body {
            font-family: Arial, sans-serif;
            line-height: 1.6;
            color: #333;
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }
        h1 {
            color: #2a5caa;
            border-bottom: 2px solid #f0f0f0;
            padding-bottom: 10px;
        }
        h2 {
            color: #3a6ea5;
            margin-top: 30px;
        }
        h3 {
            color: #4a7eaa;
        }
        .image-placeholder {
            background-color: #f5f5f5;
            border: 1px dashed #ccc;
            padding: 20px;
            text-align: center;
            margin: 20px 0;
        }
        .tip-box {
            background-color: #f9f9f9;
            border-left: 4px solid #2a5caa;
            padding: 15px;
            margin: 20px 0;
        }