/* ============================================================
   Design tokens — single source of truth for all colors.
   Change a value here and it propagates everywhere.
   ============================================================ */
:root {
    /* Pink palette */
    --color-primary:      #e75480;
    --color-primary-light:#ff69b4;
    --color-primary-deep: #c73650;
    --color-h3:           #e85aad;
    --color-h4:           #f585cc;
    --color-accent-pale:  #f8c8dc;
    --color-bg-page:      #fff0f5;

    /* Functional aliases */
    --color-link:         var(--color-primary);
    --color-link-hover:   var(--color-primary-light);

    /* Gradients */
    --gradient-primary:   linear-gradient(135deg, #e75480 0%, #ff69b4 100%);
    --gradient-hr:        linear-gradient(to right, #f8c8dc, #e75480, #f8c8dc);

    /* Shadows */
    --shadow-sm:          0 2px 6px rgba(231, 84, 128, 0.2);
    --shadow-md:          0 3px 8px rgba(231, 84, 128, 0.3);
    --shadow-lg:          0 4px 12px rgba(231, 84, 128, 0.4);

    /* Radii */
    --radius-sm:          6px;
    --radius-md:          8px;
    --radius-lg:          12px;

    /* Typography */
    --line-height:        1.6;
}

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

h1 { color: var(--color-primary); border-bottom: 2px solid var(--color-accent-pale); padding-bottom: 10px; padding-left: 10px;}
h2 { color: var(--color-primary); margin-top: 40px; padding-left: 5px; } /* 與目錄第1層相同 */
h3 { color: var(--color-h3); margin-top: 25px; padding-left: 5px; } /* 與目錄第2層相同 */
h4 { color: var(--color-h4); 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: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; color: var(--color-primary-light); }
hr { border: none; height: 2px; background: var(--gradient-hr); 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: var(--color-primary);
    text-decoration: none;
}

.nav-home a:hover {
    color: var(--color-primary-light);
    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: var(--gradient-primary); 
    color: white; 
    border-radius: 6px; 
    text-decoration: none; 
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s ease; 
    box-shadow: var(--shadow-sm);
    max-width: 45%;
    text-align: center;
    word-wrap: break-word;
    line-height: 1.4;
}
.nav-footer a:hover { 
    transform: translateY(-1px); 
    box-shadow: var(--shadow-md); 
    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: var(--gradient-primary);
    color: white;
    border-radius: 6px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
    max-width: 45%;
    text-align: center;
    word-wrap: break-word;
}

.top-nav-buttons a:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    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: var(--color-primary); /* 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: var(--color-h3); /* 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 var(--color-primary);
    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: var(--color-primary);
    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 var(--color-primary-light);
    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: var(--color-primary-light);
    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: var(--color-primary-light); }
body.dark-mode .answer-text { color: #fddde6; }
body.dark-mode .answerer { color: var(--color-primary-light); }

/* 暗色模式下的导航按钮 */
body.dark-mode .nav-footer a { 
    background: linear-gradient(135deg, #5a2d49 0%, var(--color-primary-light) 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%, var(--color-primary-light) 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: var(--color-primary-light); 
    /* 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: var(--color-primary-light); }
body.dark-mode .nav-home a { color: #ff91af; }
body.dark-mode .nav-home a:hover { color: var(--color-primary-light); }

/* 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: var(--color-primary-light); 
    /* 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; }

/* ============================================================
   01a-layout.css — 閱讀工具欄、閱讀進度條、操作按鈕、Toast
   ============================================================ */

/* ---- 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: var(--radius-lg);
    padding: 15px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    z-index: 980;
    transition: transform 0.3s ease, opacity 0.3s ease;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
}

.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: var(--color-primary);
}

.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; align-items: center; }

/* ---- 通用控制按鈕 --------------------------------------- */
.ctrl-btn {
    padding: 6px 10px;
    border: 1px solid #ddd;
    background: #fff;
    border-radius: var(--radius-sm);
    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: var(--color-primary); color: white; border-color: var(--color-primary); }

.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;
    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%); }
.ctrl-btn.font-adjust.clicked { background: linear-gradient(135deg, var(--color-primary) 0%, #c73650 100%); color: white; border-color: var(--color-primary); transform: scale(0.95); }
.ctrl-btn.font-option { padding: 6px 16px; min-width: 50px; position: relative; white-space: nowrap; }

/* ---- 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, var(--color-primary), var(--color-primary-light)); width: 0%; transition: width 0.1s ease; }

/* ---- 操作按鈕組（懸浮菜單） ----------------------------- */
.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: var(--color-primary-light);
    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: var(--color-primary-light); z-index: 1001; }
.action-btn.menu-btn.expanded { transform: rotate(90deg); background: var(--color-primary); }

.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;
}
.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: var(--color-primary-light); transform: scale(0.8); }
.action-menu.expanded .action-menu-items .action-btn { transform: scale(1); }
.action-menu-items .action-btn:hover { background: var(--color-primary); transform: scale(1.05); }

/* ---- 問答互動按鈕 --------------------------------------- */
.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: var(--color-primary); color: white; transform: scale(1.1); }

/* ---- Toast 通知 ----------------------------------------- */
.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 { background: rgba(59, 28, 50, 0.95); border-color: #5a2d49; }
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); }

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: var(--color-primary-light); }
body.dark-mode .ctrl-btn.active { background: var(--color-primary-light); color: #fff; border-color: var(--color-primary-light); box-shadow: 0 0 8px rgba(255, 105, 180, 0.5); }
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, var(--color-primary-light) 0%, var(--color-primary-deep) 100%); color: white; border-color: var(--color-primary-light); }

body.dark-mode .action-btn { background: var(--color-primary-light); box-shadow: 0 4px 15px rgba(255, 105, 180, 0.4); }
body.dark-mode .action-btn:hover { background: var(--color-primary); box-shadow: 0 6px 20px rgba(255, 105, 180, 0.5); }
body.dark-mode .action-btn.menu-btn.expanded { background: var(--color-primary); }
body.dark-mode .action-menu-items .action-btn { background: var(--color-primary-light); }
body.dark-mode .action-menu-items .action-btn:hover { background: var(--color-primary); }
/* ============================================================
   01b-floating-toc.css — 浮動目錄面板（panel、tabs、items）
   ============================================================ */

.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: var(--radius-lg);
    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: var(--color-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    flex-shrink: 0;
}

