/**
 * Symbol Toolbar Styles - F-030 Phase 3
 *
 * Styles for mathematical/scientific symbol insertion toolbar
 * Used in quiz keyword questions for physics, chemistry, maths
 *
 * Components:
 * - Collapsible container (.symbol-toolbar-container)
 * - Toggle button (.symbol-toolbar-toggle)
 * - Content area (.symbol-toolbar-content) - expands upward
 * - Toolbar panel (.symbol-toolbar)
 * - Categories and buttons
 */

/* ==================== COLLAPSIBLE CONTAINER ==================== */

.symbol-toolbar-container {
  margin: var(--space-md, 1rem) 0;
  position: relative;
}

/* Toggle Button */
.symbol-toolbar-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm, 0.5rem);
  padding: var(--space-sm, 0.5rem) var(--space-md, 1rem);
  background: var(--bg-secondary, #f8fafc);
  border: 1px solid var(--border, #e5e7eb);
  border-radius: var(--radius-md, 0.5rem);
  color: var(--text-secondary, #64748b);
  font-size: var(--font-sm, 0.875rem);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast, 150ms);
  position: relative;
  z-index: 2;
}

.symbol-toolbar-toggle:hover {
  background: var(--bg-hover, #e2e8f0);
  border-color: var(--accent, #2563EB);
  color: var(--accent, #2563EB);
}

.symbol-toolbar-toggle:focus-visible {
  outline: 2px solid var(--accent, #2563EB);
  outline-offset: 2px;
}

.symbol-toggle-icon {
  transition: transform var(--transition-fast, 150ms);
}

/* Icon points up when collapsed, rotates when expanded */
.symbol-toolbar-container.collapsed .symbol-toggle-icon {
  transform: rotate(180deg);
}

.symbol-toolbar-container.expanded .symbol-toggle-icon {
  transform: rotate(0deg);
}

/* Content Area (Collapsible - expands UPWARD using absolute positioning) */
.symbol-toolbar-content {
  position: absolute;
  bottom: 100%;
  left: 0;
  right: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 300ms cubic-bezier(0.4, 0, 0.2, 1),
              opacity 300ms cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 10;
  margin-bottom: var(--space-xs, 0.25rem);
  background: var(--bg-primary, #ffffff);
  border-radius: var(--radius-md, 0.5rem);
}

.symbol-toolbar-container.expanded .symbol-toolbar-content {
  max-height: 280px;
  opacity: 1;
}

/* ==================== TOOLBAR PANEL ==================== */

.symbol-toolbar {
  background: var(--bg-primary, #ffffff);
  border: 1px solid var(--border, #e5e7eb);
  border-radius: var(--radius-md, 8px);
  padding: var(--space-sm, 0.5rem);
  box-shadow: var(--shadow-lg, 0 10px 15px -3px rgba(0, 0, 0, 0.1));
}

.symbol-toolbar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-sm, 0.5rem);
  padding-bottom: var(--space-xs, 0.25rem);
  border-bottom: 1px solid var(--border, #e5e7eb);
}

.symbol-toolbar-title {
  font-size: var(--font-xs, 0.75rem);
  font-weight: 600;
  color: var(--text-secondary, #6b7280);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.symbol-toolbar-help {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent, #2563EB);
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 150ms ease-in-out;
}

.symbol-toolbar-help:hover {
  background: var(--accent-hover, #2563eb);
  transform: scale(1.1);
}

.symbol-toolbar-help:active {
  transform: scale(0.95);
}

/* ==================== CATEGORIES ==================== */

.symbol-toolbar-categories {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs, 0.25rem);
}

/* Category - Compact */
.symbol-category {
  padding: var(--space-xs, 0.25rem) 0;
}

.symbol-category-label {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  color: var(--text-muted, #94a3b8);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--space-xs, 0.25rem);
  margin-right: var(--space-sm, 0.5rem);
}

.symbol-category-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

/* ==================== SYMBOL BUTTONS ==================== */

.symbol-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  min-height: 32px;
  padding: 4px;
  background: var(--bg-secondary, #f8fafc);
  border: 1px solid var(--border, #e5e7eb);
  border-radius: var(--radius-sm, 4px);
  font-size: var(--font-base, 1rem);
  font-weight: 500;
  color: var(--text-primary, #1f2937);
  cursor: pointer;
  transition: all 150ms ease-in-out;
  user-select: none;
}

.symbol-btn:hover {
  background: var(--accent, #2563EB);
  border-color: var(--accent, #2563EB);
  color: white;
  transform: scale(1.1);
  box-shadow: var(--shadow-sm, 0 1px 2px rgba(0, 0, 0, 0.05));
}

.symbol-btn:active {
  transform: translateY(0) scale(0.95);
  box-shadow: none;
}

