body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1 { color: #FF9900; text-align: center; margin-bottom: 30px; }
        h2 { color: #1E88E5; border-bottom: 2px solid #FF9900; padding-bottom: 5px; }
        h3 { color: #43A047; }
        .download-btn { background: #FF9900; color: white; padding: 12px 25px; border-radius: 30px; text-decoration: none; display: inline-block; margin: 15px 0; font-weight: bold; }
        .login-btn { background: #1E88E5; color: white; padding: 12px 25px; border-radius: 30px; text-decoration: none; display: inline-block; margin: 15px 0; font-weight: bold; }
        .nav-mobile { display: none; }
        .nav-pc { display: flex; justify-content: space-around; background: #FF9900; padding: 15px; }
        .nav-pc a { color: white; text-decoration: none; font-weight: bold; }
        .image-container { text-align: center; margin: 25px 0; }
        img { max-width: 100%; height: auto; }
        @media (max-width: 768px) {
            .nav-pc { display: none; }
            .nav-mobile { display: block; background: #FF9900; padding: 10px; text-align: center; }
            #toggleNav { background: #1E88E5; color: white; border: none; padding: 10px 20px; cursor: pointer; }
            .nav-content { display: none; background: #FFEB3B; padding: 15px; }
            .nav-content a { display: block; color: #1E88E5; padding: 8px 0; }
        }