/**
 * CCC Schedule - Accessibility Enhancements
 * WCAG 2.1 AA Compliance Styles
 */

/* Skip Links */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: #000;
    color: #fff;
    padding: 8px 16px;
    text-decoration: none;
    border-radius: 0 0 4px 0;
    z-index: 100000;
    font-weight: 600;
}

.skip-link:focus,
.visually-hidden-focusable:focus {
    position: static;
    top: 0;
    width: auto;
    height: auto;
    padding: 8px 16px;
    margin: 8px;
    overflow: visible;
    clip: auto;
    white-space: normal;
    color: #fff;
    background-color: #0066cc;
    text-decoration: none;
    border-radius: 4px;
    outline: 3px solid #ffc107;
    outline-offset: 2px;
}

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

/* Enhanced Focus Indicators */
*:focus {
    outline: 3px solid #0066cc;
    outline-offset: 2px;
}

button:focus,
.btn:focus,
input:focus,
select:focus,
textarea:focus,
.form-control:focus,
.form-select:focus {
    outline: 3px solid #0066cc;
    outline-offset: 2px;
    box-shadow: 0 0 0 0.25rem rgba(0, 102, 204, 0.25);
}

/* High Contrast Focus for Dark Backgrounds */
.btn-primary:focus,
.btn-success:focus,
.btn-danger:focus,
.card-header:focus-within {
    outline: 3px solid #ffc107;
    outline-offset: 2px;
}

/* Keyboard Navigation Indicators */
.keyboard-focused {
    box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.5);
}

/* Enhanced Form Labels */
label {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #2c3e50;
}

/* Required Field Indicators */
.required-field::after {
    content: " *";
    color: #dc3545;
    font-weight: bold;
}

/* Form Help Text */
.form-help-text {
    font-size: 0.875rem;
    color: #6c757d;
    margin-top: 0.25rem;
}

/* Error Messages */
.error-message {
    color: #dc3545;
    font-size: 0.875rem;
    margin-top: 0.25rem;
    font-weight: 600;
}

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

/* Success Messages */
.success-message {
    color: #28a745;
    font-size: 0.875rem;
    margin-top: 0.25rem;
    font-weight: 600;
}

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

/* Loading States */
[aria-busy="true"] {
    cursor: wait;
}

.loading-spinner {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 2px solid #f3f3f3;
    border-top: 2px solid #0066cc;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    vertical-align: middle;
    margin-right: 0.5rem;
}

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

/* Dropdown Enhancements */
.dropdown-menu {
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border: 1px solid #dee2e6;
}

.dropdown-item:hover,
.dropdown-item:focus {
    background-color: #f8f9fa;
    outline: 2px solid #0066cc;
    outline-offset: -2px;
}

.dropdown-item[role="menuitem"]:focus {
    background-color: #e9ecef;
}

/* Modal Focus Management */
.modal {
    overflow-y: auto;
}

.modal-content:focus {
    outline: none;
}

.modal-header .btn-close:focus {
    outline: 3px solid #ffc107;
    outline-offset: 2px;
}

/* Time Range Slider Enhancements */
input[type="range"] {
    width: 100%;
    height: 44px;
    background: transparent;
    cursor: pointer;
}

input[type="range"]:focus {
    outline: 3px solid #0066cc;
    outline-offset: 2px;
}

input[type="range"]::-webkit-slider-thumb {
    width: 24px;
    height: 24px;
    background: #0066cc;
    cursor: pointer;
    border-radius: 50%;
    border: 2px solid #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: #0066cc;
    cursor: pointer;
    border-radius: 50%;
    border: 2px solid #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Color Contrast Improvements */
.text-muted {
    color: #495057 !important; /* Darker gray for better contrast */
}

.badge {
    font-weight: 600;
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
}

/* Status Indicators with Icons */
.status-open::before {
    content: "● ";
    color: #28a745;
}

.status-waitlist::before {
    content: "● ";
    color: #ffc107;
}

.status-closed::before {
    content: "● ";
    color: #dc3545;
}

/* Print Styles for Accessibility */
@media print {
    .visually-hidden,
    .sr-only {
        position: static !important;
        width: auto !important;
        height: auto !important;
        overflow: visible !important;
        clip: auto !important;
        white-space: normal !important;
    }
    
    a[href]::after {
        content: " (" attr(href) ")";
    }
    
    abbr[title]::after {
        content: " (" attr(title) ")";
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    * {
        outline-width: 4px !important;
    }
    
    .btn {
        border-width: 2px !important;
    }
    
    .form-control,
    .form-select {
        border-width: 2px !important;
    }
}

/* 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;
    }
}

/* Touch Target Sizes */
button,
.btn,
input[type="checkbox"],
input[type="radio"],
.dropdown-item,
a {
    min-height: 44px;
    min-width: 44px;
}

.form-check {
    min-height: 44px;
    display: flex;
    align-items: center;
}

.form-check-input {
    width: 20px;
    height: 20px;
    margin-top: 0;
}

/* Improved Link Styling */
a {
    text-decoration: underline;
    text-underline-offset: 2px;
}

a:hover,
a:focus {
    text-decoration: underline;
    text-decoration-thickness: 2px;
}

/* Card Accessibility */
.card {
    border-width: 2px;
}

.card:focus-within {
    box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.25);
}

/* Search Results Accessibility */
.course-card:focus-within {
    outline: 3px solid #0066cc;
    outline-offset: 2px;
}

.section-card:focus-within {
    background-color: #f8f9fa;
}

/* Pagination Accessibility */
.page-link:focus {
    z-index: 3;
    outline: 3px solid #0066cc;
    outline-offset: 2px;
}

.page-item.disabled .page-link {
    cursor: not-allowed;
    opacity: 0.6;
}

/* Live Region Styling */
[aria-live] {
    position: relative;
}

[aria-live="polite"] {
    /* Polite announcements */
}

[aria-live="assertive"] {
    font-weight: bold;
}

/* Fieldset and Legend Styling */
fieldset {
    border: none;
    padding: 0;
    margin: 0;
}

legend:not(.visually-hidden) {
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: #2c3e50;
}

/* Enhanced Button States */
button[aria-pressed="true"] {
    background-color: #004494;
    border-color: #004494;
    box-shadow: inset 0 3px 5px rgba(0, 0, 0, 0.125);
}

button[aria-pressed="false"] {
    background-color: #6c757d;
    border-color: #6c757d;
}

/* Improved Table Accessibility */
table {
    border-collapse: collapse;
}

table caption {
    font-weight: 700;
    text-align: left;
    margin-bottom: 0.5rem;
}

th {
    font-weight: 700;
    text-align: left;
}

/* Enhanced Error States */
.is-invalid {
    border-color: #dc3545;
    border-width: 2px;
}

.is-invalid:focus {
    border-color: #dc3545;
    box-shadow: 0 0 0 0.25rem rgba(220, 53, 69, 0.25);
}

/* Success States */
.is-valid {
    border-color: #28a745;
    border-width: 2px;
}

.is-valid:focus {
    border-color: #28a745;
    box-shadow: 0 0 0 0.25rem rgba(40, 167, 69, 0.25);
}