/* ============================================================
   SMART WEB DESIGN — Portfolio Page
   ============================================================ */

/* Filter tabs */
.portfolio-filters {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-12);
}

.filter-btn {
  padding: 0.5rem 1.25rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--ease-base);
}
.filter-btn:hover {
  border-color: var(--color-border-accent);
  color: var(--color-accent);
}
.filter-btn.active {
  background: var(--gradient-accent);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 4px 20px rgba(0,212,255,0.25);
}

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

.portfolio-item {
  transition: opacity 0.35s ease, transform 0.35s ease;
}
.portfolio-item.hidden {
  opacity: 0;
  pointer-events: none;
  transform: scale(0.96);
}
.portfolio-item.visible {
  opacity: 1;
  pointer-events: all;
  transform: scale(1);
}

/* Portfolio card enhanced */
.portfolio-card {
  cursor: pointer;
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 4/3;
  border: 1px solid var(--color-border);
  transition: border-color var(--ease-base), box-shadow var(--ease-smooth), transform var(--ease-smooth);
  display: block;
}

.portfolio-card:hover {
  border-color: var(--color-border-accent);
  box-shadow: var(--shadow-lg), var(--shadow-accent);
  transform: translateY(-4px);
}

.portfolio-card__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.portfolio-card:hover .portfolio-card__img { transform: scale(1.08); }

.portfolio-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(10, 10, 15, 0.97) 0%,
    rgba(10, 10, 15, 0.5) 40%,
    rgba(0, 212, 255, 0.04) 100%
  );
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-6);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--ease-smooth), transform var(--ease-smooth);
}
.portfolio-card:hover .portfolio-card__overlay {
  opacity: 1;
  transform: translateY(0);
}

.portfolio-card__category {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

.portfolio-card__title {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
  line-height: 1.3;
}

.portfolio-card__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-accent);
}
.portfolio-card__cta i { font-size: 1rem; }

/* Empty state */
.portfolio-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--space-20);
  color: var(--color-text-muted);
  display: none;
}
.portfolio-empty.visible { display: block; }
.portfolio-empty i { font-size: 3rem; margin-bottom: var(--space-4); display: block; }

@media (max-width: 1024px) { .portfolio-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 540px)  { .portfolio-grid { grid-template-columns: 1fr; } }