.aitopics-container {
    margin: 0 auto;
    padding: 20px;
}

/* L字形布局 */
.aitopics-layout {
    display: grid;
    grid-template-columns: 1fr 800px;
    grid-template-rows: auto auto;
    gap: 30px;
    margin-bottom: 40px;
}

/* 顶级主题区域 - 占据右侧 */
.aitopics-main-topic-area {
    grid-column: 2;
    grid-row: 1;
    border-radius: 20px;
    padding: 5px 40px 40px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    border: 3px solid #dc3545;
}

.aitopics-main-topic-title {
    margin: 0 auto!important;
    justify-content: center!important;
    width: 100%!important;
    font-size: 2.5em;
    color: #dc3545;
    text-align: center;
    margin-top: 50px!important;
    margin-bottom: 0px!important;
    font-weight: bold;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
    background: linear-gradient(135deg, #e9ecef 0%, #f8f9fa 50%, #e9ecef 100%);
    width: calc(100% + 80px);
    padding: 10px;
    margin-left: -40px;
    margin-right: -40px;
    margin-top: -40px;
    position: relative;
    left: 0;
    right: 0;
}

/* 装饰边框 */
.aitopics-decorative-border {
    width: 100%;
    height: 30px;
    margin: 0px auto 0px auto;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.aitopics-decorative-border::before {
    content: '◆ ● ▲ ◆ ● ▲ ◆ ● ▲ ◆ ● ▲ ◆ ● ▲ ◆ ● ▲ ◆ ● ▲ ◆ ● ▲ ◆ ● ▲ ◆ ● ▲';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 16px;
    color: red;
    letter-spacing: 8px;
    opacity: 0.8;
    white-space: nowrap;
    animation: decorativeBorderFlow 90s linear infinite;
}

.aitopics-decorative-border::after {
    content: '✦ ❋ ✧ ❈ ✦ ❋ ✧ ❈ ✦ ❋ ✧ ❈ ✦ ❋ ✧ ❈ ✦ ❋ ✧ ❈ ✦ ❋ ✧ ❈';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 16px;
    color: green;
    letter-spacing: 12px;
    opacity: 0.6;
    white-space: nowrap;
    animation: decorativeBorderFlow 75s linear infinite reverse;
}

@keyframes decorativeBorderFlow {
    0% {
        transform: translate(-50%, -50%) translateX(-100%);
    }
    100% {
        transform: translate(-50%, -50%) translateX(100%);
    }
}

/* 照片区域 */
.aitopics-photos-wrapper {
    position: relative;
    margin: 5px 0;
}

.aitopics-culture-photos-container {
    display: flex;
    overflow-x: auto;
    gap: 15px;
    padding: 10px 0;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.aitopics-culture-photos-container::-webkit-scrollbar {
    display: none;
}

.aitopics-culture-photo-item {
    flex: 0 0 200px;
    height: 150px;
    overflow: hidden;
    transition: all 0.3s ease;
    position: relative;
    cursor: pointer;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.aitopics-culture-photo-item::before {
    content: '';
    position: absolute;
    top: 5px;
    left: 5px;
    width: calc(100% - 10px);
    height: calc(100% - 10px);
    border: 2px solid rgba(255,255,255,0.8);
    pointer-events: none;
    z-index: 10;
    box-sizing: border-box;
    border-radius: 6px;
}

/* 放大镜图标提示 */
.aitopics-culture-photo-item::after {
    content: '🔍';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 24px;
}

/* コンテンツ切り替え用のスタイル - 優雅な書籍ページスタイル */
.aitopics-content-inner {
    background: linear-gradient(135deg, #fefefe 0%, #f9f9f9 50%, #fefefe 100%);
    border-radius: 0;
    padding: 60px 80px;
    margin: 20px auto;
    margin-top: 0;
    max-width: 1200px;
    min-height: 1200px;
    border: none;
    position: relative;
    font-family: 'Georgia', 'Times New Roman', serif;
    line-height: 1.8;
    color: #2c2c2c;
}
.aitopics-content-inner-notinuse {
    background: linear-gradient(135deg, #fefefe 0%, #f9f9f9 50%, #fefefe 100%);
    border-radius: 0;
    padding: 60px 80px;
    margin: 40px auto;
    max-width: 900px;
    border: none;
    box-shadow: 
        0 0 0 1px rgba(0,0,0,0.05),
        0 8px 32px rgba(0,0,0,0.08),
        inset 0 1px 0 rgba(255,255,255,0.9);
    position: relative;
    font-family: 'Georgia', 'Times New Roman', serif;
    line-height: 1.8;
    color: #2c2c2c;
}

