body {
  font-family: Arial, sans-serif;
  background: #0f172a;
  color: #f1f5f9;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  background: #1e293b;
  padding: 2rem;
  border-radius: 12px;
  width: 320px;
  box-shadow: 0 0 12px rgba(0, 0, 0, 0.3);
  text-align: center;
}

h1 {
  margin-bottom: 1.5rem;
}

.tabs {
  display: flex;
  justify-content: center;
  margin-bottom: 1rem;
}

.tabs button {
  background: none;
  border: none;
  color: #cbd5e1;
  padding: 0.5rem 1rem;
  cursor: pointer;
  font-weight: bold;
}

.tabs button.active {
  border-bottom: 2px solid #38bdf8;
  color: #38bdf8;
}

.form {
  display: none;
  flex-direction: column;
  gap: 0.75rem;
}

.form.active {
  display: flex;
}

input {
  padding: 0.5rem;
  border-radius: 6px;
  border: 1px solid #64748b;
  background: #0f172a;
  color: #f8fafc;
}

button[type="submit"] {
  padding: 0.6rem;
  background: #38bdf8;
  color: #0f172a;
  font-weight: bold;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.3s ease;
}

button[type="submit"]:hover {
  background: #0ea5e9;
}

#response-message {
  margin-top: 1rem;
  font-size: 0.9rem;
  color: #facc15;
}