/* Accessibility Enhancements - CSS */

/* Skip to main content link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color, #0b3b5c);
    color: white;
    padding: 8px 16px;
    text-decoration: none;
    z-index: 10000;
    border-radius: 0 0 4px 0;
    font-weight: 600;
    transition: top 0.3s;
}

.skip-link:focus {
    top: 0;
    outline: 3px solid #0f8a9d;
    outline-offset: 2px;
}

/* Focus indicators */
*:focus-visible {
    outline: 3px solid #0f8a9d;
    outline-offset: 2px;
    border-radius: 4px;
}

/* Remove outline for mouse users, keep for keyboard */
*:focus:not(:focus-visible) {
    outline: none;
}

/* Visually hidden but accessible to screen readers */
.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;
}

/* Screen reader only text */
.sr-only {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* Error messages */
.error-message {
    display: none;
    color: #dc2626;
    font-size: 0.875rem;
    margin-top: 4px;
    font-weight: 500;
}

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

/* High contrast mode support */
body.high-contrast {
    --text-color: #000;
    --bg-color: #fff;
    filter: contrast(1.2);
}

body.high-contrast.dark-mode {
    --text-color: #fff;
    --bg-color: #000;
}

/* Reduced motion support */
body.reduced-motion * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
}

/* Form field states */
input[aria-invalid="true"],
textarea[aria-invalid="true"],
select[aria-invalid="true"] {
    border-color: #dc2626;
    background-color: #fef2f2;
}

body.dark-mode input[aria-invalid="true"],
body.dark-mode textarea[aria-invalid="true"],
body.dark-mode select[aria-invalid="true"] {
    background-color: #7f1d1d;
    border-color: #ef4444;
}

/* Keyboard navigation indicators */
.nav-link:focus-visible,
.btn:focus-visible,
button:focus-visible,
a:focus-visible {
    outline: 3px solid #0f8a9d;
    outline-offset: 2px;
}

/* Table sorting indicators */
th[aria-sort] {
    cursor: pointer;
    user-select: none;
}

th[aria-sort]::after {
    content: '';
    display: inline-block;
    width: 0;
    height: 0;
    margin-left: 8px;
    vertical-align: middle;
}

th[aria-sort="ascending"]::after {
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-bottom: 5px solid currentColor;
}

th[aria-sort="descending"]::after {
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid currentColor;
}

th[aria-sort="none"]::after {
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 4px solid #cbd5e1;
    border-bottom: 4px solid #cbd5e1;
}

/* Live region (hidden but announced) */
#aria-live-region {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* Loading states with ARIA */
[aria-busy="true"] {
    position: relative;
    pointer-events: none;
    opacity: 0.6;
}

[aria-busy="true"]::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 24px;
    height: 24px;
    margin: -12px 0 0 -12px;
    border: 3px solid #0b3b5c;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Tooltips for screen readers */
[data-tooltip] {
    position: relative;
}

[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    padding: 8px 12px;
    background: #1f2937;
    color: white;
    font-size: 0.875rem;
    white-space: nowrap;
    border-radius: 6px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
    z-index: 1000;
}

[data-tooltip]:hover::after,
[data-tooltip]:focus::after {
    opacity: 1;
}

/* Disabled state clarity */
button:disabled,
input:disabled,
select:disabled,
textarea:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Required field indicators */
.required-field::after {
    content: ' *';
    color: #dc2626;
    font-weight: bold;
}

/* Print styles for accessibility */
@media print {
    .skip-link,
    .sr-only,
    #aria-live-region {
        display: none !important;
    }
}