/* ============================================
   ACCESSIBILITY IMPROVEMENTS (WCAG 2.1 AA COMPLIANCE)
   ============================================ */

/* Focus Management */
.focus-visible {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

/* Ensure all interactive elements have visible focus */
*:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

/* Better focus for interactive elements */
a:focus,
button:focus,
input:focus,
textarea:focus,
select:focus,
[tabindex]:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

/* High contrast focus for better visibility - using theme variables */
@media (prefers-contrast: high) {
    *:focus {
        outline: 3px solid var(--text-color);
        outline-offset: 2px;
    }
}

/* ARIA Labels for Screen Readers */
.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;
}

/* Show focus for keyboard users only */
.js-focus-visible :focus:not(.focus-visible) {
    outline: none;
}

/* Button Accessibility */
.btn {
    position: relative;
    min-height: 44px;
    min-width: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn[disabled] {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn[aria-disabled="true"] {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

/* Icon-only buttons need labels */
.btn-icon-only .sr-only {
    position: static;
    width: auto;
    height: auto;
    padding: 0;
    margin: 0;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* Form Accessibility */
.form-label {
    font-weight: 600;
    margin-bottom: 0.5rem;
    display: block;
}

.form-label.required::after {
    content: " *";
    color: var(--color-danger);
}

.form-control,
.form-select {
    min-height: 44px;
    padding: 0.75rem;
}

/* Required field indicators */
.form-control[required]:invalid,
.form-select[required]:invalid {
    border-color: var(--color-danger);
}

.form-control[required]:valid,
.form-select[required]:valid {
    border-color: var(--color-success);
}

/* Error states */
.form-control.error,
.form-select.error {
    border-color: var(--color-danger);
    box-shadow: 0 0 0 1px var(--color-danger);
}

.error-message {
    color: var(--color-danger);
    font-size: 0.875rem;
    margin-top: 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.error-message::before {
    content: "⚠";
    font-size: 0.75rem;
}

/* Table Accessibility */
.table {
    border-collapse: collapse;
    width: 100%;
}

.table th {
    background-color: var(--color-surface-elevated);
    color: var(--color-text-secondary);
    font-weight: 600;
    padding: 0.75rem;
    text-align: left;
    border: 1px solid var(--color-border);
}

.table td {
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
}

.table caption {
    caption-side: top;
    font-weight: 600;
    margin-bottom: 0.5rem;
    text-align: left;
}

/* Sortable table headers */
.table th[aria-sort] {
    cursor: pointer;
    position: relative;
    padding-right: 2rem;
}

.table th[aria-sort]::after {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
}

.table th[aria-sort="ascending"]::after {
    content: "▲";
}

.table th[aria-sort="descending"]::after {
    content: "▼";
}

.table th[aria-sort="none"]::after {
    content: "⇅";
    opacity: 0.5;
}

/* Card Accessibility */
.card {
    border: 1px solid var(--color-border);
    border-radius: 0.375rem;
}

.card[tabindex="0"]:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

.card-header {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border-light);
    padding: 1rem;
    font-weight: 600;
}

/* Navigation Accessibility */
.nav-link {
    min-height: 44px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.nav-link:focus,
.nav-link:hover {
    text-decoration: underline;
}

.nav-link[aria-current="page"] {
    font-weight: 600;
    text-decoration: underline;
}

/* Dropdown Accessibility */
.dropdown-menu {
    border: 1px solid var(--color-border);
    background-color: var(--color-surface);
    box-shadow: var(--shadow-sm);
}

.dropdown-item {
    display: block;
    width: 100%;
    padding: 0.5rem 1rem;
    clear: both;
    font-weight: 400;
    color: var(--color-text-primary);
    text-align: inherit;
    text-decoration: none;
    white-space: nowrap;
    background-color: transparent;
    border: 0;
    min-height: 44px;
    display: flex;
    align-items: center;
}

.dropdown-item:focus,
.dropdown-item:hover {
    color: var(--color-text-primary);
    background-color: var(--color-neutral-200);
}

.dropdown-item.active {
    color: var(--color-text-inverse);
    text-decoration: none;
    background-color: var(--color-primary-600);
}

/* Modal Accessibility */
.modal {
    z-index: 1055;
}

.modal-dialog {
    margin: 0.5rem;
    max-width: calc(100% - 1rem);
}

.modal-content {
    border: 1px solid var(--color-border);
    border-radius: 0.3rem;
    background-color: var(--color-surface);
}

.modal-header {
    padding: 1rem;
    border-bottom: 1px solid var(--color-border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    margin-bottom: 0;
    line-height: 1.5;
}

.modal-body {
    padding: 1rem;
}

.modal-footer {
    padding: 1rem;
    border-top: 1px solid var(--color-border-light);
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* Alert Accessibility */
.alert {
    border: 1px solid transparent;
    border-radius: 0.375rem;
    padding: 0.75rem 1.25rem;
    margin-bottom: 1rem;
    position: relative;
}

.alert[role="alert"] {
    /* Ensure alerts are properly announced */
}

.alert-heading {
    color: inherit;
}

.alert-link {
    font-weight: 700;
    text-decoration: underline;
}

.alert-dismissible {
    padding-right: 3rem;
}

.alert-dismissible .btn-close {
    position: absolute;
    top: 0;
    right: 0;
    z-index: 2;
    padding: 0.75rem 1.25rem;
}

