.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  padding: 2rem;
}

.viz-card {
  display: block;
  background: var(--surface);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  overflow: hidden;
  border: 1px solid #2a2a2a;
  transition: border-color 0.2s, transform 0.2s;
}

.viz-card:hover { border-color: var(--accent); transform: translateY(-2px); }

.card-thumb {
  width: 100%;
  height: 160px;
  background: #111;
}

.seismic-thumb { background: linear-gradient(135deg, #001f3f, #0a3d2e); }

.card-body { padding: 1rem; }
.card-body h2 { font-size: 1.1rem; margin-bottom: 0.25rem; }
.card-body p { font-size: 0.85rem; color: var(--muted); }