*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  background: #000;
  color: #fff;
  font-family: Georgia, serif;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

/* ── Shelf ─────────────────────────────────────────────── */

.shelf-page {
  overflow-y: auto;
  padding: 60px 32px 60px;
}

.shelf-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 48px;
}

.shelf-title {
  font-size: 13px;
  font-weight: normal;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #555;
  margin-bottom: 0;
}

.settings-link {
  font-size: 13px;
  color: #555;
  text-decoration: none;
  letter-spacing: 0.05em;
}

.settings-link:hover {
  color: #fff;
}

.back-link {
  font-size: 13px;
  color: #555;
  text-decoration: none;
  letter-spacing: 0.05em;
}

.back-link:hover {
  color: #fff;
}

/* ── Settings ────────────────────────────────────────────── */

.settings-group {
  margin-bottom: 48px;
  border-top: 1px solid #1a1a1a;
  padding-top: 24px;
}

.settings-label {
  font-size: 13px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #555;
  margin-bottom: 8px;
}

.settings-description {
  font-size: 13px;
  color: #333;
  margin-bottom: 20px;
}

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

.settings-option {
  background: none;
  border: 1px solid #333;
  color: #555;
  font-family: Georgia, serif;
  font-size: 16px;
  padding: 10px 20px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}

.settings-option:hover {
  border-color: #555;
  color: #fff;
}

.settings-option.selected {
  border-color: #fff;
  color: #fff;
}

.book-list {
  list-style: none;
}

.book-list li {
  border-top: 1px solid #1a1a1a;
  padding: 24px 0;
}

.book-list li:last-child {
  border-bottom: 1px solid #1a1a1a;
}

.book-list a {
  text-decoration: none;
  color: #fff;
  display: block;
}

.book-list .book-title {
  font-size: 20px;
  line-height: 1.3;
  margin-bottom: 6px;
}

.book-list .book-author {
  font-size: 13px;
  color: #555;
  letter-spacing: 0.05em;
}

/* ── Reader ─────────────────────────────────────────────── */

.reader-page {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sentence-display {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 80px 40px;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}

/* Each word is a span injected by reader.js */
.word {
  display: inline;
  opacity: 0;
  transition: opacity 0.35s ease;
  white-space: pre-wrap;
}

.word.visible {
  opacity: 1;
}

.sentence-text {
  font-size: var(--sentence-size, 22px);
  line-height: 1.7;
  color: #fff;
  max-width: 680px;
  text-align: var(--sentence-align, center);
  transition: margin-top 0.6s ease;
}

/* Top fade — masks text scrolling behind the menu bar */
.reader-page::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 120px;
  background: linear-gradient(to bottom, #000 40%, transparent);
  z-index: 5;
  pointer-events: none;
}

/* ── Touch zones ─────────────────────────────────────────── */

.zone {
  position: absolute;
  z-index: 10;
}

/* Top 25% */
.zone-top {
  top: 0; left: 0; right: 0;
  height: 25%;
}

/* Bottom 25% */
.zone-bottom {
  bottom: 0; left: 0; right: 0;
  height: 25%;
}

/* Middle 50%, left third */
.zone-left {
  top: 25%; left: 0;
  width: 33.333%; height: 50%;
}

/* Middle 50%, center third */
.zone-center {
  top: 25%; left: 33.333%;
  width: 33.333%; height: 50%;
}

/* Middle 50%, right third */
.zone-right {
  top: 25%; right: 0;
  width: 33.333%; height: 50%;
}

/* ── Menu ────────────────────────────────────────────────── */

.reader-menu {
  position: absolute;
  top: 0; left: 0; right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  border-bottom: 1px solid #1a1a1a;
}

.reader-menu.visible {
  opacity: 1;
  pointer-events: auto;
}

.menu-back {
  font-size: 13px;
  color: #fff;
  text-decoration: none;
  letter-spacing: 0.05em;
}

.menu-title {
  font-size: 13px;
  color: #555;
  text-align: center;
  flex: 1;
  padding: 0 16px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.menu-progress {
  font-size: 13px;
  color: #555;
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
}

.menu-progress:hover {
  color: #fff;
}

/* ── TOC overlay ─────────────────────────────────────────── */

.toc-overlay {
  display: none;
  position: absolute;
  inset: 0;
  z-index: 19;
  background: #000;
  overflow-y: auto;
  padding: 80px 0 40px;
}

.toc-overlay.visible {
  display: block;
}

.toc-list {
  list-style: none;
}

.toc-item {
  border-top: 1px solid #1a1a1a;
  padding: 20px 32px;
  font-size: 16px;
  color: #555;
  cursor: pointer;
  font-family: Georgia, serif;
}

.toc-item:last-child {
  border-bottom: 1px solid #1a1a1a;
}

.toc-item:hover {
  color: #fff;
}

.toc-item.toc-current {
  color: #fff;
}

.toc-item.toc-resume {
  color: #fff;
  border-bottom: 1px solid #333;
  margin-bottom: 16px;
}