/* css/projects.css */
.projects-filter {
  display: flex;
  gap: var(--space-32);
  margin-bottom: var(--space-64);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-24);
}

.filter-btn {
  background: none;
  border: none;
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-muted);
  cursor: pointer;
  padding: 0;
  padding-bottom: var(--space-4);
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}
.filter-btn:hover { color: var(--color-navy); }
.filter-btn.active { color: var(--color-navy); border-bottom-color: var(--color-navy); }

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-24);
}

.project-item {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  border: 1px solid rgba(13, 43, 85, 0.1);
  border-radius: 8px;
  background: var(--color-white);
  box-shadow: 0 16px 34px rgba(13, 43, 85, 0.08);
  isolation: isolate;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}
.project-item[hidden] { display: none; }
.project-item:hover {
  transform: translateY(-4px);
  border-color: rgba(13, 43, 85, 0.22);
  box-shadow: 0 22px 46px rgba(13, 43, 85, 0.13);
}

.project-item img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
  filter: saturate(0.95) contrast(0.98);
  transition: transform 500ms cubic-bezier(0.22, 1, 0.36, 1), filter var(--transition-slow);
}
.project-item:hover img {
  transform: scale(1.04);
  filter: saturate(1.08) contrast(1.02);
}

.project-item__overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to top, rgba(13, 43, 85, 0.82) 0%, rgba(13, 43, 85, 0.22) 46%, transparent 74%);
  opacity: 1;
  display: flex;
  align-items: flex-end;
  padding: var(--space-24);
  transform: translateY(0);
  transition: background var(--transition-base), transform var(--transition-base);
}
.project-item:hover .project-item__overlay {
  background:
    linear-gradient(to top, rgba(13, 43, 85, 0.9) 0%, rgba(13, 43, 85, 0.18) 50%, transparent 78%);
}

.project-item__label {
  color: var(--color-white);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}

/* Lightbox */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.92);
  z-index: 200;
  align-items: center;
  justify-content: center;
  padding: var(--space-32);
}
.lightbox.open { display: flex; }

.lightbox__img {
  max-width: 90vw;
  max-height: 85vh;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 28px 70px rgba(0,0,0,0.42);
}

.lightbox__close {
  position: absolute;
  top: var(--space-24);
  right: var(--space-32);
  background: none;
  border: none;
  color: rgba(255,255,255,0.7);
  font-size: var(--text-xl);
  cursor: pointer;
  line-height: 1;
  transition: color var(--transition-fast);
}
.lightbox__close:hover { color: var(--color-white); }

@media (max-width: 768px) {
  .projects-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-16);
  }
  .projects-filter {
    gap: var(--space-16);
    flex-wrap: wrap;
    margin-bottom: var(--space-48);
  }
  .filter-btn {
    min-height: 36px;
    padding-bottom: var(--space-8);
  }
  .project-item__overlay { padding: var(--space-16); }
}
@media (max-width: 480px) {
  .projects-grid { grid-template-columns: 1fr; }
  .project-item img { aspect-ratio: 4 / 3; }
}