/* 书页装饰边框 */
.aitopics-content-inner::before {
    content: '';
    position: absolute;
    top: 0px;
    left: 0px;
    right: 0px;
    bottom: 0px;
    border: 2px solid #d4af37;
    border-radius: 4px;
    opacity: 0.3;
    pointer-events: none;
}

/* 书页内边框装饰 */
.aitopics-content-inner::after {
    content: '';
    position: absolute;
    top: 10px;
    left: 10px;
    right: 10px;
    bottom: 10px;
    border: 1px solid #d4af37;
    border-radius: 2px;
    opacity: 0.2;
    pointer-events: none;
}

.aitopics-content-header {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    gap: 15px;
}

.aitopics-back-to-nav {
    background: #007cba;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s ease;
}

.aitopics-back-to-nav:hover {
    background: #005a87;
}

.aitopics-content-title {
    margin: 0;
    color: #333;
    font-size: 1.2em;
}

/* 书籍风格的内容区域 */
.aitopics-content-inner .aitopics-content-body,
.aitopics-content-inner {
    line-height: 1.8;
    color: #2c2c2c;
    font-size: 16px;
    text-align: justify;
    position: relative;
    z-index: 1;
}

/* 强制覆盖系统标题样式 - 优雅书籍风格 */
.aitopics-content-inner h1,
.aitopics-content-inner h2,
.aitopics-content-inner h3,
.aitopics-content-inner h4,
.aitopics-content-inner h5,
.aitopics-content-inner h6 {
    font-family: 'Georgia', 'Times New Roman', serif !important;
    color: #1a1a1a !important;
    font-weight: 600 !important;
    text-align: center !important;
    margin: 2.5em auto 1.5em auto !important;
    padding: 0 !important;
    border: none !important;
    background: none !important;
    text-shadow: none !important;
    position: relative !important;
    z-index: 1 !important;
}

.aitopics-content-inner h1 {
    font-size: 2.2em !important;
    margin-top: 1em !important;
    margin-bottom: 2em !important;
    border-bottom: 3px double #d4af37 !important;
    padding-bottom: 0.5em !important;
    letter-spacing: 0.05em !important;
}

.aitopics-content-inner h2 {
    font-size: 1.8em !important;
    color: #8b4513 !important;
    margin-top: 2em !important;
    margin-bottom: 1.2em !important;
    border-bottom: 1px solid #d4af37 !important;
    padding-bottom: 0.3em !important;
    letter-spacing: 0.03em !important;
}

.aitopics-content-inner h3 {
    font-size: 1.4em !important;
    color: #654321 !important;
    margin-top: 1.8em !important;
    margin-bottom: 1em !important;
    font-style: italic !important;
    letter-spacing: 0.02em !important;
}

.aitopics-content-inner h4 {
    font-size: 1.2em !important;
    color: #8b4513 !important;
    margin-top: 1.5em !important;
    margin-bottom: 0.8em !important;
    text-decoration: underline !important;
    text-decoration-color: #d4af37 !important;
    text-underline-offset: 0.3em !important;
}

.aitopics-content-inner h5,
.aitopics-content-inner h6 {
    font-size: 1.1em !important;
    color: #654321 !important;
    margin-top: 1.2em !important;
    margin-bottom: 0.6em !important;
    font-weight: 500 !important;
}

/* 段落样式 */
.aitopics-content-inner p {
    margin-bottom: 1.5em !important;
    text-indent: 2em !important;
    line-height: 1.8 !important;
    color: #2c2c2c !important;
    font-size: 16px !important;
    text-align: justify !important;
}

.aitopics-content-inner p:first-of-type {
    text-indent: 0 !important;
    font-size: 1.1em !important;
    color: #1a1a1a !important;
    margin-bottom: 2em !important;
}

/* 列表样式 */
.aitopics-content-inner ul,
.aitopics-content-inner ol {
    margin: 1.5em 0 !important;
    padding-left: 3em !important;
    line-height: 1.8 !important;
}

.aitopics-content-inner li {
    margin-bottom: 0.8em !important;
    color: #2c2c2c !important;
}

/* 引用样式 */
.aitopics-content-inner blockquote {
    margin: 2em 0 !important;
    padding: 1.5em 2em !important;
    border-left: 4px solid #d4af37 !important;
    background: rgba(212, 175, 55, 0.05) !important;
    font-style: italic !important;
    color: #654321 !important;
    position: relative !important;
    z-index: 1 !important;
}

/* 强调文本 */
.aitopics-content-inner strong,
.aitopics-content-inner b {
    color: #8b4513 !important;
    font-weight: 600 !important;
}

.aitopics-content-inner em,
.aitopics-content-inner i {
    color: #654321 !important;
    font-style: italic !important;
}