.floating-toc-content {
    flex: 1;
    overflow-y: auto;
    padding: 0;
    line-height: 1.4 !important;
    overflow-x: hidden;
}
.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); }

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

.floating-toc-item {
    padding: 8px 12px;
    margin: 2px 0;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 13px;
    border-left: 3px solid transparent;
    line-height: 1.3 !important;
    word-wrap: break-word;
    white-space: normal;
    overflow-wrap: break-word;
    color: var(--color-primary);
}
.floating-toc-item.level-h3 { padding-left: 24px; font-size: 12px; color: var(--color-h3); line-height: 1.3 !important; word-wrap: break-word; white-space: normal; overflow-wrap: break-word; }
.floating-toc-item.level-h4 { padding-left: 36px; font-size: 11px; color: var(--color-h4); line-height: 1.3 !important; word-wrap: break-word; white-space: normal; overflow-wrap: break-word; }
.floating-toc-item.level-h5 { padding-left: 48px; font-size: 10px; color: var(--color-h4); line-height: 1.3 !important; 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: var(--color-primary); font-weight: 600; color: var(--color-primary); border-radius: 4px; transform: translateX(2px); box-shadow: 0 1px 4px rgba(231, 84, 128, 0.3); }

/* ---- Tabs ------------------------------------------------ */
.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: var(--color-primary); border-bottom-color: var(--color-primary); font-weight: 600; }
.floating-toc-tab:hover { background: rgba(231, 84, 128, 0.05); }

/* ---- 暗色模式 ------------------------------------------- */
body.dark-mode .floating-toc { background: rgba(59, 28, 50, 0.95); border-color: #5a2d49; }
body.dark-mode .floating-toc-header { background: rgba(59, 28, 50, 0.95); border-bottom: 1px solid #5a2d49; }
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-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: var(--color-primary-light); color: var(--color-primary-light); box-shadow: 0 1px 4px rgba(255, 105, 180, 0.4); }
body.dark-mode .floating-toc-tab { color: #fddde6; border-bottom: 1px solid #5a2d49; }
body.dark-mode .floating-toc-tab.active { color: var(--color-primary-light); border-bottom-color: var(--color-primary-light); }
body.dark-mode .floating-toc-tab:hover { background: rgba(255, 105, 180, 0.1); }
/* ============================================================
   01c-bookmarks.css — 書籤面板、書籤標識、書籤分組、章節信息
   ============================================================ */

/* ---- 書籤列表項 ------------------------------------------ */
.bookmark-item {
    padding: 10px 12px;
    margin: 4px 0;
    border-radius: var(--radius-sm);
    border: 1px solid #f0f0f0;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    word-wrap: break-word;
    white-space: normal;
    overflow-wrap: break-word;
    line-height: 1.4;
}
.bookmark-item:hover { background: rgba(231, 84, 128, 0.05); border-color: var(--color-primary); }

.qa-pair-bookmark {
    border-left: 3px solid var(--color-primary-light);
    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;
}
/* second usage of .bookmark-meta (homepage variant with justify-content) */
.bookmark-chapter-list .bookmark-meta {
    justify-content: space-between;
    margin: 4px 0;
}

.bookmark-type { font-size: 12px; flex-shrink: 0; }
.bookmark-questioner { font-weight: 600; color: var(--color-primary); flex: 1; }
.bookmark-time { font-size: 10px; flex-shrink: 0; color: #b18a9e; opacity: 0.8; }

/* ---- 首頁書籤分組 ---------------------------------------- */
.bookmark-chapter-group {
    margin-bottom: 15px;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
    line-height: 1.4 !important;
    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 var(--color-accent-pale);
    line-height: 1.4 !important;
    cursor: default !important;
    word-wrap: break-word;
    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;
    list-style: none;
    position: relative;
}
.bookmark-chapter-list .bookmark-item:hover { background: #f0f0f0; }

.bookmark-remove {
    background: none;
    border: none;
    color: var(--color-primary);
    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: var(--color-primary); }

.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; }

/* ---- 書籤視覺標識 (bookmarked 元素) -------------------- */
.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 var(--color-primary-light);
    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); }

/* ---- 書籤分組（面板內折疊組） -------------------------- */
.bookmark-chapter {
    margin: 12px 0 8px 0;
    padding: 8px 12px;
    background: rgba(231, 84, 128, 0.1);
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--color-primary);
}
/* .bookmark-chapter-title already defined above; extend for panel usage */
.bookmark-chapter > .bookmark-chapter-title {
    font-size: 14px;
    color: var(--color-primary);
    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: var(--color-primary);
}

/* ---- 當前章節信息條 ------------------------------------- */
.current-chapter-info {
    padding: 8px 12px;
    margin-bottom: 12px;
    background: rgba(231, 84, 128, 0.1);
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--color-primary);
}
.chapter-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0; }
.current-chapter-title { font-size: 14px; font-weight: 600; color: var(--color-primary); 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); }

/* ---- 暗色模式 ------------------------------------------- */
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: var(--color-primary-light);
    box-shadow: 0 2px 8px rgba(255, 105, 180, 0.3);
}
body.dark-mode .bookmark-chapter { background: rgba(255, 105, 180, 0.15); border-left-color: var(--color-primary-light); }
body.dark-mode .bookmark-chapter > .bookmark-chapter-title { color: var(--color-primary-light); }
body.dark-mode .bookmark-chapter-count { background: rgba(255, 105, 180, 0.3); color: var(--color-primary-light); }
body.dark-mode .current-chapter-info { background: rgba(255, 105, 180, 0.15); border-left-color: var(--color-primary-light); }
body.dark-mode .current-chapter-title { color: var(--color-primary-light); }
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: var(--color-primary-light);
    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: var(--gradient-primary);
    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, var(--color-primary-light) 0%, var(--color-primary) 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 var(--color-accent-pale);
    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-scope {
    display: none;
    gap: 0;
    margin-top: 10px;
    border: 2px solid var(--color-accent-pale);
    border-radius: var(--radius-sm, 8px);
    overflow: hidden;
    background: #fff;
}

.search-scope.is-visible {
    display: flex;
}

.search-scope-btn {
    flex: 1;
    padding: 8px 12px;
    font-size: 14px;
    border: none;
    background: transparent;
    color: #666;
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease;
}

.search-scope-btn + .search-scope-btn {
    border-left: 1px solid var(--color-accent-pale);
}

