:root {
  --font-body: "Noto Sans CJK SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", "Heiti SC", "Segoe UI", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "Cascadia Mono", "Consolas", "Menlo", "Courier New", monospace;
  --color-ink: #1f1f1f;
  --color-muted: #5a5a5a;
  --color-accent: #8c0000;
  --color-accent-dark: #5f0000;
  --color-accent-soft: #fdf2f2;
  --color-border: #d8dce2;
  --color-surface: #ffffff;
  --color-bg: #f7f8fa;
  --color-inst: #136309;
  --color-tag: #634b09;
  --color-link: #0b57d0;
  --max-width: 1020px;
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-ink);
  background-color: var(--color-bg);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

code, pre {
  font-family: var(--font-mono);
}

code {
  background-color: #eef0f3;
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.9em;
}

.page-shell {
  max-width: var(--max-width);
  margin: 0 auto;
  background-color: var(--color-surface);
  min-height: 100vh;
  box-shadow: 0 0 24px rgba(0, 0, 0, 0.05);
}

/* Header & Navigation */
.site-header {
  text-align: center;
  padding: 22px 20px 14px;
}

.site-header h1 {
  margin: 0 0 6px;
  font-size: 1.85rem;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.site-header .subtitle {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  background-color: var(--color-accent);
  padding: 0 12px;
}

.site-nav a {
  color: #ffffff;
  padding: 10px 16px;
  font-size: 0.94rem;
  font-weight: 500;
  text-decoration: none;
  transition: background-color 0.15s ease;
}

.site-nav a:hover,
.site-nav a.active {
  background-color: var(--color-accent-dark);
  color: #ffffff;
  text-decoration: none;
}

/* Main Content */
.content-wrap {
  padding: 20px 24px 36px;
}

.intro-section p {
  margin: 0 0 10px;
}

.archive-banner {
  background-color: #fff8e6;
  border-left: 4px solid #d97706;
  padding: 12px 16px;
  margin: 14px 0 20px;
  border-radius: 4px;
  font-size: 0.95rem;
}

/* Summary Stats & Year Jump */
.stats-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
  margin: 14px 0 12px;
  padding: 10px 14px;
  background-color: #f8f9fb;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.9rem;
}

.stats-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  color: var(--color-muted);
}

.stats-metrics strong {
  color: var(--color-ink);
}

.year-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  align-items: center;
}

.year-jump-label {
  font-size: 0.82rem;
  color: var(--color-muted);
  margin-right: 2px;
}

.year-pill {
  display: inline-block;
  padding: 2px 8px;
  font-size: 0.8rem;
  border-radius: 12px;
  background-color: #eef0f4;
  color: var(--color-ink);
  text-decoration: none;
}

.year-pill:hover {
  background-color: var(--color-accent);
  color: #ffffff;
  text-decoration: none;
}

/* Collapsible Bibliometrics Drawer */
.metrics-drawer {
  margin: 0 0 14px;
  background-color: #f8f9fb;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  overflow: hidden;
}

.metrics-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 12px;
  padding: 8px 14px;
  cursor: pointer;
  user-select: none;
  font-size: 0.88rem;
  list-style: none;
}

.metrics-summary-left {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
}

.metrics-summary-controls {
  display: none;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.metrics-drawer[open] .metrics-summary-controls {
  display: flex;
}

.btn-sm {
  height: 24px;
  padding: 0 10px;
  font-size: 0.78rem;
}

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

.metrics-summary:hover {
  background-color: #f0f2f6;
}

.metrics-summary-title {
  font-weight: 600;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.metrics-summary-title::before {
  content: "▸";
  font-size: 0.9rem;
  transition: transform 0.15s ease;
}

.metrics-drawer[open] .metrics-summary-title::before {
  transform: rotate(90deg);
}

.metrics-drawer[open] .metrics-summary {
  border-bottom: 1px solid var(--color-border);
  background-color: #f1f3f7;
}

.metrics-summary-sub {
  font-size: 0.8rem;
  color: var(--color-muted);
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  padding: 12px;
  background-color: #ffffff;
}

