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No.223 · Authentication

Liquid Glass Sign-in

A sign-in panel of thick glass over slow colour: its rim bends what's behind it and catches the light nearest your pointer, a glass drop springs between Password and Magic link, and a successful sign-in squashes the panel like a landing drop.

The prompt

Written for the variant you picked above: Dusk

Build a full-bleed sign-in over a slow aurora (four blurred colour blobs drifting on unrelated 17–27s loops) with a fine line-and-dot pattern on top so refraction is visible. The panel (24rem, 30px radius) is glass: a faint white gradient over a smoky tint, backdrop blur and saturation, and layered inset highlights. In Chromium, measure the panel with a ResizeObserver and add an SVG filter used through backdrop-filter: url(#lens): an feImage displacement map (a data-URL SVG that is neutral grey in the middle and ramps to full red/blue offsets in a 20px rim) into feDisplacementMap at scale −56, so only the edge bends the background. Elsewhere it stays frosted glass. A 1.25px rim highlight (radial gradient masked to the border with mask-composite exclude) follows the pointer via --mx/--my. A Password / Magic link radiogroup sits on a recessed track; the selection is a drop of glass that moves on a spring (k 480, c 28) and stretches with speed (scale up to 1.22 × 0.88). Arrow keys switch. The password row opens and closes with a grid-template-rows 0fr → 1fr transition. The submit label ('Sign in' ↔ 'Email me a link' ↔ 'Signing in…') re-mounts as letters that roll up one after another (22ms apart). Validate email, then a minimum password length, with plain-language role=alert errors. Success plays a squash on the panel (scale 1.06 × 0.9 → 0.97 × 1.04 → settle, from the bottom) and swaps in 'Check your inbox' or 'Welcome back' with a glass badge whose icon draws in. Selected variant — Dusk: variant="dusk": aurora blobs of coral #ff7a59, violet #8b5cf6, gold #f5c26b and pink #e0457b over #120b1c.

Notes

Interaction
Move over the panel to slide the rim light; switch Password / Magic link; submit to see the squash and the next step.
Motion
Aurora drifts 17–27s; mode drop on a spring; password row 480ms; label letters roll 460ms, 22ms apart; squash 760ms.
Accessibility
Real labels and autocomplete (email, current-password); the hidden password field is disabled and out of the tab order in link mode. The mode switch is a radiogroup with arrow keys. Errors use role=alert and aria-invalid; the result is role=status. White text keeps contrast through a smoky tint and text shadow. Reduced motion stops the aurora and makes every change instant.
Responsive
The panel is up to 24rem and tightens under 420px; the background fills its container.
On touch
The rim light rests at the top-left; refraction and the spring work the same.

Featured

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151Prompt ComposerA chat composer where attached files tuck into its top edge like tabs in a folder — they rise from behind it when added and sink back when removed. Send turns into stop while the reply streams.157Aura FieldA writing field where colour only exists while the AI is touching your text: the edge becomes a turning band of light and the words are rewritten in place, one by one, out of a soft blur.
205Halftone CTAA tall CTA banner where slow gold paint drifts beneath a fixed halftone grid, visible only through the dots.
212Nocturne Sign-inA single quiet column on near-black with a breathing seam of frost light behind it — email, password, magic link, nothing more.222Sigil Sign-inA split sign-in whose left half grows a geometric mark from your email — the same address always draws the same sigil.
275Voices CarouselA testimonial exhibition: one large quote at a time on frosted glass, crossfading between voices without ever resizing.
279Feral TitleA brutal condensed wordmark — heartbeat in the dark, letters slam in, a gash tears through and the word bleeds.
301 components