Wire-up:
On click, flip aria-selected on each tab and write the
active tab's offsetLeft / offsetWidth onto the pill:
pill.style.transform = `translateX(${tab.offsetLeft}px)`;
pill.style.width = `${tab.offsetWidth}px`;
On first paint and resize, write the same values WITHOUT
a transition (suspend with `transition: none`, force a
reflow, restore) so the pill snaps to position before any
animation can run.
*/
:root {
--tabs-dur: 250ms;
--tabs-ease: cubic-bezier(0.22, 1, 0.36, 1);
--tabs-text-muted: rgba(15, 15, 15, 0.8);
--tabs-text-active: #0f0f0f;
--tabs-bar-bg: #f1f1f1;
--tabs-pill-bg: #ffffff;
}
/* The bar is just a flex container with padding for the pill
to sit inside. Tabs sit on z-index: 1, the pill on z-index: 0,
so labels read above the pill background. */
.t-tabs {
position: relative;
display: inline-flex;
align-items: center;
gap: 3px;
padding: 3px;
border-radius: 48px;
background: var(--tabs-bar-bg);
}
.t-tab {
position: relative;
appearance: none;
border: 0;
background: transparent;
height: 30px;
padding: 4px 12px;
color: var(--tabs-text-muted);
cursor: pointer;
border-radius: 48px;
z-index: 1;
transition: color var(--tabs-dur) var(--tabs-ease);
}
.t-tab:not([aria-selected="true"]):hover,
.t-tab[aria-selected="true"] {
color: var(--tabs-text-active);
}
/* The pill: width + transform are written inline by JS so
the transition tweens between the previous and next
measured positions. */
.t-tabs-pill {
position: absolute;
top: 3px;
left: 0;
height: 30px;
width: 0;
background: var(--tabs-pill-bg);
border-radius: 48px;
transform: translateX(0);
transition:
transform var(--tabs-dur) var(--tabs-ease),
width var(--tabs-dur) var(--tabs-ease);
will-change: transform, width;
z-index: 0;
pointer-events: none;
}
@media (prefers-reduced-motion: reduce) {
.t-tabs-pill, .t-tab { transition: none !important; }
}
/* Transitions.dev — Accordion expand */
/*
Usage:
…
Toggle `data-open` on the item. The panel animates via
grid-template-rows 0fr ↔ 1fr (no JS height measuring) and
the chevron flips vertically (scaleY) from a "v" to a "^".
*/
:root {
--acc-expand: 250ms;
--acc-collapse: 250ms;
--acc-chevron: 250ms;
--acc-ease: cubic-bezier(0.22, 1, 0.36, 1);
}
/* grid-template-rows 0fr → 1fr gives a clean height animation
with no JS measurement; the inner element clips overflow. */
.t-acc-panel {
display: grid;
grid-template-rows: 0fr;
transition: grid-template-rows var(--acc-collapse) var(--acc-ease);
}
.t-acc[data-open="true"] .t-acc-panel {
grid-template-rows: 1fr;
transition: grid-template-rows var(--acc-expand) var(--acc-ease);
}
.t-acc-panel-inner {
overflow: hidden;
opacity: 0;
filter: blur(2px);
transition:
opacity var(--acc-collapse) var(--acc-ease),
filter var(--acc-collapse) var(--acc-ease);
}
.t-acc[data-open="true"] .t-acc-panel-inner {
opacity: 1;
filter: blur(0);
transition:
opacity var(--acc-expand) var(--acc-ease),
filter var(--acc-expand) var(--acc-ease);
}
/* Flip the chevron vertically to turn the "v" into a "^".
scaleY(-1) about the centre passes through a flat line at
the midpoint (same look as a `d:` path morph) but animates
in every browser, unlike CSS `d:` morphing (Chromium only).
The chevron path is symmetric about the 16x16 viewBox
centre, so the flip lands exactly on the "^"; non-scaling
-stroke keeps the stroke width constant through the flip. */
.t-acc-chevron {
display: inline-flex;
transform: scaleY(1);
transform-origin: center;
transition: transform var(--acc-chevron) var(--acc-ease);
}
.t-acc-chevron path { vector-effect: non-scaling-stroke; }
.t-acc[data-open="true"] .t-acc-chevron {
transform: scaleY(-1);
}
@media (prefers-reduced-motion: reduce) {
.t-acc-panel, .t-acc-panel-inner, .t-acc-chevron {
transition: none !important;
}
}
/* Transitions.dev — Error state shake */
/*
Usage:
Please enter a valid email.
Trigger:
- Add `.is-error` to .t-input-wrap and .t-input. Your
own border-color rules drive the visible color; this
stylesheet only owns the tween.
- Restart the shake by removing `.is-shaking` from
.t-input, forcing a reflow, then re-adding it.
- Optional: after --revert-hold ms, drop both
`.is-error` classes so border + message fade back
to neutral over --revert-dur.
Per-segment ease: each keyframe stop carries its own
animation-timing-function so each leg follows the Figma
cubic-bezier curve independently.
