/* ===== UTILITY CLASSES ===== */

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: var(--background-color);
    padding: var(--spacing-xs);
    text-decoration: none;
    border-radius: var(--radius-xs);
    z-index: 10001;
    font-weight: var(--font-weight-medium);
    font-size: 0.85rem;
    transition: all var(--transition-normal);
}

.skip-link:focus {
    top: 6px;
    outline: 2px solid var(--text-primary);
    outline-offset: 2px;
}

/* Loading states */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: loading 1.5s infinite;
}

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

/* Error states */
.error-state {
    background: rgba(255, 0, 0, 0.1);
    border: 1px solid rgba(255, 0, 0, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
    color: var(--text-secondary);
}

.error-state h3 {
    color: var(--secondary-color);
    margin-bottom: var(--spacing-sm);
}

/* Empty states */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state h3 {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

/* Content overflow handling */
.text-truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.text-wrap {
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* Performance optimizations */
.reduced-motion * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
}

/* Image loading states */
img.loading {
    filter: blur(2px);
    opacity: 0.7;
}

img.loaded {
    animation: fadeIn 0.5s ease-in;
}

img.error {
    opacity: 0.5;
    filter: grayscale(100%) brightness(0.8);
    border: 1px dashed var(--card-border);
}

/* Responsive text sizes */
@media (max-width: 768px) {
    .responsive-text-sm {
        font-size: 0.9rem;
    }
    
    .responsive-text-xs {
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .responsive-text-xs {
        font-size: 0.75rem;
    }
}

/* Focus indicators */
.focus-ring {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Skeleton loading */
.skeleton {
    background: linear-gradient(90deg, 
        var(--card-background) 25%, 
        rgba(255, 255, 255, 0.05) 50%, 
        var(--card-background) 75%
    );
    background-size: 200% 100%;
    animation: skeleton 1.5s infinite;
    border-radius: var(--radius-sm);
}

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

/* Enhanced transitions */
.smooth-transition {
    transition: all var(--transition-normal) cubic-bezier(0.4, 0, 0.2, 1);
}

/* Content sections */
.content-section {
    min-height: 200px;
}

.content-section:empty {
    display: none;
}

/* Enhanced cards */
.enhanced-card {
    position: relative;
    overflow: hidden;
}

.enhanced-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent, 
        var(--primary-color), 
        transparent
    );
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.enhanced-card:hover::before {
    opacity: 1;
}

/* Mobile optimizations */
@media (max-width: 768px) {
    .mobile-optimized {
        transform: translateZ(0);
        will-change: transform;
    }
    
    .disable-parallax {
        transform: none !important;
    }
}