/*=====================================
  IMAGE VERSION SWITCHER STYLES
  For selecting between different image versions/sources

  IEEE Color Palette:
  - Navy:   #2C3E50
  - Teal:   #16A085
  - Orange: #E67E22
  - Gray:   #7F8C8D
=====================================*/

/* ===== CSS CUSTOM PROPERTIES ===== */
:root {
  /* IEEE Color Palette */
  --vs-navy: #2C3E50;
  --vs-teal: #16A085;
  --vs-orange: #E67E22;
  --vs-gray: #7F8C8D;

  /* Derived colors */
  --vs-navy-light: #3D5166;
  --vs-teal-light: #1ABC9C;
  --vs-orange-light: #F39C12;
  --vs-gray-light: #95A5A6;

  /* UI colors */
  --vs-bg: #FFFFFF;
  --vs-bg-hover: #F8F9FA;
  --vs-border: #E0E0E0;
  --vs-text: #333333;
  --vs-text-muted: #666666;
  --vs-shadow: rgba(0, 0, 0, 0.15);
  --vs-shadow-lg: rgba(0, 0, 0, 0.25);

  /* Animation timing */
  --vs-transition-fast: 0.15s ease;
  --vs-transition: 0.25s ease;
  --vs-transition-slow: 0.35s ease;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --vs-bg: #1E1E1E;
    --vs-bg-hover: #2D2D2D;
    --vs-border: #404040;
    --vs-text: #E0E0E0;
    --vs-text-muted: #A0A0A0;
    --vs-shadow: rgba(0, 0, 0, 0.4);
    --vs-shadow-lg: rgba(0, 0, 0, 0.5);
  }
}

/* ===== VERSION SWITCHER BUTTON/ICON ===== */
.version-switcher {
  position: relative;
  display: inline-block;
}

.version-switcher-trigger {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 10;

  /* Button styling */
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;

  min-width: 32px;
  height: 32px;
  padding: 4px 8px;

  background: var(--vs-navy);
  color: #FFFFFF;
  border: none;
  border-radius: 6px;

  font-size: 14px;
  font-weight: 500;
  cursor: pointer;

  /* Initially hidden, shown on hover */
  opacity: 0;
  transform: scale(0.9);
  transition: opacity var(--vs-transition),
              transform var(--vs-transition),
              background var(--vs-transition-fast);

  box-shadow: 0 2px 8px var(--vs-shadow);
}

/* Show button on figure hover */
.version-switcher:hover .version-switcher-trigger,
figure:hover .version-switcher-trigger,
.quarto-figure:hover .version-switcher-trigger,
[id^="fig-"]:hover .version-switcher-trigger,
.version-switcher:hover .version-switcher-btn,
figure:hover .version-switcher-btn,
.quarto-figure:hover .version-switcher-btn,
[id^="fig-"]:hover .version-switcher-btn {
  opacity: 1;
  transform: scale(1);
}

/* Alias for version-switcher-btn (used by iotclass-versions.js) */
.version-switcher-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  min-width: 32px;
  height: 32px;
  padding: 4px 8px;
  background: var(--vs-navy);
  color: #FFFFFF;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  opacity: 0;
  transform: scale(0.9);
  transition: opacity var(--vs-transition),
              transform var(--vs-transition),
              background var(--vs-transition-fast);
  box-shadow: 0 2px 8px var(--vs-shadow);
}

.version-switcher-btn:hover {
  background: var(--vs-teal);
  transform: scale(1.05);
  box-shadow: 0 4px 12px var(--vs-shadow-lg);
}

.version-switcher-btn:active {
  transform: scale(0.98);
}

.version-switcher-btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(22, 160, 133, 0.4),
              0 2px 8px var(--vs-shadow);
}

.version-switcher-btn .version-icon {
  font-size: 14px;
}

.version-switcher-btn .version-count {
  font-size: 11px;
  background: var(--vs-teal);
  padding: 1px 5px;
  border-radius: 10px;
}

/* Button hover state */
.version-switcher-trigger:hover {
  background: var(--vs-teal);
  transform: scale(1.05);
  box-shadow: 0 4px 12px var(--vs-shadow-lg);
}

/* Button active/pressed state */
.version-switcher-trigger:active {
  transform: scale(0.98);
}