.search-scope-btn:hover {
    background: #fff8f5;
    color: var(--color-primary);
}

.search-scope-btn.is-active {
    background: var(--color-primary);
    color: #fff;
    font-weight: 600;
}

.search-scope-btn.is-active:hover {
    background: var(--color-primary);
    color: #fff;
}

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

#search-input:focus {
    border-color: var(--color-primary);
    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 var(--color-primary);
    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-bar.is-indeterminate .search-progress-fill {
    width: 30% !important;
    transition: none;
    animation: search-progress-indeterminate 1.2s ease-in-out infinite;
}

@keyframes search-progress-indeterminate {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(350%); }
}

.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: var(--color-primary);
    color: white;
    border: none;
    padding: 4px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    transition: background 0.2s;
}

.search-retry-btn:hover {
    background: var(--color-primary-deep);
}

.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 var(--color-accent-pale);
    flex-wrap: wrap;
    gap: 10px;
}

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

.search-results-count {
    font-weight: 600;
    color: var(--color-primary);
}

.search-clear, .search-collapse, .search-load-more, .search-load-all {
    background: var(--color-accent-pale);
    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: var(--color-primary);
    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 var(--color-primary);
    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: var(--color-primary-light);
}



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



.search-result-type {
    white-space: nowrap;
    display: inline-block;
    background: var(--color-accent-pale);
    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, var(--color-primary-light) 0%, var(--color-primary) 100%);
    box-shadow: 0 4px 15px rgba(255, 105, 180, 0.4);
}

body.dark-mode .search-activate-btn:hover {
    background: var(--gradient-primary);
    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: var(--color-primary-light);
    box-shadow: 0 0 0 3px rgba(255, 105, 180, 0.2);
}

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

body.dark-mode .search-scope-btn {
    color: #ccc;
}

body.dark-mode .search-scope-btn + .search-scope-btn {
    border-left-color: #4a2c4a;
}

body.dark-mode .search-scope-btn:hover {
    background: #3a2a3a;
    color: var(--color-primary-light);
}

body.dark-mode .search-scope-btn.is-active {
    background: var(--color-primary);
    color: #fff;
}

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: var(--color-primary-light);
}

/* 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: var(--color-primary-light);
    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: var(--color-primary-light);
}

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: var(--color-primary-light);
}

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: var(--color-primary-light);
    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;
}


/* ============================================================
   04a-toc-levels.css — 目錄層級控制、浮動層級面板、TOC 項目樣式
   ============================================================ */

/* ---- 目錄標題容器 --------------------------------------- */
.toc-header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding: 0;
    gap: 20px;
    flex-wrap: nowrap;
    min-height: 40px;
}
.toc-header-container h2 { margin: 0; flex: 1; }

/* ---- 目錄層級控制（固定在頁面頂部）--------------------- */
.toc-level-controls {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 0;
    padding: 0;
    flex-shrink: 1;
    min-width: 180px;
}
.toc-level-label { font-size: 14px; color: var(--color-primary-deep); font-weight: 500; white-space: nowrap; }
.toc-level-buttons-vertical { display: flex; gap: 6px; }

.toc-level-btn {
    width: 32px;
    height: 32px;
    border: 2px solid var(--color-primary-light);
    background: linear-gradient(135deg, #ffffff 0%, #ffeef0 100%);
    color: var(--color-primary-deep);
    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, var(--color-primary-light) 0%, var(--color-primary-deep) 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); }

/* ---- 浮動層級控制（捲動後出現）------------------------- */
.floating-level-controls {
    position: fixed;
    right: 20px;
    bottom: 120px;
    z-index: 950;
    background: rgba(255, 255, 255, 0.92);
    border-radius: 25px;
    padding: 12px 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 105, 180, 0.3);
    transition: all 0.3s ease;
    max-width: 120px;
}
.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; }

.floating-level-toggle {
    position: absolute;
    top: -12px;
    right: 8px;
    width: 24px;
    height: 24px;
    border: 1px solid var(--color-primary-light);
    background: linear-gradient(135deg, #ffffff 0%, #ffeef0 100%);
    color: var(--color-primary-deep);
    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);
}
.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); }
.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); }

.floating-level-label { font-size: 11px; color: var(--color-primary-deep); 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 var(--color-primary-light);
    background: linear-gradient(135deg, #ffffff 0%, #ffeef0 100%);
    color: var(--color-primary-deep);
    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, var(--color-primary-light) 0%, var(--color-primary-deep) 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); }

/* ---- TOC 列表基礎 -------------------------------------- */
#main-toc ul { list-style: none; padding-left: 30px; margin: 0; }
#chapter-toc ul { list-style: none; padding-left: 15px; margin: 0; }
.toc li { list-style: none; margin: 4px 0; }

/* ---- 展開/收縮圖標 ------------------------------------- */
.toc-expand-icon {
    display: inline-block;
    width: 16px;
    text-align: center;
    cursor: pointer;
    user-select: none;
    margin-right: 6px;
    margin-left: -22px;
    transition: transform 0.3s ease;
    color: var(--color-primary-light);
    font-size: 12px;
    position: relative;
}
.toc-expand-icon:hover { color: var(--color-primary-deep); transform: scale(1.2); }
.toc-expand-icon.collapsed { transform: rotate(-90deg); }
.toc-expand-icon.collapsed:hover { transform: rotate(-90deg) scale(1.2); }

/* 首頁目錄展開圖標位置 */
#main-toc .toc-item.toc-level-2 .toc-expand-icon { left: 42px; }
#main-toc .toc-item.toc-level-3 .toc-expand-icon { left: 62px; }
#main-toc .toc-item.toc-level-4 .toc-expand-icon { left: 82px; }

/* 章節頁目錄展開圖標位置 */
#chapter-toc .toc-item.toc-level-2 .toc-expand-icon { left: 12px; }
#chapter-toc .toc-item.toc-level-3 .toc-expand-icon { left: 32px; }
#chapter-toc .toc-item.toc-level-4 .toc-expand-icon { left: 52px; }

