:root {
            --primary: #0076b1;
            --light-blue: #9aceee;
            --bg-light: #ffffcc;
            --text: #333;
            --border: #cccccc;
        }

        body { font-family: Arial, Helvetica, sans-serif; background: #fdfdfd; color: var(--text); margin: 0; line-height: 1.6; }
        .main-container { max-width: 1000px; margin: 0 auto; padding: 10px; background: #fff; box-shadow: 0 0 10px rgba(0,0,0,0.1); }
        
        header { border-bottom: 2px solid var(--primary); padding-bottom: 10px; margin-bottom: 20px; }
        .nav-menu { background: #333; padding: 10px; display: flex; flex-wrap: wrap; justify-content: center; gap: 15px; }
        .nav-menu a { color: white; text-decoration: none; font-weight: bold; padding: 5px 15px; }
        .nav-menu a:hover { background: var(--primary); }

        .layout { display: grid; grid-template-columns: 200px 1fr; gap: 20px; }
        @media (max-width: 768px) { .layout { grid-template-columns: 1fr; } }

        .side-nav { background: #f4f4f4; padding: 10px; }
        .side-nav a { display: block; padding: 8px; border-bottom: 1px solid #ddd; text-decoration: none; color: #444; }
        
        .content-area { background: var(--bg-light); padding: 20px; border: 1px solid var(--border); }
        .main-img { max-width: 100%; height: auto; border: 5px solid #fff; box-shadow: 0 2px 5px rgba(0,0,0,0.2); margin: 10px 0; border-radius: 4px; }

        footer { margin-top: 40px; padding: 20px; background: #eee; text-align: center; border-top: 3px solid var(--primary); }
        
        .btn-ready { display: inline-block; padding: 5px 10px; background: #0076b1; color: white; text-decoration: none; font-size: 12px; }