.filter-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
  justify-content: center;
}

.filter-btn {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-primary);
}

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

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 1.5rem;
}

.project-card {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.project-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.project-card.hidden {
  display: none;
}

.project-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.project-title {
  font-size: 1.125rem;
  margin: 0;
  flex: 1;
}

.project-category {
  flex-shrink: 0;
}

.project-description {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  margin-bottom: 1rem;
  flex: 1;
}

.project-details {
  border-top: 1px solid var(--color-border);
  padding-top: 1rem;
  margin-top: auto;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.project-details.collapsed {
  max-height: 0;
  padding-top: 0;
  opacity: 0;
  border-top: none;
}

.project-details p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tech-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
}

.tech-tag.large {
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.875rem;
  font-weight: 500;
}

.expand-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.5rem;
  margin-top: 1rem;
  background-color: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.expand-btn:hover {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-primary);
}

.expand-icon {
  transition: transform var(--transition-fast);
}

.expand-btn[aria-expanded="true"] .expand-icon {
  transform: rotate(180deg);
}

.intro-content {
  text-align: center;
}

.intro-content .lead {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
}

.highlights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.highlight-box {
  padding: 1.5rem;
}

.highlight-box h3 {
  margin-bottom: 1rem;
  font-size: 1.125rem;
}

.highlight-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.highlight-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.875rem;
}

.highlight-list li:last-child {
  border-bottom: none;
}

.highlight-list strong {
  color: var(--color-accent);
  display: block;
  margin-bottom: 0.25rem;
}

.project-detail-content {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 3rem;
}

.project-main h2 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-size: 1.5rem;
}

.project-main h2:first-child {
  margin-top: 0;
}

.project-description {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
}

.project-details {
  line-height: 1.8;
}

.tech-stack-detail {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.project-actions {
  margin-top: 2rem;
}

.project-sidebar {
  position: sticky;
  top: 100px;
  height: fit-content;
}

.sidebar-card {
  padding: 1.5rem;
}

.sidebar-card h3 {
  font-size: 1rem;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
}

.project-meta {
  margin: 0;
}

.project-meta dt {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
}

.project-meta dd {
  margin: 0 0 1rem 0;
  font-size: 0.875rem;
}

.project-meta dd:last-child {
  margin-bottom: 0;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background-color: rgba(63, 185, 80, 0.15);
  color: var(--color-success);
}

.status-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  background-color: currentColor;
  border-radius: 50%;
}

@media (max-width: 968px) {
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .project-detail-content {
    grid-template-columns: 1fr;
  }
  
  .project-sidebar {
    position: static;
    order: -1;
  }
  
  .filter-controls {
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 0.5rem;
    flex-wrap: nowrap;
  }
}