body {
  font-family: Arial, sans-serif;
  background: linear-gradient(135deg, #f3f9f4, #d6f5e3);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

.container {
  background: white;
  padding: 30px;
  border-radius: 16px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.15);
  max-width: 450px;
  text-align: center;
}

h1 {
  color: #2d6a4f;
  margin-bottom: 10px;
}

p {
  font-size: 14px;
  color: #444;
}

.input-section {
  margin: 15px 0;
}

input {
  padding: 10px;
  width: 65%;
  border: 1px solid #ccc;
  border-radius: 8px;
  font-size: 14px;
  outline: none;
}

button {
  padding: 10px 15px;
  margin-left: 8px;
  background: #2d6a4f;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s ease-in-out;
}

button:hover {
  background: #1b4332;
}

.output-box {
  margin-top: 20px;
  padding: 15px;
  border-radius: 12px;
  background: #f8fdfb;
  font-size: 15px;
  color: #333;
  border: 1px solid #ddd;
}