server {
    listen 80;
    server_name localhost;
    root /static-files;
    
    if ($request_method = 'OPTIONS') {
        add_header Access-Control-Allow-Origin "*" always;
        add_header Access-Control-Allow-Methods "GET, OPTIONS" always;
        add_header Access-Control-Allow-Headers "Origin, Content-Type, Accept, Authorization" always;
        return 204;
    }
    
    # Only serve markdown files
    location ~* \.md$ {
        try_files $uri =404;
        add_header Content-Type "text/markdown; charset=utf-8" always;
        add_header Access-Control-Allow-Origin "*" always;
        add_header Access-Control-Allow-Methods "GET, Options" always;
        add_header Access-Control-Allow-Headers "Origin, Content-Type, Accept, Authorization" always;
    }
    
    # Return 404 for everything else
    location / {
        return 404;
    }
}