/* Button focus state for accessibility */
.version-switcher-trigger:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(22, 160, 133, 0.4),
              0 2px 8px var(--vs-shadow);
}

/* Version switcher icon (layers/stack icon using CSS) */
.version-switcher-icon {
  display: inline-flex;
  flex-direction: column;
  gap: 2px;
  width: 14px;
  height: 12px;
}

.version-switcher-icon::before,
.version-switcher-icon::after {
  content: '';
  display: block;
  height: 3px;
  background: currentColor;
  border-radius: 1px;
}

.version-switcher-icon::before {
  width: 100%;
}

.version-switcher-icon::after {
  width: 80%;
  margin-left: auto;
  opacity: 0.7;
}

/* Alternative: Unicode icon */
.version-switcher-trigger[data-icon="layers"]::before {
  content: "\229E"; /* Squared plus */
  font-size: 16px;
  line-height: 1;
}

.version-switcher-trigger[data-icon="gear"]::before {
  content: "\2699"; /* Gear */
  font-size: 16px;
  line-height: 1;
}

/* Version count badge */
.version-switcher-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  min-width: 16px;
  height: 16px;
  padding: 0 4px;

  background: rgba(255, 255, 255, 0.25);
  border-radius: 8px;

  font-size: 10px;
  font-weight: 700;
  line-height: 1;
}

/* ===== VERSION DROPDOWN PANEL ===== */
.version-switcher-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  z-index: 1000;

  min-width: 280px;
  max-width: 380px;
  max-height: 400px;

  margin-top: 8px;

  background: var(--vs-bg);
  border: 1px solid var(--vs-border);
  border-radius: 8px;

  box-shadow: 0 8px 24px var(--vs-shadow-lg);

  /* Hidden by default */
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--vs-transition),
              visibility var(--vs-transition),
              transform var(--vs-transition);

  overflow: hidden;
}

/* Show dropdown when active */
.version-switcher.is-open .version-switcher-dropdown,
.version-switcher-dropdown.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Dropdown header */
.version-switcher-header {
  display: flex;
  align-items: center;
  justify-content: space-between;

  padding: 12px 16px;

  background: var(--vs-navy);
  color: #FFFFFF;

  font-weight: 600;
  font-size: 14px;
}

.version-switcher-header-title {
  display: flex;
  align-items: center;
  gap: 8px;
}

.version-switcher-close {
  display: flex;
  align-items: center;
  justify-content: center;

  width: 24px;
  height: 24px;

  background: transparent;
  border: none;
  border-radius: 4px;

  color: #FFFFFF;
  font-size: 18px;
  line-height: 1;
  cursor: pointer;

  opacity: 0.7;
  transition: opacity var(--vs-transition-fast),
              background var(--vs-transition-fast);
}

.version-switcher-close:hover {
  opacity: 1;
  background: rgba(255, 255, 255, 0.15);
}

/* Dropdown body/content */
.version-switcher-body {
  max-height: 320px;
  padding: 12px;
  overflow-y: auto;
}

/* Scrollbar styling for dropdown */
.version-switcher-body::-webkit-scrollbar {
  width: 6px;
}

.version-switcher-body::-webkit-scrollbar-track {
  background: transparent;
}

.version-switcher-body::-webkit-scrollbar-thumb {
  background: var(--vs-gray-light);
  border-radius: 3px;
}

.version-switcher-body::-webkit-scrollbar-thumb:hover {
  background: var(--vs-gray);
}

/* ===== VERSION LIST ===== */
.version-switcher-list {
  display: flex;
  flex-direction: column;
  gap: 6px;

  list-style: none;
  margin: 0;
  padding: 0;
}

/* Version item */
.version-switcher-item {
  display: flex;
  align-items: center;
  gap: 10px;

  padding: 10px 12px;

  background: var(--vs-bg);
  border: 1px solid var(--vs-border);
  border-radius: 6px;

  cursor: pointer;
  transition: background var(--vs-transition-fast),
              border-color var(--vs-transition-fast),
              transform var(--vs-transition-fast);
}

.version-switcher-item:hover {
  background: var(--vs-bg-hover);
  border-color: var(--vs-gray-light);
}

