body {
            font-family: Arial, sans-serif;
            line-height: 1.6;
            margin: 0;
            padding: 0;
            color: #333;
            background-color: #f9f9f9;
        }
        header {
            background-color: #4CAF50;
            color: white;
            padding: 1rem;
            text-align: center;
            position: relative;
        }
        header h1 {
            margin: 0;
            font-size: 2rem;
        }
        .logo {
            font-weight: bold;
            font-size: 2.2rem;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
        }
        nav {
            background-color: #333;
            overflow: hidden;
        }
        nav a {
            float: left;
            display: block;
            color: white;
            text-align: center;
            padding: 14px 16px;
            text-decoration: none;
        }
        nav a:hover {
            background-color: #ddd;
            color: black;
        }
        .mobile-menu-btn {
            display: none;
            cursor: pointer;
            background-color: #333;
            color: white;
            border: none;
            padding: 10px;
            font-size: 1.5rem;
        }
        @media screen and (max-width: 600px) {
            nav a:not(:first-child) {display: none;}
            nav a.mobile-menu-btn {
                float: right;
                display: block;
            }
        }
        @media screen and (max-width: 600px) {
            nav.responsive {position: relative;}
            nav.responsive .mobile-menu-btn {
                position: absolute;
                right: 0;
                top: 0;
            }
            nav.responsive a {
                float: none;
                display: block;
                text-align: left;
            }
        }
        .container {
            max-width: 1200px;
            margin: 20px auto;
            padding: 0 20px;
        }
        .download-btn, .login-btn {
            display: inline-block;
            background-color: #4CAF50;
            color: white;
            padding: 10px 20px;
            margin: 10px 0;
            text-decoration: none;
            border-radius: 5px;
            font-weight: bold;
        }
        .download-btn:hover, .login-btn:hover {
            background-color: #45a049;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            margin: 20px auto;
        }
        footer {
            background-color: #333;
            color: white;
            text-align: center;
            padding: 1rem;
            margin-top: 20px;
        }
        footer a {
            color: #4CAF50;
            text-decoration: none;
        }
        h2, h3 {
            color: #4CAF50;
        }