/* ═══════════════════════════════════════════════════════
   共读模块 — Reading Panel
   书架 + 阅读器样式
   ═══════════════════════════════════════════════════════ */

/* ── Panel shell ──────────────────────────────────── */
.reading-panel {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: var(--bg-primary-warm);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  will-change: transform;
  transition: transform .3s cubic-bezier(.2,.8,.2,1);
}
.reading-panel.collapsed {
  transform: translateX(-100%);
}
/* 电脑端：靠左，固定宽度 */
@media (min-width: 768px) {
  .reading-panel {
    right: auto;
    width: 420px;
    border-right: 1px solid var(--border);
    box-shadow: var(--shadow-lg, 0 8px 28px rgba(31,30,29,0.10));
  }
  /* 阅读器打开时：书架收起，聊天区全宽 */
  body.reader-open .composer-wrap {
    display: none;
  }
}

.reading-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 44px;
  padding: calc(env(safe-area-inset-top) + 8px) 14px 0;
  flex: none;
  border-bottom: 0.5px solid var(--border-secondary);
  background: inherit;
}
.reading-header-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}
.reading-header button {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: transparent;
  font-size: 20px;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast, .15s);
}
.reading-header button:active {
  background: var(--claude-selected-bg);
}
.reading-header .spacer {
  width: 36px;
}

/* ── Shelf view ───────────────────────────────────── */
.reading-shelf {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  -webkit-overflow-scrolling: touch;
}

.shelf-upload-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  height: 56px;
  border: 1.5px dashed var(--border-secondary);
  border-radius: 14px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 15px;
  cursor: pointer;
  margin-bottom: 20px;
  transition: background var(--transition-fast, .15s), border-color var(--transition-fast, .15s);
}
.shelf-upload-btn:active {
  background: var(--claude-selected-bg);
  border-color: var(--text-secondary);
}
.shelf-upload-btn .plus {
  font-size: 22px;
  font-weight: 300;
  line-height: 1;
}
.shelf-upload-btn:disabled {
  opacity: 0.6;
  cursor: default;
}
.shelf-upload-btn .spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--border-secondary);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  vertical-align: middle;
  margin-right: 4px;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

.shelf-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.shelf-card {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 14px;
  min-height: 100px;
  padding: 14px 18px;
  background: var(--card-bg);
  border-radius: var(--card-radius-lg);
  cursor: pointer;
  position: relative;
  user-select: none;
  box-shadow: 0 1px 2px rgba(31,30,29,.03);
  transition: box-shadow var(--transition-fast, .15s), transform var(--transition-fast, .15s);
}
.shelf-card:active {
  transform: scale(.985);
  box-shadow: 0 0 0 1px rgba(0,0,0,.06);
}
@media (prefers-color-scheme: dark) {
  .shelf-card { background: rgba(255,255,255,.05); }
}

/* 左侧书封：占高约 70%，宽高比像实体书 */
.shelf-card-cover {
  flex: none;
  width: 48px;
  height: 68px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 3px 8px rgba(31,30,29,.22), inset 0 0 0 1px rgba(255,255,255,.12);
}
.shelf-card-cover-char {
  font-family: "Noto Serif SC", "Songti SC", Georgia, serif;
  font-size: 24px;
  font-weight: 600;
  color: rgba(255,255,255,.92);
  text-shadow: 0 1px 2px rgba(0,0,0,.25);
}

/* 中间文字区 */
.shelf-card-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.shelf-card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.shelf-card-author {
  font-size: 13px;
  color: var(--text-secondary);
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.shelf-card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-faint);
}

/* 右侧箭头 */
.shelf-card-chevron {
  flex: none;
  width: 20px;
  height: 20px;
  color: var(--text-faint);
}

/* auto-split card hint */
.shelf-card.auto-split {
  border: 1px dashed var(--border-secondary);
}
.shelf-card-reanalyze {
  flex: none;
  margin: 0;
  padding: 3px 8px;
  border: none;
  border-radius: 8px;
  background: var(--claude-selected-bg);
  color: var(--accent);
  font-size: 11px;
  cursor: pointer;
  transition: background var(--transition-fast, .15s);
}
.shelf-card-reanalyze:active {
  background: var(--claude-selected-bg);
}

/* long-press delete indicator */
.shelf-card.deleting {
  opacity: .5;
  transform: scale(.95);
}
.shelf-card .delete-hint {
  position: absolute;
  top: 6px;
  right: 10px;
  font-size: 12px;
  color: var(--danger);
  display: none;
}
.shelf-card.deleting .delete-hint {
  display: block;
}

