body {
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(to right, #e3f2fd, #ffffff);
  color: #333;
  margin: 0;
  padding: 0;
}

#logo-section {
  background-color: #1976d2;
  text-align: center;
  padding: 10px;
}

#logo-img {
  width: 100px;
  border-radius: 10px;
}

#reference header {
  background-color: #bbdefb;
  padding: 20px;
  text-align: center;
}

#reference h1 {
  margin: 0;
  color: #0d47a1;
}

#userInput {
  background-color: #ffffff;
  padding: 30px;
  margin: 20px auto;
  width: 90%;
  max-width: 600px;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

#userInput h2 {
  text-align: center;
  color: #33691e;
}

label {
  display: block;
  margin-top: 15px;
  font-weight: bold;
  color: #2e7d32;
}

input[type="number"],
select {
  width: 100%;
  padding: 8px;
  margin-top: 5px;
  border: 1px solid #ccc;
  border-radius: 8px;
  background-color: #fffde7;
}

button {
  margin-top: 20px;
  padding: 10px 20px;
  background-color: #4caf50;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  display: block;
  width: 100%;
  font-size: 16px;
  transition: background-color 0.3s;
}

button:hover {
  background-color: #388e3c;
}