2d5;
  border: 1px solid #ccc7bb;
  border-radius: 2px;
  padding: 0.2em 0.45em;
  color: var(--text-muted);
}

.pill-label {
  font-style: italic;
}

.pill-remove {
  color: var(--text-light);
  font-size: 0.8rem;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
}

.pill-remove:hover {
  color: var(--text);
  text-decoration: none;
}

/* ── Article tags (auto-tagged topics) ─────────────────────────── */
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-top: 0.4rem;
}

.article-tag {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 0.65rem;
  color: var(--text-muted);
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 0.1em 0.4em;
  text-decoration: none;
  transition: background 0.1s, border-color 0.1s;
}

.article-tag:hover {
  background: var(--active-bg);
  border-color: #bbb5ac;
  color: var(--text);
  text-decoration: none;
}

/* ── CrossRef subject keywords ─────────────────────────────────── */
.article-keywords {
  margin-top: 0.3rem;
  font-family: var(--font-ui);
  font-size: 0.68rem;
  color: var(--text-light);
}

.keywords-label {
  font-style: italic;
}

/* ── Period sections ───────────────────────────────────────────── */
.period-section {
  margin-bottom: 2.25rem;
}

.period-heading {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-light);
  margin-bottom: 0.85rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

/* ── Article list ──────────────────────────────────────────────── */
.article-list {
  list-style: none;
  padding: 0;
}

.article {
  margin-bottom: 1.6rem;
  padding-bottom: 1.6rem;
  border-bottom: 1px solid var(--border);
}

.article:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.article-meta-top {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.3rem;
}

.article-journal {
  font-family: var(--font-ui);
  font-size: 0.7rem;
  font-style: italic;
  color: var(--text-muted);
}

.article-date {
  font-family: var(--font-ui);
  font-size: 0.7rem;
  color: var(--text-light);
}

.article-date::before {
  content: "·";
  margin-right: 0.4rem;
}

/* When journal is shown, suppress the leading dot on date */
.article-meta-top .article-journal + .article-date::before,
.article-meta-top:not(:has(.article-journal)) .article-date::before {
  content: none;
}

.article-title {
  display: block;
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: bold;
  line-height: 1.4;
  color: var(--link);
  margin-bottom: 0.3rem;
}

.article-title:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

.article-authors {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

.article-authors.no-data {
  font-style: italic;
  color: var(--text-light);
  font-size: 0.75rem;
}

/* ── Abstract toggle ───────────────────────────────────────────── */
.abstract-toggle {
  margin-top: 0.4rem;
  margin-bottom: 0.3rem;
}

.abstract-toggle summary {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--text-light);
  cursor: pointer;
  user-select: none;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.abstract-toggle summary::before {
  content: "▶";
  font-size: 0.58rem;
  transition: transform 0.15s;
}

.abstract-toggle[open] summary::before {
  transform: rotate(90deg);
}

.abstract-toggle summary::-webkit-details-marker { display: none; }

.abstract-text {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--text-muted);
  max-width: 68ch;
  padding-left: 0.75rem;
  border-left: 2px solid var(--border);
}

/* ── DOI ───────────────────────────────────────────────────────── */
.article-doi {
  margin-top: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-light);
}

.article-doi a { color: var(--text-light); }
.article-doi a:hover { color: var(--link); }

/* ── Pagination ────────────────────────────────────────────────── */
.pagination {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  font-family: var(--font-ui);
  font-size: 0.85rem;
}

.page-link  { color: var(--link); }
.page-info  { color: var(--text-muted); }

/* ── Empty state ───────────────────────────────────────────────── */
.empty-state {
  margin-top: 3rem;
  font-family: var(--font-ui);
  color: var(--text-muted);
  line-height: 2.2;
}

.empty-hint {
  font-size: 0.85rem;
  color: var(--text-light);
}

/* ── Fetch status toast ────────────────────────────────────────── */
.fetch-status {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: #1a1a18;
  color: #f0ede8;
  font-family: var(--font-ui);
  font-size: 0.82rem;
  padding: 0.75rem 1.1rem;
  border-radius: 4px;
  max-width: 380px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
  z-index: 100;
  line-height: 1.5;
}

