# SPA serving: static assets with long-lived caching, everything else
# falls back to index.html (client-side routing).
server {
    listen 8080;
    server_name _;
    root /usr/share/nginx/html;
    index index.html;

    gzip on;
    gzip_types text/css application/javascript application/json image/svg+xml;
    gzip_min_length 1024;

    location /healthz {
        add_header Content-Type text/plain;
        return 200 'ok';
    }

    location /assets/ {
        # Vite emits content-hashed filenames — safe to cache forever.
        add_header Cache-Control "public, max-age=31536000, immutable";
        try_files $uri =404;
    }

    location / {
        add_header Cache-Control "no-cache";
        # Strict CSP (security.md, ADR 0016): everything self-hosted, zero
        # third-party origins — fonts, scripts, styles, and XHR/WebSocket all
        # from this origin only (the GDPR "zero external requests" posture).
        # `style-src 'unsafe-inline'` covers the app's inline style attributes
        # (CSS custom properties, layout); scripts are all external files.
        # font-src includes `data:` for the subsetted fonts Excalidraw embeds
        # into saved sketch SVGs (inlined by the plugin fallback renderer on
        # public pages). data: fonts trigger no network request, so the
        # zero-third-party-request guarantee (security.md) is unaffected.
        add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; font-src 'self' data:; img-src 'self' data: blob:; connect-src 'self'; worker-src 'self'; manifest-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'" always;
        add_header X-Content-Type-Options "nosniff" always;
        try_files $uri /index.html;
    }
}