body { font-family: Arial, sans-serif; line-height: 1.6; margin: 0; padding: 0; color: #333; }
        header { background-color: #0077cc; color: white; padding: 1rem; text-align: center; position: relative; }
        header h1 { margin: 0; font-size: 2rem; }
        .logo { font-weight: bold; font-size: 1.5rem; text-shadow: 2px 2px 4px rgba(0,0,0,0.3); }
        nav { display: flex; justify-content: center; gap: 1rem; margin-top: 1rem; }
        nav a { color: white; text-decoration: none; }
        .mobile-nav-toggle { display: none; position: absolute; top: 1rem; right: 1rem; background: none; border: none; color: white; font-size: 1.5rem; }
        @media (max-width: 768px) {
            nav { display: none; flex-direction: column; align-items: center; }
            nav.active { display: flex; }
            .mobile-nav-toggle { display: block; }
        }
        main { padding: 1rem; max-width: 1200px; margin: 0 auto; }
        section { margin-bottom: 2rem; }
        h2 { color: #0077cc; font-size: 1.5rem; margin-top: 1.5rem; }
        h3 { color: #005599; font-size: 1.2rem; margin-top: 1rem; }
        .btn { display: inline-block; background-color: #0077cc; color: white; padding: 0.5rem 1rem; text-decoration: none; border-radius: 5px; margin: 0.5rem 0; }
        .download-btn { background-color: #28a745; }
        .login-btn { background-color: #ffc107; color: #333; }
        img { max-width: 100%; height: auto; display: block; margin: 1rem auto; }
        footer { background-color: #333; color: white; text-align: center; padding: 1rem; }
        .tags { margin-top: 1rem; }
        .tag { display: inline-block; background-color: #555; color: white; padding: 0.2rem 0.5rem; border-radius: 3px; margin: 0.2rem; text-decoration: none; }