/**
 * KennelConnect Skeleton Loading States
 * 
 * CSS animations and styles for skeleton loading screens.
 * Provides smooth, professional loading experience while components load.
 * 
 * @version 1.0.0
 * @author KennelConnect Development Team
 */

/* ==========================================================================
   Base Skeleton Styles
   ========================================================================== */

.kc-skeleton {
    animation: skeleton-fade-in 0.3s ease-in;
}

.kc-skeleton-pulse {
    animation: skeleton-pulse 1.5s ease-in-out infinite;
    background: linear-gradient(90deg, 
        rgba(255, 255, 255, 0) 0%, 
        rgba(255, 255, 255, 0.2) 20%, 
        rgba(255, 255, 255, 0.5) 60%, 
        rgba(255, 255, 255, 0)
    );
    background-size: 200% auto;
}

/* ==========================================================================
   Skeleton Animations
   ========================================================================== */

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

@keyframes skeleton-fade-in {
    0% {
        opacity: 0;
        transform: translateY(10px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes skeleton-fade-out {
    0% {
        opacity: 1;
        transform: translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateY(-10px);
    }
}

/* ==========================================================================
   Auth Skeleton Specific Styles
   ========================================================================== */

.kc-auth-skeleton .kc-skeleton-pulse {
    background-color: #f3f4f6;
}

.kc-auth-skeleton .bg-blue-100 {
    background-color: #dbeafe !important;
}

.kc-auth-skeleton .bg-blue-200 {
    background-color: #bfdbfe !important;
}

/* ==========================================================================
   Dashboard Skeleton Specific Styles
   ========================================================================== */

.kc-dashboard-skeleton {
    min-height: 600px;
}

.kc-dashboard-skeleton .stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: 0.5rem;
    border: 1px solid #e5e7eb;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    min-width: 140px;
}

.kc-dashboard-skeleton .dashboard-stats {
    display: flex;
    gap: 1rem;
    margin: 1.5rem 0;
    flex-wrap: wrap;
}

.kc-dashboard-skeleton .dashboard-navigation {
    display: flex;
    gap: 0.5rem;
    border-bottom: 1px solid #e5e7eb;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.kc-dashboard-skeleton .nav-tab {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    border-bottom: 2px solid transparent;
    background: #f9fafb;
    border-radius: 0.375rem 0.375rem 0 0;
}

.kc-dashboard-skeleton .dashboard-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.kc-dashboard-skeleton .dashboard-card {
    background: white;
    border-radius: 0.5rem;
    border: 1px solid #e5e7eb;
    overflow: hidden;
}

.kc-dashboard-skeleton .card-header {
    background: #f9fafb;
    padding: 1rem;
    border-bottom: 1px solid #e5e7eb;
}

.kc-dashboard-skeleton .card-content {
    padding: 1.5rem;
}

.kc-dashboard-skeleton .quick-actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* ==========================================================================
   Listing Skeleton Specific Styles
   ========================================================================== */

.kc-listing-skeleton .kc-skeleton-pulse {
    background-color: #f3f4f6;
}

.kc-listing-skeleton .bg-blue-200 {
    background-color: #bfdbfe !important;
}

.kc-listing-skeleton .bg-blue-300 {
    background-color: #93c5fd !important;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

/* Mobile Devices */
@media (max-width: 768px) {
    .kc-dashboard-skeleton .dashboard-stats {
        justify-content: center;
    }
    
    .kc-dashboard-skeleton .stat-card {
        min-width: 120px;
    }
    
    .kc-dashboard-skeleton .dashboard-navigation {
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 0.5rem;
    }
    
    .kc-dashboard-skeleton .nav-tab {
        white-space: nowrap;
        flex-shrink: 0;
    }
    
    .kc-listing-skeleton .grid-cols-1 {
        grid-template-columns: 1fr;
    }
}

/* Tablet Devices */
@media (min-width: 769px) and (max-width: 1024px) {
    .kc-dashboard-skeleton .dashboard-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .kc-listing-skeleton .md\\:grid-cols-2 {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Desktop Devices */
@media (min-width: 1025px) {
    .kc-dashboard-skeleton .dashboard-cards {
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    }
}

/* ==========================================================================
   Accessibility & Reduced Motion
   ========================================================================== */

/* Respect user's preference for reduced motion */
@media (prefers-reduced-motion: reduce) {
    .kc-skeleton-pulse {
        animation: none;
        background: #f3f4f6;
    }
    
    .kc-skeleton {
        animation: none;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .kc-skeleton-pulse {
        background-color: #d1d5db;
        border: 1px solid #6b7280;
    }
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

.kc-skeleton-hidden {
    display: none;
}

.kc-skeleton-fade-out {
    animation: skeleton-fade-out 0.3s ease-out forwards;
}

/* Skeleton size variants */
.kc-skeleton-sm .kc-skeleton-pulse {
    height: 0.75rem;
}

.kc-skeleton-md .kc-skeleton-pulse {
    height: 1rem;
}

.kc-skeleton-lg .kc-skeleton-pulse {
    height: 1.5rem;
}

.kc-skeleton-xl .kc-skeleton-pulse {
    height: 2rem;
}

/* ==========================================================================
   Dark Mode Support (Future Enhancement)
   ========================================================================== */

@media (prefers-color-scheme: dark) {
    .kc-skeleton-pulse {
        background-color: #374151;
    }
    
    .kc-auth-skeleton .kc-skeleton-pulse {
        background-color: #4b5563;
    }
    
    .kc-dashboard-skeleton .stat-card,
    .kc-dashboard-skeleton .dashboard-card {
        background: #1f2937;
        border-color: #374151;
    }
    
    .kc-dashboard-skeleton .card-header,
    .kc-dashboard-skeleton .nav-tab {
        background: #111827;
    }
}