/* ============================================================
   Journal of M. Argoo — Design System
   Inspired by ACM, Nature, and Science journal typography.
   Light-only, print-first, no AI artifacts.
   ============================================================ */

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

html {
  font-size: 19px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: "Crimson Text", Georgia, "Times New Roman", serif;
  font-size: 1rem;
  line-height: 1.7;
  color: #1a1a1a;
  background: #fefdfb;
}

img { max-width: 100%; height: auto; display: block; }

a {
  color: #1a5c8a;
  text-decoration: none;
}
a:hover { text-decoration: underline; color: #14456a; }

/* Global emphasis: Heiti (sans-serif blackbody), not italic */
em, i {
  font-style: normal;
  font-weight: 600;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, -apple-system, sans-serif;
}

/* ---- Horizontal Rules ---- */
hr {
  border: none;
  border-top: 1px solid #d5d0c8;
  margin: 2rem 0;
}

/* ---- Selection ---- */
::selection {
  background: #e8e0d5;
  color: #1a1a1a;
}

/* ============================================================
   Masthead
   ============================================================ */
.site-masthead {
  background: #1a1a2e;
  color: #fff;
  padding: 2.5rem 1.5rem 1.8rem;
  text-align: center;
  border-bottom: 4px solid #8b1a1a;
}

.masthead-journal-name {
  font-family: "Playfair Display", Georgia, "Times New Roman", serif;
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #fff;
  text-decoration: none;
  display: block;
  line-height: 1.15;
}
.masthead-journal-name:hover {
  text-decoration: none;
  color: #fff;
}

.masthead-subtitle {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, -apple-system, sans-serif;
  font-size: 0.95rem;
  color: rgba(255,255,255,0.7);
  margin-top: 0.35rem;
}

.masthead-meta {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: rgba(255,255,255,0.5);
  margin-top: 0.75rem;
}

/* ============================================================
   Navigation
   ============================================================ */
.site-nav {
  border-bottom: 1px solid #000;
  background: #fff;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3rem;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 0;
}

.nav-links a {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #555;
  padding: 0.9rem 1rem;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}
.nav-links a:hover {
  color: #000;
  text-decoration: none;
  border-bottom-color: #000;
}

.nav-search {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #767676;
  cursor: pointer;
  padding: 0.9rem 0;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color 0.15s;
}
.nav-search:hover { color: #000; }

/* ============================================================
   Search Modal
   ============================================================ */
.search-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 200;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding-top: 12vh;
}
.search-overlay.active { display: flex; }

.search-modal {
  width: 100%;
  max-width: 620px;
  background: #fff;
  border: 1px solid #000;
}

.search-input-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid #d5d0c8;
}
.search-input-wrap svg { color: #767676; flex-shrink: 0; }

.search-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.1rem;
  color: #1a1a1a;
}
.search-input::placeholder { color: #aaa; }

.search-close {
  background: none;
  border: none;
  color: #767676;
  cursor: pointer;
  font-size: 1.1rem;
  padding: 4px;
  line-height: 1;
}
.search-close:hover { color: #000; }

.search-results {
  max-height: 55vh;
  overflow-y: auto;
}

.search-empty {
  padding: 2rem 1.25rem;
  text-align: center;
  color: #767676;
  font-size: 0.95rem;
}

.search-result-item {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid #eee;
  cursor: pointer;
  text-decoration: none;
  display: block;
  transition: background 0.1s;
}
.search-result-item:hover {
  background: #faf8f5;
  text-decoration: none;
}
.search-result-item:last-child { border-bottom: none; }

.search-result-title {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1rem;
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 3px;
}
.search-result-title .highlight {
  color: #8b1a1a;
  background: rgba(139,26,26,0.08);
}

.search-result-meta {
  font-size: 0.75rem;
  color: #767676;
  font-family: system-ui, sans-serif;
  margin-bottom: 4px;
}

.search-result-snippet {
  font-size: 0.9rem;
  color: #555;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.search-result-snippet .highlight {
  color: #8b1a1a;
  font-weight: 600;
}

