body {
  font-family: Arial, sans-serif;
  background-color: #f9f9f9;
  color: #333;
  margin: 0;
  padding: 0;
}

header {
  text-align: center;
  background-color: white;
  padding: 20px 10px;
  border-bottom: 1px solid #ccc;
}

header img {
  max-height: 100px;
}

.container {
  padding: 20px;
  max-width: 900px;
  margin: auto;
}

h1, h2 {
  color: #222;
  margin-top: 20px;
}

textarea {
  width: 100%;
  height: 150px;
  margin-bottom: 20px;
  padding: 10px;
  font-size: 1em;
  border: 1px solid #ccc;
  border-radius: 4px;
}

input[type="number"] {
  width: 80px;
  margin: 5px;
}

button {
  padding: 10px 20px;
  margin: 10px 5px;
  font-size: 1em;
  cursor: pointer;
  border-radius: 4px;
  border: none;
  background-color: #007bff;
  color: white;
}

button:hover {
  background-color: #0056b3;
}

#result {
  white-space: pre-wrap;
  background-color: #fff;
  border: 1px solid #ddd;
  padding: 15px;
  margin-top: 20px;
  border-radius: 5px;
}

.stock-group {
  margin: 10px 0;
  background: #fff;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}