:root {
    --line-height: 1.6;
}

body { font-family: 'Helvetica', sans-serif; margin: auto; max-width: 800px; line-height: var(--line-height); background: #fff0f5; color: #333; transition: 0.3s; overflow-wrap: break-word; word-wrap: break-word; }

h1 { color: #e75480; border-bottom: 2px solid #f8c8dc; padding-bottom: 10px; padding-left: 10px;}
h2 { color: #e75480; margin-top: 40px; padding-left: 5px; } /* 與目錄第1層相同 */
h3 { color: #e85aad; margin-top: 25px; padding-left: 5px; } /* 與目錄第2層相同 */
h4 { color: #f585cc; margin-top: 15px; padding-left: 5px; } /* 與目錄第4層相同 */
p { margin: 15px 0; }
img { max-width: 100%; display: block; margin: 20px auto; }
a { color: #e75480; text-decoration: none; }
a:hover { text-decoration: underline; color: #ff69b4; }
hr { border: none; height: 2px; background: linear-gradient(to right, #f8c8dc, #e75480, #f8c8dc); margin: 30px 0; border-radius: 1px; }
/* 頭部導航容器 */
.header-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    margin-top: 5px;
}

.nav-home {
    margin: 0;
}

.nav-home a {
    font-size: 0.9em;
    color: #e75480;
    text-decoration: none;
}

.nav-home a:hover {
    color: #ff69b4;
    text-decoration: underline;
}
.nav-footer { 
    display: flex; 
    justify-content: space-between; 
    margin-top: 50px; 
    margin-bottom: 80px; 
    gap: 20px;
    flex-wrap: wrap;
}
.nav-footer a { 
    padding: 8px 12px; 
    background: linear-gradient(135deg, #e75480 0%, #ff69b4 100%); 
    color: white; 
    border-radius: 6px; 
    text-decoration: none; 
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s ease; 
    box-shadow: 0 2px 6px rgba(231, 84, 128, 0.2);
    max-width: 45%;
    text-align: center;
    word-wrap: break-word;
    line-height: 1.4;
}
.nav-footer a:hover { 
    transform: translateY(-1px); 
    box-shadow: 0 3px 8px rgba(231, 84, 128, 0.3); 
    text-decoration: none; 
}
.top-nav {
    margin: 20px 0 10px 0;
}

.top-nav-buttons {
    display: flex;
    justify-content: space-between;
    gap: 15px;
    margin-bottom: 20px;
}

.top-nav-buttons a {
    padding: 8px 12px;
    background: linear-gradient(135deg, #e75480 0%, #ff69b4 100%);
    color: white;
    border-radius: 6px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 2px 6px rgba(231, 84, 128, 0.2);
    max-width: 45%;
    text-align: center;
    word-wrap: break-word;
}

.top-nav-buttons a:hover {
    transform: translateY(-1px);
    box-shadow: 0 3px 8px rgba(231, 84, 128, 0.3);
    text-decoration: none;
}

.toc { 
    margin: 20px 0; 
    line-height: 1.4 !important; /* 固定行距，不受全局調整影響 */
}

/* 第一層：主章節 - 大字體粗體 */
.toc > ul > li { 
    font-size: 1.1em; 
    font-weight: 600; 
    margin-bottom: 8px;
    line-height: 1.4 !important; /* 固定行距 */
}
.toc > ul > li > a { 
    color: #e75480; /* 與側邊欄風格統一 */
    font-weight: 600;
}

/* 第二層：子章節 - 中等字體 */
.toc ul ul > li { 
    font-size: 1.0em; 
    font-weight: 500; 
    margin-bottom: 6px;
    line-height: 1.3 !important; /* 固定行距 */
}
.toc ul ul > li > a { 
    color: #e85aad; /* 與側邊欄風格統一 */
    font-weight: 500;
}

/* 第三層：具體條目 - 小字體正常 */
.toc ul ul ul > li { 
    font-size: 0.95em; 
    font-weight: 400; 
    margin-bottom: 4px;
    line-height: 1.2 !important; /* 固定行距 */
}
.toc ul ul ul > li > a { 
    color: #f06bbf; /* 與側邊欄風格統一 */
    font-weight: 400;
}

/* 首页目录样式 - 保持原始缩进以确保展开图标显示正常 */
#main-toc ul { list-style: disc; padding-left: 1.5em; }
#main-toc ul ul { list-style: circle; padding-left: 0px; }
#main-toc ul ul ul { list-style: square; padding-left: 2.5em; }

/* 章节页目录样式 - 减少缩进让内容更靠左 */
#chapter-toc ul { list-style: disc; padding-left: 0.8em; }
#chapter-toc ul ul { list-style: circle; padding-left: 0px; }
#chapter-toc ul ul ul { list-style: square; padding-left: 1.8em; }

/* 問答樣式 */
.question {
    padding: 15px;
    background: #fff;
    border-radius: 8px;
    border-left: 4px solid #e75480;
    margin-bottom: 15px;
    box-shadow: 0 2px 8px rgba(231, 84, 128, 0.1);
    max-width: 100%;
    overflow-wrap: break-word;
}

.question-meta {
    margin-bottom: 10px;
    line-height: var(--line-height);
}

.question-meta .questioner {
    margin-right: 10px;
}

.questioner {
    font-weight: 600;
    color: #e75480;
    font-size: 16px;
}

.question-time {
    background: rgba(248, 200, 220, 0.3); /* 降低不透明度，更柔和 */
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 13px; /* 稍微縮小字體 */
    color: #fd7b7b; /* 更柔和的粉紅色 */
    border: 1px solid rgba(255, 142, 142, 0.15); /* 添加淡邊框增加層次 */
    font-weight: 500;
}

.question-text {
    color: #333;
    line-height: var(--line-height);
    margin: 0;
    word-wrap: break-word;
    word-break: break-all;
    overflow-wrap: break-word;
    white-space: normal;
    max-width: 100%;
}

.answer {
    padding: 15px;
    background: linear-gradient(135deg, #fff8f0 0%, #ffffff 100%);
    border-radius: 8px;
    border-left: 4px solid #ff69b4;
    margin-bottom: 15px;
    box-shadow: 0 2px 8px rgba(255, 105, 180, 0.1);
    max-width: 100%;
    overflow-wrap: break-word;
}

.answer-meta {
    margin-bottom: 10px;
    line-height: var(--line-height);
}

.answer-meta .answerer {
    margin-right: 10px;
}

.answerer {
    font-weight: 700;
    color: #ff69b4;
    font-size: 16px;
}

.answer-text {
    color: #333;
    line-height: var(--line-height);
    margin: 0;
    font-weight: 500;
    word-wrap: break-word;
    word-break: break-all;
    overflow-wrap: break-word;
    white-space: normal;
    max-width: 100%;
}

/* 暗色模式 */
body.dark-mode { background: #3b1c32; color: #fddde6; }
body.dark-mode a { color: #ff91af; }
body.dark-mode h1 { color: #ff91af; border-bottom-color: #5a2d49; }
body.dark-mode h2 { color: #ff91af; } /* 與夜間模式目錄第1層相同 */
body.dark-mode h3 { color: #ffb3c6; } /* 與夜間模式目錄第2層相同 */
body.dark-mode h4 { color: #ffd1e0; } /* 與夜間模式目錄第4層相同 */
body.dark-mode hr { background: linear-gradient(to right, #5a2d49, #ff91af, #5a2d49); }
body.dark-mode .question { background: #4a2c3a; border-left-color: #ff91af; box-shadow: 0 2px 8px rgba(255, 145, 175, 0.1); }
body.dark-mode .question-text { color: #fddde6; }
body.dark-mode .questioner { color: #ff91af; }
body.dark-mode .question-time { 
    background: rgba(90, 45, 73, 0.4); /* 降低不透明度 */
    color: #d4a5b8; /* 更柔和的粉紅色，減少螢光感 */
    border: 1px solid rgba(255, 105, 180, 0.2); /* 淡邊框 */
}
body.dark-mode .answer { background: linear-gradient(135deg, #4a2c3a 0%, #3b1c32 100%); border-left-color: #ff69b4; }
body.dark-mode .answer-text { color: #fddde6; }
body.dark-mode .answerer { color: #ff69b4; }