/* 首字母装饰效果 */
.aitopics-content-inner p:first-of-type:first-letter {
    float: left !important;
    font-size: 4em !important;
    line-height: 0.8 !important;
    padding: 0.1em 0.1em 0 0 !important;
    margin: 0.1em 0.2em 0 0 !important;
    color: #8b4513 !important;
    font-family: 'Georgia', serif !important;
    font-weight: bold !important;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1) !important;
}

/* 分隔线装饰 */
.aitopics-content-inner hr {
    border: none !important;
    height: 1px !important;
    background: linear-gradient(to right, transparent, #d4af37, transparent) !important;
    margin: 3em auto !important;
    width: 60% !important;
    position: relative !important;
}

.aitopics-content-inner hr::before {
    content: '❦' !important;
    position: absolute !important;
    top: -0.7em !important;
    left: 50% !important;
    transform: translateX(-50%) !important;
    background: #fefefe !important;
    padding: 0 1em !important;
    color: #d4af37 !important;
    font-size: 1.2em !important;
}

/* 代码块样式 */
.aitopics-content-inner code {
    background: rgba(212, 175, 55, 0.1) !important;
    padding: 0.2em 0.4em !important;
    border-radius: 3px !important;
    font-family: 'Courier New', monospace !important;
    color: #654321 !important;
    font-size: 0.9em !important;
}

.aitopics-content-inner pre {
    background: rgba(212, 175, 55, 0.05) !important;
    border: 1px solid rgba(212, 175, 55, 0.3) !important;
    border-radius: 5px !important;
    padding: 1.5em !important;
    margin: 2em 0 !important;
    overflow-x: auto !important;
    position: relative !important;
    z-index: 1 !important;
}

/* 链接样式 */
.aitopics-content-inner a {
    color: #8b4513 !important;
    text-decoration: none !important;
    border-bottom: 1px dotted #d4af37 !important;
    transition: all 0.3s ease !important;
}

.aitopics-content-inner a:hover {
    color: #654321 !important;
    border-bottom: 1px solid #d4af37 !important;
    background: rgba(212, 175, 55, 0.1) !important;
}

/* 表格样式 */
.aitopics-content-inner table {
    width: 100% !important;
    border-collapse: collapse !important;
    margin: 2em 0 !important;
    font-size: 0.95em !important;
    position: relative !important;
    z-index: 1 !important;
}

.aitopics-content-inner th,
.aitopics-content-inner td {
    padding: 0.8em 1em !important;
    text-align: left !important;
    border-bottom: 1px solid rgba(212, 175, 55, 0.3) !important;
}

.aitopics-content-inner th {
    background: rgba(212, 175, 55, 0.1) !important;
    font-weight: 600 !important;
    color: #654321 !important;
    border-bottom: 2px solid #d4af37 !important;
}

/* 图片样式 */
.aitopics-content-inner img {
    max-width: 100% !important;
    height: auto !important;
    margin: 2em auto !important;
    display: block !important;
    border-radius: 5px !important;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1) !important;
    position: relative !important;
    z-index: 1 !important;
}

/* 固定高度内容滚动容器 */
.aitopics-scroll-container {
    position: relative;
    height: 1800px;
    overflow: hidden;
    border-radius: 8px;
}

/* 可滚动的内容区域 */
.aitopics-scrollable-content {
    position: relative;
    transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    transform: translateY(0);
    padding-bottom: 100px;
}

/* 顶部渐变遮罩 - 当内容向上移动时显示 */
.aitopics-top-fade {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: linear-gradient(rgba(254, 254, 254, 1) 0%, rgba(254, 254, 254, 0.8) 50%, transparent 100%);
    pointer-events: none;
    z-index: 10;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.aitopics-scroll-container.scrolled .aitopics-top-fade {
    opacity: 0;
}

/* 底部渐变遮罩 - 提示还有更多内容 */
.aitopics-bottom-fade {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100px;
    background: linear-gradient(transparent 0%, rgba(254, 254, 254, 0.7) 40%, rgba(254, 254, 254, 0.95) 80%, rgba(254, 254, 254, 1) 100%);
    pointer-events: none;
    z-index: 10;
    opacity: 1;
    transition: opacity 0.4s ease;
}

.aitopics-scroll-container.at-bottom .aitopics-bottom-fade {
    opacity: 0;
}

/* 滚动指示器 */
.aitopics-scroll-indicator {
    position: absolute;
    right: -20px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 200px;
    background: rgba(139, 69, 19, 0.1);
    border-radius: 2px;
    z-index: 15;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.aitopics-scroll-container:hover .aitopics-scroll-indicator {
    opacity: 1;
}

.aitopics-scroll-thumb {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(139, 69, 19, 0.4);
    border-radius: 2px;
    transition: all 0.3s ease;
    min-height: 20px;
}

