/* ============================================================
   CiCC Platform v4.0.0 — ARCHIVE CASE STUDY (VIP PRO)
   ============================================================ */

.cs-archive {
  --cs-accent: #dc2626;
  --cs-grad: linear-gradient(135deg, #dc2626 0%, #b91c1c 50%, #7f1d1d 100%);
}

.page-header { background: var(--cs-grad); }
.page-header .section-tag { background: rgba(255,255,255,.15); color: #fff; }
.page-header h1 { color: #fff; text-shadow: 0 4px 14px rgba(0,0,0,.45); }
.page-header p { color: rgba(255,255,255,.85); }

/* Filter bar */
.archive-filters .filter-group { margin-bottom: 20px; }
.archive-filters .filter-group label {
  font-weight: 700; color: var(--text-primary); margin-bottom: 8px;
  display: block; text-align: center; font-size: 13px;
}
.filter-chips { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.filter-chips .chip {
  padding: 8px 20px; border-radius: 9999px; border: 1px solid var(--border-color);
  background: var(--bg-card); color: var(--text-secondary); font-weight: 600; font-size: 14px;
  cursor: pointer; transition: all .25s ease; backdrop-filter: blur(8px);
}
.filter-chips .chip:hover { border-color: var(--cs-accent); color: var(--cs-accent); }
.filter-chips .chip.active { background: var(--cs-grad); color: #fff; border-color: transparent; }

/* Case grid */
.cs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}
.cs-card {
  display: flex; flex-direction: column; height: 100%;
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: 18px; overflow: hidden;
  transition: transform .3s cubic-bezier(.2,.8,.2,1), box-shadow .3s ease, border-color .3s;
}
.cs-card:hover { transform: translateY(-8px); box-shadow: 0 30px 60px -20px rgba(220,38,38,.45); border-color: transparent; }
.cs-thumb { display: block; overflow: hidden; aspect-ratio: 16/10; }
.cs-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.cs-card:hover .cs-thumb img { transform: scale(1.06); }
.cs-industry {
  padding: 8px 14px; border-radius: 9999px; font-size: 12px; font-weight: 700;
  margin: 16px 20px 8px; background: var(--bg-card); color: var(--cs-accent);
}
.cs-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.cs-body h3 { font-size: 19px; font-weight: 700; margin: 0 0 10px; line-height: 1.3; }
.cs-body h3 a { color: var(--text-primary); text-decoration: none; }
.cs-body h3 a:hover { color: var(--cs-accent); }
.cs-body p { color: var(--text-secondary); font-size: 14px; line-height: 1.6; margin: 0 0 16px; flex: 1; }
.cs-meta { display: flex; gap: 16px; font-size: 13px; color: var(--text-secondary); flex-wrap: wrap; }
.cs-meta span { display: inline-flex; align-items: center; }
.btn-link {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--cs-accent); font-weight: 600; text-decoration: none;
  margin-top: auto; padding: 20px;
}
.btn-link:hover { gap: 12px; }

/* Responsive */
@media (max-width: 768px) { .cs-grid { grid-template-columns: 1fr; } }
@media (prefers-reduced-motion: reduce) {
  .cs-card { transition: none !important; }
  .cs-thumb img { transition: none; }
  .cs-card:hover { transform: none; }
}