body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 20px;
  color: #333;
  background-color: #f5f7fa;
}

.app-container {
  max-width: 1200px;
  margin: 0 auto;
}

.controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

.control-group {
  background: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}

.control-row {
  margin-bottom: 15px;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  font-size: 14px;
  color: #555;
}

select, input {
  width: 96%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 6px;
  background-color: white;
  font-size: 14px;
  transition: border-color 0.3s;
}

select:focus, input:focus {
  border-color: #4CAF50;
  outline: none;
}

.item-buttons {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}

button {
  padding: 10px 16px;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 8px;
}

button:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

button i {
  font-size: 14px;
}

#addItem {
  background-color: #4CAF50;
}

#removeItem {
  background-color: #f44336;
}

.preview {
  margin-bottom: 30px;
  background-color: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}

.flex-container {
  display: flex;
  border: 2px dashed #a0a0a0;
  padding: 20px;
  min-height: 200px;
  background-color: #f9f9f9;
  margin-bottom: 20px;
  overflow: hidden;
  flex-wrap: wrap;
  border-radius: 6px;
}

.flex-item {
  padding: 15px;
  margin: 10px;
  background-color: #4CAF50;
  color: white;
  text-align: center;
  min-width: 60px;
  max-width: 100%;
  flex: 1 1 100px;
  box-sizing: border-box;
  border-radius: 4px;
  transition: all 0.3s ease;
  font-size: 14px;
  word-break: break-word;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.output {
  background: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}

.code-tabs {
  display: flex;
  gap: 5px;
  margin-bottom: 15px;
  border-bottom: 1px solid #eee;
  padding-bottom: 5px;
}

.tab-button {
  padding: 8px 16px;
  background: none;
  color: #666;
  border: none;
  border-radius: 4px;
  font-weight: 600;
}

.tab-button:hover {
  background: #f0f0f0;
  color: #333;
}

.tab-button.active {
  background: #4CAF50;
  color: white;
}

.code-content {
  position: relative;
}

.code-tab {
  display: none;
}

.code-tab.active {
  display: block;
}

.code-header {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 10px;
}

.copy-button {
  padding: 6px 12px;
  background-color: #2196F3;
  font-size: 13px;
}

.code-container {
  background: #2d2d2d;
  color: #f8f8f2;
  padding: 15px;
  border-radius: 6px;
  overflow-x: auto;
}

pre {
  margin: 0;
  white-space: pre-wrap;
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.5;
  tab-size: 4;
}

@keyframes itemAdded {
  from { transform: scale(0.8); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.flex-item.added {
  animation: itemAdded 0.3s ease-out;
}

@media (max-width: 768px) {
  .controls {
      grid-template-columns: 1fr;
  }
  
  .flex-item {
      padding: 10px;
      margin: 6px;
      min-width: 50px;
      flex-basis: 80px;
  }
  
  .code-tabs {
      overflow-x: auto;
      padding-bottom: 10px;
  }
}