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

    # Deny dotfiles, configs, scripts, source — defense in depth
    location ~ /\. {
        deny all;
        return 404;
    }
    location ~* \.(env|env\.example|conf|yml|yaml|py|pyc|md|txt|sh|sql|log|bak|old|swp|dockerfile)$ {
        deny all;
        return 404;
    }
    location = /Dockerfile {
        deny all;
        return 404;
    }

    # API proxy — strip /api/ prefix, forward to Node.js service
    location /api/ {
        proxy_pass         http://api:3001/;
        proxy_http_version 1.1;
        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_read_timeout 10s;
        proxy_connect_timeout 5s;
    }

    # Flat HTML — serve /locations/buffalo as /locations/buffalo.html
    location / {
        try_files $uri $uri/ $uri.html =404;
    }

    # Cache static assets
    location ~* \.(jpg|jpeg|png|webp|svg|ico|css|js|woff2?|mp4|webm)$ {
        expires 30d;
        add_header Cache-Control "public, immutable";
        access_log off;
    }

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

    # Gzip
    gzip on;
    gzip_types text/html text/css application/javascript image/svg+xml;
    gzip_min_length 1024;

    error_page 404 /index.html;
}