/* Adapted from https://stackoverflow.com/questions/899148/html-select-option-separator */

optgroup + optgroup {
    border-top: 1px solid black
}

optgroup { padding-bottom: 8px; }
optgroup:not(:first-child) {
    padding-top: 8px; border-top: solid 1px #666;
}

.ai-area {
    color: #377eb8
}

.systems-area {
    color: #ff7f00
}

.theory-area {
    color: #4daf4a
}

.interdisciplinary-area {
    color: #984ea3
}

/* Hide left area selection panel on mobile only */
@media (max-width: 767px) {
  #area-selection-panel {
    display: none !important;
  }

  /* Center the ranking window content on mobile */
  #ranking-window {
    text-align: center;
  }

  #ranking-window #success {
    display: inline-block;
    text-align: left;
    max-width: 900px;
    width: 100%;
  }
}

.overlay {
  position: fixed;
  display: block;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0,0,0,0.5);
  z-index: 10000;
  cursor: pointer;
}

.centerscreen {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  min-height: 100vh;
}

.overlaytext {
  font-size: 20vw;
  color: white;
}

.rank-controls-sticky {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: #fff;
  margin-left: -15px;
  margin-right: -15px;
  padding-left: 15px;
  padding-right: 15px;
}

/* Flexbox layout for rank controls */
.rank-controls-flex {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.rank-controls-main {
  flex: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  gap: 8px;
}

.rank-controls-sponsor {
  flex-shrink: 0;
}

.btn-sponsor {
  background: #337ab7;
  color: white;
  border: none;
  padding: 6px 16px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 2px 4px rgba(51, 122, 183, 0.3);
}

.btn-sponsor:hover {
  background: #286090;
  box-shadow: 0 4px 8px rgba(51, 122, 183, 0.4);
  transform: translateY(-1px);
}

.btn-sponsor:active {
  transform: translateY(0);
  box-shadow: 0 2px 4px rgba(51, 122, 183, 0.3);
}

/* ============================================
   Area Selection Indicators
   ============================================ */

.area-indicators {
  display: inline-flex;
  gap: 4px;
  align-items: center;
}

.area-indicator {
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s ease;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.area-indicator.ai-indicator {
  background-color: #377eb8;
  color: white;
}

.area-indicator.systems-indicator {
  background-color: #ff7f00;
  color: white;
}

.area-indicator.theory-indicator {
  background-color: #4daf4a;
  color: white;
}

.area-indicator.interdisciplinary-indicator {
  background-color: #984ea3;
  color: white;
}

/* Selection states via opacity */
.area-indicator.selection-none {
  opacity: 0.25;
}

.area-indicator.selection-partial {
  opacity: 0.6;
}

.area-indicator.selection-all {
  opacity: 1.0;
}

.area-indicator:hover {
  filter: brightness(1.1);
}

.area-indicator.active {
  box-shadow: 0 0 0 2px rgba(0,0,0,0.2);
}

/* Area Dropdown Panels */
.area-indicators {
  position: relative;
}

.area-dropdown-panel {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 8px;
  background: white;
  border: 1px solid #ddd;
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  z-index: 1000;
  min-width: 200px;
  max-height: 300px;
  overflow-y: auto;
}

.area-dropdown-panel.open {
  display: block;
}

.area-dropdown-content {
  padding: 8px 0;
}

.area-dropdown-item {
  padding: 6px 12px;
}

.area-dropdown-item:hover {
  background: #f5f5f5;
}

.area-dropdown-item label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  margin: 0;
  font-size: 13px;
  white-space: nowrap;
}

.area-dropdown-item input[type="checkbox"] {
  width: 16px;
  height: 16px;
  cursor: pointer;
}

/* Parent area rows */
.area-parent-row {
  display: flex;
  align-items: center;
  gap: 4px;
}

.area-expand-icon {
  cursor: pointer;
  font-size: 10px;
  color: #666;
  width: 16px;
  text-align: center;
  transition: transform 0.2s ease;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.area-expand-icon.expanded {
  transform: rotate(90deg);
}

.area-expand-spacer {
  width: 16px;
}

/* Child conference list */
.area-children {
  display: none;
  margin-left: 20px;
  border-left: 2px solid #eee;
  padding-left: 8px;
}

.area-children.expanded {
  display: block;
}

.area-child {
  padding: 4px 8px;
}

.area-child-divider {
  height: 1px;
  background: #ddd;
  margin: 6px 0;
}

.area-dropdown-divider {
  height: 1px;
  background: #ddd;
  margin: 4px 12px;
}

