body {
  margin:0;
  font-family:Arial;
  background: linear-gradient(135deg,#1e3c72,#2a5298);
  height:100vh;
  display:flex;
  justify-content:center;
  align-items:center;
}

.container {
  width:100%;
  display:flex;
  justify-content:center;
}

.card {
  background:white;
  padding:30px;
  border-radius:15px;
  width:350px;
  box-shadow:0 10px 30px rgba(0,0,0,0.3);
  animation: fadeIn 1s ease;
}

.card h2 {
  text-align:center;
  margin-bottom:20px;
}

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

button {
  width:100%;
  padding:12px;
  background:#2a5298;
  color:white;
  border:none;
  border-radius:8px;
  cursor:pointer;
  transition:0.3s;
}

button:hover {
  background:#1e3c72;
}

.success {
  width:500px;
}

pre {
  background:#111;
  color:#0f0;
  padding:15px;
  border-radius:10px;
  overflow:auto;
}

@keyframes fadeIn {
  from {opacity:0; transform:scale(0.9);}
  to {opacity:1; transform:scale(1);}
}