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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 motionclick

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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)
  • 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)

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

navigationpilltogglesegmented-controlspringglowdark-ui

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  • Gooey Tab BarPill-shaped tab bar with a vermillion blob that slides between tabs using a spring easing and SVG goo filter for liquid merge effect on dark surface.
  • Radial Fan MenuA core button rotates to an X and fans five glowing stone-toned icon petals outward in a staggered spring arc; auto-cycles open/close as a demo.
  • Slide-in DrawerHamburger icon morphs to an X while a side panel slides in over a dark scrim, revealing four nav items with staggered fade-in animations.
  • Underline FollowA glowing emerald-to-tan gradient underline slides and resizes to follow hovered nav links; wanders idly across links when unhovered.