    <style>
        /* 基础样式 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "SimSun", "宋体", "Noto Serif SC", serif;
        }
        
        body {
            background: linear-gradient(135deg, #f5f5f5 0%, #e8e8e8 100%);
            color: #424242;
            min-height: 100vh;
            overflow-x: hidden;
        }
        
        /* 布局 */
        .container {
            display: flex;
            min-height: 100vh;
            max-width: 1400px;
            margin: 0 auto;
            box-shadow: 0 0 30px rgba(0, 0, 0, 0.05);
        }
        
        /* 左侧导航 */
        .sidebar {
            width: 400px;
            background: rgba(250, 250, 250, 0.95);
            padding: 25px 20px;
            overflow-y: auto;
            z-index: 10;
            position: relative;
            border-right: 1px solid rgba(200, 200, 200, 0.5);
        }
        
        .logo {
            text-align: center;
            padding: 20px 0;
            margin-bottom: 30px;
            border-bottom: 1px solid rgba(200, 200, 200, 0.5);
        }
        
        .logo h1 {
            color: #616161;
            font-size: 28px;
            letter-spacing: 8px;
            font-weight: normal;
        }
        
        .logo p {
            color: #9e9e9e;
            font-size: 14px;
            margin-top: 10px;
            letter-spacing: 2px;
        }
        
        /* 树状导航 */
        .tree-nav {
            margin-top: 20px;
        }
        
        .tree-item {
            margin-bottom: 15px;
        }
        
        .tree-title {
            color: #616161;
            font-weight: bold;
            padding: 12px 15px;
            cursor: pointer;
            border-left: 3px solid #bdbdbd;
            background: rgba(224, 224, 224, 0.3);
            transition: all 0.3s;
            border-radius: 0 5px 5px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
	    text-decoration: none !important;
        }
        
        .tree-title:hover {
            background: rgba(224, 224, 224, 0.5);
            padding-left: 20px;
        }
        
        .tree-title i {
            font-size: 14px;
            transition: transform 0.3s;
            color: #9e9e9e;
        }
        
        .tree-title.active i {
            transform: rotate(90deg);
        }
        
        .tree-children {
            margin-left: 25px;
            margin-top: 8px;
            display: none;
        }
        
        .tree-children.active {
            display: block;
        }
        
        .tree-child {
	    text-decoration: none !important;
  	    color: inherit;
  	    display: block;
            padding: 10px 15px;
            color: #757575;
            cursor: pointer;
            border-bottom: 1px solid rgba(200, 200, 200, 0.3);
            transition: all 0.2s;
            border-radius: 3px;
            align-items: center;
        }
        
        .tree-child:hover, .tree-child.active {
            color: #424242;
            background-color: rgba(224, 224, 224, 0.3);
        }
        
        .tree-child i {
            margin-right: 10px;
            font-size: 12px;
            color: #9e9e9e;
        }
        
        /* 右侧内容区 */
        .content {
            flex: 1;
            padding: 40px;
            position: relative;
            overflow-y: auto;
        }
        
        /* 背景装饰 */
        .bg-pattern {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: 
                radial-gradient(circle at 20% 30%, rgba(189, 189, 189, 0.05) 0%, transparent 50%),
                radial-gradient(circle at 80% 70%, rgba(189, 189, 189, 0.05) 0%, transparent 50%);
            z-index: 0;
        }
        
        /* 内容卡片 */
        .ruism-card {
            background: rgba(255, 255, 255, 0.95);
            border: 1px solid rgba(200, 200, 200, 0.5);
            padding: 40px;
            margin-bottom: 30px;
            position: relative;
            z-index: 1;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
            border-radius: 8px;
        }
        
        .ruism-header {
            text-align: center;
            margin-bottom: 40px;
            position: relative;
        }
        
        .ruism-title {
            font-size: 32px;
            color: #424242;
            letter-spacing: 5px;
            margin-bottom: 15px;
            font-weight: normal;
        }
        
        .ruism-subtitle {
            font-size: 18px;
            color: #757575;
            letter-spacing: 5px;
        }
        
        .ruism-header::after {
            content: "";
            position: absolute;
            bottom: -20px;
            left: 25%;
            width: 50%;
            height: 1px;
            background: linear-gradient(to right, transparent, #bdbdbd, transparent);
        }
        
        /* 文章内容样式 */
        .article-content {
            line-height: 1.8;
            color: #424242;
            font-size: 18px;
        }
        
        .article-content h2 {
            color: #616161;
            margin: 40px 0 20px;
            padding-bottom: 10px;
            border-bottom: 1px solid rgba(189, 189, 189, 0.3);
            letter-spacing: 3px;
            font-weight: normal;
        }
        
