/**
 * Accessibility Styles
 * WCAG 2.1 AA Compliance
 * Keyboard Navigation, Focus Indicators, ARIA Support
 */

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

/* Enhanced focus visible for keyboard navigation */
*:focus-visible {
    outline: 3px solid var(--color-orange);
    outline-offset: 3px;
    border-radius: 2px;
}

/* Button focus states */
.btn:focus-visible {
    outline: 3px solid var(--color-orange);
    outline-offset: 3px;
    box-shadow: 0 0 0 6px rgba(249, 115, 22, 0.2);
}

/* Navigation link focus states */
.nav-link:focus-visible {
    outline: 3px solid var(--color-orange);
    outline-offset: 2px;
    background-color: rgba(249, 115, 22, 0.1);
    border-radius: var(--radius-sm);
}

/* Form input focus states */
.form-input:focus-visible,
.form-checkbox input[type="checkbox"]:focus-visible {
    outline: 3px solid var(--color-orange);
    outline-offset: 2px;
    border-color: var(--color-turquoise);
    box-shadow: 0 0 0 4px rgba(249, 115, 22, 0.15);
}

/* Card focus states for keyboard navigation */
.card:focus-visible,
.survey-card:focus-visible {
    outline: 3px solid var(--color-orange);
    outline-offset: 4px;
    box-shadow: 0 0 0 7px rgba(249, 115, 22, 0.15);
}

/* Link focus states */
a:focus-visible {
    outline: 3px solid var(--color-orange);
    outline-offset: 3px;
    border-radius: 2px;
    background-color: rgba(249, 115, 22, 0.05);
}

/* Social link focus states */
.social-link:focus-visible {
    outline: 3px solid var(--color-orange);
    outline-offset: 3px;
    box-shadow: 0 0 0 6px rgba(249, 115, 22, 0.15);
}

/* University link focus states */
.university-link:focus-visible {
    outline: 3px solid var(--color-orange);
    outline-offset: 3px;
    box-shadow: 0 0 0 6px rgba(249, 115, 22, 0.2);
}

/* Mobile menu toggle focus */
.mobile-menu-toggle:focus-visible {
    outline: 3px solid var(--color-orange);
    outline-offset: 3px;
    background-color: rgba(249, 115, 22, 0.1);
    border-radius: var(--radius-sm);
}

/* Popup close button focus */
.popup-close-btn:focus-visible,
.popup-retry-btn:focus-visible {
    outline: 3px solid var(--color-orange);
    outline-offset: 3px;
    box-shadow: 0 0 0 6px rgba(249, 115, 22, 0.2);
}

/* ===================================
   KEYBOARD NAVIGATION SUPPORT
   =================================== */

/* Make cards keyboard focusable */
.card,
.survey-card,
.contact-card,
.info-card {
    position: relative;
}

/* Keyboard activation styles */
.card:focus,
.survey-card:focus {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.15);
}

/* Skip to main content link */
.skip-to-main {
    position: absolute;
    top: -100px;
    left: 0;
    background-color: var(--color-orange);
    color: var(--color-white);
    padding: var(--spacing-md) var(--spacing-lg);
    text-decoration: none;
    font-weight: var(--font-weight-bold);
    z-index: var(--z-index-modal);
    border-radius: 0 0 var(--radius-md) 0;
    transition: top var(--transition-fast);
}

.skip-to-main:focus {
    top: 0;
    outline: 3px solid var(--color-turquoise);
    outline-offset: 3px;
}

/* ===================================
   SCREEN READER SUPPORT
   =================================== */

/* 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;
}

/* Screen reader only but focusable */
.sr-only-focusable:focus,
.sr-only-focusable:active {
    position: static;
    width: auto;
    height: auto;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

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

@media (prefers-contrast: high) {
    /* Increase border thickness */
    .btn,
    .card,
    .form-input {
        border-width: 3px;
    }
    
    /* Stronger focus indicators */
    *:focus-visible {
        outline-width: 4px;
        outline-offset: 4px;
    }
    
    /* Higher contrast text */
    body {
        color: #000000;
    }
    
    .card-description,
    .contact-value,
    .info-text {
        color: #1a1a1a;
    }
}

/* ===================================
   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;
    }
    
    /* Disable transform animations */
    .card:hover,
    .survey-card:hover,
    .btn:hover,
    .expertise-item:hover {
        transform: none !important;
    }
    
    /* Keep essential visual feedback */
    .btn:hover {
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    }
}

/* ===================================
   TOUCH TARGET SIZES
   =================================== */

/* Ensure minimum touch target size of 44x44px (WCAG 2.1 Level AAA) */
.btn,
.nav-link,
.mobile-menu-toggle,
.form-checkbox input[type="checkbox"],
.social-link,
.university-link {
    min-height: 44px;
    min-width: 44px;
}

