body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        .mobile-nav { display: none; }
        @media (max-width: 768px) {
            .desktop-nav { display: none; }
            .mobile-nav { display: block; position: fixed; top: 0; left: 0; right: 0; background: #FF6B35; color: white; padding: 10px; z-index: 100; }
            .nav-toggle { background: #FF4500; border: none; color: white; padding: 8px 15px; cursor: pointer; }
        }
        h1 { color: #FF4500; border-bottom: 3px solid #FF6B35; padding-bottom: 10px; }
        h2 { color: #FF6B35; margin-top: 30px; }
        h3 { color: #FF8C66; }
        .logo { font-size: 28px; font-weight: bold; color: #FF4500; text-decoration: none; }
        nav a { margin: 0 15px; color: #FF4500; text-decoration: none; font-weight: 500; }
        .download-btn, .login-btn { background: #4CAF50; color: white; padding: 12px 25px; border-radius: 5px; text-decoration: none; display: inline-block; margin: 15px 0; }
        .login-btn { background: #2196F3; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .tag { background: #f0f0f0; padding: 5px 10px; border-radius: 15px; margin: 5px; display: inline-block; }
        footer { margin-top: 40px; padding-top: 20px; border-top: 1px solid #eee; }
        .copyright { margin-top: 20px; font-size: 0.9em; color: #666; }