/* 暗色模式下的导航按钮 */
body.dark-mode .nav-footer a { 
    background: linear-gradient(135deg, #5a2d49 0%, #ff69b4 100%); 
    color: #fddde6;
    box-shadow: 0 2px 6px rgba(90, 45, 73, 0.3);
}
body.dark-mode .nav-footer a:hover { 
    box-shadow: 0 3px 8px rgba(90, 45, 73, 0.5); 
}
body.dark-mode .top-nav-buttons a {
    background: linear-gradient(135deg, #5a2d49 0%, #ff69b4 100%);
    color: #fddde6;
    box-shadow: 0 2px 6px rgba(90, 45, 73, 0.3);
}
body.dark-mode .top-nav-buttons a:hover {
    box-shadow: 0 3px 8px rgba(90, 45, 73, 0.5);
}
body.dark-mode .back-to-top a { 
    color: #ff91af; 
    /* 暗色模式下🔝符號的text-shadow效果 */
    text-shadow: 0 0 3px rgba(255, 105, 180, 0.4), 0 0 6px rgba(255, 105, 180, 0.2);
}
body.dark-mode .back-to-top a:hover { 
    color: #ff69b4; 
    /* 暗色模式hover時增強text-shadow效果 */
    text-shadow: 0 0 4px rgba(255, 105, 180, 0.6), 0 0 8px rgba(255, 105, 180, 0.4);
}
body.dark-mode .lang-switch a { color: #ff91af; }
body.dark-mode .lang-switch a:hover { color: #ff69b4; }
body.dark-mode .nav-home a { color: #ff91af; }
body.dark-mode .nav-home a:hover { color: #ff69b4; }

/* 首頁頭部樣式 */
.index-header {
    justify-content: flex-end;
}

/* 夜間模式按鈕已移至閱讀設置中 */
.back-to-top { text-align: right; margin: 20px 0; }
.back-to-top a { 
    font-size: 0.9em; 
    color: #d44d75; 
    /* 為🔝符號添加粉紅色text-shadow效果 */
    text-shadow: 0 0 3px rgba(231, 84, 128, 0.3), 0 0 6px rgba(231, 84, 128, 0.2);
}
.back-to-top a:hover { 
    color: #ff69b4; 
    /* hover時增強text-shadow效果 */
    text-shadow: 0 0 4px rgba(231, 84, 128, 0.5), 0 0 8px rgba(231, 84, 128, 0.3);
}
.lang-switch { 
    text-align: right; 
    margin: 0;
}
.lang-switch a { font-size: 0.9em; margin: 0 5px; }

/* ============ UX 增強功能 ============ */

/* 閱讀工具欄 */
.reading-toolbar {
    position: fixed;
    top: 70px;
    right: 20px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border: 1px solid #e0e0e0;
    border-radius: 12px;
    padding: 15px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    z-index: 980; /* 降低z-index，确保低于action-menu-items */
    transition: transform 0.3s ease, opacity 0.3s ease;
    /* 添加滚动条支持，防止内容溢出 */
    max-height: calc(100vh - 140px); /* 视窗高度 - 顶部偏移 - 底部安全距离 */
    overflow-y: auto;
}

/* 閱讀工具欄滾動條樣式 */
.reading-toolbar::-webkit-scrollbar {
    width: 6px;
}

.reading-toolbar::-webkit-scrollbar-track {
    background: rgba(240, 240, 240, 0.3);
    border-radius: 3px;
}

.reading-toolbar::-webkit-scrollbar-thumb {
    background: rgba(231, 84, 128, 0.4);
    border-radius: 3px;
    transition: background 0.2s ease;
}

.reading-toolbar::-webkit-scrollbar-thumb:hover {
    background: rgba(231, 84, 128, 0.6);
}

.reading-toolbar.hidden {
    transform: translateX(100%);
    opacity: 0;
}

.toolbar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid #f0f0f0;
    font-size: 14px;
    font-weight: 600;
    color: #e75480;
}

.toolbar-section {
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid #f0f0f0;
}

.toolbar-section:last-child {
    margin-bottom: 0;
    border-bottom: none;
}

.toolbar-label {
    font-size: 12px;
    color: #666;
    margin-bottom: 5px;
    font-weight: 500;
    display: flex;
    justify-content: space-between;
    align-items: center;
}



.toolbar-controls {
    display: flex;
    gap: 8px; /* 增加按钮间距，防止误点 */
    align-items: center;
}

.ctrl-btn {
    padding: 6px 10px;
    border: 1px solid #ddd;
    background: #fff;
    border-radius: 6px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.2s ease;
    min-width: 30px;
    text-align: center;
}

.ctrl-btn:hover {
    background: #f5f5f5;
    border-color: #ccc;
}

.ctrl-btn.active {
    background: #e75480;
    color: white;
    border-color: #e75480;
}

/* 字體調整按鈕特殊樣式 - 區別於選項按鈕 */
.ctrl-btn.font-adjust {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border: 1px solid #ced4da;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    min-width: 32px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 600;
    color: #495057;
    transition: all 0.2s ease;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.ctrl-btn.font-adjust:hover {
    background: linear-gradient(135deg, #e9ecef 0%, #dee2e6 100%);
    border-color: #adb5bd;
    transform: translateY(-1px);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
    color: #212529;
}

.ctrl-btn.font-adjust:active {
    transform: translateY(0);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    background: linear-gradient(135deg, #dee2e6 0%, #ced4da 100%);
}

/* 字體調整按鈕的短暫反馈效果 */
.ctrl-btn.font-adjust.clicked {
    background: linear-gradient(135deg, #e75480 0%, #c73650 100%);
    color: white;
    border-color: #e75480;
    transform: scale(0.95);
}

/* 字體大小選項按鈕優化樣式 */
.ctrl-btn.font-option {
    /* 為"預設"按鈕增加更多padding，確保舒適的點擊區域 */
    padding: 6px 16px; /* 左右增加padding */
    min-width: 50px; /* 設置最小寬度確保視覺平衡 */
    position: relative;
    white-space: nowrap; /* 防止文字換行 */
}

/* 搜索功能已移除 */

/* 閱讀進度條 */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: rgba(231, 84, 128, 0.2);
    z-index: 9999;
}

.reading-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #e75480, #ff69b4);
    width: 0%;
    transition: width 0.1s ease;
}

/* 浮動目錄 */
.floating-toc {
    position: fixed;
    left: -250px;
    top: 50%;
    transform: translateY(-50%);
    width: 240px;
    max-height: 70vh;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border: 1px solid #e0e0e0;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    z-index: 800;
    transition: left 0.3s ease;
    display: flex;
    flex-direction: column;
}

.floating-toc.visible {
    left: 20px;
}

.floating-toc-header {
    padding: 15px;
    border-bottom: 1px solid #f0f0f0;
    font-weight: 600;
    color: #e75480;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 12px 12px 0 0;
    flex-shrink: 0;
}

.floating-toc-content {
    flex: 1;
    overflow-y: auto;
    padding: 0;
    line-height: 1.4 !important; /* 固定行距，不受全局調整影響 */
    overflow-x: hidden; /* 防止水平滚动条 */
}

.floating-toc-list {
    padding: 10px;
    list-style: none;
}

.floating-toc-item {
    padding: 8px 12px;
    margin: 2px 0;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 13px;
    border-left: 3px solid transparent;
    line-height: 1.3 !important; /* 修正行距，避免重叠 */
    word-wrap: break-word; /* 自动换行 */
    white-space: normal; /* 允许换行 */
    overflow-wrap: break-word; /* 强制长单词换行 */
    color: #e75480; /* 與章節頁面目錄第1層相同 */
}

.floating-toc-item.level-h3 {
    padding-left: 24px;
    font-size: 12px;
    color: #e85aad; /* 與章節頁面目錄第2層相同 */
    line-height: 1.3 !important; /* 确保子级别也有正确行距 */
    word-wrap: break-word;
    white-space: normal;
    overflow-wrap: break-word;
}

.floating-toc-item.level-h4 {
    padding-left: 36px;
    font-size: 11px;
    color: #f585cc; /* 與章節頁面目錄第4層相同 */
    line-height: 1.3 !important; /* 确保子级别也有正确行距 */
    word-wrap: break-word;
    white-space: normal;
    overflow-wrap: break-word;
}

.floating-toc-item.level-h5 {
    padding-left: 48px;
    font-size: 10px;
    color: #f585cc; /* 與章節頁面目錄第4層相同 */
    line-height: 1.3 !important; /* 确保子级别也有正确行距 */
    word-wrap: break-word;
    white-space: normal;
    overflow-wrap: break-word;
}

.floating-toc-item:hover {
    background: rgba(231, 84, 128, 0.1);
}

.floating-toc-item.active {
    background: rgba(231, 84, 128, 0.2);
    border-left-color: #e75480;
    font-weight: 600;
    color: #e75480;
    border-radius: 4px;
    transform: translateX(2px);
    box-shadow: 0 1px 4px rgba(231, 84, 128, 0.3);
}

/* 浮動目錄標籤頁 */
.floating-toc-tabs {
    display: flex;
    border-bottom: 1px solid #f0f0f0;
}

.floating-toc-tab {
    flex: 1;
    padding: 10px;
    text-align: center;
    cursor: pointer;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
    font-size: 12px;
    transform-origin: center;
}

.floating-toc-tab.active {
    color: #e75480;
    border-bottom-color: #e75480;
    font-weight: 600;
}

.floating-toc-tab:hover {
    background: rgba(231, 84, 128, 0.05);
}

/* 書籤樣式 */
.bookmark-item {
    padding: 10px 12px;
    margin: 4px 0;
    border-radius: 6px;
    border: 1px solid #f0f0f0;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    word-wrap: break-word; /* 书签文本自动换行 */
    white-space: normal;
    overflow-wrap: break-word;
    line-height: 1.4; /* 合理的行距 */
}