/* Checkbox larger touch target */
.form-checkbox input[type="checkbox"] {
    width: 24px;
    height: 24px;
    cursor: pointer;
}

/* Mobile menu toggle touch target */
.mobile-menu-toggle {
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===================================
   COLOR CONTRAST ENHANCEMENTS
   =================================== */

/* Ensure WCAG AA contrast ratios (4.5:1 for normal text, 3:1 for large text) */

/* Enhanced text contrast */
.card-description {
    color: #4a5568; /* Darker for better contrast */
}

.contact-value,
.info-text,
.bio-text {
    color: #2d3748; /* Darker for better contrast */
}

/* Form label contrast */
.form-label {
    color: #1a202c; /* Darker for better readability */
}

/* Error message contrast */
.form-error {
    color: #c53030; /* Darker red for better contrast */
    font-weight: var(--font-weight-medium);
}

/* Success message contrast */
.alert-success {
    background-color: #c6f6d5;
    color: #22543d;
}

/* ===================================
   ARIA LIVE REGIONS
   =================================== */

/* Style for live regions */
[aria-live="polite"],
[aria-live="assertive"] {
    position: relative;
}

/* Status messages */
.status-message {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    font-weight: var(--font-weight-medium);
}

.status-message[role="status"] {
    background-color: #e6fffa;
    color: #234e52;
    border-left: 4px solid var(--color-turquoise);
}

.status-message[role="alert"] {
    background-color: #fff5f5;
    color: #742a2a;
    border-left: 4px solid var(--color-error);
}

/* ===================================
   KEYBOARD NAVIGATION INDICATORS
   =================================== */

/* Show keyboard navigation mode */
body.keyboard-navigation *:focus {
    outline: 3px solid var(--color-orange);
    outline-offset: 3px;
}

/* Hide focus outline for mouse users */
body:not(.keyboard-navigation) *:focus:not(:focus-visible) {
    outline: none;
}

/* ===================================
   FORM ACCESSIBILITY
   =================================== */

/* Required field indicator */
.form-label .required-indicator {
    color: var(--color-error);
    font-weight: var(--font-weight-bold);
    margin-left: var(--spacing-xs);
}

/* Form field descriptions */
.form-description-text {
    font-size: var(--font-size-sm);
    color: #4a5568;
    margin-top: var(--spacing-xs);
    display: block;
}

/* Invalid field styling */
.form-input[aria-invalid="true"] {
    border-color: var(--color-error);
    background-color: #fff5f5;
}

.form-input[aria-invalid="true"]:focus {
    box-shadow: 0 0 0 4px rgba(197, 48, 48, 0.15);
}

/* Valid field styling */
.form-input[aria-invalid="false"]:not(:placeholder-shown) {
    border-color: var(--color-success);
}

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

/* Loading indicator accessibility */
.loading-spinner[role="status"] {
    position: relative;
}

.loading-spinner::after {
    content: "Loading...";
    position: absolute;
    left: -9999px;
}

/* ===================================
   MODAL/POPUP ACCESSIBILITY
   =================================== */

/* Trap focus within modal */
.popup[role="dialog"] {
    position: fixed;
}

/* Modal backdrop */
.popup-backdrop[aria-hidden="false"] {
    display: block;
}

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

/* ===================================
   RESPONSIVE TEXT SIZING
   =================================== */

/* Support text zoom up to 200% */
@media (min-width: 320px) {
    html {
        font-size: 16px;
    }
}

/* Ensure text doesn't overflow containers when zoomed */
.card-title,
.popup-title,
.form-label {
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* ===================================
   LINK ACCESSIBILITY
   =================================== */

/* External link indicator */
a[target="_blank"]::after {
    content: " ↗";
    font-size: 0.85em;
    vertical-align: super;
    margin-left: 2px;
}

/* Remove indicator from social links (already have icons) */
.social-link[target="_blank"]::after,
.university-link[target="_blank"]::after {
    content: none;
}

/* Link underline on focus for clarity */
a:focus-visible {
    text-decoration: underline;
    text-decoration-thickness: 2px;
    text-underline-offset: 3px;
}

/* ===================================
   TABLE ACCESSIBILITY (if needed)
   =================================== */

/* Responsive table wrapper */
.table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* Table focus */
table:focus {
    outline: 3px solid var(--color-orange);
    outline-offset: 3px;
}

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

@media print {
    /* Remove interactive elements */
    .mobile-menu-toggle,
    .popup,
    .popup-backdrop {
        display: none !important;
    }
    
    /* Ensure good contrast */
    body {
        color: #000;
        background: #fff;
    }
    
    /* Show link URLs */
    a[href]::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
    }
    
    /* Remove URL from navigation links */
    .nav-link[href]::after {
        content: none;
    }
}