.area-all-toggle {
  font-weight: 500;
}

.area-child.next-tier {
  opacity: 0.7;
}

/* Responsive positioning */
@media (max-width: 768px) {
  .area-dropdown-panel {
    position: fixed;
    left: 10px;
    right: 10px;
    top: 50%;
    bottom: auto;
    transform: translateY(-50%);
    max-width: none;
    max-height: 60vh;
    -webkit-overflow-scrolling: touch;
  }

  /* Larger touch targets for mobile/tablet */
  .area-dropdown-item {
    padding: 10px 12px;
  }

  .area-dropdown-item label {
    font-size: 15px;
    min-height: 24px;
  }

  .area-dropdown-item input[type="checkbox"] {
    width: 20px;
    height: 20px;
  }

  .area-expand-icon {
    font-size: 14px;
    width: 24px;
    padding: 4px;
  }

  .area-child {
    padding: 8px 8px;
  }
}

/* iOS Safari specific fixes */
@supports (-webkit-touch-callout: none) {
  .area-dropdown-panel {
    -webkit-overflow-scrolling: touch;
  }
}

@media (max-width: 576px) {
  .rank-controls-sponsor {
    display: none;
  }
}

/* ============================================
   Area Section Toggle Buttons
   ============================================ */

.area-toggle-btn {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s ease, filter 0.2s ease;
  user-select: none;
  color: white;
  vertical-align: middle;
}

.area-toggle-btn.ai-toggle {
  background-color: #377eb8;
}

.area-toggle-btn.systems-toggle {
  background-color: #ff7f00;
}

.area-toggle-btn.theory-toggle {
  background-color: #4daf4a;
}

.area-toggle-btn.interdisciplinary-toggle {
  background-color: #984ea3;
}

/* Selection states via opacity */
.area-toggle-btn.selection-none {
  opacity: 0.3;
}

.area-toggle-btn.selection-partial {
  opacity: 0.65;
}

.area-toggle-btn.selection-all {
  opacity: 1.0;
}

.area-toggle-btn:hover {
  filter: brightness(1.15);
}

@media (max-width: 992px) {
  .area-toggle-btn {
    margin-top: 8px;
    margin-bottom: 4px;
  }
}

/* ============================================
   Custom Region Dropdown with Flags
   ============================================ */

.custom-region-dropdown {
  position: relative;
  display: inline-block;
  min-width: 140px;
  vertical-align: middle;
}

.region-selected {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: white;
  border: 1px solid #ccc;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
}

.region-selected:hover {
  border-color: #337ab7;
}

.region-flag {
  width: 16px;
  height: auto;
  flex-shrink: 0;
}

.region-arrow {
  margin-left: auto;
  font-size: 10px;
  color: #666;
}

.region-options {
  display: none !important;
  visibility: hidden;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  min-width: 200px;
  max-height: 300px;
  overflow-y: auto;
  background: white;
  border: 1px solid #ccc;
  border-top: none;
  border-radius: 0 0 4px 4px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.15);
  z-index: 1000;
}

.region-options.open {
  display: block !important;
  visibility: visible;
}

.region-option-group {
  padding: 4px 8px;
  font-size: 11px;
  font-weight: 600;
  color: #666;
  background: #f5f5f5;
  border-top: 1px solid #eee;
}

.region-option-group:first-child {
  border-top: none;
}

.region-option {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 13px;
}

.region-option:hover {
  background: #e3f2fd;
}

.region-option.selected {
  background: #d9edf7;
}

.region-option img {
  width: 16px;
  height: auto;
}

.region-option-noicon {
  padding-left: 36px;
}

/* Globe images for multi-country regions */
.region-globe-img {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* ============================================
   Custom Chart Type Dropdown
   ============================================ */

.custom-chart-dropdown {
  position: relative;
  display: inline-block;
  vertical-align: middle;
}

.chart-selected {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  background: white;
  border: 1px solid #ccc;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
}

.chart-selected:hover {
  border-color: #337ab7;
}

.chart-selected .chart-icon {
  width: 12px;
  height: auto;
}

.chart-arrow {
  font-size: 10px;
  color: #666;
  margin-left: 2px;
}

.chart-options {
  display: none !important;
  visibility: hidden;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 100%;
  background: white;
  border: 1px solid #ccc;
  border-top: none;
  border-radius: 0 0 4px 4px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.15);
  z-index: 1000;
}

.chart-options.open {
  display: flex !important;
  visibility: visible;
  flex-direction: column;
}

.chart-option {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  cursor: pointer;
  font-size: 13px;
  white-space: nowrap;
}