/* 滚动提示文字 */
.aitopics-scroll-hint {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(139, 69, 19, 0.2);
    border-radius: 12px;
    padding: 4px 12px;
    font-family: Georgia, serif;
    font-size: 12px;
    color: rgba(139, 69, 19, 0.6);
    z-index: 12;
    backdrop-filter: blur(3px);
    opacity: 1;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

.aitopics-scroll-container.scrolled .aitopics-scroll-hint,
.aitopics-scroll-container.at-bottom .aitopics-scroll-hint {
    opacity: 0;
}

.aitopics-scroll-hint::before {
    content: '↓';
    margin-right: 3px;
    font-size: 11px;
    animation: gentle-float 2s infinite;
}

@keyframes gentle-float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(1px); }
}

/* 响应式调整 */
@media (max-width: 768px) {
    .aitopics-content-inner {
        padding: 40px 30px !important;
        margin: 20px auto !important;
        font-size: 15px !important;
    }
    
    .aitopics-content-inner h1 {
        font-size: 1.8em !important;
    }
    
    .aitopics-content-inner h2 {
        font-size: 1.5em !important;
    }
    
    .aitopics-content-inner h3 {
        font-size: 1.3em !important;
    }
    
    .aitopics-content-inner p {
        text-indent: 1.5em !important;
        font-size: 15px !important;
    }
    
    .aitopics-content-inner p:first-of-type:first-letter {
        font-size: 3em !important;
    }
}

.aitopics-sections-list a {
    text-decoration: none;
    color: #007cba;
    transition: color 0.3s ease;
}

.aitopics-sections-list a:hover {
    color: #005a87;
    text-decoration: underline;
}

.aitopics-culture-photo-item:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(0,0,0,0.2);
}

.aitopics-culture-photo-item:hover::after {
    opacity: 1;
}

.aitopics-culture-photo-item img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: 8px;
    transition: filter 0.3s ease;
}

.aitopics-culture-photo-item:hover img {
    filter: brightness(0.8);
}

.aitopics-scroll-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0,0,0,0.3);
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer;
    z-index: 15;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s ease;
}

.aitopics-scroll-arrow:hover {
    background: rgba(0,0,0,0.5);
}

.aitopics-scroll-arrow.left {
    left: -30px;
}

.aitopics-scroll-arrow.right {
    right: -30px;
}

/* 照片提示文本 */
.aitopics-photo-hint {
    text-align: center;
    margin-top: 10px;
    color: #6c757d;
    font-size: 0.9em;
    font-style: italic;
    opacity: 0.8;
}

/* 章节导航 - 优雅书籍风格 */
.aitopics-sections-nav {
    background: linear-gradient(135deg, #fefefe 0%, #f9f9f9 50%, #fefefe 100%);
    border-radius: 0;
    padding: 60px 80px;
    margin: 20px auto;
    margin-top: 0;
    max-width: 1200px;
    min-height: 1200px;    
    border: none;
    position: relative;
    font-family: 'Georgia', 'Times New Roman', serif;
}

/* 章节导航固定高度滚动容器 */
.aitopics-sections-scroll-container {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
}

/* 章节导航可滚动的内容区域 */
.aitopics-sections-scrollable-content {
    position: relative;
    transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    transform: translateY(0);
    padding-bottom: 100px;
}

/* 章节导航顶部渐变遮罩 */
.aitopics-sections-top-fade {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: linear-gradient(rgba(254, 254, 254, 1) 0%, rgba(254, 254, 254, 0.8) 50%, transparent 100%);
    pointer-events: none;
    z-index: 10;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.aitopics-sections-scroll-container.scrolled .aitopics-sections-top-fade {
    opacity: 0;
}

/* 章节导航底部渐变遮罩 */
.aitopics-sections-bottom-fade {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100px;
    background: linear-gradient(transparent 0%, rgba(254, 254, 254, 0.7) 40%, rgba(254, 254, 254, 0.95) 80%, rgba(254, 254, 254, 1) 100%);
    pointer-events: none;
    z-index: 10;
    opacity: 1;
    transition: opacity 0.4s ease;
}

.aitopics-sections-scroll-container.at-bottom .aitopics-sections-bottom-fade {
    opacity: 0;
}

/* 章节导航滚动指示器 */
.aitopics-sections-scroll-indicator {
    position: absolute;
    right: -20px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 200px;
    background: rgba(139, 69, 19, 0.1);
    border-radius: 2px;
    z-index: 15;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.aitopics-sections-scroll-container:hover .aitopics-sections-scroll-indicator {
    opacity: 1;
}

.aitopics-sections-scroll-thumb {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(139, 69, 19, 0.4);
    border-radius: 2px;
    transition: all 0.3s ease;
    min-height: 20px;
}

