/**
 * Shared sidebar widget for Knowledge Treasury TOC / reference panels.
 * Used by Major Scientific Inventions and other charter-style TOC panels.
 *
 * Markup contract:
 *   <aside class="charter-sidebar toc-card">
 *     <div class="sidebar-widget" id="…">
 *       <div class="widget-head">…<button class="events-menu-toggle">…</button></div>
 *       <div class="widget-body">
 *         <ul class="timeline-list">…</ul>
 *       </div>
 *     </div>
 *   </aside>
 */

.charter-sidebar.toc-card {
  background: transparent !important;
  border: none !important;
  border-radius: 0 !important;
  padding: 0 !important;
  box-shadow: none !important;
  overflow: visible !important;
  max-height: none !important;
}

.charter-sidebar > .sidebar-widget {
  display: flex;
  flex-direction: column;
  width: 100%;
}

.charter-sidebar > .sidebar-widget > .widget-head {
  position: sticky;
  top: 0;
  z-index: 3;
  flex: 0 0 auto;
}

.charter-sidebar > .sidebar-widget > .widget-actions {
  flex: 0 0 auto;
}

.charter-sidebar > .sidebar-widget > .widget-body {
  flex: 1 1 auto;
  min-height: 0;
}

@media (min-width: 1061px) {
  .charter-sidebar > .sidebar-widget > .widget-body {
    max-height: none;
    overflow-y: auto;
    overscroll-behavior: contain;
  }
}

.sidebar-widget {
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--color-border-blue-faint);
  border-radius: 14px;
  box-shadow: 0 14px 28px rgba(0, 45, 82, 0.1);
  overflow: hidden;
}

.widget-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 20px;
  background: linear-gradient(135deg, var(--ink) 0%, var(--blue-dark) 58%, #2e9fd4 100%);
  border-bottom: 2px solid #f0c75e;
  color: var(--white);
  font-family: var(--font-serif);
  font-size: 12.6px;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.widget-head > span,
.widget-head__title {
  align-items: center;
  display: inline-flex;
  font: inherit;
  gap: 8px;
  letter-spacing: inherit;
  margin: 0;
}

.widget-head__title {
  flex: 1 1 auto;
  min-width: 0;
}

.widget-head__icon {
  flex-shrink: 0;
  line-height: 1;
}

.widget-actions {
  align-items: center;
  background: #f4f8fc;
  border-bottom: 1px solid rgba(0, 45, 82, 0.08);
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  justify-content: center;
  min-width: 0;
  padding: 8px 16px;
}

.widget-actions__views {
  display: flex;
  flex: 1 1 auto;
  flex-wrap: nowrap;
  align-items: stretch;
  gap: 0.15rem;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
  padding: 0.15rem;
  border: 1px solid rgba(0, 105, 180, 0.16);
  border-radius: 999px;
  background: rgba(229, 244, 251, 0.7);
}

.widget-action-btn {
  align-items: center;
  background: var(--white);
  border: 1px solid rgba(0, 45, 82, 0.14);
  border-radius: 999px;
  color: var(--ink);
  cursor: pointer;
  display: inline-flex;
  flex: 1 1 auto;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 600;
  gap: 6px;
  justify-content: center;
  line-height: 1.2;
  max-width: 100%;
  min-width: min-content;
  padding: 6px 12px;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  white-space: nowrap;
  width: auto;
}

.widget-action-btn__icon {
  flex: 0 0 auto;
  height: 10px;
  position: relative;
  width: 10px;
}

.widget-action-btn__icon::before {
  border-bottom: 2px solid currentColor;
  border-right: 2px solid currentColor;
  content: "";
  display: block;
  height: 6px;
  left: 1px;
  position: absolute;
  top: 0;
  transition: transform 0.2s ease, top 0.2s ease;
  width: 6px;
}

.widget-action-btn[data-bulk-action="expand"] .widget-action-btn__icon::before {
  top: 1px;
  transform: rotate(45deg);
}

.widget-action-btn[data-bulk-action="collapse"] .widget-action-btn__icon::before {
  top: 4px;
  transform: rotate(-135deg);
}

.widget-action-btn__label {
  flex: 0 1 auto;
  min-width: 0;
  text-align: center;
  white-space: nowrap;
}

