/**
 * Accessibility Styles
 * Provides visual styling for accessibility features and enhancements
 */

/* Screen Reader Only Content */
.sr-only {
    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;
}

.sr-only-focusable:focus {
    position: static !important;
    width: auto !important;
    height: auto !important;
    padding: inherit !important;
    margin: inherit !important;
    overflow: visible !important;
    clip: auto !important;
    white-space: normal !important;
}

/* Skip Links */
.skip-links {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 9999;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: #000;
    color: #fff;
    padding: 8px 12px;
    text-decoration: none;
    border-radius: 0 0 4px 4px;
    font-size: 14px;
    font-weight: 600;
    transition: top 0.3s ease;
    z-index: 10000;
    border: 2px solid transparent;
}

.skip-link:focus {
    top: 0;
    outline: 2px solid #fff;
    outline-offset: 2px;
    border-color: #fff;
}

.skip-link:hover {
    background: #333;
}

/* Keyboard Navigation Focus Styles */
.keyboard-navigation *:focus {
    outline: 2px solid #0066cc !important;
    outline-offset: 2px !important;
}

.keyboard-navigation button:focus,
.keyboard-navigation input:focus,
.keyboard-navigation textarea:focus,
.keyboard-navigation select:focus {
    outline: 2px solid #0066cc !important;
    outline-offset: 2px !important;
    box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.2) !important;
}

.keyboard-navigation a:focus {
    outline: 2px solid #0066cc !important;
    outline-offset: 2px !important;
    background-color: rgba(0, 102, 204, 0.1) !important;
    text-decoration: underline !important;
}

/* Hide focus outline for mouse users */
:not(.keyboard-navigation) *:focus {
    outline: none;
}

/* Enhanced Focus for Interactive Elements */
.keyboard-navigation .nav__link:focus,
.keyboard-navigation .btn:focus,
.keyboard-navigation .filter__btn:focus {
    position: relative;
    z-index: 1;
}

.keyboard-navigation .project-card:focus-within {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

/* Accessibility Shortcuts Panel */
.accessibility-shortcuts {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9998;
}

.shortcuts-toggle {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: #0066cc;
    color: white;
    border: none;
    font-size: 20px;
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.shortcuts-toggle:hover,
.shortcuts-toggle:focus {
    background: #0052a3;
    transform: scale(1.1);
    outline: 2px solid #fff;
    outline-offset: 2px;
}

.shortcuts-panel {
    position: absolute;
    bottom: 60px;
    right: 0;
    width: 300px;
    background: white;
    border: 1px solid #ccc;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    max-height: 400px;
    overflow-y: auto;
}

.shortcuts-panel h3 {
    margin: 0 0 15px 0;
    font-size: 16px;
    color: #333;
    font-weight: 600;
}

.shortcuts-panel ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.shortcuts-panel li {
    margin-bottom: 8px;
    font-size: 14px;
    color: #666;
    display: flex;
    align-items: center;
    gap: 8px;
}

.shortcuts-panel kbd {
    background: #f5f5f5;
    border: 1px solid #ccc;
    border-radius: 3px;
    padding: 2px 6px;
    font-size: 12px;
    font-family: 'Courier New', monospace;
    min-width: 60px;
    text-align: center;
}

.shortcuts-close {
    position: absolute;
    top: 10px;
    right: 10px;
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: #666;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s ease;
}

.shortcuts-close:hover,
.shortcuts-close:focus {
    color: #333;
    background: #f0f0f0;
    outline: 2px solid #0066cc;
    outline-offset: 1px;
}

/* High Contrast Mode Toggle */
.high-contrast-toggle {
    position: fixed;
    bottom: 80px;
    right: 20px;
    background: #333;
    color: white;
    border: 2px solid #666;
    border-radius: 4px;
    padding: 8px 12px;
    font-size: 12px;
    cursor: pointer;
    z-index: 9997;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.3s ease;
}

.high-contrast-toggle:hover,
.high-contrast-toggle:focus {
    background: #555;
    border-color: #888;
    outline: 2px solid #fff;
    outline-offset: 2px;
}

.high-contrast-toggle .toggle-icon {
    font-size: 14px;
}

.high-contrast-toggle .toggle-text {
    font-size: 11px;
    font-weight: 500;
}

/* High Contrast Mode Styles */
.high-contrast {
    filter: contrast(150%) brightness(110%);
}

.high-contrast * {
    text-shadow: none !important;
    box-shadow: none !important;
}

.high-contrast a {
    text-decoration: underline !important;
}

.high-contrast button,
.high-contrast input,
.high-contrast textarea,
.high-contrast select {
    border: 2px solid #000 !important;
}

.high-contrast .btn {
    background: #000 !important;
    color: #fff !important;
    border: 2px solid #fff !important;
}

.high-contrast .btn:hover,
.high-contrast .btn:focus {
    background: #fff !important;
    color: #000 !important;
}

/* Form Accessibility Enhancements */
.required-indicator {
    color: #d32f2f;
    font-weight: bold;
    margin-left: 2px;
}

.form__input--error,
.form__textarea--error {
    border-color: #d32f2f !important;
    background-color: #ffeaea !important;
}

.form__input--valid,
.form__textarea--valid {
    border-color: #2e7d32 !important;
    background-color: #e8f5e8 !important;
}

.form__error {
    color: #d32f2f;
    font-size: 14px;
    margin-top: 4px;
    display: block;
}

.form__counter {
    font-size: 12px;
    color: #666;
    text-align: right;
    margin-top: 4px;
}

.form__counter--warning {
    color: #f57c00;
    font-weight: 500;
}

/* Search and Filter Accessibility */
.search__clear {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    font-size: 18px;
    color: #666;
    cursor: pointer;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s ease;
}