.search-status {
  padding: 0.6rem 1.25rem;
  font-size: 0.7rem;
  color: #767676;
  font-family: system-ui, sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-top: 1px solid #d5d0c8;
}

/* ============================================================
   Page Layout (sidebar + main)
   ============================================================ */
.page-layout {
  max-width: 1140px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 3rem;
}

@media (max-width: 860px) {
  .page-layout {
    grid-template-columns: 1fr;
    padding: 1.5rem 1rem;
    gap: 2rem;
  }
}

/* ============================================================
   Sidebar
   ============================================================ */
.sidebar {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 0.8rem;
  border-right: 1px solid #d5d0c8;
  padding-right: 1.5rem;
}

.sidebar-section-title {
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: #8b1a1a;
  margin-bottom: 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid #000;
}

.sidebar-list {
  list-style: none;
  margin-bottom: 1.8rem;
}

.sidebar-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.25rem 0;
}

.sidebar-list a {
  font-size: 0.8rem;
  color: #555;
  font-weight: 500;
}
.sidebar-list a:hover { color: #000; text-decoration: none; }

.sidebar-count {
  font-size: 0.65rem;
  color: #aaa;
  font-family: "IBM Plex Mono", monospace;
}

.sidebar-footer-link {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: #767676;
  margin-top: 0.5rem;
}
.sidebar-footer-link:hover { color: #000; }

@media (max-width: 860px) {
  .sidebar {
    border-right: none;
    border-bottom: 1px solid #d5d0c8;
    padding-right: 0;
    padding-bottom: 1.5rem;
  }
}

/* ============================================================
   Featured Article
   ============================================================ */
.featured-article {
  margin-bottom: 2.8rem;
  padding-bottom: 2rem;
  border-bottom: 2px solid #000;
}

.featured-label {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: #8b1a1a;
  margin-bottom: 0.6rem;
}

.featured-title {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 0.5rem;
}
.featured-title a { color: #000; }
.featured-title a:hover { color: #1a5c8a; text-decoration: none; }

.featured-authors {
  font-size: 0.95rem;
  color: #555;
  margin-bottom: 0.75rem;
}

.featured-abstract {
  font-size: 1rem;
  line-height: 1.65;
  color: #333;
  margin-bottom: 1rem;
  max-width: 1020px;
}

.featured-keywords {
  font-size: 0.82rem;
  color: #767676;
  margin-bottom: 1rem;
}
.featured-keywords strong {
  font-family: system-ui, sans-serif;
  font-weight: 600;
  color: #555;
  text-transform: uppercase;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
}

/* ============================================================
   Section Header
   ============================================================ */
.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid #000;
}

.section-label {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: #000;
}

.section-more {
  font-family: system-ui, sans-serif;
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #767676;
}
.section-more:hover { color: #000; text-decoration: none; }

/* ============================================================
   Article List (replaces paper cards)
   ============================================================ */
.article-list {
  display: flex;
  flex-direction: column;
}

.article-item {
  padding: 1.4rem 0;
  border-bottom: 1px solid #e8e3da;
}
.article-item:first-child { padding-top: 0; }

.article-item-category {
  font-family: system-ui, sans-serif;
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: #8b1a1a;
  margin-bottom: 0.25rem;
}

.article-item-title {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 0.2rem;
}
.article-item-title a { color: #000; }
.article-item-title a:hover { color: #1a5c8a; text-decoration: none; }

.article-item-authors {
  font-size: 0.88rem;
  color: #555;
  margin-bottom: 0.25rem;
}

.article-item-abstract {
  font-size: 0.9rem;
  line-height: 1.55;
  color: #555;
  margin-bottom: 0.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-item-meta {
  font-family: system-ui, sans-serif;
  font-size: 0.7rem;
  color: #aaa;
  display: flex;
  gap: 1rem;
  align-items: center;
}

.article-item-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag-link {
  font-family: system-ui, sans-serif;
  font-size: 0.62rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #767676;
  padding: 0.15rem 0;
}
.tag-link:hover { color: #000; text-decoration: none; }
.tag-link::after { content: " ·"; color: #ccc; }
.tag-link:last-child::after { content: ""; }

