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

    location = /favicon.ico {
        rewrite ^ /favicon.png permanent;
    }

    # Flutter Web SPA — all routes go to index.html
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Cache static assets
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/javascript;
}