/*
 * Comprehensive Focus Styles for Accessibility
 * WCAG 2.1 AA Compliant Focus Management
 */

/* Skip Links Styling */
.skip-links {
  position: absolute;
  top: -100px;
  left: 0;
  z-index: 9999;
  width: 100%;
  background: #000;
  text-align: center;
}

.skip-link {
  display: inline-block;
  padding: 0.75rem 1rem;
  background: #0a4275;
  color: white;
  text-decoration: none;
  font-weight: 600;
  border-radius: 0 0 4px 4px;
  margin: 0 0.25rem;
  transition: all 0.3s ease;
}

.skip-link:focus {
  position: relative;
  top: 100px;
  outline: 3px solid #ffd700;
  outline-offset: 2px;
}

/* Enhanced Focus Styles for All Interactive Elements */
a:focus,
button:focus,
input:focus,
textarea:focus,
select:focus,
details:focus,
summary:focus,
[tabindex]:focus {
  outline: 3px solid #0a4275;
  outline-offset: 2px;
  box-shadow: 0 0 0 1px rgba(10, 66, 117, 0.3);
  transition: all 0.2s ease;
}

/* High Contrast Focus for Better Visibility */
@media (prefers-contrast: high) {
  a:focus,
  button:focus,
  input:focus,
  textarea:focus,
  select:focus,
  details:focus,
  summary:focus,
  [tabindex]:focus {
    outline: 4px solid #000;
    outline-offset: 2px;
    background: #fff;
    color: #000;
  }
}

/* Focus-visible for Modern Browsers */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
details:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid #0a4275;
  outline-offset: 2px;
  box-shadow: 0 0 0 1px rgba(10, 66, 117, 0.3);
}

/* Remove focus outline for mouse users */
a:focus:not(:focus-visible),
button:focus:not(:focus-visible),
input:focus:not(:focus-visible),
textarea:focus:not(:focus-visible),
select:focus:not(:focus-visible),
details:focus:not(:focus-visible),
summary:focus:not(:focus-visible),
[tabindex]:focus:not(:focus-visible) {
  outline: none;
  box-shadow: none;
}

/* Enhanced Navigation Focus */
nav a:focus {
  background: rgba(10, 66, 117, 0.1);
  border-radius: 4px;
  padding: 0.25rem 0.5rem;
}

/* TOC Focus Enhancement */
.toc-list a:focus {
  background: rgba(10, 66, 117, 0.15);
  border-left: 4px solid #0a4275;
  transform: translateX(4px);
}

/* FAQ Details Focus */
details[open] summary:focus {
  background: linear-gradient(135deg, #1e40af 0%, #0a4275 100%);
  color: white;
}

/* Button Focus States */
.nav-button:focus {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(10, 66, 117, 0.3);
}

/* Card Focus for Interactive Cards */
.card:focus-within {
  box-shadow: 0 8px 25px rgba(10, 66, 117, 0.15);
  border-color: #0a4275;
}

/* Comprehensive 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;
  }

  a:focus,
  button:focus,
  input:focus,
  textarea:focus,
  select:focus,
  details:focus,
  summary:focus,
  [tabindex]:focus,
  .nav-button:focus,
  .toc-list a:focus {
    transition: none;
    transform: none;
  }
}

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

/* Focus Indicators for Screen Readers */
.sr-only:focus {
  position: absolute;
  width: auto;
  height: auto;
  padding: 0.5rem;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
  background: #0a4275;
  color: white;
  z-index: 9999;
  top: 0;
  left: 0;
}