body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        .logo { font-size: 28px; font-weight: bold; color: #1a73e8; margin-bottom: 20px; text-align: center; }
        nav { background: #f8f9fa; padding: 15px; border-radius: 8px; margin-bottom: 20px; }
        nav ul { list-style: none; padding: 0; display: flex; justify-content: center; flex-wrap: wrap; }
        nav ul li { margin: 0 15px; }
        nav ul li a { text-decoration: none; color: #1a73e8; font-weight: 500; }
        .mobile-nav-btn { display: none; background: #1a73e8; color: white; border: none; padding: 10px 15px; border-radius: 5px; cursor: pointer; }
        h1 { color: #0d47a1; border-bottom: 2px solid #1a73e8; padding-bottom: 10px; }
        h2 { color: #1565c0; margin-top: 30px; }
        h3 { color: #1976d2; }
        .download-btn, .login-btn { display: inline-block; background: #4caf50; color: white; padding: 12px 25px; margin: 15px 0; border-radius: 5px; text-decoration: none; font-weight: bold; }
        .login-btn { background: #2196f3; }
        img { max-width: 100%; height: auto; margin: 20px 0; border-radius: 8px; }
        .tags { margin: 20px 0; }
        .tags a { background: #e3f2fd; color: #0d47a1; padding: 5px 10px; margin-right: 5px; border-radius: 15px; text-decoration: none; }
        footer { margin-top: 40px; padding: 20px; background: #f5f5f5; border-radius: 8px; text-align: center; }
        @media (max-width: 768px) {
            nav ul { display: none; }
            .mobile-nav-btn { display: block; margin: 0 auto 20px; }
            .nav-active { display: block; }
            body { padding: 10px; }
        }