/* Open Shelf — warm library aesthetic */

:root {
  --color-bg: #f5f0e8;
  --color-surface: #fffcf7;
  --color-ink: #2c2419;
  --color-ink-muted: #5c5348;
  --color-accent: #8b4513;
  --color-accent-hover: #6d3610;
  --color-border: #ddd4c8;
  --color-error: #9b2c2c;
  --font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --shadow-card: 0 2px 8px rgb(44 36 25 / 0.08);
  --shadow-panel: 0 8px 32px rgb(44 36 25 / 0.18);
  --radius: 8px;
  --max-width: 72rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-ink);
  background: var(--color-bg);
}

body.detail-open {
  overflow: hidden;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 0.5rem 1rem;
  background: var(--color-accent);
  color: #fff;
}

.skip-link:focus {
  left: 0;
}

/* Header & footer */

.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 1.25rem 1rem;
}

.site-header__inner,
.site-footer__inner,
.site-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

.site-logo {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--color-ink);
  text-decoration: none;
}

.site-logo:hover {
  color: var(--color-accent);
}

.site-tagline {
  margin: 0.25rem 0 0;
  font-size: 0.9rem;
  color: var(--color-ink-muted);
}

.site-main {
  flex: 1;
  padding-top: 2rem;
  padding-bottom: 3rem;
}

.site-footer {
  margin-top: auto;
  padding: 1.5rem 1rem;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  font-size: 0.875rem;
  color: var(--color-ink-muted);
}

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

/* Search */

.search-section {
  margin-bottom: 2rem;
}

.search-form__label {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

.search-form__row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.search-form__input {
  flex: 1 1 16rem;
  min-width: 0;
  padding: 0.65rem 0.85rem;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-ink);
}

.search-form__input:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.search-form__submit {
  padding: 0.65rem 1.25rem;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
}

.search-form__submit:hover {
  background: var(--color-accent-hover);
}

.status-region {
  min-height: 1.5rem;
  margin: 0.75rem 0 0;
  font-size: 0.9rem;
  color: var(--color-ink-muted);
}

/* Results */

.results-section__header {
  margin-bottom: 1rem;
}

.results-section__title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  margin: 0 0 0.25rem;
}

.results-meta {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-ink-muted);
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(11rem, 1fr));
  gap: 1.25rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

@media (min-width: 48rem) {
  .results-grid {
    grid-template-columns: repeat(auto-fill, minmax(12.5rem, 1fr));
  }
}

.book-card {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  text-align: left;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
  cursor: pointer;
  font: inherit;
  color: inherit;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.book-card:hover,
.book-card:focus-visible {
  transform: translateY(-2px);
  box-shadow: var(--shadow-panel);
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.book-card__cover-wrap {
  display: block;
  aspect-ratio: 2 / 3;
  overflow: hidden;
  border-radius: var(--radius) var(--radius) 0 0;
  background: #e8e0d4;
}

.book-card__cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.book-card__body {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.75rem;
}

.book-card__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-card__subtitle {
  font-size: 0.8rem;
  color: var(--color-ink-muted);
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-card__authors {
  font-size: 0.8rem;
  color: var(--color-ink-muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.25rem;
  font-size: 0.75rem;
}

.book-card__year,
.book-card__editions {
  padding: 0.1rem 0.4rem;
  background: var(--color-bg);
  border-radius: 4px;
  color: var(--color-ink-muted);
}

/* Pagination */

.pagination {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 2rem;
}

.pagination__btn {
  padding: 0.5rem 1rem;
  font-size: 0.95rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  cursor: pointer;
}

.pagination__btn:hover:not(:disabled) {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.pagination__btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.pagination__info {
  font-size: 0.9rem;
  color: var(--color-ink-muted);
}

/* States */

.state {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--color-ink-muted);
}

.state--error {
  color: var(--color-error);
}

.btn-secondary {
  margin-top: 0.75rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  cursor: pointer;
}

.spinner {
  width: 2.5rem;
  height: 2.5rem;
  margin: 0 auto 0.75rem;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Detail panel */

.detail-panel {
  position: fixed;
  inset: 0;
  z-index: 50;
}

.detail-panel:not([hidden]) {
  display: flex;
  align-items: stretch;
  justify-content: flex-end;
}

.detail-panel[hidden] {
  display: none !important;
}

.detail-panel__backdrop {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: rgb(44 36 25 / 0.45);
  cursor: pointer;
}

.detail-panel__sheet {
  position: relative;
  z-index: 1;
  width: min(100%, 28rem);
  max-height: 100%;
  overflow-y: auto;
  background: var(--color-surface);
  box-shadow: var(--shadow-panel);
  padding: 1.5rem 1.25rem 2rem;
}

@media (min-width: 40rem) {
  .detail-panel__sheet {
    width: min(100%, 32rem);
  }
}

.detail-panel__close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  width: 2.25rem;
  height: 2.25rem;
  border: none;
  border-radius: var(--radius);
  background: var(--color-bg);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  color: var(--color-ink);
}

.detail-panel__close:hover {
  background: var(--color-border);
}

.detail-panel__content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.detail-panel__cover-wrap {
  text-align: center;
}

.detail-panel__cover {
  max-width: 200px;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.detail-panel__title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  margin: 0;
  padding-right: 2rem;
}

.detail-panel__subtitle {
  margin: 0.25rem 0 0;
  font-size: 1rem;
  color: var(--color-ink-muted);
}

.detail-panel__authors {
  margin: 0.5rem 0 0;
  font-size: 0.95rem;
}

.detail-panel__meta {
  margin: 0.75rem 0 0;
  display: grid;
  gap: 0.35rem;
  font-size: 0.9rem;
}

.detail-panel__meta dt {
  font-weight: 600;
  display: inline;
}

.detail-panel__meta dt::after {
  content: ": ";
}

.detail-panel__meta dd {
  display: inline;
  margin: 0;
  color: var(--color-ink-muted);
}

.detail-panel__description {
  margin-top: 0.75rem;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-ink);
}

.detail-panel__subjects {
  font-size: 0.85rem;
  color: var(--color-ink-muted);
  margin: 0;
}

.detail-panel__link {
  display: inline-block;
  margin-top: 0.5rem;
  font-weight: 600;
  color: var(--color-accent);
}

.detail-panel__link:hover {
  color: var(--color-accent-hover);
}

.detail-panel__loading {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--color-ink-muted);
}