/**
 * Accessibility Enhancements
 * WCAG 2.1 AA compliant styles
 */

/* Skip to Main Content Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: #3b82f6;
  color: white;
  padding: 8px 16px;
  text-decoration: none;
  z-index: 9999;
  border-radius: 0 0 4px 0;
  font-weight: 600;
  transition: top 0.2s ease-in-out;
}

.skip-link:focus {
  top: 0;
  outline: 3px solid #60a5fa;
  outline-offset: 2px;
}

/* Keyboard Focus Indicators - Enhanced Visibility */
body.keyboard-navigation *:focus {
  outline: 3px solid #3b82f6;
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.3);
}

/* High visibility focus for interactive elements */
body.keyboard-navigation button:focus,
body.keyboard-navigation a:focus,
body.keyboard-navigation input:focus,
body.keyboard-navigation select:focus,
body.keyboard-navigation textarea:focus,
body.keyboard-navigation [tabindex]:focus {
  outline: 3px solid #3b82f6;
  outline-offset: 2px;
  transition: outline 0.15s ease-in-out;
}

/* Special focus for navigation items */
body.keyboard-navigation .nav-link:focus {
  outline: 3px solid #00d4ff;
  outline-offset: 2px;
  background-color: rgba(0, 212, 255, 0.1);
}

/* Focus visible for cards */
body.keyboard-navigation .card:focus-within {
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

/* Screen Reader Only Content */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Show on focus for keyboard navigation */
.sr-only-focusable:active,
.sr-only-focusable:focus {
  position: static;
  width: auto;
  height: auto;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* Minimum Touch Target Size - 44x44px */
button,
a,
input[type="button"],
input[type="submit"],
input[type="reset"],
.clickable {
  min-height: 44px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Exception for small icons with padding */
.icon-btn {
  min-height: 44px;
  min-width: 44px;
  padding: 12px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  body {
    background-color: #000;
    color: #fff;
  }
  
  .card {
    border: 2px solid #fff;
    background-color: #000;
  }
  
  button {
    border: 2px solid currentColor;
  }
  
  a {
    text-decoration: underline;
  }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  .animate-spin,
  .animate-pulse {
    animation: none !important;
  }
}

/* Focus Within - Visible Container Focus */
.focus-within:focus-within {
  outline: 2px solid #3b82f6;
  outline-offset: 2px;
}

/* Loading Skeletons */
.skeleton {
  background: linear-gradient(
    90deg,
    #1f2937 25%,
    #374151 50%,
    #1f2937 75%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: 4px;
}

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

.skeleton-text {
  height: 1em;
  margin-bottom: 0.5em;
}

.skeleton-heading {
  height: 2em;
  width: 60%;
  margin-bottom: 1em;
}

.skeleton-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
}

.skeleton-card {
  height: 200px;
  border-radius: 8px;
}

/* Empty States */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1.5rem;
  text-align: center;
  color: #9ca3af;
}

.empty-state-icon {
  width: 64px;
  height: 64px;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.empty-state-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: #d1d5db;
}

.empty-state-description {
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
  max-width: 400px;
}

/* Error Messages - More Prominent */
.error-message {
  background-color: rgba(220, 38, 38, 0.1);
  border: 2px solid #dc2626;
  border-radius: 8px;
  padding: 1rem;
  margin: 1rem 0;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.error-message-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: #ef4444;
}

.error-message-content {
  flex: 1;
}

.error-message-title {
  font-weight: 600;
  color: #ef4444;
  margin-bottom: 0.25rem;
}

.error-message-description {
  color: #fca5a5;
  font-size: 0.875rem;
}

/* Success Messages */
.success-message {
  background-color: rgba(34, 197, 94, 0.1);
  border: 2px solid #22c55e;
  border-radius: 8px;
  padding: 1rem;
  margin: 1rem 0;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.success-message-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: #22c55e;
}

/* Confirmation Dialog Styles */
.confirmation-dialog {
  background-color: #1f2937;
  border: 1px solid #374151;
  border-radius: 12px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  padding: 1.5rem;
  max-width: 400px;
}

.confirmation-dialog-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: #f3f4f6;
}

.confirmation-dialog-message {
  color: #d1d5db;
  margin-bottom: 1.5rem;
  line-height: 1.5;
}

.confirmation-dialog-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
}

/* Status Indicators with ARIA */
.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 600;
}

.status-indicator::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: currentColor;
}

.status-success {
  background-color: rgba(34, 197, 94, 0.1);
  color: #22c55e;
}