/* ═══════════════════════════════════════════════════════
   Reader — Fullscreen immersive
   ═══════════════════════════════════════════════════════ */

.reader-fullscreen {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  background: var(--bg-primary-warm);
}

/* 阅读器在聊天区（桌面端）—— overlay 覆盖，不破坏聊天 DOM */
#stream.reader-mode {
  padding: 0;
  overflow: hidden;
  position: relative;
}
.reader-overlay {
  position: absolute;
  inset: 0;
  z-index: 5;
  background: var(--bg-primary-warm);
  display: flex;
  flex-direction: column;
}
.reader-overlay .reader-fullscreen {
  position: absolute;
  inset: 0;
}
#stream.reader-mode .reader-body {
  min-height: 40vh;
}

/* ── Reading area ── */
.reader-area {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  position: relative;
  padding: 20px;
}
.reader-chapter-label {
  max-width: 680px;
  margin: 0 auto 18px;
  font-size: 14px;
  color: var(--text-tertiary);
  text-align: center;
}
.reader-body {
  max-width: 680px;
  margin: 0 auto;
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, serif;
  font-size: 17px;
  line-height: 1.9;
  color: var(--text-primary);
  white-space: pre-wrap;
  word-break: break-word;
  cursor: pointer;
  min-height: 60vh;
  user-select: text;
}

/* ── Top bar ── */
.reader-top-bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: calc(env(safe-area-inset-top) + 6px) 10px 8px;
  background: linear-gradient(to bottom, var(--bg-primary-warm) 60%, transparent);
  opacity: 0;
  transform: translateY(-100%);
  transition: opacity .25s, transform .25s;
  pointer-events: none;
}
.reader-top-bar.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.reader-top-bar-right {
  display: flex;
  align-items: center;
  gap: 4px;
}
.reader-top-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: rgba(0,0,0,.04);
  color: var(--text-secondary);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .15s;
}
.reader-top-btn:active {
  background: rgba(0,0,0,.1);
}
.reader-top-btn.active {
  color: var(--accent);
}

/* ── Search box (in top bar) ── */
.reader-search-box {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  display: flex;
  gap: 8px;
  padding: 8px 12px 12px;
  background: var(--bg-primary-warm);
  border-bottom: 0.5px solid var(--border-secondary);
}
.reader-search-box input {
  flex: 1;
  height: 36px;
  padding: 0 12px;
  border-radius: 10px;
  border: 1px solid var(--border-secondary);
  background: var(--bg-card);
  font-size: 14px;
  outline: none;
}
.reader-search-box button {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: none;
  background: var(--accent);
  color: #fff;
  font-size: 16px;
  cursor: pointer;
}

/* ── Bottom bar ── */
.reader-bottom-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 8px 16px calc(env(safe-area-inset-bottom) + 8px);
  background: linear-gradient(to top, var(--bg-primary-warm) 60%, transparent);
  opacity: 0;
  transform: translateY(100%);
  transition: opacity .25s, transform .25s;
  pointer-events: none;
}
.reader-bottom-bar.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.reader-bot-btn {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: none;
  background: rgba(0,0,0,.04);
  color: var(--text-secondary);
  font-size: 17px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .15s;
}
.reader-bot-btn:active {
  background: rgba(0,0,0,.1);
}

/* ── Font panel ── */
.reader-font-panel {
  position: absolute;
  bottom: 70px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 55;
  background: var(--bg-card);
  border-radius: 14px;
  padding: 16px 20px;
  box-shadow: 0 4px 20px rgba(0,0,0,.1);
  min-width: 220px;
}
.font-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  font-size: 14px;
  color: var(--text-secondary);
}
.font-row:last-child { margin-bottom: 0; }
.font-row .font-big { font-size: 20px; }
.font-row input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
}

/* ── Browse overlay ── */
.reader-browse-overlay {
  position: absolute;
  inset: 0;
  z-index: 55;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--bg-primary-warm);
}
.reader-browse-head {
  display: flex;
  align-items: center;
  width: 100%;
  max-width: 680px;
  border-bottom: 0.5px solid var(--border-secondary);
  padding: calc(env(safe-area-inset-top) + 6px) 0 0;
  flex: none;
}
.reader-browse-tabs {
  display: flex;
  flex: 1;
}
.reader-browse-close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: transparent;
  font-size: 20px;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex: none;
  margin-right: 8px;
}
.reader-browse-close:active {
  background: rgba(0,0,0,.06);
}
.browse-tab {
  flex: 1;
  padding: 12px 0;
  border: none;
  background: transparent;
  font-size: 14px;
  color: var(--text-tertiary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color .15s, border-color .15s;
}
.browse-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 500;
}
.reader-browse-body {
  width: 100%;
  max-width: 680px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 40px;
}
.browse-extra {
  display: block;
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: 2px;
}

