body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

header {
  text-align: center;
  margin-bottom: 20px;
}

.tabs {
  display: flex;
  margin-bottom: 20px;
  border-bottom: 1px solid #ddd;
}

.tab-btn {
  background: none;
  border: none;
  padding: 10px 20px;
  cursor: pointer;
  font-size: 16px;
}

.tab-btn.active {
  border-bottom: 3px solid #4e79a7;
  font-weight: bold;
}

#content {
  display: flex;
  flex-wrap: wrap;
}

.control-panel {
  width: 300px;
  padding: 20px;
  background-color: #f5f5f5;
  border-radius: 5px;
}

.input-group {
  margin-bottom: 15px;
}

label {
  display: block;
  margin-bottom: 5px;
}

button {
  background-color: #4e79a7;
  color: white;
  border: none;
  padding: 10px 15px;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background-color: #3a5a80;
}

hr {
  margin: 20px 0;
  border: none;
  border-top: 1px solid #ddd;
}