.bookmark-item:hover {
    background: rgba(231, 84, 128, 0.05);
    border-color: #e75480;
}

.qa-pair-bookmark {
    border-left: 3px solid #ff69b4;
    background: linear-gradient(135deg, rgba(255, 105, 180, 0.08) 0%, rgba(255, 255, 255, 0.5) 100%);
}

.qa-pair-bookmark:hover {
    background: linear-gradient(135deg, rgba(255, 105, 180, 0.12) 0%, rgba(231, 84, 128, 0.05) 100%);
}

.bookmark-meta {
    display: flex;
    align-items: center;
    margin-bottom: 5px;
    font-size: 11px;
    color: #666;
    gap: 6px;
}

.bookmark-type {
    font-size: 12px;
    flex-shrink: 0;
}

.bookmark-questioner {
    font-weight: 600;
    color: #e75480;
    flex: 1;
}

.bookmark-time {
    font-size: 10px;
    flex-shrink: 0;
    color: #b18a9e; /* 柔和的粉紅灰色，與主題協調 */
    opacity: 0.8; /* 稍微降低顯眼度 */
}

/* 首頁書籤樣式 */
.bookmark-chapter-group {
  margin-bottom: 15px;
  border-bottom: 1px solid #eee;
  padding-bottom: 10px;
  line-height: 1.4 !important; /* 固定行距 */
  list-style: none;
}

.bookmark-chapter-title {
  font-weight: 600;
  color: #d44d75;
  font-size: 0.95em;
  margin-bottom: 8px;
  padding: 5px 0;
  border-bottom: 1px solid #f8c8dc;
  line-height: 1.4 !important; /* 固定行距 */
  cursor: default !important; /* 確保不顯示為可點擊狀態 */
  word-wrap: break-word; /* 章节标题自动换行 */
  white-space: normal;
  overflow-wrap: break-word;
}

.bookmark-chapter-list {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.bookmark-chapter-list .bookmark-item {
  margin-bottom: 8px;
  padding: 8px;
  background: #fafafa;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s;
  line-height: 1.4 !important; /* 固定行距 */
  list-style: none;
  position: relative; /* 為bookmark-delete按鈕定位 */
}

.bookmark-chapter-list .bookmark-item:hover {
  background: #f0f0f0;
}

.bookmark-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 4px 0;
}

.bookmark-remove {
  background: none;
  border: none;
  color: #e75480;
  cursor: pointer;
  font-size: 0.8em;
  padding: 2px 6px;
  border-radius: 3px;
  transition: background-color 0.2s;
}

.bookmark-remove:hover {
  background: #ffe0e6;
}

.bookmark-preview {
    font-size: 12px;
    color: #333;
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.bookmark-preview a {
    text-decoration: none;
    color: inherit;
}

.bookmark-preview a:hover {
    text-decoration: none;
    color: #e75480;
}

.bookmark-delete {
    position: absolute;
    top: 5px;
    right: 5px;
    background: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    cursor: pointer;
    font-size: 10px;
    color: #999;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.bookmark-item:hover .bookmark-delete {
    opacity: 1;
}

.bookmark-delete:hover {
    background: #ff4757;
    color: white;
}

.bookmarks-empty {
    text-align: center;
    padding: 20px;
    color: #999;
    font-size: 12px;
}

/* 操作按鈕組 - 可展開菜單 */
.action-buttons {
    position: fixed;
    bottom: 30px;
    right: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    z-index: 1000;
}

.action-menu {
    position: relative;
}

.action-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    background: #ff69b4;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    box-shadow: 0 4px 15px rgba(255, 105, 180, 0.3);
    transition: all 0.3s ease;
}

.action-btn:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 6px 20px rgba(255, 105, 180, 0.4);
}

.action-btn.menu-btn {
    background: #ff69b4;
    z-index: 1001;
}

.action-btn.menu-btn.expanded {
    transform: rotate(90deg);
    background: #e75480;
}

.action-menu-items {
    position: absolute;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    gap: 10px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    pointer-events: none;
    z-index: 1000; /* 确保action-menu-items高于reading-toolbar */
}

.action-menu.expanded .action-menu-items {
    opacity: 1;
    visibility: visible;
    pointer-events: all;
}

.action-menu-items .action-btn {
    width: 45px;
    height: 45px;
    font-size: 16px;
    background: #ff69b4;
    transform: scale(0.8);
}

.action-menu.expanded .action-menu-items .action-btn {
    transform: scale(1);
}

.action-menu-items .action-btn:hover {
    background: #e75480;
    transform: scale(1.05);
}

/* 暗色模式適配 */
body.dark-mode .action-btn {
    background: #ff69b4;
    box-shadow: 0 4px 15px rgba(255, 105, 180, 0.4);
}

body.dark-mode .action-btn:hover {
    background: #e75480;
    box-shadow: 0 6px 20px rgba(255, 105, 180, 0.5);
}

body.dark-mode .action-btn.menu-btn.expanded {
    background: #e75480;
}

body.dark-mode .action-menu-items .action-btn {
    background: #ff69b4;
}

body.dark-mode .action-menu-items .action-btn:hover {
    background: #e75480;
}

/* 問答互動功能 */
.qa-actions {
    position: absolute;
    top: 10px;
    right: 10px;
    display: flex;
    gap: 8px;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.question:hover .qa-actions,
.answer:hover .qa-actions {
    opacity: 1;
}

.qa-btn {
    width: 28px;
    height: 28px;
    border: none;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: #666;
    transition: all 0.2s ease;
}

.qa-btn:hover {
    background: #e75480;
    color: white;
    transform: scale(1.1);
}

/* 通知消息 */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #333;
    color: white;
    padding: 12px 20px;
    border-radius: 25px;
    font-size: 14px;
    z-index: 9999;
    transition: transform 0.3s ease;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

/* 暗色模式適配 */
body.dark-mode .reading-toolbar,
body.dark-mode .floating-toc {
    background: rgba(59, 28, 50, 0.95);
    border-color: #5a2d49;
}

/* 浮動目錄滾動條樣式 */
.floating-toc-content::-webkit-scrollbar {
    width: 6px;
}

.floating-toc-content::-webkit-scrollbar-track {
    background: rgba(240, 240, 240, 0.3);
    border-radius: 3px;
}

.floating-toc-content::-webkit-scrollbar-thumb {
    background: rgba(231, 84, 128, 0.4);
    border-radius: 3px;
    transition: background 0.2s ease;
}

.floating-toc-content::-webkit-scrollbar-thumb:hover {
    background: rgba(231, 84, 128, 0.6);
}

/* 暗色模式滾動條樣式 */
body.dark-mode .reading-toolbar::-webkit-scrollbar-track {
    background: rgba(90, 45, 73, 0.3);
}

body.dark-mode .reading-toolbar::-webkit-scrollbar-thumb {
    background: rgba(255, 105, 180, 0.4);
}

body.dark-mode .reading-toolbar::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 105, 180, 0.6);
}

/* 暗色模式浮動目錄滾動條樣式 */
body.dark-mode .floating-toc-content::-webkit-scrollbar-track {
    background: rgba(90, 45, 73, 0.3);
}

body.dark-mode .floating-toc-content::-webkit-scrollbar-thumb {
    background: rgba(255, 105, 180, 0.4);
}

body.dark-mode .floating-toc-content::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 105, 180, 0.6);
}

body.dark-mode .floating-toc-header {
    background: rgba(59, 28, 50, 0.95);
    border-bottom: 1px solid #5a2d49;
}

body.dark-mode .ctrl-btn,
body.dark-mode .qa-btn {
    background: rgba(90, 45, 73, 0.9);
    color: #fddde6;
    border-color: #5a2d49;
}

body.dark-mode .ctrl-btn:hover,
body.dark-mode .qa-btn:hover {
    background: #ff69b4;
}

body.dark-mode .ctrl-btn.active {
    background: #ff69b4;
    color: #fff;
    border-color: #ff69b4;
    box-shadow: 0 0 8px rgba(255, 105, 180, 0.5);
}

/* 暗色模式下的字體調整按鈕 */
body.dark-mode .ctrl-btn.font-adjust {
    background: linear-gradient(135deg, #3a3a3a 0%, #2d2d2d 100%);
    border: 1px solid #555;
    color: #fddde6;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

body.dark-mode .ctrl-btn.font-adjust:hover {
    background: linear-gradient(135deg, #4a4a4a 0%, #3a3a3a 100%);
    border-color: #777;
    color: #fff;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

body.dark-mode .ctrl-btn.font-adjust:active {
    background: linear-gradient(135deg, #2d2d2d 0%, #1a1a1a 100%);
}

body.dark-mode .ctrl-btn.font-adjust.clicked {
    background: linear-gradient(135deg, #ff69b4 0%, #d63384 100%);
    color: white;
    border-color: #ff69b4;
}





body.dark-mode .floating-toc-item:hover {
    background: rgba(255, 105, 180, 0.2);
}

body.dark-mode .floating-toc-item.active {
    background: rgba(255, 105, 180, 0.25);
    border-left-color: #ff69b4;
    color: #ff69b4;
    box-shadow: 0 1px 4px rgba(255, 105, 180, 0.4);
}