/* ---- TOC 項目行為 --------------------------------------- */
.toc-item { position: relative; transition: background-color 0.2s ease, border-radius 0.2s ease; }
.toc-item.toc-expandable { cursor: pointer; padding: 2px 4px; margin: 0 -4px; }
.toc-item.toc-expandable:hover { background-color: rgba(255, 105, 180, 0.08); border-radius: 4px; transition: background-color 0.2s ease; }
.toc-item.toc-expandable:hover a { position: relative; z-index: 1; }
.toc-item:not(.toc-expandable) { display: flex; cursor: pointer; padding: 2px 4px; margin: 0 -4px; border-radius: 4px; transition: all 0.2s ease; }
.toc-item:not(.toc-expandable):hover { background-color: rgba(255, 105, 180, 0.06); border-radius: 4px; transition: background-color 0.2s ease; }
.toc-item:not(.toc-expandable):hover a { position: relative; z-index: 1; text-decoration: none; }
.toc-item.hidden { display: none !important; }
.toc-item a { display: inline-block; transition: all 0.2s ease; }

/* ---- TOC 層級樣式 --------------------------------------- */
.toc-level-1 > .toc-item { margin-bottom: 8px; }

/* 首頁目錄 */
#main-toc .toc-item.toc-level-1 > a { font-weight: 600; color: var(--color-primary-deep); font-size: 16px; margin-left: 20px; }
#main-toc .toc-item.toc-level-2 > a { font-weight: 500; color: var(--color-h3); font-size: 15px; margin-left: 40px; }
#main-toc .toc-item.toc-level-3 > a { font-weight: 400; color: #f06bbf; font-size: 14px; margin-left: 60px; }
#main-toc .toc-item.toc-level-4 > a { font-weight: 400; color: var(--color-h4); font-size: 13px; margin-left: 80px; }

/* 章節頁目錄 */
#chapter-toc .toc-item.toc-level-1 > a { font-weight: 600; color: var(--color-primary-deep); font-size: 16px; margin-left: 20px; }
#chapter-toc .toc-item.toc-level-2 > a { font-weight: 500; color: var(--color-h3); font-size: 15px; margin-left: 10px; }
#chapter-toc .toc-item.toc-level-3 > a { font-weight: 400; color: #f06bbf; font-size: 14px; margin-left: 30px; }
#chapter-toc .toc-item.toc-level-4 > a { font-weight: 400; color: var(--color-h4); font-size: 13px; margin-left: 50px; }

/* ---- 計數標記 ------------------------------------------ */
.toc-count { color: #555; font-weight: 300; font-size: 0.85em; margin-left: 6px; pointer-events: none; user-select: none; opacity: 0.7; }
.chapter-qa-count { color: #555; font-weight: 300; font-size: 0.85em; margin-left: 6px; pointer-events: none; user-select: none; opacity: 0.7; }

/* ---- 特殊章節項 ----------------------------------------- */
.toc-item.toc-chapter { margin-bottom: 12px; padding-bottom: 8px; border-bottom: 1px solid #ffc4dd; }
.toc-item.toc-chapter > a:hover { color: #c1327a; }

/* ---- 折疊動畫 ------------------------------------------- */
.toc-collapsible { overflow: hidden; transition: max-height 0.3s ease-out; }
.toc-collapsible.collapsed { max-height: 0; }
.toc-collapsible.expanded { max-height: 1000px; }
/* ============================================================
   04b-toc-dark.css — 目錄相關元素的暗色模式適配
   ============================================================ */

/* ---- 目錄層級控制 --------------------------------------- */
body.dark-mode .toc-header-container h2 { color: #ff91af; }
body.dark-mode .toc-level-label { color: #ff91af; }
body.dark-mode .toc-level-btn { border-color: var(--color-primary-light); 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, var(--color-primary-light) 0%, var(--color-primary-deep) 100%); color: white; }

/* ---- 浮動層級控制 --------------------------------------- */
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: var(--color-primary-light); 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, var(--color-primary-light) 0%, var(--color-primary-deep) 100%); color: white; }
body.dark-mode .floating-level-toggle { border-color: var(--color-primary-light); background: linear-gradient(135deg, #2d2d2d 0%, #3a3a3a 100%); color: #ff91af; box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3); }
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); }

/* ---- 展開圖標 ------------------------------------------ */
body.dark-mode .toc-expand-icon { color: #ff91af; }
body.dark-mode .toc-expand-icon:hover { color: var(--color-primary-light); }

/* ---- TOC 項目懸停 --------------------------------------- */
body.dark-mode .toc-item.toc-expandable:hover { background-color: rgba(255, 105, 180, 0.15); }
body.dark-mode .toc-item:not(.toc-expandable):hover { background-color: rgba(255, 105, 180, 0.12); }

/* ---- TOC 層級鏈接顏色 ---------------------------------- */
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; }

/* 章節頁面目錄（提高優先級，使用 ul 結構選擇器）*/
body.dark-mode .toc > ul > li > a { color: #ff91af !important; }
body.dark-mode .toc ul ul > li > a { color: #ffb3c6 !important; }
body.dark-mode .toc ul ul ul > li > a { color: #ffc4d6 !important; }
body.dark-mode .toc ul ul ul ul > li > a { color: #ffd1e0 !important; }

/* ---- 章節特殊項 ----------------------------------------- */
body.dark-mode .toc-item.toc-chapter { border-bottom-color: #444; }

/* ---- 計數標記 ------------------------------------------ */
body.dark-mode .toc-count { color: #999; opacity: 0.8; }
body.dark-mode .chapter-qa-count { color: #999; opacity: 0.8; }

/* ---- 浮動 TOC 面板 ------------------------------------- */
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; }
body.dark-mode .floating-toc-item.level-h3 { color: #ffb3c6; }
body.dark-mode .floating-toc-item.level-h4 { color: #ffd1e0; }
body.dark-mode .floating-toc-item.level-h5 { color: #ffd1e0; }
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: var(--color-primary-light); }

/* ---- 書籤相關（TOC 面板內）----------------------------- */
body.dark-mode .bookmark-item { background: rgba(60, 60, 60, 0.5); border-color: #555; color: #ff91af; }
body.dark-mode .bookmark-item:hover { background: rgba(255, 105, 180, 0.15); border-color: var(--color-primary-light); }
body.dark-mode .bookmark-preview { color: #ff91af; }
body.dark-mode .bookmark-meta { color: #ccc; }
body.dark-mode .bookmark-questioner { color: var(--color-primary-light); }
body.dark-mode .bookmark-time { color: #a99; opacity: 0.7; }
/* ============================================================
   04c-qa-audio.css — QA 答疑章節專屬樣式
   來源橫幅、逐段 meta bar（播放鈕 + 校稿徽章）、開場白、底部浮動播放器。
   沿用 00-base.css 的設計 token，並提供暗色模式對應。
   置於 05-responsive.css 之前，讓其 @media 覆寫規則（如 .qa-player 行動版定位）
   能正確生效（同特異度時後者覆寫前者）。
   ============================================================ */

