body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

.container {
  max-width: 720px;
  margin: 2rem auto;
  padding: 1rem;
}

h1 {
  text-align: center;
}

form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  align-items: flex-start;
}

label {
  font-weight: 600;
}

input[type="file"] {
  width: 100%;
}

button {
  padding: 0.75rem 1rem;
  font-size: 1rem;
  background-color: #007bff;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:disabled {
  background-color: #9e9e9e;
  cursor: not-allowed;
}

.loading-indicator {
  color: #333;
  margin: 0;
}

.error-message {
  color: #b00020;
  margin: 0;
}