/* ═══════════════════════════════════════════════════════════════
   UJIYARI — Resources Section Styles
   PYQ Bank, Schemes, Legislation, Reports, Static GK Reference
═══════════════════════════════════════════════════════════════ */

/* ── Section intro banner ────────────────────────────────────── */
.resource-intro {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  padding: var(--space-6);
  background: linear-gradient(135deg, #f0f9ff 0%, #fff7ed 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-6);
}

.resource-intro__icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  flex-shrink: 0;
}

.resource-intro__icon--pyq       { background: linear-gradient(135deg, #ede9fe, #ddd6fe); }
.resource-intro__icon--schemes   { background: linear-gradient(135deg, #dcfce7, #bbf7d0); }
.resource-intro__icon--legis     { background: linear-gradient(135deg, #fef3c7, #fde68a); }
.resource-intro__icon--reports   { background: linear-gradient(135deg, #dbeafe, #bfdbfe); }
.resource-intro__icon--reference { background: linear-gradient(135deg, #fce7f3, #fbcfe8); }

.resource-intro__text h2 {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-brand);
  margin: 0 0 var(--space-1) 0;
}

.resource-intro__text p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin: 0;
}

/* ── Status badges ────────────────────────────────────────────── */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: var(--font-bold);
  text-transform: capitalize;
  white-space: nowrap;
}

.status-badge--active       { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }
.status-badge--modified     { background: #fef9c3; color: #854d0e; border: 1px solid #fde68a; }
.status-badge--discontinued { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }
.status-badge--merged       { background: #e0e7ff; color: #3730a3; border: 1px solid #c7d2fe; }
.status-badge--enacted      { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }
.status-badge--pending      { background: #fef9c3; color: #854d0e; border: 1px solid #fde68a; }
.status-badge--lapsed       { background: #f3f4f6; color: #6b7280; border: 1px solid #e5e7eb; }
.status-badge--withdrawn    { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }

/* ── Ministry badge ───────────────────────────────────────────── */
.ministry-badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: var(--font-semibold);
  background: #eff6ff;
  color: #1e40af;
  border: 1px solid #bfdbfe;
  white-space: nowrap;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Quick info grid ──────────────────────────────────────────── */
.quick-info {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-4);
  padding: var(--space-5) var(--space-6);
  background: linear-gradient(135deg, #f8fafc, #f0f9ff);
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-6);
}

.quick-info__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.quick-info__label {
  font-size: 10px;
  font-weight: var(--font-bold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
}

.quick-info__value {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  word-break: break-word;
}

/* ── Year filter pills ────────────────────────────────────────── */
.year-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.year-filter__btn {
  padding: var(--space-1) var(--space-3);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.year-filter__btn:hover {
  border-color: var(--color-brand-light);
  color: var(--color-brand-light);
}

.year-filter__btn.active {
  background: var(--color-brand);
  color: white;
  border-color: var(--color-brand);
}

/* ── Rank change indicator ────────────────────────────────────── */
.rank-change {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  font-size: 11px;
  font-weight: var(--font-bold);
}

.rank-change--up   { color: #16a34a; }
.rank-change--down { color: #dc2626; }
.rank-change--same { color: #6b7280; }

/* ── PYQ option list ──────────────────────────────────────────── */
.pyq-options {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.pyq-option {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
}

.pyq-option:hover {
  border-color: var(--color-brand-light);
  background: #f0f9ff;
}

.pyq-option__letter {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-brand);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: var(--font-bold);
  flex-shrink: 0;
}

.pyq-option.is-correct {
  border-color: #16a34a;
  background: #f0fdf4;
}

.pyq-option.is-correct .pyq-option__letter {
  background: #16a34a;
}

.pyq-option.is-wrong {
  border-color: #dc2626;
  background: #fef2f2;
}

/* ── Resource card ────────────────────────────────────────────── */
.resource-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.resource-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-brand-light), var(--color-accent));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.resource-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: rgba(37, 99, 168, 0.15);
}

.resource-card:hover::before {
  opacity: 1;
}

.resource-card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  min-width: 0;
}

.resource-card__header .status-badge {
  flex-shrink: 0;
  margin-top: 2px;
}

.resource-card__title {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  line-height: var(--leading-snug);
  min-width: 0;
  overflow-wrap: break-word;
}

.resource-card__title a {
  color: inherit;
  text-decoration: none;
}

.resource-card__title a:hover {
  color: var(--color-brand-light);
}

.resource-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  margin-bottom: var(--space-3);
  row-gap: 6px;
}

