static/style.css

/* Minimal style for English Helper demo */
body { font-family: Inter, ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial; background:#f8fafc; color:#0f172a; }
.container { max-width:1100px; margin:0 auto; padding:1rem; }
.site-nav { background:#fff; border-bottom:1px solid #e5e7eb; }
.site-nav a { margin-right:1rem; color:#374151; text-decoration:none; font-weight:600; }
.site-nav a:hover { color:#1d4ed8; }
.bg-blue { background:#3b82f6; color:#fff; }
.button { background:#3b82f6; color:#fff; padding:0.5rem 1rem; border-radius:6px; }
.card { background:#fff; border:1px solid #e5e7eb; padding:1rem; border-radius:8px; }
```