events { worker_connections 1024; }

http {
    include mime.types;
    default_type application/octet-stream;
    sendfile on;
    keepalive_timeout 65;
    client_max_body_size 110m;

    server {
        listen 80;

        # Security headers (Cloudflare handles TLS; these still apply)
        add_header X-Frame-Options DENY always;
        add_header X-Content-Type-Options nosniff always;
        add_header Referrer-Policy no-referrer always;
        add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; connect-src 'self' wss: https:;" always;

        # API
        location /api/ {
            proxy_pass http://backend:3001/api/;
            proxy_http_version 1.1;
            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 $http_x_forwarded_proto;
        }

        # WebSocket
        location /ws {
            proxy_pass http://backend:3001/ws;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "Upgrade";
            proxy_set_header Host $host;
            proxy_read_timeout 86400;
        }

        # Frontend (SPA)
        location / {
            proxy_pass http://frontend:80/;
            proxy_set_header Host $host;
        }
    }
}