.resource-card__excerpt {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: var(--space-3);
  min-height: 0;
}

.resource-card__excerpt:empty {
  display: none;
}

.resource-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
  min-width: 0;
}

.resource-card__footer .tag-list {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  max-height: 28px;
}

.resource-card__footer .btn {
  flex-shrink: 0;
}

/* Card type accents */
.resource-card--pyq::before     { background: linear-gradient(90deg, #7c3aed, #a78bfa); }
.resource-card--scheme::before  { background: linear-gradient(90deg, #16a34a, #4ade80); }
.resource-card--legis::before   { background: linear-gradient(90deg, #d97706, #fbbf24); }
.resource-card--report::before  { background: linear-gradient(90deg, #2563eb, #60a5fa); }

/* ── Inline meta pill ─────────────────────────────────────────── */
.meta-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 9px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: var(--font-bold);
  white-space: nowrap;
  line-height: 1.2;
}

.meta-pill--year     { background: var(--color-brand); color: white; }
.meta-pill--type     { background: #f3f4f6; color: #374151; border: 1px solid #e5e7eb; text-transform: capitalize; }
.meta-pill--gs       { background: #fff7ed; color: #9a3412; border: 1px solid #fed7aa; }
.meta-pill--rank     { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }
.meta-pill--exam     { background: #f5f3ff; color: #6d28d9; border: 1px solid #ddd6fe; }
.meta-pill--edition  { background: var(--color-brand); color: white; }
.meta-pill--freq     { background: #f0fdf4; color: #166534; border: 1px solid #bbf7d0; text-transform: capitalize; }

/* ── Reference category cards ─────────────────────────────────── */
.ref-category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-4);
}

.ref-category-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5) var(--space-4);
  text-align: center;
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.ref-category-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-brand-light), var(--color-accent));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.ref-category-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: var(--color-brand-light);
}

.ref-category-card:hover::after { opacity: 1; }

.ref-category-card__icon {
  font-size: 2rem;
  margin-bottom: var(--space-2);
}

.ref-category-card__label {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  font-weight: var(--font-bold);
  color: var(--color-brand);
}

.ref-category-card__count {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* ── Filter group label ───────────────────────────────────────── */
.filter-group-label {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-text-muted);
  padding: var(--space-2) 0;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-right: var(--space-2);
}

/* ── Filter bar wrapper ───────────────────────────────────────── */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
  margin-bottom: var(--space-3);
}

/* ── Resource content grid ────────────────────────────────────── */
.resource-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

@media (min-width: 768px) {
  .resource-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1200px) {
  .resource-grid--3col {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ── Empty state ──────────────────────────────────────────────── */
.resource-empty {
  text-align: center;
  padding: var(--space-12) var(--space-6);
  background: var(--color-surface);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-xl);
}

.resource-empty__icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  opacity: 0.5;
}

.resource-empty__title {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-brand);
  margin-bottom: var(--space-2);
}

.resource-empty__text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 400px;
  margin: 0 auto;
  line-height: var(--leading-relaxed);
}

/* ── Section divider heading ──────────────────────────────────── */
.resource-section-heading {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-brand);
  border-bottom: 2px solid var(--color-border);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-5);
  position: relative;
}

.resource-section-heading::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 60px;
  height: 2px;
  background: var(--color-accent);
}

/* ── Key provisions numbered list ─────────────────────────────── */
.provisions-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.provisions-list li {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
}

.provisions-list__num {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-brand);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: var(--font-bold);
  flex-shrink: 0;
  margin-top: 1px;
}

/* ── Key findings dot list ────────────────────────────────────── */
.findings-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.findings-list li {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
}

.findings-list__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  flex-shrink: 0;
  margin-top: 6px;
}

/* ── Filter panel (groups all filter rows in a card) ─────────── */
.resource-filter-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-4) var(--space-5);
  margin-bottom: var(--space-6);
  box-shadow: var(--shadow-xs);
}

.resource-filter-panel__row {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-2) 0;
}

.resource-filter-panel__row + .resource-filter-panel__row {
  border-top: 1px solid var(--color-border-light, #f1f5f9);
}

.resource-filter-panel__row .filter-group-label {
  flex-shrink: 0;
  min-width: 70px;
  padding-top: var(--space-1);
}

.resource-filter-panel__buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  flex: 1;
}

/* ── Collapsible section (details/summary) ───────────────────── */
.resource-collapsible {
  margin-top: var(--space-8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--color-surface);
}

