- Add a theme toggle to the gate (sun/moon ghost button next to the help
button); it switches instantly and persists to localStorage.
- Strengthen the corner glows so the stage reads atmospheric in both themes
(bigger, slightly stronger radial gradients behind the card).
- Center the logo, heading, subtitle and footnote inside the card.
- Dark mode: replace the solid white logo tile with a subtle raised tile
(thin border, light snowflake); make the card only slightly lighter than
the near-black page with a low-opacity border and soft shadow.
- Disabled Continue keeps the primary fill at ~45% opacity with a crisp
label instead of a faded muddy one; fully solid once text is entered.
- Bigger 36px corner buttons and a visible "How do I get a key?" text link
under the input that opens the same modal.
- Shorten and balance the reassurance line.
- Help modal: step circles aligned to the first text line, emphasised
free-tier callout with a check icon, underlined links with an
external-link icon, muted medium-weight UI labels, 36px close button
aligned to the title.
- Gate test extended to 44 checks (theme toggle, text link, modal polish).