/* ── Search overlay ── */
.reader-search-overlay {
  position: absolute;
  inset: 0;
  z-index: 55;
  display: flex;
  flex-direction: column;
  background: var(--bg-primary-warm);
}
.reader-search-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: calc(env(safe-area-inset-top) + 10px) 14px 8px;
  font-size: 14px;
  color: var(--text-secondary);
  border-bottom: 0.5px solid var(--border-secondary);
  flex: none;
}
.reader-search-head button {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: transparent;
  font-size: 18px;
  cursor: pointer;
  color: var(--text-secondary);
}
.reader-search-body {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 12px;
}
.search-result {
  margin-bottom: 16px;
  padding: 12px;
  background: var(--card-bg);
  border-radius: var(--card-radius);
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0,0,0,.04);
}
.search-result-chapter {
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 6px;
}
.search-result-text {
  font-size: 12px;
  color: var(--text-secondary);
  font-family: "Noto Serif SC", Georgia, serif;
  white-space: pre-wrap;
  line-height: 1.6;
}
.search-empty,
.search-loading {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-tertiary);
  font-size: 14px;
}

/* ── Chapter list items (shared) ── */
.chapter-list-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 10px 14px;
  border: none;
  background: transparent;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 0.5px solid var(--border-secondary);
  line-height: 1.4;
  transition: background var(--transition-fast, .15s);
}
.chapter-list-item:active,
.chapter-list-item.active {
  background: var(--claude-selected-bg);
  color: var(--text-primary);
  font-weight: 500;
}

/* ── Chapter separator (infinite scroll) ── */
.reader-chapter-sep {
  text-align: center;
  padding: 24px 0 18px;
  font-size: 14px;
  color: var(--text-tertiary);
  font-weight: 500;
  max-width: 680px;
  margin: 0 auto;
}

/* ═══════════════════════════════════════════════════════
   Annotations
   ═══════════════════════════════════════════════════════ */

/* Highlight */
.ann-highlight {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  cursor: pointer;
  border-radius: 2px;
  padding: 0 1px;
  transition: background .15s;
}
.ann-highlight.ann-dukou {
  text-decoration-color: var(--accent);
  text-decoration-style: solid;
  background: var(--accent-muted);
}
.ann-highlight.ann-shenyou {
  /* 冷雾蓝 + 虚线 —— 与渡口的陶土实线区分（配色收口前是靛蓝，被并成暖色后分不清了） */
  text-decoration-color: #5B87B8;
  text-decoration-style: dashed;
  background: rgba(91,135,184,.14);
}
.ann-highlight:active {
  filter: brightness(.9);
}

/* Selection bubble */
.ann-bubble {
  position: fixed;
  z-index: 70;
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--bg-card);
  border-radius: 10px;
  box-shadow: 0 2px 12px rgba(0,0,0,.15);
  padding: 4px 2px;
  overflow: hidden;
}
/* 选中文本预览——安卓清选区关系统菜单后文字不再蓝，靠它确认选对了 */
.ann-bubble-text {
  max-width: 140px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 12px;
  color: var(--text-tertiary);
  padding: 0 10px;
  border-right: 1px solid var(--border-secondary);
}
.ann-bubble button {
  display: block;
  padding: 8px 16px;
  border: none;
  background: transparent;
  color: var(--accent);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border-radius: 8px;
  white-space: nowrap;
}
.ann-bubble button:active {
  background: var(--claude-selected-bg);
}
/* 两个按钮（写批注/复制）中间的分隔线 */
.ann-bubble #annCopyBtn {
  border-left: 1px solid var(--border-secondary);
  border-radius: 0 8px 8px 0;
}

