# Enable rewrite engine
RewriteEngine On

# Force HTTPS (handled by Pangolin/Cloudflare, but just in case)
# RewriteCond %{HTTPS} off
# RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

# Remove trailing slashes (except for directories)
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)/$ /$1 [L,R=301]

# Security headers
<IfModule mod_headers.c>
    Header set X-Content-Type-Options "nosniff"
    Header set X-Frame-Options "SAMEORIGIN"
    Header set X-XSS-Protection "1; mode=block"
    Header set Referrer-Policy "strict-origin-when-cross-origin"
</IfModule>

# Prevent directory listing
Options -Indexes

# Block access to hidden files
<FilesMatch "^\.">
    Require all denied
</FilesMatch>

# Cache static assets
<IfModule mod_expires.c>
    ExpiresActive On
    ExpiresByType text/css "access plus 1 month"
    ExpiresByType application/javascript "access plus 1 month"
    ExpiresByType image/jpeg "access plus 1 year"
    ExpiresByType image/png "access plus 1 year"
    ExpiresByType image/svg+xml "access plus 1 year"
    ExpiresByType image/webp "access plus 1 year"
    ExpiresByType font/woff2 "access plus 1 year"
</IfModule>

# Gzip compression
<IfModule mod_deflate.c>
    AddOutputFilterByType DEFLATE text/html text/css application/javascript text/plain application/json image/svg+xml
</IfModule>

# Custom error pages
ErrorDocument 404 /404.php