/* 章节导航滚动提示文字 */
.aitopics-sections-scroll-hint {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(139, 69, 19, 0.2);
    border-radius: 12px;
    padding: 4px 12px;
    font-family: Georgia, serif;
    font-size: 12px;
    color: rgba(139, 69, 19, 0.6);
    z-index: 12;
    backdrop-filter: blur(3px);
    opacity: 1;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

.aitopics-sections-scroll-container.scrolled .aitopics-sections-scroll-hint,
.aitopics-sections-scroll-container.at-bottom .aitopics-sections-scroll-hint {
    opacity: 0;
}

.aitopics-sections-scroll-hint::before {
    content: '↓';
    margin-right: 3px;
    font-size: 11px;
    animation: gentle-float 2s infinite;
}
.aitopics-sections-nav000 {
    background: linear-gradient(135deg, #fefefe 0%, #f9f9f9 50%, #fefefe 100%);
    border-radius: 0;
    padding: 60px 80px;
    margin: 40px auto;
    max-width: 900px;
    border: none;
    box-shadow: 
        0 0 0 1px rgba(0,0,0,0.05),
        0 8px 32px rgba(0,0,0,0.08),
        inset 0 1px 0 rgba(255,255,255,0.9);
    position: relative;
    font-family: 'Georgia', 'Times New Roman', serif;
}

/* 章节导航装饰边框 */
.aitopics-sections-nav::before {
    content: '';
    position: absolute;
    top: 0px;
    left: 0px;
    right: 0px;
    bottom: 0px;
    border: 2px solid #8b4513;
    border-radius: 4px;
    opacity: 0.3;
    pointer-events: none;
}

.aitopics-sections-nav::after {
    content: '';
    position: absolute;
    top: 8px;
    left: 8px;
    right: 8px;
    bottom: 8px;
    border: 1px solid #8b4513;
    border-radius: 2px;
    opacity: 0.2;
    pointer-events: none;
}

.aitopics-sections-nav-inner {
    margin: 0;
    position: relative;
    z-index: 1;
}

.aitopics-sections-nav h3 {
    color: #8b4513 !important;
    margin-bottom: 30px !important;
    font-size: 2em !important;
    text-align: center !important;
    font-family: 'Georgia', 'Times New Roman', serif !important;
    font-weight: 600 !important;
    border-bottom: 3px double #d4af37 !important;
    padding-bottom: 15px !important;
    letter-spacing: 0.05em !important;
    text-shadow: none !important;
    background: none !important;
}

.aitopics-sections-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.aitopics-sections-list li {
    margin: 20px 0;
    padding: 0;
    position: relative;
}

/* 二级标题样式 - 优雅书籍风格 */
.aitopics-sections-list li.level-2 {
    font-size: 1.6em !important;
    font-weight: 600 !important;
    color: #654321 !important;
    font-family: 'Georgia', 'Times New Roman', serif !important;
    text-align: center !important;
    margin: 45px 0 20px 0 !important;
    padding: 15px 0 !important;
    border-bottom: 1px solid #d4af37 !important;
    letter-spacing: 0.03em !important;
    position: relative !important;
}

.aitopics-sections-list li.level-2::before {
    content: '◆';
    position: absolute;
    left: 50%;
    top: -10px;
    transform: translateX(-50%);
    color: #d4af37;
    font-size: 0.8em;
    background: #fefefe;
    padding: 0 10px;
}

/* 三级标题样式 - 优雅书籍风格 */
.aitopics-sections-list li.level-3 {
    padding-left: 60px !important;
    color: #8b4513 !important;
    font-size: 1.2em !important;
    font-family: 'Georgia', 'Times New Roman', serif !important;
    font-style: italic !important;
    margin: 15px 0 !important;
    position: relative !important;
    line-height: 1.6 !important;
}

.aitopics-sections-list li.level-3::before {
    content: '❦';
    position: absolute;
    left: 30px;
    color: #d4af37;
    font-size: 0.9em;
    top: 50%;
    transform: translateY(-50%);
}

/* 链接样式 - 优雅书籍风格 */
.aitopics-sections-list a {
    text-decoration: none !important;
    color: inherit !important;
    transition: all 0.3s ease !important;
    display: block !important;
    padding: 8px 0 !important;
    border-bottom: 1px dotted transparent !important;
}

.aitopics-sections-list a:hover {
    color: #654321 !important;
    border-bottom: 1px dotted #d4af37 !important;
    background: rgba(212, 175, 55, 0.05) !important;
    transform: translateX(5px) !important;
}

.aitopics-sections-list li.level-2 a:hover {
    transform: none !important;
    background: rgba(212, 175, 55, 0.1) !important;
}

