server {
    listen 80;
    server_name _;
    server_tokens off;

    # Root directory for static files (must match Docker COPY path)
    root /usr/share/nginx/html;
    index index.html;

    # index.html must never be cached so new asset hashes are picked up
    location = /index.html {
        add_header Cache-Control "no-cache";
        try_files $uri /index.html;
    }

    # Hashed assets are immutable — cache indefinitely
    location /assets/ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    # SPA fallback
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Enable gzip compression
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
}