/* 帮助中心头部 */
        .help-header {
            background: var(--gradient-primary);
            color: white;
            padding: 80px 0 60px;
            text-align: center;
            margin-bottom: 50px;
            position: relative;
            overflow: hidden;
        }
        
        .help-header::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -50%;
            width: 800px;
            height: 800px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
        }
        
        .help-header h1 {
            font-size: 2.8rem;
            margin-bottom: 20px;
            position: relative;
            z-index: 1;
        }
        
        .help-header p {
            font-size: 1.2rem;
            max-width: 700px;
            margin: 0 auto 30px;
            opacity: 0.9;
            position: relative;
            z-index: 1;
        }
        
        .search-container {
            max-width: 700px;
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }
        
        .search-box {
            display: flex;
            background: white;
            border-radius: 50px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.15);
        }
        
        .search-box input {
            flex: 1;
            padding: 18px 25px;
            border: none;
            font-size: 1.1rem;
            outline: none;
        }
        
        .search-box button {
            background: var(--accent);
            color: white;
            border: none;
            padding: 0 35px;
            font-size: 1.1rem;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .search-box button:hover {
            background: #3db5d8;
        }
        
        .popular-searches {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-top: 25px;
            flex-wrap: wrap;
        }
        
        .search-tag {
            background: rgba(255,255,255,0.15);
            color: white;
            padding: 8px 18px;
            border-radius: 30px;
            font-size: 0.9rem;
            transition: var(--transition);
            cursor: pointer;
        }
        
        .search-tag:hover {
            background: rgba(255,255,255,0.25);
            transform: translateY(-2px);
        }
        
        /* 帮助中心内容 */
        .help-content {
            display: grid;
            grid-template-columns: 280px 1fr;
            gap: 30px;
            margin-bottom: 50px;
        }
        
        /* 侧边导航 */
        .help-sidebar {
            background: white;
            border-radius: 16px;
            box-shadow: var(--card-shadow);
            padding: 25px;
            position: sticky;
            top: 120px;
            height: fit-content;
        }
        
        .help-sidebar h3 {
            font-size: 1.3rem;
            margin-bottom: 20px;
            padding-bottom: 15px;
            border-bottom: 1px solid var(--light-gray);
        }
        
        .help-categories {
            list-style: none;
        }
        
        .help-categories li {
            margin-bottom: 5px;
        }
        
        .help-categories a {
            display: block;
            padding: 12px 15px;
            text-decoration: none;
            color: var(--gray);
            border-radius: 8px;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .help-categories a:hover, .help-categories a.active {
            background: rgba(67, 97, 238, 0.05);
            color: var(--primary);
        }
        
        .help-categories a i {
            width: 25px;
            font-size: 1.1rem;
        }
        
        .contact-support {
            background: rgba(67, 97, 238, 0.05);
            border-radius: 12px;
            padding: 20px;
            margin-top: 30px;
            text-align: center;
        }
        
        .contact-support h4 {
            margin-bottom: 15px;
            color: var(--dark);
        }
        
        /* 主内容区域 */
        .help-main {
            min-width: 0;
        }
        
        .section-title {
            font-size: 1.6rem;
            margin-bottom: 25px;
            color: var(--dark);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        /* 常见问题分类 */
        .categories-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 25px;
            margin-bottom: 50px;
        }
        
        .category-card {
            background: white;
            border-radius: 16px;
            box-shadow: var(--card-shadow);
            padding: 30px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        
        .category-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        
        .category-icon {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            color: white;
            margin-bottom: 20px;
            background: var(--gradient-accent);
        }
        
        .category-title {
            font-size: 1.3rem;
            margin-bottom: 15px;
            color: var(--dark);
        }
        
        .faq-list {
            list-style: none;
            margin-top: 15px;
        }
        
        .faq-list li {
            margin-bottom: 12px;
            padding-bottom: 12px;
            border-bottom: 1px dashed var(--light-gray);
        }
        
        .faq-list a {
            text-decoration: none;
            color: var(--gray);
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .faq-list a:hover {
            color: var(--primary);
        }
        
        .faq-list a i {
            color: var(--accent);
            font-size: 0.9rem;
        }
        
