body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 2rem;
  background: #f1f5f9;
  color: #0f172a;
}
.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 2rem;
  background: #ffffff;
  border-radius: 16px;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
}
h1 {
  margin-bottom: 0.5rem;
}
button {
  background: #2563eb;
  color: white;
  border: none;
  padding: 0.75rem 1.25rem;
  border-radius: 999px;
  cursor: pointer;
  font-size: 1rem;
  transition: background 0.2s ease;
}
button:hover {
  background: #1d4ed8;
}
input,
textarea {
  width: 100%;
  padding: 0.75rem;
  margin-top: 0.5rem;
  margin-bottom: 1rem;
  border: 1px solid #cbd5e1;
  border-radius: 0.75rem;
  font-size: 1rem;
}
.card {
  padding: 1rem;
  border: 1px solid #e2e8f0;
  border-radius: 1rem;
  margin-top: 1rem;
  background: #f8fafc;
}