/* 章節頂部來源橫幅（連到線上校稿工具 qa/index.html） */
.qa-source-banner {
    margin: 16px 0 20px;
    padding: 10px 14px;
    background: rgba(248, 200, 220, 0.35);
    border: 1px solid var(--color-accent-pale);
    border-left: 4px solid var(--color-primary);
    border-radius: var(--radius-md);
    font-size: 0.92em;
}
.qa-source-banner a {
    color: var(--color-primary-deep);
    font-weight: 500;
}
.qa-source-banner a:hover { color: var(--color-primary-light); }

/* 每段答疑上方的工具列（不納入搜尋索引） */
.qa-meta-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin: 18px 0 6px;
}
.qa-meta-bar--opening { margin-top: 8px; }

.qa-number {
    font-weight: 700;
    color: var(--color-primary);
    font-size: 0.95em;
    min-width: 1.6em;
}

/* 播放按鈕 */
.qa-play {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 5px 12px 5px 10px;
    border: 1.5px solid var(--color-primary);
    background: rgba(248, 200, 220, 0.28);
    color: var(--color-primary-deep);
    border-radius: 999px;
    font-size: 0.84em;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    --qa-load-pct: 0%;
}
.qa-play:hover {
    background: var(--gradient-primary);
    color: #fff;
    border-color: transparent;
    box-shadow: var(--shadow-md);
}
.qa-play.playing {
    background: var(--gradient-primary);
    color: #fff;
    border-color: transparent;
}
.qa-play.loading {
    background: var(--gradient-primary);
    color: #fff;
    border-color: transparent;
    cursor: wait;
    box-shadow: var(--shadow-md);
}
/* 載入進度底色（由 --qa-load-pct 驅動） */
.qa-play.loading::before {
    content: '';
    position: absolute;
    inset: 0;
    width: var(--qa-load-pct);
    background: rgba(255, 255, 255, 0.22);
    transition: width 0.2s ease;
    pointer-events: none;
}
.qa-play .qa-play-icon,
.qa-play .qa-play-label {
    position: relative;
    z-index: 1;
}
.qa-play .qa-play-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    line-height: 1;
    color: var(--color-primary);
}
.qa-play:hover .qa-play-icon,
.qa-play.playing .qa-play-icon,
.qa-play.loading .qa-play-icon {
    color: #fff;
}
.qa-play-speaker {
    display: block;
    width: 1.2em;
    height: 1.2em;
}
.qa-play .qa-play-label { font-variant-numeric: tabular-nums; letter-spacing: 0.02em; }
.qa-play-icon--spinner {
    display: inline-block;
    width: 1em;
    height: 1em;
    border: 2px solid rgba(255, 255, 255, 0.35);
    border-top-color: #fff;
    border-radius: 50%;
    animation: qa-spin 0.7s linear infinite;
    vertical-align: -0.05em;
}
.qa-play-icon.qa-play-icon--spinner .qa-play-speaker {
    display: none;
}
@keyframes qa-spin {
    to { transform: rotate(360deg); }
}

.qa-play--disabled {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 5px 10px;
    border-radius: 999px;
    background: #f0e6eb;
    color: #b79aa8;
    font-size: 0.84em;
    cursor: not-allowed;
}
.qa-play--disabled .qa-play-speaker {
    width: 1.1em;
    height: 1.1em;
    opacity: 0.7;
}

/* 校稿狀態徽章 */
.qa-status {
    display: inline-flex;
    align-items: center;
    padding: 3px 9px;
    border-radius: 999px;
    font-size: 0.78em;
    font-weight: 500;
    white-space: nowrap;
}
.qa-status--proofread {
    background: rgba(76, 175, 80, 0.14);
    color: #2e7d32;
    border: 1px solid rgba(76, 175, 80, 0.3);
}
.qa-status--proofread::before { content: '✓ '; }
.qa-status--ai {
    background: rgba(255, 167, 38, 0.16);
    color: #b45309;
    border: 1px solid rgba(255, 167, 38, 0.35);
}
.qa-status--ai::before { content: '⚠ '; }

/* 開場白 */
.qa-opening {
    margin: 6px 0 10px;
    padding: 10px 14px;
    background: rgba(255, 248, 240, 0.7);
    border-radius: var(--radius-md);
    color: #555;
    font-size: 0.95em;
}

.qa-meta-bar--closing {
    margin: 14px 0 8px;
}

/* 底部浮動播放器 */
.qa-player {
    position: fixed;
    left: 50%;
    bottom: 16px;
    transform: translate(-50%, 140%);
    width: min(560px, calc(100% - 24px));
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    background: #fff;
    border: 1px solid var(--color-accent-pale);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: 10001;
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
    pointer-events: none;
}
.qa-player.visible {
    transform: translate(-50%, 0);
    opacity: 1;
    pointer-events: auto;
}
.qa-player-toggle,
.qa-player-close {
    flex: 0 0 auto;
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1em;
    transition: all 0.2s ease;
}
.qa-player-toggle {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: var(--shadow-sm);
}
.qa-player-toggle:hover { box-shadow: var(--shadow-md); transform: translateY(-1px); }
.qa-player-toggle.is-loading {
    color: transparent;
    pointer-events: none;
    position: relative;
}
.qa-player-toggle.is-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    margin: -8px 0 0 -8px;
    border: 2px solid rgba(255, 255, 255, 0.35);
    border-top-color: #fff;
    border-radius: 50%;
    animation: qa-spin 0.7s linear infinite;
}
.qa-player.is-loading .qa-player-skip {
    opacity: 0.45;
    pointer-events: none;
}
.qa-player.is-loading .qa-player-progress {
    cursor: wait;
}
.qa-player.is-loading .qa-player-range {
    color: var(--color-primary-deep);
}
.qa-player-progress.is-indeterminate .qa-player-progress-fill {
    width: 100% !important;
    transition: none;
    opacity: 0.55;
    animation: qa-progress-pulse 1.1s ease-in-out infinite;
}
.qa-player-progress.is-indeterminate .qa-player-progress-thumb {
    display: none;
}
@keyframes qa-progress-pulse {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.95; }
}
.qa-player-close {
    background: transparent;
    color: var(--color-primary-deep);
}
.qa-player-close:hover { background: rgba(248, 200, 220, 0.4); }

