:root {
  color-scheme: light;
}

html, body {
  margin: 0;
  padding: 0;
  background: #fff;
  color: #000;
  font-family: Arial, sans-serif;
  font-size: 18px;
  line-height: 1.45;
}

.header {
  border-bottom: 2px solid #000;
  padding: 0.75rem 1rem;
}

.header h1 {
  margin: 0;
  font-size: 1.2rem;
}

.header a {
  color: inherit;
  text-decoration: none;
}

.container {
  padding: 1rem;
  max-width: 42rem;
}

h2 {
  margin-top: 0;
  font-size: 1.25rem;
}

.book-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.book-item {
  border: 1px solid #000;
  margin-bottom: 0.6rem;
  padding: 0.6rem;
}

.book-link {
  display: inline-block;
  min-height: 44px;
  color: #000;
  text-decoration: none;
  font-weight: bold;
}

.format {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.95rem;
}

.btn {
  display: inline-block;
  min-height: 44px;
  padding: 0.7rem 1rem;
  border: 2px solid #000;
  text-decoration: none;
  color: #000;
  font-weight: bold;
}

code {
  border: 1px solid #000;
  padding: 0.1rem 0.3rem;
}