.aitopics-sections-list li.level-3 a:hover {
    padding-left: 10px !important;
}

/* 子主题列表 - 书页风格 */
.aitopics-sub-topics-list {
    background: linear-gradient(135deg, #fefefe 0%, #f8f8f8 25%, #ffffff 50%, #f8f8f8 75%, #fefefe 100%) !important;
    border-radius: 0px !important;
    padding: 40px 30px !important;
    padding-bottom: 15px !important;
    margin: 30px 0 !important;
    margin-bottom: 0 !important;
    border: 1px solid rgba(139, 69, 19, 0.1) !important;
    position: relative !important;
    font-family: Georgia, "Times New Roman", serif !important;
}

.aitopics-sub-topics-list::before {
    content: "" !important;
    position: absolute !important;
    top: 0px !important;
    left: 0px !important;
    right: 0px !important;
    bottom: 0px !important;
    border: 2px solid rgba(139, 69, 19, 0.15) !important;
    border-radius: 3px !important;
    pointer-events: none !important;
}

.aitopics-sub-topics-list::after {
    content: "" !important;
    position: absolute !important;
    top: 8px !important;
    left: 8px !important;
    right: 8px !important;
    bottom: 8px !important; 
    border: 1px solid rgba(139, 69, 19, 0.08) !important;
    border-radius: 2px !important;
    pointer-events: none !important;
}

.aitopics-sub-topics-list h3 {
    color: #2c1810 !important;
    margin-bottom: 30px !important;
    font-size: 1.5em !important;
    font-family: Georgia, "Times New Roman", serif !important;
    font-weight: 600 !important;
    text-align: center !important;
    border-bottom: 3px double rgba(139, 69, 19, 0.3) !important;
    padding-bottom: 15px !important;
    position: relative !important;
    letter-spacing: 0.5px !important;
}

.aitopics-sub-topics-list h3::before {
    content: "❦" !important;
    position: absolute !important;
    left: 50% !important;
    bottom: -12px !important;
    transform: translateX(-50%) !important;
    background: linear-gradient(135deg, #fefefe 0%, #f8f8f8 25%, #ffffff 50%, #f8f8f8 75%, #fefefe 100%) !important;
    color: rgba(139, 69, 19, 0.6) !important;
    font-size: 16px !important;
    padding: 0 8px !important;
}

.aitopics-topics-text-list {
    list-style: none !important;
    padding: 0 !important;
    margin: 0 !important;
    display: grid !important;
    grid-template-columns: 1fr 1fr !important;
    gap: 20px 25px !important;
    font-family: Georgia, "Times New Roman", serif !important;
}

.aitopics-topics-text-list li {
    margin: 0 !important;
    padding: 18px 2px !important;
    background: linear-gradient(135deg, #fefefe 0%, #f9f9f9 25%, #ffffff 50%, #f9f9f9 75%, #fefefe 100%) !important;
    border-radius: 6px !important;
    border: 1px solid rgba(139, 69, 19, 0.15) !important;
    border-left: 4px solid rgba(139, 69, 19, 0.4) !important;
    box-shadow: 
        0 3px 12px rgba(0,0,0,0.08),
        inset 0 1px 0 rgba(255,255,255,0.6) !important;
    transition: all 0.3s ease !important;
    position: relative !important;
}

.aitopics-topics-text-list li::before {
    content: "◦" !important;
    position: absolute !important;
    left: 8px !important;
    top: 50% !important;
    transform: translateY(-50%) !important;
    color: rgba(139, 69, 19, 0.5) !important;
    font-size: 12px !important;
}

.aitopics-topics-text-list li:hover {
    transform: translateY(-3px) !important;
    box-shadow: 
        0 6px 20px rgba(0,0,0,0.12),
        inset 0 1px 0 rgba(255,255,255,0.8) !important;
    border-left-color: rgba(139, 69, 19, 0.7) !important;
    background: linear-gradient(135deg, #ffffff 0%, #fafafa 25%, #ffffff 50%, #fafafa 75%, #ffffff 100%) !important;
}

.aitopics-topics-text-list a {
    text-decoration: none !important;
    color: #3c2415 !important;
    font-size: 1.05em !important;
    transition: all 0.3s ease !important;
    display: block !important;
    font-weight: 500 !important;
    white-space: nowrap !important;
    font-family: Georgia, "Times New Roman", serif !important;
    padding-left: 15px !important;
    line-height: 1.4 !important;
}

.aitopics-topics-text-list a:hover {
    color: #8b4513 !important;
    font-weight: 600 !important;
}

/* 隐藏的主题项 */
.aitopics-topics-text-list .aitopics-topic-hidden {
    display: none !important;
}

