/* ============================================
   PREMIUM CARD SYSTEM - Kids Learning Platform
   ============================================ */

/* Base Card Styles */
.card {
    position: relative;
    display: flex;
    flex-direction: column;
    background: white;
    border-radius: var(--border-radius-card);
    border: 1px solid rgba(0, 0, 0, 0.06);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

/* Card Padding Variants */
.card-body {
    padding: 1.5rem;
}

.card-body-lg {
    padding: 2rem;
}

.card-body-sm {
    padding: 1rem;
}

/* Interactive Card (for content, products, etc.) */
.card-interactive {
    cursor: pointer;
    will-change: transform, box-shadow;
}

.card-interactive:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card-interactive:active {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Card with Image */
.card-image {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    border-radius: 1rem 1rem 0 0;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.card-interactive:hover .card-image img {
    transform: scale(1.05);
}

img.card-image {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    border-radius: 1rem 1rem 0 0;
}

.card-image-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    min-height: 160px;
    background: linear-gradient(135deg, rgba(142, 179, 214, 0.15) 0%, rgba(107, 151, 196, 0.2) 100%);
    color: rgba(107, 151, 196, 0.35);
    font-size: 2.5rem;
}

/* Square Image Variant */
.card-image-square {
    aspect-ratio: 1 / 1;
}

/* Portrait Image Variant */
.card-image-portrait {
    aspect-ratio: 3 / 4;
}

/* Card Overlay (for image hover effects) */
.card-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.7) 0%, transparent 50%);
    opacity: 0;
    transition: opacity 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-interactive:hover .card-overlay {
    opacity: 1;
}

/* Card Header */
.card-header {
    padding: 1.5rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

/* Card Footer */
.card-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
    margin-top: auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Card Title */
.card-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-ink);
    margin: 0 0 0.5rem 0;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-title-sm {
    font-size: 1rem;
    -webkit-line-clamp: 2;
}

.card-title-lg {
    font-size: 1.5rem;
}

/* Card Description */
.card-description {
    font-size: 0.9375rem;
    color: var(--color-ink-muted);
    line-height: 1.6;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Glass Card (translucent) */
.card-glass {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(var(--blur-glass));
    -webkit-backdrop-filter: blur(var(--blur-glass));
    border: 1px solid rgba(255, 255, 255, 0.18);
    box-shadow: var(--shadow-lg);
}

/* Glass Card Dark Variant */
.card-glass-dark {
    background: rgba(107, 151, 196, 0.15);
    backdrop-filter: blur(var(--blur-glass));
    -webkit-backdrop-filter: blur(var(--blur-glass));
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Elevated Card (more shadow) */
.card-elevated {
    box-shadow: var(--shadow-lg);
}

.card-elevated:hover {
    box-shadow: var(--shadow-xl);
}

/* Gradient Border Card */
.card-gradient-border {
    background: white;
    border: 2px solid transparent;
    background-clip: padding-box;
    position: relative;
}

.card-gradient-border::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent-pink), var(--color-primary-light));
    border-radius: var(--border-radius-card);
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.card-gradient-border:hover::before {
    opacity: 1;
}

/* Stat Card (for dashboards) */
.card-stat {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    background: white;
}

.card-stat-icon {
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    color: white;
    flex-shrink: 0;
}

.card-stat-content {
    flex: 1;
}

.card-stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-ink);
    line-height: 1.2;
    margin: 0;
}

.card-stat-label {
    font-size: 0.875rem;
    color: var(--color-ink-muted);
    margin: 0.25rem 0 0 0;
}

.card-stat-trend {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    margin-top: 0.5rem;
}

.card-stat-trend-up {
    color: var(--color-success);
}

.card-stat-trend-down {
    color: var(--color-error);
}

/* Stat Card Color Variants */
.card-stat-primary .card-stat-icon {
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
}

.card-stat-success .card-stat-icon {
    background: linear-gradient(135deg, var(--color-success-light), var(--color-success));
}