/* 音量控制（b站風格：滑鼠移上喇叭鈕彈出垂直音量滑桿，移走即收起；點擊切換靜音） */
.qa-player-volume-group {
    position: relative;
    flex: 0 0 auto;
    /* 位於 seek row 內，由該列 align-items: center 垂直置中 */
}
/* 彈出層與按鈕之間的 10px 空隙：用 ::before 橋接，滑鼠從按鈕移向滑桿不會中斷 hover */
.qa-player-volume-group::before {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    width: 44px;   /* 與彈出層同寬 */
    height: 10px;  /* 與彈出層下方的間距同高 */
    z-index: 0;
}
.qa-player-volume-btn {
    flex: 0 0 auto;
    width: 30px;
    height: 30px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    border-radius: 50%;
    cursor: pointer;
    line-height: 1;
    transition: background 0.2s ease;
}
.qa-player-volume-btn:hover { background: rgba(248, 200, 220, 0.4); }
/* 喇叭 SVG：原本字型大小 emoji 的 3/4，取主題粉紅色，日夜模式一致 */
.qa-player-volume-icon {
    width: 19px;    /* 24 × 0.8 ≈ 19px（約原本 1em 的 3/4） */
    height: 19px;
    display: block;
}
.qa-volume-symbol { fill: var(--color-primary); stroke: var(--color-primary); }
.qa-volume-waves, .qa-volume-muted { fill: none; stroke-width: 1.5; }
.qa-volume-muted { stroke-width: 1.8; }
.qa-player-volume-btn:hover .qa-volume-symbol,
.qa-player-volume-group.is-open .qa-volume-symbol {
    fill: var(--color-primary-light);
    stroke: var(--color-primary-light);
}
.qa-player-volume-popup {
    position: absolute;
    bottom: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%) translateY(4px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    width: 44px;
    height: 134px;
    padding: 10px 6px;
    box-sizing: border-box;
    background: #fff;
    border: 1px solid var(--color-accent-pale);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.15s ease, transform 0.15s ease, visibility 0.15s;
    z-index: 1;
}
.qa-player-volume-group.is-open .qa-player-volume-popup {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}
/* 目前音量數字（0–100），顯示在滑桿上方（b站風格） */
.qa-player-volume-value {
    font-size: 0.72em;
    font-variant-numeric: tabular-nums;
    line-height: 1;
    color: var(--color-primary-deep);
}
/* 包住旋轉滑桿的容器：保留視覺上的垂直空間（寬=厚度、高=長度） */
.qa-player-volume-track-wrap {
    position: relative;
    width: 20px;
    height: 88px;
}
.qa-player-volume {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 88px;   /* 旋轉後即為視覺上的垂直高度 */
    height: 20px;  /* 旋轉後即為視覺上的厚度 */
    margin: -10px 0 0 -44px;
    transform: rotate(-90deg);
    -webkit-appearance: none;
    appearance: none;
    background: transparent;
    cursor: pointer;
}
/* 軌道以 --qa-volume-pct 填色：已達到的音量用主色，其餘用底色 */
.qa-player-volume::-webkit-slider-runnable-track {
    height: 4px;
    border-radius: 2px;
    background: linear-gradient(to right,
        var(--color-primary) 0%,
        var(--color-primary) var(--qa-volume-pct, 100%),
        rgba(248, 200, 220, 0.5) var(--qa-volume-pct, 100%),
        rgba(248, 200, 220, 0.5) 100%);
}
.qa-player-volume::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 12px;
    height: 12px;
    margin-top: -4px;
    border-radius: 50%;
    background: var(--color-primary);
    box-shadow: var(--shadow-sm);
}
.qa-player-volume::-moz-range-track {
    height: 4px;
    border-radius: 2px;
    background: linear-gradient(to right,
        var(--color-primary) 0%,
        var(--color-primary) var(--qa-volume-pct, 100%),
        rgba(248, 200, 220, 0.5) var(--qa-volume-pct, 100%),
        rgba(248, 200, 220, 0.5) 100%);
}
.qa-player-volume::-moz-range-thumb {
    width: 12px;
    height: 12px;
    border: none;
    border-radius: 50%;
    background: var(--color-primary);
    box-shadow: var(--shadow-sm);
}
.qa-player-volume:focus-visible {
    outline: 2px solid var(--color-primary-light);
    outline-offset: 2px;
    border-radius: 4px;
}

.qa-player-info { flex: 1 1 auto; min-width: 0; }
.qa-player-file {
    font-weight: 600;
    color: var(--color-primary-deep);
    font-size: 0.88em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.qa-player-range {
    font-size: 0.78em;
    color: #888;
    font-variant-numeric: tabular-nums;
}
.qa-player-seek-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 6px;
}
.qa-player-skip {
    flex: 0 0 auto;
    padding: 3px 7px;
    border: 1px solid var(--color-accent-pale);
    background: #fff;
    color: var(--color-primary-deep);
    border-radius: var(--radius-sm, 4px);
    font-size: 0.72em;
    font-family: inherit;
    font-variant-numeric: tabular-nums;
    cursor: pointer;
    transition: all 0.2s ease;
    line-height: 1.2;
}
.qa-player-skip:hover {
    background: rgba(248, 200, 220, 0.45);
    border-color: var(--color-primary-light);
}
.qa-player-progress {
    flex: 1 1 auto;
    position: relative;
    height: 6px;
    background: rgba(248, 200, 220, 0.5);
    border-radius: 3px;
    cursor: pointer;
    touch-action: none;
}
.qa-player-progress-fill {
    display: block;
    height: 100%;
    width: 0;
    background: var(--gradient-primary);
    border-radius: 3px;
    transition: width 0.2s linear;
    pointer-events: none;
}
.qa-player-progress-thumb {
    position: absolute;
    top: 50%;
    left: 0;
    width: 12px;
    height: 12px;
    margin-top: -6px;
    margin-left: -6px;
    border-radius: 50%;
    background: var(--color-primary);
    box-shadow: var(--shadow-sm);
    transition: left 0.2s linear;
    pointer-events: none;
}
.qa-player-progress:hover .qa-player-progress-thumb,
.qa-player-progress:focus-visible .qa-player-progress-thumb {
    transform: scale(1.15);
}

