* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        :root {
            --primary: #3a86ff;
            --primary-dark: #2667cc;
            --secondary: #8338ec;
            --accent: #ff006e;
            --light: #f8f9fa;
            --dark: #212529;
            --gray: #6c757d;
            --light-gray: #e9ecef;
            --success: #38b000;
            --warning: #ff9e00;
            --border-radius: 10px;
            --box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        
        body {
            color: var(--dark);
            line-height: 1.6;
            background-color: #f8fafc;
        }
        .nav-links {
                width: 60%!important; 
        }        
        section {
            padding: 0px 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 60px;
        }
        
        .section-title h2 {
            font-size: 2rem;
            color: var(--dark);
            margin-bottom: 15px;
        }
        
        .section-title p {
            font-size: 0.9rem;
            color: var(--gray);
            max-width: 700px;
            margin: 0 auto;
        }
        
        /* 导航栏 */
        header {
            background-color: white;
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.05);
            position: sticky;
            top: 0;
            width: 100%;
            z-index: 1000;
        }
        
        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0px 0;
        }
        
        .logo {
            display: flex;
            align-items: center;
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary);
            text-decoration: none;
        }
        
        .logo i {
            margin-right: 10px;
            color: var(--secondary);
        }
        
        .nav-links {
            display: flex;
            list-style: none;
        }
        
        .nav-links li {
            margin-left: 30px;
        }
        
        .nav-links a {
            text-decoration: none;
            color: var(--dark);
            font-weight: 500;
            transition: var(--transition);
            padding: 5px 0;
            position: relative;
        }
        
        .nav-links a:hover {
            color: var(--primary);
        }
        
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--primary);
            transition: var(--transition);
        }
        
        .nav-links a:hover::after {
            width: 100%;
        }
        
        .nav-links a.active {
            color: var(--primary);
        }
        
        .nav-links a.active::after {
            width: 100%;
        }
        
        .nav-buttons {
            display: flex;
            align-items: center;
        }
        
        .nav-buttons .btn {
            margin-left: 15px;
        }
        
        /* 按钮样式 */
        .btn {
            display: inline-block;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            text-decoration: none;
            cursor: pointer;
            transition: var(--transition);
            border: none;
            font-size: 1rem;
        }
        
        .btn-primary {
            background-color: var(--primary);
            color: white;
        }
        
        .btn-primary:hover {
            background-color: var(--primary-dark);
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(58, 134, 255, 0.2);
        }
        
        .btn-secondary {
            background-color: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        
        .btn-secondary:hover {
            background-color: rgba(58, 134, 255, 0.05);
            transform: translateY(-3px);
        }
        
        .btn-accent {
            background-color: var(--accent);
            color: white;
        }
        
        .btn-accent:hover {
            background-color: #e0005e;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(255, 0, 110, 0.2);
        }
        
        /* 英雄区域 */
        .help-hero {
            padding-top: 120px;
            padding-bottom: 60px;
            background: linear-gradient(135deg, #f5f7ff 0%, #f0f4ff 100%);
            text-align: center;
        }
        
        .help-hero h1 {
            font-size: 3rem;
            margin-bottom: 20px;
            color: var(--dark);
        }
        
        .help-hero p {
            font-size: 1.25rem;
            color: var(--gray);
            max-width: 700px;
            margin: 0 auto 40px;
        }
        
               
        /* 热门问题 */
        .popular-questions {
            background-color: white;
        }
        
        .questions-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
            margin-bottom: 40px;
        }
        
        .question-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 25px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: var(--transition);
            border-left: 4px solid var(--primary);
            cursor: pointer;
        }
        
        .question-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        
        .question-card h3 {
            font-size: 1.2rem;
            margin-bottom: 10px;
            color: var(--dark);
            display: flex;
            align-items: center;
        }
        
        .question-card h3 i {
            margin-right: 10px;
            color: var(--primary);
        }
        
        .question-card p {
            color: var(--gray);
            font-size: 0.95rem;
            line-height: 1.5;
        }
        
        /* 分类导航 */
        .help-categories {
            background-color: var(--light);
        }
        
        .categories-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
        }
        
        .category-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 30px;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            text-align: center;
            cursor: pointer;
        }
        
        .category-card:hover {
            transform: translateY(-10px);
        }
        
        .category-icon {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            background: linear-gradient(135deg, rgba(58, 134, 255, 0.1) 0%, rgba(131, 56, 236, 0.1) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 1.8rem;
            color: var(--primary);
        }
        
        .category-card h3 {
            font-size: 1.4rem;
            margin-bottom: 15px;
            color: var(--dark);
        }
        
        .category-card p {
            color: var(--gray);
            margin-bottom: 20px;
            font-size: 0.95rem;
        }
        
        .category-link {
            color: var(--primary);
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            text-decoration: none;
        }
        
