* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f8f9fa;
            padding: 20px;
        }
        .article-container {
            max-width: 100%px;
            margin: 0 auto;
            background: white;
            padding: 40px;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            overflow-wrap: break-word;
        }
        h1 {
            font-size: 2.5rem;
            margin-bottom: 20px;
            color: #2c3e50;
            line-height: 1.2;
        }
        h2 {
            font-size: 1.8rem;
            margin: 35px 0 15px;
            color: #2980b9;
            border-bottom: 2px solid #ecf0f1;
            padding-bottom: 8px;
        }
        p {
            margin-bottom: 20px;
            font-size: 1.1rem;
        }
        .intro {
            font-size: 1.2rem;
            background: #f0f8ff;
            padding: 20px;
            border-left: 4px solid #3498db;
            border-radius: 0 5px 5px 0;
            margin-bottom: 30px;
        }
        .key-term {
            font-weight: 600;
            color: #e74c3c;
        }
        ul {
            margin: 20px 0;
            padding-left: 30px;
        }
        li {
            margin-bottom: 12px;
        }
        .section-highlight {
            background: #f8f9fa;
            padding: 20px;
            border-radius: 5px;
            margin: 25px 0;
            border-left: 3px solid #3498db;
        }
        .conclusion {
            background: #e8f4fc;
            padding: 25px;
            border-radius: 5px;
            margin-top: 30px;
            border-top: 2px solid #3498db;
        }
        @media (max-width: 768px) {
            .article-container {
                padding: 25px;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.5rem;
            }
        }