/* Progress Bar Accessibility */
.progress {
    height: 1rem;
    background-color: var(--color-neutral-200);
    border-radius: 0.375rem;
}

.progress-bar {
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: hidden;
    color: var(--color-text-inverse);
    text-align: center;
    white-space: nowrap;
    background-color: var(--color-primary-500);
    transition: width 0.6s ease;
}

/* Tab Accessibility */
.nav-tabs {
    border-bottom: 1px solid var(--color-border);
}

.nav-tabs .nav-link {
    margin-bottom: -1px;
    background: 0 0;
    border: 1px solid transparent;
    border-top-left-radius: 0.375rem;
    border-top-right-radius: 0.375rem;
    padding: 0.5rem 1rem;
    text-decoration: none;
    color: var(--color-text-secondary);
}

.nav-tabs .nav-link:focus,
.nav-tabs .nav-link:hover {
    border-color: var(--color-border-light) var(--color-border-light) var(--color-border);
    background-color: var(--color-surface);
    isolation: isolate;
}

.nav-tabs .nav-link[aria-selected="true"] {
    color: var(--color-text-primary);
    background-color: var(--color-surface);
    border-color: var(--color-border) var(--color-border) var(--color-surface);
}

/* Tooltip Accessibility */
[role="tooltip"] {
    position: absolute;
    z-index: 1070;
    display: block;
    font-family: var(--bs-font-sans-serif);
    font-style: normal;
    font-weight: 400;
    line-height: 1.5;
    text-align: left;
    text-decoration: none;
    text-shadow: none;
    text-transform: none;
    letter-spacing: normal;
    word-break: normal;
    word-spacing: normal;
    white-space: normal;
    line-break: auto;
    font-size: 0.875rem;
    word-wrap: break-word;
    opacity: 0;
}

/* Color Contrast Improvements */
.text-high-contrast {
    color: var(--color-text-primary) !important;
}

.bg-high-contrast {
    background-color: var(--color-surface) !important;
    color: var(--color-text-primary) !important;
}

/* Dark mode accessibility */
[data-theme-mode="dark"] .focus-visible {
    outline-color: var(--color-primary-400);
}

[data-theme-mode="dark"] *:focus {
    outline-color: var(--color-primary-400);
}

[data-theme-mode="dark"] .btn:focus {
    outline-color: var(--color-primary-400);
}

[data-theme-mode="dark"] .form-control:focus,
[data-theme-mode="dark"] .form-select:focus {
    outline-color: var(--color-primary-400);
}

/* 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;
    }
    
    .spinner-custom {
        animation: none;
        border: 4px solid var(--color-primary-500);
        border-radius: 50%;
    }

    .skeleton {
        animation: none;
        background-color: var(--color-neutral-200);
    }
}

/* High Contrast Mode - using theme variables for consistency */
@media (prefers-contrast: high) {
    .btn {
        border: 2px solid currentColor;
    }
    
    .card {
        border: 2px solid var(--text-color);
    }
    
    .table {
        border: 2px solid var(--text-color);
    }
    
    .table th,
    .table td {
        border: 1px solid var(--text-color);
    }
}

/* Print Accessibility */
@media print {
    .no-print {
        display: none !important;
    }
    
    a[href^="http"]:after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        color: var(--text-muted);
    }
    
    .btn:after {
        content: " [" attr(aria-label) "]";
        font-size: 0.8em;
    }
}

/* Screen Reader Only Improvements */
.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;
}

/* Focus trap for modals */
.focus-trap {
    position: relative;
}

.focus-trap:before,
.focus-trap:after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 1px;
    height: 1px;
    opacity: 0;
    pointer-events: none;
}

.focus-trap:before {
    z-index: 1;
}

.focus-trap:after {
    z-index: -1;
}

/* Responsive Accessibility */
@media (max-width: 768px) {
    .btn {
        min-height: 48px; /* Larger touch targets on mobile */
        min-width: 48px;
    }
    
    .form-control,
    .form-select {
        min-height: 48px;
    }
    
    .nav-link {
        min-height: 48px;
        padding: 0.75rem 1rem;
    }
    
    .dropdown-item {
        min-height: 48px;
        padding: 0.75rem 1rem;
    }
}

/* ARIA Live Regions */
.aria-live-polite {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.aria-live-assertive {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* Status Announcements */
.status-announcement {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* Keyboard Navigation Enhancement */
.keyboard-user .focus-within {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

/* Landmark Roles */
[role="banner"] {
    /* Header/navigation */
}

[role="navigation"] {
    /* Navigation menus */
}

[role="main"] {
    /* Main content */
}

[role="complementary"] {
    /* Sidebar/asides */
}

[role="contentinfo"] {
    /* Footer */
}

[role="search"] {
    /* Search functionality */
}

/* Form Field Groups */
.fieldset {
    border: 1px solid var(--color-border);
    padding: 1rem;
    border-radius: 0.375rem;
    margin-bottom: 1rem;
}

.fieldset-legend {
    font-weight: 600;
    padding: 0 0.5rem;
    margin-bottom: 0.5rem;
}

/* Radio and Checkbox Groups */
.form-check-group {
    border: 1px solid var(--color-border-light);
    padding: 1rem;
    border-radius: 0.375rem;
}

.form-check-group .form-check {
    margin-bottom: 0.5rem;
}

.form-check-group .form-check:last-child {
    margin-bottom: 0;
}