        .view-all {
            display: inline-block;
            margin-top: 15px;
            color: var(--primary);
            font-weight: 500;
            text-decoration: none;
            transition: var(--transition);
        }
        
        .view-all:hover {
            text-decoration: underline;
        }
        
        /* 热门问题 */
        .popular-questions {
            background: white;
            border-radius: 16px;
            box-shadow: var(--card-shadow);
            padding: 30px;
            margin-bottom: 50px;
        }
        
        .questions-list {
            list-style: none;
        }
        
        .question-item {
            border-bottom: 1px solid var(--light-gray);
            padding: 20px 0;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .question-item:last-child {
            border-bottom: none;
        }
        
        .question-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .question-title {
            font-weight: 600;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .question-title i {
            color: var(--accent);
            transition: transform 0.3s ease;
        }
        
        .question-item.active .question-title i {
            transform: rotate(180deg);
        }
        
        .question-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            color: var(--gray);
            line-height: 1.7;
            padding: 0 30px;
        }
        
        .question-item.active .question-content {
            max-height: 1000px;
            padding: 15px 30px 5px;
        }
        
        /* 联系支持 */
        .contact-section {
            background: white;
            border-radius: 16px;
            box-shadow: var(--card-shadow);
            padding: 40px;
            margin-bottom: 50px;
        }
        
        .contact-cards {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 25px;
            margin-top: 30px;
        }
        
        .contact-card {
            background: rgba(67, 97, 238, 0.05);
            border-radius: 16px;
            padding: 30px;
            text-align: center;
            transition: var(--transition);
            border: 2px solid transparent;
        }
        
        .contact-card:hover {
            transform: translateY(-5px);
            border-color: var(--accent);
        }
        
        .contact-icon {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            color: white;
            margin: 0 auto 20px;
            background: var(--gradient-accent);
        }
        
        .contact-card h4 {
            margin-bottom: 15px;
            color: var(--dark);
        }
        
        .contact-card p {
            color: var(--gray);
            margin-bottom: 20px;
        }
          /* 分类列表页 */
        .category-header {
            background: var(--gradient-primary);
            color: white;
            padding: 60px 0;
            text-align: center;
            margin-bottom: 40px;
            position: relative;
        }
        
        .category-header h1 {
            font-size: 2.5rem;
            position: relative;
            z-index: 1;
        }
        
        .breadcrumb {
            display: flex;
            justify-content: center;
            list-style: none;
            margin-top: 15px;
        }
        
        .breadcrumb li {
            margin: 0 5px;
            position: relative;
        }
        
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin-left: 10px;
            color: rgba(255,255,255,0.7);
        }
        
        .breadcrumb a {
            color: rgba(255,255,255,0.9);
            text-decoration: none;
            transition: var(--transition);
        }
        
        .breadcrumb a:hover {
            color: var(--accent);
        }
            /* 响应式设计 */
        @media (max-width: 991px) {
            .help-content {
                grid-template-columns: 220px 1fr;
            }
        }
        
        @media (max-width: 768px) {
            .mobile-menu-btn {
                display: block;
            }
            
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: var(--primary);
                flex-direction: column;
                padding: 20px;
                box-shadow: 0 10px 15px rgba(0,0,0,0.1);
                z-index: 100;
            }
            
            .nav-links.active {
                display: flex;
            }
            
            .nav-links li {
                margin: 10px 0;
                width: 100%;
                margin-left: 0;
            }
            
            .nav-links a {
                display: block;
                padding: 12px 0;
                text-align: center;
                width: 100%;
            }
            
            .help-content {
                grid-template-columns: 1fr;
            }
            
            .help-sidebar {
                position: static;
                margin-bottom: 30px;
            }
            
            .nav-buttons {
                display: none;
            }
            
            .popular-searches {
                display: none;
            }
            
            .form-row {
                grid-template-columns: 1fr;
            }
        }
        
        @media (max-width: 576px) {
            .help-header h1 {
                font-size: 2.2rem;
            }
            
            .search-box button {
                padding: 0 25px;
            }
            
            .categories-grid {
                grid-template-columns: 1fr;
            }
            
            .contact-cards {
                grid-template-columns: 1fr;
            }
        }