/**
 * Portfolio Section - Grid Structure Only
 * Colors are defined in colors.css
 */

.portfolio-section {
  padding: var(--space-20) 0;
}

.portfolio-filter {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-12);
}

.filter-btn {
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-lg);
  border: 2px solid transparent;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  cursor: pointer;
  transition: all var(--transition-base);
  background: transparent;
  min-height: 44px; /* Touch-friendly - WCAG 2.1 Level AAA */
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

@media (max-width: 768px) {
  .filter-btn {
    min-height: 48px; /* Larger touch targets on mobile */
  }
}

.portfolio-grid {
  display: grid;
  gap: var(--space-8);
  margin-top: var(--space-8);
}

.portfolio-grid-2 {
  grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
}

.portfolio-grid-3 {
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}

.portfolio-grid-4 {
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.portfolio-card {
  position: relative;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08), 0 1px 3px rgba(0, 0, 0, 0.12);
  overflow: hidden;
  transition: all var(--transition-base);
}

.portfolio-card-image {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--surface-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
}

.portfolio-card-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: var(--space-4);
  transition: transform var(--transition-base);
}

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

.portfolio-card-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
}

.portfolio-card-category {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.portfolio-card-content {
  padding: var(--space-6);
}

.portfolio-card-title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-2);
}

.portfolio-card-description {
  font-size: var(--text-sm);
  line-height: 1.6;
  opacity: 0.8;
}

.portfolio-card-link {
  text-decoration: none;
  display: block;
  height: 100%;
  color: inherit;
}

.portfolio-card-badge {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid transparent;
}

.portfolio-card-tags {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-top: var(--space-3);
}

.portfolio-card-tags .tag {
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border: 1px solid transparent;
}

@media (max-width: 768px) {
  .portfolio-grid-2,
  .portfolio-grid-3,
  .portfolio-grid-4 {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}