server {
    listen 80 default_server;
    listen [::]:80 default_server;
    server_name _;

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

    # gzip
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_types
        text/plain
        text/css
        text/javascript
        text/xml
        application/javascript
        application/json
        application/xml
        application/xml+rss
        image/svg+xml
        font/ttf
        font/otf;

    # 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 (Astro hashes filenames)
    location ~* \.(?:js|css|woff2?|ttf|otf|eot|svg|jpg|jpeg|png|webp|avif|ico)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        try_files $uri =404;
    }

    # Don't cache HTML
    location ~* \.html$ {
        expires -1;
        add_header Cache-Control "no-cache, no-store, must-revalidate";
    }

    # Thai URL slugs (Astro file-based routing produces paths with UTF-8 chars)
    location / {
        try_files $uri $uri/ $uri.html /index.html;
    }

    # healthcheck
    location /healthz {
        access_log off;
        return 200 "ok\n";
        add_header Content-Type text/plain;
    }
}