Theme

Folio is the default theme: warm paper surfaces, deep teal accents, serif headings, flat panels, and a neutral charcoal dark palette. The original default remains available as Classic; the legacy default name is retained as its compatibility alias. Use Hedron(theme='folio', accent='blue') or choose Folio accents in Explorer's Theme Lab; green is the default, with blue, violet, amber, rose, and hex seeds also supported. Production configuration accepts the same theme and accent values.

• ThemePicker — Render an accessible no-JavaScript form for an allowlisted theme and color-mode preference.
• ColorModeToggle — Let users choose light, dark, or system color preference.