.widget-action-btn:hover,
.widget-action-btn:focus-visible {
  background: var(--soft);
  border-color: var(--blue-700);
  color: var(--blue-700);
  outline: none;
}

.widget-action-btn--toggle[aria-pressed="true"] {
  background: var(--blue-50, #f0f6ff);
  border-color: color-mix(in srgb, var(--blue-700) 45%, rgba(0, 45, 82, 0.14));
  color: var(--blue-700);
}

.widget-body {
  padding: 16px 20px;
  max-height: calc(15 * 41px + 32px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: #2e9fd4 #e8eef5;
}

.widget-body::-webkit-scrollbar {
  width: 6px;
}

.widget-body::-webkit-scrollbar-track {
  background: #e8eef5;
  border-radius: 3px;
}

.widget-body::-webkit-scrollbar-thumb {
  background: #2e9fd4;
  border-radius: 3px;
}

.widget-body::-webkit-scrollbar-thumb:hover {
  background: #1a6fa8;
}

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

.timeline-list li {
  display: flex;
  gap: 12px;
  padding: 6px 0;
  border-bottom: 1px solid rgba(0, 45, 82, 0.08);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.3;
  color: var(--muted-hero);
  transition: color 0.18s ease;
}

.timeline-list li:last-child {
  border-bottom: none;
}

.timeline-list li:hover {
  color: var(--blue-700);
}

.timeline-list .tl-date {
  flex-shrink: 0;
  padding-top: 2px;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
}

.timeline-list a,
.timeline-list a:link,
.timeline-list a:visited {
  flex: 1 1 auto;
  min-width: 0;
  display: block;
  margin: -2px -6px;
  padding: 2px 6px;
  color: inherit;
  background: transparent;
  border-radius: 10px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.3;
  text-decoration: none !important;
  text-decoration-thickness: 0 !important;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.timeline-list a:hover,
.timeline-list a:focus-visible,
.timeline-list a.tl-active {
  color: var(--blue-700) !important;
  background: var(--soft) !important;
  text-decoration: none !important;
}

.timeline-list a.tl-active {
  font-weight: 700;
}

.timeline-list li:has(a.tl-active) .tl-date {
  color: var(--blue-700);
}

.events-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 44px;
  height: 44px;
  padding: 6px 8px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 8px;
  cursor: pointer;
}

.events-menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--white);
  border-radius: var(--radius-pill);
}

@media (max-width: 1060px) {
  .events-menu-toggle {
    display: inline-flex;
  }

  .sidebar-widget .widget-actions {
    max-height: 0;
    overflow: hidden;
    padding: 0 16px;
    transition: max-height 0.28s ease, padding 0.28s ease;
  }

  .sidebar-widget.events-open .widget-actions {
    max-height: 88px;
    padding: 8px 16px;
  }

  .sidebar-widget .widget-body {
    max-height: 0;
    padding: 0 20px;
    overflow: hidden;
    transition: max-height 0.28s ease, padding 0.28s ease;
  }

  .sidebar-widget.events-open .widget-body {
    max-height: min(70vh, 560px);
    padding: 16px 20px;
    overflow: auto;
  }
}

@media (max-width: 720px) {
  .widget-head {
    padding: 12px 16px;
    font-size: 16px;
  }

  .widget-actions {
    justify-content: center;
    padding: 8px 12px;
  }

  .widget-action-btn {
    flex: 1 1 auto;
    font-size: 12px;
    min-height: 40px;
    min-width: min-content;
    padding: 8px 10px;
    text-align: center;
    white-space: nowrap;
    width: auto;
  }

  .timeline-list li {
    gap: 10px;
    font-size: 14px;
  }

  .timeline-list a {
    min-height: 44px;
    line-height: 1.35;
    padding: 6px 8px;
    margin: -6px -8px;
  }
}

/* Collapsible TOC groups inside sidebar widget (Articles panel pattern) */
.timeline-list > li.toc-group {
  display: block;
  flex-direction: unset;
  gap: unset;
  padding: 0;
}

.toc-group__head {
  align-items: center;
  display: flex;
  gap: 8px;
  min-height: 40px;
  padding: 6px 0;
}