        .article-content h3 {
            color: #757575;
            margin: 30px 0 15px;
            padding-left: 15px;
            border-left: 3px solid #bdbdbd;
            letter-spacing: 2px;
            font-weight: normal;
        }
        
        .article-content p {
            margin-bottom: 20px;
            text-indent: 2em;
        }
        
        .article-content ul, .article-content ol {
            margin: 15px 0;
            padding-left: 40px;
        }
        
        .article-content li {
            margin-bottom: 10px;
        }

        .article-link {
	    display: block;
	    color: #5c4b37;
	    text-decoration: none;
	    transition: all 0.2s;
	    position: relative;
	    padding-left: 1.5rem;
	}

        /* 数学公式样式 */
        .math-formula {
            background: rgba(245, 245, 245, 0.8);
            padding: 20px;
            margin: 20px 0;
            border-radius: 5px;
            border-left: 4px solid #9e9e9e;
            font-family: "Cambria Math", "Times New Roman", serif;
            text-align: center;
            font-size: 18px;
            color: #616161;
        }
        
        /* 表格样式 */
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
        }
        
        th, td {
            padding: 12px 15px;
            text-align: left;
            border: 1px solid rgba(189, 189, 189, 0.3);
        }
        
        th {
            background-color: rgba(245, 245, 245, 0.8);
            color: #616161;
            font-weight: normal;
            letter-spacing: 1px;
        }
        
        tr:nth-child(even) {
            background-color: rgba(250, 250, 250, 0.5);
        }
        
        /* 定义框样式 */
        .definition-box {
            background: rgba(245, 245, 245, 0.8);
            padding: 20px;
            margin: 20px 0;
            border-radius: 5px;
            border-left: 4px solid #bdbdbd;
        }
        
        .definition-title {
            color: #616161;
            font-weight: bold;
            margin-bottom: 10px;
            letter-spacing: 1px;
        }
        
        /* 案例研究样式 */
        .case-study {
            background: rgba(250, 250, 250, 0.8);
            padding: 25px;
            margin: 25px 0;
            border-radius: 5px;
            border: 1px solid rgba(189, 189, 189, 0.3);
        }
        
        .case-title {
            color: #616161;
            font-weight: bold;
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 1px solid rgba(189, 189, 189, 0.3);
            letter-spacing: 1px;
        }
        
        /* 高亮样式 */
        .highlight {
            background: rgba(255, 253, 231, 0.8);
            padding: 25px;
            margin: 25px 0;
            border-radius: 5px;
            border-left: 4px solid #ffd54f;
        }
        
        /* 推论样式 */
        .corollary {
            background: rgba(232, 245, 233, 0.8);
            padding: 25px;
            margin: 25px 0;
            border-radius: 5px;
            border-left: 4px solid #66bb6a;
        }
        
        /* 导航按钮样式 */
        .nav-buttons {
            display: flex;
            justify-content: space-between;
            margin: 30px 0;
        }
        
        .nav-button {
            padding: 12px 25px;
            background: rgba(255, 255, 255, 0.9);
            border: 1px solid rgba(189, 189, 189, 0.5);
            border-radius: 5px;
            color: #616161;
            text-decoration: none;
            transition: all 0.3s;
            letter-spacing: 1px;
        }
        
        .nav-button:hover {
            background: rgba(224, 224, 224, 0.3);
            border-color: #9e9e9e;
        }
        
        /* 面包屑导航 */
        .breadcrumb {
            color: #757575;
            margin-bottom: 30px;
            font-size: 16px;
        }
        
        .breadcrumb a {
            color: #616161;
            text-decoration: none;
        }
        
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        
        /* 文章元数据 */
        .article-meta {
            color: #9e9e9e;
            font-size: 16px;
            margin-bottom: 30px;
            text-align: center;
        }
        
        /* 装饰元素 */
        .decoration {
            position: absolute;
            width: 120px;
            height: 120px;
            background-size: contain;
            background-repeat: no-repeat;
            opacity: 0.1;
            z-index: 0;
        }
        
        .decoration-1 {
            top: 10%;
            left: 5%;
            background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><path fill="%23616161" d="M50,10 C60,10 70,15 75,25 C80,35 80,45 75,55 C70,65 60,70 50,70 C40,70 30,65 25,55 C20,45 20,35 25,25 C30,15 40,10 50,10 Z M50,30 C45,30 40,35 40,40 C40,45 45,50 50,50 C55,50 60,45 60,40 C60,35 55,30 50,30 Z"/></svg>');
        }
        