/* Click animation */
.symbol-btn-clicked {
  background: rgba(59, 130, 246, 0.2);
  border-color: var(--accent, #2563EB);
  animation: symbolClick 200ms ease-out;
}

@keyframes symbolClick {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(0.9);
  }
  100% {
    transform: scale(1);
  }
}

/* Focus state (keyboard navigation) */
.symbol-btn:focus {
  outline: 2px solid var(--accent, #2563EB);
  outline-offset: 2px;
}

/* Disabled state */
.symbol-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

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

/* Mobile: Touch-friendly larger buttons */
@media (max-width: 640px) {
  .symbol-toolbar {
    padding: var(--space-xs, 0.375rem);
  }

  .symbol-btn {
    min-width: 36px;
    height: 36px;
    font-size: 20px;
  }

  .symbol-category-buttons {
    gap: 6px;
  }
}

/* Tablet and up: Compact buttons */
@media (min-width: 768px) {
  .symbol-toolbar-categories {
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--space-md, 0.75rem);
  }

  .symbol-category {
    flex: 1;
    min-width: 200px;
  }
}

/* ==================== DARK MODE ==================== */

@media (prefers-color-scheme: dark) {
  .symbol-toolbar {
    background: var(--bg-secondary-dark, #1f2937);
    border-color: var(--border-dark, #374151);
  }

  .symbol-toolbar-header {
    border-bottom-color: var(--border-dark, #374151);
  }

  .symbol-toolbar-title {
    color: var(--text-secondary-dark, #9ca3af);
  }

  .symbol-category-label {
    color: var(--text-muted-dark, #6b7280);
  }

  .symbol-btn {
    background: var(--bg-tertiary-dark, #111827);
    border-color: var(--border-dark, #374151);
    color: var(--text-primary-dark, #f9fafb);
  }

  .symbol-btn:hover {
    background: rgba(59, 130, 246, 0.2);
    border-color: var(--accent-light, #60a5fa);
  }

  .symbol-btn-clicked {
    background: rgba(59, 130, 246, 0.3);
  }
}

/* ==================== ACCESSIBILITY ==================== */

/* High contrast mode */
@media (prefers-contrast: high) {
  .symbol-toolbar {
    border-width: 2px;
  }

  .symbol-btn {
    border-width: 2px;
    font-weight: 600;
  }

  .symbol-btn:hover {
    border-width: 3px;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .symbol-btn,
  .symbol-toolbar-help {
    transition: none;
    animation: none;
  }

  .symbol-btn:hover {
    transform: none;
  }

  .symbol-btn:active {
    transform: none;
  }

  .symbol-btn-clicked {
    animation: none;
  }
}

/* ==================== LOADING/ERROR STATES ==================== */

.symbol-toolbar.symbol-toolbar-loading {
  opacity: 0.6;
  pointer-events: none;
}

.symbol-toolbar.symbol-toolbar-error {
  background: rgba(239, 68, 68, 0.1);
  border-color: var(--error, #ef4444);
}

.symbol-toolbar-error-message {
  padding: var(--space-xs, 0.25rem);
  color: var(--error, #ef4444);
  font-size: var(--font-xs, 0.75rem);
  text-align: center;
}

/* ==================== COLLAPSIBLE MOBILE VIEW ==================== */

/* Mobile: Categories can be collapsed */
@media (max-width: 640px) {
  .symbol-category.collapsed .symbol-category-buttons {
    display: none;
  }

  .symbol-category-label {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--space-xs, 0.25rem);
    padding: var(--space-xs, 0.25rem);
    border-radius: var(--radius-sm, 4px);
  }

  .symbol-category-label:hover {
    background: rgba(59, 130, 246, 0.1);
  }

  .symbol-category-label::after {
    content: '▼';
    font-size: 10px;
    transition: transform 150ms ease-in-out;
  }

  .symbol-category.collapsed .symbol-category-label::after {
    transform: rotate(-90deg);
  }
}

/* ==================== TOOLTIP ENHANCEMENT ==================== */

/* Custom tooltip for better mobile experience */
.symbol-btn[data-tooltip]::before {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  background: rgba(0, 0, 0, 0.9);
  color: white;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 11px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 150ms ease-in-out;
  z-index: 1000;
}

.symbol-btn:hover::before {
  opacity: 1;
}

/* Arrow for tooltip */
.symbol-btn[data-tooltip]::after {
  content: '';
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-2px);
  border: 4px solid transparent;
  border-top-color: rgba(0, 0, 0, 0.9);
  opacity: 0;
  pointer-events: none;
  transition: opacity 150ms ease-in-out;
}

.symbol-btn:hover::after {
  opacity: 1;
}