/* ── Feature nav (What's New / Explore / Authors) ──────────────── */
.feature-nav {
  padding: 0.5rem 0 0.25rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0.25rem;
}

.feature-nav-link {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 1.25rem;
  font-family: var(--font-ui);
  font-size: 0.775rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: background 0.1s;
}

.feature-nav-link:hover {
  background: var(--active-bg);
  color: var(--text);
  text-decoration: none;
}

.active-feature-link {
  background: var(--active-bg);
  border-left-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.feature-nav-icon {
  font-size: 0.65rem;
  color: var(--text-light);
  flex-shrink: 0;
}

.new-badge {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 0.62rem;
  font-weight: 700;
  background: var(--accent);
  color: #fff;
  border-radius: 10px;
  padding: 0.1em 0.45em;
  margin-left: auto;
  line-height: 1.4;
}

/* ── OA badge ──────────────────────────────────────────────────── */
.oa-badge {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 0.1em 0.4em;
  border-radius: 2px;
  background: #d4edda;
  color: #1a5c30;
  border: 1px solid #a3d4b5;
  text-decoration: none;
  white-space: nowrap;
  vertical-align: middle;
}

.oa-badge:hover {
  background: #b8dfc9;
  color: #1a5c30;
  text-decoration: none;
}

/* ── Citation count ────────────────────────────────────────────── */
.cite-count {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  color: var(--text-light);
  margin-left: 0.35rem;
}

/* ── Article title row (title + detail link) ───────────────────── */
.article-title-row {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  margin-bottom: 0.3rem;
}

.article-title-row .article-title {
  margin-bottom: 0;
}

.article-detail-link {
  font-family: var(--font-ui);
  font-size: 0.9rem;
  color: var(--text-light);
  text-decoration: none;
  flex-shrink: 0;
  padding: 0.1em 0.2em;
  transition: color 0.1s;
}

.article-detail-link:hover {
  color: var(--link);
  text-decoration: none;
}

/* ── Export buttons ────────────────────────────────────────────── */
.export-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.1rem;
}

.export-btn {
  font-family: var(--font-ui);
  font-size: 0.7rem;
  padding: 0.25rem 0.6rem;
  background: var(--bg);
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
  transition: background 0.1s, border-color 0.1s;
}

.export-btn:hover {
  background: var(--active-bg);
  border-color: #bbb5ac;
}

/* ── Article detail page ───────────────────────────────────────── */
.detail-page {
  max-width: 780px;
}

.detail-header {
  margin-bottom: 2rem;
  padding-bottom: 1.25rem;
  border-bottom: 2px solid var(--border);
}

.detail-title {
  font-family: var(--font-body);
  font-size: 1.35rem;
  font-weight: bold;
  line-height: 1.4;
  color: var(--link);
  margin: 0.5rem 0 0.6rem;
}

.detail-title a {
  color: var(--link);
}

.detail-title a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

.detail-authors {
  font-family: var(--font-ui);
  font-size: 0.9rem;
  color: var(--text-muted);
}

.author-link {
  color: var(--link);
}

.author-link:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

.detail-meta {
  margin-bottom: 2rem;
}

.detail-abstract {
  margin-bottom: 1.5rem;
}

.detail-section-head {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-light);
  margin-bottom: 0.75rem;
}

.detail-fields {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 0.5rem 1rem;
  font-family: var(--font-ui);
  font-size: 0.83rem;
  margin-top: 1.25rem;
}

.detail-fields dt {
  font-weight: 600;
  color: var(--text-muted);
}

.detail-fields dd {
  color: var(--text);
  margin: 0;
}

.related-section {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
  margin-top: 1.5rem;
}

.related-list {
  list-style: none;
  padding: 0;
}

.related-item {
  margin-bottom: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.related-item:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

/* ── Authors list page ─────────────────────────────────────────── */
.alpha-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-bottom: 1.75rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.alpha-link {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--link);
  padding: 0.15em 0.5em;
  border: 1px solid var(--border);
  border-radius: 2px;
  text-decoration: none;
  transition: background 0.1s;
}