.search__clear:hover,
.search__clear:focus {
    background: #f0f0f0;
    color: #333;
    outline: 2px solid #0066cc;
    outline-offset: 1px;
}

.filter__btn[aria-pressed="true"] {
    background: #0066cc;
    color: white;
    border-color: #0066cc;
}

.filter__btn:focus {
    outline: 2px solid #0066cc;
    outline-offset: 2px;
    z-index: 1;
    position: relative;
}

/* Results Counter Accessibility */
.results-counter {
    background: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 4px;
    padding: 8px 12px;
    margin-bottom: 20px;
    font-size: 14px;
    color: #495057;
}

.results-counter__text {
    font-weight: 500;
}

/* Navigation Accessibility Enhancements */
.nav__menu[aria-expanded="true"] {
    display: block;
}

.nav__menu[aria-expanded="false"] {
    display: none;
}

@media (min-width: 769px) {
    .nav__menu {
        display: flex !important;
    }
}

.nav__link[aria-current="page"] {
    font-weight: 600;
    position: relative;
}

.nav__link[aria-current="page"]::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background: currentColor;
}

/* Project Card Accessibility */
.project-card {
    position: relative;
}

.project-card:focus-within {
    outline: 2px solid #0066cc;
    outline-offset: 2px;
}

.project__tech-tag {
    cursor: pointer;
    transition: all 0.2s ease;
}

.project__tech-tag:hover,
.project__tech-tag:focus {
    background: #0066cc;
    color: white;
    outline: 2px solid #0066cc;
    outline-offset: 1px;
}

/* Back to Top Button Accessibility */
.footer__back-to-top {
    transition: all 0.3s ease;
}

.footer__back-to-top:focus {
    outline: 2px solid #fff;
    outline-offset: 2px;
    transform: scale(1.1);
}

.footer__back-to-top--visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* ARIA Live Region */
#aria-live-region {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* 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;
    }
    
    .shortcuts-toggle,
    .high-contrast-toggle,
    .skip-link {
        transition: none !important;
    }
}

/* Color Contrast Helpers */
@media (prefers-contrast: high) {
    .skip-link,
    .shortcuts-toggle,
    .high-contrast-toggle {
        border: 2px solid currentColor;
    }
    
    .form__input,
    .form__textarea,
    .search__input {
        border: 2px solid #000;
    }
    
    .btn {
        border: 2px solid currentColor;
    }
}

/* Focus Management for Modals and Overlays */
.modal-open {
    overflow: hidden;
}

.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 9990;
}

.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    border-radius: 8px;
    padding: 20px;
    max-width: 90vw;
    max-height: 90vh;
    overflow-y: auto;
    z-index: 9991;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.modal:focus {
    outline: none;
}

/* Touch Target Sizes for Mobile Accessibility */
@media (max-width: 768px) {
    .nav__toggle,
    .shortcuts-toggle,
    .high-contrast-toggle,
    .search__clear,
    .shortcuts-close {
        min-width: 44px;
        min-height: 44px;
    }
    
    .filter__btn {
        min-height: 44px;
        padding: 8px 12px;
    }
    
    .project__link {
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
}

/* Print Accessibility */
@media print {
    .skip-links,
    .accessibility-shortcuts,
    .high-contrast-toggle,
    .shortcuts-panel {
        display: none !important;
    }
    
    .sr-only {
        position: static !important;
        width: auto !important;
        height: auto !important;
        padding: 0 !important;
        margin: 0 !important;
        overflow: visible !important;
        clip: auto !important;
        white-space: normal !important;
        border: 0 !important;
        font-size: 12px;
        color: #666;
    }
    
    a[href^="http"]:after {
        content: " (" attr(href) ")";
        font-size: 10px;
        color: #666;
    }
}

/* Error and Success Message Accessibility */
.form__message {
    padding: 12px 16px;
    border-radius: 4px;
    margin: 16px 0;
    border-left: 4px solid;
}

.form__message--success {
    background: #e8f5e8;
    border-color: #2e7d32;
    color: #1b5e20;
}

.form__message--error {
    background: #ffeaea;
    border-color: #d32f2f;
    color: #c62828;
}

.form__message--warning {
    background: #fff8e1;
    border-color: #f57c00;
    color: #e65100;
}

.form__message h3 {
    margin: 0 0 8px 0;
    font-size: 16px;
    font-weight: 600;
}

.form__message p {
    margin: 0;
    font-size: 14px;
    line-height: 1.4;
}

/* Loading States Accessibility */
.btn--loading {
    position: relative;
    color: transparent !important;
}

.btn--loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 16px;
    height: 16px;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

/* Responsive Accessibility Adjustments */
@media (max-width: 480px) {
    .shortcuts-panel {
        width: calc(100vw - 40px);
        right: -10px;
    }
    
    .accessibility-shortcuts {
        right: 10px;
        bottom: 10px;
    }
    
    .high-contrast-toggle {
        right: 10px;
        bottom: 70px;
    }
}

/* Dark Mode Accessibility (if implemented) */
@media (prefers-color-scheme: dark) {
    .shortcuts-panel {
        background: #2d2d2d;
        border-color: #555;
        color: #fff;
    }
    
    .shortcuts-panel h3 {
        color: #fff;
    }
    
    .shortcuts-panel li {
        color: #ccc;
    }
    
    .shortcuts-panel kbd {
        background: #444;
        border-color: #666;
        color: #fff;
    }
    
    .shortcuts-close {
        color: #ccc;
    }
    
    .shortcuts-close:hover,
    .shortcuts-close:focus {
        color: #fff;
        background: #444;
    }
}