:root {
            --primary-color: #007cba;
            --secondary-color: #4c4084;
            --text-dark: #333;
            --bg-light: #f4f4f4;
            --white: #ffffff;
        }
        * { box-sizing: border-box; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif; margin: 0; line-height: 1.6; color: var(--text-dark); background: var(--bg-light); }
        header { background: var(--white); padding: 20px; border-bottom: 3px solid var(--primary-color); }
        .container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
        nav { display: flex; gap: 20px; background: #333; padding: 10px 20px; color: white; flex-wrap: wrap; }
        nav a { color: white; text-decoration: none; font-size: 0.9em; }
        .hero { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; padding: 40px 0; }
        .article-card { background: var(--white); padding: 15px; border-radius: 8px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); }
        .img-placeholder { width: 100%; height: 200px; background: linear-gradient(135deg, #007cba, #4c4084); border-radius: 4px; display: flex; align-items: center; justify-content: center; color: white; }
        .post-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 30px; padding: 40px 0; }
        footer { background: #222; color: #aaa; text-align: center; padding: 40px; margin-top: 50px; }
        @media (max-width: 768px) { .hero { grid-template-columns: 1fr; } }