.card-stat-warning .card-stat-icon {
    background: linear-gradient(135deg, var(--color-warning-light), var(--color-warning));
}

.card-stat-error .card-stat-icon {
    background: linear-gradient(135deg, var(--color-error-light), var(--color-error));
}

/* Feature Card (for marketing) */
.card-feature {
    text-align: center;
    padding: 2rem;
    background: linear-gradient(to bottom, rgba(107, 151, 196, 0.03) 0%, white 40%);
}

.card-feature-icon {
    width: 5rem;
    height: 5rem;
    margin: 0 auto 1.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    color: white;
}

.card-feature-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-ink);
    margin: 0 0 0.75rem 0;
}

.card-feature-description {
    font-size: 0.9375rem;
    color: var(--color-ink-muted);
    line-height: 1.6;
    margin: 0;
}

/* Product Card */
.card-product {
    position: relative;
}

.card-product-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.375rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    background: var(--color-error);
    color: white;
    z-index: 10;
}

.card-product-badge-new {
    background: var(--color-primary);
}

.card-product-badge-sale {
    background: var(--color-error);
}

.card-product-price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-ink);
    margin: 0.5rem 0;
}

.card-product-price-old {
    font-size: 1rem;
    color: var(--color-ink-muted);
    text-decoration: line-through;
    margin-left: 0.5rem;
}

/* Blog Card */
.card-blog {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.card-blog-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--color-ink-muted);
    margin-top: 0.75rem;
}

.card-blog-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(107, 151, 196, 0.1);
    color: var(--color-primary);
    margin-bottom: 0.75rem;
}

/* Testimonial Card */
.card-testimonial {
    padding: 2rem;
    border-right: 4px solid var(--color-primary);
    background: rgba(107, 151, 196, 0.03);
}

.card-testimonial-quote {
    font-size: 1rem;
    font-style: italic;
    color: var(--color-ink-light);
    line-height: 1.7;
    margin: 0 0 1.5rem 0;
}

.card-testimonial-author {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.card-testimonial-avatar {
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    object-fit: cover;
}

.card-testimonial-name {
    font-weight: 600;
    color: var(--color-ink);
    margin: 0;
}

.card-testimonial-role {
    font-size: 0.875rem;
    color: var(--color-ink-muted);
    margin: 0.25rem 0 0 0;
}

/* Empty State Card */
.card-empty {
    padding: 3rem 2rem;
    text-align: center;
    background: rgba(107, 151, 196, 0.02);
}

.card-empty-icon {
    font-size: 3rem;
    color: var(--color-ink-muted);
    margin-bottom: 1rem;
    opacity: 0.5;
}

.card-empty-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-ink);
    margin: 0 0 0.5rem 0;
}

.card-empty-description {
    font-size: 0.9375rem;
    color: var(--color-ink-muted);
    margin: 0 0 1.5rem 0;
}

/* Card Grid Layouts */
.card-grid {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.card-grid-2 {
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}

.card-grid-3 {
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
}

.card-grid-4 {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .card-grid,
    .card-grid-2,
    .card-grid-3,
    .card-grid-4 {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
    
    .card-body-lg {
        padding: 1.5rem;
    }
}

@media (max-width: 640px) {
    .card-grid,
    .card-grid-2,
    .card-grid-3,
    .card-grid-4 {
        grid-template-columns: 1fr;
    }
    
    .card-stat {
        padding: 1.25rem;
    }
    
    .card-stat-icon {
        width: 3rem;
        height: 3rem;
        font-size: 1.25rem;
    }
    
    .card-stat-value {
        font-size: 1.75rem;
    }
}

/* Touch Device Adjustments */
@media (hover: none) {
    .card-interactive:active {
        transform: scale(0.98);
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    .card,
    .card-image img,
    .card-overlay,
    .card-gradient-border::before {
        transition: none;
    }
    
    .card-interactive:hover {
        transform: none;
    }
    
    .card-interactive:hover .card-image img {
        transform: none;
    }
}