.toc-group[data-toc-cat] > .toc-group__head {
  background: var(--nav-blue-soft, #dff2ff);
  border-radius: 10px;
  padding: 6px 8px;
}

.timeline-list .inventions-toc-cat-row > .tl-date,
.timeline-list .inventions-toc-entry > .tl-date,
.toc-group[data-toc-cat] > .toc-group__head > .tl-date {
  display: none;
}

.timeline-list > li.inventions-toc-entry,
.timeline-list > li.inventions-toc-ref-row {
  padding-inline-start: var(--nested-story-indent, 1rem);
}

.toc-group__head .tl-date {
  flex-shrink: 0;
  padding-top: 2px;
}

.toc-group__head a,
.toc-group__label {
  flex: 1 1 auto;
  min-width: 0;
}

.toc-group__label {
  display: block;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.3;
}

.toc-group__count {
  background: var(--blue-50, #f0f6ff);
  border-radius: 999px;
  color: var(--blue-700);
  flex: 0 0 auto;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
}

.toc-group__toggle {
  align-items: center;
  background: transparent;
  border: 1px solid rgba(0, 45, 82, 0.14);
  border-radius: 8px;
  cursor: pointer;
  display: inline-flex;
  flex: 0 0 auto;
  height: 32px;
  justify-content: center;
  padding: 0;
  transition: background-color 0.15s ease, border-color 0.15s ease;
  width: 32px;
}

.toc-group__toggle:hover,
.toc-group__toggle:focus-visible {
  background: var(--soft);
  border-color: var(--blue-700);
  outline: none;
}

.toc-group__chevron {
  border-bottom: 2px solid var(--muted);
  border-right: 2px solid var(--muted);
  height: 8px;
  margin-top: -2px;
  transform: rotate(45deg);
  transition: transform 0.28s ease, margin-top 0.28s ease;
  width: 8px;
}

.toc-group.events-open .toc-group__chevron {
  margin-top: 2px;
  transform: rotate(-135deg);
}

.toc-group__body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.28s ease;
}

.toc-group.events-open .toc-group__body {
  max-height: var(--toc-group-expanded-max, 1600px);
}

.toc-group__list {
  list-style: none;
  margin: 0;
  /* Extra 6px offsets .story-nav link negative margin so the visual inset stays 1rem. */
  padding: 0 0 6px calc(var(--nested-story-indent, 1rem) + 6px);
}

.toc-group__list > li {
  border-bottom: 1px solid rgba(0, 45, 82, 0.06);
  display: flex;
  font-family: var(--font-sans);
  font-size: 14px;
  gap: 10px;
  line-height: 1.3;
  padding: 5px 0;
}

.toc-group__list > li.inventions-toc-entry,
.toc-group__list > li.research-toc-entry {
  font-weight: 400;
}

.toc-group__list > li.inventions-toc-ref-row {
  font-weight: 400;
}

.toc-group__list > li.inventions-toc-entry a,
.toc-group__list > li.research-toc-entry a,
.toc-group__list > li.inventions-toc-ref-row a {
  font-weight: 500;
}

.toc-group__list > li:last-child {
  border-bottom: none;
}

.toc-group.toc-active .toc-group__head .tl-date,
.toc-group.toc-active .toc-group__head a {
  color: var(--blue-700);
}

.toc-group.is-hidden {
  display: none !important;
}

.charter-sidebar .sidebar-widget .widget-actions[hidden],
.charter-sidebar .sidebar-widget .widget-actions.is-hidden {
  display: none !important;
}

body.catalog-expand-collapse-on .charter-sidebar .sidebar-widget .widget-actions:not([hidden]):not(.is-hidden) {
  display: flex !important;
  flex-wrap: nowrap !important;
  justify-content: center !important;
  max-height: none !important;
  overflow: visible !important;
  padding: 8px 16px !important;
  border-bottom-width: 1px !important;
}

/* Compact panel variant: header + actions only (e.g. main-column Articles controls) */
.sidebar-widget.sidebar-widget--controls-only .widget-actions {
  border-bottom: none;
}

.sidebar-widget.sidebar-widget--controls-only {
  margin-bottom: 0;
}

@media (max-width: 720px) {
  .toc-group__head {
    min-height: 44px;
  }

  .toc-group__toggle {
    height: 36px;
    width: 36px;
  }
}