body.dark { background-color: #1a1a1a; color: white; font-family: sans-serif; }
.sidebar { width: 200px; float: left; padding: 1em; background: #111; height: 100vh; }
.main { margin-left: 220px; padding: 2em; }
textarea { width: 100%; height: 100px; background: #333; color: white; padding: 1em; }
.preview { background: #222; padding: 1em; margin-top: 1em; }
.progress-bar { margin-top: 1em; color: lime; }
button { padding: 0.5em 1em; background: orange; border: none; color: black; }