/* Accessibility Styles - WCAG 2.1 AA Compliance */

/* Skip Link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 0 0 8px 8px;
    text-decoration: none;
    font-weight: 600;
    z-index: 10000;
    transition: top 0.3s ease;
}

.skip-link:focus {
    top: 0;
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

/* Screen Reader Only */
.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;
}

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

/* Focus Indicators */
body.keyboard-nav *:focus {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: 4px;
}

body.keyboard-nav *:focus:not(:focus-visible) {
    outline: none;
}

/* High Contrast Focus */
@media (prefers-contrast: high) {
    *:focus {
        outline: 3px solid currentColor !important;
        outline-offset: 3px !important;
    }
}

/* Focus Visible Support */
:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

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

/* Link Focus */
a:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 4px;
    border-radius: 4px;
}

/* Button Focus */
button:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

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

/* 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;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    * {
        border-width: 2px !important;
    }

    button,
    a,
    input,
    select,
    textarea {
        border: 2px solid currentColor !important;
    }

    .btn-primary,
    .btn-secondary {
        border: 3px solid currentColor !important;
    }
}

/* Forced Colors Mode (Windows High Contrast) */
@media (forced-colors: active) {
    * {
        forced-color-adjust: auto;
    }

    .btn-primary,
    .btn-secondary {
        border: 2px solid ButtonText;
    }

    a {
        color: LinkText;
    }

    a:visited {
        color: VisitedText;
    }

    button {
        border: 2px solid ButtonText;
    }
}

/* Keyboard Navigation Indicators */
body.keyboard-nav .nav-links a:focus,
body.keyboard-nav .mobile-nav-links a:focus {
    background: var(--color-bg-alt);
    outline: 3px solid var(--color-primary);
}

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

/* ARIA Hidden */
[aria-hidden="true"] {
    display: none !important;
}

/* ARIA Disabled */
[aria-disabled="true"] {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* ARIA Expanded */
[aria-expanded="false"] + * {
    display: none;
}

/* ARIA Selected */
[aria-selected="true"] {
    background: var(--color-primary);
    color: white;
}

/* ARIA Current */
[aria-current="page"] {
    font-weight: 700;
    color: var(--color-primary);
}

/* ARIA Invalid */
[aria-invalid="true"] {
    border-color: #ff3b30;
    outline-color: #ff3b30;
}

/* ARIA Required */
[aria-required="true"]::after {
    content: " *";
    color: #ff3b30;
}

/* Color Contrast Helpers */
.text-high-contrast {
    color: var(--color-text);
    background: var(--color-bg);
}

[data-theme="dark"] .text-high-contrast {
    color: var(--color-text);
    background: var(--color-bg);
}

/* Link Underlines for Better Accessibility */
@media (prefers-contrast: high) {
    a {
        text-decoration: underline !important;
    }
}

/* Touch Target Size (minimum 44x44px) */
@media (pointer: coarse) {
    button,
    a,
    input[type="checkbox"],
    input[type="radio"] {
        min-width: 44px;
        min-height: 44px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }
}

/* Hover and Focus States */
a:hover,
a:focus,
button:hover,
button:focus {
    text-decoration: underline;
}

/* Disabled State */
:disabled,
[disabled] {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Loading State */
[aria-busy="true"] {
    cursor: wait;
    opacity: 0.7;
}

/* Error Messages */
.error-message {
    color: #ff3b30;
    font-weight: 600;
    margin-top: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

/* Success Messages */
.success-message {
    color: #34c759;
    font-weight: 600;
    margin-top: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

/* Form Labels */
label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

/* Required Field Indicator */
.required::after {
    content: " *";
    color: #ff3b30;
    font-weight: 700;
}

/* Fieldset and Legend */
fieldset {
    border: 2px solid var(--color-border);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
}

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

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

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

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

/* Print Accessibility */
@media print {
    .skip-link,
    [aria-hidden="true"],
    .sr-only {
        display: none !important;
    }

    a[href]::after {
        content: " (" attr(href) ")";
    }

    abbr[title]::after {
        content: " (" attr(title) ")";
    }
}

/* Dark Mode Accessibility */
[data-theme="dark"] {
    /* Ensure sufficient contrast in dark mode */
    --color-text: #e8e8ed;
    --color-text-light: #a1a1a6;
    --color-bg: #000000;
}

/* Language Direction Support */
[dir="rtl"] {
    text-align: right;
}

[dir="ltr"] {
    text-align: left;
}

/* Responsive Text */
@media (max-width: 768px) {
    body {
        font-size: 16px; /* Minimum readable size */
    }
}

/* Zoom Support */
@media (min-resolution: 2dppx) {
    body {
        -webkit-text-size-adjust: 100%;
        text-size-adjust: 100%;
    }
}