body {
  font-family: sans-serif;
  background: linear-gradient(135deg,#1e3c72,#2a5298);
  margin: 0;
}

.container {
  max-width: 500px;
  margin: 50px auto;
  background: #fff;
  padding: 25px;
  border-radius: 15px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

h2 {
  text-align: center;
}

button {
  padding: 12px;
  width: 100%;
  margin: 5px 0;
  border: none;
  border-radius: 8px;
  background: #2a5298;
  color: white;
  cursor: pointer;
}

button:hover {
  background: #1e3c72;
}

.correct {
  background: #4CAF50 !important;
  animation: bounce 0.5s;
}

.wrong {
  background: #f44336 !important;
  animation: shake 0.5s;
}

@keyframes bounce {
  50% { transform: scale(1.2); }
}

@keyframes shake {
  25% { transform: translateX(-5px); }
  50% { transform: translateX(5px); }
}

input {
  width: 100%;
  padding: 10px;
  margin: 5px 0;
}