body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1 { color: #FF4500; text-align: center; }
        h2 { color: #008080; border-bottom: 2px solid #FFD700; }
        h3 { color: #8B4513; }
        .nav { background: #FF6347; padding: 10px; position: sticky; top: 0; display: flex; justify-content: space-between; }
        .nav-mobile { display: none; }
        .logo { font-size: 24px; font-weight: bold; color: white; }
        .btn { background: #4CAF50; color: white; padding: 8px 16px; border-radius: 4px; text-decoration: none; }
        .btn-login { background: #2196F3; }
        .content { margin: 20px 0; }
        .image { max-width: 100%; height: auto; margin: 20px 0; }
        .footer { background: #333; color: white; padding: 20px; text-align: center; }
        @media (max-width: 768px) {
            .nav { flex-direction: column; }
            .nav-desktop { display: none; }
            .nav-mobile { display: block; text-align: center; }
        }