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.55rem 1.1rem;
  border: 1px solid #000;
  cursor: pointer;
  text-decoration: none;
  background: #fff;
  color: #000;
  transition: background 0.15s, color 0.15s;
}
.btn:hover {
  background: #000;
  color: #fff;
  text-decoration: none;
}
.btn-sm { padding: 0.35rem 0.8rem; font-size: 0.65rem; }

/* ============================================================
   Article Detail Page
   ============================================================ */
.article-detail {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

.article-header {
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 2px solid #000;
}

.article-category {
  font-family: system-ui, sans-serif;
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: #8b1a1a;
  margin-bottom: 0.6rem;
}

.article-title {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 1.12;
  color: #000;
  margin-bottom: 1rem;
}

.article-authors {
  font-size: 1.05rem;
  color: #1a1a1a;
  margin-bottom: 0.5rem;
}
.author-name { font-weight: 600; }
.author-affil {
  font-size: 0.7em;
  color: #1a5c8a;
  vertical-align: super;
  margin-left: 1px;
}

.article-affiliations {
  font-size: 0.85rem;
  color: #767676;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.article-meta {
  font-family: system-ui, sans-serif;
  font-size: 0.7rem;
  color: #767676;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Abstract */
.abstract-block {
  margin-bottom: 2.5rem;
  padding: 0 0 1.5rem;
  border-bottom: 1px solid #d5d0c8;
}

.abstract-label {
  font-family: system-ui, sans-serif;
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: #000;
  margin-bottom: 0.6rem;
}

.abstract-text {
  font-size: 1rem;
  line-height: 1.65;
  color: #333;
  margin-bottom: 0.75rem;
}

.keywords-line {
  font-size: 0.85rem;
  color: #767676;
}
.keywords-line strong {
  font-family: system-ui, sans-serif;
  font-weight: 600;
  color: #555;
  text-transform: uppercase;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
}

/* TOC */
.article-toc {
  font-family: system-ui, sans-serif;
  font-size: 0.85rem;
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid #d5d0c8;
}
.article-toc summary {
  font-weight: 600;
  color: #000;
  cursor: pointer;
  list-style: none;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.75rem;
}
.article-toc summary::before { content: "▸ "; }
.article-toc details[open] summary::before { content: "▾ "; }
.article-toc .toc {
  margin-top: 0.8rem;
  font-size: 0.85rem;
  line-height: 1.8;
}
.article-toc .toc ul { padding-left: 1.2rem; }
.article-toc .toc a { color: #555; }
.article-toc .toc a:hover { color: #000; }

/* Article Body */
.article-body {
  font-size: 1.05rem;
  line-height: 1.75;
  color: #1a1a1a;
}

.article-body h2 {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, -apple-system, sans-serif;
  font-size: 1.55rem;
  font-weight: 700;
  color: #000;
  margin: 2.5rem 0 0.8rem;
  line-height: 1.25;
}

.article-body h3 {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, -apple-system, sans-serif;
  font-size: 1.2rem;
  font-weight: 700;
  color: #000;
  margin: 2rem 0 0.6rem;
  line-height: 1.3;
}

.article-body h4 {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, -apple-system, sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: #333;
  margin: 1.5rem 0 0.5rem;
}

.article-body p {
  margin: 0 0 1em;
  text-indent: 0;
}
.article-body p + p {
  text-indent: 2em;
  margin-top: -0.35em;
}

.article-body ul,
.article-body ol {
  margin: 0 0 1em;
  padding-left: 2rem;
}
.article-body li { margin-bottom: 0.3rem; }

.article-body sup a.footnote-ref {
  color: #1a5c8a;
  text-decoration: none;
  font-weight: 600;
}
.article-body sup a.footnote-ref:hover {
  color: #8b1a1a;
  text-decoration: underline;
}

.article-body blockquote {
  margin: 2rem 0;
  padding: 0.8rem 1.5rem;
  border-left: 3px solid #000;
  font-style: italic;
  color: #444;
}
.article-body blockquote p:last-child { margin-bottom: 0; }

