/**
 * Accessibility Styles
 * WCAG 2.1 Level AA compliance
 */

/* ============================================
   SKIP LINKS
   ============================================ */

.ef-skip-link {
    position: absolute;
    top: -999px;
    left: -999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(1px, 1px, 1px, 1px);
    white-space: nowrap;
}

.ef-skip-link:focus {
    position: fixed;
    top: var(--spacing-4);
    left: var(--spacing-4);
    z-index: 999999;
    width: auto;
    height: auto;
    padding: var(--spacing-4) var(--spacing-6);
    background-color: var(--color-lime);
    color: var(--color-black);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    text-decoration: none;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-xl);
    clip: auto;
    overflow: visible;
}

/* ============================================
   SCREEN READER TEXT
   ============================================ */

.screen-reader-text {
    position: absolute;
    top: -999px;
    left: -999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(1px, 1px, 1px, 1px);
    white-space: nowrap;
}

.screen-reader-text:focus {
    position: static;
    width: auto;
    height: auto;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* ============================================
   FOCUS STYLES
   ============================================ */

/* Default focus outline */
*:focus {
    outline: 3px solid var(--color-lime);
    outline-offset: 2px;
}

/* Remove default outline (only when custom is applied) */
*:focus:not(:focus-visible) {
    outline: none;
}

/* Visible focus for keyboard navigation */
*:focus-visible {
    outline: 3px solid var(--color-lime);
    outline-offset: 2px;
}

/* Focus for interactive elements */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
    outline: 3px solid var(--color-lime);
    outline-offset: 2px;
    box-shadow: 0 0 0 5px rgba(215, 255, 50, 0.2);
}

/* Focus for buttons */
.ef-button:focus-visible {
    outline: 3px solid var(--color-lime);
    outline-offset: 3px;
    box-shadow: 0 0 0 5px rgba(215, 255, 50, 0.3);
}

/* Focus for product cards */
.ef-product-card:focus-within {
    outline: 3px solid var(--color-lime);
    outline-offset: 2px;
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
}

/* Focus for form inputs */
.ef-form-input:focus {
    outline: 3px solid var(--color-lime);
    outline-offset: 1px;
    border-color: var(--color-lime);
    box-shadow: 0 0 0 4px rgba(215, 255, 50, 0.15);
}

/* Focus for icon buttons */
.ef-icon-button:focus-visible {
    outline: 3px solid var(--color-lime);
    outline-offset: 2px;
    background-color: rgba(215, 255, 50, 0.1);
}

/* ============================================
   FORM ACCESSIBILITY
   ============================================ */

/* Required field indicator */
.ef-form-label .required {
    color: var(--color-orange);
    margin-left: var(--spacing-1);
    font-weight: var(--font-weight-bold);
}

/* Form field wrapper */
.ef-form-field {
    margin-bottom: var(--spacing-6);
}

.ef-form-field.has-error .ef-form-input {
    border-color: var(--color-error);
    background-color: rgba(255, 90, 31, 0.05);
}

.ef-form-field.has-error .ef-form-input:focus {
    outline-color: var(--color-error);
    box-shadow: 0 0 0 4px rgba(255, 90, 31, 0.15);
}

/* Form labels */
.ef-form-label {
    display: block;
    margin-bottom: var(--spacing-2);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-800);
}

/* Form descriptions */
.ef-form-description {
    margin-top: var(--spacing-2);
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

/* Form errors */
.ef-form-error {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    margin-top: var(--spacing-2);
    padding: var(--spacing-3);
    background-color: rgba(255, 90, 31, 0.1);
    border-left: 3px solid var(--color-error);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-sm);
    color: var(--color-error);
}

.ef-form-error::before {
    content: '⚠';
    font-size: var(--font-size-lg);
}

/* ============================================
   KEYBOARD NAVIGATION
   ============================================ */

/* Visible focus indicators for navigation */
.ef-header__nav a:focus-visible,
.ef-footer__nav a:focus-visible {
    outline: 3px solid var(--color-lime);
    outline-offset: 4px;
    background-color: rgba(215, 255, 50, 0.1);
    border-radius: var(--border-radius-sm);
}

/* Mobile menu keyboard navigation */
.ef-mobile-menu a:focus-visible {
    outline: 3px solid var(--color-lime);
    outline-offset: 2px;
    background-color: rgba(215, 255, 50, 0.15);
}

/* Card keyboard navigation */
.ef-product-card a:focus-visible {
    outline: 3px solid var(--color-lime);
    outline-offset: 2px;
}

/* ============================================
   ARIA LIVE REGIONS
   ============================================ */

[aria-live] {
    position: absolute;
    top: -999px;
    left: -999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* ============================================
   HIGH CONTRAST MODE
   ============================================ */

/* High contrast mode toggle */
.ef-high-contrast-toggle {
    position: fixed;
    top: var(--spacing-20);
    right: var(--spacing-4);
    z-index: 999;
    padding: var(--spacing-3) var(--spacing-4);
    background-color: var(--color-black);
    color: var(--color-white);
    border: 2px solid var(--color-white);
    border-radius: var(--border-radius-full);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: var(--transition-base);
}

