body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0f172a;
  color: #e5e7eb;
  padding: 20px;
}

.app {
  max-width: 900px;
  margin: auto;
  background: #111827;
  padding: 20px;
  border-radius: 10px;
}

header h1 {
  margin: 0 0 10px 0;
}

.controls {
  display: flex;
  gap: 10px;
  margin-bottom: 15px;
}

.controls input, .controls select, .controls button {
  padding: 8px;
  border-radius: 6px;
  border: 1px solid #333;
  background: #1f2937;
  color: #e5e7eb;
}

.list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 12px;
}

.card {
  background: #1f2937;
  padding: 12px;
  border-radius: 8px;
  border: 1px solid #333;
}

.card h3 {
  margin: 0 0 6px 0;
}

.category {
  display: inline-block;
  background: #2563eb;
  color: white;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 12px;
}

.empty {
  text-align: center;
  padding: 20px;
  background: #374151;
  border-radius: 8px;
}