@orbitalmartian yes you can and its the recommended way. You define your colors as variables in :root, then just change the variable values inside the media
```/* 1. Default colors */
:root {
--text-color: #222;
--bg-color: #fff;
}

/* 2. Override for dark mode */
@media (prefers-color-scheme: dark) {
:root {
--text-color: #eee;
--bg-color: #121212;
}
}

/* 3. Use them everywhere! */
body {
color: var(--text-color);
background-color: var(--bg-color);
}```