/* Selected/current version */
.version-switcher-item.is-current,
.version-switcher-item.is-selected {
  background: #E8F6F3;
  border-color: var(--vs-teal);
}

.version-switcher-item.is-current:hover,
.version-switcher-item.is-selected:hover {
  background: #D4EDE8;
}

/* Radio input (hidden visually but accessible) */
.version-switcher-item input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

/* Custom radio indicator */
.version-switcher-radio {
  display: flex;
  align-items: center;
  justify-content: center;

  width: 18px;
  height: 18px;
  flex-shrink: 0;

  background: #FFFFFF;
  border: 2px solid var(--vs-border);
  border-radius: 50%;

  transition: border-color var(--vs-transition-fast),
              background var(--vs-transition-fast);
}

.version-switcher-item.is-current .version-switcher-radio,
.version-switcher-item.is-selected .version-switcher-radio {
  border-color: var(--vs-teal);
  background: var(--vs-teal);
}

.version-switcher-radio::after {
  content: '';
  width: 6px;
  height: 6px;
  background: #FFFFFF;
  border-radius: 50%;
  opacity: 0;
  transform: scale(0);
  transition: opacity var(--vs-transition-fast),
              transform var(--vs-transition-fast);
}

.version-switcher-item.is-current .version-switcher-radio::after,
.version-switcher-item.is-selected .version-switcher-radio::after {
  opacity: 1;
  transform: scale(1);
}

/* Version item content */
.version-switcher-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.version-switcher-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--vs-text);

  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.version-switcher-source {
  font-size: 11px;
  color: var(--vs-text-muted);

  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ===== VERSION TYPE BADGES ===== */
.version-switcher-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;

  padding: 3px 8px;

  border-radius: 4px;

  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.02em;

  white-space: nowrap;
  flex-shrink: 0;
}

/* Original image badge - Navy */
.version-switcher-badge--original,
.version-switcher-badge[data-type="original"] {
  background: rgba(44, 62, 80, 0.15);
  color: var(--vs-navy);
}

/* Mermaid SVG badge - Teal */
.version-switcher-badge--mermaid,
.version-switcher-badge[data-type="mermaid"] {
  background: rgba(22, 160, 133, 0.15);
  color: var(--vs-teal);
}

/* DrawIO badge - Orange */
.version-switcher-badge--drawio,
.version-switcher-badge[data-type="drawio"] {
  background: rgba(230, 126, 34, 0.15);
  color: var(--vs-orange);
}

/* Academic source badge - Gray */
.version-switcher-badge--academic,
.version-switcher-badge[data-type="academic"] {
  background: rgba(127, 140, 141, 0.15);
  color: var(--vs-gray);
}

/* SVG badge */
.version-switcher-badge--svg,
.version-switcher-badge[data-type="svg"] {
  background: rgba(155, 89, 182, 0.15);
  color: #8E44AD;
}

/* PNG/JPG badge */
.version-switcher-badge--raster,
.version-switcher-badge[data-type="png"],
.version-switcher-badge[data-type="jpg"],
.version-switcher-badge[data-type="jpeg"] {
  background: rgba(52, 152, 219, 0.15);
  color: #2980B9;
}

/* Badge with icon */
.version-switcher-badge-icon {
  font-size: 11px;
  line-height: 1;
}

/* ===== VERSION SECTION GROUPS ===== */
.version-switcher-section {
  margin-bottom: 16px;
}

.version-switcher-section:last-child {
  margin-bottom: 0;
}

.version-switcher-section-title {
  display: flex;
  align-items: center;
  gap: 8px;

  margin: 0 0 8px 0;
  padding-bottom: 6px;

  color: var(--vs-text);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;

  border-bottom: 1px solid var(--vs-border);
}

/* ===== DROPDOWN FOOTER/ACTIONS ===== */
.version-switcher-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;

  padding: 12px 16px;

  border-top: 1px solid var(--vs-border);
  background: var(--vs-bg-hover);
}

.version-switcher-apply {
  padding: 8px 16px;

  background: var(--vs-teal);
  border: none;
  border-radius: 6px;

  color: #FFFFFF;
  font-size: 13px;
  font-weight: 600;

  cursor: pointer;
  transition: background var(--vs-transition-fast),
              transform var(--vs-transition-fast);
}

