body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; margin: 0; padding: 0; }
        .header { background: #2c3e50; color: white; padding: 1rem; text-align: center; position: relative; }
        .logo { font-size: 2rem; font-weight: bold; margin-bottom: 0.5rem; }
        .nav { display: flex; justify-content: center; gap: 1.5rem; }
        .nav a { color: white; text-decoration: none; }
        .mobile-nav-toggle { display: none; position: absolute; right: 1rem; top: 1rem; }
        .content { max-width: 1000px; margin: 2rem auto; padding: 0 1rem; }
        h1, h2, h3 { color: #e74c3c; margin-top: 2rem; }
        h1 { font-size: 2.2rem; }
        h2 { font-size: 1.8rem; }
        h3 { font-size: 1.5rem; }
        .download-btn, .login-btn { display: inline-block; background: #e74c3c; color: white; padding: 0.8rem 1.5rem; margin: 1rem 0; text-decoration: none; border-radius: 5px; }
        .image-container { text-align: center; margin: 2rem 0; }
        .image-container img { max-width: 100%; height: auto; }
        .footer { background: #2c3e50; color: white; text-align: center; padding: 1.5rem; margin-top: 2rem; }
        .tags { margin: 1.5rem 0; }
        .tags a { background: #3498db; color: white; padding: 0.3rem 0.6rem; margin: 0.2rem; text-decoration: none; border-radius: 3px; display: inline-block; }
        @media (max-width: 768px) {
            .nav { flex-direction: column; display: none; }
            .nav.active { display: flex; }
            .mobile-nav-toggle { display: block; }
            h1 { font-size: 1.8rem; }
            h2 { font-size: 1.5rem; }
        }