Tailwind

Instructions

• Use Tailwind CSS classes to style HTML, check and use existing tailwind conventions within the project before writing your own.
• Offer to extract repeated patterns into components that match the project's conventions (i.e. Blade, JSX, Vue, etc..)
• Think through class placement, order, priority, and defaults - remove redundant classes, add classes to parent or child carefully to limit repetition, group elements logically
• Always use Tailwind CSS v4 - do not use the deprecated utilities.
• corePlugins is not supported in Tailwind v4.

Dark Mode

• If existing pages and components support dark mode, new pages and components must support dark mode in a similar way, typically using dark:.

Examples

• In Tailwind v4, configuration is CSS-first using the @theme directive — no separate tailwind.config.js file is needed.

  @theme { --color-brand: oklch(0.72 0.11 178); }

• In Tailwind v4, you import Tailwind using a regular CSS @import statement, not using the @tailwind directives used in v3:

- @tailwind base; - @tailwind components; - @tailwind utilities; + @import "tailwindcss";

Replaced Utilities

• Tailwind v4 removed deprecated utilities. Do not use the deprecated option - use the replacement.
• Opacity values are still numeric.

| Deprecated | Replacement |
|------------+--------------|
| bg-opacity-_ | bg-black/_ |
| text-opacity-_ | text-black/_ |
| border-opacity-_ | border-black/_ |
| divide-opacity-_ | divide-black/_ |
| ring-opacity-_ | ring-black/_ |
| placeholder-opacity-_ | placeholder-black/_ |
| flex-shrink-_ | shrink-_ |
| flex-grow-_ | grow-_ |
| overflow-ellipsis | text-ellipsis |
| decoration-slice | box-decoration-slice |
| decoration-clone | box-decoration-clone |

Spacing

• When listing items, use gap utilities for spacing, don't use margins.