.article-body img {
  margin: 2rem auto;
  max-width: 100%;
}

/* Numbered figures & tables */
.article-body figure.numbered-fig,
.article-body figure.numbered-tbl {
  margin: 2rem 0;
  text-align: center;
}

.article-body figure.numbered-fig img {
  margin: 0 auto 0.6rem;
}

.article-body figure.numbered-fig figcaption,
.article-body figure.numbered-tbl figcaption {
  font-family: "Crimson Text", "Songti SC", "STSongti", "Noto Serif CJK SC", "SimSun", Georgia, serif;
  font-size: 0.9rem;
  color: #555;
  text-align: center;
}

.article-body figure.numbered-tbl table {
  margin: 0 auto;
}

/* Cross-reference links */
a.xref {
  color: #1a5c8a;
  text-decoration: none;
  font-weight: 600;
}
a.xref:hover { text-decoration: underline; }

/* Tables — classic academic style */
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.9rem;
  line-height: 1.5;
}

.article-body thead {
  border-top: 2px solid #000;
  border-bottom: 1px solid #000;
}

.article-body th {
  font-family: system-ui, sans-serif;
  font-weight: 600;
  text-align: left;
  padding: 0.5rem 0.75rem;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.article-body td {
  padding: 0.45rem 0.75rem;
  border-bottom: 1px solid #e8e3da;
}

/* Code */
.article-body code {
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 0.85em;
  background: #f5f2ed;
  padding: 0.1em 0.35em;
  color: #333;
}

.article-body pre {
  background: #f5f2ed;
  padding: 1.2rem 1.4rem;
  overflow-x: auto;
  border: 1px solid #e8e3da;
  font-size: 0.82rem;
  line-height: 1.6;
  margin: 1.5rem 0;
}
.article-body pre code {
  background: transparent;
  padding: 0;
  font-size: inherit;
  border: none;
}

/* Footnotes / Bibliography */
.article-body .footnotes {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 2px solid #000;
}
.article-body .footnotes hr { display: none; }
.article-body .footnotes ol {
  padding-left: 1.5rem;
  font-size: 0.85rem;
  line-height: 1.65;
  color: #555;
}
.article-body .footnotes li { margin-bottom: 0.5rem; }
.article-body .footnotes li p { margin: 0; text-indent: 0; font-size: 0.85rem; line-height: 1.65; }
.article-body .footnotes .footnote-backref {
  font-size: 0.8em;
  color: #aaa;
  margin-left: 0.3em;
  text-decoration: none;
}
.article-body .footnotes .footnote-backref:hover { color: #1a5c8a; }

/* Article footer */
.article-footer-tags {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid #d5d0c8;
  font-family: system-ui, sans-serif;
  font-size: 0.78rem;
  color: #767676;
}
.article-footer-tags strong { color: #555; text-transform: uppercase; font-size: 0.68rem; }

/* Prev / Next */
.article-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid #d5d0c8;
  gap: 2rem;
}
.prev-article, .next-article {
  display: flex;
  flex-direction: column;
  max-width: 48%;
  text-decoration: none;
  color: #1a1a1a;
}
.next-article { text-align: right; margin-left: auto; }

.nav-label {
  font-family: system-ui, sans-serif;
  font-size: 0.62rem;
  color: #767676;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 2px;
  font-weight: 600;
}
.nav-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: #1a5c8a;
  font-family: Georgia, serif;
}
.prev-article:hover .nav-title,
.next-article:hover .nav-title { text-decoration: underline; }

/* ============================================================
   Archive, Category, Tag Pages
   ============================================================ */
.page-heading {
  margin-bottom: 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid #000;
}

.page-heading-title {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.75rem;
  font-weight: 700;
  color: #000;
}
.page-heading-title em {
  color: #1a5c8a;
  font-style: normal;
}

.page-heading-meta {
  font-family: system-ui, sans-serif;
  font-size: 0.7rem;
  color: #767676;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 0.3rem;
}

/* Archive grouping */
.archive-group { margin-bottom: 2rem; }

.archive-group-title {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: #000;
  margin-bottom: 0.6rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid #d5d0c8;
}

