body {
  font-family: 'Inter', Arial, sans-serif;
  background-color: #f0f3f8;
  margin: 0;
  padding: 0;
}

.container {
  max-width: 1200px;
  margin: 20px auto;
  background: #ffffff;
  padding: 25px;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

header h1 {
  margin: 0 0 15px 0;
  font-size: 1.8em;
  color: #333;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
  align-items: center;
}

.controls select,
.controls button,
.controls input[type="file"] {
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid #ccc;
  font-size: 0.95em;
  cursor: pointer;
}

.controls button {
  background-color: #2196f3;
  color: white;
  border: none;
  transition: background 0.2s;
}

.controls button:hover {
  background-color: #1976d2;
}

.nested-list {
  list-style: none;
  padding-left: 0;
}

.nested-list li {
  padding: 10px;
  margin-bottom: 6px;
  border-radius: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  background-color: #f7f9fc;
  transition: all 0.2s;
}

.nested-list li:hover {
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.nested-list li input[type="text"],
.nested-list li input[type="number"],
.nested-list li input[type="date"] {
  padding: 6px 8px;
  border-radius: 6px;
  border: 1px solid #ccc;
  font-size: 0.95em;
}

.nested-list li button {
  padding: 4px 8px;
  font-size: 0.85em;
  border-radius: 6px;
  border: none;
  cursor: pointer;
}

.nested-list li button:hover {
  opacity: 0.85;
}

.number-label {
  font-weight: bold;
  min-width: 50px;
}

/* Poziomy kolorów */
.level-1 { background-color: #e3f2fd; }
.level-2 { background-color: #bbdefb; }
.level-3 { background-color: #90caf9; }
.level-4 { background-color: #64b5f6; }
.level-5 { background-color: #42a5f5; }
.level-6 { background-color: #2196f3; color: white; }

.dragging { opacity: 0.5; border: 2px dashed #555; }
.drag-over { border: 2px dashed #000; background-color: #cce0ff; }

.hidden-level { display: none !important; }