.ef-high-contrast-toggle:hover {
    background-color: var(--color-lime);
    color: var(--color-black);
    border-color: var(--color-lime);
}

.ef-high-contrast-toggle:focus-visible {
    outline: 3px solid var(--color-lime);
    outline-offset: 3px;
}

/* High contrast mode styles */
body.high-contrast-mode {
    background-color: #000;
    color: #fff;
}

body.high-contrast-mode a {
    color: #ffff00;
    text-decoration: underline;
}

body.high-contrast-mode button {
    background-color: #000;
    color: #fff;
    border: 2px solid #fff;
}

body.high-contrast-mode .ef-button--primary {
    background-color: #ffff00;
    color: #000;
    border: 2px solid #ffff00;
}

body.high-contrast-mode img {
    filter: contrast(1.2) brightness(1.1);
}

/* ============================================
   REDUCED MOTION
   ============================================ */

/* Respect user's motion preferences */
@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;
    }
}

/* ============================================
   TOOLTIPS & POPOVERS
   ============================================ */

/* Tooltip for icon-only buttons */
[data-tooltip] {
    position: relative;
}

[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + var(--spacing-2));
    left: 50%;
    transform: translateX(-50%);
    padding: var(--spacing-2) var(--spacing-3);
    background-color: var(--color-black);
    color: var(--color-white);
    font-size: var(--font-size-xs);
    white-space: nowrap;
    border-radius: var(--border-radius-sm);
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

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

/* ============================================
   FOCUS TRAP (MODALS, DRAWERS)
   ============================================ */

/* Modal/drawer backdrop */
.ef-modal-backdrop,
.ef-cart-drawer__backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 9998;
}

/* Prevent background scrolling when modal is open */
body.modal-open,
body.drawer-open {
    overflow: hidden;
}

/* ============================================
   LANDMARK ROLES
   ============================================ */

/* Visual indication for landmarks (dev mode only) */
.ef-dev-mode [role="banner"]::before,
.ef-dev-mode [role="navigation"]::before,
.ef-dev-mode [role="main"]::before,
.ef-dev-mode [role="complementary"]::before,
.ef-dev-mode [role="contentinfo"]::before {
    content: attr(role);
    display: block;
    padding: var(--spacing-2);
    background-color: var(--color-lime);
    color: var(--color-black);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
}

/* ============================================
   COLOR CONTRAST HELPERS
   ============================================ */

/* Ensure minimum contrast for text */
.ef-text-on-dark {
    color: var(--color-white);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.ef-text-on-light {
    color: var(--color-black);
}

/* Ensure buttons have sufficient contrast */
.ef-button--secondary {
    border: 2px solid currentColor;
}

/* ============================================
   LINKS & BUTTONS
   ============================================ */

/* Visible link states */
a {
    text-decoration-skip-ink: auto;
}

a:hover {
    text-decoration: underline;
}

/* Button states */
button:disabled,
.ef-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

button[aria-pressed="true"],
.ef-button[aria-pressed="true"] {
    background-color: var(--color-lime);
    color: var(--color-black);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* ============================================
   TABLES
   ============================================ */

/* Accessible table headers */
table caption {
    padding: var(--spacing-3);
    font-weight: var(--font-weight-bold);
    text-align: left;
}

th {
    font-weight: var(--font-weight-bold);
    text-align: left;
}

/* Zebra striping for better readability */
tbody tr:nth-child(even) {
    background-color: rgba(0, 0, 0, 0.02);
}

/* ============================================
   IMAGES
   ============================================ */

/* Decorative images should have empty alt */
img[alt=""] {
    user-select: none;
}

/* Loading state for images */
img[loading="lazy"] {
    background-color: var(--color-gray-200);
}

/* ============================================
   RESPONSIVE FONT SIZES
   ============================================ */

/* Ensure minimum touch target size (44x44px) */
@media (max-width: 768px) {
    button,
    a,
    input[type="button"],
    input[type="submit"],
    [role="button"] {
        min-height: 44px;
        min-width: 44px;
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
    /* Hide non-essential elements */
    .ef-header,
    .ef-footer,
    .ef-sidebar,
    .ef-cart-drawer,
    .ef-mobile-menu,
    .ef-skip-link,
    .ef-high-contrast-toggle {
        display: none;
    }
    
    /* Ensure good contrast for printing */
    body {
        background-color: #fff;
        color: #000;
    }
    
    a {
        color: #000;
        text-decoration: underline;
    }
    
    /* Show link URLs */
    a[href^="http"]::after {
        content: " (" attr(href) ")";
        font-size: var(--font-size-xs);
    }
}

/* ============================================
   WINDOWS HIGH CONTRAST MODE
   ============================================ */

@media (prefers-contrast: high) {
    /* Increase contrast for Windows high contrast mode */
    button,
    a,
    input,
    select,
    textarea {
        border: 2px solid;
    }
    
    *:focus {
        outline: 3px solid;
        outline-offset: 3px;
    }
}