.alpha-link:hover {
  background: var(--active-bg);
  text-decoration: none;
}

.author-letter-section {
  margin-bottom: 2rem;
}

.author-list {
  list-style: none;
  padding: 0;
  columns: 2;
  gap: 0.25rem 2rem;
}

.author-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.2rem 0;
  break-inside: avoid;
}

.author-name-link {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--link);
  text-decoration: none;
}

.author-name-link:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

.author-count {
  font-family: var(--font-ui);
  font-size: 0.7rem;
  color: var(--text-light);
  white-space: nowrap;
  flex-shrink: 0;
}

/* ── Explore page ──────────────────────────────────────────────── */
.explore-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--border);
}

.explore-tab {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.5rem 1.25rem;
  background: none;
  color: var(--text-muted);
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  transition: color 0.1s, border-color 0.1s;
}

.explore-tab:hover {
  color: var(--text);
}

.explore-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 600;
}

.tab-panel {
  min-height: 400px;
}

.chart-toolbar {
  display: flex;
  align-items: center;
  margin-bottom: 0.75rem;
}

.chart-container {
  width: 100%;
  height: 480px;
  position: relative;
}

.heatmap-container {
  width: 100%;
  overflow-x: auto;
  overflow-y: auto;
  max-height: 600px;
}

.network-container {
  width: 100%;
  height: 520px;
  border: 1px solid var(--border);
  border-radius: 3px;
  overflow: hidden;
  background: var(--bg);
}

.explore-hint {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--text-light);
  margin-bottom: 0.75rem;
  font-style: italic;
}

.loading-msg {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  color: var(--text-light);
  padding: 2rem;
  text-align: center;
}

/* D3 tooltip (shared between heatmap + network) */
.heatmap-tooltip {
  position: fixed;
  background: #1a1a18;
  color: #f0ede8;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  padding: 0.45rem 0.75rem;
  border-radius: 3px;
  pointer-events: none;
  z-index: 200;
  line-height: 1.5;
  white-space: nowrap;
}

/* ── What's New page ───────────────────────────────────────────── */
.new-page-header h2 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.journal-new-section + .journal-new-section {
  margin-top: 1.5rem;
}

/* ── Responsive ────────────────────────────────────────────────── */
@media (max-width: 720px) {
  .layout { flex-direction: column; }

  .sidebar {
    width: 100%;
    height: auto;
    position: static;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .journal-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    padding: 0.75rem;
  }

  .nav-section-head {
    width: 100%;
    border-top: none;
    padding: 0.5rem 0.25rem 0.1rem;
  }

  .journal-link {
    padding: 0.3rem 0.6rem;
    border-left: none;
    border-radius: 3px;
    border: 1px solid var(--border);
  }

  .journal-link.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
  }

  .content {
    padding: 1.25rem 1rem;
  }
}

/* ── Journal filter dropdown ─────────────────────────────────────────────── */
.journal-filter-wrapper {
  margin: 0.5rem 0 1rem;
}

.journal-filter {
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
}

.journal-filter-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  list-style: none;
  user-select: none;
}

.journal-filter-summary::-webkit-details-marker { display: none; }

.journal-filter-summary:hover {
  background: var(--sidebar-hover);
}

.filter-summary-text {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.dropdown-arrow {
  margin-left: 0.5rem;
  font-size: 0.75rem;
  color: var(--muted);
}

.journal-filter[open] .dropdown-arrow {
  transform: rotate(180deg);
}

.journal-filter-list {
  max-height: 60vh;
  overflow-y: auto;
  border-top: 1px solid var(--border);
  padding: 0.25rem 0;
}

.journal-filter-divider {
  height: 1px;
  background: var(--border);
  margin: 0.25rem 0;
}

.journal-check-label {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.3rem 0.75rem;
  cursor: pointer;
  font-size: 0.78rem;
  color: var(--text);
  line-height: 1.3;
}

.journal-check-label:hover {
  background: var(--sidebar-hover);
}

.journal-check-label.all-journals-label {
  font-weight: 600;
}

.journal-check-label.unavailable {
  cursor: default;
  opacity: 0.5;
}

.journal-check-label.unavailable:hover {
  background: none;
}

.unavailable-name {
  text-decoration: line-through;
}

.journal-check {
  flex-shrink: 0;
  margin-top: 0.15rem;
  accent-color: var(--accent, #7c6f64);
}

