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

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(135deg, #4f46e5, #06b6d4);
  display: flex;
  align-items: center;
  justify-content: center;
}

.container {
  background: #ffffff;
  padding: 25px;
  border-radius: 12px;
  width: 90%;
  max-width: 400px;
  text-align: center;
  box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

h1 {
  margin-bottom: 10px;
  color: #111827;
}

p {
  color: #6b7280;
  font-size: 14px;
}

input {
  width: 100%;
  padding: 12px;
  margin: 15px 0;
  border-radius: 8px;
  border: 1px solid #d1d5db;
  font-size: 15px;
}

button {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 8px;
  background: #4f46e5;
  color: white;
  font-size: 16px;
  cursor: pointer;
}

button:hover {
  background: #4338ca;
}

#result {
  margin-top: 15px;
  color: green;
  font-size: 14px;
}