/* 書籤視覺標識 */
.bookmarked {
    position: relative;
    background: linear-gradient(135deg, rgba(255, 105, 180, 0.1) 0%, rgba(255, 182, 193, 0.1) 100%);
    border-left: 4px solid #ff69b4;
    box-shadow: 0 2px 8px rgba(255, 105, 180, 0.2);
}

.bookmark-indicator {
    position: absolute;
    bottom: 8px;
    right: 8px;
    font-size: 16px;
    opacity: 0.8;
    z-index: 10;
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
}

.bookmark-indicator:hover {
    opacity: 1;
    transform: scale(1.1);
}

body.dark-mode .bookmarked {
    background: linear-gradient(135deg, rgba(255, 105, 180, 0.15) 0%, rgba(139, 69, 19, 0.1) 100%);
    border-left-color: #ff69b4;
    box-shadow: 0 2px 8px rgba(255, 105, 180, 0.3);
}

/* 書籤分組樣式 */
.bookmark-chapter {
    margin: 12px 0 8px 0;
    padding: 8px 12px;
    background: rgba(231, 84, 128, 0.1);
    border-radius: 6px;
    border-left: 4px solid #e75480;
}

.bookmark-chapter-title {
    font-weight: 600;
    color: #e75480;
    font-size: 14px;
    margin: 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.bookmark-chapter-toggle {
    font-size: 12px;
    transition: transform 0.2s ease;
}

.bookmark-chapter.collapsed .bookmark-chapter-toggle {
    transform: rotate(-90deg);
}

.bookmark-chapter-items {
    margin-top: 8px;
    transition: max-height 0.2s ease;
    overflow: hidden;
}

.bookmark-chapter.collapsed .bookmark-chapter-items {
    max-height: 0;
    margin-top: 0;
}

.bookmark-chapter-count {
    font-size: 12px;
    background: rgba(231, 84, 128, 0.2);
    padding: 2px 6px;
    border-radius: 10px;
    color: #e75480;
}

body.dark-mode .bookmark-chapter {
    background: rgba(255, 105, 180, 0.15);
    border-left-color: #ff69b4;
}

body.dark-mode .bookmark-chapter-title {
    color: #ff69b4;
}

body.dark-mode .bookmark-chapter-count {
    background: rgba(255, 105, 180, 0.3);
    color: #ff69b4;
}

/* 夜間模式下標籤頁樣式 */
body.dark-mode .floating-toc-tab {
    color: #fddde6;
    border-bottom: 1px solid #5a2d49;
}

body.dark-mode .floating-toc-tab.active {
    color: #ff69b4;
    border-bottom-color: #ff69b4;
}

body.dark-mode .floating-toc-tab:hover {
    background: rgba(255, 105, 180, 0.1);
}

/* 當前章節信息樣式 */
.current-chapter-info {
    padding: 8px 12px;
    margin-bottom: 12px;
    background: rgba(231, 84, 128, 0.1);
    border-radius: 6px;
    border-left: 4px solid #e75480;
}

.chapter-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0;
}

.current-chapter-title {
    font-size: 14px;
    font-weight: 600;
    color: #e75480;
    flex: 1;
}

.current-chapter-count {
    font-size: 12px;
    color: #666;
}

.bookmark-clear-icon {
    background: none;
    border: none;
    font-size: 16px;
    cursor: pointer;
    opacity: 0;
    transition: all 0.3s ease;
    padding: 3px;
    border-radius: 3px;
    position: relative;
}

.current-chapter-info:hover .bookmark-clear-icon {
    opacity: 0.7;
}

.bookmark-clear-icon:hover {
    opacity: 1 !important;
    background: rgba(255, 71, 87, 0.1);
    transform: scale(1.05);
}

.bookmark-clear-icon:hover::after {
    content: '清空書籤';
    position: absolute;
    top: -30px;
    right: 0;
    background: #333;
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 11px;
    white-space: nowrap;
    z-index: 1000;
}

.bookmark-clear-icon:active {
    transform: scale(0.95);
}

body.dark-mode .current-chapter-info {
    background: rgba(255, 105, 180, 0.15);
    border-left-color: #ff69b4;
}

body.dark-mode .current-chapter-title {
    color: #ff69b4;
}

body.dark-mode .current-chapter-count {
    color: #fddde6;
}

body.dark-mode .current-chapter-info:hover .bookmark-clear-icon {
    opacity: 0.7;
}

body.dark-mode .bookmark-clear-icon:hover {
    background: rgba(255, 105, 180, 0.2) !important;
    opacity: 1 !important;
}

body.dark-mode .bookmark-clear-icon:hover::after {
    background: #5a2d49;
    color: #fddde6;
}

body.dark-mode .qa-pair-bookmark {
    border-left-color: #ff69b4;
    background: linear-gradient(135deg, rgba(255, 105, 180, 0.15) 0%, rgba(59, 28, 50, 0.5) 100%);
}

body.dark-mode .qa-pair-bookmark:hover {
    background: linear-gradient(135deg, rgba(255, 105, 180, 0.2) 0%, rgba(255, 105, 180, 0.1) 100%);
}

/* ============ 搜索激活按钮样式 ============ */
.search-activation {
    margin: 30px 0;
    text-align: center;
}

.search-activate-btn {
    background: linear-gradient(135deg, #e75480 0%, #ff69b4 100%);
    color: white;
    border: none;
    padding: 10px 30px;
    border-radius: 25px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(231, 84, 128, 0.3);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.search-activate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(231, 84, 128, 0.4);
    background: linear-gradient(135deg, #ff69b4 0%, #e75480 100%);
}

.search-activate-btn:active {
    transform: translateY(0);
}

.search-activate-btn:disabled {
    background: #ddd !important;
    color: #999 !important;
    cursor: not-allowed !important;
    box-shadow: none !important;
    transform: none !important;
}

.search-activate-hint {
    display: block;
    font-size: 12px;
    font-weight: normal;
    opacity: 0.9;
    margin-top: 4px;
}

/* ============ 搜索功能样式 ============ */
.search-container {
    margin: 30px 0;
    padding: 20px;
    background: linear-gradient(135deg, #fff8f5 0%, #ffffff 100%);
    border-radius: 12px;
    border: 1px solid #f8c8dc;
    box-shadow: 0 4px 12px rgba(231, 84, 128, 0.1);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.search-box {
    position: relative;
    margin-bottom: 15px;
}

#search-input {
    width: 100%;
    padding: 12px 20px;
    font-size: 16px;
    border: 2px solid #f8c8dc;
    border-radius: 25px;
    background: #fff;
    color: #333;
    box-sizing: border-box;
    transition: all 0.3s ease;
    outline: none;
}

#search-input:focus {
    border-color: #e75480;
    box-shadow: 0 0 0 3px rgba(231, 84, 128, 0.1);
}

#search-input:disabled {
    background-color: #f5f5f5;
    color: #999;
    cursor: not-allowed;
    border-color: #ddd;
    box-shadow: none;
}

#search-input::placeholder {
    color: #999;
}

.search-status {
    margin-top: 8px;
    font-size: 14px;
    color: #666;
    min-height: 20px;
}

/* 搜索載入進度樣式 */
.search-loading {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    background: #f9f9f9;
    border-radius: 6px;
    border: 1px solid #e0e0e0;
}

.search-loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid #e75480;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.search-loading-text {
    color: #666;
    font-size: 14px;
}

/* 搜索進度條 */
.search-progress-container {
    padding: 20px;
    text-align: center;
}

.search-progress-bar {
    width: 100%;
    height: 8px;
    background-color: #e0e0e0;
    border-radius: 4px;
    margin: 10px 0;
    overflow: hidden;
}

.search-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #4CAF50, #45a049);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.search-progress-text {
    font-size: 12px;
    color: #888;
    margin-top: 5px;
}



.search-error {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    background: #fff5f5;
    border: 1px solid #fed7d7;
    border-radius: 6px;
    color: #c53030;
}

.search-retry-btn {
    background: #e75480;
    color: white;
    border: none;
    padding: 4px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    transition: background 0.2s;
}

.search-retry-btn:hover {
    background: #d63384;
}

.search-status-success {
    color: #2d7d32;
    font-weight: 500;
    padding: 8px 12px;
    background: #f1f8e9;
    border: 1px solid #c8e6c9;
    border-radius: 6px;
}

.search-results {
    margin-top: 20px;
}

.search-results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid #f8c8dc;
    flex-wrap: wrap;
    gap: 10px;
}

.search-results-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.search-results-count {
    font-weight: 600;
    color: #e75480;
}

.search-clear, .search-collapse, .search-load-more, .search-load-all {
    background: #f8c8dc;
    color: #b73c65;
    border: none;
    padding: 6px 12px;
    border-radius: 15px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.3s ease;
}

