server {
    listen 80;
    server_name localhost;
    resolver 127.0.0.11 valid=30s ipv6=off;

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

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

    # API proxy
    location /api/ {
        # Use Docker DNS dynamic resolution to avoid stale container IP after recreate.
        set $gateway_upstream http://gateway:8888;
        proxy_pass $gateway_upstream;
        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;
    }

    # Upload files
    location /uploads/ {
        alias /usr/share/nginx/uploads/;
        expires 30d;
        add_header Cache-Control "public, immutable";
    }

    # Static assets cache
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        expires 30d;
        add_header Cache-Control "public, immutable";
    }
}