@import statements fail to build with Filament v3.3.34 and Vite 7 - PostCSS cannot resolve vendor paths

[emmanpbarrameda]

The Filament Flat Theme package cannot be installed/used with Filament v3.3.34 when using modern build tools (Vite 7, Tailwind CSS v3, PostCSS). The @import statement recommended in the documentation causes PostCSS build failures.

Environment:

• Filament Version: v3.3.34
• Flat Theme Package: spykapp/filament-flat-theme (latest)
• Laravel Version: 12
• PHP Version: 8.2+
• Vite Version: 7.2.2
• Tailwind CSS Version: 3.4.18
• PostCSS Version: 8.x
• Node Version: Latest LTS

Expected Behavior:
Theme should compile successfully and apply flat design styles to Filament panel.

Actual Behavior:
Build fails with PostCSS error:
[vite:css] [postcss] postcss-import: C:...\node_modules\tailwindcss\lib\index.js:1:1: Unknown word "use strict"

The error occurs because:
PostCSS processes the @import statement
Follows the import chain through theme.css → Filament's theme.css → Tailwind references
PostCSS tries to read Tailwind's JavaScript file instead of CSS
Fails when encountering JavaScript syntax

Attempted Fixes (all failed):

✗ Using relative paths: @import '../../../../vendor/spykapp/...'
✗ Using absolute paths: @import '/vendor/spykapp/...'
✗ Different import orders (before/after @tailwind directives)
✗ Downgrading Vite to v5
✗ Installing postcss-nesting
✗ Various postcss.config.js configurations
✗ Copying vendor file to resources folder

[emmanpbarrameda]

up sir @sanchitspatil

[emmanpbarrameda]

up