/* ===============================================================
   gallery.css — 摄影画廊 + 卡片 3D 翻转效果
   =============================================================== */

/* ── 分类筛选按钮 ── */
.gallery__filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-3xl);
}

.gallery__filter-btn {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  padding: 0.5em 1.2em;
  border: 1px solid transparent;
  transition:
    color var(--duration-fast),
    border-color var(--duration-fast),
    background var(--duration-fast);
  cursor: pointer;
}

.gallery__filter-btn:hover {
  color: var(--gold-light);
  border-color: var(--gold-border);
}

.gallery__filter-btn--active {
  color: var(--gold);
  border-color: var(--gold-border);
  background: var(--gold-dim);
}

.gallery__filter-count {
  font-size: 0.65em;
  opacity: 0.6;
  margin-left: 0.3em;
}

/* ── 画廊网格 ── */
.gallery__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-xl);
}

/* ── 照片卡片 ── */
.photo-card {
  position: relative;
  cursor: pointer;
  transform-style: preserve-3d;
  perspective: 1000px;
  transition: transform 0.1s ease-out;
  /* 会被 JS 动态设置 transform */
}

/* 画框外容器 */
.photo-card__frame {
  position: relative;
  background: var(--paper);
  padding: 12px 12px 48px;
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--duration-base) var(--ease-out);
}

.photo-card:hover .photo-card__frame {
  box-shadow: var(--shadow-hover);
}

/* 图片容器 */
.photo-card__image-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--bg-surface);
}

.photo-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out);
}

.photo-card:hover .photo-card__image {
  transform: scale(1.05);
}

/* 悬停叠加层 */
.photo-card__overlay {
  position: absolute;
  inset: 0;
  background: rgba(23, 19, 12, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--duration-base);
}

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

.photo-card__overlay-icon {
  width: 48px;
  height: 48px;
  border: 1px solid var(--gold-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gold-light);
  font-size: 1.2rem;
}

/* 标题区域 (画框下方) */
.photo-card__info {
  margin-top: 10px;
  text-align: center;
}

.photo-card__title {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-on-paper);
  letter-spacing: 0.03em;
  margin-bottom: 4px;
}

.photo-card__category {
  font-size: 0.68rem;
  letter-spacing: 0.15em;
  color: var(--gold);
}

/* 画框内阴影效果 */
.photo-card__frame::after {
  content: '';
  position: absolute;
  inset: 4px;
  border: 1px solid rgba(168, 133, 61, 0.12);
  pointer-events: none;
}

/* ── 3D 倾斜光泽 (JS 控制) ── */
.photo-card__glare {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 2;
  opacity: 0;
  transition: opacity var(--duration-base);
  background: radial-gradient(
    circle at center,
    rgba(255, 255, 255, 0.15) 0%,
    transparent 60%
  );
}

.photo-card:hover .photo-card__glare {
  opacity: 1;
}

/* ── 空状态 ── */
.gallery__empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--space-4xl) 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  letter-spacing: 0.05em;
}

/* ── 加载状态 ── */
.gallery__loading {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--space-4xl) 0;
  color: var(--text-muted);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
}

/* ── 响应式 ── */
@media (max-width: 768px) {
  .gallery__grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--space-lg);
  }

  .photo-card__frame {
    padding: 8px 8px 36px;
  }

  .gallery__filters {
    gap: 4px;
  }

  .gallery__filter-btn {
    font-size: 0.7rem;
    padding: 0.4em 0.8em;
  }
}

@media (max-width: 480px) {
  .gallery__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }
}