/* ==========================================
   REFERENZEN PAGE
   ========================================== */

/* Filter Groups */
.filter-group {
  margin-bottom: var(--spacing-lg);
}

.filter-label {
  text-align: center;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-light);
  letter-spacing: 0.05em;
  opacity: 0.8;
}

/* Filter Bar */
.referenzen-filter {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
  padding: 0 var(--spacing-sm);
}

.referenzen-filter .btn {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 0.875rem;
}

/* Active state override for filter buttons */
.referenzen-filter .btn.active {
  background: var(--color-text-light);
  color: var(--color-bg-dark);
  border-color: var(--color-text-light);
}

.referenzen-filter .btn.active:hover {
  background: var(--color-text-light);
  opacity: 0.9;
}

/* Project Grid (Masonry Layout) */
.referenzen-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

@media (min-width: 768px) {
  .referenzen-grid {
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  }
}

@media (min-width: 1024px) {
  .referenzen-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Project Card Overrides for Referenzen */
.referenzen-grid .project-card {
  background: var(--color-bg-elevated);
  display: flex;
  flex-direction: column;
  animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.referenzen-grid .project-card:hover {
  transform: translateY(-8px);
}

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

/* Project Card Image */
.project-card-image {
  width: 100%;
  height: 250px;
  object-fit: cover;
  transition: transform 0.3s ease, opacity 0.4s ease;
  opacity: 0;
}

/* Smooth fade-in when image loads */
.project-card-image.loaded {
  opacity: 1;
}

/* Priority images fade in faster */
.project-card-image.priority-load {
  opacity: 1;
}

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

.project-card-image-wrapper {
  overflow: hidden;
  position: relative;
  background: var(--color-bg-alt);
  /* Skeleton loading effect */
  background: linear-gradient(
    90deg,
    var(--color-bg-alt) 0%,
    var(--color-bg-elevated) 50%,
    var(--color-bg-alt) 100%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
}

/* Stop shimmer when image is loaded */
.project-card-image-wrapper:has(.project-card-image.loaded) {
  animation: none;
  background: var(--color-bg-alt);
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

/* Project Card Content */
.project-card-content {
  padding: var(--spacing-md);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.project-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-light);
}

.project-card-meta {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  flex-wrap: wrap;
}

.project-card-date {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.project-card-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.project-tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--color-bg-elevated-2);
  color: var(--color-text-light);
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 500;
  border: 1px solid var(--color-border-subtle);
}

.project-card-description {
  font-size: 0.95rem;
  color: var(--color-text-muted-light);
  line-height: 1.6;
  margin-bottom: var(--spacing-sm);
  flex: 1;
}

.project-card-services {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: auto;
  padding-top: var(--spacing-sm);
  border-top: 1px solid var(--color-border-subtle);
}

.service-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.75rem;
  background: var(--color-bg-elevated-3);
  color: var(--color-text-light);
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 500;
  border: 1px solid var(--color-border-light);
}

.service-badge svg {
  width: 14px;
  height: 14px;
}

/* Project Card Action Button */
.project-card-action {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.875rem;
  transition: all var(--transition-base);
}

.project-card-more {
  transition: all var(--transition-base);
}

.project-card-arrow {
  transition: transform var(--transition-base);
}

.project-card:hover .project-card-action {
  color: var(--color-text-light);
}

.project-card:hover .project-card-arrow {
  transform: translateX(4px);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
}

.empty-state p {
  font-size: 1.125rem;
  color: var(--color-text-muted);
}

/* Loading Placeholder */
.loading-placeholder {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
}

.loading-placeholder p {
  font-size: 1.125rem;
  color: var(--color-text-muted);
}

/* Responsive Adjustments */
@media (max-width: 768px) {
  .referenzen-section {
    padding: var(--spacing-lg) 0;
  }

  .filter-group {
    margin-bottom: var(--spacing-md);
  }

  .filter-label {
    font-size: 0.875rem;
  }

  .referenzen-filter {
    gap: 0.5rem;
  }

  .referenzen-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .project-card-image {
    height: 200px;
  }
}