* {
  box-sizing: border-box;
  font-family: Arial, Helvetica, sans-serif;
}

body {
  margin: 0;
  background: linear-gradient(135deg, #1e90ff, #6a5acd);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.container {
  background: white;
  padding: 24px;
  border-radius: 12px;
  text-align: center;
  width: 90%;
  max-width: 420px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

h1 {
  margin-top: 0;
  margin-bottom: 10px;
}

p {
  margin: 8px 0;
  color: #333;
}

button {
  margin-top: 16px;
  padding: 12px 20px;
  font-size: 16px;
  border: none;
  border-radius: 10px;
  background: #1e90ff;
  color: white;
  cursor: pointer;
}

button:active {
  transform: scale(0.98);
}

#result {
  margin-top: 12px;
  font-weight: bold;
  color: #333;
}