/* ═══════════════════════════════════════════════════════════
   assets/css/pages/cases.css — 案例页 v2
   ═══════════════════════════════════════════════════════════ */

/* ── 筛选栏 ── */
.filter-bar {
  display: flex; flex-direction: column; gap: 1rem;
  margin-bottom: 2.5rem;
  padding: 1.5rem;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  border: var(--border-thin);
  box-shadow: var(--shadow-sm);
  position: sticky; top: 84px; z-index: var(--z-raised);
}
.filter-group { display: flex; align-items: flex-start; gap: 0.5rem; flex-wrap: wrap; }
.filter-label { font-size: 0.875rem; font-weight: var(--fw-semibold); color: var(--color-text-secondary); min-width: 3em; white-space: nowrap; padding-top: 0.625rem; }

/* ── 案例网格 ── */
.cases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.case-card {
  border-radius: var(--radius-md); overflow: hidden;
  background: var(--color-white); border: var(--border-thin);
  transition: all var(--transition-base);
}
.case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card-hover); border-color: var(--color-primary-200); }
.case-card.hidden { display: none; }
.case-card-link { color: inherit; display: block; text-decoration: none; }
.case-card-image { overflow: hidden; position: relative; }
.case-card-image img {
  width: 100%; aspect-ratio: 16/10; object-fit: cover;
  transition: transform var(--transition-slower);
}
.case-card:hover .case-card-image img { transform: scale(1.06); }
.case-card-image::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(15,23,42,0.25) 0%, transparent 50%);
  opacity: 0; transition: opacity var(--transition-base);
}
.case-card:hover .case-card-image::after { opacity: 1; }
.case-card-body { padding: 1.25rem; }
.case-year { font-size: var(--text-xs); color: var(--color-text-placeholder); font-weight: var(--fw-medium); }
.case-card-body h3 { font-size: 1.0625rem; margin-top: 0.25rem; line-height: var(--lh-snug); }

/* ── 案例详情页 ── */
.case-detail-hero-wrapper {
  position: relative; width: 100%; max-height: 480px;
  overflow: hidden;
  border-bottom: 4px solid var(--color-primary);
}
.case-detail-hero {
  width: 100%; max-height: 480px; object-fit: cover;
  display: block;
  aspect-ratio: 2/1;
  background: var(--color-surface-alt);
}
.case-detail-hero-overlay {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 3rem 2rem 2rem;
  background: linear-gradient(to top, rgba(15,23,42,0.75) 0%, transparent 100%);
  color: #fff; text-align: center;
}
.case-detail-hero-title {
  font-size: 2rem; color: #fff;
  margin-bottom: 1rem;
  text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}
.case-detail-content { max-width: var(--container-narrow); margin: 0 auto; }
.case-detail-content h1 { font-size: var(--text-section-title); margin-bottom: 1.25rem; }
.case-detail-meta {
  display: flex; gap: 0.75rem; flex-wrap: wrap;
  margin: 1.5rem 0 2rem;
  padding-bottom: 1.5rem;
  border-bottom: var(--border-thin);
}
.case-detail-body h3 { margin: 2.5rem 0 0.75rem; padding-left: 1rem; border-left: 3px solid var(--color-primary); }
.case-detail-body h3:first-child { margin-top: 0; }
.case-detail-body p { margin-bottom: 1rem; line-height: var(--lh-relaxed); color: var(--color-text-body); }
.case-gallery { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 2rem 0; }
.case-gallery-item {
  position: relative; overflow: hidden;
  border-radius: var(--radius-sm);
}
.case-gallery-item img {
  width: 100%; aspect-ratio: 4/3; object-fit: cover;
  display: block;
  transition: transform var(--transition-base);
}
.case-gallery-item:hover img { transform: scale(1.03); }
.case-gallery-item.full-width { grid-column: 1 / -1; }
.case-gallery-item.full-width img { aspect-ratio: 2/1; }
.gallery-caption {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 0.75rem 1rem;
  background: linear-gradient(to top, rgba(15,23,42,0.7) 0%, transparent 100%);
  color: rgba(255,255,255,0.9);
  font-size: 0.8125rem; font-weight: var(--fw-medium);
}
.case-nav { display: flex; justify-content: space-between; align-items: center; margin: 3rem 0; padding-top: 2rem; border-top: var(--border-thin); }

/* ── 案例KPI卡片 ── */
.case-kpi-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; margin: 2rem 0; }
.case-kpi {
  text-align: center; padding: 1.5rem 1rem;
  background: var(--color-primary-50); border-radius: var(--radius-md);
  border: 1px solid var(--color-primary-100);
}
.case-kpi-number { font-family: var(--font-display); font-size: 1.75rem; font-weight: 800; color: var(--color-primary); line-height: 1; }
.case-kpi-label { font-size: 0.8125rem; color: var(--color-text-muted); margin-top: 0.5rem; }

/* ── 响应式 ── */
@media (max-width: 1024px) { .cases-grid { grid-template-columns: repeat(2, 1fr); } .case-kpi-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 768px) {
  .filter-bar { position: static; padding: 1rem; }
  .filter-group { gap: 0.5rem; }
}
@media (max-width: 640px) {
  .cases-grid { grid-template-columns: 1fr; }
  .filter-bar { padding: 0.875rem; border-radius: var(--radius-md); }
  .filter-label { padding-top: 0.5rem; font-size: 0.8125rem; min-width: auto; }
  .case-detail-hero-wrapper,
  .case-detail-hero { max-height: 240px; }
  .case-detail-hero-overlay { padding: 1.5rem 1rem 1rem; }
  .case-detail-hero-title { font-size: 1.25rem; }
  .case-gallery { grid-template-columns: 1fr; }
  .case-gallery-item.full-width img { aspect-ratio: 4/3; }
  .case-nav { flex-direction: column; gap: 1rem; align-items: stretch; text-align: center; }
}