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

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

    # Proxy API requests to backend
    location /api/ {
        proxy_pass http://webapp-api:8080;
        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-Telegram-Init-Data $http_x_telegram_init_data;
    }

    # Cache static assets
    location ~* \.(css|js|png|jpg|svg|woff2?)$ {
        expires 7d;
        add_header Cache-Control "public, immutable";
    }
}