.search-clear:hover, .search-collapse:hover, .search-load-more:hover, .search-load-all:hover {
    background: #e75480;
    color: white;
}

.search-collapse {
    background: #e0e0e0;
    color: #666;
}

.search-collapse:hover {
    background: #999;
    color: white;
}

.search-load-more {
    background: #e6f3ff;
    color: #0066cc;
}

.search-load-more:hover {
    background: #0066cc;
    color: white;
}

.search-load-all {
    background: #e8f5e8;
    color: #006600;
}

.search-load-all:hover {
    background: #006600;
    color: white;
}

.search-results-list {
    list-style: none;
    padding: 0;
    margin: 0;
    overflow-y: visible;
    /* 移除高度限制，顯示所有搜尋結果 */
    max-height: none;
}

.search-result-item {
    margin-bottom: 12px;
    padding: 15px;
    background: #fff;
    border-radius: 8px;
    border-left: 3px solid #e75480;
    box-shadow: 0 2px 6px rgba(231, 84, 128, 0.1);
    cursor: pointer;
    transition: all 0.3s ease;
}

.search-result-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(231, 84, 128, 0.15);
    border-left-color: #ff69b4;
}



.search-result-title {
    font-weight: 600;
    color: #e75480;
    margin-bottom: 8px;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}



.search-result-type {
    white-space: nowrap;
    display: inline-block;
    background: #f8c8dc;
    color: #b73c65;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    margin-right: 8px;
}

.search-result-content {
    color: #555;
    font-size: 14px;
    line-height: 1.5;
    margin: 8px 0;
}

.search-result-highlight {
    background: linear-gradient(120deg, #ffeb3b 0%, #ffc107 100%);
    padding: 1px 2px;
    border-radius: 2px;
    font-weight: 600;
}





/* 暗色模式搜索样式 */
body.dark-mode .search-activate-btn {
    background: linear-gradient(135deg, #ff69b4 0%, #e75480 100%);
    box-shadow: 0 4px 15px rgba(255, 105, 180, 0.4);
}

body.dark-mode .search-activate-btn:hover {
    background: linear-gradient(135deg, #e75480 0%, #ff69b4 100%);
    box-shadow: 0 6px 20px rgba(255, 105, 180, 0.5);
}

body.dark-mode .search-activate-btn:disabled {
    background: #444 !important;
    color: #666 !important;
    cursor: not-allowed !important;
    box-shadow: none !important;
    transform: none !important;
}

body.dark-mode #search-input:disabled {
    background-color: #333;
    color: #666;
    border-color: #555;
}

body.dark-mode .search-container {
    background: linear-gradient(135deg, #2d1e2e 0%, #1a1a1a 100%);
    border-color: #4a2c4a;
}

body.dark-mode #search-input {
    background: #2d1e2e;
    color: #fff;
    border-color: #4a2c4a;
}

body.dark-mode #search-input::placeholder {
    color: #ccc;
}

body.dark-mode #search-input:focus {
    border-color: #ff69b4;
    box-shadow: 0 0 0 3px rgba(255, 105, 180, 0.2);
}

body.dark-mode .search-results-header {
    border-bottom-color: #4a2c4a;
}

/* 搜索加載狀態夜間模式 */
body.dark-mode .search-loading {
    background: #2d1e2e;
    border-color: #4a2c4a;
}

body.dark-mode .search-loading-text {
    color: #fddde6;
}

/* 暗色模式下的搜索進度條 */
body.dark-mode .search-progress-bar {
    background-color: #444;
}

body.dark-mode .search-progress-text {
    color: #ccc;
}

body.dark-mode .search-loading-spinner {
    border-color: #4a2c4a;
    border-top-color: #ff69b4;
}

/* 搜索錯誤狀態夜間模式 */
body.dark-mode .search-error {
    background: #4a2c3a;
    border-color: #5a2d49;
    color: #ff91af;
}

body.dark-mode .search-retry-btn {
    background: #ff69b4;
    color: #fff;
}

body.dark-mode .search-retry-btn:hover {
    background: #ff91af;
}

/* 搜索成功狀態夜間模式 */
body.dark-mode .search-status-success {
    background: #2d4a2d;
    border-color: #4a6b4a;
    color: #a8d5aa;
}

body.dark-mode .search-result-item {
    background: #2d1e2e;
    border-left-color: #ff69b4;
}

body.dark-mode .search-result-content {
    color: #ccc;
}



body.dark-mode .search-clear, body.dark-mode .search-collapse, 
body.dark-mode .search-load-more, body.dark-mode .search-load-all {
    background: #4a2c4a;
    color: #ff69b4;
}

body.dark-mode .search-clear:hover, body.dark-mode .search-collapse:hover,
body.dark-mode .search-load-more:hover, body.dark-mode .search-load-all:hover {
    background: #ff69b4;
    color: #1a1a1a;
}

body.dark-mode .search-collapse {
    background: #333;
    color: #ccc;
}

body.dark-mode .search-collapse:hover {
    background: #555;
    color: #fff;
}

body.dark-mode .search-load-more {
    background: #1a2a3a;
    color: #66ccff;
}

body.dark-mode .search-load-more:hover {
    background: #66ccff;
    color: #1a1a1a;
}

body.dark-mode .search-load-all {
    background: #1a3a1a;
    color: #66ff66;
}

body.dark-mode .search-load-all:hover {
    background: #66ff66;
    color: #1a1a1a;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .search-activate-btn {
        padding: 12px 24px;
        font-size: 14px;
    }
    
    .search-activate-hint {
        font-size: 11px;
    }
    
    .search-container {
        margin: 20px 0;
        padding: 15px;
    }
    
    #search-input {
        font-size: 16px; /* 防止iOS缩放 */
    }
    
    .search-results-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .search-results-actions {
        width: 100%;
        justify-content: flex-start;
    }
    
    .search-clear, .search-collapse, .search-load-more, .search-load-all {
        font-size: 11px;
        padding: 5px 10px;
    }
    
    .search-result-item {
        padding: 12px;
    }
    
    .search-result-title {
        align-items: flex-start;
        gap: 4px;
    }
    
    /* 基礎字型大小調整 - 平板 */
    /* 移除!important，让JavaScript动态字体调整生效 */
    body {
        line-height: 1.7;
    }
    
    /* 平板端字體控制按鈕優化 */
    .toolbar-controls {
        gap: 10px; /* 平板端增加更多間距 */
    }
    
    .ctrl-btn.font-option {
        padding: 8px 18px; /* 平板端增加更多padding */
        min-width: 55px;
    }
    
    /* TOC目錄字型優化 - 平板 */
    /* 移除!important，让JavaScript动态字体调整生效 */
    .toc > ul > li { 
        margin-bottom: 10px;
        /* 字體大小和行距由JavaScript動態設置 */
    }
    
    .toc ul ul > li { 
        margin-bottom: 8px;
        /* 字體大小和行距由JavaScript動態設置 */
    }
    
    .toc ul ul ul > li { 
        margin-bottom: 6px;
        /* 字體大小和行距由JavaScript動態設置 */
    }
    
    .toc ul ul ul ul > li { 
        margin-bottom: 5px;
        /* 字體大小和行距由JavaScript動態設置 */
    }
    
    /* 章節頁TOC優化 */
    /* 移除!important，让JavaScript动态字体调整生效 */
    .toc-item.toc-level-1 > a {
        /* 字體大小和行距由JavaScript動態設置 */
        /* 保留此規則作為CSS結構標記 */
        position: relative;
    }
    
    .toc-item.toc-level-2 > a {
        /* 字體大小和行距由JavaScript動態設置 */
        /* 保留此規則作為CSS結構標記 */
        position: relative;
    }
    
    .toc-item.toc-level-3 > a {
        /* 字體大小和行距由JavaScript動態設置 */
        /* 保留此規則作為CSS結構標記 */
        position: relative;
    }
    
    .toc-item.toc-level-4 > a {
        /* 字體大小和行距由JavaScript動態設置 */
        /* 保留此規則作為CSS結構標記 */
        position: relative;
    }
    
    /* 標題字型調整 */
    h1 { font-size: 26px !important; line-height: 1.3; }
    h2 { font-size: 22px !important; line-height: 1.4; }
    h3 { font-size: 20px !important; line-height: 1.4; }
    h4 { font-size: 18px !important; line-height: 1.4; }
    
    /* 按鈕和控制元素 */
    .toc-level-btn, .floating-level-btn {
        font-size: 15px !important;
        min-width: 35px;
        min-height: 35px;
    }
    
    .toc-level-label {
        font-size: 15px !important;
    }
    
    /* 導航元素優化 */
    .nav-footer a {
        font-size: 16px !important;
        padding: 10px 14px !important;
    }
    
