/* ==========================================
   ACCESSIBILITY STYLES - WCAG 2.1 AA Compliance
   ========================================== */

/* ===========================================
   Screen Reader Only Content
   Visually hidden but accessible to 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;
}

/* Allow sr-only content to become visible on focus */
.sr-only-focusable:focus,
.sr-only-focusable:active {
    position: static;
    width: auto;
    height: auto;
    padding: inherit;
    margin: inherit;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* ===========================================
   Skip Link - WCAG 2.4.1 Bypass Blocks
   =========================================== */
.skip-link {
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--primary-color);
    color: var(--text-inverse);
    padding: 1rem 2rem;
    text-decoration: none;
    font-weight: 700;
    font-size: 1rem;
    z-index: 10000;
    border: 3px solid var(--border-primary);
    box-shadow: 4px 4px 0px rgba(0, 0, 0, 0.8);
    transition: top 0.3s ease;
}

.skip-link:focus {
    top: 10px;
    outline: 3px solid var(--accent-yellow);
    outline-offset: 2px;
}

.skip-link:hover {
    background-color: var(--primary-hover);
}

/* ===========================================
   Focus Indicators - WCAG 2.4.7 Focus Visible
   Enhanced focus styles for all interactive elements
   =========================================== */
:focus {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
}

:focus:not(:focus-visible) {
    outline: none;
}

:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast focus for buttons */
.btn:focus-visible,
button:focus-visible {
    outline: 3px solid var(--accent-yellow);
    outline-offset: 2px;
    box-shadow: 0 0 0 5px rgba(255, 190, 11, 0.3);
}

/* Focus indicator for links */
a:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: 2px;
}

/* Focus indicator for form controls */
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 0;
    border-color: var(--primary-color);
}

/* ===========================================
   Mobile Menu Toggle - WCAG 2.1.1 Keyboard
   =========================================== */
.menu-toggle {
    display: none;
    background: transparent;
    border: 2px solid var(--text-inverse);
    padding: 0.5rem;
    cursor: pointer;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.menu-toggle:hover,
.menu-toggle:focus {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.menu-toggle:focus-visible {
    outline: 3px solid var(--accent-yellow);
    outline-offset: 2px;
}

.menu-icon {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
}

.menu-bar {
    display: block;
    width: 100%;
    height: 3px;
    background-color: var(--text-inverse);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* Animated hamburger to X transformation */
.menu-icon.open .menu-bar:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}

.menu-icon.open .menu-bar:nth-child(2) {
    opacity: 0;
}

.menu-icon.open .menu-bar:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

/* Mobile Navigation Styles */
@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-navbar);
        flex-direction: column;
        padding: 1rem;
        gap: 0;
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        border-top: 2px solid var(--primary-color);
    }

    .nav-menu-open {
        max-height: 400px;
        opacity: 1;
        visibility: visible;
    }

    .nav-menu li {
        width: 100%;
    }

    .nav-menu a,
    .nav-menu button {
        display: block;
        width: 100%;
        padding: 1rem;
        text-align: left;
        border-bottom: 1px solid var(--border-secondary);
    }

    .nav-menu li:last-child a,
    .nav-menu li:last-child button {
        border-bottom: none;
    }

    .theme-toggle {
        width: 100%;
        justify-content: flex-start;
    }

    .navbar .container {
        position: relative;
    }
}

/* ===========================================
   Accessible Tables - WCAG 1.3.1 Info and Relationships
   =========================================== */
.data-table {
    border-collapse: collapse;
    width: 100%;
}

.data-table caption {
    text-align: left;
    padding: 0.5rem 0;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
}

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

.data-table th[scope="col"],
.data-table th[scope="row"] {
    background-color: var(--table-header-bg);
    color: var(--text-inverse);
}

/* Keyboard-accessible table rows */
.table-row-link {
    display: block;
    padding: 0.75rem 0;
    color: inherit;
    text-decoration: none;
    font-weight: 600;
}

.table-row-link:hover,
.table-row-link:focus {
    color: var(--primary-color);
    text-decoration: underline;
}

.table-row-link:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: 2px;
}

/* ===========================================
   Accessible Charts - WCAG 1.1.1 Non-text Content
   =========================================== */
.chart-container {
    position: relative;
}

.chart-container canvas[role="img"] {
    /* Ensure canvas has proper role */
}

/* Hidden data table for screen readers */
.chart-data-table {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Show data table on focus within details element */
.chart-data-table:focus-within {
    position: static;
    width: auto;
    height: auto;
    padding: 1rem;
    margin: 1rem 0;
    overflow: visible;
    clip: auto;
    white-space: normal;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 4px;
}

/* Details/Summary for chart data */
.chart-details {
    margin-top: 0.5rem;
}

.chart-details summary {
    cursor: pointer;
    padding: 0.5rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.chart-details summary:hover,
.chart-details summary:focus {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.chart-details[open] summary {
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}

