body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
    color: #333;
}

.navbar {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
    font-weight: bold;
    color: #007bff;
}

.nav-link {
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #0056b3;
}

.container {
    max-width: 900px;
}

h1, h2 {
    color: #007bff;
    border-bottom: 2px solid #e9ecef;
    padding-bottom: 10px;
}

.btn-primary {
    background-color: #007bff;
    border: none;
    transition: background-color 0.3s ease;
}

.btn-primary:hover {
    background-color: #0056b3;
}

#codeEditor {
    font-family: 'Courier New', Courier, monospace;
    background-color: #fff;
    border: 1px solid #ced4da;
    padding: 10px;
    resize: vertical;
}

#preview {
    background-color: #fff;
    min-height: 200px;
}

.alert {
    animation: fadeIn 0.5s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}