body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; color: #333; background-color: #f0f8ff; }
        .container { max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1 { color: #003366; text-align: center; }
        h2 { color: #0066cc; border-bottom: 2px solid #0099ff; padding-bottom: 5px; }
        h3 { color: #0088cc; }
        .download-btn, .login-btn { 
            display: inline-block; 
            padding: 12px 24px; 
            margin: 10px 0; 
            background-color: #ff6600; 
            color: white; 
            text-decoration: none; 
            border-radius: 5px; 
            font-weight: bold; 
            transition: background-color 0.3s;
        }
        .download-btn:hover, .login-btn:hover { background-color: #e65c00; }
        .logo { 
            font-size: 28px; 
            font-weight: bold; 
            color: #003366; 
            text-align: center; 
            margin: 20px 0; 
            text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
        }
        nav { 
            background-color: #003366; 
            padding: 10px; 
            position: relative; 
        }
        nav ul { 
            list-style: none; 
            padding: 0; 
            margin: 0; 
            display: flex; 
            justify-content: center; 
            flex-wrap: wrap;
        }
        nav li { margin: 0 15px; }
        nav a { 
            color: white; 
            text-decoration: none; 
            font-weight: bold; 
        }
        .mobile-nav-toggle { 
            display: none; 
            position: absolute; 
            top: 10px; 
            right: 15px; 
            background: none; 
            border: none; 
            color: white; 
            font-size: 24px; 
            cursor: pointer; 
        }
        .image-container { 
            text-align: center; 
            margin: 20px 0; 
        }
        img { 
            max-width: 100%; 
            height: auto; 
            border-radius: 8px; 
        }
        table { 
            width: 100%; 
            border-collapse: collapse; 
            margin: 20px 0; 
        }
        th, td { 
            border: 1px solid #ddd; 
            padding: 8px; 
            text-align: left; 
        }
        th { background-color: #003366; color: white; }
        tr:nth-child(even) { background-color: #f2f2f2; }
        footer { 
            background-color: #003366; 
            color: white; 
            text-align: center; 
            padding: 20px; 
            margin-top: 30px; 
        }
        @media (max-width: 768px) {
            nav ul { flex-direction: column; align-items: center; display: none; }
            nav ul.active { display: flex; }
            .mobile-nav-toggle { display: block; }
            .container { padding: 10px; }
        }