        .category-link i {
            margin-left: 8px;
            transition: var(--transition);
        }
        
        .category-card:hover .category-link i {
            transform: translateX(5px);
        }
        
        /* 常见问题区域 */
        .faq-section {
            background-color: white;
        }
        
        .faq-container {
            max-width: 900px;
            margin: 0 auto;
        }
        
        .faq-item {
            margin-bottom: 20px;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
            border: 1px solid var(--light-gray);
        }
        
        .faq-question {
            padding: 20px 25px;
            background: white;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition);
        }
        
        .faq-question:hover {
            background-color: rgba(58, 134, 255, 0.02);
        }
        
        .faq-question h3 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--dark);
        }
        
        .faq-toggle {
            color: var(--primary);
            font-size: 1.2rem;
            transition: var(--transition);
        }
        
        .faq-answer {
            padding: 0 25px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            background-color: white;
        }
        
        .faq-answer.active {
            padding: 0 25px 25px;
            max-height: 500px;
        }
        
        .faq-answer p {
            color: var(--gray);
            line-height: 1.7;
            font-size: 0.9rem;
        }
        
        .faq-answer ul, .faq-answer ol {
            margin: 15px 0 15px 20px;
            color: var(--gray);
            font-size: 0.9rem;
        }
        
        .faq-answer li {
            margin-bottom: 8px;
        }
        
        /* 联系支持区域 */
        .contact-support {
            background-color: var(--light);
        }
        
        .contact-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 40px;
        }
        
        .contact-methods {
            display: flex;
            flex-direction: column;
            gap: 25px;
        }
        
        .contact-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 25px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            display: flex;
            align-items: flex-start;
            gap: 20px;
            transition: var(--transition);
        }
        
        .contact-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        
        .contact-icon {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: linear-gradient(135deg, rgba(58, 134, 255, 0.1) 0%, rgba(131, 56, 236, 0.1) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--primary);
            flex-shrink: 0;
        }
        
        .contact-info h3 {
            font-size: 1.2rem;
            margin-bottom: 5px;
            color: var(--dark);
        }
        
        .contact-info p {
            color: var(--gray);
            font-size: 0.95rem;
            margin-bottom: 8px;
        }
        
        .contact-link {
            color: var(--primary);
            font-weight: 600;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
        }
        
        .contact-link i {
            margin-left: 5px;
            font-size: 0.9rem;
        }
        
        .contact-form-container {
            background: white;
            border-radius: var(--border-radius);
            padding: 30px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        
        .contact-form-container h3 {
            font-size: 1.4rem;
            margin-bottom: 20px;
            color: var(--dark);
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            color: var(--dark);
        }
        
        .form-control {
            width: 100%;
            padding: 12px 15px;
            border-radius: 8px;
            border: 1px solid var(--light-gray);
            font-size: 1rem;
            transition: var(--transition);
        }
        
        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(58, 134, 255, 0.1);
        }
        
        textarea.form-control {
            min-height: 150px;
            resize: vertical;
        }
        
        
        
        /* 页脚 */
        footer {
            background-color: var(--dark);
            color: white;
            padding: 60px 0 30px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        
        .footer-column h4 {
            font-size: 1.2rem;
            margin-bottom: 20px;
            color: white;
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 10px;
        }
        
        .footer-links a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: var(--transition);
        }
        
        .footer-links a:hover {
            color: white;
        }
        
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.5);
            font-size: 0.9rem;
        }
         /* 操作手册主布局 */
        .manual-container {
            display: flex;
            min-height: calc(100vh - 80px);
            padding-top: 20px;
            padding-bottom: 40px;
        }
        /* 左侧菜单 */
        .manual-sidebar {
            width: 280px;
            background-color: white;
            border-radius: var(--border-radius);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            padding: 25px 0;
            position: sticky;
            top: 100px;
            height: calc(100vh - 120px);
            overflow-y: auto;
            flex-shrink: 0;
        }
        
        .sidebar-header {
            padding: 0 25px 20px;
            border-bottom: 1px solid var(--light-gray);
            margin-bottom: 15px;
        }
        
        .sidebar-header h2 {
            font-size: 1.4rem;
            color: var(--dark);
            display: flex;
            align-items: center;
        }
        
        .sidebar-header h2 i {
            margin-right: 10px;
            color: var(--primary);
        }
        
        .sidebar-search {
            padding: 0 25px 20px;
            position: relative;
        }
        
        .sidebar-search input {
            width: 100%;
            padding: 10px 15px 10px 40px;
            border-radius: 8px;
            border: 1px solid var(--light-gray);
            font-size: 0.95rem;
            transition: var(--transition);
        }
        
        .sidebar-search input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(58, 134, 255, 0.1);
        }
        
        .sidebar-search i {
            position: absolute;
            left: 35px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--gray);
        }
        
