Enqueue ALL the CSS files from the theme and generate to the FRONTEND ONLY

<?php
/**
 * Auto-enqueue all CSS files from the theme directory for frontend
 */
function auto_enqueue_theme_styles() {
    // Only proceed if we're on the frontend
    if (!is_admin()) {
        // Get the theme directory path
        $theme_dir = get_template_directory();

        // Function to recursively get all CSS files
        function get_all_css_files($dir) {
            $css_files = array();

            // Get all files in the current directory
            $files = glob($dir . '/**/*.css');

            foreach ($files as $file) {
                // Skip admin-specific CSS files
                if (strpos($file, 'admin') === false) {
                    $css_files[] = $file;
                }
            }

            return $css_files;
        }

        // Get all CSS files from theme directory
        $css_files = get_all_css_files($theme_dir);

        // Sort files to ensure consistent loading order
        sort($css_files);

        // Make sure style.css loads first if it exists
        $main_style = get_template_directory() . '/style.css';
        if (file_exists($main_style)) {
            wp_enqueue_style(
                'theme-main-style',
                get_template_directory_uri() . '/style.css',
                array(),
                filemtime($main_style),
                'all'
            );
        }

        // Enqueue all other CSS files
        foreach ($css_files as $css_file) {
            // Get the file path relative to the theme directory
            $relative_path = str_replace($theme_dir . '/', '', $css_file);

            // Create a unique handle for each file
            $handle = 'theme-' . str_replace(['/', '.css'], ['-', ''], $relative_path);

            // Get the file's URI
            $css_uri = get_template_directory_uri() . '/' . $relative_path;

            // Skip style.css as it's already enqueued
            if ($relative_path !== 'style.css') {
                wp_enqueue_style(
                    $handle,
                    $css_uri,
                    array('theme-main-style'), // Make all styles dependent on main style.css
                    filemtime($css_file),
                    'all'
                );
            }
        }
    }
}
add_action('wp_enqueue_scripts', 'auto_enqueue_theme_styles');

/**
 * Optional: Add preload for critical CSS files
 */
function add_critical_css_preload() {
    if (!is_admin()) {
        // Add preload tags for important CSS files
        $critical_files = array(
            'style.css',
            'assets/css/critical.css'
        );

        foreach ($critical_files as $file) {
            $file_path = get_template_directory() . '/' . $file;
            if (file_exists($file_path)) {
                $file_url = get_template_directory_uri() . '/' . $file;
                echo '<link rel="preload" href="' . esc_url($file_url) . '" as="style">';
            }
        }
    }
}
add_action('wp_head', 'add_critical_css_preload', 1);