/* OPTIMIZED LOADING STYLES - Professional lazy loading and animations */

/* Loading States */
.optimized-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem 2rem;
    font-size: 1.2rem;
    font-weight: 500;
    color: #128c7e;
    background: linear-gradient(135deg, rgba(37, 211, 102, 0.1), rgba(18, 140, 126, 0.1));
    border-radius: 12px;
    margin: 1rem 0;
    box-shadow: 0 4px 20px rgba(37, 211, 102, 0.1);
    position: relative;
    overflow: hidden;
}

.optimized-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: shimmer 2s infinite;
}

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

/* Lazy Card Animations */
.lazy-card {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1), 
                transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    animation-delay: var(--stagger-delay, 0ms);
}

.lazy-card.visible {
    opacity: 1;
    transform: translateY(0);
    animation: slideInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Image Placeholder and Lazy Loading */
.card-image {
    position: relative;
    height: 200px;
    overflow: hidden;
    border-radius: 8px 8px 0 0;
    background: linear-gradient(135deg, #f5f5f5, #e0e0e0);
}

.image-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(37, 211, 102, 0.1), rgba(18, 140, 126, 0.1));
    z-index: 1;
    transition: opacity 0.3s ease;
}

.image-placeholder i {
    font-size: 3rem;
    color: #25d366;
    opacity: 0.5;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.5; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.1); }
}

.lazy-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 0.4s ease;
    position: relative;
    z-index: 2;
}

.lazy-image.loaded {
    opacity: 1;
}

/* Enhanced Group Card Styles */
.group-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid #f0f0f0;
    position: relative;
}

.group-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(37, 211, 102, 0.2);
    border-color: #25d366;
}

.group-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #25d366, #128c7e);
    transform: scaleX(0);
    transition: transform 0.3s ease;
    transform-origin: left;
}

.group-card:hover::before {
    transform: scaleX(1);
}

/* Badge Enhancements */
.group-badges {
    position: absolute;
    top: 10px;
    left: 10px;
    right: 10px;
    display: flex;
    justify-content: space-between;
    z-index: 3;
}

.category-badge, .country-badge {
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s ease;
}

.category-badge {
    background: rgba(37, 211, 102, 0.9);
    color: white;
}

.country-badge {
    background: rgba(0, 0, 0, 0.7);
    color: white;
}

.category-badge:hover, .country-badge:hover {
    transform: scale(1.05);
}

/* Card Content */
.card-title {
    margin: 1rem 1rem 0.5rem;
    font-size: 1.2rem;
    font-weight: 600;
    color: #333;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-description {
    margin: 0 1rem 1rem;
    color: #666;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Enhanced Join Button */
.card-actions {
    padding: 0 1rem 1rem;
}

.join-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, #25d366, #128c7e);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.join-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.join-btn:hover::before {
    left: 100%;
}

.join-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(37, 211, 102, 0.4);
    background: linear-gradient(135deg, #128c7e, #25d366);
}

.join-btn:active {
    transform: translateY(0);
}

/* Card Footer */
.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1rem 1rem;
    font-size: 0.85rem;
    color: #888;
}

.views-count {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.views-count i {
    color: #25d366;
}

/* Load More Button Enhancement */
.load-more-btn.optimized {
    background: linear-gradient(135deg, #25d366, #128c7e);
    border: none;
    color: white;
    padding: 1rem 2rem;
    border-radius: 25px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 15px rgba(37, 211, 102, 0.3);
    position: relative;
    overflow: hidden;
}

.load-more-btn.optimized::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s;
}

.load-more-btn.optimized:hover::before {
    left: 100%;
}

.load-more-btn.optimized:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 30px rgba(37, 211, 102, 0.4);
}

.load-more-btn.optimized:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

/* Error State Enhancement */
.error-state {
    text-align: center;
    padding: 3rem 2rem;
    background: linear-gradient(135deg, rgba(220, 53, 69, 0.1), rgba(255, 107, 107, 0.1));
    border-radius: 12px;
    margin: 2rem 0;
    border: 1px solid rgba(220, 53, 69, 0.2);
}

.error-state h3 {
    color: #dc3545;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.error-state p {
    color: #666;
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.retry-btn {
    background: linear-gradient(135deg, #dc3545, #c82333);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.retry-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(220, 53, 69, 0.3);
}

/* No Groups State */
.no-groups {
    text-align: center;
    padding: 3rem 2rem;
    color: #666;
    font-size: 1.1rem;
}

.no-groups a {
    color: #25d366;
    text-decoration: none;
    font-weight: 600;
}

.no-groups a:hover {
    text-decoration: underline;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .optimized-loading {
        padding: 2rem 1rem;
        font-size: 1rem;
    }
    
    .lazy-card {
        margin-bottom: 1rem;
    }
    
    .card-image {
        height: 180px;
    }
    
    .image-placeholder i {
        font-size: 2.5rem;
    }
    
    .card-title {
        font-size: 1.1rem;
    }
    
    .load-more-btn.optimized {
        width: 100%;
        max-width: 300px;
        padding: 1rem;
    }
}

/* Performance optimizations */
.lazy-card * {
    will-change: auto;
}

.lazy-card.visible * {
    will-change: unset;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    .lazy-card,
    .lazy-image,
    .join-btn,
    .load-more-btn.optimized {
        transition: none;
        animation: none;
    }
    
    .optimized-loading::before,
    .join-btn::before,
    .load-more-btn.optimized::before {
        display: none;
    }
}