* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: Arial, sans-serif;
  background: #f4f6f8;
  color: #222;
}

.container {
  max-width: 700px;
  margin: 80px auto;
  background: white;
  padding: 32px;
  border-radius: 12px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.08);
}

h1 {
  margin-bottom: 12px;
}

p {
  margin-bottom: 20px;
  color: #555;
}

button {
  background: #111827;
  color: white;
  border: none;
  padding: 12px 18px;
  border-radius: 8px;
  cursor: pointer;
  margin-bottom: 20px;
}

button:hover {
  opacity: 0.92;
}

.card {
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 16px;
}

pre {
  white-space: pre-wrap;
  word-break: break-word;
}