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

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

    # ---- 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;
    add_header Permissions-Policy "geolocation=(), microphone=(), camera=()" always;

    # ---- SPA fallback (no-op today, but keeps future client routes working) ----
    location / {
        try_files $uri $uri/ /index.html;
    }

    # ---- Vite emits content-hashed filenames under /assets — safe to cache forever ----
    location /assets/ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        access_log off;
    }

    # ---- index.html must always revalidate so deploys pick up immediately ----
    location = /index.html {
        add_header Cache-Control "no-cache, no-store, must-revalidate";
    }

    # ---- gzip ----
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types
        text/plain
        text/css
        text/xml
        text/javascript
        application/json
        application/javascript
        application/xml
        application/xml+rss
        application/wasm;
}