* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            background-color: #f5f7fa;
            color: black;
            line-height: 1.6;
        }

        /* Navigation Bar */
        nav {
            background-color: #2c3e50;
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }

        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 2rem;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: bold;
        }

        .nav-links {
            display: flex;
            list-style: none;
        }

        .nav-links li {
            margin-left: 2rem;
        }

        .nav-links a {
            color: white;
            text-decoration: none;
            transition: color 0.3s;
        }

        .nav-links a:hover {
            color: #3498db;
        }
        
        footer {
            background-color: #2c3e50;
            color: white;
            padding: 2rem 0;
            margin-top: 3rem;
        }

        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 2rem;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
        }

        .footer-section {
            flex: 1;
            min-width: 250px;
            margin-bottom: 1.5rem;
        }

        .footer-title {
            font-size: 1.2rem;
            margin-bottom: 1rem;
            color: #3498db;
        }

        .footer-links {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 0.5rem;
        }

        .footer-links a {
            color: black;
            text-decoration: none;
            transition: color 0.3s;
        }

        .footer-links a:hover {
            color: white;
        }

        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #34495e;
            margin-top: 1.5rem;
            color: black;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .nav-container {
                flex-direction: column;
                padding: 1rem;
            }

            .nav-links {
                margin-top: 1rem;
            }

            .nav-links li {
                margin: 0 0.5rem;
            }

            .preview-container {
                flex-direction: column;
            }

            .controls {
                flex-direction: column;
            }
        }