/* ============================================
   portfolio.css — 포트폴리오 페이지
   ============================================ */

/* ── 필터 ── */
.portfolio-filter {
  padding-block: var(--space-10) var(--space-6);
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.filter-btn {
  padding: var(--space-2) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 500;
  border: 1px solid var(--color-border);
  border-radius: 100px;
  color: var(--color-text-muted);
  background-color: var(--color-white);
  transition: all var(--transition-fast);
  letter-spacing: 0.02em;
}

.filter-btn:hover {
  border-color: var(--color-secondary);
  color: var(--color-secondary);
}

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

/* ── 그리드 ── */
.portfolio-grid {
  padding-block: var(--space-6) var(--space-24);
}

.portfolio-masonry {
  column-count: 3;
  column-gap: var(--space-4);
}

.portfolio-card {
  break-inside: avoid;
  margin-bottom: var(--space-4);
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.portfolio-card img {
  width: 100%;
  display: block;
  transition: transform var(--transition-slow);
}

.portfolio-card:hover img {
  transform: scale(1.05);
}

.portfolio-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 55%);
  opacity: 0;
  transition: opacity var(--transition-base);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-5);
}

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

.portfolio-card__category {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}

.portfolio-card__title {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  color: var(--color-white);
  font-weight: 600;
}

.portfolio-card__zoom {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: rgba(255,255,255,0.15);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  opacity: 0;
  transition: opacity var(--transition-base);
}

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

/* 필터 애니메이션 */
.portfolio-card.is-hidden {
  display: none;
}

.portfolio-card.is-visible {
  animation: cardFadeIn 0.4s ease both;
}

@keyframes cardFadeIn {
  from { opacity: 0; transform: scale(0.97); }
  to   { opacity: 1; transform: scale(1); }
}

/* 반응형 */
@media (max-width: 1023px) {
  .portfolio-masonry { column-count: 2; }
}

@media (max-width: 767px) {
  .portfolio-masonry { column-count: 1; }
  .portfolio-filter { gap: var(--space-2); }
  .filter-btn { font-size: var(--text-xs); padding: var(--space-2) var(--space-4); }
}