/**
 * Accessibility Enhancements
 * WCAG 2.1 AA Compliant Styles
 */

/* Skip to main content link */
.skip-to-main {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--color-primary, #9370DB);
    color: white;
    padding: 1rem 2rem;
    text-decoration: none;
    font-weight: 600;
    z-index: 10000;
    border-radius: 0 0 8px 0;
    transition: top 0.3s ease;
}

.skip-to-main:focus {
    top: 0;
    outline: 3px solid #DAA520;
    outline-offset: 2px;
}

/* Focus indicators - highly visible */
*:focus {
    outline: 3px solid #9370DB;
    outline-offset: 2px;
}

button:focus,
a:focus,
input:focus,
select:focus,
textarea:focus {
    outline: 3px solid #9370DB;
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(147, 112, 219, 0.2);
}

/* Focus visible (only keyboard, not mouse) */
*:focus:not(:focus-visible) {
    outline: none;
    box-shadow: none;
}

*:focus-visible {
    outline: 3px solid #9370DB;
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(147, 112, 219, 0.2);
}

/* High contrast focus for buttons */
button:focus-visible,
.btn:focus-visible,
[role="button"]:focus-visible {
    outline: 3px solid #DAA520;
    outline-offset: 3px;
    box-shadow: 0 0 0 6px rgba(218, 165, 32, 0.3);
}

/* Screen reader only content */
.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 {
    position: static;
    width: auto;
    height: auto;
    margin: 0;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* Ensure sufficient color contrast */
:root {
    --text-high-contrast: #ffffff;
    --text-medium-contrast: #e0e0e0;
    --text-low-contrast: #b0b0b0;
    --bg-high-contrast: #000000;
    --bg-medium-contrast: #1a1a2e;
    --link-color: #88aaff;
    --link-visited: #bb88ff;
    --link-hover: #aaccff;
}

/* Ensure links have good contrast and are distinguishable */
a {
    color: var(--link-color);
    text-decoration: underline;
    text-underline-offset: 2px;
}

a:visited {
    color: var(--link-visited);
}

a:hover,
a:focus {
    color: var(--link-hover);
    text-decoration-thickness: 2px;
}

/* Button contrast */
button,
.btn {
    min-height: 44px;
    min-width: 44px;
    cursor: pointer;
}

/* Disabled state with sufficient contrast */
button:disabled,
.btn:disabled,
[aria-disabled="true"] {
    opacity: 0.6;
    cursor: not-allowed;
    background: #555;
    color: #999;
}

/* Keyboard navigation indicators */
[tabindex="-1"]:focus {
    outline: none;
}

/* Make sure interactive elements are keyboard accessible */
[role="button"]:not([tabindex]),
[role="link"]:not([tabindex]),
[onclick]:not([tabindex]):not(button):not(a) {
    cursor: pointer;
}

[role="button"]:not([tabindex]):not(button):not(a),
[role="link"]:not([tabindex]):not(a),
[onclick]:not([tabindex]):not(button):not(a) {
    -webkit-tap-highlight-color: rgba(147, 112, 219, 0.3);
}

/* Live region announcements - ONLY for dedicated announcement containers */
/* Exclude structural elements (main, section, div with IDs) that use aria-live for dynamic updates */
[aria-live="polite"]:not(main):not(section):not(#main-content):not(.view-container),
[aria-live="assertive"]:not(main):not(section):not(#main-content):not(.view-container) {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* Visible live regions */
.live-region-visible {
    position: static;
    width: auto;
    height: auto;
    overflow: visible;
    padding: 1rem;
    background: rgba(147, 112, 219, 0.2);
    border: 2px solid #9370DB;
    border-radius: 8px;
    margin: 1rem 0;
}

/* ARIA expanded/collapsed indicators */
[aria-expanded="false"] .collapse-icon::before {
    content: "▶";
    display: inline-block;
    margin-right: 0.5rem;
}

[aria-expanded="true"] .collapse-icon::before {
    content: "▼";
    display: inline-block;
    margin-right: 0.5rem;
}

/* Form labels and inputs */
label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-high-contrast);
}

input:required + label::after,
label[for]:has(+ input:required)::after {
    content: " *";
    color: #ff6b6b;
    font-weight: bold;
}

input[aria-invalid="true"],
select[aria-invalid="true"],
textarea[aria-invalid="true"] {
    border-color: #ff6b6b;
    border-width: 2px;
}

.error-message {
    color: #ff6b6b;
    font-size: 0.9rem;
    margin-top: 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

/* Modal accessibility */
.modal[aria-hidden="true"] {
    display: none;
}

.modal[aria-modal="true"] {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 9998;
}

/* 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;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    * {
        border-width: 2px;
    }

    button,
    .btn,
    a {
        outline-width: 3px;
    }
}

/* Dark mode preference */
@media (prefers-color-scheme: light) {
    :root {
        --text-high-contrast: #000000;
        --text-medium-contrast: #333333;
        --text-low-contrast: #666666;
        --bg-high-contrast: #ffffff;
        --bg-medium-contrast: #f5f5f5;
        --link-color: #0066cc;
        --link-visited: #6600cc;
        --link-hover: #0088ff;
    }
}

/* Tooltip accessibility */
[aria-describedby][role="tooltip"] {
    position: relative;
}

