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No.68 · Cards

Tidefill Card

A savings-goal card that fills with water to the share you've saved; everything printed on it inverts exactly along the rolling wave, and adding money raises the tide.

The prompt

The design brief behind this component — reuse it to regenerate, remix, or explain it.

Build a savings-goal card (23rem, 24px radius) that is its own progress bar. Register --p (number), --x and --wave-height (lengths) with @property. Measure the card's height with a ResizeObserver into --h; the water's surface sits at --top = (1 − p) × h. Render the content twice in identical layouts: once on the card and once in a full-size 'water' layer (deep teal on paper, frost on night) whose colour variables are inverted. Mask the water layer with two images: a seamless wave (an SVG data URL, 160px period, repeat-x) sized 160px × --wave-height and positioned at (--x, --top − wave-height), plus a solid gradient sized 100% × (h − top) pinned to the bottom. Animate --x from 0 to 160px every 3.2s so the surface rolls; because the inverted print is inside the masked layer, the words invert exactly along the wave. A paler second swell sits just behind, moving the other way. Hover raises the swell (12 → 20px). 'Add OMR 50' raises --p with a slight overshoot (1.2s, cubic-bezier(0.34,1.32,0.64,1)) while the amount rolls digit by digit (reels keyed from the right, staggered 40ms). At 100% the wave settles flat and the note reads 'Goal reached. Mabrook!'.

Notes

Interaction
Hover to raise the swell; press Add to put money in and watch the tide rise.
Motion
Surface rolls every 3.2s; level change 1.2s with overshoot; digits roll 900ms staggered; swell height 700ms.
Accessibility
The real content is read once; the water copy is aria-hidden and inert. A progressbar exposes saved / goal as '78% saved', and the remaining amount is announced politely after each addition. The add button disables at the goal. Reduced motion stops the roll and jumps levels.
Responsive
Up to 23rem wide; the mask is recomputed from the measured height, so it works at any size.
On touch
The swell stays at its resting height; tap Add to raise the tide.

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301 components