body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; color: #333; margin: 0; padding: 0; background-color: #f0f8ff; }
        .container { max-width: 1200px; margin: 0 auto; padding: 20px; }
        header { background-color: #1a5276; color: white; padding: 20px; text-align: center; position: relative; }
        .logo { font-size: 28px; font-weight: bold; text-shadow: 2px 2px 4px rgba(0,0,0,0.3); }
        nav { margin-top: 15px; }
        nav a { color: white; text-decoration: none; margin: 0 10px; font-weight: 500; }
        .mobile-nav-toggle { display: none; position: absolute; right: 20px; top: 20px; background: #fff; color: #1a5276; border: none; padding: 5px 10px; cursor: pointer; }
        h1 { color: #1a5276; margin-bottom: 20px; }
        h2 { color: #2874a6; border-bottom: 2px solid #2874a6; padding-bottom: 5px; margin-top: 30px; }
        h3 { color: #3498db; }
        .download-btn, .login-btn { display: inline-block; background-color: #2ecc71; color: white; padding: 10px 20px; margin: 15px 0; text-decoration: none; border-radius: 5px; font-weight: bold; }
        .login-btn { background-color: #e67e22; }
        .image-container { text-align: center; margin: 25px 0; }
        .image-container img { max-width: 100%; height: auto; border-radius: 8px; }
        footer { background-color: #1a5276; color: white; text-align: center; padding: 20px; margin-top: 30px; }
        .tags { margin: 20px 0; }
        .tag { display: inline-block; background-color: #3498db; color: white; padding: 5px 10px; margin: 5px; border-radius: 3px; }
        @media (max-width: 768px) {
            .mobile-nav-toggle { display: block; }
            nav { display: none; }
            nav.active { display: block; }
            nav a { display: block; margin: 10px 0; }
        }