* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Arial', sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f9f9f9;
        }
        
        .case-study-container {
            max-width: 1200px;
            margin: 0 auto;
            background: white;
            box-shadow: 0 0 20px rgba(0,0,0,0.1);
            border-radius: 10px;
            overflow: hidden;
        }
        
        .case-header {
            background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
            color: white;
            padding: 60px 40px;
            text-align: center;
        }
        
        .case-header h1 {
            font-size: 2.5em;
            margin-bottom: 15px;
        }
        
        .case-header .subtitle {
            font-size: 1.3em;
            opacity: 0.9;
            max-width: 700px;
            margin: 0 auto;
        }
        
        .case-meta {
            display: flex;
            justify-content: space-around;
            background: #f8f9fa;
            padding: 20px;
            flex-wrap: wrap;
        }
        
        .meta-item {
            margin: 10px;
            text-align: center;
        }
        
        .meta-item strong {
            display: block;
            color: #2c3e50;
            margin-bottom: 5px;
        }
        
        .content-section {
            padding: 40px;
            margin-bottom: 20px;
        }
        
        .content-section h2 {
            color: #2c3e50;
            border-left: 4px solid #3498db;
            padding-left: 15px;
            margin-bottom: 25px;
        }
        
        .client-profile {
            display: flex;
            align-items: center;
            background: #f8f9fa;
            padding: 25px;
            border-radius: 10px;
            margin-bottom: 30px;
        }
        
        .client-avatar {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: #3498db;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 2em;
            margin-right: 20px;
            flex-shrink: 0;
        }
        
        .client-details h3 {
            margin-bottom: 5px;
            color: #2c3e50;
        }
        
        .client-details p {
            color: #7f8c8d;
        }
        
        .image-gallery {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }
        
        .gallery-item {
            position: relative;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
        
        .gallery-item img,
        .gallery-item iframe {
            width: 100%;
            height: 250px;
            object-fit: cover;
            display: block;
            transition: transform 0.3s;
            border: none;
        }
        
        .gallery-item:hover img {
            transform: scale(1.05);
        }
        
        .image-caption {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: rgba(0,0,0,0.7);
            color: white;
            padding: 10px;
            font-size: 0.9em;
        }
        
        .video-container {
            margin: 30px 0;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
        
        .video-container iframe {
            width: 100%;
            height: 500px;
            border: none;
        }
        
        .testimonial-section {
            background: #e8f4fc;
            padding: 40px;
            border-radius: 10px;
            margin: 40px 0;
            text-align: center;
        }
        
        .testimonial-text {
            font-size: 1.3em;
            font-style: italic;
            margin-bottom: 20px;
            color: #2c3e50;
        }
        
        .testimonial-author {
            font-weight: bold;
            color: #3498db;
        }
        
        .alibaba-review {
            text-align: center;
            margin: 40px 0;
            padding: 30px;
            background: #f8f9fa;
            border-radius: 10px;
        }
        
        .alibaba-review img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
        
        .alibaba-review p {
            margin-top: 15px;
            color: #7f8c8d;
            font-style: italic;
        }
        
        .conclusion {
            background: #2c3e50;
            color: white;
            padding: 50px 40px;
            text-align: center;
            border-radius: 10px;
            margin: 40px 0;
        }
        
        .conclusion h2 {
            color: white;
            border: none;
            padding: 0;
            margin-bottom: 20px;
        }
        
        .cta-section {
            text-align: center;
            padding: 40px;
            background: #f8f9fa;
            border-radius: 10px;
        }
        
        .cta-button {
            display: inline-block;
            background: #e74c3c;
            color: white;
            padding: 15px 30px;
            text-decoration: none;
            border-radius: 5px;
            font-weight: bold;
            font-size: 1.1em;
            margin-top: 20px;
            transition: background 0.3s;
        }
        
        .cta-button:hover {
            background: #c0392b;
        }
        
        @media (max-width: 768px) {
            .case-header {
                padding: 40px 20px;
            }
            
            .case-header h1 {
                font-size: 2em;
            }
            
            .content-section {
                padding: 30px 20px;
            }
            
            .client-profile {
                flex-direction: column;
                text-align: center;
            }
            
            .client-avatar {
                margin-right: 0;
                margin-bottom: 15px;
            }
            
            .image-gallery {
                grid-template-columns: 1fr;
            }
            
            .video-container iframe {
                height: 300px;
            }
        }