server {
    listen 80;
    root /usr/share/nginx/html;
    index index.html;

    # Health check
    location = /health {
        return 200 '{"status":"ok"}';
        add_header Content-Type application/json;
    }

    # Static assets — cache aggressively
    location /static/ {
        expires 1h;
        add_header Cache-Control "public, immutable";
    }

    # SPA fallback — all other paths serve index.html
    location / {
        try_files $uri $uri/ /index.html;
        add_header Cache-Control "no-cache";
    }
}