server {
    listen 80;
    listen [::]:80;
    server_name _;
    
    root /usr/share/nginx/html;
    index index.html;

    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_comp_level 6;
    gzip_types
        text/plain
        text/css
        text/xml
        text/javascript
        application/javascript
        application/xml+rss
        application/json
        image/svg+xml;

    # Security headers
    add_header X-Frame-Options DENY;
    add_header X-Content-Type-Options nosniff;
    add_header X-XSS-Protection "1; mode=block";
    add_header Referrer-Policy "strict-origin-when-cross-origin";

    # Handle Vue Router history mode
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Cache static assets
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        access_log off;
    }

    # API proxy to backend on localhost (for CI/standalone frontend deployments)
    location /api/ {
        proxy_pass http://127.0.0.1:18888;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
        
        # CORS headers passthrough
        proxy_pass_header Access-Control-Allow-Origin;
        proxy_pass_header Access-Control-Allow-Methods;
        proxy_pass_header Access-Control-Allow-Headers;
        proxy_pass_header Access-Control-Allow-Credentials;
        
        # Logs for debugging
        access_log /var/log/nginx/api_proxy.log;
        error_log /var/log/nginx/api_proxy_error.log;
    }

    # Disable access to hidden files
    location ~ /\. {
        deny all;
        access_log off;
        log_not_found off;
    }

    # Custom error pages
    error_page 404 /index.html;
    error_page 500 502 503 504 /index.html;
}