body {
  margin: 0;
  font-family: system-ui, -apple-system, sans-serif;
  background: #f8f9fb;
  color: #222;
  display: flex;
  justify-content: center;
  align-items: center;
}

.container {
  max-width: 720px;
  width: 100%;
  padding: 40px 20px;
}

.error {
  max-width: 500px;
  text-align: center;
}

h1 {
  margin-bottom: 10px;
  font-size: 2rem;
}

p {
  line-height: 1.6;
  color: #444;
}

h2 {
  margin-top: 28px;
  font-size: 1.2rem;
}

ol {
  padding-left: 20px;
  line-height: 1.7;
}

.box {
  margin-top: 16px;
  padding: 14px 16px;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
}

code {
  display: block;
  margin-top: 8px;
  padding: 10px 12px;
  background: #f1f3f5;
  border-radius: 6px;
  font-family: monospace;
  font-size: 0.9rem;
  overflow-x: auto;
}

.muted {
  color: #666;
}

strong {
  color: #111;
}

a {
  display: inline-block;
  margin-top: 20px;
  color: #0366d6;
  text-decoration: none;
}