    .nav-home a {
        font-size: 1.0em !important;
    }
    
    .lang-switch a {
        font-size: 1.0em !important;
    }
    
    .top-nav-buttons a {
        font-size: 16px !important;
    }
}

/* ========== 目录层级控制样式 ========== */

/* TOC标题容器 - 水平布局 */
.toc-header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding: 0;
    gap: 20px;
    flex-wrap: nowrap; /* 强制不换行，保持水平布局 */
    min-height: 40px; /* 确保有足够高度 */
}

.toc-header-container h2 {
    margin: 0;
    flex: 1;
}

/* 目录层级控制容器 */
.toc-level-controls {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 0; /* 移除底部margin，由container控制 */
    padding: 0; /* 移除padding，由container控制 */
    flex-shrink: 1; /* 允许适度收缩，但不完全消失 */
    min-width: 180px; /* 设置最小宽度，确保按钮可见 */
}

.toc-level-label {
    font-size: 14px;
    color: #d63384;
    font-weight: 500;
    white-space: nowrap;
}

.toc-level-buttons-vertical {
    display: flex;
    gap: 6px;
}

.toc-level-btn {
    width: 32px;
    height: 32px;
    border: 2px solid #ff69b4;
    background: linear-gradient(135deg, #ffffff 0%, #ffeef0 100%);
    color: #d63384;
    border-radius: 50%;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toc-level-btn:hover {
    background: linear-gradient(135deg, #ffeef0 0%, #ffe4e6 100%);
    transform: scale(1.1);
    box-shadow: 0 3px 12px rgba(255, 105, 180, 0.3);
}

.toc-level-btn.active {
    background: linear-gradient(135deg, #ff69b4 0%, #d63384 100%);
    color: white;
    box-shadow: 0 3px 12px rgba(255, 105, 180, 0.5);
}

.toc-level-btn.active:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(255, 105, 180, 0.6);
}

/* 滚动时显示的浮动层级控制 */
.floating-level-controls {
  position: fixed;
  right: 20px; /* 与阅读设置工具栏保持一致 */
  bottom: 120px; /* 设置在.action-menu上方不远处（30px + 50px + 40px间距） */
  z-index: 950; /* 设置比阅读设置工具栏(900)高一级，但低于action-menu-items(1000) */
  background: rgba(255, 255, 255, 0.92); /* 稍微降低不透明度 */
  border-radius: 25px;
  padding: 12px 8px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12); /* 稍微减轻阴影 */
  backdrop-filter: blur(12px); /* 增强模糊效果 */
  border: 1px solid rgba(255, 105, 180, 0.3);
  transition: all 0.3s ease; /* 简化过渡效果 */
  max-width: 120px; /* 限制最大宽度 */
}

/* 浮動層級控制收縮狀態 */
.floating-level-controls.collapsed {
    padding: 8px;
    max-width: 50px;
    background: rgba(255, 255, 255, 0.95);
}

.floating-level-controls.collapsed .floating-level-content {
    display: none;
}

/* 浮動層級控制展開/收縮按鈕 */
.floating-level-toggle {
  position: absolute;
  top: -12px; /* 向上移動到容器外部，避免遮擋"层级"文字 */
  right: 8px;
  width: 24px;
  height: 24px;
  border: 1px solid #ff69b4;
  background: linear-gradient(135deg, #ffffff 0%, #ffeef0 100%);
  color: #d63384;
  border-radius: 50%;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1001;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15); /* 添加阴影增强可见性 */
}

.floating-level-toggle:hover {
    background: linear-gradient(135deg, #ffeef0 0%, #ffe4e6 100%);
    transform: scale(1.1);
    box-shadow: 0 2px 8px rgba(255, 105, 180, 0.3);
}

/* 收縮狀態時的切換按鈕位置調整 */
.floating-level-controls.collapsed .floating-level-toggle {
  position: relative;
  top: auto;
  right: auto;
  margin: 0 auto;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2); /* 保持阴影效果 */
}

.floating-level-label {
    font-size: 11px;
    color: #d63384;
    font-weight: 500;
    text-align: center;
    margin-bottom: 8px;
    white-space: nowrap;
}

.floating-level-buttons {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.floating-level-btn {
    width: 28px;
    height: 28px;
    border: 2px solid #ff69b4;
    background: linear-gradient(135deg, #ffffff 0%, #ffeef0 100%);
    color: #d63384;
    border-radius: 50%;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.floating-level-btn:hover {
    background: linear-gradient(135deg, #ffeef0 0%, #ffe4e6 100%);
    transform: scale(1.1);
    box-shadow: 0 3px 12px rgba(255, 105, 180, 0.4);
}

.floating-level-btn.active {
    background: linear-gradient(135deg, #ff69b4 0%, #d63384 100%);
    color: white;
    box-shadow: 0 3px 12px rgba(255, 105, 180, 0.6);
}

.floating-level-btn.active:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(255, 105, 180, 0.7);
}

/* 隐藏list默认bullet点 */
/* 首页目录 - 保持原始padding确保展开图标正常显示 */
#main-toc ul {
    list-style: none;
    padding-left: 30px;
    margin: 0;
}

/* 章节页目录 - 减少padding让内容更靠左 */
#chapter-toc ul {
    list-style: none;
    padding-left: 15px;
    margin: 0;
}

.toc li {
    list-style: none;
    margin: 4px 0;
}

/* 目录展开/折叠图标 */
.toc-expand-icon {
    display: inline-block;
    width: 16px;
    text-align: center;
    cursor: pointer;
    user-select: none;
    margin-right: 6px;
    margin-left: -22px; /* 精确调整负边距 */
    transition: transform 0.3s ease;
    color: #ff69b4;
    font-size: 12px;
    position: relative;
}

.toc-expand-icon:hover {
    color: #d63384;
    transform: scale(1.2);
}

.toc-expand-icon.collapsed {
    transform: rotate(-90deg);
}

.toc-expand-icon.collapsed:hover {
    transform: rotate(-90deg) scale(1.2);
}

/* 首页目录展开图标位置 - 保持原始位置确保正常显示 */
#main-toc .toc-item.toc-level-2 .toc-expand-icon {
  left: 42px; /* 第2層，配合首页的 margin-left: 40px */
}

#main-toc .toc-item.toc-level-3 .toc-expand-icon {
  left: 62px; /* 第3層，配合首页的 margin-left: 60px */
}

#main-toc .toc-item.toc-level-4 .toc-expand-icon {
  left: 82px; /* 第4層，配合首页的 margin-left: 80px */
}

/* 章节页目录展开图标位置 - 调整以配合更靠左的布局 */
#chapter-toc .toc-item.toc-level-2 .toc-expand-icon {
  left: 12px; /* 第2層，配合章节页的 margin-left: 10px */
}

#chapter-toc .toc-item.toc-level-3 .toc-expand-icon {
  left: 32px; /* 第3層，配合章节页的 margin-left: 30px */
}

#chapter-toc .toc-item.toc-level-4 .toc-expand-icon {
  left: 52px; /* 第4層，配合章节页的 margin-left: 50px */
}

/* 目录项样式 */
.toc-item {
    position: relative;
    /* 只對背景色和邊框進行動畫，避免展開/收縮時的閃爍 */
    transition: background-color 0.2s ease, border-radius 0.2s ease;
}

/* 为有展开图标的目录项添加可点击样式和稳定的内边距 */
.toc-item.toc-expandable {
    cursor: pointer;
    padding: 2px 4px;
    margin: 0 -4px;
}

/* 鼠标悬停效果 - 为有展开图标的目录项添加反白效果 */
.toc-item.toc-expandable:hover {
    background-color: rgba(255, 105, 180, 0.08);
    border-radius: 4px;
    transition: background-color 0.2s ease;
}

/* 确保链接在悬停时仍然显示为可点击 */
.toc-item.toc-expandable:hover a {
    position: relative;
    z-index: 1;
}

/* 暗色模式下的悬停效果 */
body.dark-mode .toc-item.toc-expandable:hover {
    background-color: rgba(255, 105, 180, 0.15);
}

/* 为没有展开图标的目录项（叶子节点）添加可点击样式 */
.toc-item:not(.toc-expandable) {
    display: flex;
    cursor: pointer;
    padding: 2px 4px;
    margin: 0 -4px;
    border-radius: 4px;
    transition: all 0.2s ease;
}

/* 鼠标悬停效果 - 为没有展开图标的目录项添加反白效果 */
.toc-item:not(.toc-expandable):hover {
    background-color: rgba(255, 105, 180, 0.06);
    border-radius: 4px;
    transition: background-color 0.2s ease;
}

/* 确保链接在悬停时仍然显示为可点击 */
.toc-item:not(.toc-expandable):hover a {
    position: relative;
    z-index: 1;
    text-decoration: none;
}

/* 暗色模式下没有展开图标目录项的悬停效果 */
body.dark-mode .toc-item:not(.toc-expandable):hover {
    background-color: rgba(255, 105, 180, 0.12);
}

