:root {
  --books-bg: #f6f3ec;
  --books-card: #fffefb;
  --books-text: #292722;
  --books-muted: #706d65;
  --books-border: #ded9ce;
  --books-accent: #8b3f2f;
  --books-chrome: rgba(255, 254, 251, 0.96);
  --books-shadow: rgba(53, 45, 35, 0.14);
  --books-font-size: 1.1rem;
  --books-page-gap: 2.5rem;
  --books-page-padding-x: 1.25rem;
  --books-page-padding-y: 1rem;
  --books-tts-fallback-highlight: rgba(139, 63, 47, 0.07);
  --books-tts-clause-highlight: rgba(139, 63, 47, 0.3);
}

html.books-theme-dark {
  --books-bg: #181917;
  --books-card: #232420;
  --books-text: #e9e7df;
  --books-muted: #aaa89f;
  --books-border: #3b3d37;
  --books-accent: #e0a08d;
  --books-chrome: rgba(35, 36, 32, 0.96);
  --books-shadow: rgba(0, 0, 0, 0.38);
  --books-tts-fallback-highlight: rgba(224, 160, 141, 0.1);
  --books-tts-clause-highlight: rgba(224, 160, 141, 0.34);
  color-scheme: dark;
}

html.books-theme-dark body {
  background: var(--books-bg);
  color: var(--books-text);
}

.books-reading .header {
  display: none;
}

html.books-reading body {
  padding-top: 0;
}

html.books-page-reading,
html.books-page-reading body {
  overflow: hidden;
}

html.books-page-reading .books-shell {
  min-height: 100vh;
  padding: 0;
}

.books-shell {
  background: var(--books-bg);
  color: var(--books-text);
  min-height: calc(100vh - 5rem);
  padding: 2rem max(1rem, calc((100vw - 72rem) / 2));
}

.books-view[hidden],
.books-reader-view[hidden] {
  display: none;
}

.books-page-heading {
  align-items: center;
  display: flex;
  gap: 1.25rem;
  margin-bottom: 1.75rem;
}

.books-page-heading h1,
.books-book-heading h1 {
  color: var(--books-text);
  margin: 0;
}

.books-back-link,
.books-text-button,
.books-toc a {
  color: var(--books-accent);
}

.books-scope-ask { display: inline-block; margin-top: .75rem; }
.books-scope-ask[hidden] { display: none; }

.books-text-button {
  background: none;
  border: 0;
  cursor: pointer;
  font: inherit;
  margin-bottom: 1.5rem;
  padding: 0;
}

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

.books-sign-in {
  color: var(--books-accent);
  display: inline-block;
  margin: -0.75rem 0 1.25rem;
}

.books-sign-in[hidden] {
  display: none;
}

.books-shelf {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}

.books-card {
  background: var(--books-card);
  border: 1px solid var(--books-border);
  border-radius: 12px;
  box-shadow: 0 5px 18px var(--books-shadow);
  color: var(--books-text);
  cursor: pointer;
  display: grid;
  gap: 1rem;
  grid-template-columns: 88px minmax(0, 1fr);
  padding: 1rem;
  text-align: left;
  width: 100%;
}

.books-card-cover,
.books-cover-placeholder {
  aspect-ratio: 3 / 4;
  background: #d9d2c4;
  border-radius: 5px;
  box-shadow: 0 3px 9px var(--books-shadow);
  object-fit: cover;
  width: 88px;
}

.books-cover-placeholder {
  align-items: center;
  color: #6d665b;
  display: flex;
  font-size: 1.8rem;
  justify-content: center;
}

.books-card h2 {
  color: var(--books-text);
  font-size: 1.1rem;
  margin: 0 0 0.4rem;
}

.books-author,
.books-series,
.books-key-verses,
.books-description,
.books-card p {
  color: var(--books-muted);
}

.books-series,
.books-key-verses {
  font-size: 0.9rem;
  margin: 0.25rem 0;
}

.books-card p {
  display: -webkit-box;
  font-size: 0.9rem;
  margin: 0.25rem 0;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.books-card-progress {
  align-items: center;
  display: flex;
  gap: 0.55rem;
  margin-top: 0.65rem;
}

.books-card-progress-track {
  background: var(--books-border);
  border-radius: 999px;
  flex: 1;
  height: 3px;
  overflow: hidden;
}

.books-card-progress-track span {
  background: var(--books-accent);
  display: block;
  height: 100%;
}

.books-card-progress-label {
  color: var(--books-muted);
  font-size: 0.78rem;
  white-space: nowrap;
}

.books-progress-dialog {
  background: var(--books-card);
  border: 1px solid var(--books-border);
  border-radius: 14px;
  color: var(--books-text);
  margin: auto;
  max-width: min(90vw, 28rem);
  padding: 1.25rem;
  width: 100%;
}