        .decoration-2 {
            bottom: 10%;
            right: 5%;
            background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><path fill="%239e9e9e" d="M10,50 C10,40 15,30 25,25 C35,20 45,20 55,25 C65,30 70,40 70,50 C70,60 65,70 55,75 C45,80 35,80 25,75 C15,70 10,60 10,50 Z M30,50 C30,45 35,40 40,40 C45,40 50,45 50,50 C50,55 45,60 40,60 C35,60 30,55 30,50 Z"/></svg>');
        }
        
        /* 响应式调整 */
        @media (max-width: 1024px) {
            .container {
                flex-direction: column;
            }
            
            .sidebar {
                width: 100%;
                border-right: none;
                border-bottom: 1px solid rgba(200, 200, 200, 0.5);
            }
            
            .content {
                padding: 25px;
            }
            
            .ruism-card {
                padding: 25px;
            }
        }
        
        @media (max-width: 768px) {
            .ruism-title {
                font-size: 26px;
            }
            
            .article-content {
                font-size: 16px;
            }
            
            table {
                font-size: 14px;
            }
            
            th, td {
                padding: 8px 10px;
            }
        }
        
        /* 滚动条样式 */
        ::-webkit-scrollbar {
            width: 8px;
        }
        
        ::-webkit-scrollbar-track {
            background: rgba(245, 245, 245, 0.5);
        }
        
        ::-webkit-scrollbar-thumb {
            background: rgba(189, 189, 189, 0.5);
            border-radius: 4px;
        }
        
        ::-webkit-scrollbar-thumb:hover {
            background: rgba(189, 189, 189, 0.7);
        }
        .classic-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        
        .classic-card {
            background: #f9f7f2;
            border-radius: 5px;
            padding: 1.5rem;
            border-left: 4px solid #8b7355;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        
        .classic-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        
        .classic-title {
            font-size: 1.2rem;
            color: #616161;
            margin-bottom: 0.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .classic-number {
            background: #8b7355;
            color: white;
            width: 30px;
            height: 30px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.9rem;
        }
        
        .classic-description {
            color: #7a6852;
            line-height: 1.6;
            margin-bottom: 1rem;
        }
        
        .classic-link {
            display: inline-block;
            background: #8b7355;
            color: white;
            padding: 0.5rem 1rem;
            border-radius: 3px;
            text-decoration: none;
            font-size: 0.9rem;
            transition: background 0.3s ease;
        }
        
        .classic-link:hover {
            background: #7a6852;
        }
                
        @media (max-width: 768px) {
            .classic-grid {
                grid-template-columns: 1fr;
            }
        }
        .faq-container {
            max-width: 800px;
            margin: 0 auto;
            padding: 2rem 0;
        }
        
        .faq-card {
            background: #f9f7f2;
            border-radius: 5px;
            padding: 2rem;
            border-left: 4px solid #8b7355;
            text-align: center;
            margin-bottom: 2rem;
        }
        
        .faq-icon {
            font-size: 3rem;
            color: #8b7355;
            margin-bottom: 1rem;
        }
        
        .faq-title {
            font-size: 1.5rem;
            color: #616161;
            margin-bottom: 1rem;
        }
        
        .faq-content {
            color: #7a6852;
            line-height: 1.6;
            margin-bottom: 1.5rem;
        }
        
        .faq-link {
            display: inline-block;
            background: #8b7355;
            color: white;
            padding: 0.8rem 1.5rem;
            border-radius: 3px;
            text-decoration: none;
            font-size: 1rem;
            transition: background 0.3s ease;
            margin-top: 1rem;
        }
        
        .faq-link:hover {
            background: #7a6852;
        }
        
        .faq-note {
            background: #e8dfca;
            padding: 1rem;
            border-radius: 3px;
            color: #7a6852;
            font-size: 0.9rem;
            margin-top: 2rem;
        }

        /* 结果区域样式 */
        .result-section {
            background: #f9f7f1;
            border-radius: 5px;
            margin: 20px 0;
            overflow: hidden;
            border: 1px solid #e0d6c2;
        }
        
        .result-header {
            background: #8B4513;
            color: #f5f2e9;
            padding: 10px 15px;
            font-weight: bold;
        }
        
        .result-placeholder, .result-image {
            padding: 30px;
            text-align: center;
            color: #666;
        }
        
        .result-placeholder i {
            font-size: 48px;
            color: #d4c9b1;
            margin-bottom: 15px;
        }
        
        /* 图片自适应样式 */
        .result-image img {
            max-width: 100%;
            height: auto;
            border-radius: 5px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.1);
            display: block;
            margin: 0 auto;
        }
        
        .image-caption {
            margin-top: 15px;
            font-style: italic;
            color: #666;
            text-align: center;
        }
    </style>
