/* 教材库 — docs 风格，延续 Atelier Zero 令牌 */

.books-page,
.reader-page,
.search-page {
  min-height: 100vh;
}

.books-shell,
.reader-shell {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(1rem, 3vw, 2rem) 4rem;
}

.books-page .site-chrome,
.reader-page .site-chrome,
.search-page .site-chrome {
  margin: 0 calc(-1 * clamp(1rem, 3vw, 2rem));
  padding: 0 clamp(1rem, 3vw, 2rem);
}

.books-hero {
  margin: clamp(2rem, 4vw, 3rem) 0 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--line-soft);
}

.books-hero h1 {
  margin-bottom: 0.75rem;
}

.books-hero .lead {
  max-width: 42rem;
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.external-hero {
  margin-top: 3rem;
  margin-bottom: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line-faint);
}

.external-hero h2 {
  margin: 0.35rem 0 0.75rem;
}

.external-card .badge {
  display: none;
}

.book-card {
  display: grid;
  gap: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.25rem 1.2rem 1.35rem;
  background: var(--bone);
  box-shadow: var(--shadow), inset 0 0 0 1px rgba(21, 20, 15, 0.04);
  transition: transform 200ms ease, border-color 200ms ease;
}

.book-card:hover {
  transform: translateY(-2px);
  border-color: rgba(237, 111, 92, 0.3);
}

.book-card .badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  border-radius: 999px;
  padding: 0.3rem 0.65rem;
  color: var(--coral);
  background: rgba(237, 111, 92, 0.1);
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.book-card h2 {
  margin: 0;
  font-family: var(--sans);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.book-card .meta {
  margin: 0;
  color: var(--ink-mute);
  font-size: 0.9rem;
  line-height: 1.65;
}

.book-card .meta a {
  color: var(--coral);
  font-weight: 500;
}

.book-card .actions {
  margin-top: 0.25rem;
}

/* Reader — three-column docs layout */
.reader-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 0;
  align-items: start;
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  background: var(--bone);
  box-shadow: var(--shadow), inset 0 0 0 1px rgba(21, 20, 15, 0.04);
}

.reader-sidebar {
  position: sticky;
  top: 5.5rem;
  display: grid;
  gap: 0.75rem;
  max-height: calc(100vh - 6.5rem);
  overflow: auto;
  padding: 1rem;
  border-right: 1px solid var(--line-soft);
  background: color-mix(in oklab, var(--bone) 88%, var(--paper-warm));
}

.reader-sidebar h2 {
  margin: 0;
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.reader-sidebar .book-switch {
  display: grid;
  gap: 0.35rem;
}

.reader-sidebar .book-switch a {
  border-radius: 8px;
  padding: 0.45rem 0.55rem;
  color: var(--ink-mute);
  font-size: 0.86rem;
  font-weight: 500;
}

.reader-sidebar .book-switch a.active,
.reader-sidebar .book-switch a:hover {
  color: var(--ink);
  background: rgba(21, 20, 15, 0.05);
}

.reader-toc {
  display: grid;
  gap: 0.65rem;
}

.reader-toc section {
  display: grid;
  gap: 0.25rem;
}

.reader-toc h3 {
  margin: 0;
  color: var(--coral);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.reader-toc a {
  display: block;
  border-radius: 6px;
  padding: 0.35rem 0.45rem;
  color: var(--ink-mute);
  font-size: 0.84rem;
  line-height: 1.45;
}

.reader-toc a.active {
  color: #fff;
  background: var(--coral);
}

.reader-toc a:hover:not(.active) {
  color: var(--ink);
  background: rgba(21, 20, 15, 0.05);
}

.reader-headings-wrap {
  display: grid;
  gap: 0.35rem;
  margin-top: 0.25rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--line-soft);
}

.reader-headings-wrap h3 {
  margin: 0;
  color: var(--ink-faint);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.reader-headings {
  display: grid;
  gap: 0.15rem;
}

.reader-headings a {
  display: block;
  border-radius: 6px;
  padding: 0.28rem 0.4rem;
  color: var(--ink-mute);
  font-size: 0.8rem;
  line-height: 1.4;
}

.reader-headings a.depth-2 {
  padding-left: 0.85rem;
}

.reader-headings a.active,
.reader-headings a:hover {
  color: var(--ink);
  background: rgba(21, 20, 15, 0.05);
}

.reader-main {
  min-width: 0;
  padding: clamp(1.25rem, 3vw, 2.25rem) clamp(1.25rem, 4vw, 3.5rem) 3rem;
  background: var(--paper);
}

.reader-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line-soft);
}

.reader-toolbar .crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  color: var(--ink-faint);
  font-size: 0.82rem;
}

.reader-toolbar .crumbs a {
  color: var(--coral);
  font-weight: 500;
}

.reader-toolbar .nav-buttons {
  display: flex;
  gap: 0.45rem;
}

.reader-toolbar button {
  cursor: pointer;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.4rem 0.75rem;
  color: var(--ink-mute);
  background: var(--bone);
  font: 500 0.8rem var(--sans);
  transition: background 160ms ease;
}

.reader-toolbar button:hover:not(:disabled) {
  background: rgba(21, 20, 15, 0.05);
}

.reader-toolbar button:disabled {
  cursor: not-allowed;
  opacity: 0.4;
}

.reader-content {
  max-width: 760px;
  color: var(--ink-soft);
  line-height: 1.8;
}

.reader-content a {
  color: var(--coral);
  word-break: break-word;
  overflow-wrap: anywhere;
}

