/* --- Articles Listing Page --- */

.page-header {
    text-align: left;
    max-width: 1200px;
    margin: 40px auto 0;
    padding: 0 5%;
}

.page-header h1 {
    font-size: 2.2rem;
    font-family: 'Space Mono', monospace;
    border-left: 4px solid var(--accent-blue);
    padding-left: 20px;
}

.accent {
    color: var(--accent-blue);
}

.articles-container {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 5%;
}

/* Category Filter Buttons */
.articles-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 40px;
}

.filter-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-dim);
    padding: 8px 18px;
    font-family: 'Space Mono', monospace;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.3s;
}

.filter-btn:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

.filter-btn.active {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    color: white;
}

/* Articles Grid */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 30px;
}

/* Article Card */
.article-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 28px;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s, border-color 0.3s;
}

.article-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-4px);
}

.article-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.category-badge {
    font-family: 'Space Mono', monospace;
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 4px 10px;
    border-radius: 3px;
    border: 1px solid;
}

.category-badge[data-category="Models"] {
    color: #ff6b6b;
    border-color: #ff6b6b;
    background: rgba(255, 107, 107, 0.1);
}

.category-badge[data-category="Training"] {
    color: #ffd93d;
    border-color: #ffd93d;
    background: rgba(255, 217, 61, 0.1);
}

.category-badge[data-category="Datasets"] {
    color: #6bcb77;
    border-color: #6bcb77;
    background: rgba(107, 203, 119, 0.1);
}

.category-badge[data-category="Tools"] {
    color: #4d96ff;
    border-color: #4d96ff;
    background: rgba(77, 150, 255, 0.1);
}

.category-badge[data-category="Concepts"] {
    color: #c084fc;
    border-color: #c084fc;
    background: rgba(192, 132, 252, 0.1);
}

.category-badge[data-category="Security"] {
    color: #ff922b;
    border-color: #ff922b;
    background: rgba(255, 146, 43, 0.1);
}

.article-date {
    font-family: 'Space Mono', monospace;
    font-size: 0.7rem;
    color: var(--text-dim);
}

.article-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    line-height: 1.4;
}

.article-card .summary {
    color: var(--text-dim);
    font-size: 0.9rem;
    margin-bottom: 20px;
    flex-grow: 1;
}

.article-card .tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.tag {
    font-family: 'Space Mono', monospace;
    font-size: 0.65rem;
    color: var(--text-dim);
    background: rgba(255, 255, 255, 0.05);
    padding: 3px 8px;
    border-radius: 3px;
    border: 1px solid var(--border-color);
}

.article-card .read-more {
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: bold;
    font-size: 0.85rem;
    transition: letter-spacing 0.3s;
}

.article-card .read-more:hover {
    letter-spacing: 1px;
}

.loading-text {
    font-family: 'Space Mono', monospace;
    color: var(--text-dim);
    font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 900px) {
    .articles-grid {
        grid-template-columns: 1fr;
    }
}