.resource-collapsible__trigger {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-brand);
  background: linear-gradient(135deg, #f8fafc 0%, #f0f9ff 100%);
  border-bottom: 1px solid transparent;
  transition: all var(--transition-fast);
  list-style: none;
  user-select: none;
}

.resource-collapsible__trigger::-webkit-details-marker { display: none; }

.resource-collapsible__trigger:hover {
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

.resource-collapsible__icon {
  font-size: 1.3rem;
  flex-shrink: 0;
}

.resource-collapsible__title {
  flex: 1;
}

.resource-collapsible__chevron {
  font-size: 1.2rem;
  font-weight: var(--font-bold);
  color: var(--color-text-muted);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.resource-collapsible[open] .resource-collapsible__trigger {
  border-bottom-color: var(--color-border);
}

.resource-collapsible[open] .resource-collapsible__chevron {
  transform: rotate(90deg);
}

.resource-collapsible__body {
  padding: var(--space-5) var(--space-5) var(--space-4);
}

.resource-collapsible__heading {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--font-bold);
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: var(--space-4) 0 var(--space-3);
}

.resource-collapsible__heading:first-child {
  margin-top: 0;
}

/* ── PYQ Download Grid (pure CSS Grid — no <table>) ──────────── */
.pyq-panel {
  background: var(--color-surface);
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xs);
}

.pyq-panel__head {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--font-bold);
  color: var(--color-brand);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 14px 20px;
  background: linear-gradient(135deg, #f8fafc 0%, #f0f9ff 100%);
  border-bottom: 2px solid #e2a84b;
}

.pyq-panel__foot {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  padding: 10px 20px;
  border-top: 1px solid #f1f5f9;
  background: #fafbfc;
}

.pyq-panel__foot a {
  color: var(--color-brand-light);
  font-weight: var(--font-semibold);
}

/* 3 columns: Year | Paper I | CSAT */
.pyq-grid--3col {
  display: grid;
  grid-template-columns: 80px 1fr 1fr;
}

/* 4 columns: Session | English | GK | Mathematics */
.pyq-grid--4col {
  display: grid;
  grid-template-columns: 80px 1fr 1fr 1fr;
}

/* 6 columns: Year | Essay | GS-I | GS-II | GS-III | GS-IV */
.pyq-grid--6col {
  display: grid;
  grid-template-columns: 80px repeat(5, 1fr);
}

/* Header cells */
.pyq-grid__hdr {
  background: #f0f4f8;
  color: #374151;
  font-size: 0.7rem;
  font-weight: var(--font-bold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 10px 12px;
  text-align: center;
  border-bottom: 1px solid #e2e8f0;
}

.pyq-grid__hdr:first-child {
  text-align: left;
  padding-left: 20px;
}

/* Year cell */
.pyq-grid__year {
  font-weight: var(--font-bold);
  color: var(--color-brand);
  font-size: var(--text-base);
  padding: 10px 12px 10px 20px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid #f1f5f9;
}

/* Data cell */
.pyq-grid__cell {
  padding: 10px 12px;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid #f1f5f9;
}

/* Zebra striping — every other row (each row = N columns) */
.pyq-grid--3col > :nth-child(n+4):nth-child(6n+4),
.pyq-grid--3col > :nth-child(n+4):nth-child(6n+5),
.pyq-grid--3col > :nth-child(n+4):nth-child(6n+6) {
  background: #f8fafc;
}

.pyq-grid--4col > :nth-child(n+5):nth-child(8n+5),
.pyq-grid--4col > :nth-child(n+5):nth-child(8n+6),
.pyq-grid--4col > :nth-child(n+5):nth-child(8n+7),
.pyq-grid--4col > :nth-child(n+5):nth-child(8n+8) {
  background: #f8fafc;
}

.pyq-grid--6col > :nth-child(n+7):nth-child(12n+7),
.pyq-grid--6col > :nth-child(n+7):nth-child(12n+8),
.pyq-grid--6col > :nth-child(n+7):nth-child(12n+9),
.pyq-grid--6col > :nth-child(n+7):nth-child(12n+10),
.pyq-grid--6col > :nth-child(n+7):nth-child(12n+11),
.pyq-grid--6col > :nth-child(n+7):nth-child(12n+12) {
  background: #f8fafc;
}

/* Download pill button */
.pyq-dl {
  display: inline-block;
  padding: 5px 16px;
  border-radius: var(--radius-full);
  background: #eff6ff;
  color: var(--color-brand-light);
  text-decoration: none;
  font-weight: var(--font-bold);
  font-size: 11px;
  letter-spacing: 0.03em;
  border: 1px solid #bfdbfe;
  transition: all var(--transition-fast);
}

