body{margin:0;font-family:Arial,sans-serif;background:#1e1e1e;color:#fff}
.toolbar{padding:10px;display:flex;gap:8px;background:#111}
#layout{display:flex;height:calc(100vh - 50px)}
#editor,#previewPane{width:50%;height:100%}
#preview{width:100%;height:100%;border:none;background:#fff}
.light{background:#f5f5f5;color:#111}
button,input,select{padding:8px}