/* 章节标题样式 */
        .section-title {
            font-size: 2.5rem;
            font-weight: 700;
            color: #333;
            margin-bottom: 20px;
            position: relative;
            display: inline-block;
        }

        .section-title::after {
            content: "";
            position: absolute;
            bottom: -10px;
            left: 0;
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, #1877f2, #42a5f5);
            border-radius: 2px;
        }

        /* 筛选按钮样式 */
        .filter-buttons {
            text-align: center;
            margin-bottom: 50px;
        }

        .filter-btn {
            background: white;
            color: #666;
            border: 2px solid #e9ecef;
            padding: 10px 25px;
            margin: 5px;
            border-radius: 25px;
            font-weight: 500;
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .filter-btn:hover,
        .filter-btn.active {
            background: #1877f2;
            color: white;
            border-color: #1877f2;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(24, 119, 242, 0.3);
        }

        /* 案例卡片样式 */
        .case-card {
            background: white;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 5px 25px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
            margin-bottom: 30px;
            height: 100%;
        }

        .case-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
        }

        .case-card .case-image {
            position: relative;
            overflow: hidden;
            height: 250px;
        }

        .case-card .case-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.3s ease;
        }

        .case-card:hover .case-image img {
            transform: scale(1.05);
        }

        .case-card .case-category {
            position: absolute;
            top: 15px;
            left: 15px;
            background: rgba(24, 119, 242, 0.9);
            color: white;
            padding: 5px 15px;
            border-radius: 15px;
            font-size: 0.85rem;
            font-weight: 500;
        }

        .case-card .case-content {
            padding: 30px;
        }

        .case-card .case-title {
            color: #333;
            font-weight: 600;
            font-size: 1.3rem;
            margin-bottom: 15px;
            line-height: 1.4;
        }

        .case-card .case-description {
            color: #666;
            line-height: 1.6;
            margin-bottom: 20px;
        }

        .case-card .case-tags {
            margin-bottom: 20px;
        }

        .case-tag {
            display: inline-block;
            background: #f8f9fa;
            color: #666;
            padding: 4px 12px;
            border-radius: 12px;
            font-size: 0.8rem;
            margin: 2px;
            border: 1px solid #e9ecef;
        }

        .case-card .case-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 20px;
            border-top: 1px solid #f0f0f0;
        }

        .case-client {
            color: #1877f2;
            font-weight: 500;
            font-size: 0.9rem;
        }

        .case-date {
            color: #999;
            font-size: 0.85rem;
        }

        /* 统计数据样式 */
        .stats-section {
            background: linear-gradient(135deg, #1877f2 0%, #42a5f5 100%);
            color: white;
            padding: 80px 0;
            position: relative;
            overflow: hidden;
        }

        .stats-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 100" fill="rgba(255,255,255,0.1)"><polygon points="0,0 1000,0 1000,100 0,80"/></svg>') no-repeat bottom;
            background-size: cover;
        }

        .stats-item {
            text-align: center;
            padding: 20px;
            position: relative;
            z-index: 2;
        }

        .stats-item .stats-number {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 10px;
            display: block;
        }

        .stats-item .stats-label {
            font-size: 1.2rem;
            opacity: 0.9;
            font-weight: 500;
        }

        /* 客户评价样式 */
        .testimonial-card {
            background: white;
            border-radius: 15px;
            padding: 40px 30px;
            box-shadow: 0 5px 25px rgba(0, 0, 0, 0.1);
            margin-bottom: 30px;
            position: relative;
            text-align: center;
        }

        .testimonial-card::before {
            content: '\f10d';
            font-family: 'Font Awesome 5 Free';
            font-weight: 900;
            font-size: 3rem;
            color: #1877f2;
            opacity: 0.2;
            position: absolute;
            top: 20px;
            left: 30px;
        }

        .testimonial-content {
            font-style: italic;
            color: #666;
            font-size: 1.1rem;
            line-height: 1.6;
            margin-bottom: 25px;
            position: relative;
            z-index: 2;
        }

        .testimonial-author {
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .testimonial-author img {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            object-fit: cover;
            margin-right: 15px;
            border: 3px solid #1877f2;
        }

        .testimonial-author .author-info h6 {
            color: #333;
            font-weight: 600;
            margin-bottom: 5px;
        }

        .testimonial-author .author-info .author-position {
            color: #666;
            font-size: 0.9rem;
        }