AI CSS Animations

Thought For Reasoning Disclosure

A collapsed Thought for 12s row whose chevron turns as the reasoning panel opens, the muted thoughts blur in beside a hairline rule, and the answer below slides down to make room.

Also known as: thought for seconds animation, reasoning dropdown ui, collapsible thinking block, chain of thought ui.

Thought for 12s

Two requests can both read count = 4 before either one writes, so the limit check passes twice. A lock would work, but a conditional UPDATE is simpler.

Move the check into the UPDATE itself, so the database settles the race:

HTML

<div class="aia-thought-for-disclosure" role="status" aria-label="Thought for 12 seconds">
  <div class="aia-thought-for-disclosure-head">
    <svg class="aia-thought-for-disclosure-clock" viewBox="0 0 24 24" aria-hidden="true"><circle cx="12" cy="12" r="8.5"/><path d="M12 7.5V12l3 2"/></svg>
    <span>Thought for 12s</span>
    <svg class="aia-thought-for-disclosure-chev" viewBox="0 0 24 24" aria-hidden="true"><path d="m9.5 6 6 6-6 6"/></svg>
  </div>
  <div class="aia-thought-for-disclosure-panel">
    <p class="aia-thought-for-disclosure-body">Two requests can both read count = 4 before either one writes, so the limit check passes twice. A lock would work, but a conditional UPDATE is simpler.</p>
  </div>
  <p class="aia-thought-for-disclosure-answer">Move the check into the UPDATE itself, so the database settles the race:</p>
</div>

CSS

.aia-thought-for-disclosure {
  --c: var(--aia-color, #7c5cff);
  font-size: var(--aia-size, 16px);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.4;
  width: 24em;
  max-width: 100%;
  height: 9.5em;
}
.aia-thought-for-disclosure-head {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  font-size: 0.95em;
  font-weight: 500;
  animation: aia-thought-for-disclosure-head 9s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}
.aia-thought-for-disclosure-head svg {
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.aia-thought-for-disclosure-clock {
  width: 1.1em;
  height: 1.1em;
}
.aia-thought-for-disclosure-chev {
  width: 1em;
  height: 1em;
  animation: aia-thought-for-disclosure-chev 9s infinite;
}
.aia-thought-for-disclosure-panel {
  overflow: hidden;
  max-height: 0;
  animation: aia-thought-for-disclosure-open 9s infinite;
}
.aia-thought-for-disclosure-body {
  margin: 0.6em 0 0.3em 0.55em;
  padding-left: 0.9em;
  border-left: 1px solid color-mix(in srgb, currentColor 18%, transparent);
  font-size: 0.9em;
  line-height: 1.55;
  color: color-mix(in srgb, currentColor 58%, transparent);
  animation: aia-thought-for-disclosure-body 9s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}
.aia-thought-for-disclosure-answer {
  margin: 0.55em 0 0;
  line-height: 1.5;
}
@keyframes aia-thought-for-disclosure-head {
  0%, 12%, 88%, 100% { opacity: 0.55; }
  20%, 78%           { opacity: 0.9; }
}
@keyframes aia-thought-for-disclosure-chev {
  0%, 12% { transform: rotate(0deg); animation-timing-function: cubic-bezier(0.3, 1.5, 0.5, 1); }
  20%, 76% { transform: rotate(90deg); animation-timing-function: cubic-bezier(0.4, 0, 0.2, 1); }
  84%, 100% { transform: rotate(0deg); }
}
@keyframes aia-thought-for-disclosure-open {
  0%, 12% { max-height: 0; animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1); }
  26%, 76% { max-height: 6.5em; animation-timing-function: cubic-bezier(0.6, 0, 0.3, 1); }
  88%, 100% { max-height: 0; }
}
@keyframes aia-thought-for-disclosure-body {
  0%, 15%   { opacity: 0; transform: translateY(-0.4em); filter: blur(0.15em); }
  30%, 72%  { opacity: 1; transform: none; filter: blur(0); }
  80%, 100% { opacity: 0; transform: translateY(-0.2em); filter: blur(0.15em); }
}
@media (prefers-reduced-motion: reduce) {
  .aia-thought-for-disclosure-head,
  .aia-thought-for-disclosure-chev,
  .aia-thought-for-disclosure-panel,
  .aia-thought-for-disclosure-body { animation: none; }
  .aia-thought-for-disclosure-chev { transform: rotate(90deg); }
  .aia-thought-for-disclosure-panel { max-height: none; }
}

@media (prefers-reduced-motion: reduce) {
  .aia-thought-for-disclosure, .aia-thought-for-disclosure *, .aia-thought-for-disclosure::before, .aia-thought-for-disclosure::after, .aia-thought-for-disclosure *::before, .aia-thought-for-disclosure *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

Customizing this snippet

  • Color: set --aia-color on the element or a parent. Currently previewing #3b82f6.
  • Base size: set --aia-size. Every other dimension is in em, so the whole thing scales together. Currently previewing 16px.
  • Speed: change the duration on the transition or animation shorthand. Staggered delays are relative, so they keep their rhythm.
  • Reduced motion: the rule at the end of the CSS turns the motion off for people who asked their OS for less of it. Keep it.

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