/* ===== research-papers.css =====
   Dedicated styles for PPRI Research Reports.
   Institutional Think-Tank design system.
   ===== */

/* Ensure sticky elements function properly without overflow-x clipping context */
html,
body {
  overflow-x: clip !important;
}

/* -- Reading Progress Bar -- */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  z-index: 1001;
  transition: width 0.1s ease-out;
}

/* -- KPI Stat Ribbon -- */
.kpi-ribbon {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin: 0 0 36px;
}
.kpi-card {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-top: 4px solid var(--navy);
  border-radius: 8px;
  padding: 20px 16px;
  text-align: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.kpi-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(11, 29, 42, 0.08);
}
.kpi-card:nth-child(2) { border-top-color: #12645d; }
.kpi-card:nth-child(3) { border-top-color: var(--accent); }
.kpi-card:nth-child(4) { border-top-color: #854d0e; }
.kpi-value {
  display: block;
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--navy);
  line-height: 1.2;
}
.kpi-card:nth-child(2) .kpi-value { color: #12645d; }
.kpi-card:nth-child(3) .kpi-value { color: var(--navy); }
.kpi-card:nth-child(4) .kpi-value { color: #854d0e; }
.kpi-label {
  display: block;
  font-size: 0.82rem;
  color: #64748b;
  margin-top: 6px;
  line-height: 1.4;
}

/* -- Executive Summary Highlight (Institutional Ivory/Slate Palette) -- */
.exec-summary {
  background: #fafaf9;
  border: 1px solid #e7e5e4;
  border-left: 4px solid var(--navy);
  padding: 28px;
  border-radius: 6px;
  margin-bottom: 36px;
  box-shadow: 0 2px 10px rgba(11, 29, 42, 0.03);
}
.exec-summary h2,
.exec-summary h3 {
  margin-top: 0;
  color: var(--navy);
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}
.exec-summary p:last-child {
  margin-bottom: 0;
}

/* -- Fact-Check & Methodological Caveat (Refined Institutional Tone) -- */
.fact-check {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-left: 4px solid var(--accent);
  padding: 18px 22px;
  margin: 24px 0;
  border-radius: 6px;
  position: relative;
}
.fact-check::before {
  content: "DATA & METHODOLOGICAL CAVEAT";
  display: block;
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent2);
  margin-bottom: 6px;
}
.fact-check p,
.fact-check div {
  color: #334155;
  font-size: 0.92rem;
  line-height: 1.6;
  margin: 0;
}

/* -- Chart Container & Download Actions -- */
.chart-container {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  margin: 32px 0;
  box-shadow: 0 2px 12px rgba(11, 29, 42, 0.04);
}
.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 16px;
  gap: 16px;
}
.chart-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 4px;
}
.chart-subtitle {
  font-size: 0.82rem;
  color: var(--muted);
  margin: 0;
}
.chart-source {
  font-size: 0.75rem;
  color: #94a3b8;
  margin-top: 14px;
  padding-top: 10px;
  border-top: 1px solid #f1f5f9;
}
.data-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--navy);
  text-decoration: none;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--soft);
  white-space: nowrap;
  transition: all 0.2s ease;
}
.data-download:hover {
  background: var(--navy);
  color: #fff;
  border-color: var(--navy);
}

/* -- Source Cards -- */
.source-section {
  margin-top: 48px;
  padding-top: 36px;
  border-top: 2px solid var(--line);
}
.source-section h2 {
  margin-top: 0;
}
.source-grid {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}
.source-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow 0.2s;
}
.source-card:hover {
  box-shadow: 0 4px 12px rgba(11, 29, 42, 0.06);
}
.source-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  cursor: pointer;
  background: var(--soft);
  border: none;
  width: 100%;
  text-align: left;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--ink);
}
.source-card-header:hover {
  background: #edf1f5;
}
.source-card-toggle {
  font-size: 0.8rem;
  color: var(--muted);
  transition: transform 0.2s;
}
.source-card.open .source-card-toggle {
  transform: rotate(180deg);
}
.source-card-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}
.source-card.open .source-card-body {
  max-height: 200px;
  padding: 14px 18px;
}
.source-tier {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-right: 8px;
}
.tier-1 { background: #dcfce7; color: #166534; }
.tier-2 { background: #dbeafe; color: #1e40af; }
.tier-3 { background: #fef3c7; color: #92400e; }
.tier-4 { background: #fee2e2; color: #991b1b; }
.tier-5 { background: #f3e8ff; color: #6b21a8; }

