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No.70 · Cards

Holo Foil Card

A founding-member card printed on holographic foil: tilt it and the rainbow slides across engraved foil lines, strongest at steep angles, glitter catches and goes, and a glare follows the light. Click to turn it over to a signature panel and a foil seal.

The prompt

Written for the variant you picked above: Rainbow

Build a holographic membership card (5:7, 300px, radius 20) inside a button that flips it. 3D: the card has transform-style preserve-3d and rotateX/rotateY from CSS variables; front and back faces are backface-hidden (the back pre-rotated 180°). A rAF spring (k 170, ζ 0.72) eases tilt toward the pointer (±15°) and a second spring (k 90, ζ 0.7) turns the card 0 ↔ 180° on click; the loop stops when settled. The pointer position (0–100%) also drives --px/--py (mirrored on the back), and --hyp (0–1, how steep the tilt is; a registered number). Front layers: the finish's base with a soft light at the pointer; foil — a repeating 115° rainbow gradient at 260% size whose position follows the pointer, colour-dodge blended, masked to fine 135° engraved lines and fading toward the edges, its opacity 0.18 + 0.62·hyp so it blooms at steep angles; glitter — three offset grids of tiny white points that shift at different rates (so they twinkle) masked to an ellipse around the light; content (italic serif logo, number, an emblem, "Founding member", the name in serif, "Since 2026 · Muscat"); the emblem is an SVG mask (a compass ring with two peaks) filled with its own faster rainbow, saturating with the tilt; a glare (radial white at the pointer, overlay); and an inner edge highlight. Back: a dark stripe, a signature panel, terms, and a conic foil seal. The button's label states the name, number and which side is showing (aria-pressed for flipped). A soft floor shadow shrinks while held. Reduced motion: no springs (direct, smaller tilt; the flip is instant). Selected variant — Rainbow: finish="rainbow": a pale pearl base so the rainbow foil reads at full colour (the pearl uses multiply so the foil stays visible on a light card).

Notes

Interaction
Move the pointer over the card to tilt it and move the light; click or press Enter/Space to turn it over.
Motion
Tilt spring k 170 ζ 0.72; flip spring k 90 ζ 0.7; foil, glitter and glare follow the pointer through CSS variables.
Accessibility
A real button with a full label and aria-pressed; the visual layers are aria-hidden. Reduced motion removes the springs.
Responsive
The card is min(300px, 78vw) wide and keeps its 5:7 proportion.
On touch
Drag a finger across it to tilt; tap to flip.

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301 components