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

    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_min_length 256;
    gzip_types
        text/plain
        text/css
        text/javascript
        application/javascript
        application/json
        application/manifest+json
        image/svg+xml;

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

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

    # Service worker - no cache
    location /sw.js {
        expires off;
        add_header Cache-Control "no-store, no-cache, must-revalidate";
    }

    # API proxy
    location /api {
        proxy_pass http://backend:8000;
        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 60s;
    }
}