/* Annotation panel — desktop: fixed right, 与书架左右对称 */
.ann-panel {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 300px;
  max-width: 85vw;
  z-index: 55;
  background: var(--bg-primary-warm);
  box-shadow: -2px 0 12px rgba(0,0,0,.08);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform .25s cubic-bezier(.2,.8,.2,1);
}
.ann-panel.show {
  transform: translateX(0);
}
@media (min-width: 768px) {
  .ann-panel {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 340px;
    max-width: 90vw;
    z-index: 310;
    border-left: 1px solid var(--border);
    box-shadow: var(--shadow-lg, 0 8px 28px rgba(31,30,29,0.10));
  }
}
.ann-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 14px 10px;
  font-size: 14px;
  font-weight: 600;
  border-bottom: 0.5px solid var(--border-secondary);
  flex: none;
}
.ann-panel-head button {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: none;
  background: transparent;
  font-size: 18px;
  cursor: pointer;
  color: var(--text-secondary);
}
.ann-panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  -webkit-overflow-scrolling: touch;
  /* 评论列表滚到底/顶时别把滚动串到背景页（否则"整个界面被顶高"） */
  overscroll-behavior: contain;
}
.ann-panel-foot {
  display: flex;
  gap: 8px;
  padding: 10px 12px calc(env(safe-area-inset-bottom, 0px) + 10px);
  border-top: 0.5px solid var(--border-secondary);
  flex: none;
}
.ann-panel-foot input {
  flex: 1;
  height: 34px;
  padding: 0 10px;
  border-radius: 8px;
  border: 1px solid var(--border-secondary);
  background: var(--bg-card);
  font-size: 13px;
  outline: none;
}
.ann-panel-foot button {
  height: 34px;
  padding: 0 14px;
  border-radius: 8px;
  border: none;
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
}

/* Annotation messages */
.ann-msg {
  margin-bottom: 10px;
  max-width: 90%;
  position: relative;
}
.ann-msg-delete {
  position: absolute;
  top: 2px;
  right: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  transition: opacity .15s;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.ann-msg:hover .ann-msg-delete {
  opacity: 1;
}
.ann-msg-delete:hover {
  background: rgba(0,0,0,.08);
  color: var(--danger);
}
.ann-msg-right {
  margin-left: auto;
  text-align: right;
}
.ann-msg-left {
  margin-right: auto;
}
.ann-msg-author {
  font-size: 11px;
  color: var(--text-tertiary);
  margin-bottom: 2px;
}
.ann-msg-content {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 12px;
  font-size: 13px;
  line-height: 1.5;
}
.ann-msg-right .ann-msg-content {
  background: var(--accent);
  color: #fff;
  border-bottom-right-radius: 4px;
}
.ann-msg-left .ann-msg-content {
  background: var(--claude-selected-bg);
  color: var(--text-primary);
  border-bottom-left-radius: 4px;
}
.ann-msg-quote {
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: 3px;
  font-style: italic;
}

/* ── Responsive annotation panel ── */
@media (max-width: 768px) {
  /* 移动端：批注改底部小卡片（sheet 风）
     必须 fixed——原来是 absolute 挂在可滚动的 reading 面板里，
     列表一滚它也跟着内容飘/把界面顶高 */
  .ann-panel {
    position: fixed;
    top: auto;
    left: 4px;
    right: 4px;
    bottom: 0;
    width: auto;
    max-width: none;
    max-height: 62dvh;
    border-radius: 22px 22px 0 0;
    border-top: 1px solid var(--border);
    box-shadow: 0 -8px 30px rgba(31,30,29,.16);
    transform: translateY(105%);
    transition: transform .3s cubic-bezier(.2,.8,.2,1);
    overscroll-behavior: contain;
  }
  .ann-panel.show {
    transform: translateY(0);
  }
  .ann-panel.dragging {
    transition: none;
  }
  .ann-sheet-handle {
    width: 40px;
    height: 5px;
    margin: 8px auto 2px;
    background: var(--border-strong);
    border-radius: 4px;
    opacity: .5;
    touch-action: none;
  }
}
@media (min-width: 769px) {
  .ann-sheet-handle { display: none; }
}

/* 搜索命中的短暂高亮 */
.search-hit-flash {
  background: rgba(217, 119, 6, .35);
  border-radius: 3px;
  transition: background .8s;
}

/* 搜索结果里的关键词高亮 */
.search-result-text mark {
  background: rgba(217, 119, 6, .28);
  color: inherit;
  border-radius: 2px;
  padding: 0 1px;
}

/* ── Empty state ──────────────────────────────────── */
.shelf-empty {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-tertiary);
  font-size: 14px;
  line-height: 1.8;
}

/* ── Responsive ───────────────────────────────────── */
@media (max-width: 768px) {
  .reader-body {
    font-size: 16px;
    line-height: 1.8;
    padding: 12px 8px;
  }
  .reader-area {
    padding: 12px 10px;
  }
  .reader-controls {
    min-width: auto;
    width: calc(100vw - 24px);
    padding: 14px 14px 18px;
  }
}