/* Accessibility Improvements */

/* Focus visible styles */
*:focus-visible {
  outline: 2px solid #667eea;
  outline-offset: 2px;
  border-radius: 4px;
}

/* Remove outline for mouse users, keep for keyboard users */
*:focus:not(:focus-visible) {
  outline: none;
}

/* Skip to main content link */
.skip-to-main {
  position: absolute;
  top: -100px;
  left: 0;
  background: #667eea;
  color: white;
  padding: 0.75rem 1.5rem;
  text-decoration: none;
  border-radius: 0 0 8px 0;
  z-index: 10000;
  font-weight: 600;
  transition: top 0.3s;
}

.skip-to-main:focus {
  top: 0;
}

/* 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;
}

.sr-only-focusable:focus {
  position: static;
  width: auto;
  height: auto;
  padding: inherit;
  margin: inherit;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* Enhanced focus for interactive elements */
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid #667eea;
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.2);
}

/* Tab navigation indicators */
.admin-tab:focus-visible,
.filter-tab:focus-visible {
  outline: 2px solid #667eea;
  outline-offset: -2px;
  box-shadow: inset 0 0 0 2px rgba(102, 126, 234, 0.3);
}

/* Device and user cards focus */
.device-card:focus-within,
.user-card:focus-within {
  border-color: #667eea;
  box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
}

/* Modal focus trap */
.modal[aria-hidden="false"] {
  display: flex;
}

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

/* Keyboard navigation hints */
.keyboard-hint {
  display: none;
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  background: rgba(0, 0, 0, 0.9);
  color: white;
  padding: 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  z-index: 1000;
  max-width: 300px;
}

.keyboard-hint.show {
  display: block;
  animation: slideInUp 0.3s ease;
}

@keyframes slideInUp {
  from {
    transform: translateY(100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.keyboard-hint kbd {
  background: rgba(255, 255, 255, 0.2);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .btn {
    border: 2px solid currentColor;
  }

  .glass-card,
  .device-card,
  .user-card {
    border: 2px solid rgba(255, 255, 255, 0.3);
  }

  *:focus-visible {
    outline-width: 3px;
  }
}

/* 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;
  }

  .spinner,
  .skeleton,
  .pulse,
  .shimmer {
    animation: none !important;
  }

  .gradient-orb {
    animation: none !important;
  }
}

/* Color blind friendly indicators */
.status-indicator {
  position: relative;
}

.status-indicator::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.status-indicator.online::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 0.625rem;
  color: white;
}

.status-indicator.offline::after {
  content: '✕';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 0.625rem;
  color: white;
}

/* ARIA live regions */
.live-region {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

/* Error and success states with icons */
.error-message::before {
  content: '⚠️ ';
}

.success-message::before {
  content: '✓ ';
}

.info-message::before {
  content: 'ℹ️ ';
}

/* Form labels always visible */
label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

/* Required field indicator */
.required::after {
  content: ' *';
  color: #ff6b6b;
  font-weight: bold;
}

/* Form validation states */
input:invalid:not(:placeholder-shown),
select:invalid:not(:placeholder-shown),
textarea:invalid:not(:placeholder-shown) {
  border-color: #ff6b6b;
}

input:valid:not(:placeholder-shown),
select:valid:not(:placeholder-shown),
textarea:valid:not(:placeholder-shown) {
  border-color: #51cf66;
}

/* Tooltip accessibility */
[data-tooltip] {
  position: relative;
}

[data-tooltip]::after {
  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: 0.5rem 0.75rem;
  border-radius: 6px;
  font-size: 0.75rem;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 1000;
}

[data-tooltip]:hover::after,
[data-tooltip]:focus::after {
  opacity: 1;
  transform: translateX(-50%) translateY(-4px);
}

/* Keyboard shortcuts display */
.keyboard-shortcuts {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.95);
  color: white;
  padding: 2rem;
  border-radius: 12px;
  max-width: 500px;
  max-height: 80vh;
  overflow-y: auto;
  z-index: 10000;
  display: none;
}

.keyboard-shortcuts.show {
  display: block;
  animation: fadeIn 0.3s ease;
}

.keyboard-shortcuts h2 {
  margin-top: 0;
  margin-bottom: 1.5rem;
  color: white;
}

.keyboard-shortcuts-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.keyboard-shortcut {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.keyboard-shortcut-keys {
  display: flex;
  gap: 0.5rem;
}

.keyboard-shortcut-keys kbd {
  background: rgba(255, 255, 255, 0.2);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.875rem;
  border: 1px solid rgba(255, 255, 255, 0.3);
  min-width: 2rem;
  text-align: center;
}

.keyboard-shortcut-description {
  flex: 1;
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.875rem;
}

/* Close button for keyboard shortcuts */
.keyboard-shortcuts-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: transparent;
  border: none;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
  line-height: 1;
}

.keyboard-shortcuts-close:hover {
  color: #667eea;
}

/* Announce changes to screen readers */
[role="status"],
[role="alert"] {
  position: relative;
}

/* Improve button accessibility */
button:disabled,
.btn:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

button:disabled:hover,
.btn:disabled:hover {
  transform: none;
}

/* Link accessibility */
a:not([class]) {
  color: #667eea;
  text-decoration: underline;
}

a:not([class]):hover {
  color: #764ba2;
}

a:not([class]):focus-visible {
  outline: 2px solid #667eea;
  outline-offset: 2px;
}

/* Table accessibility */
table {
  border-collapse: collapse;
  width: 100%;
}

th {
  text-align: left;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.05);
  padding: 0.75rem;
}

td {
  padding: 0.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* List accessibility */
ul[role="list"],
ol[role="list"] {
  list-style: none;
  padding: 0;
}

/* Progress indicator accessibility */
[role="progressbar"] {
  position: relative;
}

[role="progressbar"]::after {
  content: attr(aria-valuenow) '%';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 0.75rem;
  font-weight: 600;
}

/* Dialog/Modal accessibility */
[role="dialog"] {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1000;
}

[role="dialog"]:focus {
  outline: none;
}

/* Menu accessibility */
[role="menu"] {
  list-style: none;
  padding: 0;
  margin: 0;
}

[role="menuitem"] {
  cursor: pointer;
  padding: 0.75rem 1rem;
}

[role="menuitem"]:hover,
[role="menuitem"]:focus {
  background: rgba(255, 255, 255, 0.1);
}

/* Tab accessibility */
[role="tablist"] {
  display: flex;
  gap: 0.5rem;
}

[role="tab"] {
  cursor: pointer;
}

[role="tab"][aria-selected="true"] {
  background: rgba(255, 255, 255, 0.1);
  border-bottom: 2px solid #667eea;
}

[role="tabpanel"] {
  padding: 1.5rem 0;
}

[role="tabpanel"][hidden] {
  display: none;
}

/* Alert accessibility */
[role="alert"] {
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
}

[role="alert"].error {
  background: rgba(255, 107, 107, 0.2);
  border: 1px solid rgba(255, 107, 107, 0.5);
}

[role="alert"].success {
  background: rgba(81, 207, 102, 0.2);
  border: 1px solid rgba(81, 207, 102, 0.5);
}

[role="alert"].info {
  background: rgba(102, 126, 234, 0.2);
  border: 1px solid rgba(102, 126, 234, 0.5);
}