.chart-details table {
    width: 100%;
    border-collapse: collapse;
    border: 1px solid var(--border-primary);
    border-top: none;
}

.chart-details th,
.chart-details td {
    padding: 0.5rem;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
}

.chart-details th {
    background-color: var(--bg-tertiary);
    font-weight: 600;
}

/* ===========================================
   Accessible Modal - WCAG 2.4.3 Focus Order
   =========================================== */
.a11y-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--modal-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.a11y-modal.active {
    opacity: 1;
    visibility: visible;
}

.a11y-modal[aria-hidden="false"] {
    opacity: 1;
    visibility: visible;
}

.a11y-modal-content {
    background-color: var(--card-bg);
    border: 3px solid var(--border-primary);
    border-radius: 0;
    box-shadow: 8px 8px 0px rgba(0, 0, 0, 0.8);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
}

.a11y-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 2px solid var(--border-primary);
    background-color: var(--bg-secondary);
}

.a11y-modal-title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.a11y-modal-close {
    background: none;
    border: 2px solid var(--border-primary);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.a11y-modal-close:hover,
.a11y-modal-close:focus {
    background-color: var(--danger-color);
    color: var(--text-inverse);
    border-color: var(--danger-color);
}

.a11y-modal-body {
    padding: 1.5rem;
}

.a11y-modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    padding: 1.5rem;
    border-top: 2px solid var(--border-primary);
    background-color: var(--bg-secondary);
}

/* Modal types */
.a11y-modal--alert .a11y-modal-header {
    background-color: var(--warning-color);
    color: var(--badge-warning-text);
}

.a11y-modal--confirm .a11y-modal-header {
    background-color: var(--primary-color);
    color: var(--text-inverse);
}

.a11y-modal--danger .a11y-modal-header {
    background-color: var(--danger-color);
    color: var(--text-inverse);
}

/* ===========================================
   Form Accessibility - WCAG 1.3.1, 3.3.2
   =========================================== */

/* Required field indicator */
.required-indicator {
    color: var(--danger-color);
    margin-left: 0.25rem;
}

/* Error messages */
.field-error {
    display: block;
    color: var(--danger-color);
    font-size: 0.875rem;
    margin-top: 0.25rem;
    font-weight: 600;
}

/* Error state for inputs */
input[aria-invalid="true"],
select[aria-invalid="true"],
textarea[aria-invalid="true"] {
    border-color: var(--danger-color);
    box-shadow: 0 0 0 3px rgba(255, 51, 102, 0.2);
}

/* Help text association */
.help-text {
    display: block;
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

/* Fieldset and legend */
fieldset {
    border: 2px solid var(--border-primary);
    padding: 1rem;
    margin-bottom: 1rem;
}

legend {
    font-weight: 700;
    padding: 0 0.5rem;
    color: var(--text-primary);
}

/* ===========================================
   Color Contrast Helpers
   =========================================== */

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-primary: #000000;
        --border-focus: #0000FF;
    }

    .btn,
    .badge,
    .status-badge {
        border-width: 3px;
    }

    a {
        text-decoration: underline;
    }
}

/* 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;
    }

    .skip-link {
        transition: none;
    }

    .menu-bar {
        transition: none;
    }
}

/* ===========================================
   Touch Target Size - WCAG 2.5.5
   Minimum 44x44px for touch targets
   =========================================== */
@media (pointer: coarse) {
    .btn,
    button,
    .btn-icon,
    .theme-toggle,
    .menu-toggle,
    input[type="checkbox"],
    input[type="radio"],
    select {
        min-width: 44px;
        min-height: 44px;
    }

    .nav-menu a {
        min-height: 44px;
        display: flex;
        align-items: center;
    }

    /* Increase touch target for close buttons */
    .btn-close,
    .a11y-modal-close {
        min-width: 44px;
        min-height: 44px;
    }
}

/* ===========================================
   Live Regions for Dynamic Content
   =========================================== */
[aria-live="polite"],
[aria-live="assertive"] {
    /* Ensure live regions are visually hidden but accessible */
}

#a11y-announcer {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ===========================================
   Keyboard Navigation Indicators
   =========================================== */
.keyboard-user *:focus {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

/* ===========================================
   Clickable Row Alternative
   Replaces onclick on tr elements
   =========================================== */
.clickable-row {
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.clickable-row:hover {
    background-color: var(--table-row-hover);
}

.clickable-row:focus-within {
    outline: 2px solid var(--primary-color);
    outline-offset: -2px;
}

/* Primary action link in table row */
.row-action-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    display: inline-block;
    padding: 0.25rem 0;
}

.row-action-link:hover,
.row-action-link:focus {
    color: var(--primary-color);
    text-decoration: underline;
}

.row-action-link:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Mover item accessible version */
.mover-item-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    text-decoration: none;
    color: inherit;
    border: 1px solid transparent;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.mover-item-link:hover,
.mover-item-link:focus {
    background-color: var(--bg-secondary);
    border-color: var(--border-primary);
}

.mover-item-link:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}