/**
 * Accessibility Styles
 * Focus indicators, keyboard navigation, and screen reader utilities
 */

/* ============================================
   FOCUS INDICATORS
   ============================================ */

/* Remove default outline and add custom focus styles */
*:focus {
  outline: none;
}

/* Visible focus indicator for keyboard navigation */
*:focus-visible {
  outline: 3px solid var(--color-accent, #b8860b);
  outline-offset: 2px;
  border-radius: var(--radius-sm, 0.25rem);
}

/* Links */
a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  text-decoration: underline;
}

/* Buttons */
button:focus-visible,
.btn:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(184, 134, 11, 0.2);
}

/* Form inputs */
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 0;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(184, 134, 11, 0.1);
}

/* Navigation items */
.nav-menu a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  background-color: rgba(184, 134, 11, 0.1);
}

/* Cards and interactive elements */
.article-card:focus-within,
.compact-card:focus-within,
.video-card:focus-within {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* ============================================
   SKIP LINK
   ============================================ */

.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  z-index: 10000;
  padding: var(--space-3, 0.75rem) var(--space-4, 1rem);
  background-color: var(--color-primary, #1a365d);
  color: white;
  font-weight: 600;
  text-decoration: none;
  border-radius: 0 0 var(--radius-md, 0.5rem) 0;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* ============================================
   SCREEN READER ONLY
   ============================================ */

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

/* ============================================
   KEYBOARD NAVIGATION HELPERS
   ============================================ */

/* Indicate when element is keyboard-focused */
[data-keyboard-focus="true"] {
  /* Applied via JS when keyboard navigation is detected */
}

/* Hide mouse focus, show keyboard focus */
.js-focus-visible :focus:not(.focus-visible) {
  outline: none;
}

/* ============================================
   HIGH CONTRAST MODE SUPPORT
   ============================================ */

@media (prefers-contrast: high) {
  *:focus-visible {
    outline-width: 4px;
    outline-offset: 3px;
  }
  
  button:focus-visible,
  .btn:focus-visible {
    outline-width: 4px;
    box-shadow: 0 0 0 6px rgba(184, 134, 11, 0.3);
  }
}

/* ============================================
   REDUCED MOTION
   ============================================ */

@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;
  }
  
  .skip-link {
    transition: none;
  }
}

/* ============================================
   FOCUS TRAP (for modals/menus)
   ============================================ */

.focus-trap-active {
  /* Applied to body when focus trap is active */
}

.focus-trap-active *:not(.focus-trap-container *) {
  /* Prevent focus on elements outside trap */
  pointer-events: none;
}

/* ============================================
   MOBILE MENU ACCESSIBILITY
   ============================================ */

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

.nav-menu[aria-hidden="false"] {
  display: block;
}

/* ============================================
   CAROUSEL KEYBOARD NAVIGATION
   ============================================ */

.carousel-container:focus-within {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

.carousel-item:focus {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  transform: scale(1.05);
  z-index: 10;
}

/* ============================================
   FORM VALIDATION STATES
   ============================================ */

/* Invalid state */
input:invalid:not(:placeholder-shown),
textarea:invalid:not(:placeholder-shown) {
  border-color: var(--color-error, #dc2626);
}

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

input[aria-invalid="true"]:focus-visible,
textarea[aria-invalid="true"]:focus-visible {
  outline-color: var(--color-error, #dc2626);
  box-shadow: 0 0 0 4px rgba(220, 38, 38, 0.1);
}

/* Valid state */
input[aria-invalid="false"]:not(:placeholder-shown),
textarea[aria-invalid="false"]:not(:placeholder-shown) {
  border-color: var(--color-success, #16a34a);
}

/* Error message */
.form-error[role="alert"] {
  color: var(--color-error, #dc2626);
  font-size: var(--text-sm, 0.875rem);
  margin-top: var(--space-1, 0.25rem);
}

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

[aria-busy="true"] {
  opacity: 0.6;
  pointer-events: none;
  cursor: wait;
}

.loading-indicator {
  display: inline-block;
  padding: var(--space-2, 0.5rem);
  font-size: var(--text-sm, 0.875rem);
  color: var(--color-text-muted, #718096);
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
  .skip-link,
  .nav-toggle,
  .search-toggle,
  .share-buttons,
  .carousel-nav {
    display: none !important;
  }
  
  a[href]:after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }
  
  a[href^="#"]:after,
  a[href^="javascript:"]:after {
    content: "";
  }
}

/* ============================================
   DARK MODE SUPPORT (Future)
   ============================================ */

@media (prefers-color-scheme: dark) {
  /* Dark mode focus indicators would go here */
  /* Currently not implemented, but prepared for future */
}