Options -Indexes
RewriteEngine On

# Si fichier ou dossier existe, servir directement
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]

# /app/jeu/[slug] → jeu.html
RewriteRule ^jeu/([a-zA-Z0-9_-]+)/?$ /app/jeu.html [L,QSA]

# /app/admin → admin.html
RewriteRule ^admin/?$ /app/admin.html [L]

# /app/client → client.html
RewriteRule ^client/?$ /app/client.html [L]