.tooltip {
    position: absolute;
    background: #1a1a2e;
    color: #fff;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-size: 0.9rem;
    z-index: 1000;
    pointer-events: none;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    border: 1px solid #9370DB;
}

.tooltip[aria-hidden="true"] {
    display: none;
}

/* Custom checkbox and radio with accessibility */
.custom-checkbox,
.custom-radio {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    min-height: 44px;
}

.custom-checkbox input[type="checkbox"],
.custom-radio input[type="radio"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.custom-checkbox .checkmark,
.custom-radio .checkmark {
    width: 24px;
    height: 24px;
    border: 2px solid #9370DB;
    border-radius: 4px;
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.custom-radio .checkmark {
    border-radius: 50%;
}

.custom-checkbox input:checked + .checkmark,
.custom-radio input:checked + .checkmark {
    background: #9370DB;
    border-color: #9370DB;
}

.custom-checkbox input:checked + .checkmark::after {
    content: "✓";
    color: white;
    font-weight: bold;
}

.custom-radio input:checked + .checkmark::after {
    content: "";
    width: 10px;
    height: 10px;
    background: white;
    border-radius: 50%;
}

.custom-checkbox input:focus + .checkmark,
.custom-radio input:focus + .checkmark {
    outline: 3px solid #9370DB;
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(147, 112, 219, 0.2);
}

/* Landmarks for screen readers */
main {
    display: block;
}

[role="navigation"],
[role="main"],
[role="complementary"],
[role="contentinfo"] {
    display: block;
}

/* Breadcrumb navigation */
nav[aria-label="Breadcrumb"] {
    position: sticky;
    top: 56px;
    z-index: 99;
    background: rgba(var(--color-bg-card-rgb), 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(var(--color-border-primary-rgb), 0.5);
    padding: 0.75rem 0;
    margin: 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 300ms ease;
}

nav[aria-label="Breadcrumb"].visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

nav[aria-label="Breadcrumb"] ol {
    list-style: none;
    padding: 0 2rem;
    margin: 0;
    max-width: 1400px;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.25rem;
}

nav[aria-label="Breadcrumb"] li {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    min-height: 32px;
}

nav[aria-label="Breadcrumb"] a {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 150ms ease;
}

nav[aria-label="Breadcrumb"] a:hover {
    background: rgba(var(--color-primary-rgb), 0.1);
    color: var(--color-primary, #8b7fff);
}

nav[aria-label="Breadcrumb"] a:focus-visible {
    outline: 2px solid var(--color-primary, #8b7fff);
    outline-offset: 1px;
}

nav[aria-label="Breadcrumb"] .breadcrumb-separator {
    color: var(--color-text-secondary, #adb5bd);
    padding: 0 0.125rem;
    user-select: none;
    font-size: 1rem;
}

nav[aria-label="Breadcrumb"] [aria-current="page"] {
    color: var(--color-text-primary, #f8f9fa);
    padding: 0.25rem 0.5rem;
    font-weight: 600;
}

/* Breadcrumb truncation for long paths */
@media (max-width: 1024px) {
    nav[aria-label="Breadcrumb"] ol {
        padding: 0 1.5rem;
    }

    nav[aria-label="Breadcrumb"] .breadcrumb-label {
        max-width: 120px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }
}

@media (max-width: 640px) {
    nav[aria-label="Breadcrumb"] {
        top: 60px;
        padding: 0.5rem 0;
    }

    nav[aria-label="Breadcrumb"] ol {
        padding: 0 1rem;
        gap: 0;
    }

    nav[aria-label="Breadcrumb"] li:first-child a span {
        display: none;
    }

    nav[aria-label="Breadcrumb"] li:first-child a::before {
        content: "◀";
        margin-right: 0.25rem;
    }

    nav[aria-label="Breadcrumb"] a {
        padding: 0.25rem 0.375rem;
        font-size: 0.8125rem;
    }

    nav[aria-label="Breadcrumb"] .breadcrumb-label {
        max-width: 80px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    nav[aria-label="Breadcrumb"] .breadcrumb-separator {
        padding: 0 0.0625rem;
        font-size: 0.875rem;
    }
}

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

th {
    text-align: left;
    font-weight: 600;
    background: rgba(147, 112, 219, 0.2);
    padding: 1rem;
}

td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid rgba(147, 112, 219, 0.2);
}

caption {
    padding: 1rem;
    font-weight: 600;
    font-size: 1.2rem;
    text-align: left;
}

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

    button,
    .btn,
    input,
    select {
        min-height: 48px;
        font-size: 16px;
    }
}

/* Touch target sizing */
@media (pointer: coarse) {
    button,
    .btn,
    a,
    input[type="checkbox"],
    input[type="radio"],
    select {
        min-height: 48px;
        min-width: 48px;
    }
}

/* Landing page category cards focus */
.landing-category-card:focus,
.landing-category-card:focus-visible {
    outline: 3px solid #9370DB !important;
    outline-offset: 4px !important;
    box-shadow: 0 0 0 6px rgba(147, 112, 219, 0.3) !important;
}

/* Browse category cards focus */
.category-card:focus,
.category-card:focus-visible,
.entity-card:focus,
.entity-card:focus-visible {
    outline: 3px solid #9370DB !important;
    outline-offset: 3px !important;
    box-shadow: 0 0 0 5px rgba(147, 112, 219, 0.3) !important;
}