.metric-card {
  border: 1px solid #e5e8ec;
  border-radius: 5px;
  padding: 10px 12px;
  background-color: #fafbfc;
}

.metric-card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px;
  margin-bottom: 8px;
  padding-bottom: 5px;
  border-bottom: 1px solid #eaedf1;
}

.metric-card-title {
  margin: 0;
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--color-ink);
}

.metric-card-meta {
  font-size: 0.75rem;
  color: var(--color-muted);
  white-space: nowrap;
}

.metric-bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.metric-row {
  display: grid;
  grid-template-columns: minmax(90px, 46%) 1fr auto;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  padding: 2px 4px;
  border-radius: 3px;
  cursor: pointer;
}

.metric-row:hover {
  background-color: var(--color-accent-soft);
}

.metric-row.active {
  background-color: var(--color-accent-soft);
  font-weight: 600;
}

.metric-label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--color-ink);
}

.metric-bar-track {
  height: 8px;
  background-color: #e9ecef;
  border-radius: 4px;
  overflow: hidden;
}

.metric-bar-fill {
  height: 100%;
  background-color: var(--color-accent);
  border-radius: 4px;
}

.metric-bar-fill.fill-inst {
  background-color: #1b6ca8;
}

.metric-bar-fill.fill-journal {
  background-color: #2e7d32;
}

.metric-bar-fill.fill-tag {
  background-color: #8d5b16;
}

.metric-bar-fill.fill-author {
  background-color: #5e35b1;
}

.metric-bar-fill.fill-first-author {
  background-color: #00796b;
}

.metric-val {
  font-variant-numeric: tabular-nums;
  color: var(--color-muted);
  font-size: 0.75rem;
  min-width: 22px;
  text-align: right;
}

@media (max-width: 900px) {
  .metrics-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Sticky Search & Filter Bar */
.search-panel {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: #e9ecef;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 10px 12px;
  margin: 0 -24px 16px;
}

.search-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.search-controls select,
.search-controls input[type="text"] {
  height: 30px;
  padding: 2px 8px;
  font-size: 0.86rem;
  font-family: inherit;
  border: 1px solid #b8bfc7;
  border-radius: 4px;
  background-color: #ffffff;
  color: var(--color-ink);
}

.search-controls select {
  flex: 1 1 110px;
  min-width: 105px;
}

.search-controls input[type="text"] {
  flex: 1.5 1 160px;
  min-width: 145px;
}

.btn {
  flex: 0 0 auto;
  margin-left: auto;
  height: 30px;
  padding: 0 14px;
  font-size: 0.85rem;
  font-family: inherit;
  font-weight: 500;
  border: 1px solid #8c0000;
  border-radius: 4px;
  background-color: var(--color-accent);
  color: #ffffff;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

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

.btn-secondary {
  background-color: #ffffff;
  color: var(--color-ink);
  border-color: #b8bfc7;
}

.btn-secondary:hover {
  background-color: #f1f3f5;
}

.filter-status {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: 6px;
  font-size: 0.82rem;
  color: var(--color-muted);
}

.active-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background-color: var(--color-accent-soft);
  border: 1px solid #e5b8b8;
  color: var(--color-accent-dark);
  padding: 1px 8px;
  border-radius: 12px;
  font-size: 0.78rem;
  cursor: pointer;
}

.filter-chip:hover {
  background-color: #f9dada;
}

/* Publication List */
.year-group {
  margin-bottom: 24px;
}

.year-header {
  position: sticky;
  top: var(--search-panel-height, 68px);
  z-index: 100;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(4px);
  padding: 8px 6px;
  margin: 0 0 8px;
  border-bottom: 2px solid #d0d5dd;
}

.year-header h3 {
  margin: 0;
  font-size: 1.25rem;
  color: var(--color-ink);
}

.year-count {
  font-size: 0.88rem;
  font-weight: 400;
  color: var(--color-muted);
  margin-left: 6px;
}

.back-top {
  font-size: 0.8rem;
  color: var(--color-accent);
}

.bib-entry {
  padding: 10px 6px 10px 22px;
  border-bottom: 1px solid #f0f2f5;
}