.chart-option:hover {
  background: #e3f2fd;
}

.chart-option.selected {
  background: #d9edf7;
}

.chart-option img {
  width: 12px;
  height: auto;
}

.rank-controls-panel {
  margin-top: 0;
  margin-bottom: 20px;
  border-top: none;
  border-radius: 0 0 4px 4px;
}

.rank-controls-panel .panel-heading {
  background-color: #d9edf7;
  box-shadow: none;
  border-top: none;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
  border-bottom-left-radius: 4px;
  border-bottom-right-radius: 4px;
}

.intro-panel {
  margin-bottom: 0;
  border-bottom: none;
  border-radius: 4px 4px 0 0;
}

.intro-panel .panel-heading {
  border-bottom: none;
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
  border-top-left-radius: 4px;
  border-top-right-radius: 4px;
  padding-bottom: 5px;
}

/* ============================================
   Responsive institution list height
   ============================================ */

/* Desktop: make institution list match areas list height */
@media (min-width: 768px) {
  /* Use flexbox to equalize column heights */
  .row.switch-xs.row-centered {
    display: flex;
    align-items: stretch;
  }

  .row.switch-xs.row-centered > [class*='col-'] {
    display: flex;
    flex-direction: column;
  }

  /* Institution column content should fill height */
  #success {
    flex: 1;
    display: flex;
    flex-direction: column;
  }

  #success .table-responsive {
    flex: 1;
    max-height: 800px;
    overflow-y: auto;
  }

  /* Sticky table header inside scrolling container */
  #success table.table-fit {
    border-collapse: separate;
    border-spacing: 0;
  }

  #success table.table-fit > thead {
    position: sticky;
    top: 0;
    z-index: 10;
  }

  #success table.table-fit > thead > tr > th {
    background-color: #fff;
    border-bottom: 2px solid #ddd;
    padding-top: 8px;
    padding-bottom: 8px;
  }
}

/* ============================================
   Ranking table zebra striping and hover
   ============================================ */

/* Rank number column - fixed width, right aligned */
.rank-cell {
  width: 2.5em;
  min-width: 2.5em;
  text-align: right;
  padding-right: 8px !important;
  font-variant-numeric: tabular-nums;
}

/* Institution rankings: zebra stripe every other institution */
/* Table has 3 rows per institution: data, chart, faculty */
#success table.table-fit > tbody > tr:nth-child(6n+1) > td {
  background-color: #f5f5f5;
}

/* Institution hover */
#success table.table-fit > tbody > tr:nth-child(3n+1):hover > td {
  background-color: #e3f2fd;
}

/* Add vertical padding to institution data rows for breathing room */
#success table.table-fit > tbody > tr:nth-child(3n+1) > td {
  padding-top: 4px;
  padding-bottom: 4px;
}

/* Collapse empty chart/faculty rows */
#success table.table-fit > tbody > tr:nth-child(3n+2) > td,
#success table.table-fit > tbody > tr:nth-child(3n) > td {
  padding: 0 !important;
  line-height: 0 !important;
  font-size: 0 !important;
}

/* ============================================
   Faculty listings zebra striping and hover
   ============================================ */

/* Faculty zebra stripe - stripe faculty 1, 3, 5... (rows 1, 5, 9...) */
#success div.table > table tbody tr:nth-child(4n+1) td {
  background-color: #f5f5f5;
}

/* Faculty hover */
#success div.table > table tbody tr:hover td {
  background-color: #e3f2fd;
}

/* Collapse empty chart rows in faculty tables */
#success div.table > table tbody tr:nth-child(even) td {
  padding: 0 !important;
  line-height: 0 !important;
  font-size: 0 !important;
}

/* ============================================
   Year Range Slider
   ============================================ */

.year-slider-container {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex-wrap: nowrap;
}

.year-slider-label {
  white-space: nowrap;
  color: #333;
}

.year-display {
  font-weight: bold;
  font-size: 1.1em;
  min-width: 48px;
  text-align: center;
  color: #337ab7;
  background-color: #d9edf7;
  padding: 2px 6px;
  border-radius: 3px;
  border: 1px solid #bce8f1;
  cursor: text;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.year-display:hover {
  border-color: #337ab7;
}

.year-display:focus {
  outline: none;
  border-color: #337ab7;
  box-shadow: 0 0 0 2px rgba(51, 122, 183, 0.25);
  background-color: #fff;
}

.year-slider {
  width: 100px;
  height: 8px;
  margin: 0 8px;
}

/* Year range display wrapper */
.year-range-display {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-right: 8px;
}

/* noUiSlider customization */
.year-slider .noUi-connect {
  background: #337ab7;
}