.version-switcher-apply:hover {
  background: var(--vs-teal-light);
}

.version-switcher-apply:active {
  transform: scale(0.98);
}

.version-switcher-apply:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(22, 160, 133, 0.3);
}

/* ===== CURRENT VERSION INDICATOR ===== */
.version-switcher-current {
  display: flex;
  align-items: center;
  gap: 6px;

  padding: 6px 10px;

  background: rgba(22, 160, 133, 0.1);
  border-radius: 4px;

  font-size: 11px;
  color: var(--vs-teal);
}

.version-switcher-current-label {
  font-weight: 500;
}

.version-switcher-current-check {
  font-size: 14px;
}

/* ===== BACKDROP FOR MODAL BEHAVIOR ===== */
.version-switcher-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;

  z-index: 999;

  background: rgba(0, 0, 0, 0.3);

  opacity: 0;
  visibility: hidden;
  transition: opacity var(--vs-transition),
              visibility var(--vs-transition);
}

.version-switcher-backdrop.is-visible {
  opacity: 1;
  visibility: visible;
}

/* ===== PREVIEW THUMBNAIL ===== */
.version-switcher-preview {
  width: 48px;
  height: 36px;
  flex-shrink: 0;

  border-radius: 4px;
  overflow: hidden;

  background: var(--vs-bg-hover);
  border: 1px solid var(--vs-border);
}

.version-switcher-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.version-switcher-preview--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;

  color: var(--vs-gray-light);
  font-size: 16px;
}

/* ===== RESPONSIVE DESIGN ===== */

/* Tablet and below */
@media (max-width: 768px) {
  .version-switcher-trigger {
    min-width: 40px;
    height: 40px;
    padding: 8px 10px;

    /* Always visible on mobile for better discoverability */
    opacity: 0.85;
    transform: scale(1);
  }

  .version-switcher-dropdown {
    position: fixed;
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;

    min-width: 100%;
    max-width: 100%;
    max-height: 70vh;

    margin-top: 0;
    border-radius: 16px 16px 0 0;

    transform: translateY(100%);
  }

  .version-switcher.is-open .version-switcher-dropdown,
  .version-switcher-dropdown.is-visible {
    transform: translateY(0);
  }

  .version-switcher-header {
    padding: 16px 20px;
    border-radius: 16px 16px 0 0;
  }

  .version-switcher-body {
    padding: 16px;
    max-height: calc(70vh - 140px);
  }

  .version-switcher-item {
    padding: 14px 16px;

    /* Touch-friendly target size (44px minimum) */
    min-height: 54px;
  }

  .version-switcher-footer {
    padding: 16px 20px;
  }

  .version-switcher-apply {
    flex: 1;
    padding: 12px 20px;
    font-size: 14px;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  .version-switcher-trigger {
    top: 4px;
    right: 4px;
    min-width: 36px;
    height: 36px;
  }

  .version-switcher-count {
    display: none;
  }

  .version-switcher-dropdown {
    max-height: 80vh;
  }

  .version-switcher-item {
    gap: 8px;
  }

  .version-switcher-preview {
    width: 40px;
    height: 30px;
  }

  .version-switcher-badge {
    padding: 2px 6px;
    font-size: 9px;
  }
}

/* ===== INTEGRATION WITH QUARTO FIGURES ===== */

/* Ensure figure container can hold positioned elements */
figure.version-switcher,
.quarto-figure.version-switcher,
[id^="fig-"].version-switcher {
  position: relative;
}

/* Style adjustments for figures with version switcher */
figure.version-switcher img,
.quarto-figure.version-switcher img {
  transition: opacity var(--vs-transition);
}

figure.version-switcher.is-loading img,
.quarto-figure.version-switcher.is-loading img {
  opacity: 0.6;
}

/* Loading spinner overlay */
.version-switcher-loading {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);

  display: none;

  width: 32px;
  height: 32px;

  border: 3px solid var(--vs-border);
  border-top-color: var(--vs-teal);
  border-radius: 50%;

  animation: vs-spin 0.8s linear infinite;
}

figure.version-switcher.is-loading .version-switcher-loading {
  display: block;
}

