/* Progressive Enhancement Styles */

/* 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:focus {
    position: static !important;
    width: auto !important;
    height: auto !important;
    padding: 0.5rem 1rem !important;
    margin: 0 !important;
    overflow: visible !important;
    clip: auto !important;
    white-space: normal !important;
    background: var(--accent-color) !important;
    color: white !important;
    border-radius: var(--border-radius) !important;
    z-index: 9999 !important;
}

/* Skip Link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    /*background: var(--accent-color);*/
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: var(--border-radius);
    z-index: 10000;
    font-weight: 600;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 6px;
}

/* Connection Status Indicator */
.connection-status {
    position: fixed;
    top: 1rem;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    z-index: 9998;
    transition: all var(--transition-fast);
    opacity: 0;
    pointer-events: none;
}

.connection-status.online {
    background: rgba(76, 175, 80, 0.9);
    color: white;
    opacity: 0;
}

.connection-status.offline {
    background: rgba(244, 67, 54, 0.9);
    color: white;
    opacity: 1;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* High Contrast Mode Enhancements */
.high-contrast {
    --primary-bg: #000000;
    --secondary-bg: #1a1a1a;
    --card-bg: #333333;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --border-color: #666666;
    --accent-color: #00ffff;
    --success-color: #00ff00;
    --warning-color: #ffff00;
    --error-color: #ff0000;
}

.high-contrast .card,
.high-contrast .btn,
.high-contrast .form-control {
    border-width: 2px;
    border-style: solid;
}

.high-contrast .btn:focus,
.high-contrast .form-control:focus,
.high-contrast a:focus {
    outline: 3px solid var(--accent-color);
    outline-offset: 2px;
}

/* Focus Indicators */
.focus-visible:focus-visible,
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
    border-radius: var(--border-radius);
}

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

/* Keyboard Navigation Hints */
.keyboard-hints {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--card-bg);
    border: 2px solid var(--accent-color);
    border-radius: var(--border-radius-large);
    padding: 2rem;
    max-width: 400px;
    z-index: 10001;
}

.keyboard-hints h2 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.keyboard-hints ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.keyboard-hints li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.keyboard-hints li:last-child {
    border-bottom: none;
}

/* Show keyboard hints on Alt+H */
.keyboard-hints.show {
    display: block;
}

/* Lazy Loading States */
[data-lazy] {
    background: var(--secondary-bg);
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

[data-lazy]::before {
    content: 'Loading...';
    color: var(--text-secondary);
    font-size: 0.9rem;
}

[data-lazy].lazy-loaded::before {
    display: none;
}

/* Loading Skeleton for Lazy Content */
.lazy-skeleton {
    background: linear-gradient(90deg, var(--secondary-bg) 25%, var(--border-color) 50%, var(--secondary-bg) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Error Boundary Styles */
.error-boundary {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.error-boundary-content {
    text-align: center;
    max-width: 500px;
    padding: 2rem;
}

.error-boundary-content h1 {
    color: var(--error-color);
    font-size: 3rem;
    margin-bottom: 1rem;
}

.error-boundary-content h2 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.error-boundary-content p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.error-boundary-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Offline Mode Styles */
.offline-mode {
    filter: grayscale(50%);
    opacity: 0.8;
}

.offline-banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--warning-color);
    color: var(--primary-bg);
    padding: 0.5rem;
    text-align: center;
    font-weight: 600;
    z-index: 9997;
    transform: translateY(-100%);
    transition: transform var(--transition-fast);
}

.offline-banner.show {
    transform: translateY(0);
}

/* Accessibility Enhancements */
.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;
}

/* 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;
    }
    
    .lazy-skeleton {
        animation: none;
        background: var(--secondary-bg);
    }
    
    .connection-status.offline {
        animation: none;
    }
}

/* Touch Device Enhancements */
@media (hover: none) and (pointer: coarse) {
    /* Larger touch targets */
    .btn,
    .nav-link,
    .card-item {
        min-height: 44px;
        min-width: 44px;
    }
    
    /* Remove hover effects on touch devices */
    .btn:hover,
    .card:hover,
    .nav-link:hover {
        transform: none;
        box-shadow: none;
    }
    
    /* Add active states for touch feedback */
    .btn:active {
        transform: scale(0.98);
        opacity: 0.8;
    }
    
    .card-item:active {
        transform: scale(0.99);
        opacity: 0.9;
    }
}

/* Print Styles */
@media print {
    .skip-link,
    .connection-status,
    .keyboard-hints,
    .offline-banner,
    .error-boundary {
        display: none !important;
    }
    
    .sr-only {
        position: static !important;
        width: auto !important;
        height: auto !important;
        clip: auto !important;
        overflow: visible !important;
    }
}

/* Performance Optimization */
.will-change-transform {
    will-change: transform;
}

.will-change-opacity {
    will-change: opacity;
}

.gpu-accelerated {
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

/* Content Loading States */
.content-loading {
    position: relative;
    overflow: hidden;
}

.content-loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    animation: loading-shimmer 1.5s infinite;
}

@keyframes loading-shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* Error States */
.error-state {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
}

.error-state .error-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.error-state h3 {
    color: var(--error-color);
    margin-bottom: 1rem;
}

.error-state p {
    margin-bottom: 2rem;
    line-height: 1.6;
}

/* Success States */
.success-state {
    text-align: center;
    padding: 2rem;
    color: var(--success-color);
}

.success-state .success-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

/* Warning States */
.warning-state {
    text-align: center;
    padding: 2rem;
    color: var(--warning-color);
}

.warning-state .warning-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

/* Responsive Text */
@media (max-width: 768px) {
    .error-boundary-content h1 {
        font-size: 2rem;
    }
    
    .keyboard-hints {
        max-width: 90%;
        padding: 1rem;
    }
    
    .error-boundary-actions {
        flex-direction: column;
        align-items: center;
    }
}

/* Dark Mode Specific Enhancements */
@media (prefers-color-scheme: dark) {
    .skip-link {
        /*background: var(--accent-color);*/
        /*color: var(--primary-bg);*/
    }
    
    .connection-status.online {
        background: rgba(76, 175, 80, 0.95);
    }
    
    .connection-status.offline {
        background: rgba(244, 67, 54, 0.95);
    }
}