.bib-entry:hover {
  background-color: #fafbfc;
}

.bib-title {
  font-weight: 700;
  text-indent: -14px;
  line-height: 1.45;
  margin-bottom: 3px;
}

.bib-citation {
  font-size: 0.95rem;
  color: #2b2b2b;
  margin-bottom: 4px;
  line-height: 1.5;
}

.bib-journal {
  font-style: italic;
  cursor: pointer;
}

.bib-journal:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.bib-author-item {
  cursor: pointer;
}

.bib-author-item:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.bib-volume {
  font-weight: 700;
}

.bib-meta {
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--color-muted);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
}

.bib-meta a.ext-link {
  color: var(--color-link);
}

.bib-action-btn {
  background: none;
  border: none;
  padding: 0;
  font: inherit;
  color: var(--color-link);
  cursor: pointer;
}

.bib-action-btn:hover {
  text-decoration: underline;
}

.bib-inst {
  color: var(--color-inst);
  cursor: pointer;
}

.bib-inst:hover {
  text-decoration: underline;
}

.bib-tag-label {
  font-weight: 700;
  color: #444;
}

.bib-tag {
  color: var(--color-tag);
  font-style: italic;
  cursor: pointer;
}

.bib-tag:hover {
  text-decoration: underline;
}

.bib-raw-drawer {
  display: none;
  margin-top: 8px;
  padding: 10px 12px;
  background-color: #f4f6f8;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: 12px;
  line-height: 1.45;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.bib-raw-drawer.open {
  display: block;
}

.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--color-muted);
}

/* Info / About Sections */
.info-section {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--color-border);
}

.info-section h2 {
  font-size: 1.35rem;
  margin: 0 0 10px;
}

.info-section h3 {
  font-size: 1.08rem;
  margin: 16px 0 8px;
}

.code-block {
  background-color: #f4f6f8;
  border-left: 4px solid var(--color-accent);
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
  overflow-x: auto;
  white-space: pre;
  margin: 10px 0 14px;
}

/* Conference Archive Specifics */
.conf-toc {
  width: 100%;
  max-width: 540px;
  border-collapse: collapse;
  margin: 12px 0 20px;
  font-size: 0.92rem;
}

.conf-toc th,
.conf-toc td {
  border: 1px solid var(--color-border);
  padding: 6px 10px;
  text-align: center;
}

.conf-toc tr:nth-child(even) {
  background-color: #f4f6f8;
}

.conf-card {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  margin-bottom: 18px;
  overflow: hidden;
  background-color: #ffffff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
}

.conf-card-header {
  background-color: #607d8b;
  color: #ffffff;
  padding: 10px 16px;
}

.conf-card-header h3 {
  margin: 0;
  font-size: 1.1rem;
}

.conf-card-body {
  padding: 14px 18px;
}

.conf-card-footer {
  background-color: #607d8b;
  padding: 4px 14px;
  text-align: right;
  font-size: 0.85rem;
}

.conf-card-footer a {
  color: #ffffff;
}

.zoom3 {
  transition: transform 0.2s ease;
  max-width: 240px;
  margin: 8px auto;
  display: block;
  border-radius: 4px;
}

.zoom3:hover {
  transform: scale(2.6);
  transform-origin: bottom center;
  position: relative;
  z-index: 50;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

.site-footer {
  border-top: 1px solid var(--color-border);
  background-color: #f1f3f5;
  text-align: center;
  padding: 14px 16px;
  font-size: 0.84rem;
  color: var(--color-muted);
}

@media (max-width: 680px) {
  .content-wrap {
    padding: 14px 14px 28px;
  }
  .search-panel {
    position: static;
    margin: 0 -14px 14px;
  }
  .year-header {
    top: 0;
  }
  .search-controls select,
  .search-controls input[type="text"] {
    flex: 1 1 46%;
    min-width: 130px;
    max-width: none;
  }
  .metrics-grid {
    grid-template-columns: 1fr;
  }
}