.journal-check-label .jname {
  flex: 1;
}

.journal-check-label .jcount {
  font-size: 0.72rem;
  color: var(--muted);
  flex-shrink: 0;
}

/* ── Citation Context (article detail page) ──────────────────────────────── */
.citation-context {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.citation-columns {
  display: flex;
  gap: 2rem;
  margin-top: 1rem;
}

.citation-col {
  flex: 1;
  min-width: 0;
}

.citation-col-head {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.citation-count {
  font-weight: 400;
  color: var(--text-light);
}

.citation-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.citation-item {
  padding: 0.5rem 0.6rem;
  border-left: 2px solid var(--border);
  font-size: 0.85rem;
}

.citation-byline {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.1rem;
}

.citation-title a {
  color: var(--link);
  font-family: var(--font-body);
  line-height: 1.3;
}

.citation-title a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

.citation-journal {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  color: var(--text-light);
  margin-top: 0.15rem;
}

.citation-overflow {
  margin-top: 0.5rem;
}

.citation-overflow > summary {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: var(--link);
  cursor: pointer;
  padding: 0.25rem 0;
  list-style: none;
}

.citation-overflow > summary::-webkit-details-marker { display: none; }
.citation-overflow > summary:hover { color: var(--link-hover); text-decoration: underline; }

.citation-overflow .citation-list {
  margin-top: 0.5rem;
}

.citation-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.citation-stat {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.citation-pending,
.citation-empty {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--text-light);
  font-style: italic;
  margin-top: 0.5rem;
}

/* Out-of-index citation items */
.citation-item--ext {
  border-left-color: #e8e4dd;
  opacity: 0.82;
}

.citation-title--plain {
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.3;
}

.ext-doi-link {
  font-family: var(--font-ui);
  font-size: 0.7rem;
  color: var(--text-light);
  text-decoration: none;
}

.ext-doi-link:hover {
  color: var(--link);
  text-decoration: none;
}

/* "Also cites N works outside this index" collapsible */
.citation-outside {
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--border);
}

.citation-outside-summary {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: var(--text-muted);
  cursor: pointer;
  list-style: none;
  padding: 0.15rem 0;
  user-select: none;
}

.citation-outside-summary::-webkit-details-marker { display: none; }
.citation-outside-summary:hover { color: var(--text); }

.citation-outside[open] .citation-outside-summary {
  margin-bottom: 0.5rem;
}

.citation-list--ext {
  margin-top: 0.4rem;
}

/* Plain count when outside_refs not available */
.citation-outside-count {
  margin-top: 0.75rem;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: var(--text-light);
  font-style: italic;
}

/* "View in citation network" link in stats bar */
.citation-network-link {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: var(--link);
  text-decoration: none;
  white-space: nowrap;
}

.citation-network-link:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

@media (max-width: 640px) {
  .citation-columns {
    flex-direction: column;
    gap: 1.5rem;
  }
}

/* ── Citations page (per-article ego network) ───────────────────── */
.ego-page {
  max-width: 960px;
}

.ego-header {
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--border);
}

.ego-title {
  font-family: var(--font-body);
  font-size: 1.2rem;
  font-weight: bold;
  line-height: 1.4;
  color: var(--text);
  margin: 0.4rem 0 0.5rem;
}

.ego-authors {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.ego-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.25rem;
  margin-bottom: 0.5rem;
  min-height: 1.5rem;
}

.ego-stats-text {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: var(--text-muted);
  white-space: nowrap;
}

/* Edge colour key */
.ego-key {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.25rem;
  margin-bottom: 0.6rem;
}

.ego-key-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-ui);
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* SVG graph container */
.ego-container {
  width: 100%;
  min-height: 600px;
  background: #fdfcfb;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.ego-container svg {
  display: block;
}

/* Tooltip: inherits .heatmap-tooltip, this tweaks max-width */
.ego-tip {
  max-width: 280px;
  line-height: 1.5;
}

@media (max-width: 700px) {
  .ego-page { padding: 1rem; }
  .ego-key  { flex-direction: column; gap: 0.3rem; }
}

