:root {
  --bg: #faf6ef;
  --ink: #2b241c;
  --muted: #7a6f5f;
  --card: #ffffff;
  --accent: #a8552c;
  --shadow: 0 4px 14px rgba(43, 36, 28, 0.12);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Georgia", "Iowan Old Style", serif;
  background: var(--bg);
  color: var(--ink);
}

header {
  padding: 2.5rem 2rem 1rem;
  text-align: center;
}

header h1 {
  margin: 0;
  font-size: 2.4rem;
  letter-spacing: 0.02em;
}

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

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 2rem 4rem;
}

.shelf {
  margin-bottom: 2.5rem;
}

.shelf h2 {
  text-transform: capitalize;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
  padding-bottom: 0.15rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}

.book-card {
  background: var(--card);
  border-radius: 8px;
  box-shadow: var(--shadow);
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.15s ease;
  display: flex;
  flex-direction: column;
}

.book-card:hover {
  transform: translateY(-4px);
}

.cover-wrap {
  aspect-ratio: 2 / 3;
  background: #e8e0d2;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.cover-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cover-placeholder {
  font-size: 0.75rem;
  color: var(--muted);
  text-align: center;
  padding: 0.5rem;
}

.book-title {
  font-size: 0.85rem;
  font-weight: bold;
  padding: 0.5rem 0.5rem 0;
  line-height: 1.2;
}

.book-author {
  font-size: 0.75rem;
  color: var(--muted);
  padding: 0.15rem 0.5rem 0.6rem;
}

#modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

#modal-backdrop.hidden {
  display: none;
}

#modal {
  background: var(--card);
  max-width: 600px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  border-radius: 10px;
  padding: 2rem;
  position: relative;
  box-shadow: var(--shadow);
}

#modal-close {
  position: absolute;
  top: 0.75rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--muted);
}

.modal-cover {
  float: left;
  width: 120px;
  margin: 0 1rem 0.5rem 0;
  border-radius: 4px;
}

.modal-meta {
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0.3rem 0;
}

.empty-state {
  text-align: center;
  color: var(--muted);
  padding: 3rem 1rem;
}

.empty-state code {
  background: #eee2cf;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
  padding: 1.5rem 1rem 2.5rem;
}

footer a {
  color: var(--accent);
}