How can I implement fallbacks for CSS variables?

How can I implement fallbacks for CSS variables?

You can use a traditional CSS property as a fallback before the CSS variable. For example:

:root {
  --main-color: #3498db;
  color: #3498db; /* Fallback */
}

What if the browser doesn't support CSS variables at all?

In that case, you should define the fallback value directly in the property. For example:

.element {
  color: #3498db; /* Fallback for unsupported browsers */
  color: var(--main-color, #3498db); /* CSS variable with fallback */
}

Are there any tools to help with this?

Yes, tools like PostCSS can help you automatically add fallbacks for CSS variables during your build process.

Can I use CSS variables in media queries?

Absolutely! You can use CSS variables in media queries just like any other CSS property. For example:

@media (max-width: 600px) {
  :root {
    --main-color: #e74c3c;
  }
}