.toc-item.hidden {
    display: none !important;
}

.toc-item a {
    display: inline-block;
    transition: all 0.2s ease;
}

/* 目录层级样式 */
.toc-level-1 > .toc-item {
    margin-bottom: 8px;
}

/* 首页目录层级样式 - 保持原始间距确保展开图标正常显示 */
#main-toc .toc-item.toc-level-1 > a {
  font-weight: 600;
  color: #d63384;
  font-size: 16px;
  margin-left: 20px; /* 为展开图标预留空间 */
}

#main-toc .toc-item.toc-level-2 > a {
  font-weight: 500;
  color: #e85aad;
  font-size: 15px;
  margin-left: 40px; /* 保持原始间距 */
}

#main-toc .toc-item.toc-level-3 > a {
  font-weight: 400;
  color: #f06bbf;
  font-size: 14px;
  margin-left: 60px; /* 保持原始间距 */
}

#main-toc .toc-item.toc-level-4 > a {
  font-weight: 400;
  color: #f585cc;
  font-size: 13px;
  margin-left: 80px; /* 保持原始间距 */
}

/* 目录计数样式 */
.toc-count {
  color: #555555; /* 灰色 */
  font-weight: 300; /* 更细的字体 */
  font-size: 0.85em; /* 稍小的字体 */
  margin-left: 6px; /* 与标题保持一定距离 */
  pointer-events: none; /* 不可点击 */
  user-select: none; /* 不可选择 */
  opacity: 0.7; /* 半透明效果 */
}

/* 暗色模式下的计数样式 */
body.dark-mode .toc-count {
  color: #999999; /* 暗色模式下亮一些 */
  opacity: 0.8; /* 暗色模式下稍微明显一些 */
}

/* 章节标题问答数量样式 */
.chapter-qa-count {
  color: #555555; /* 与目录计数相同的灰色 */
  font-weight: 300; /* 更细的字体 */
  font-size: 0.85em; /* 稍小的字体 */
  margin-left: 6px; /* 与标题保持一定距离 */
  pointer-events: none; /* 不可点击 */
  user-select: none; /* 不可选择 */
  opacity: 0.7; /* 半透明效果 */
}

/* 暗色模式下的章节标题问答数量样式 */
body.dark-mode .chapter-qa-count {
  color: #999999; /* 暗色模式下亮一些 */
  opacity: 0.8; /* 暗色模式下稍微明显一些 */
}

/* 章节页目录层级样式 - 减少间距让内容更靠左 */
#chapter-toc .toc-item.toc-level-1 > a {
  font-weight: 600;
  color: #d63384;
  font-size: 16px;
  margin-left: 20px; /* 为展开图标预留空间 */
}

#chapter-toc .toc-item.toc-level-2 > a {
  font-weight: 500;
  color: #e85aad;
  font-size: 15px;
  margin-left: 10px; /* 章节页更靠左 */
}

#chapter-toc .toc-item.toc-level-3 > a {
  font-weight: 400;
  color: #f06bbf;
  font-size: 14px;
  margin-left: 30px; /* 章节页更靠左 */
}

#chapter-toc .toc-item.toc-level-4 > a {
  font-weight: 400;
  color: #f585cc;
  font-size: 13px;
  margin-left: 50px; /* 章节页更靠左 */
}

/* 章节项特殊样式 */
.toc-item.toc-chapter {
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid #ffc4dd;
}

.toc-item.toc-chapter > a:hover {
    color: #c1327a;
}

/* 折叠动画 */
.toc-collapsible {
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.toc-collapsible.collapsed {
    max-height: 0;
}

.toc-collapsible.expanded {
    max-height: 1000px; /* 足够大的值 */
}

/* 暗色模式适配 */
body.dark-mode .toc-header-container h2 {
    color: #ff91af; /* 暗色模式下的标题颜色 */
}

body.dark-mode .toc-level-label {
    color: #ff91af;
}

body.dark-mode .toc-level-btn {
    border-color: #ff69b4;
    background: linear-gradient(135deg, #2d2d2d 0%, #3a3a3a 100%);
    color: #ff91af;
}

body.dark-mode .toc-level-btn:hover {
    background: linear-gradient(135deg, #3a3a3a 0%, #4a4a4a 100%);
}

body.dark-mode .toc-level-btn.active {
    background: linear-gradient(135deg, #ff69b4 0%, #d63384 100%);
    color: white;
}

/* 浮动控制暗色模式 */
body.dark-mode .floating-level-controls {
    background: rgba(40, 40, 40, 0.95);
    border-color: rgba(255, 105, 180, 0.3);
}

body.dark-mode .floating-level-label {
    color: #ff91af;
}

body.dark-mode .floating-level-btn {
    border-color: #ff69b4;
    background: linear-gradient(135deg, #2d2d2d 0%, #3a3a3a 100%);
    color: #ff91af;
}

body.dark-mode .floating-level-btn:hover {
    background: linear-gradient(135deg, #3a3a3a 0%, #4a4a4a 100%);
}

body.dark-mode .floating-level-btn.active {
    background: linear-gradient(135deg, #ff69b4 0%, #d63384 100%);
    color: white;
}

/* 浮動層級切換按鈕暗色模式 */
body.dark-mode .floating-level-toggle {
    border-color: #ff69b4;
    background: linear-gradient(135deg, #2d2d2d 0%, #3a3a3a 100%);
    color: #ff91af;
}

body.dark-mode .floating-level-toggle:hover {
  background: linear-gradient(135deg, #3a3a3a 0%, #4a4a4a 100%);
  box-shadow: 0 2px 8px rgba(255, 105, 180, 0.4);
}

body.dark-mode .floating-level-toggle {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3); /* 暗色模式下的阴影 */
}

body.dark-mode .toc-expand-icon {
    color: #ff91af;
}

body.dark-mode .toc-expand-icon:hover {
    color: #ff69b4;
}

body.dark-mode .toc-item.toc-level-1 > a {
    color: #ff91af;
}

body.dark-mode .toc-item.toc-level-2 > a {
    color: #ffb3c6;
}

body.dark-mode .toc-item.toc-level-3 > a {
    color: #ffc4d6;
}

body.dark-mode .toc-item.toc-level-4 > a {
    color: #ffd1e0;
}

body.dark-mode .toc-item.toc-chapter {
    border-bottom-color: #444;
}

/* 章節頁面目錄夜間模式適配 - 提高優先級 */
body.dark-mode .toc > ul > li > a {
    color: #ff91af !important; /* 與側邊欄第1層相同 */
}

body.dark-mode .toc ul ul > li > a {
    color: #ffb3c6 !important; /* 與側邊欄第2層相同 */
}

body.dark-mode .toc ul ul ul > li > a {
    color: #ffc4d6 !important; /* 與側邊欄第3層相同 */
}

body.dark-mode .toc ul ul ul ul > li > a {
    color: #ffd1e0 !important; /* 第4層顏色 */
}

/* 暗色模式下浮动TOC适配 */
body.dark-mode .floating-toc {
    background: rgba(40, 40, 40, 0.95);
    border-color: rgba(255, 105, 180, 0.3);
}

body.dark-mode .floating-toc-header {
    background: rgba(40, 40, 40, 0.95);
    border-bottom-color: #444;
    color: #ff91af;
}

body.dark-mode .floating-toc-content {
    background: transparent;
}

body.dark-mode .floating-toc-item {
    color: #ff91af; /* 統一使用主頁面目錄的第1層顏色 */
}

body.dark-mode .floating-toc-item.level-h3 {
    color: #ffb3c6; /* 統一使用主頁面目錄的第2層顏色 */
}

body.dark-mode .floating-toc-item.level-h4 {
    color: #ffd1e0; /* 統一使用主頁面目錄的第4層顏色 */
}

body.dark-mode .floating-toc-item.level-h5 {
    color: #ffd1e0; /* 統一使用主頁面目錄的第4層顏色 */
}

body.dark-mode .floating-toc-item:hover {
    background: rgba(255, 105, 180, 0.2);
}

body.dark-mode .floating-toc-item.active {
    background: rgba(255, 105, 180, 0.3);
    color: #ff69b4;
}

body.dark-mode .bookmark-item {
    background: rgba(60, 60, 60, 0.5);
    border-color: #555;
    color: #ff91af; /* 與首頁書籤粉色一致 */
}

body.dark-mode .bookmark-item:hover {
    background: rgba(255, 105, 180, 0.15);
    border-color: #ff69b4;
}

/* 夜間模式下書籤文字內容修正 */
body.dark-mode .bookmark-preview {
    color: #ff91af; /* 與首頁書籤粉色一致 */
}

body.dark-mode .bookmark-meta {
    color: #ccc; /* 稍微淺一點的灰色，確保元資訊可讀性 */
}

body.dark-mode .bookmark-questioner {
    color: #ff69b4; /* 與章節標題顏色一致 */
}

body.dark-mode .bookmark-time {
    color: #a99; /* 更柔和的粉紅灰色 */
    opacity: 0.7; /* 夜間模式下更低調 */
}