/* ===== 暗色模式 ===== */
body.dark-mode .qa-source-banner {
    background: rgba(90, 45, 73, 0.4);
    border-color: #5a2d49;
    border-left-color: #ff91af;
}
body.dark-mode .qa-source-banner a { color: #ff91af; }
body.dark-mode .qa-number { color: #ff91af; }
body.dark-mode .qa-play {
    background: rgba(90, 45, 73, 0.45);
    color: #ffb3c6;
    border-color: #ff91af;
}
body.dark-mode .qa-play .qa-play-icon {
    color: #ff91af;
}
body.dark-mode .qa-play:hover,
body.dark-mode .qa-play.playing,
body.dark-mode .qa-play.loading {
    background: linear-gradient(135deg, #5a2d49 0%, var(--color-primary-light) 100%);
    color: #fff;
    border-color: transparent;
}
body.dark-mode .qa-play.loading {
    cursor: wait;
    box-shadow: var(--shadow-md);
}
body.dark-mode .qa-play.loading::before {
    background: rgba(255, 255, 255, 0.2);
}
body.dark-mode .qa-play-icon--spinner {
    border-color: rgba(255, 255, 255, 0.35);
    border-top-color: #fff;
}
body.dark-mode .qa-play--disabled { background: #3b2330; color: #7c6470; }
body.dark-mode .qa-status--proofread {
    background: rgba(76, 175, 80, 0.22);
    color: #9bd39e;
    border-color: rgba(76, 175, 80, 0.4);
}
body.dark-mode .qa-status--ai {
    background: rgba(255, 167, 38, 0.2);
    color: #ffcf99;
    border-color: rgba(255, 167, 38, 0.4);
}
body.dark-mode .qa-opening {
    background: rgba(74, 44, 58, 0.6);
    color: #e6c6d3;
}
body.dark-mode .qa-player {
    background: #4a2c3a;
    border-color: #5a2d49;
}
body.dark-mode .qa-player-file { color: #ff91af; }
body.dark-mode .qa-player-range { color: #c79bac; }
body.dark-mode .qa-player.is-loading .qa-player-range {
    color: #ffb3c6;
}
body.dark-mode .qa-player-close { color: #ffb3c6; }
body.dark-mode .qa-player-close:hover { background: rgba(90, 45, 73, 0.6); }
body.dark-mode .qa-player-volume-btn { color: #ffb3c6; }
body.dark-mode .qa-player-volume-btn:hover { background: rgba(90, 45, 73, 0.6); }
body.dark-mode .qa-volume-symbol { fill: #ff91af; stroke: #ff91af; }
body.dark-mode .qa-player-volume-btn:hover .qa-volume-symbol,
body.dark-mode .qa-player-volume-group.is-open .qa-volume-symbol { fill: #ffb3c6; stroke: #ffb3c6; }
body.dark-mode .qa-player-volume-popup { background: #4a2c3a; border-color: #5a2d49; }
body.dark-mode .qa-player-volume-value { color: #ff91af; }
body.dark-mode .qa-player-volume::-webkit-slider-runnable-track {
    background: linear-gradient(to right,
        #ff91af 0%,
        #ff91af var(--qa-volume-pct, 100%),
        rgba(90, 45, 73, 0.6) var(--qa-volume-pct, 100%),
        rgba(90, 45, 73, 0.6) 100%);
}
body.dark-mode .qa-player-volume::-webkit-slider-thumb { background: #ff91af; }
body.dark-mode .qa-player-volume::-moz-range-track {
    background: linear-gradient(to right,
        #ff91af 0%,
        #ff91af var(--qa-volume-pct, 100%),
        rgba(90, 45, 73, 0.6) var(--qa-volume-pct, 100%),
        rgba(90, 45, 73, 0.6) 100%);
}
body.dark-mode .qa-player-volume::-moz-range-thumb { background: #ff91af; }
body.dark-mode .qa-player-toggle {
    background: linear-gradient(135deg, #5a2d49 0%, var(--color-primary-light) 100%);
    color: #fff;
}
body.dark-mode .qa-player-toggle.is-loading::after {
    border-color: rgba(255, 255, 255, 0.35);
    border-top-color: #fff;
}
body.dark-mode .qa-player.is-loading .qa-player-skip {
    opacity: 0.4;
}
body.dark-mode .qa-player-skip {
    background: #3b2330;
    color: #ffb3c6;
    border-color: #5a2d49;
}
body.dark-mode .qa-player-skip:hover {
    background: rgba(90, 45, 73, 0.8);
    border-color: #ff91af;
}
body.dark-mode .qa-player-progress { background: rgba(90, 45, 73, 0.6); }
body.dark-mode .qa-player-progress-fill {
    background: linear-gradient(135deg, #5a2d49 0%, var(--color-primary-light) 100%);
}
body.dark-mode .qa-player-progress.is-indeterminate .qa-player-progress-fill {
    background: linear-gradient(90deg, #5a2d49, #ff91af, #5a2d49);
}
body.dark-mode .qa-player-progress-thumb { background: #ff91af; }
/* ============================================================
   04d-image-lightbox.css — 章節內嵌圖 lightbox（原圖／縮放／同頁切換）
   置於 05-responsive.css 之前，讓其 @media 可覆寫。
   ============================================================ */

img[src*="assets/images/"] {
    cursor: zoom-in;
}

.img-lightbox {
    position: fixed;
    inset: 0;
    z-index: 10000;
    display: none;
    flex-direction: column;
    background: rgba(20, 12, 18, 0.92);
    color: #fff;
    padding: env(safe-area-inset-top, 0) env(safe-area-inset-right, 0)
        env(safe-area-inset-bottom, 0) env(safe-area-inset-left, 0);
    -webkit-user-select: none;
    user-select: none;
    touch-action: none;
}

.img-lightbox.is-open {
    display: flex;
}

.img-lightbox__toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 12px;
    background: rgba(0, 0, 0, 0.45);
    border-bottom: 1px solid rgba(248, 200, 220, 0.25);
    flex-shrink: 0;
}

.img-lightbox__btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    min-height: 40px;
    padding: 6px 12px;
    border: 1.5px solid rgba(248, 200, 220, 0.55);
    background: rgba(231, 84, 128, 0.22);
    color: #fff;
    border-radius: var(--radius-md);
    font-size: 0.92em;
    font-family: inherit;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease, opacity 0.15s ease;
    white-space: nowrap;
}

