/* =====================================================
   KNOWLEDGE & INSIGHTS PAGE
   ===================================================== */

/* Articles grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.article-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-base);
}

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

.article-card__image {
  height: 200px;
  overflow: hidden;
  background: var(--color-primary);
}

.article-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.article-card:hover .article-card__image img {
  transform: scale(1.05);
}

.article-card__image-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
}

/* SVG document icon — replaces emoji placeholder */
.article-card__image-placeholder::after {
  content: '';
  display: block;
  width: 48px;
  height: 48px;
  opacity: 0.55;
  background-color: var(--color-white);
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z'/%3E%3Cpolyline points='14 2 14 8 20 8'/%3E%3Cline x1='16' y1='13' x2='8' y2='13'/%3E%3Cline x1='16' y1='17' x2='8' y2='17'/%3E%3Cpolyline points='10 9 9 9 8 9'/%3E%3C/svg%3E");
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z'/%3E%3Cpolyline points='14 2 14 8 20 8'/%3E%3Cline x1='16' y1='13' x2='8' y2='13'/%3E%3Cline x1='16' y1='17' x2='8' y2='17'/%3E%3Cpolyline points='10 9 9 9 8 9'/%3E%3C/svg%3E");
  -webkit-mask-size: contain;
  mask-size: contain;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-position: center;
  mask-position: center;
}

.article-card__body {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  flex: 1;
}

.article-card__category {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
  display: block;
}

.article-card h3 {
  font-size: var(--text-xl);
  color: var(--color-primary);
  margin-bottom: var(--space-3);
  line-height: 1.3;
}

.article-card h3 a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.article-card h3 a:hover { color: var(--color-accent); }

.article-card__excerpt {
  font-size: var(--text-sm);
  color: var(--color-grey-700);
  line-height: 1.7;
  flex: 1;
  margin-bottom: var(--space-4);
}

.article-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: var(--color-grey-500);
  border-top: 1px solid var(--color-grey-100);
  padding-top: var(--space-4);
  margin-top: auto;
}

.article-card__read-time {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* Category filter tabs */
.article-filters {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-bottom: var(--space-8);
}

.article-filter-btn {
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  border: 2px solid var(--color-grey-300);
  background: transparent;
  color: var(--color-grey-700);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-base);
}

.article-filter-btn:hover,
.article-filter-btn.is-active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

/* Featured article */
.featured-article {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-8);
  background: var(--color-white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  margin-bottom: var(--space-10);
}

.featured-article__image {
  min-height: 360px;
  overflow: hidden;
  background: var(--color-primary);
}

.featured-article__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.featured-article__body {
  padding: var(--space-10) var(--space-8) var(--space-10) 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.featured-article__tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.tag-featured {
  background: var(--color-accent);
  color: var(--color-primary);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

@media (max-width: 1024px) {
  .articles-grid { grid-template-columns: repeat(2, 1fr); }
  .featured-article { grid-template-columns: 1fr; }
  .featured-article__body { padding: var(--space-8); }
}

@media (max-width: 768px) {
  .articles-grid { grid-template-columns: 1fr; }
}