:root{
 --bg:#f2f4f8;
 --card:#ffffff;
 --text:#222;
 --muted:#666;
 --border:#ccc;
 --primary:#0066ff;
}

[data-theme="dark"]{
 --bg:#121212;
 --card:#1f1f1f;
 --text:#f1f1f1;
 --muted:#aaa;
 --border:#333;
 --primary:#4c8dff;
}