.source-card-body p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}
.source-card-body a {
  color: var(--accent2);
  font-weight: 600;
  word-break: break-all;
}

/* -- Citation Footer & Interactive Toast -- */
.citation-footer {
  margin-top: 48px;
  padding: 32px;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.citation-footer h3 {
  margin-top: 0;
  font-size: 1.1rem;
}
.citation-text {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 16px 18px;
  font-size: 0.88rem;
  color: var(--ink);
  line-height: 1.7;
  position: relative;
}
.citation-copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #fff;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
}
.citation-copy-btn:hover {
  border-color: var(--navy);
  color: var(--navy);
}
.citation-copy-btn.copied {
  background: #12645d !important;
  color: #fff !important;
  border-color: #12645d !important;
}
.citation-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

/* -- Paper Series Navigation -- */
.series-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 2px solid var(--line);
}
.series-nav-card {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  transition: box-shadow 0.2s, border-color 0.2s;
}
.series-nav-card:hover {
  box-shadow: var(--shadow);
  border-color: var(--accent);
}
.series-nav-label {
  font-size: 0.72rem;
  font-weight: 850;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent2);
}
.series-nav-title {
  font-size: 1rem;
  font-weight: 700;
  margin-top: 4px;
  line-height: 1.3;
}
.series-nav-card.next {
  text-align: right;
}

/* -- Responsive Zebra-Striped Data Tables -- */
.data-table-wrap {
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}
.data-table thead {
  background: var(--navy);
  color: #fff;
}
.data-table th {
  padding: 12px 16px;
  text-align: left;
  font-weight: 700;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.data-table td {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  color: #334155;
}
.data-table tbody tr:nth-child(even) {
  background: #fbfcfd;
}
.data-table tbody tr:hover {
  background: #f1f5f9;
}
.data-table .num {
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}
.table-source {
  font-size: 0.75rem;
  color: #94a3b8;
  margin-top: 8px;
  padding: 0 4px;
}

/* -- Layout: Article on Left, Compact Sticky TOC on Right -- */
.paper-layout {
  display: grid !important;
  grid-template-columns: minmax(0, 1fr) 230px !important;
  gap: 36px !important;
  align-items: start !important;
  position: relative !important;
}

.paper-layout > article.prose-wide {
  grid-column: 1 !important;
  order: 1 !important;
  min-width: 0 !important;
}

.paper-layout > .toc {
  grid-column: 2 !important;
  order: 2 !important;
  position: sticky !important;
  top: 84px !important;
  align-self: start !important;
  width: 230px !important;
  max-height: calc(100vh - 104px) !important;
  display: flex !important;
  flex-direction: column !important;
  background: #ffffff !important;
  border: 1px solid var(--line) !important;
  border-radius: 8px !important;
  padding: 12px 14px 16px !important;
  box-shadow: 0 4px 16px rgba(11, 29, 42, 0.04) !important;
  overflow-y: auto !important;
  overscroll-behavior: contain !important;
  scrollbar-width: thin !important;
  scrollbar-color: #cbd5e1 transparent !important;
  z-index: 50 !important;
}
.toc::-webkit-scrollbar {
  width: 3px;
}
.toc::-webkit-scrollbar-track {
  background: transparent;
}
.toc::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 4px;
}
.toc::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

