server {
    listen 80;
    server_name localhost;

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

    # This line is CRUCIAL for Angular routing
    location / {
        try_files $uri $uri/ /index.html;
    }

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

    # Security headers (optional but recommended)
    add_header X-Content-Type-Options nosniff;
    add_header X-Frame-Options DENY;
    add_header X-XSS-Protection "1; mode=block";
}