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

    # index.html must never be cached — it references hashed asset filenames
    # that change on every build. Stale HTML → wrong JS bundle → broken app.
    location = /index.html {
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        add_header Pragma "no-cache";
    }

    # Hashed JS/CSS/image assets are safe to cache forever — the filename
    # changes whenever the content changes, so there's no stale-file risk.
    location ~* \.(?:js|css|woff2?|svg|png|jpg|ico)$ {
        add_header Cache-Control "public, max-age=31536000, immutable";
        try_files $uri =404;
    }

    location / {
        try_files $uri $uri/ /index.html;
    }

    location /api/ {
        proxy_pass http://server:3000;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        client_max_body_size 20M;
    }

    location /uploads/ {
        proxy_pass http://server:3000;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
    }
}