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No.160 · AI & Chat

Thinking Trace

A reasoning status that shows its work without shouting: the current step shimmers across its own words with a live timer, and the line expands into the steps already done, each with its duration.

The prompt

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

Design the 'thinking' state of an AI reply as a quiet one-line status that is also a log. The line has a breathing accent dot (scale pulse plus an expanding ring), the current step's text, a tabular mono timer and a chevron. The current step's text carries its own shimmer — a 100° gradient (muted → ink → muted) clipped to the letters with background-clip: text, sliding across every 1.8s — and each new step enters with a 4px rise. The whole line is a disclosure button: expanding (grid-template-rows 0fr → 1fr, 480ms) reveals the steps already finished on a thin vertical thread, each with a dot and its duration in mono, plus the pending step highlighted in accent. When everything finishes, the dot settles into a small still grey point and the line becomes 'Thought for 6s'. Steps and durations are data; the demo loops. Paper and night themes.

Notes

Interaction
Click (or Enter/Space) the status line to show or hide the finished steps.
Motion
1.8s text shimmer, 1.6s breathing dot with ring, 460ms step entry, 480ms disclosure; everything settles when done.
Accessibility
The line is a real button with aria-expanded/aria-controls; the current step and completion are announced politely; reduced motion shows the final state without shimmer or pulses.
Responsive
Fluid to 34rem; long step names truncate with an ellipsis on the line and wrap in the log.
On touch
Tap the line to toggle the log.

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