server {
    listen 80;
    server_name localhost;
    root /static-files;
    
    location / {
        # Handle preflight requests first
        if ($request_method = 'OPTIONS') {
            add_header Access-Control-Allow-Origin "*" always;
            add_header Access-Control-Allow-Methods "GET, POST, OPTIONS" always;
            add_header Access-Control-Allow-Headers "Origin, Content-Type, Accept, Authorization" always;
            add_header Access-Control-Max-Age 3600 always;
            return 204;
        }
        
        # Serve static files
        try_files $uri $uri/ =404;
        
        # Add CORS headers for actual requests
        add_header Access-Control-Allow-Origin "*" always;
        add_header Access-Control-Allow-Methods "GET, POST, OPTIONS" always;
        add_header Access-Control-Allow-Headers "Origin, Content-Type, Accept, Authorization" always;
        
        # Aggressive caching - 1 year
        add_header Cache-Control "public, max-age=31536000, immutable" always;
        add_header Expires "Thu, 31 Dec 2037 23:55:55 GMT" always;
        
        # Set proper content type for markdown files
        location ~* \.md$ {
            add_header Content-Type "text/markdown; charset=utf-8";
            # Aggressive caching for markdown too
            add_header Cache-Control "public, max-age=31536000, immutable" always;
            add_header Expires "Thu, 31 Dec 2037 23:55:55 GMT" always;
        }
        
        # Enable gzip compression for better performance
        gzip on;
        gzip_types text/plain text/css text/markdown application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
    }
}