/* 展开/折叠按钮 - 带装饰线的文本样式 */
.aitopics-expand-button {
  display: inline-flex; /* inline-flex 才能被 text-align:center 控制 */
  justify-content: center;
  align-items: center;
  padding: 18px 0;
  font-size: 16px;
  font-weight: 400;
  background: none;
  color: #6c757d;
  border: none;
  cursor: pointer;
  text-decoration: none;
  font-family: inherit;
  line-height: 1.5;
  white-space: nowrap;
  position: relative;
}

/* 左右横线（不影响布局） */
.aitopics-expand-button::before,
.aitopics-expand-button::after {
  content: "";
  position: absolute;
  top: 50%;
  height: 1px;
  width: 70%;
  transform: translateY(-50%);
  background: linear-gradient(to right, transparent, #ced4da 20%, #ced4da 80%, transparent);
  transition: background 0.2s ease;
  pointer-events: none;
}

.aitopics-expand-button::after {
  left: auto;
  right: -80%;
  background: linear-gradient(to left, transparent, #ced4da 20%, #ced4da 80%, transparent);
}

.aitopics-expand-button::before {
  left: -80%;
}

/* 中间按钮内容 */
.aitopics-expand-button .button-text {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  position: relative;
  z-index: 1; /* 确保文字在装饰线之上 */
  white-space: nowrap;
}

/* 左侧箭头符号 */
.aitopics-expand-button .button-text::before {
  content: "▼";
  font-size: 12px;
  color: #adb5bd;
  transition: transform 0.2s ease, color 0.2s ease;
  margin-right: 4px;
}

/* 右侧箭头符号 */
.aitopics-expand-button .button-text::after {
  content: "▼";
  font-size: 12px;
  color: #adb5bd;
  transition: transform 0.2s ease, color 0.2s ease;
  margin-left: 4px;
}

/* 展开与收起文字 */
.aitopics-expand-button .expand-text,
.aitopics-expand-button .collapse-text {
  display: inline;
}

/* 鼠标悬停时颜色变化 */
.aitopics-expand-button:hover {
  color: #495057;
}

.aitopics-expand-button:hover::before,
.aitopics-expand-button:hover::after {
  background: linear-gradient(to right, transparent, #adb5bd 20%, #adb5bd 80%, transparent);
}

.aitopics-expand-button:hover::after {
  background: linear-gradient(to left, transparent, #adb5bd 20%, #adb5bd 80%, transparent);
}

.aitopics-expand-button:hover .button-text::before,
.aitopics-expand-button:hover .button-text::after {
  color: #6c757d;
}

/* 展开状态箭头旋转 */
.aitopics-expand-button.expanded .button-text::before {
  transform: rotate(180deg);
}

.aitopics-expand-button.expanded .button-text::after {
  transform: rotate(180deg);
}


/* 展开按钮容器 */
.aitopics-expand-toggle {
    text-align: center;
    margin-top: 15px;
    width: 100%;
    display: block;
}

/* 返回链接 - 书页注脚风格 */
.aitopics-back-to-main-topic {
    position: relative;
    margin-top: 70px !important;
    padding-top: 15px !important;
    padding-bottom: 15px !important;
    text-align: right !important;
    padding-right: 20px !important;
}

.aitopics-back-to-main-topic::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 95%;
    height: 1px;
    background: #b8860b;
    opacity: 0.8;
}

.aitopics-back-to-main-btn {
    display: inline-block !important;
    background: none !important;
    color: #ffd700 !important;
    padding: 0 !important;
    border: none !important;
    border-radius: 0 !important;
    text-decoration: none !important;
    transition: all 0.3s ease !important;
    font-family: Georgia, "Times New Roman", serif !important;
    font-weight: 400 !important;
    font-size: 1.5em !important;
    font-style: italic !important;
    box-shadow: none !important;
    letter-spacing: 0.3px !important;
    margin-top: 0 !important;
    position: relative;
    transform: translateY(1px) !important;
    text-shadow: 
        1px 1px 0 #cc9900,
        2px 2px 0 #b8941f,
        3px 3px 0 #a0821b,
        3px 3px 4px rgba(0, 0, 0, 0.08) !important;
}

.aitopics-back-to-main-btn:hover {
    color: #d4af37 !important;
    transform: translateY(0) !important;
    box-shadow: none !important;
    text-decoration: none !important;
    text-shadow: 
        1px 1px 0 #b8941f,
        2px 2px 0 #a0821b,
        3px 3px 0 #887017,
        4px 4px 6px rgba(0, 0, 0, 0.05) !important;
}

/* 左侧子主题 */
.aitopics-sub-topics-left {
    grid-column: 1;
    grid-row: 1 / 3;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* 底部子主题 */
.aitopics-sub-topics-bottom {
    grid-column: 2;
    grid-row: 2;
}