.year-slider .noUi-handle {
  height: 17px !important;
  width: 5px !important;
  min-width: 0 !important;
  top: 0px !important;
  right: -2px !important;
  border-radius: 0 !important;
  border: none !important;
  box-shadow: none !important;
  background: #000 !important;
  cursor: ew-resize;
}

.year-slider .noUi-handle:hover {
  background: #333 !important;
}

.year-slider .noUi-handle:before,
.year-slider .noUi-handle:after {
  display: none;
}

.year-slider .noUi-handle:focus {
  outline: none;
  box-shadow: none;
}

/* Responsive adjustments */
@media (max-width: 992px) {
  .year-slider-container {
    display: inline-flex;
    flex-wrap: nowrap;
    align-items: center;
    gap: 6px;
  }

  .year-slider {
    width: 100px;
    min-width: 80px;
    max-width: 100px;
    margin: 0;
  }

  .year-slider-label {
    display: none;
  }

  .year-display {
    flex-shrink: 0;
    min-width: 42px;
    font-size: 0.95em;
    padding: 2px 4px;
  }
}

@media (max-width: 576px) {
  .year-slider-container {
    gap: 4px;
  }

  .year-slider {
    width: 80px;
    min-width: 60px;
    max-width: 80px;
  }

  .year-display {
    min-width: 38px;
    font-size: 0.85em;
    padding: 1px 3px;
  }
}

/* ============================================
   Footer Styles
   ============================================ */

.page-footer {
  margin-top: 2em;
  padding: 1em 0;
  border-top: 1px solid #ddd;
  text-align: center;
}

.page-footer p {
  margin-bottom: 0.5em;
}

/* ============================================
   Sponsors Avatars
   ============================================ */

.sponsors-avatars {
  margin: 0.75em 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 5px;
}

.sponsors-avatars a {
  display: inline-block;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.sponsors-avatars a:hover {
  transform: scale(1.15);
}

.sponsors-avatars img {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid #ddd;
  transition: border-color 0.2s ease;
}

.sponsors-avatars a:hover img {
  border-color: #337ab7;
}

/* ============================================
   Skeleton Loading States
   ============================================ */

.skeleton-loading {
  padding: 20px;
}

.skeleton-row {
  display: flex;
  align-items: center;
  padding: 12px 10px;
  border-bottom: 1px solid #f0f0f0;
}

.skeleton-row:nth-child(odd) {
  background: #fafafa;
}

.skeleton-rank {
  width: 30px;
  height: 20px;
  background: linear-gradient(90deg, #e0e0e0 25%, #f0f0f0 50%, #e0e0e0 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
  border-radius: 3px;
  margin-right: 15px;
}

.skeleton-name {
  flex: 1;
  height: 20px;
  background: linear-gradient(90deg, #e0e0e0 25%, #f0f0f0 50%, #e0e0e0 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
  border-radius: 3px;
  max-width: 250px;
}

.skeleton-score {
  width: 50px;
  height: 20px;
  background: linear-gradient(90deg, #e0e0e0 25%, #f0f0f0 50%, #e0e0e0 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
  border-radius: 3px;
  margin-left: 20px;
}

@keyframes skeleton-shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.skeleton-header {
  display: flex;
  padding: 10px;
  border-bottom: 2px solid #ddd;
  margin-bottom: 5px;
}

.skeleton-header-item {
  height: 16px;
  background: #d0d0d0;
  border-radius: 3px;
}

.skeleton-header-item:first-child {
  width: 30px;
  margin-right: 15px;
}

.skeleton-header-item:nth-child(2) {
  flex: 1;
  max-width: 120px;
}

.skeleton-header-item:last-child {
  width: 50px;
  margin-left: 20px;
}

/* ============================================
   Mobile Responsive Improvements
   ============================================ */

/* Touch-friendly year slider - only for touch devices */
@media (pointer: coarse) {
  .year-slider .noUi-handle {
    width: 28px !important;
    height: 28px !important;
    right: -14px !important;
    top: -10px !important;
    border-radius: 50% !important;
    background: #fff !important;
    border: 2px solid #333 !important;
    box-sizing: border-box !important;
    cursor: pointer;
  }

  /* Hide the default handle lines */
  .year-slider .noUi-handle:before,
  .year-slider .noUi-handle:after {
    display: none !important;
  }

  .year-slider .noUi-touch-area {
    width: 44px;
    height: 44px;
    position: absolute;
    top: -8px;
    left: -8px;
  }

  .year-slider-container {
    padding: 10px 5px;
  }

  .year-slider {
    margin: 0 15px;
  }
}