RewriteEngine On

# Classic query-style links like /?page=main should keep working.
RewriteCond %{QUERY_STRING} (^|&)page= [NC]
RewriteRule ^$ wiki.php [QSA,L]

# Default experience: terminal UI.
RewriteRule ^$ terminal/ [QSA,L]

# If someone explicitly requests index.php with a page query, keep classic behavior.
RewriteCond %{QUERY_STRING} (^|&)page= [NC]
RewriteRule ^index\.php$ wiki.php [QSA,L]

# Otherwise, index.php also goes to the terminal UI.
RewriteRule ^index\.php$ terminal/ [QSA,L]

# Let real files and directories through untouched.
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]

# Pretty URLs for wiki pages (no leading digit).
RewriteRule ^([^0-9][A-Za-z0-9_-]*)/?$ wiki.php?page=$1 [QSA,L]