.books-progress-dialog::backdrop {
  background: rgba(0, 0, 0, 0.42);
}

.books-progress-dialog h2 {
  font-size: 1.25rem;
  margin: 0 0 1rem;
}

.books-progress-dialog > button {
  background: transparent;
  border: 1px solid var(--books-border);
  border-radius: 9px;
  color: var(--books-text);
  cursor: pointer;
  display: block;
  margin-top: 0.7rem;
  padding: 0.8rem;
  text-align: left;
  width: 100%;
}

.books-progress-dialog > button span {
  color: var(--books-muted);
  display: block;
  font-size: 0.86rem;
  margin-top: 0.25rem;
}

.books-progress-dialog > .books-progress-later {
  border: 0;
  color: var(--books-muted);
  text-align: center;
}

#books-toc-view {
  margin: 0 auto;
  max-width: 52rem;
}

.books-book-heading {
  align-items: start;
  display: flex;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.books-toc-cover {
  border-radius: 6px;
  box-shadow: 0 4px 14px var(--books-shadow);
  max-height: 180px;
  object-fit: cover;
  width: 135px;
}

.books-toc-label {
  border-bottom: 1px solid var(--books-border);
  color: var(--books-text);
  padding-bottom: 0.6rem;
}

.books-toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

.books-toc > ol > li {
  border-bottom: 1px solid var(--books-border);
  padding: 0.8rem 0;
}

.books-toc ol ol {
  padding: 0.5rem 0 0 1.25rem;
}

.books-toc a {
  text-decoration: none;
}

.books-toc-section-link {
  font-size: 0.92rem;
}

.books-reader-view {
  min-height: 100vh;
  padding: 4.75rem 0 5rem;
}

.books-reader-content {
  box-sizing: border-box;
  color: var(--books-text);
  font-family: "Noto Serif CJK SC", "Source Han Serif SC", "Songti SC", SimSun, serif;
  font-size: var(--books-font-size);
  line-height: 1.8;
  margin: 0 auto;
  max-width: 40em;
  overflow-wrap: anywhere;
  padding: 1rem 1.25rem 3rem;
}

.books-reader-view.books-page-mode {
  height: 100vh;
  height: 100dvh;
  margin: 0;
  min-height: 0;
  overflow: hidden;
  padding: 0;
}

.books-page-mode .books-page-viewport {
  box-sizing: border-box;
  font-size: var(--books-font-size);
  height: 100vh;
  height: 100dvh;
  margin: 0 auto;
  max-width: 40em;
  overflow: hidden;
  padding: var(--books-page-padding-y) var(--books-page-padding-x);
  touch-action: pan-y;
  width: 100%;
}

.books-page-mode .books-reader-content {
  column-fill: auto;
  column-gap: var(--books-page-gap);
  height: 100%;
  margin: 0;
  max-width: none;
  padding: 0;
  transform: translate3d(0, 0, 0);
  width: 100%;
  will-change: transform;
}

.books-page-mode .books-reader-content img,
.books-page-mode .books-table-scroll {
  break-inside: avoid;
  break-inside: avoid-column;
  max-height: calc(100vh - 4rem);
  max-height: calc(100dvh - 4rem);
}

.books-page-mode .books-reader-content img {
  object-fit: contain;
}

.books-page-mode .books-table-scroll {
  overflow: auto;
}

.books-reader-content img {
  height: auto;
  max-width: 100%;
}

.books-reader-content a {
  color: var(--books-accent);
}

.books-reader-content blockquote {
  border-left: 3px solid var(--books-border);
  color: var(--books-muted);
  margin-left: 0;
  padding-left: 1rem;
}

.books-reader-content .books-tts-current {
  background: transparent;
}

.books-reader-content .books-tts-current.books-tts-fallback {
  background: var(--books-tts-fallback-highlight);
  border-radius: 4px;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

.books-reader-content [data-tts] {
  outline: 2px solid transparent;
  outline-offset: 3px;
  transition: background-color 600ms ease, outline-color 600ms ease;
}

.books-reader-content .books-cited {
  outline-color: #d97706;
  background-color: #fef3c7;
}

.books-theme-dark .books-reader-content .books-cited {
  outline-color: #fbbf24;
  background-color: rgb(146 64 14 / 45%);
}

.books-reader-content .books-tts-clause-current {
  background: var(--books-tts-clause-highlight);
  border-radius: 3px;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

.books-table-scroll {
  max-width: 100%;
  overflow-x: auto;
}

.books-reader-content table {
  border-collapse: collapse;
  min-width: 100%;
}

.books-reader-content th,
.books-reader-content td {
  border: 1px solid var(--books-border);
  padding: 0.4rem 0.6rem;
}

