body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; margin: 0; padding: 0; background-color: #f5f5f5; }
        header { background-color: #004d40; color: white; padding: 1rem; text-align: center; position: relative; }
        .logo { font-size: 2rem; font-weight: bold; text-shadow: 2px 2px 4px #000; }
        nav { display: flex; justify-content: center; gap: 2rem; margin-top: 1rem; }
        nav a { color: white; text-decoration: none; font-weight: bold; }
        .mobile-menu-btn { display: none; position: absolute; right: 1rem; top: 1rem; background: none; border: none; color: white; font-size: 1.5rem; }
        .container { max-width: 1200px; margin: 2rem auto; padding: 0 1rem; }
        h1 { color: #004d40; text-align: center; margin-bottom: 2rem; }
        h2 { color: #00796b; margin-top: 2rem; border-bottom: 2px solid #00796b; padding-bottom: 0.5rem; }
        h3 { color: #00897b; margin-top: 1.5rem; }
        .btn { display: inline-block; background-color: #004d40; color: white; padding: 0.5rem 1.5rem; text-decoration: none; border-radius: 5px; margin: 0.5rem 0; }
        .btn:hover { background-color: #00796b; }
        .download-section, .login-section { text-align: center; margin: 2rem 0; }
        img { max-width: 100%; height: auto; margin: 1rem 0; border-radius: 8px; }
        .tags { margin: 2rem 0; }
        .tag { display: inline-block; background-color: #e0e0e0; padding: 0.3rem 0.8rem; margin-right: 0.5rem; border-radius: 20px; text-decoration: none; color: #333; }
        footer { background-color: #004d40; color: white; text-align: center; padding: 1rem; margin-top: 2rem; }
        @media (max-width: 768px) {
            nav { flex-direction: column; align-items: center; display: none; }
            nav.active { display: flex; }
            .mobile-menu-btn { display: block; }
            .logo { font-size: 1.5rem; }
        }