body { font-family: 'Arial', sans-serif; line-height: 1.6; margin: 0; padding: 0; color: #333; background-color: #f9f9f9; }
        header { background-color: #0066cc; color: white; padding: 1rem; text-align: center; position: relative; }
        .logo { font-size: 2rem; font-weight: bold; text-transform: uppercase; }
        nav { display: flex; justify-content: center; gap: 1.5rem; margin-top: 1rem; }
        nav a { color: white; text-decoration: none; }
        .mobile-nav-toggle { display: none; position: absolute; top: 1rem; right: 1rem; }
        @media (max-width: 768px) {
            nav { display: none; flex-direction: column; }
            .mobile-nav-toggle { display: block; }
            .mobile-nav-toggle.active + nav { display: flex; }
        }
        main { max-width: 1200px; margin: 2rem auto; padding: 0 1rem; }
        h1, h2, h3 { color: #004d99; }
        h1 { font-size: 2.2rem; }
        h2 { font-size: 1.8rem; margin-top: 2rem; }
        h3 { font-size: 1.5rem; margin-top: 1.5rem; }
        img { max-width: 100%; height: auto; margin: 1rem 0; }
        .download-btn, .login-btn { display: inline-block; background-color: #009933; color: white; padding: 0.8rem 1.5rem; margin: 1rem 0; text-decoration: none; border-radius: 5px; }
        .player-tip { background-color: #e6f2ff; padding: 1rem; margin: 1rem 0; border-left: 4px solid #0066cc; }
        footer { background-color: #333; color: white; text-align: center; padding: 1.5rem; margin-top: 2rem; }
        .tag-cloud { margin: 2rem 0; }
        .tag-cloud a { color: #0066cc; margin: 0 0.5rem; text-decoration: none; }