* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  background: radial-gradient(circle at top, #2b235a, #090814 65%);
  color: #f5f5f5;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.card {
  width: 100%;
  max-width: 520px;
  background: rgba(15, 15, 30, 0.88);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 24px;
  padding: 2.5rem;
  text-align: center;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.45);
}

h1 {
  margin-top: 0;
  font-size: 2.5rem;
  letter-spacing: 0.04em;
}

form {
  display: flex;
  gap: 0.75rem;
  margin-top: 2rem;
}

input {
  flex: 1;
  padding: 0.9rem 1rem;
  border-radius: 999px;
  border: none;
  font-size: 1rem;
  outline: none;
}

button {
  padding: 0.9rem 1.2rem;
  border-radius: 999px;
  border: none;
  font-weight: bold;
  cursor: pointer;
  background: #8f7cff;
  color: white;
}

button:hover {
  background: #a99bff;
}

.answer {
  margin-top: 2rem;
  padding: 1.5rem;
  border-radius: 18px;
  background: rgba(143, 124, 255, 0.16);
  border: 1px solid rgba(143, 124, 255, 0.35);
}

.answer p {
  margin: 0;
  font-size: 1.35rem;
  font-weight: bold;
}

@media (max-width: 600px) {
  .card {
    padding: 1.5rem;
  }

  form {
    flex-direction: column;
  }

  button {
    width: 100%;
  }
}