.archive-list {
  list-style: none;
}

.archive-list li {
  padding: 0.45rem 0;
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  font-size: 0.95rem;
  border-bottom: 1px solid #f0ede7;
}

.archive-date {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  color: #aaa;
  min-width: 2.2rem;
  text-align: right;
}

.archive-list a { color: #333; }
.archive-list a:hover { color: #000; }

.archive-cat {
  font-family: system-ui, sans-serif;
  font-size: 0.6rem;
  color: #aaa;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-left: auto;
  white-space: nowrap;
}

/* Compact list for category/tag pages */
.compact-list {
  display: flex;
  flex-direction: column;
}

.compact-item {
  padding: 1.3rem 0;
  border-bottom: 1px solid #e8e3da;
  display: flex;
  gap: 1.5rem;
}
.compact-item:first-child { padding-top: 0; }

.compact-thumb {
  flex-shrink: 0;
  width: 120px;
  height: 80px;
  background: #f5f2ed;
  overflow: hidden;
}
.compact-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.compact-content { flex: 1; }

.compact-title {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 0.2rem;
}
.compact-title a { color: #000; }
.compact-title a:hover { color: #1a5c8a; text-decoration: none; }

.compact-authors {
  font-size: 0.85rem;
  color: #555;
  margin-bottom: 0.2rem;
}

.compact-abstract {
  font-size: 0.88rem;
  line-height: 1.5;
  color: #666;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin: 0;
}

.compact-footer {
  display: flex;
  gap: 1rem;
  margin-top: 0.4rem;
  font-family: system-ui, sans-serif;
  font-size: 0.7rem;
  color: #aaa;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

@media (max-width: 640px) {
  .compact-thumb { display: none; }
}

/* Tags all page */
.tags-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 2rem;
}

.tag-group {}
.tag-group-title {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid #d5d0c8;
  display: flex;
  justify-content: space-between;
}
.tag-group-title a { color: #000; }
.tag-group-title a:hover { color: #1a5c8a; text-decoration: none; }
.tag-count {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7rem;
  color: #aaa;
  font-weight: 400;
}

.tag-group-list {
  list-style: none;
}
.tag-group-list li {
  padding: 0.35rem 0;
  border-bottom: 1px solid #f5f2ed;
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
}
.tag-group-list a { color: #555; }
.tag-group-list a:hover { color: #000; }
.tag-group-list span {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7rem;
  color: #ccc;
  white-space: nowrap;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  border-top: 4px solid #000;
  margin-top: 4rem;
  padding: 2rem 1.5rem;
  background: #1a1a2e;
  color: rgba(255,255,255,0.6);
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 0.78rem;
}

.footer-inner {
  max-width: 1140px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 2rem;
}

.footer-brand-name {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.25rem;
}
.footer-brand-desc {
  color: rgba(255,255,255,0.5);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, -apple-system, sans-serif;
}

.footer-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.footer-col-title {
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: rgba(255,255,255,0.4);
  margin-bottom: 0.6rem;
}

.footer-col-links {
  list-style: none;
}
.footer-col-links li { margin-bottom: 0.3rem; }
.footer-col-links a {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.6);
}
.footer-col-links a:hover { color: #fff; }

.footer-bottom {
  max-width: 1140px;
  margin: 1.5rem auto 0;
  padding-top: 1rem;
  border-top: 1px solid rgba(255,255,255,0.15);
  font-size: 0.7rem;
  color: rgba(255,255,255,0.35);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-align: center;
}

@media (max-width: 768px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .footer-columns {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .footer-columns { grid-template-columns: 1fr; }
}

/* ============================================================
   KaTeX
   ============================================================ */
.katex { font-size: 1.05em; }
.katex-display {
  margin: 1.5rem 0 !important;
  overflow-x: auto;
  overflow-y: hidden;
}

