body { font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif; margin: 0; }
    header { padding: 12px 16px; background:#111; color:#fff; }
    .container { max-width: 1100px; margin: 18px auto; padding: 0 16px; }
    .row { display:flex; gap:16px; align-items:center; flex-wrap:wrap; }
    select { padding:6px 8px; font-size: 14px; }
    .muted { color:#666; font-size: 13px; }
    canvas { max-width: 100%; }
    .legend { font-size: 13px; margin-top:8px; }