.books-reader-top,
.books-reader-bottom {
  align-items: center;
  background: var(--books-chrome);
  box-shadow: 0 2px 14px var(--books-shadow);
  box-sizing: border-box;
  display: flex;
  gap: 0.65rem;
  left: 0;
  padding: 0.75rem max(1rem, calc((100vw - 48rem) / 2));
  position: fixed;
  right: 0;
  transition: transform 180ms ease;
  z-index: 20;
}

.books-reader-top {
  top: 0;
}

.books-reader-bottom {
  bottom: 0;
  justify-content: space-between;
}

.books-tts-pill {
  align-items: center;
  background: var(--books-chrome);
  border: 1px solid var(--books-border);
  border-radius: 999px;
  box-shadow: 0 -2px 10px var(--books-shadow);
  box-sizing: border-box;
  bottom: 4.4rem;
  display: flex;
  gap: 0.35rem;
  left: 50%;
  max-width: calc(100vw - 2rem);
  padding: 0.35rem;
  position: fixed;
  transform: translateX(-50%);
  transition: opacity 180ms ease, transform 180ms ease;
  width: 27rem;
  z-index: 19;
}

.books-tts-pill[hidden],
.books-menu-hint[hidden] {
  display: none;
}

.books-tts-playback {
  align-items: center;
  background: transparent;
  border: 0;
  color: var(--books-text);
  cursor: pointer;
  display: flex;
  flex: 1;
  font: inherit;
  gap: 0.55rem;
  min-width: 0;
  padding: 0.35rem 0.55rem;
}

.books-tts-icon {
  font-size: 0.8rem;
  min-width: 1.2rem;
}

.books-tts-status {
  color: var(--books-muted);
  flex: 1;
  font-size: 0.9rem;
  min-width: 0;
  overflow: hidden;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.books-chrome-hidden .books-reader-top {
  transform: translateY(-110%);
}

.books-chrome-hidden .books-reader-bottom {
  transform: translateY(110%);
}

.books-chrome-hidden .books-tts-pill {
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, calc(100% + 5rem));
}

.books-chapter-title {
  flex: 1;
  font-weight: 600;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.books-page-indicator {
  color: var(--books-muted);
  font-size: 0.9rem;
  white-space: nowrap;
}

.books-chrome-button {
  background: transparent;
  border: 1px solid var(--books-border);
  border-radius: 6px;
  color: var(--books-text);
  cursor: pointer;
  font: inherit;
  padding: 0.4rem 0.65rem;
  white-space: nowrap;
}

a.books-chrome-button {
  align-items: center;
  color: var(--books-text);
  display: inline-flex;
  justify-content: center;
  text-decoration: none;
}

a.books-chrome-button[hidden] {
  display: none;
}

.books-chrome-button:disabled {
  cursor: default;
  opacity: 0.4;
}

.books-inline-chapter-nav {
  color: var(--books-muted);
  display: block;
  font-family: sans-serif;
  font-size: 0.82rem;
  text-decoration: none;
  width: fit-content;
}

.books-inline-chapter-nav-previous {
  margin: 0 0 1.75rem;
}

.books-inline-chapter-nav-next {
  margin: 2.5rem 0 0 auto;
}

.books-menu-hint {
  background: rgba(24, 25, 23, 0.82);
  border-radius: 999px;
  color: #fff;
  font-size: 0.86rem;
  left: 50%;
  padding: 0.55rem 0.9rem;
  pointer-events: none;
  position: fixed;
  top: 50%;
  transform: translate(-50%, -50%);
  white-space: nowrap;
  z-index: 30;
}

.books-retry-button {
  background: var(--books-accent);
  border: 0;
  border-radius: 6px;
  color: #fff;
  cursor: pointer;
  display: block;
  font: inherit;
  margin: 1rem auto 0;
  padding: 0.55rem 1.1rem;
}

@media (max-width: 600px) {
  .books-shell {
    min-height: calc(100vh - 4rem);
    padding: 1.25rem 1rem;
  }

  .books-shelf {
    display: block;
  }

  .books-card {
    margin-bottom: 1rem;
  }

  .books-book-heading {
    gap: 1rem;
  }

  .books-toc-cover {
    max-height: 128px;
    width: 96px;
  }

  .books-reader-view {
    margin: -1.25rem -1rem;
  }

  .books-reader-bottom {
    gap: 0.25rem;
    padding-left: 0.5rem;
    padding-right: 0.5rem;
  }

  .books-tts-pill {
    bottom: 3.85rem;
    width: calc(100vw - 1rem);
  }

  .books-chrome-button {
    font-size: 0.82rem;
    padding: 0.34rem 0.4rem;
  }

  .books-reader-bottom .books-chrome-button {
    flex: 1;
  }
}