/* ── Explore: Citations tab ─────────────────────────────────────── */
.citations-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.citations-toolbar > .filter-label {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  padding-top: 0.35rem;
  white-space: nowrap;
}

.citations-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1rem;
  align-items: flex-end;
}

.citations-filter-group {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.citations-filter-group .filter-label {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Most-cited ranked list */
.most-cited-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.most-cited-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
}

.most-cited-item:last-child {
  border-bottom: none;
}

.most-cited-rank {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-light);
  min-width: 1.8rem;
  text-align: right;
  padding-top: 0.1rem;
  flex-shrink: 0;
}

.most-cited-body {
  flex: 1;
  min-width: 0;
}

.most-cited-title a {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--link);
  line-height: 1.35;
}

.most-cited-title a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

.most-cited-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.75rem;
  margin-top: 0.3rem;
}

.most-cited-byline {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.most-cited-journal {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--text-light);
}

.most-cited-count {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  background: #f5ede6;
  border-radius: 3px;
  padding: 0.1rem 0.4rem;
}

@media (max-width: 640px) {
  .citations-filters {
    flex-direction: column;
  }
  .citations-toolbar {
    flex-direction: column;
  }
}

/* ── Explore: Citation Network tab ──────────────────────────────── */
.citnet-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.citnet-filters {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 0.6rem 1rem;
}

.citnet-filter-group {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.citnet-filter-group .filter-label {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.citnet-slider {
  width: 120px;
  accent-color: var(--accent);
  cursor: pointer;
  display: block;
}

/* Journal picker dropdown */
.citnet-journal-picker {
  position: relative;
}

.citnet-journal-summary {
  display: block;
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--text);
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--bg);
  cursor: pointer;
  white-space: nowrap;
  user-select: none;
}

.citnet-journal-summary::-webkit-details-marker { display: none; }
.citnet-journal-summary::marker { display: none; }

.citnet-journal-list {
  position: absolute;
  top: calc(100% + 3px);
  left: 0;
  z-index: 200;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.5rem 0.6rem;
  min-width: 230px;
  max-height: 260px;
  overflow-y: auto;
  box-shadow: 0 4px 14px rgba(0,0,0,0.1);
}

.citnet-journal-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: var(--text);
  padding: 0.18rem 0;
  cursor: pointer;
}

.citnet-journal-label:hover { color: var(--accent); }

/* Search box */
.citnet-search-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-top: 1.4rem;
}

.citnet-search-input {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  padding: 0.3rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--bg);
  color: var(--text);
  width: 230px;
}

.citnet-search-input:focus {
  outline: none;
  border-color: var(--accent);
}

.citnet-search-count {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  min-width: 5rem;
}

/* Stats + legend row */
.citnet-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.2rem;
  margin-bottom: 0.5rem;
  min-height: 1.4rem;
}

.citnet-stats-text {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.citnet-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.8rem;
}

.citnet-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-family: var(--font-ui);
  font-size: 0.71rem;
  color: var(--text-muted);
}

.citnet-legend-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* SVG container */
.citnet-container {
  width: 100%;
  min-height: 580px;
  background: #fdfcfb;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.citnet-container svg {
  display: block;
}

/* Tooltip reuses .heatmap-tooltip; this overrides max-width */
.citnet-tip {
  max-width: 260px;
  line-height: 1.45;
}

@media (max-width: 700px) {
  .citnet-controls     { flex-direction: column; }
  .citnet-filters      { flex-direction: column; align-items: stretch; }
  .citnet-search-wrap  { padding-top: 0; }
  .citnet-search-input { width: 100%; }
  .citnet-journal-list { position: static; max-height: 160px; }
}

/* ── Theme toggle button ──────────────────────────────────────── */
.theme-toggle-btn {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  font-family: var(--font-ui);
  font-size: 0.68rem;
  padding: 0.35rem 0.7rem;
  background: var(--bg-sidebar);
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
  z-index: 9999;
  letter-spacing: 0.03em;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.theme-toggle-btn:hover {
  background: var(--active-bg);
  border-color: #bbb5ac;
  color: var(--text);
}

