/* WCAG 2.2 Level AA Compliant Reader CSS */
:root {
  --color-primary: #0056b3;
  --color-primary-dark: #003d82;
  --color-secondary: #6c757d;
  --color-success: #155724;
  --color-warning: #856404;
  --color-error: #721c24;
  --color-info: #0c5460;
  
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-bg-tertiary: #e9ecef;
  --color-bg-dark: #212529;
  
  --color-text-primary: #212529;
  --color-text-secondary: #495057;
  --color-text-muted: #6c757d;
  --color-text-inverse: #ffffff;
  
  --color-border-light: #dee2e6;
  --color-border-medium: #adb5bd;
  --color-border-dark: #495057;
  
  --color-focus: #0066cc;
  --color-focus-shadow: rgba(0, 102, 204, 0.25);
  --color-hover: #e9ecef;
  --color-active: #dee2e6;
  
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  
  --font-family-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-xxl: 1.5rem;
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-normal: 1.5;
  
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  
  --transition-fast: 0.15s ease-in-out;
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  :root {
    --color-bg-primary: #000000;
    --color-bg-secondary: #000000;
    --color-text-primary: #ffffff;
    --color-text-secondary: #ffffff;
    --color-primary: #ffff00;
    --color-border-light: #ffffff;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0s;
  }
  
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* Base Styles */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  min-height: 100vh;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--spacing-sm) var(--spacing-md);
  text-decoration: none;
  border-radius: var(--radius-sm);
  z-index: 1070;
  font-weight: var(--font-weight-medium);
}

.skip-link:focus {
  top: 6px;
}

/* Focus Management */
button:focus,
input:focus,
select:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* Screen Reader Only */
.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;
}

/* Loading Animation */
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .spinner {
    animation: none;
  }
}

/* Utility Classes */
.visually-hidden {
  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;
}

.text-center {
  text-align: center;
}

.d-none {
  display: none !important;
}

.d-block {
  display: block !important;
}