.reader-content code {
  word-break: break-word;
}

.reader-content > :first-child {
  margin-top: 0;
}

.reader-content h1,
.reader-content h2,
.reader-content h3,
.reader-content h4 {
  color: var(--ink);
  scroll-margin-top: 5rem;
}

.reader-content h1 {
  font-size: clamp(1.85rem, 3.5vw, 2.5rem);
  margin-bottom: 0.75rem;
}

.reader-content h2 {
  margin-top: 2.25rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--line-faint);
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
}

.reader-content h3 {
  margin-top: 1.5rem;
  font-size: 1.1rem;
}

.reader-content blockquote {
  margin: 1.25rem 0;
  border-left: 3px solid var(--coral);
  padding: 0.15rem 0 0.15rem 1rem;
  color: var(--ink-mute);
  background: rgba(237, 111, 92, 0.04);
  border-radius: 0 8px 8px 0;
}

.reader-content table {
  width: 100%;
  margin: 1.25rem 0;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.reader-content th,
.reader-content td {
  border: 1px solid var(--line);
  padding: 0.5rem 0.65rem;
  text-align: left;
}

.reader-content th {
  background: var(--bone);
  font-weight: 600;
}

.reader-status {
  border-radius: 10px;
  padding: 1rem 1.1rem;
  color: var(--ink-mute);
  background: var(--bone);
  border: 1px solid var(--line-soft);
}

.reader-status.error {
  color: #8b2e2e;
  background: #fff5f3;
  border-color: rgba(237, 111, 92, 0.25);
}

/* Search */
.search-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 200px;
  gap: 0.75rem;
  align-items: end;
}

.search-controls-page {
  max-width: 720px;
}

.search-field {
  display: grid;
  gap: 0.35rem;
}

.search-label {
  color: var(--ink-faint);
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.search-filter,
.search-input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.75rem 0.9rem;
  color: var(--ink);
  background: var(--bone);
  font: 400 0.92rem var(--body);
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.search-input-large {
  padding: 0.95rem 1rem;
  font-size: 1rem;
}

.search-input:focus,
.search-filter:focus {
  outline: none;
  border-color: var(--coral);
  box-shadow: 0 0 0 3px rgba(237, 111, 92, 0.15);
}

.search-scope-hint {
  margin: 0.4rem 0 0;
  color: var(--ink-faint);
  font-size: 0.8rem;
}

.search-kind {
  display: inline-flex;
  margin-right: 0.35rem;
  border-radius: 999px;
  padding: 0.1rem 0.4rem;
  color: var(--coral);
  background: rgba(237, 111, 92, 0.1);
  font-size: 0.68rem;
  font-weight: 600;
}

.search-bar-wrap {
  position: relative;
  margin-top: 1.25rem;
  max-width: 720px;
}

.search-bar-inline {
  margin-top: 1.5rem;
}

.search-results {
  position: absolute;
  z-index: 30;
  top: calc(100% + 0.4rem);
  left: 0;
  right: 0;
  display: grid;
  gap: 0.2rem;
  max-height: 400px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.4rem;
  background: var(--bone);
  box-shadow: var(--shadow);
}

.search-results-page {
  position: static;
  margin-top: 1rem;
  max-height: none;
  border: none;
  border-radius: 0;
  padding: 0;
  background: transparent;
  box-shadow: none;
}

.search-result {
  display: grid;
  gap: 0.15rem;
  border-radius: 8px;
  padding: 0.65rem 0.75rem;
  color: var(--ink);
}

.search-result:hover {
  background: rgba(21, 20, 15, 0.05);
}

.search-result strong {
  font-family: var(--sans);
  font-size: 0.92rem;
  font-weight: 600;
}

.search-meta,
.search-snippet,
.search-hint {
  color: var(--ink-mute);
  font-size: 0.82rem;
  line-height: 1.55;
}

.search-hint.error {
  color: #8b2e2e;
}

.search-result mark {
  padding: 0 0.1em;
  color: var(--coral);
  background: rgba(237, 111, 92, 0.12);
  border-radius: 3px;
}

.search-page-panel {
  max-width: 720px;
}

.reader-content pre {
  position: relative;
  overflow: auto;
  border-radius: 10px;
  margin: 1.1rem 0;
  padding: 0.95rem 1rem;
  color: #e8e4dc;
  background: var(--ink);
  border: 1px solid rgba(21, 20, 15, 0.2);
}

.reader-content pre.has-copy {
  padding-top: 2.2rem;
}

.reader-content pre code {
  display: block;
  font-family: var(--mono);
  font-size: 0.84rem;
  line-height: 1.6;
  color: inherit;
  background: transparent;
}

.reader-content pre code.hljs {
  background: transparent;
}

.reader-content :not(pre) > code {
  border-radius: 4px;
  padding: 0.1rem 0.32rem;
  color: var(--ink-soft);
  background: rgba(21, 20, 15, 0.06);
  font-family: var(--mono);
  font-size: 0.88em;
}

.reader-content .code-copy {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 999px;
  padding: 0.22rem 0.55rem;
  color: rgba(255, 255, 255, 0.85);
  background: rgba(255, 255, 255, 0.08);
  font: 600 0.72rem var(--sans);
}

.reader-content .katex-display {
  margin: 1.2rem 0;
  overflow-x: auto;
}

@media (max-width: 980px) {
  .book-grid,
  .reader-layout,
  .search-controls {
    grid-template-columns: minmax(0, 1fr);
  }

  .reader-sidebar {
    position: static;
    max-height: none;
    border-right: none;
    border-bottom: 1px solid var(--line-soft);
  }
}