server {
  listen 80;
  server_name _;

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

  # Static assets — long cache
  location /assets/ {
    expires 30d;
    add_header Cache-Control "public, immutable";
    try_files $uri =404;
  }

  # API proxy to the backend service (docker-compose internal DNS)
  location /api/ {
    proxy_pass http://backend:4000/api/;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_read_timeout 120s;
    client_max_body_size 15M;
  }

  # SPA fallback
  location / {
    try_files $uri $uri/ /index.html;
  }
}