.toc-stepper-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 10px;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: -12px;
  background: #fff;
  z-index: 2;
  margin-top: -2px;
  padding-top: 2px;
}
.toc-stepper-title {
  font-size: 0.72rem;
  font-weight: 850;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--navy);
  margin: 0;
}
.toc-stepper-meta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.toc-progress-pill {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--accent2);
  background: #fbf8f2;
  border: 1px solid rgba(176, 138, 73, 0.25);
  border-radius: 999px;
  padding: 1px 6px;
}
.toc-top-btn {
  background: none;
  border: none;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--muted);
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
  transition: color 0.15s, background 0.15s;
}
.toc-top-btn:hover {
  color: var(--navy);
  background: var(--soft);
}

/* Clean Minimalist Documentation Navigation (No Bullets, Compact) */
.toc-stepper-list {
  position: relative;
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.toc-stepper-list::before {
  display: none !important;
}

.toc-item {
  position: relative;
  margin: 0;
  padding: 0;
}
.toc-bullet {
  display: none !important;
}

.toc-link {
  display: block;
  font-size: 0.76rem;
  line-height: 1.3;
  color: #475569;
  text-decoration: none;
  padding: 5px 8px;
  border-radius: 5px;
  border-left: 2.5px solid transparent;
  transition: all 0.15s ease;
  font-weight: 450;
}
.toc-link:hover {
  color: var(--navy);
  background: #f8fafc;
  border-left-color: #cbd5e1;
}

/* Active State: Clean Accent Border & Soft Background */
.toc-item.is-active .toc-link {
  color: var(--navy);
  font-weight: 650;
  background: #f1f5f9;
  border-left-color: var(--accent2);
}

/* Legacy .related-papers fallback */
.related-papers {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.related-papers h4 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent2);
  margin: 0 0 10px;
}
.related-link {
  display: block;
  padding: 6px 0;
  text-decoration: none;
  font-size: 0.82rem;
  color: var(--ink);
  border-bottom: 1px solid #f1f5f9;
  transition: color 0.2s;
}
.related-link:hover {
  color: var(--accent2);
}

/* -- Bottom Research Showcase Grid (Library + Treatises) -- */
.paper-showcase-section {
  margin-top: 56px;
  padding-top: 40px;
  border-top: 2px solid var(--line);
}
.showcase-header {
  margin-bottom: 24px;
}
.showcase-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 850;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent2);
  margin-bottom: 6px;
}
.showcase-header h3 {
  font-size: 1.45rem;
  color: var(--navy);
  margin: 0 0 6px;
}
.showcase-header p {
  color: var(--muted);
  font-size: 0.92rem;
  margin: 0;
}

.showcase-grid-reports {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-bottom: 42px;
}
.showcase-report-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 22px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
  position: relative;
}
.showcase-report-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 28px rgba(11, 29, 42, 0.08);
  border-color: var(--navy);
}
.showcase-card-meta {
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent2);
  margin-bottom: 6px;
}
.showcase-report-card h4 {
  font-size: 1.06rem;
  color: var(--navy);
  margin: 0 0 8px;
  line-height: 1.3;
}
.showcase-report-card p {
  font-size: 0.84rem;
  color: var(--muted);
  line-height: 1.5;
  margin: 0 0 14px;
  flex-grow: 1;
}
.showcase-card-link {
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--navy);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.showcase-grid-treatises {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.showcase-treatise-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 18px;
  background: #fbfcfd;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.2s;
}
.showcase-treatise-card:hover {
  background: #fff;
  border-color: var(--accent);
  box-shadow: 0 6px 18px rgba(11, 29, 42, 0.06);
  transform: translateY(-2px);
}
.showcase-treatise-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}
.showcase-treatise-code {
  font-family: monospace;
  font-size: 0.68rem;
  color: #94a3b8;
}
.showcase-treatise-time {
  font-size: 0.72rem;
  color: #64748b;
}
.showcase-treatise-card h5 {
  font-size: 0.94rem;
  color: var(--navy);
  margin: 0 0 6px;
  line-height: 1.35;
}
.showcase-treatise-card p {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.45;
  margin: 0 0 10px;
  flex-grow: 1;
}
.showcase-treatise-link {
  font-size: 0.74rem;
  font-weight: 750;
  color: var(--accent2);
}

