body {
  font-family: 'Segoe UI', sans-serif;
  background: #f0f4f8;
  margin: 0;
}

.container {
  max-width: 600px;
  margin: 30px auto;
  padding: 25px;
  background: white;
  border-radius: 10px;
  box-shadow: 0 0 25px rgba(0,0,0,0.05);
}

h2, h3 {
  color: #2e6aa3;
}

label {
  display: block;
  margin-top: 15px;
  font-weight: 500;
}

input {
  width: 100%;
  padding: 10px;
  margin-top: 5px;
  border-radius: 6px;
  border: 1px solid #ccc;
  font-size: 1rem;
}

button {
  margin-top: 20px;
  width: 100%;
  padding: 12px;
  background-color: #2e6aa3;
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  cursor: pointer;
}

button:hover {
  background-color: #1c4d76;
}

.result {
  margin-top: 30px;
  padding-top: 10px;
  border-top: 1px solid #ccc;
  font-size: 1.1rem;
  text-align: center;
}

.tip {
  color: #2e6aa3;
  margin-top: 12px;
  font-weight: 600;
}