server {
    listen 3000;
    server_name _;

    root /opt/llm-trainer/frontend;
    index index.html;

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

    # Proxy REST API to FastAPI backend
    location /api/ {
        proxy_pass http://127.0.0.1:8080;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;

        # WebSocket support (terminal, log streaming)
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_read_timeout 86400;
    }
}
