:root {
  --fg: #1f2937;
  --bg: #f7f7f4;
  --accent: #b45309;
  --muted: #6b7280;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
}

header, main, footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem;
}

header h1 {
  margin: 0;
  color: var(--accent);
}

.tagline {
  color: var(--muted);
  margin-top: 0.25rem;
}

section + section {
  margin-top: 2rem;
}

ul#book-list {
  list-style: none;
  padding: 0;
}

ul#book-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid #e5e7eb;
}

form label {
  display: block;
  margin-bottom: 0.5rem;
}

form input {
  display: block;
  margin-top: 0.25rem;
  padding: 0.5rem;
  font-size: 1rem;
  width: 100%;
  max-width: 240px;
}

form button {
  margin-top: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

pre#order-result {
  background: #fff;
  border: 1px solid #e5e7eb;
  padding: 1rem;
  white-space: pre-wrap;
  min-height: 1.5rem;
}

footer {
  color: var(--muted);
  text-align: center;
  margin-top: 3rem;
}