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

    # SPA fallback — serve index.html for all routes
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Proxy API requests to the backend
    # Uses Docker's embedded DNS with a variable so nginx resolves at request
    # time rather than at startup — prevents crash if api is temporarily down.
    location /api/ {
        resolver 127.0.0.11 valid=10s;
        set $upstream http://api:8000;
        proxy_pass $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;
    }

    # Cache static assets
    location /assets/ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }
}