:root {
  color-scheme: light;
  --bg: #f6f4ee;
  --surface: #ffffff;
  --surface-muted: #f0ece2;
  --text: #1d1b16;
  --muted: #6b6458;
  --border: #d6cebf;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, sans-serif;
  font-size: 18px;
  line-height: 1.45;
}

img {
  max-width: 100%;
}

.header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  padding: 0.9rem 1rem;
}

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

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

.container {
  padding: 1rem;
  max-width: 56rem;
  margin: 0 auto;
}

h2 {
  margin-top: 0;
  font-size: 1.4rem;
}

.page-head {
  margin-bottom: 1rem;
}

.page-subtitle {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.book-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.book-item {
  margin: 0;
}

.book-card {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 0.9rem;
  align-items: start;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  padding: 0.8rem;
  color: inherit;
  text-decoration: none;
  box-shadow: var(--shadow);
}

.book-card-cover,
.book-detail-cover {
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.book-cover,
.book-cover-placeholder {
  width: 100%;
  max-width: 5.5rem;
  aspect-ratio: 2 / 3;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-muted);
  object-fit: cover;
  overflow: hidden;
}

.book-cover-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: bold;
  letter-spacing: 0.08em;
}

.book-cover-detail,
.book-cover-placeholder-detail {
  max-width: 12rem;
}

.book-card-body {
  min-width: 0;
}

.book-title {
  display: block;
  font-size: 1.05rem;
}

.book-author,
.book-author-detail {
  display: block;
  color: var(--muted);
}

.book-author {
  margin-top: 0.2rem;
  font-size: 0.95rem;
}

.book-author-detail {
  margin: -0.35rem 0 1rem;
}

.format {
  display: inline-block;
  margin-top: 0.6rem;
  padding: 0.15rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.85rem;
  text-transform: uppercase;
  background: var(--surface-muted);
}

.book-detail {
  display: grid;
  gap: 1.25rem;
}

.book-detail-body {
  min-width: 0;
}

.book-meta {
  margin: 0 0 1.25rem;
}

.book-meta div {
  margin-bottom: 0.8rem;
}

.book-meta dt {
  font-weight: bold;
}

.book-meta dd {
  margin: 0.2rem 0 0;
  color: var(--muted);
  word-break: break-word;
}

.back-link {
  color: var(--muted);
  text-decoration: none;
}

.btn {
  display: inline-block;
  min-height: 44px;
  padding: 0.7rem 1rem;
  border: 1px solid var(--text);
  border-radius: 999px;
  text-decoration: none;
  color: #fff;
  background: var(--text);
  font-weight: bold;
}

code {
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  padding: 0.1rem 0.3rem;
}

@media (min-width: 700px) {
  .book-detail {
    grid-template-columns: 12rem 1fr;
    align-items: start;
  }
}