/* ── Dropdown feature nav ──────────────────────────────────────── */
.nav-item {
  position: relative;
}

.nav-item > a.feature-nav-link,
.nav-item-trigger {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 1.25rem;
  font-family: var(--font-ui);
  font-size: 0.775rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: background 0.1s;
  cursor: pointer;
  width: 100%;
  background: none;
  border-top: none;
  border-right: none;
  border-bottom: none;
  user-select: none;
}

.nav-item-trigger:hover,
.nav-item > a.feature-nav-link:hover {
  background: var(--active-bg);
  color: var(--text);
  text-decoration: none;
}

.nav-item.active > .nav-item-trigger,
.nav-item.active > a.feature-nav-link {
  background: var(--active-bg);
  border-left-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.nav-chevron {
  margin-left: auto;
  font-size: 0.6rem;
  color: var(--text-light);
  transition: transform 0.15s;
}

.nav-item.open > .nav-item-trigger .nav-chevron {
  transform: rotate(180deg);
}

.nav-dropdown {
  display: none;
  flex-direction: column;
  background: var(--bg-sidebar);
  border-left: 3px solid var(--border);
  margin-left: 1.25rem;
  margin-bottom: 0.1rem;
}

.nav-item.open > .nav-dropdown {
  display: flex;
}

.nav-dropdown-item {
  display: block;
  padding: 0.28rem 0.9rem;
  font-family: var(--font-ui);
  font-size: 0.73rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: background 0.1s, color 0.1s;
}

.nav-dropdown-item:hover {
  background: var(--active-bg);
  color: var(--text);
  text-decoration: none;
}

.nav-dropdown-item.active {
  color: var(--accent);
  font-weight: 600;
}

.nav-dropdown-divider {
  height: 1px;
  background: var(--border);
  margin: 0.2rem 0.5rem;
}

/* ── Page & tab intros ─────────────────────────────────────────── */
.page-intro {
  font-family: var(--font-body);
  font-size: 0.925rem;
  color: var(--text-muted);
  line-height: 1.68;
  max-width: 680px;
  margin-bottom: 1.5rem;
}

.tab-intro {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.68;
  max-width: 660px;
  margin-bottom: 1.4rem;
  border-left: 3px solid var(--border);
  padding-left: 0.85rem;
}

/* ── Coverage panel ────────────────────────────────────────────── */
.coverage-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--text-muted);
  cursor: pointer;
  border: none;
  background: none;
  padding: 0;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.coverage-toggle:hover { color: var(--text); }

.coverage-panel {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.3s ease;
}

.coverage-panel.open { max-height: 1200px; }

.coverage-table-wrap {
  margin-top: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.coverage-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-ui);
  font-size: 0.78rem;
}

.coverage-table th {
  background: var(--bg-sidebar);
  padding: 0.4rem 0.75rem;
  text-align: left;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

.coverage-table td {
  padding: 0.35rem 0.75rem;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.coverage-table tr:last-child td { border-bottom: none; }

.coverage-pct-bar {
  display: inline-block;
  width: 60px;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  vertical-align: middle;
  margin-right: 0.4rem;
  position: relative;
  overflow: hidden;
}

.coverage-pct-bar-fill {
  position: absolute;
  left: 0; top: 0; bottom: 0;
  background: var(--accent);
  border-radius: 3px;
}

.coverage-note {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

.citation-coverage-note {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 1rem;
  padding: 0.6rem 0.9rem;
  background: var(--bg-sidebar);
  border-left: 3px solid var(--border);
  border-radius: 0 3px 3px 0;
}

/* ── Most-cited page ───────────────────────────────────────────── */
.most-cited-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.2rem;
  align-items: flex-end;
  margin-bottom: 1.4rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.most-cited-control-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.most-cited-control-group label {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.most-cited-control-group select,
.most-cited-control-group input {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  padding: 0.3rem 0.55rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  border-radius: 3px;
}

.most-cited-view-tabs {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
  margin-bottom: 1.4rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0;
}

.most-cited-view-tab {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  padding: 0.4rem 0.9rem;
  border: 1px solid transparent;
  border-bottom: none;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 3px 3px 0 0;
  position: relative;
  bottom: -1px;
  transition: color 0.1s;
}