.status-error {
  background-color: rgba(220, 38, 38, 0.1);
  color: #ef4444;
}

.status-warning {
  background-color: rgba(234, 179, 8, 0.1);
  color: #eab308;
}

.status-info {
  background-color: rgba(59, 130, 246, 0.1);
  color: #3b82f6;
}

/* Accessible Tables */
table {
  border-collapse: collapse;
  width: 100%;
}

th {
  text-align: left;
  font-weight: 600;
  background-color: #1f2937;
  padding: 0.75rem;
}

td {
  padding: 0.75rem;
  border-top: 1px solid #374151;
}

tr:focus-within {
  background-color: rgba(59, 130, 246, 0.05);
  outline: 2px solid #3b82f6;
  outline-offset: -2px;
}

/* Accessible Form Controls */
label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: #d1d5db;
}

input:required + label::after,
select:required + label::after,
textarea:required + label::after {
  content: ' *';
  color: #ef4444;
}

.form-hint {
  font-size: 0.875rem;
  color: #9ca3af;
  margin-top: 0.25rem;
}

input[aria-invalid="true"],
select[aria-invalid="true"],
textarea[aria-invalid="true"] {
  border-color: #dc2626 !important;
  background-color: rgba(220, 38, 38, 0.05) !important;
}

/* Accessible Modal Overlay */
.modal-overlay[aria-hidden="false"] {
  display: flex;
}

.modal-overlay[aria-hidden="true"] {
  display: none;
}

/* Live Region for Dynamic Content */
#a11y-announcer {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

/* Breadcrumb Navigation */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 0;
  font-size: 0.875rem;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #9ca3af;
}

.breadcrumb-item:not(:last-child)::after {
  content: '/';
  color: #6b7280;
}

.breadcrumb-item.active {
  color: #3b82f6;
  font-weight: 600;
}

/* Accessible Progress Bars */
.progress-bar {
  width: 100%;
  height: 8px;
  background-color: #374151;
  border-radius: 9999px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #3b82f6, #60a5fa);
  transition: width 0.3s ease-in-out;
}

/* Tooltip Accessible */
[role="tooltip"] {
  position: absolute;
  background-color: #1f2937;
  color: #f3f4f6;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  font-size: 0.875rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  z-index: 1000;
  pointer-events: none;
}

[role="tooltip"]::before {
  content: '';
  position: absolute;
  border: 6px solid transparent;
}

/* Theme Transition */
.theme-transition {
  transition: 
    background-color 0.3s ease-in-out,
    color 0.3s ease-in-out,
    border-color 0.3s ease-in-out;
}

/* Smooth theme transitions */
body,
.card,
.sidebar,
button,
input,
select,
textarea {
  transition: 
    background-color 0.3s ease-in-out,
    color 0.3s ease-in-out,
    border-color 0.3s ease-in-out;
}

/* Color Contrast Improvements */
.light {
  color: #1f2937;
  background-color: #ffffff;
}

.light .card {
  background-color: #f9fafb;
  border-color: #e5e7eb;
  color: #1f2937;
}

.light input,
.light textarea,
.light select {
  background-color: #ffffff !important;
  border-color: #d1d5db !important;
  color: #1f2937 !important;
}

.light .sidebar {
  background-color: #f9fafb;
  border-right-color: #e5e7eb;
}

.light .nav-link {
  color: #4b5563;
}

.light .nav-link:hover {
  color: #1f2937;
  background-color: #e5e7eb;
}

.light .nav-link.active {
  color: #3b82f6;
  background-color: #dbeafe;
}

/* Accessible Dropdown Menus */
.dropdown-menu[role="menu"] {
  background-color: #1f2937;
  border: 1px solid #374151;
  border-radius: 8px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  padding: 0.5rem 0;
}

.dropdown-menu [role="menuitem"] {
  padding: 0.5rem 1rem;
  color: #d1d5db;
  cursor: pointer;
  transition: background-color 0.15s ease-in-out;
}

.dropdown-menu [role="menuitem"]:hover,
.dropdown-menu [role="menuitem"]:focus {
  background-color: #374151;
  outline: none;
}

.dropdown-menu [role="menuitem"]:active {
  background-color: #4b5563;
}

/* Loading Spinner Accessible */
.spinner {
  display: inline-block;
  width: 24px;
  height: 24px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top-color: #3b82f6;
  border-radius: 50%;
  animation: spinner-rotation 0.8s linear infinite;
}

@keyframes spinner-rotation {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.spinner[aria-label]::after {
  content: attr(aria-label);
  position: absolute;
  left: -10000px;
}