#portfolio {
  background: var(--clr-white);
  position: relative;
}

.portfolio-filters {
  display: flex;
  justify-content: center;
  gap: var(--sp-2);
  flex-wrap: wrap;
  margin-bottom: var(--sp-10);
}

.filter-btn {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--clr-text-3);
  padding: var(--sp-2) var(--sp-5);
  border-radius: var(--radius-full);
  border: 1.5px solid var(--clr-border);
  background: transparent;
  transition: all var(--tr-normal);
  cursor: pointer;
}

.filter-btn:hover {
  color: var(--clr-primary);
  border-color: rgba(26, 86, 184, 0.3);
  background: rgba(26, 86, 184, 0.05);
}

.filter-btn.active {
  background: var(--grad-brand);
  color: var(--clr-white);
  border-color: transparent;
  box-shadow: 0 4px 15px rgba(26, 86, 184, 0.3);
}

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

.portfolio-card {
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  transition: transform var(--tr-spring),
              box-shadow var(--tr-normal),
              opacity 0.4s ease;
}

.portfolio-card.is-hidden {
  display: none;
}

.portfolio-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.portfolio-img {
  width: 100%;
  aspect-ratio: 16 / 10;
  background: var(--clr-border);
  position: relative;
  overflow: hidden;
}

.portfolio-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--tr-spring);
}

.portfolio-card:hover .portfolio-img img {
  transform: scale(1.08);
}

.portfolio-img::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 50%, rgba(0,0,0,0.5));
  opacity: 0;
  transition: opacity var(--tr-normal);
}

.portfolio-card:hover .portfolio-img::before {
  opacity: 1;
}

.portfolio-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-3);
  opacity: 0;
  transition: opacity var(--tr-normal);
}

.portfolio-card:hover .portfolio-overlay {
  opacity: 1;
}

.portfolio-overlay-btn {
  width: 44px;
  height: 44px;
  background: rgba(255,255,255,0.95);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  transition: transform var(--tr-spring);
  cursor: pointer;
}

.portfolio-overlay-btn:hover {
  transform: scale(1.15);
}

.portfolio-img--web {
  background: linear-gradient(135deg, #0d2e6e 0%, #2d8cda 100%);
}

.portfolio-img--app {
  background: linear-gradient(135deg, #1a56b8 0%, #4bbf6b 100%);
}

.portfolio-img--design {
  background: linear-gradient(135deg, #4bbf6b 0%, #2d8cda 100%);
}

.portfolio-body {
  padding: var(--sp-5);
}

.portfolio-category {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--clr-primary);
  margin-bottom: var(--sp-2);
}

.portfolio-title {
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--clr-text);
  margin-bottom: var(--sp-2);
  line-height: 1.3;
}

.portfolio-desc {
  font-size: var(--fs-sm);
  color: var(--clr-text-3);
  line-height: 1.7;
  margin-bottom: var(--sp-4);
}

.portfolio-tech {
  display: flex;
  gap: var(--sp-2);
  flex-wrap: wrap;
}

.tech-tag {
  font-size: var(--fs-xs);
  font-weight: 500;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  background: rgba(26, 86, 184, 0.08);
  color: var(--clr-primary);
}

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

@media (max-width: 640px) {
  .portfolio-grid {
    grid-template-columns: 1fr;
  }
}