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Sliding Pill

A 3-segment Day/Week/Month toggle where a glowing translucent pill slides between options with a spring bounce on a dark rounded bar.

csslight complexitysubtle motionclickmobile-ready

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When to use it

Calendar views, date-range pickers, or any 2-4 option segmented control on dark UI surfaces.

When not to

Light backgrounds (colors hardcoded for dark surface). More than 4-5 options — pill width math gets cramped.

Working with an AI agent

Every component ships agent-ready metadata. An example instruction for this one:

Change the three labels to 'Hours', 'Days', 'Weeks' and update the accent glow color from emerald to amber by replacing rgba(43,171,107,0.5) with rgba(251,191,36,0.5). Theme: dark tokens live in :root, the light variant in :root[data-theme="light"]; ?theme=light or a {type:'forever:theme'} postMessage switches at runtime.

Safe to edit

button labels (Day/Week/Month text)
spring easing curve (--ease-spring cubic-bezier)
glide transition duration (440ms)
accent glow color (--glow-cyan / --border-glow)
auto-cycle interval (1700ms) Autonomous preview ends at first deliberate input and never resumes.
padding and font size
theme tokens (:root dark defaults + [data-theme=light] overrides)

Keep intact

requestAnimationFrame initial move() call (sizes glide on load)
visibilitychange stop/loop pause pattern
prefers-reduced-motion guard on auto-cycle loop
theme hook (?theme= bootstrap + forever:theme message listener + theme tokens)
demo-v1 preview lifecycle: initialize demoEnabled from window.__foreverPreview and stop attract work on the window forever:interactive event; retain manual feedback, settling, cleanup and explicit sessions

Known limitations

Auto-cycles by default — remove loop() call and stop() handler before shipping in production
Background and colors hardcoded for dark surfaces only
No aria-pressed or role=tablist semantics for screen readers
State remains local to each mounted instance; format/theme remount preserves takeover, not component values.

navigationpilltogglesegmented-controlspringglowdark-ui

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