server {
    listen 80;
    server_name _;

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

    # Starlight static site
    location / {
        try_files $uri $uri/ $uri.html =404;
    }

    # SPA fallback for client-side routing
    location ~ ^/[^.]+$ {
        try_files $uri $uri.html =404;
    }

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

    # Security headers
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
}