body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #f5f5f7;
  color: #333;
  margin: 0;
  padding: 0;
}

.container {
  max-width: 500px;
  margin: 60px auto;
  padding: 30px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  text-align: center;
}

h1 {
  color: #007AFF;
  margin-bottom: 16px;
}

p {
  color: #666;
  margin-bottom: 24px;
  font-size: 14px;
}

#udidForm {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

input {
  padding: 12px 16px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 16px;
  outline: none;
}

input:focus {
  border-color: #007AFF;
}

button {
  padding: 12px;
  background: #007AFF;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  cursor: pointer;
  margin-top: 10px;
}

button:hover {
  background: #0056b3;
}

#result {
  margin-top: 20px;
  font-size: 14px;
  text-align: left;
}