body {
  font-family: Arial, sans-serif;
  background: #0f0f22;
  color: #fff;
  margin: 0;
  padding: 0;
}

.container {
  max-width: 500px;
  margin: 50px auto;
  background: #1c1c3c;
  padding: 20px;
  border-radius: 10px;
}

h1 {
  text-align: center;
  margin-bottom: 20px;
}

label {
  font-weight: bold;
  margin-top: 10px;
  display: block;
}

input, select {
  width: 100%;
  padding: 8px;
  margin-top: 4px;
  border-radius: 5px;
  border: none;
}

button {
  width: 100%;
  padding: 10px;
  margin-top: 15px;
  background: #00b7ff;
  border: none;
  border-radius: 5px;
  font-size: 16px;
  cursor: pointer;
}

button:hover {
  background: #0090cc;
}

.result {
  margin-top: 20px;
  font-size: 18px;
}