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

    # Cache Control para el index.html y sw.js (NUNCA cachear)
    location ~* ^/(index\.html|sw\.js)$ {
        add_header Cache-Control "no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0";
    }

    # Cache Control para assets estáticos (Vite usa hashes)
    location /assets/ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

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

    location /api/ {
        resolver 127.0.0.11 valid=30s;
        set $backend_upstream backend-api;
        proxy_pass http://$backend_upstream:8000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
    }
}