/* ============================================================
   Pygments — journal-appropriate code highlighting
   ============================================================ */
.highlight { background: transparent; }
.highlight .hll { background-color: #f5f2ed; }
.highlight .c  { color: #999; font-style: italic; }
.highlight .err { color: #8b1a1a; }
.highlight .k  { color: #000; font-weight: 600; }
.highlight .o  { color: #555; }
.highlight .ch { color: #999; font-style: italic; }
.highlight .cm { color: #999; font-style: italic; }
.highlight .cp { color: #8b1a1a; }
.highlight .cpf { color: #999; font-style: italic; }
.highlight .c1 { color: #999; font-style: italic; }
.highlight .cs { color: #999; font-style: italic; }
.highlight .gd { color: #8b1a1a; }
.highlight .ge { font-style: italic; }
.highlight .ges { font-weight: 600; font-style: italic; }
.highlight .gr { color: #8b1a1a; }
.highlight .gh { color: #555; font-weight: 600; }
.highlight .gi { color: #2d6a4f; }
.highlight .go { color: #767676; }
.highlight .gp { color: #555; font-weight: 600; }
.highlight .gs { font-weight: 600; }
.highlight .gu { color: #8b1a1a; font-weight: 600; }
.highlight .gt { color: #1a5c8a; }
.highlight .kc { color: #000; font-weight: 600; }
.highlight .kd { color: #000; font-weight: 600; }
.highlight .kn { color: #000; font-weight: 600; }
.highlight .kp { color: #000; }
.highlight .kr { color: #000; font-weight: 600; }
.highlight .kt { color: #8b1a1a; }
.highlight .m  { color: #2d6a4f; }
.highlight .s  { color: #2d6a4f; }
.highlight .na { color: #555; }
.highlight .nb { color: #1a5c8a; }
.highlight .nc { color: #8b1a1a; font-weight: 600; }
.highlight .no { color: #8b1a1a; }
.highlight .nd { color: #1a5c8a; }
.highlight .ni { color: #555; font-weight: 600; }
.highlight .ne { color: #8b1a1a; font-weight: 600; }
.highlight .nf { color: #1a5c8a; }
.highlight .nl { color: #555; }
.highlight .nn { color: #8b1a1a; font-weight: 600; }
.highlight .nt { color: #1a5c8a; font-weight: 600; }
.highlight .nv { color: #1a5c8a; }
.highlight .ow { color: #1a5c8a; font-weight: 600; }
.highlight .w  { color: #ccc; }
.highlight .mb { color: #2d6a4f; }
.highlight .mf { color: #2d6a4f; }
.highlight .mh { color: #2d6a4f; }
.highlight .mi { color: #2d6a4f; }
.highlight .mo { color: #2d6a4f; }
.highlight .sa { color: #2d6a4f; }
.highlight .sb { color: #2d6a4f; }
.highlight .sc { color: #2d6a4f; }
.highlight .dl { color: #2d6a4f; }
.highlight .sd { color: #999; font-style: italic; }
.highlight .s2 { color: #2d6a4f; }
.highlight .se { color: #8b1a1a; font-weight: 600; }
.highlight .sh { color: #2d6a4f; }
.highlight .si { color: #8b1a1a; font-weight: 600; }
.highlight .sx { color: #1a5c8a; }
.highlight .sr { color: #8b1a1a; }
.highlight .s1 { color: #2d6a4f; }
.highlight .ss { color: #1a5c8a; }
.highlight .bp { color: #1a5c8a; }
.highlight .fm { color: #1a5c8a; }
.highlight .vc { color: #1a5c8a; }
.highlight .vg { color: #1a5c8a; }
.highlight .vi { color: #1a5c8a; }
.highlight .vm { color: #1a5c8a; }
.highlight .il { color: #2d6a4f; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 640px) {
  html { font-size: 16px; }
  .masthead-journal-name { font-size: 1.5rem; }
  .nav-inner { height: auto; padding: 0.5rem 1rem; flex-wrap: wrap; }
  .nav-links a { padding: 0.5rem 0.6rem; font-size: 0.65rem; }
  .article-title { font-size: 1.6rem; }
  .article-detail { padding: 2rem 1rem 3rem; }
  .featured-title { font-size: 1.4rem; }
  .article-nav { flex-direction: column; gap: 1rem; }
  .prev-article, .next-article { max-width: 100%; text-align: left; }
  .next-article { margin-left: 0; text-align: left; }
}