/* -- Mobile TOC FAB & Slide-up Sheet (<= 768px) -- */
.mobile-toc-fab {
  display: none;
  position: fixed;
  bottom: 24px;
  right: 20px;
  z-index: 1050;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--navy);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 8px 24px rgba(11, 29, 42, 0.35);
  font-size: 0.82rem;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.2s, background 0.2s;
}
.mobile-toc-fab:active {
  transform: scale(0.96);
}
.mobile-toc-fab .toc-pct {
  background: var(--accent);
  color: #fff;
  padding: 1px 7px;
  border-radius: 999px;
  font-size: 0.7rem;
}

.mobile-toc-drawer {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 2000;
}
.mobile-toc-drawer.is-open {
  display: block;
}
.mobile-toc-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(11, 29, 42, 0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.mobile-toc-sheet {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  max-height: 80vh;
  background: #fff;
  border-radius: 20px 20px 0 0;
  padding: 20px 20px 32px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 -10px 35px rgba(0, 0, 0, 0.25);
  animation: sheet-slide-up 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}
@keyframes sheet-slide-up {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}
.mobile-sheet-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 14px;
}
.mobile-sheet-title {
  font-size: 0.94rem;
  font-weight: 850;
  color: var(--navy);
  margin: 0;
}
.mobile-sheet-close {
  background: var(--soft);
  border: 1px solid var(--line);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  color: var(--navy);
  cursor: pointer;
}
.mobile-sheet-body {
  overflow-y: auto;
  overscroll-behavior: contain;
  flex: 1;
}

/* -- Reading Time Badge -- */
.reading-time {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.78rem;
  color: #94a3b8;
}

/* -- Blockquotes inside papers -- */
.prose-wide blockquote {
  border-left: 3px solid var(--accent);
  margin: 24px 0;
  padding: 14px 20px;
  background: #f8fafc;
  border-radius: 0 4px 4px 0;
  font-size: 1rem;
  font-style: italic;
  color: #1e293b;
}
.prose-wide blockquote p {
  margin: 0;
  color: #1e293b;
}

/* -- Social Share -- */
.share-row {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}
.share-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 6px;
  text-decoration: none;
  color: var(--muted);
  font-size: 0.85rem;
  transition: all 0.2s;
}
.share-btn:hover {
  border-color: var(--navy);
  color: var(--navy);
  background: var(--soft);
}

/* -- Print Styles -- */
@media print {
  .reading-progress,
  .site-header,
  .site-footer,
  .toc,
  .mobile-toc-fab,
  .mobile-toc-drawer,
  .series-nav,
  .share-row,
  .citation-copy-btn,
  .data-download,
  .source-card-toggle { display: none !important; }

  .paper-layout {
    grid-template-columns: 1fr !important;
  }
  .paper-header {
    background: #fff !important;
    color: #000 !important;
    padding: 20px 0 !important;
  }
  .chart-container {
    break-inside: avoid;
    border: 1px solid #ccc;
    box-shadow: none;
  }
  .source-card-body {
    max-height: none !important;
    padding: 10px 18px !important;
  }
}

/* -- Responsive -- */
@media (max-width: 900px) {
  .paper-layout {
    grid-template-columns: 1fr !important;
  }
  .paper-layout > .toc {
    display: none !important;
  }
  .paper-layout > article.prose-wide {
    grid-column: 1 !important;
    order: 1 !important;
  }
  .mobile-toc-fab {
    display: inline-flex !important;
  }
  .kpi-ribbon {
    grid-template-columns: repeat(2, 1fr);
  }
  .series-nav {
    grid-template-columns: 1fr;
  }
  .showcase-grid-reports {
    grid-template-columns: 1fr;
  }
  .showcase-grid-treatises {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 768px) {
  .kpi-ribbon {
    grid-template-columns: 1fr;
  }
  .showcase-grid-treatises {
    grid-template-columns: 1fr;
  }
}