.most-cited-view-tab:hover { color: var(--text); }

.most-cited-view-tab.active {
  background: var(--bg);
  border-color: var(--border);
  border-bottom-color: var(--bg);
  color: var(--accent);
  font-weight: 600;
}

.most-cited-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.most-cited-item {
  display: flex;
  gap: 0.85rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border);
  align-items: flex-start;
}

.most-cited-rank {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--text-light);
  min-width: 2rem;
  text-align: right;
  padding-top: 0.15rem;
  flex-shrink: 0;
}

.most-cited-body { flex: 1; min-width: 0; }

.most-cited-title {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.4;
  margin-bottom: 0.25rem;
}

.most-cited-title a { color: var(--text); }
.most-cited-title a:hover { color: var(--accent); }

.most-cited-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 0.8rem;
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.most-cited-count {
  font-weight: 600;
  color: var(--accent);
}

.most-cited-group {
  margin-bottom: 2rem;
}

.most-cited-group-head {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  padding: 0.5rem 0 0.4rem;
  border-bottom: 2px solid var(--border);
  margin-bottom: 0;
}

.show-more-wrap {
  text-align: center;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
}

.show-more-btn {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: var(--link);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
}

.show-more-btn:hover { color: var(--link-hover); text-decoration: underline; }

/* ── About page ────────────────────────────────────────────── */
.about-page-wrap {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
}

.about-nav {
  background: var(--bg-sidebar);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  flex-shrink: 0;
}

.about-nav-inner {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 0.65rem 0;
  flex-wrap: wrap;
}

.about-nav-home {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  flex-shrink: 0;
}

.about-nav-home:hover { color: var(--accent-hover); text-decoration: none; }

.about-nav-links {
  display: flex;
  gap: 0.8rem 1.2rem;
  margin-left: auto;
  flex-wrap: wrap;
}

.about-nav-links a {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: var(--text-muted);
  text-decoration: none;
}

.about-nav-links a:hover { color: var(--text); text-decoration: none; }

.about-content {
  flex: 1;
  max-width: 700px;
  margin: 0 auto;
  padding: 3rem 2rem 4rem;
  width: 100%;
}

.about-title {
  font-family: var(--font-body);
  font-size: 1.75rem;
  font-weight: normal;
  color: var(--text);
  margin-bottom: 2.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--border);
}

.about-section {
  margin-bottom: 2.75rem;
}

.about-section h2 {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 1rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--border);
}

.about-body {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.72;
  color: var(--text);
}

.about-body p {
  margin-bottom: 1.1rem;
}

.about-body p:last-child { margin-bottom: 0; }

.citation-block {
  font-family: var(--font-mono);
  font-size: 0.855rem;
  line-height: 1.6;
  background: var(--bg-sidebar);
  border-left: 3px solid var(--border);
  padding: 0.8rem 1.1rem;
  margin: 1.1rem 0;
  color: var(--text);
  border-radius: 0 3px 3px 0;
}

.about-colophon {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.about-colophon h2 {
  font-family: var(--font-ui);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-light);
  margin-bottom: 0.65rem;
  padding-bottom: 0;
  border-bottom: none;
}

.about-colophon p {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--text-light);
  line-height: 1.65;
  margin-bottom: 0;
}

.about-page-footer {
  background: var(--bg-sidebar);
  border-top: 1px solid var(--border);
  padding: 0.75rem 2rem;
  text-align: center;
  font-family: var(--font-ui);
  font-size: 0.72rem;
  color: var(--text-muted);
}

.about-page-footer a {
  color: var(--text-muted);
  text-decoration: none;
  margin: 0 0.4rem;
}

.about-page-footer a:hover { color: var(--text); text-decoration: underline; }

/* Sidebar link to About on every page */
.sidebar-about-link {
  display: block;
  text-align: center;
  font-family: var(--font-ui);
  font-size: 0.71rem;
  color: var(--text-light);
  text-decoration: none;
  margin-top: 0.55rem;
  padding: 0.15rem 0;
}

.sidebar-about-link:hover {
  color: var(--text-muted);
  text-decoration: underline;
}