Animations

Loading & progress

Indefinite work (spinner, skeleton, shimmering label) loops forever because there is nothing else to signal "still going". Determinate work (progress, gauge, funnel) never loops — it interpolates its width or position whenever the underlying value changes, which is a plain CSS transition, not a keyframe.

Streaming text & carets

The caret is solid while tokens are landing and only starts blinking once the stream goes quiet — a caret that blinks mid-stream reads as a stall, so StreamingText never applies the blink class during an active stream.

Thinking & reasoning

Live-looping so every transition in the block fires on its own: entrance fade, the stream pushing itself up from the bottom edge while collapsed, and the fold into a "Thought for Ns" summary with its chevron rotate.

Orb — 25 status motions

Five families, five variants each. The geometry is computed once in Orb.tsx and handed to CSS as custom properties, so every keyframe here only interpolates between positions — that split is what keeps 25 distinct motions on one small stylesheet. All of them draw in currentColor and stop outright under reduced motion.

To-do list — entrance, counters & progress ring

Four motions in one component: items stagger in on mount (sc-todo-in, 50ms per item), the header's done/total counter rolls digit by digit, the header's dotted ring fills as a @property-animated conic gradient, and the active item's label shimmers. Click the header to see the list collapse — height animates via grid-template-rows.

Plan progress — the advancing thread

Run-scoped ambient state, so unlike TodoList it is meant to live outside the transcript — a rail, a header, a drawer. The component therefore ships no position and no width: it fills whatever box the host gives it, and owns density instead. The same instance is rendered twice below, in a 260px rail and full width; the narrow one compacts on its own measurement via @container, not the window.

Five new motions telling one idea — a thread advancing downward. The three that mark a state change are transitions, not keyframes, so they fire only when a status actually flips and stay silent on mount: a plan that arrives already half-finished should not replay its own history. Drive it by hand below and watch each one fire.

Enter / exit fades

The same sc-fade-in keyframe — plain opacity 0→1 — reused at four different durations depending on how transient the thing is: a dropdown menu appears almost instantly, an attachment chip a little slower, so the eye can track what just got added.

Toast — rise on enter

A toast is for something that already happened and is over — it self-dismisses, so unlike everything above it needs no replay button: firing another one is the replay.

Micro-interactions

Hover, focus and pressed-state transitions — short (120–140ms) so they read as instant feedback rather than motion in their own right. Try them directly.

prefers-reduced-motion