.img-lightbox__btn[data-action="jump"] {
    background: rgba(231, 84, 128, 0.4);
    border-color: var(--color-primary-light);
    font-weight: 600;
}

.img-lightbox__btn:hover:not(:disabled) {
    background: rgba(231, 84, 128, 0.4);
    border-color: var(--color-primary-light);
}

.img-lightbox__btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.img-lightbox__counter {
    min-width: 4.5em;
    text-align: center;
    font-size: 0.9em;
    color: var(--color-accent-pale);
    padding: 0 4px;
}

.img-lightbox__stage {
    flex: 1;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: grab;
    min-height: 0;
}

.img-lightbox__stage.is-dragging {
    cursor: grabbing;
}

.img-lightbox__img {
    max-width: none;
    max-height: none;
    width: auto;
    height: auto;
    margin: 0;
    display: block;
    transform-origin: center center;
    will-change: transform;
    pointer-events: none;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
}

body.dark-mode .img-lightbox {
    background: rgba(8, 6, 10, 0.94);
}

body.dark-mode .img-lightbox__toolbar {
    background: rgba(0, 0, 0, 0.55);
    border-bottom-color: rgba(231, 84, 128, 0.35);
}

@media (max-width: 600px) {
    .img-lightbox__toolbar {
        gap: 6px;
        padding: 8px 10px;
    }

    .img-lightbox__btn {
        min-width: 44px;
        min-height: 44px;
        padding: 8px 10px;
        font-size: 0.88em;
    }
}
/* ========== 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: #888;
  font-size: 12px;
  font-family: 'Courier New', monospace;
  font-weight: normal;
  margin: 5px 0 15px 0;
  opacity: 0.85;
  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: 1.0;
}

/* 來源檔做成可下載連結：文字顏色維持不變，只加底線 */
p.source-filename a,
p.source-filename a:link,
p.source-filename a:visited,
p.source-filename a:hover,
p.source-filename a:active {
  color: inherit;
  text-decoration: underline;
  cursor: pointer;
}

/* 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;
  }
}

/* ============================================================
   搜尋 & 目錄 — 平板（≤768px）
   ============================================================ */
@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; }
    .search-scope-btn { font-size: 13px; padding: 7px 8px; }
    .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; }

    body { line-height: 1.7; }

    .toolbar-controls { gap: 10px; }
    .ctrl-btn.font-option { padding: 8px 18px; min-width: 55px; }

    .toc > ul > li { margin-bottom: 10px; }
    .toc ul ul > li { margin-bottom: 8px; }
    .toc ul ul ul > li { margin-bottom: 6px; }
    .toc ul ul ul ul > li { margin-bottom: 5px; }

    .toc-item.toc-level-1 > a { position: relative; }
    .toc-item.toc-level-2 > a { position: relative; }
    .toc-item.toc-level-3 > a { position: relative; }
    .toc-item.toc-level-4 > a { position: relative; }

    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; }

    .toc-level-btn, .floating-level-btn { font-size: 15px !important; min-width: 35px; min-height: 35px; }
    .toc-level-label { font-size: 15px !important; }

    .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; }
}

/* ============================================================
   浮動層級控制 — 寬屏（≥800px）垂直置中
   ============================================================ */
@media (min-width: 800px) {
  .floating-level-controls {
    right: auto;
    left: calc(75%);
    bottom: auto;
    top: 50%;
    transform: translateY(-50%);
  }
}

/* ============================================================
   手機（≤600px）
   ============================================================ */
@media (max-width: 600px) {
  .floating-level-controls {
    right: 15px;
    top: auto;
    bottom: 130px;
    padding: 15px 10px;
    max-width: 100px;
    z-index: 950 !important;
    background: rgba(255, 255, 255, 0.95);
    border: 2px solid rgba(255, 105, 180, 0.6);
    box-shadow: 0 6px 25px rgba(0, 0, 0, 0.2);
  }
  .floating-level-label { font-size: 12px; margin-bottom: 8px; font-weight: bold; }
  .floating-level-btn { width: 32px; height: 32px; font-size: 13px; margin: 3px 0; }
  .floating-level-toggle { width: 28px !important; height: 28px !important; font-size: 14px !important; border-width: 2px !important; }

  body { line-height: 1.8; }
  .toolbar-controls { gap: 12px; }
  .ctrl-btn.font-option { padding: 10px 20px; min-width: 60px; font-size: 13px; }

  .toc > ul > li { margin-bottom: 12px; }
  .toc ul ul > li { margin-bottom: 10px; }
  .toc ul ul ul > li { margin-bottom: 8px; }
  .toc ul ul ul ul > li { margin-bottom: 6px; }

  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; }

  .toc-level-btn, .floating-level-btn { font-size: 16px !important; min-width: 38px; min-height: 38px; }
  .toc-level-label { font-size: 16px !important; }

  /* QA 底部浮動播放器：小螢幕全寬貼底 */
  .qa-player {
    left: 8px;
    right: 8px;
    bottom: 8px;
    width: auto;
    transform: translateY(140%);
  }
  .qa-player.visible { transform: translateY(0); }
  .qa-play .qa-play-label { font-size: 0.95em; }
}

/* ============================================================
   小手機（≤400px）
   ============================================================ */
@media (max-width: 400px) {
  .floating-level-controls {
    right: 10px;
    bottom: 125px;
    padding: 18px 12px;
    max-width: 110px;
    z-index: 950 !important;
    background: rgba(255, 255, 255, 0.98) !important;
    border: 3px solid rgba(255, 105, 180, 0.8) !important;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3) !important;
  }
  .floating-level-label { font-size: 13px !important; margin-bottom: 10px !important; font-weight: bold !important; color: var(--color-primary-deep) !important; }
  .floating-level-btn { width: 36px !important; height: 36px !important; font-size: 14px !important; margin: 4px 0 !important; border-width: 3px !important; }
  .floating-level-toggle { width: 32px !important; height: 32px !important; font-size: 16px !important; border-width: 3px !important; }

  body { line-height: 1.9; }
  .toc > ul > li { margin-bottom: 14px; }
  .toc ul ul > li { margin-bottom: 12px; }
  .toc ul ul ul > li { margin-bottom: 10px; }
  .toc ul ul ul ul > li { margin-bottom: 8px; }

  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; }

  .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; }

  .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; }
}