.pyq-dl:hover {
  background: var(--color-brand-light);
  color: white;
  border-color: var(--color-brand-light);
  text-decoration: none;
}

/* N/A or "Soon" placeholder pill */
.pyq-dl--na {
  display: inline-block;
  padding: 5px 16px;
  border-radius: var(--radius-full);
  background: #f3f4f6;
  color: #9ca3af;
  font-weight: var(--font-semibold);
  font-size: 11px;
  letter-spacing: 0.03em;
  border: 1px solid #e5e7eb;
  cursor: default;
}

/* Mobile: scroll horizontally on small screens */
@media (max-width: 600px) {
  .pyq-grid--4col {
    grid-template-columns: 60px repeat(3, 90px);
    overflow-x: auto;
  }
  .pyq-grid--6col {
    grid-template-columns: 60px repeat(5, 70px);
    overflow-x: auto;
  }
  .pyq-grid__year { padding-left: 12px; }
  .pyq-grid__hdr:first-child { padding-left: 12px; }
  .pyq-dl { padding: 4px 10px; font-size: 10px; }
}

/* ── PYQ download panels ─────────────────────────────────────── */
.pyq-download-panels {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

/* ── Responsive adjustments ───────────────────────────────────── */
@media (max-width: 767px) {
  .resource-intro {
    flex-direction: column;
    text-align: center;
    padding: var(--space-5);
  }

  .quick-info {
    grid-template-columns: repeat(2, 1fr);
    padding: var(--space-4);
  }

  .ref-category-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
  }

  .ref-category-card {
    padding: var(--space-4) var(--space-3);
  }

  .resource-card__footer {
    flex-wrap: wrap;
  }

  .resource-card__footer .tag-list {
    max-height: none;
    flex-basis: 100%;
    margin-bottom: var(--space-1);
  }

  .resource-card__footer .btn {
    margin-left: auto;
  }

  .resource-filter-panel {
    padding: var(--space-3) var(--space-4);
  }

  .resource-filter-panel__row {
    flex-direction: column;
    gap: var(--space-1);
  }

  .resource-filter-panel__row .filter-group-label {
    min-width: auto;
  }

  .resource-collapsible__trigger {
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
  }

  .resource-collapsible__body {
    padding: var(--space-4);
  }
}

/* ── Papers page: Exam Schedule Accordion ──────────────────────── */
.papers-accordion {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-6);
  overflow: hidden;
}

.papers-accordion__trigger {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  cursor: pointer;
  background: linear-gradient(135deg, #f0f9ff, #fff7ed);
  border-bottom: 1px solid var(--color-border);
  list-style: none;
  user-select: none;
  transition: background var(--transition-fast);
}

.papers-accordion__trigger:hover {
  background: linear-gradient(135deg, #e0f2fe, #fef3c7);
}

.papers-accordion__trigger::-webkit-details-marker,
.papers-accordion__trigger::marker {
  display: none;
  content: '';
}

.papers-accordion__title {
  font-size: var(--text-base);
  font-weight: var(--font-bold);
  color: var(--color-brand);
  flex: 1;
}

.papers-accordion__src {
  font-size: var(--text-xs);
  color: var(--color-brand-light);
  text-decoration: underline;
  white-space: nowrap;
}

.papers-accordion__hint {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: var(--font-normal);
  white-space: nowrap;
}

.papers-accordion[open] .papers-accordion__hint {
  display: none;
}

.papers-accordion__chevron {
  width: 20px;
  height: 20px;
  color: var(--color-text-secondary);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.papers-accordion[open] > .papers-accordion__trigger .papers-accordion__chevron {
  transform: rotate(180deg);
}

.papers-accordion:not([open]) > .papers-accordion__trigger {
  border-bottom: none;
}

.papers-accordion__body {
  padding: var(--space-4) var(--space-5);
}

/* ── Papers page: Sticky tab bar ───────────────────────────────── */
.papers-tab-bar {
  position: sticky;
  top: var(--header-height, 64px);
  z-index: 100;
  background: var(--color-surface);
  box-shadow: none;
  transition: box-shadow 0.2s ease;
}

.papers-tab-bar.is-stuck {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
  border-color: transparent;
}

@media (max-width: 768px) {
  .papers-accordion__trigger {
    padding: var(--space-3) var(--space-4);
  }

  .papers-accordion__body {
    padding: var(--space-3);
  }

  .papers-accordion__src {
    display: none;
  }
}