/* 响应式浮动层级控制定位 */

/* 宽屏幕优化：将浮动层级控制按钮靠近内容区域并垂直置中 */
@media (min-width: 800px) {
  .floating-level-controls {
    /* 在宽屏幕下，将按钮定位到内容区域右侧，避免用户鼠标移动距离过远 */
    right: auto;
    left: calc(75%); /* 屏幕中心偏右 */
    /* 实现垂直置中 */
    bottom: auto; /* 移除bottom定位 */
    top: 50%; /* 垂直置中起点 */
    transform: translateY(-50%); /* 完成垂直置中 */
  }
}

/* 移动端优化觸摸體驗 */
@media (max-width: 600px) {
  .floating-level-controls {
    /* 在移动端调整到右下角，避免与其他UI元素冲突 */
    right: 15px;
    top: auto;
    bottom: 130px; /* 放置在操作按钮上方，与桌面端保持相对位置一致 */
    padding: 15px 10px; /* 增加padding讓觸摸更容易 */
    max-width: 100px; 
    z-index: 950 !important; /* 保持与桌面版一致的层级关系 */
    background: rgba(255, 255, 255, 0.95); /* 提高背景不透明度 */
    border: 2px solid rgba(255, 105, 180, 0.6); /* 增强边框 */
    box-shadow: 0 6px 25px rgba(0, 0, 0, 0.2); /* 增强陰影 */
  }
    
    .floating-level-label {
        font-size: 12px; /* 增大字體便於閱讀 */
        margin-bottom: 8px;
        font-weight: bold;
    }
    
    .floating-level-btn {
        width: 32px; /* 增大按鈕尺寸便於觸摸 */
        height: 32px;
        font-size: 13px;
        margin: 3px 0; /* 增加間距 */
    }
    
    /* 手機端浮動層級切換按鈕優化 */
    .floating-level-toggle {
        width: 28px !important;
        height: 28px !important;
        font-size: 14px !important;
        border-width: 2px !important;
    }
    
    /* 手機端基礎字型大小調整 */
    /* 移除!important，让JavaScript动态字体调整生效 */
    body {
        line-height: 1.8;
    }
    
    /* 手機端字體控制按鈕優化 */
    .toolbar-controls {
        gap: 12px; /* 手機端增加最多間距以防誤觸 */
    }
    
    .ctrl-btn.font-option {
        padding: 10px 20px; /* 手機端增加最多padding便於觸摸 */
        min-width: 60px;
        font-size: 13px; /* 稍微增大字體便於閱讀 */
    }
    
    /* 手機端TOC目錄字型優化 - 移除 !important 讓JavaScript動態調整生效 */
    .toc > ul > li { 
        margin-bottom: 12px;
        /* 字體大小和行距由JavaScript動態設置 */
    }
    
    .toc ul ul > li { 
        margin-bottom: 10px;
        /* 字體大小和行距由JavaScript動態設置 */
    }
    
    .toc ul ul ul > li { 
        margin-bottom: 8px;
        /* 字體大小和行距由JavaScript動態設置 */
    }
    
    .toc ul ul ul ul > li { 
        margin-bottom: 6px;
        /* 字體大小和行距由JavaScript動態設置 */
    }
    
    /* 手機端章節頁TOC優化 - 移除 !important 讓JavaScript動態調整生效 */
    /* 字體大小和行距由JavaScript動態設置，保留以下空選擇器作為CSS結構標記 */
    
    /* 手機端標題字型調整 */
    h1 { font-size: 28px !important; line-height: 1.3; }
    h2 { font-size: 24px !important; line-height: 1.4; }
    h3 { font-size: 22px !important; line-height: 1.4; }
    h4 { font-size: 20px !important; line-height: 1.4; }
    
    /* 手機端按鈕優化 */
    .toc-level-btn, .floating-level-btn {
        font-size: 16px !important;
        min-width: 38px;
        min-height: 38px;
    }
    
    .toc-level-label {
        font-size: 16px !important;
    }
}

/* 小手機螢幕進一步優化 */
@media (max-width: 400px) {
  .floating-level-controls {
    right: 10px; /* 进一步靠近边缘 */
    bottom: 125px; /* 与桌面端和移动端保持相对位置一致 */
    padding: 18px 12px; /* 更大的觸摸區域 */
    max-width: 110px;
    z-index: 950 !important; /* 保持与其他设备一致的层级关系 */
    background: rgba(255, 255, 255, 0.98) !important;
    border: 3px solid rgba(255, 105, 180, 0.8) !important; /* 更明顯的邊框 */
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3) !important;
  }
    
    .floating-level-label {
        font-size: 13px !important; /* 更大的標籤字體 */
        margin-bottom: 10px !important;
        font-weight: bold !important;
        color: #d63384 !important;
    }
    
    .floating-level-btn {
        width: 36px !important; /* 更大的按鈕 */
        height: 36px !important;
        font-size: 14px !important;
        margin: 4px 0 !important;
        border-width: 3px !important; /* 更粗的邊框 */
    }
    
    /* 小手機端浮動層級切換按鈕進一步優化 */
    .floating-level-toggle {
        width: 32px !important;
        height: 32px !important;
        font-size: 16px !important;
        border-width: 3px !important;
    }
    
    /* 小手機端進一步文字優化 */
    /* 移除!important，让JavaScript动态字体调整生效 */
    body {
        line-height: 1.9;
    }
    
    /* 小手機端TOC目錄字型最大化優化 - 移除 !important 讓JavaScript動態調整生效 */
    .toc > ul > li { 
        /* 字體大小和行距由JavaScript動態設置 */
        margin-bottom: 14px;
    }
    
    .toc ul ul > li { 
        /* 字體大小和行距由JavaScript動態設置 */
        margin-bottom: 12px;
    }
    
    .toc ul ul ul > li { 
        /* 字體大小和行距由JavaScript動態設置 */
        margin-bottom: 10px;
    }
    
    .toc ul ul ul ul > li { 
        /* 字體大小和行距由JavaScript動態設置 */
        margin-bottom: 8px;
    }
    
    /* 小手機端章節頁TOC最大化優化 - 移除 !important 讓JavaScript動態調整生效 */
    /* 字體大小和行距由JavaScript動態設置，保留以下空選擇器作為CSS結構標記 */
    
    /* 小手機端標題字型最大化調整 */
    h1 { font-size: 30px !important; line-height: 1.3; }
    h2 { font-size: 26px !important; line-height: 1.4; }
    h3 { font-size: 24px !important; line-height: 1.4; }
    h4 { font-size: 22px !important; line-height: 1.4; }
    
    /* 小手機端按鈕進一步優化 */
    .toc-level-btn, .floating-level-btn {
        font-size: 17px !important;
        min-width: 40px !important;
        min-height: 40px !important;
    }
    
    .toc-level-label {
        font-size: 17px !important;
    }
    
    /* 小手機端導航和其他元素 */
    .nav-footer a {
        font-size: 17px !important;
        padding: 12px 16px !important;
    }
    
    .nav-home a, .lang-switch a {
        font-size: 1.1em !important;
    }
    
    .top-nav-buttons a {
        font-size: 17px !important;
    }
}

/* ========== 屏幕高度优化 ========== */

/* 当屏幕高度充足时，让閱讀設置工具栏底部靠近右下角操作菜单 */
@media (min-height: 700px) {
  .reading-toolbar {
    top: auto; /* 移除top定位 */
    bottom: 110px; /* 操作菜单(bottom: 30px + 50px按钮高度 + 30px安全间距) */
    max-height: calc(100vh - 130px); /* 调整最大高度：视窗高度 - 底部偏移 - 顶部安全距离 */
    /* 保持原有的滚动条和其他样式 */
  }
}

/* 当屏幕高度不足时，优化閱讀設置工具栏位置 */
@media (max-height: 600px) {
  .reading-toolbar {
    top: 10px; /* 贴近顶部，最大化可视空间 */
    max-height: calc(100vh - 20px); /* 几乎占满整个视窗高度 */
  }
}

/* 极小高度屏幕进一步优化 */
@media (max-height: 400px) {
  .reading-toolbar {
    top: 5px; /* 更接近顶部 */
    max-height: calc(100vh - 10px);
    padding: 10px; /* 减少内边距以节省空间 */
  }
  
  .toolbar-section {
    margin-bottom: 10px; /* 减少间距 */
    padding-bottom: 8px;
  }
  
  .toolbar-label {
    margin-bottom: 3px; /* 压缩标签间距 */
  }
}

/* 原始文件名顯示（供編輯人員和管理人員參考） */
p.source-filename {
  color: #ccc;
  font-size: 12px;
  font-family: 'Courier New', monospace;
  font-weight: normal;
  margin: 5px 0 15px 0;
  opacity: 0.7;
  user-select: text; /* 確保可以選取 */
  cursor: text;
  padding-left: 25px;
  line-height: 1.2;
}

/* 當滑鼠懸停時稍微增加可見性 */
p.source-filename:hover {
  opacity: 0.9;
}

/* 響應式設計：在小螢幕上調整 */
@media (max-width: 768px) {
  p.source-filename {
    font-size: 10px;
    margin: 3px 0 10px 0;
  }
}