/**
 * Accessibility Enhancement Stylesheet
 * WCAG 2.1 AA Compliance improvements for Klick-Game
 * State-of-the-art 2025/2026 accessibility standards
 */

/* ===== CSS Custom Properties for accessibility theming ===== */
:root {
  --a11y-focus-color: #4A90E2;
  --a11y-focus-width: 3px;
  --a11y-focus-offset: 2px;
  --a11y-error-color: #d32f2f;
  --a11y-success-color: #2e7d32;
  --a11y-text-color: #333;
  --a11y-bg-color: #fff;
  --a11y-link-color: #0056b3;
  --a11y-link-hover-color: #003d82;
  --a11y-border-color: #ccc;
  --a11y-min-target: 44px;
}

/* ===== Skip to main content link for keyboard users ===== */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  z-index: 10000;
  padding: 0.75rem 1.5rem;
  background: #1a1a2e;
  color: #fff;
  text-decoration: none;
  font-weight: bold;
}

.skip-link:focus {
  top: 0;
}

/* ===== Focus visible improvements for keyboard navigation ===== */
:focus-visible {
  outline: 2px solid #4a9eff;
  outline-offset: 2px;
}

*:focus-visible {
  outline: var(--a11y-focus-width) solid var(--a11y-focus-color);
  outline-offset: var(--a11y-focus-offset);
  border-radius: 2px;
}

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

/* Sidebar link focus styles */
.sidebar a:focus-visible,
.sidebar-items-left a:focus-visible {
  outline: var(--a11y-focus-width) solid var(--a11y-focus-color);
  outline-offset: 1px;
  border-radius: 3px;
  background-color: rgba(74, 144, 226, 0.1);
}

/* Footer link focus styles */
.site-footer a:focus-visible {
  outline: var(--a11y-focus-width) solid var(--a11y-focus-color);
  outline-offset: var(--a11y-focus-offset);
}

/* Statusbar focus styles */
.site-content-statusbar a:focus-visible {
  outline: var(--a11y-focus-width) solid #fff;
  outline-offset: var(--a11y-focus-offset);
}

/* Ensure sufficient color contrast */
a {
  color: #0056b3;
  text-decoration: underline;
}

a:hover,
a:focus {
  color: #003d82;
  text-decoration: underline;
}

/* Button accessibility */
button,
.btn,
input[type="submit"],
input[type="button"] {
  min-height: 44px;
  min-width: 44px;
  padding: 12px 24px;
  font-size: 16px;
  line-height: 1.5;
  cursor: pointer;
  border: 2px solid transparent;
  border-radius: 4px;
  transition: all 0.2s ease;
}

button:focus,
.btn:focus {
  outline: 3px solid #4A90E2;
  outline-offset: 2px;
}

button:disabled,
.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Screen reader only text */
.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;
}

/* Skip sr-only on focus for keyboard users */
.sr-only:focus {
  position: static;
  width: auto;
  height: auto;
  padding: inherit;
  margin: inherit;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* Form accessibility improvements */
label {
  display: block;
  margin-bottom: 4px;
  font-weight: 600;
  color: #333;
}

input,
textarea,
select {
  font-size: 16px; /* Prevent zoom on iOS */
  padding: 12px;
  border: 2px solid #ccc;
  border-radius: 4px;
  width: 100%;
  max-width: 100%;
  transition: border-color 0.2s ease;
}

input:focus,
textarea:focus,
select:focus {
  border-color: #4A90E2;
  outline: 3px solid #4A90E2;
  outline-offset: 2px;
}

input[aria-invalid="true"],
textarea[aria-invalid="true"],
select[aria-invalid="true"] {
  border-color: #d32f2f;
}

/* Error message styling */
.error-message,
.field-error {
  color: #d32f2f;
  font-size: 14px;
  margin-top: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.error-message::before {
  content: "⚠";
  font-weight: bold;
}

/* Success message styling */
.success-message {
  color: #2e7d32;
  font-size: 14px;
  margin-top: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.success-message::before {
  content: "✓";
  font-weight: bold;
}

/* Loading state accessibility */
.loading {
  position: relative;
}

.loading::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 3px solid #f3f3f3;
  border-top: 3px solid #4A90E2;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  * {
    border-color: #000 !important;
  }

  a {
    text-decoration: underline;
    font-weight: bold;
  }
}

/* Enhanced high contrast support */
@media (prefers-contrast: more) {
  body { background: #000 !important; color: #fff !important; }
  a { color: #6db3f2 !important; text-decoration: underline !important; }
  .site-content-main { border: 1px solid #666; }
}

/* 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;
  }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --border-color: #444;
    --link-color: #6bb6ff;
  }
  
  body {
    background-color: var(--bg-color);
    color: var(--text-color);
  }
  
  input,
  textarea,
  select {
    background-color: #2a2a2a;
    color: var(--text-color);
    border-color: var(--border-color);
  }
  
  a {
    color: var(--link-color);
  }
}

/* Touch target improvements for mobile */
@media (pointer: coarse) {
  button,
  .btn,
  a,
  input,
  textarea,
  select {
    min-height: 48px;
    min-width: 48px;
  }
}

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

th {
  text-align: left;
  font-weight: 600;
  padding: 12px;
  border-bottom: 2px solid #ddd;
}

td {
  padding: 12px;
  border-bottom: 1px solid #eee;
}

/* Caption for screen readers */
caption {
  padding: 12px;
  text-align: left;
  font-weight: 600;
  font-size: 1.1em;
}

/* Responsive images */
img {
  max-width: 100%;
  height: auto;
}

/* Alt text requirement indicator */
img:not([alt]) {
  outline: 3px solid red;
}

/* Modal accessibility */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.modal-content {
  background: #fff;
  padding: 24px;
  border-radius: 8px;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  padding: 4px;
}

/* Landmark regions for screen readers */
header,
nav,
main,
aside,
footer {
  display: block;
}

/* Navigation accessibility */
nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

nav a {
  display: block;
  padding: 12px 16px;
  text-decoration: none;
}

nav a:focus,
nav a:hover {
  background-color: rgba(0, 0, 0, 0.1);
  text-decoration: underline;
}

/* Breadcrumb navigation */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  padding: 12px 0;
}

.breadcrumb li::after {
  content: "/";
  margin-left: 8px;
  color: #999;
}

.breadcrumb li:last-child::after {
  content: "";
}

/* Status messages */
.status-message {
  padding: 12px 16px;
  border-radius: 4px;
  margin: 16px 0;
  border-left: 4px solid;
}

.status-message.info {
  background-color: #e3f2fd;
  border-color: #2196f3;
  color: #0d47a1;
}

.status-message.warning {
  background-color: #fff3e0;
  border-color: #ff9800;
  color: #e65100;
}

.status-message.error {
  background-color: #ffebee;
  border-color: #f44336;
  color: #c62828;
}

.status-message.success {
  background-color: #e8f5e9;
  border-color: #4caf50;
  color: #1b5e20;
}

/* Pagination accessibility */
.pagination {
  display: flex;
  gap: 4px;
  justify-content: center;
  list-style: none;
  padding: 16px 0;
}

.pagination a,
.pagination span {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid #ddd;
  border-radius: 4px;
  text-decoration: none;
}

.pagination .active {
  background-color: #4A90E2;
  color: #fff;
  border-color: #4A90E2;
}

/* Print styles */
@media print {
  .no-print {
    display: none !important;
  }
  
  a[href]::after {
    content: " (" attr(href) ")";
  }
  
  *:focus {
    outline: none;
  }
}