.aitopics-sub-topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

/* 重複したスタイル定義を削除 - 上記の書籍風スタイルを使用 */

/* 子主题区域 - L字形排列 */
.aitopics-sub-topics-left {
    grid-column: 1;
    grid-row: 1 / 3;
}

.aitopics-sub-topics-bottom {
    grid-column: 2;
    grid-row: 2;
    margin-top: 20px;
}

/* 子主题卡片 */
.aitopics-sub-topic-card {
    background: white;
    border-radius: 8px;
    padding: 0;
    margin-bottom: 20px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    border-bottom: 4px solid #ffc107;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
}

.aitopics-sub-topic-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
    text-decoration: none;
    color: inherit;
}

.aitopics-sub-topic-photo-container {
    position: relative;
    width: 100%;
    height: 180px;
    overflow: hidden;
    border-radius: 8px 8px 0 0;
}

.aitopics-sub-topics-bottom .aitopics-sub-topic-photo-container {
    height: 180px;
}

.aitopics-sub-topic-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.aitopics-sub-topic-title {
    position: absolute;
    top: 10px;
    right: 15px;
    left: 15px;
    font-size: 1.2em;
    font-weight: bold;
    color: white;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.7);
    margin: 0;
    z-index: 2;
    text-align: right;
    white-space: nowrap;
}

.aitopics-sub-topic-intro {
    color: #6c757d;
    font-size: 0.8em;
    line-height: 1.5;
    padding: 15px;
}

/* 子主题网格 */
.aitopics-sub-topics-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    max-width: 800px;
    width: 100%;
}

.aitopics-sub-topics-bottom .aitopics-sub-topic-card {
    max-width: 390px;
    width: 100%;
}

/* 照片模态框 */
.aitopics-photo-modal {
    display: none !important;
    position: fixed !important;
    z-index: 2147483647 !important;
    left: 0 !important;
    top: 0 !important;
    width: 100% !important;
    height: 100% !important;
    background-color: rgba(0,0,0,0.9) !important;
    cursor: pointer !important;
    pointer-events: auto !important;
}

.aitopics-photo-modal-content {
    position: fixed !important;
    top: 50% !important;
    left: 50% !important;
    transform: translate(-50%, -50%) !important;
    max-width: 90% !important;
    max-height: 90% !important;
    object-fit: contain !important;
    z-index: 2147483647 !important;
    pointer-events: auto !important;
}

.aitopics-photo-modal-close {
    position: fixed !important;
    top: 20px !important;
    right: 35px !important;
    color: #fff !important;
    font-size: 40px !important;
    font-weight: bold !important;
    cursor: pointer !important;
    z-index: 2147483647 !important;
    pointer-events: auto !important;
}

.aitopics-photo-modal-close:hover {
    opacity: 0.7;
}

/* 强制覆盖所有可能的高z-index元素 */
.aitopics-photo-modal.show {
    display: block !important;
    position: fixed !important;
    z-index: 2147483647 !important;
    left: 0 !important;
    top: 0 !important;
    width: 100vw !important;
    height: 100vh !important;
    background-color: rgba(0,0,0,0.9) !important;
    pointer-events: auto !important;
}

.aitopics-photo-modal.show .aitopics-photo-modal-content {
    position: fixed !important;
    top: 50% !important;
    left: 50% !important;
    transform: translate(-50%, -50%) !important;
    max-width: 90vw !important;
    max-height: 90vh !important;
    object-fit: contain !important;
    z-index: 2147483647 !important;
    pointer-events: auto !important;
}

.aitopics-photo-modal.show .aitopics-photo-modal-close {
    position: fixed !important;
    top: 20px !important;
    right: 35px !important;
    color: #fff !important;
    font-size: 40px !important;
    font-weight: bold !important;
    cursor: pointer !important;
    z-index: 2147483647 !important;
    pointer-events: auto !important;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .aitopics-layout {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
    }
    
    .aitopics-main-topic-area {
        grid-column: 1;
        grid-row: 1;
    }
    
    .aitopics-sub-topics-left {
        grid-column: 1;
        grid-row: 2;
    }
    
    .aitopics-sub-topics-bottom {
        grid-column: 1;
        grid-row: 3;
    }
}

@media (max-width: 768px) {
    .aitopics-container {
        padding: 10px;
    }
    
    .aitopics-main-topic-area {
        padding: 20px;
    }
    
    .aitopics-main-topic-title {
        width: 90%;
        font-size: 2em;
    }
    
    .aitopics-culture-photo-item {
        flex: 0 0 150px;
    }
    
    .aitopics-sub-topics-grid {
        grid-template-columns: 1fr;
    }
}