@keyframes vs-spin {
  to {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

/* ===== PRINT STYLES ===== */
@media print {
  .version-switcher-trigger,
  .version-switcher-dropdown,
  .version-switcher-backdrop {
    display: none !important;
  }
}

/* ===== ANIMATION KEYFRAMES ===== */
@keyframes vs-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes vs-slide-up {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== UTILITY CLASSES ===== */
.version-switcher--compact .version-switcher-trigger {
  min-width: 28px;
  height: 28px;
  padding: 4px 6px;
  font-size: 12px;
}

.version-switcher--compact .version-switcher-count {
  min-width: 14px;
  height: 14px;
  font-size: 9px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .version-switcher-trigger {
    border: 2px solid #FFFFFF;
  }

  .version-switcher-item {
    border-width: 2px;
  }

  .version-switcher-item.is-current,
  .version-switcher-item.is-selected {
    border-width: 3px;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  .version-switcher-trigger,
  .version-switcher-dropdown,
  .version-switcher-item,
  .version-switcher-backdrop,
  .version-switcher-radio::after {
    transition: none;
  }

  .version-switcher-loading {
    animation: none;
  }
}

/* ===== VERSION SWITCHER PANEL (used by iotclass-versions.js) ===== */
.version-switcher-panel {
  position: fixed;
  z-index: 10000;
  min-width: 280px;
  max-width: 380px;
  max-height: 70vh;
  background: var(--vs-bg, #FFFFFF);
  border: 1px solid var(--vs-border, #E0E0E0);
  border-radius: 12px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
  overflow: hidden;
  font-family: system-ui, -apple-system, sans-serif;
}

.version-switcher-panel .panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--vs-navy, #2C3E50);
  color: #FFFFFF;
}

.version-switcher-panel .panel-title {
  font-weight: 600;
  font-size: 14px;
}

.version-switcher-panel .panel-close {
  background: transparent;
  border: none;
  color: #FFFFFF;
  font-size: 20px;
  cursor: pointer;
  padding: 0 4px;
  opacity: 0.7;
  transition: opacity 0.15s;
}

.version-switcher-panel .panel-close:hover {
  opacity: 1;
}

.version-switcher-panel .panel-info {
  padding: 12px 16px;
  border-bottom: 1px solid var(--vs-border, #E0E0E0);
  font-size: 12px;
  color: var(--vs-text-muted, #666666);
}

.version-switcher-panel .panel-info strong {
  color: var(--vs-text, #333333);
  word-break: break-word;
}

.version-switcher-panel .panel-options {
  max-height: 300px;
  overflow-y: auto;
  padding: 8px;
}

.version-switcher-option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s;
  border: 2px solid transparent;
}

.version-switcher-option:hover {
  background: var(--vs-bg-hover, #F8F9FA);
}

.version-switcher-option--selected {
  background: rgba(22, 160, 133, 0.1);
  border-color: var(--vs-teal, #16A085);
}

.version-switcher-option .option-icon {
  font-size: 18px;
  flex-shrink: 0;
}

.version-switcher-option .option-content {
  flex: 1;
  min-width: 0;
}

.version-switcher-option .option-label {
  font-weight: 500;
  font-size: 13px;
  color: var(--vs-text, #333333);
  display: block;
}

.version-switcher-option .option-description {
  font-size: 11px;
  color: var(--vs-text-muted, #666666);
  display: block;
  margin-top: 2px;
}

.version-switcher-option .option-preview {
  width: 48px;
  height: 48px;
  border-radius: 4px;
  object-fit: cover;
  border: 1px solid var(--vs-border, #E0E0E0);
  flex-shrink: 0;
}

.version-switcher-option .option-check {
  color: var(--vs-teal, #16A085);
  font-size: 16px;
  flex-shrink: 0;
}

.version-switcher-panel .panel-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--vs-border, #E0E0E0);
  display: flex;
  justify-content: flex-end;
}

.version-switcher-panel .panel-reset {
  background: transparent;
  border: 1px solid var(--vs-border, #E0E0E0);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  color: var(--vs-text-muted, #666666);
  transition: all 0.15s;
}

.version-switcher-panel .panel-reset:hover {
  background: var(--vs-bg-hover, #F8F9FA);
  color: var(--vs-text, #333333);
}

/* Backdrop for modal-like behavior */
.version-switcher-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 9999;
}