/* Neural Network Zoo - Card Grid & Card Components */

/* ===== Card Grid ===== */
.zoo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--card-gap);
    padding: 0 1.5rem 2rem;
    max-width: var(--max-width);
    margin: 0 auto;
}

/* ===== Card ===== */
.zoo-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--card-radius);
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
}

.zoo-card:hover {
    transform: translateY(-3px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-md);
    text-decoration: none;
    color: inherit;
}

/* ===== Card Thumbnail ===== */
.zoo-card__thumbnail {
    height: 200px;
    padding: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    overflow: hidden;
    transition: background-color 0.3s ease;
}

.zoo-card__thumbnail svg {
    width: 100%;
    height: 100%;
    max-width: 360px;
    transition: filter 0.3s ease;
}

/* Hover animation: brighten SVG */
.zoo-card:hover .zoo-card__thumbnail svg {
    filter: brightness(1.15);
}

/* Hover animation: pulse nodes */
.zoo-card:hover .nn-node {
    animation: node-pulse 1.5s ease-in-out infinite;
}

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

/* Hover animation: data flow through edges */
.zoo-card:hover .nn-edge {
    stroke-dasharray: 8 4;
    animation: edge-flow 1s linear infinite;
}

@keyframes edge-flow {
    to { stroke-dashoffset: -12; }
}

/* ===== Card Body ===== */
.zoo-card__body {
    padding: 1rem 1.25rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.zoo-card__title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.35rem;
    line-height: 1.3;
}

.zoo-card__year {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    font-family: var(--font-mono);
}

.zoo-card__description {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ===== Card Footer / Tags ===== */
.zoo-card__meta {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.75rem 1.25rem;
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
    transition: border-color 0.3s ease;
}

.zoo-card__tag {
    font-size: 0.7rem;
    padding: 0.15rem 0.5rem;
    border-radius: 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    white-space: nowrap;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.zoo-card__category-badge {
    font-size: 0.7rem;
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    white-space: nowrap;
}

/* Category badge colors */
.zoo-card__category-badge--convolutional {
    background: rgba(88, 166, 255, 0.15);
    color: var(--cat-convolutional);
}

.zoo-card__category-badge--recurrent {
    background: rgba(63, 185, 80, 0.15);
    color: var(--cat-recurrent);
}

.zoo-card__category-badge--attention {
    background: rgba(240, 136, 62, 0.15);
    color: var(--cat-attention);
}

.zoo-card__category-badge--generative {
    background: rgba(188, 140, 255, 0.15);
    color: var(--cat-generative);
}

.zoo-card__category-badge--autoencoder {
    background: rgba(247, 120, 186, 0.15);
    color: var(--cat-autoencoder);
}

.zoo-card__category-badge--regularization {
    background: rgba(210, 153, 34, 0.15);
    color: var(--cat-regularization);
}

.zoo-card__category-badge--foundational {
    background: rgba(139, 148, 158, 0.15);
    color: var(--cat-foundational);
}

/* ===== Card Complexity Indicator ===== */
.zoo-card__complexity {
    margin-left: auto;
    font-size: 0.7rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.zoo-card__complexity-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--border);
}

.zoo-card__complexity-dot--active {
    background: var(--accent);
}

/* ===== Skeleton Card ===== */
.zoo-card--skeleton .zoo-card__thumbnail {
    background: var(--bg-card);
}

.zoo-card--skeleton .skeleton-thumb {
    width: 80%;
    height: 60%;
    border-radius: 8px;
}

.zoo-card--skeleton .skeleton-title {
    height: 1.1rem;
    width: 60%;
    margin-bottom: 0.5rem;
}

.zoo-card--skeleton .skeleton-text {
    height: 0.85rem;
    width: 90%;
    margin-bottom: 0.35rem;
}

.zoo-card--skeleton .skeleton-text:last-child {
    width: 70%;
}

/* ===== Empty State ===== */
.zoo-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
}

.zoo-empty__icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.zoo-empty__title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.zoo-empty__description {
    font-size: 0.9rem;
}

/* ===== Coming Soon Card ===== */
.zoo-card--coming-soon {
    opacity: 0.5;
    cursor: default;
}

.zoo-card--coming-soon:hover {
    transform: none;
    box-shadow: none;
}

.zoo-card--coming-soon .zoo-card__thumbnail {
    position: relative;
}

.zoo-card--coming-soon .zoo-card__thumbnail::after {
    content: 'Coming Soon';
    position: absolute;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .zoo-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 1rem;
        padding: 0 1rem 1.5rem;
    }

    .zoo-card__thumbnail {
        height: 160px;
    }
}

@media (max-width: 480px) {
    .zoo-grid {
        grid-template-columns: 1fr;
        padding: 0 0.75rem 1rem;
    }
}