body {
  margin: 0;
  font-family: Arial;
  background: linear-gradient(135deg, #0f172a, #1e3a8a);
  min-height: 100vh;
}

.container {
  display: flex;
  justify-content: center;
  padding-top: 80px;
}

.card {
  width: 420px;
  background: white;
  border-radius: 16px;
  padding: 30px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.2);
}

.hidden {
  display: none;
}

input {
  width: 100%;
  margin: 10px 0;
  padding: 12px;
  box-sizing: border-box;
  border: 1px solid #ccc;
  border-radius: 8px;
}

button {
  width: 100%;
  padding: 12px;
  margin-top: 10px;
  background: #2563eb;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

button:hover {
  opacity: 0.9;
}

pre {
  background: #f5f5f5;
  padding: 15px;
  border-radius: 8px;
  white-space: pre-wrap;
}