*/
:root {
--shake-distance: 6px;
--shake-overshoot: 4px;
--shake-dur-a: 80ms;
--shake-dur-b: 60ms;
--shake-ease: cubic-bezier(0.22, 1, 0.36, 1);
--revert-hold: 3000ms;
--revert-dur: 280ms;
}
/* Border-color tween. Define your input's default / focused
/ error border-color in your own component CSS — this rule
only owns the interpolation. Use a constant border-width
across states so the tween never shifts inner content. */
.t-input {
transition: border-color 150ms ease-out;
will-change: transform;
}
.t-input.is-error {
/* Error border auto-reverts on the hold timer, so the
fade-out uses the slower revert duration (matches the
message fade). */
transition: border-color var(--revert-dur, 280ms) ease-out;
}
/* Error message reveal. Visibility is delayed by --revert-dur
on hide so the message stays painted for the full opacity
fade-out. Entering .is-error drops the delay to 0 so the
message becomes visible immediately. */
.t-error-msg {
opacity: 0;
visibility: hidden;
transition:
opacity var(--revert-dur, 280ms) ease-out,
visibility 0s linear var(--revert-dur, 280ms);
}
.t-input-wrap.is-error .t-error-msg {
opacity: 1;
visibility: visible;
transition:
opacity var(--revert-dur, 280ms) ease-out,
visibility 0s linear 0s;
}
/* Multi-segment keyframe with per-stop easing so each leg
of the shake follows its own cubic-bezier independently.
%-stops are cumulative durations as a fraction of the
total (80, 60, 80, 60 = 280ms): 28.57%, 57.14%, 78.57%,
100%. Recompute if any segment duration changes. */
.t-input.is-shaking {
animation: t-input-shake calc(
var(--shake-dur-a) * 2 + var(--shake-dur-b) * 2
) linear;
}
@keyframes t-input-shake {
0% { transform: translateX(0); animation-timing-function: var(--shake-ease); }
28.57% { transform: translateX(var(--shake-distance)); animation-timing-function: var(--shake-ease); }
57.14% { transform: translateX(calc(var(--shake-distance) * -1)); animation-timing-function: var(--shake-ease); }
78.57% { transform: translateX(var(--shake-overshoot)); animation-timing-function: var(--shake-ease); }
100% { transform: translateX(0); }
}
@media (prefers-reduced-motion: reduce) {
.t-input { animation: none !important; transform: none !important; }
}
/* Transitions.dev — Success check */
/*
Usage:
Trigger:
- Cold load is data-state="out" (opacity 0; no animation).
- Show: set data-state="in" (fade + rotate + blur + Y-bob
+ path draw run in parallel).
Snippet covers the appear transition only — bring your own
hide behavior (e.g. unmount, opacity:0, or a custom exit).
*/
:root {
--check-opacity-dur: 500ms;
--check-rotate-dur: 500ms;
--check-rotate-from: 80deg;
--check-bob-dur: 500ms;
--check-y-amount: 40px;
--check-blur-dur: 500ms;
--check-blur-from: 10px;
--check-path-dur: 500ms;
--check-path-delay: 80ms;
--check-ease-out: cubic-bezier(0.22, 1, 0.36, 1);
--check-ease-opacity: cubic-bezier(0.22, 1, 0.36, 1);
--check-ease-rotate: cubic-bezier(0.22, 1, 0.36, 1);
--check-ease-bob: cubic-bezier(0.34, 1.35, 0.64, 1);
--check-ease-path: cubic-bezier(0.22, 1, 0.36, 1);
}
/* Wrapper drives the appear animation; it doesn't own any
sizing or color so you can drop in any icon. */
.t-success-check {
display: inline-block;
transform-origin: center;
opacity: 0;
will-change: transform, opacity, filter;
}
/* overflow: visible keeps the stroke from clipping while it
draws; display: block kills the inline whitespace under SVGs. */
.t-success-check svg { display: block; overflow: visible; }
/* Stroke-draw setup. Replace 20 with the result of
path.getTotalLength() for your path; round caps mean any
sub-pixel overshoot is invisible. */
.t-success-check svg path {
stroke-dasharray: 20;
stroke-dashoffset: 20;
}
.t-success-check[data-state="in"] {
animation:
t-check-fade var(--check-opacity-dur) var(--check-ease-opacity) forwards,
t-check-rotate var(--check-rotate-dur) var(--check-ease-rotate) forwards,
t-check-blur var(--check-blur-dur) var(--check-ease-out) forwards,
t-check-bob var(--check-bob-dur) var(--check-ease-bob) forwards;
}
.t-success-check[data-state="in"] svg path {
animation: t-check-draw var(--check-path-dur) var(--check-ease-path) var(--check-path-delay, 0ms) forwards;
}
@keyframes t-check-fade { from { opacity: 0; } to { opacity: 1; } }
@keyframes t-check-rotate {
from { transform: rotate(var(--check-rotate-from)); }
to { transform: rotate(0deg); }
}
@keyframes t-check-blur {
from { filter: blur(var(--check-blur-from)); }
to { filter: blur(0); }
}
@keyframes t-check-bob {
from { translate: 0 var(--check-y-amount); }
to { translate: 0 0; }
}
@keyframes t-check-draw { to { stroke-dashoffset: 0; } }
@media (prefers-reduced-motion: reduce) {
.t-success-check { animation: none !important; opacity: 1; }
.t-success-check svg path { animation: none !important; stroke-dashoffset: 0 !important; }
}