server {
    listen 80;
    server_name _;

    # ------------------------------------------------------------------
    # HTTPS redirect — uncomment after running certbot:
    #   listen 443 ssl http2;
    #   ssl_certificate     /etc/letsencrypt/live/docs.arcline.it/fullchain.pem;
    #   ssl_certificate_key /etc/letsencrypt/live/docs.arcline.it/privkey.pem;
    #   include             /etc/letsencrypt/options-ssl-nginx.conf;
    #   add_header Strict-Transport-Security "max-age=63072000" always;
    #
    # And add a redirect block:
    #   server { listen 80; server_name _; return 301 https://$host$request_uri; }
    # ------------------------------------------------------------------

    root /usr/share/nginx/html;
    index index.html;

    # Custom 404
    error_page 404 /404.html;

    # robots.txt at root
    location = /robots.txt {
        try_files /robots.txt =404;
    }

    # Clean URLs: /section/page/ → /section/page/index.html
    location / {
        try_files $uri $uri/ $uri/index.html =404;
    }

    # Security headers
    add_header X-Frame-Options        "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff"    always;
    add_header Referrer-Policy        "strict-origin-when-cross-origin" always;

    # Cache static assets aggressively
    location ~* \.(css|js|woff2?|ttf|otf|svg|png|ico|webp|jpg)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    # Never cache HTML, JSON, or XML
    location ~* \.(html|json|xml)$ {
        expires -1;
        add_header Cache-Control "no-cache";
    }
}