* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: #222;
  background: #fafafa;
  line-height: 1.5;
}

header {
  background: #274a2e;
  color: #fff;
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.site-title {
  color: #fff;
  font-size: 1.25rem;
  font-weight: 700;
  text-decoration: none;
}

.header-search {
  display: flex;
  gap: 6px;
  flex: 1;
  min-width: 200px;
}

.header-search input {
  flex: 1;
}

.add-link {
  color: #fff;
  text-decoration: none;
  padding: 6px 12px;
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 6px;
  white-space: nowrap;
}

.add-link:hover {
  background: rgba(255, 255, 255, 0.15);
}

.logout-form button {
  background: none;
  border: none;
  color: #fff;
  cursor: pointer;
  text-decoration: underline;
  padding: 6px;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px 16px;
}

input,
select,
button {
  font: inherit;
  padding: 8px 10px;
  border: 1px solid #bbb;
  border-radius: 6px;
  background: #fff;
}

button {
  cursor: pointer;
  background: #274a2e;
  color: #fff;
  border-color: #274a2e;
}

button:hover {
  filter: brightness(1.1);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
}

.card {
  display: flex;
  flex-direction: column;
  border: 1px solid #ddd;
  border-radius: 8px;
  background: #fff;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  padding: 8px;
}

.card:hover {
  border-color: #274a2e;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.card-cover {
  width: 100%;
  aspect-ratio: 2 / 3;
  object-fit: cover;
  background: #eee;
}

.card-no-cover,
.book-no-cover {
  aspect-ratio: 2 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #eee;
  color: #777;
}

.card-title {
  font-weight: 600;
  margin-top: 8px;
}

.card-author {
  color: #666;
}

.card-location {
  color: #888;
  font-size: 0.85rem;
}

.pagination {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: center;
  margin-top: 24px;
}

table {
  border-collapse: collapse;
  width: 100%;
  background: #fff;
}

th,
td {
  border: 1px solid #ddd;
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}

th {
  background: #f0f0f0;
}

.search-form {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.search-form input[type="search"] {
  flex: 1;
  min-width: 200px;
}

.book-view .book-main {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.book-cover {
  max-width: 260px;
  width: 100%;
  border: 1px solid #ddd;
  background: #fff;
}

.book-info {
  flex: 1;
  min-width: 260px;
}

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

.location-list li::before {
  content: "• ";
}

.thumbs {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.thumbs figure {
  margin: 0;
  max-width: 180px;
}

.thumbs img {
  width: 100%;
  border: 1px solid #ddd;
  background: #fff;
}

.thumbs figcaption {
  font-size: 0.85rem;
  color: #666;
}

fieldset {
  border: 1px solid #ddd;
  border-radius: 8px;
  margin: 16px 0;
  background: #fff;
}

legend {
  font-weight: 600;
  padding: 0 6px;
}

form label {
  display: block;
  margin: 10px 0;
}

form label input,
form label select {
  display: block;
  width: 100%;
  max-width: 480px;
  margin-top: 4px;
}

.toc-edit input {
  width: 100%;
}

.error {
  color: #a00;
  font-weight: 600;
}

@media (max-width: 600px) {
  .cards {
    grid-template-columns: 1fr;
  }

  .header-inner {
    flex-direction: column;
    align-items: stretch;
  }
}