        .sidebar-menu {
            padding: 0 15px;
        }
        
        .menu-category {
            margin-bottom: 15px;
        }
        
        .menu-category-title {
            padding: 10px 10px;
            font-weight: 600;
            color: var(--dark);
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            cursor: pointer;
            border-radius: 6px;
            transition: var(--transition);
        }
        
        .menu-category-title:hover {
            background-color: rgba(58, 134, 255, 0.05);
            color: var(--primary);
        }
        
        .menu-category-title i {
            margin-right: 10px;
            font-size: 0.9rem;
            color: var(--gray);
            transition: var(--transition);
        }
        
        .menu-category-title:hover i {
            color: var(--primary);
        }
        
        .menu-category-title .toggle-icon {
            margin-left: auto;
            font-size: 0.8rem;
            transition: var(--transition);
        }
        
        .menu-category-title.active .toggle-icon {
            transform: rotate(90deg);
        }
        
        .menu-items {
            padding-left: 30px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }
        
        .menu-category.active .menu-items {
            max-height: 1000px;
        }
        
        .menu-item {
            margin-bottom: 5px;
        }
        
        .menu-item a {
            display: block;
            padding: 10px 15px;
            text-decoration: none;
            color: var(--gray);
            font-size: 0.9rem;
            border-radius: 6px;
            transition: var(--transition);
            position: relative;
        }
        
        .menu-item a:hover {
            background-color: rgba(58, 134, 255, 0.05);
            color: var(--primary);
        }
        
        .menu-item a.active {
            background-color: rgba(58, 134, 255, 0.1);
            color: var(--primary);
            font-weight: 500;
        }
        
        .menu-item a.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 3px;
            background-color: var(--primary);
            border-radius: 0 3px 3px 0;
        }
        /* 右侧内容区域 */
        .content-header h2 i {
            margin-right: 10px;
            color: var(--primary);
        }
        .manual-content {
            flex: 1;
            margin-left: 30px;
            background-color: white;
            border-radius: var(--border-radius);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }
        
        .content-header {
            padding: 25px 30px;
            border-bottom: 1px solid var(--light-gray);
            background-color: #fdfdfd;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 15px;
        }
        
        .content-header h1 {
            font-size: 1.8rem;
            color: var(--dark);
            display: flex;
            align-items: center;
        }
        
        .content-header h1 i {
            margin-right: 12px;
            color: var(--primary);
        }
        
        .content-actions {
            display: flex;
            gap: 10px;
        }
        
        .content-actions .btn {
            padding: 8px 16px;
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .content-body {
            flex: 1;
            padding: 0;
            overflow: hidden;
        }
        /* 文档容器 */
        .document-container {
            width: 100%;
            height: 100%;
            position: relative;
        }
        
        .document-frame {
            width: 100%;
            height: 100%;
            border: none;
            display: block;
        }
        
        .document-placeholder {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            height: 100%;
            padding: 40px;
            text-align: center;
            color: var(--gray);
        }
        
        .document-placeholder i {
            font-size: 1rem;
            color: var(--light-gray);
            margin-bottom: 20px;
        }
        
        .document-placeholder h3 {
            font-size: 1.5rem;
            color: var(--dark);
            margin-bottom: 10px;
        }
        
        .document-placeholder p {
            max-width: 500px;
            margin-bottom: 30px;
        }
        /* 响应式设计 */
        @media (max-width: 992px) {
            .help-hero h1 {
                font-size: 2.5rem;
            }
            .manual-container {
                flex-direction: column;
            }
            
            .manual-sidebar {
                width: 100%;
                position: relative;
                top: 0;
                height: auto;
                max-height: 400px;
                margin-bottom: 30px;
                overflow-y: auto;
            }
            
            .manual-content {
                margin-left: 0;
            }
        }
        
        @media (max-width: 768px) {
            
            .help-hero h1 {
                font-size: 2.2rem;
            }
            
            .help-hero p {
                font-size: 1.1rem;
            }
            
            .search-box {
                padding: 15px 20px;
                padding-right: 60px;
                font-size: 1rem;
            }
            
            .categories-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            
            .contact-grid {
                grid-template-columns: 1fr;
            }
            
            .back-to-top {
                bottom: 20px;
                right: 20px;
                width: 45px;
                height: 45px;
            }
        }
        
        @media (max-width: 576px) {
            .help-hero {
                padding-top: 100px;
                padding-bottom: 40px;
            }
            
            .help-hero h1 {
                font-size: 1.8rem;
            }
            
         
            .faq-question {
                padding: 15px 20px;
            }
            
            .faq-answer.active {
                padding: 0 20px 20px;
            }
        }
        .faq-title {
            color:#000;
            font-size: 18px;
            padding:10px 0px 10px 0px;
            font-weight: bold;
            font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
        }