.theme-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  width: 100%;
}

.theme-card {
  background: linear-gradient(145deg, #ffffff, #f8f9fa);
  border: 2px solid #e9ecef;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.08), inset 0 1px 0 rgba(255,255,255,0.9);
  overflow: hidden;
}

.theme-card img { width: 100%; display: block; }
.theme-card .info { padding: 12px; color: #0f172a; }
.theme-card h3 { margin: 0 0 6px 0; font-size: 1.1rem; }
.theme-card p { margin: 0 0 10px 0; font-size: 0.9rem; color: #475569; }

.theme-actions { display: flex; gap: 8px; }
.theme-actions .nav-btn { padding: 8px 12px; font-size: 0.9rem; }