> ## Documentation Index
> Fetch the complete documentation index at: https://hyperframes-feat-ad94-tune-scroll-cue.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Motion Blur

> After Effects-style motion blur — integrates each element over a shutter window (shutter angle, phase, samples per frame) by sampling the GSAP timeline at sub-frame times and averaging equal-weight additive copies of the element along its real trajectory, so translation, scale, rotation, 3D rotation and skew all drive the smear

export const InstallCommand = ({command, item}) => {
  const [copied, setCopied] = React.useState(false);
  const [tuned, setTuned] = React.useState("");
  React.useEffect(() => {
    if (!item) return;
    const read = () => {
      try {
        const raw = new URLSearchParams(window.location.search).get(`vars-${item}`);
        if (!raw) return setTuned("");
        const parsed = JSON.parse(raw);
        if (!parsed || typeof parsed !== "object" || Array.isArray(parsed)) return setTuned("");
        if (Object.keys(parsed).length === 0) return setTuned("");
        setTuned(` --vars '${JSON.stringify(parsed)}'`);
      } catch {
        setTuned("");
      }
    };
    read();
    window.addEventListener("hf-vars-changed", read);
    window.addEventListener("popstate", read);
    return () => {
      window.removeEventListener("hf-vars-changed", read);
      window.removeEventListener("popstate", read);
    };
  }, [item]);
  const fullCommand = `${command}${tuned}`;
  const copy = async () => {
    try {
      if (navigator.clipboard && window.isSecureContext) {
        await navigator.clipboard.writeText(fullCommand);
      } else {
        const previous = document.activeElement;
        const scratch = document.createElement("textarea");
        scratch.value = fullCommand;
        scratch.setAttribute("readonly", "");
        scratch.style.position = "fixed";
        scratch.style.opacity = "0";
        document.body.appendChild(scratch);
        scratch.select();
        document.execCommand("copy");
        document.body.removeChild(scratch);
        previous?.focus?.();
      }
      setCopied(true);
      setTimeout(() => setCopied(false), 2000);
    } catch {}
  };
  return <div className="hf-install-command not-prose my-4 flex items-stretch overflow-hidden rounded-xl border border-zinc-200 bg-zinc-50 dark:border-zinc-800 dark:bg-zinc-900">
      <code className="flex-1 overflow-x-auto whitespace-nowrap border-r border-zinc-200 px-4 py-3 font-mono text-sm text-zinc-800 dark:border-zinc-800 dark:text-zinc-100">
        {fullCommand}
      </code>
      <button type="button" onClick={copy} data-copied={copied ? "true" : "false"} aria-label={`Copy ${command} to the clipboard`} className="hf-install-copy">
        <svg className="hf-install-copy-clipboard" xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 18 18" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round" aria-hidden="true">
          <path d="M14.25 5.25H7.25C6.14543 5.25 5.25 6.14543 5.25 7.25V14.25C5.25 15.3546 6.14543 16.25 7.25 16.25H14.25C15.3546 16.25 16.25 15.3546 16.25 14.25V7.25C16.25 6.14543 15.3546 5.25 14.25 5.25Z" />
          <path d="M2.80103 11.998L1.77203 5.07397C1.61003 3.98097 2.36403 2.96397 3.45603 2.80197L10.38 1.77297C11.313 1.63397 12.19 2.16297 12.528 3.00097" />
        </svg>
        <svg className="hf-install-copy-check" xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 18 18" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" aria-hidden="true">
          <path d="M2.75 9.5L6.5 13.25L15.25 4.5" />
        </svg>
      </button>
      <span className="hf-install-copy-status" role="status" aria-live="polite">
        {copied ? "Copied" : ""}
      </span>
    </div>;
};

export const CatalogSlot = ({slot, children}) => <div data-slot={slot} className="prose prose-gray dark:prose-invert">
    {children}
  </div>;

export const CatalogDetail = ({previewSrc, compositionId, compositionSrc, variables = [], title, description, meta = {}, about, attribution, rawUrl, video, poster, webgpu, needsFlag, hasCode, children}) => {
  const SHIKI = {
    punct: {
      color: "rgb(31, 35, 40)",
      "--shiki-dark": "#808080"
    },
    tag: {
      color: "rgb(17, 99, 41)",
      "--shiki-dark": "#569CD6"
    },
    attr: {
      color: "rgb(5, 80, 174)",
      "--shiki-dark": "#9CDCFE"
    },
    equals: {
      color: "rgb(31, 35, 40)",
      "--shiki-dark": "#D4D4D4"
    },
    value: {
      color: "rgb(10, 48, 105)",
      "--shiki-dark": "#CE9178"
    }
  };
  const CSS = `
.hf-ve {
  --ve-fg: #18181b;
  --ve-muted: #71717a;
  --ve-line: #e4e4e7;
  --ve-surface: #ffffff;
  --ve-sunken: #fafafa;
  --ve-hover: #f4f4f5;
  --ve-on-bg: #18181b;
  --ve-on-fg: #ffffff;
  --ve-ring: rgba(24, 24, 27, 0.14);
  --ve-danger: #b42318;
}
:where(html.dark) .hf-ve {
  --ve-fg: #f4f4f5;
  --ve-muted: #a1a1aa;
  --ve-line: #27272a;
  --ve-surface: #18181b;
  --ve-sunken: #131316;
  --ve-hover: #27272a;
  --ve-on-bg: #f4f4f5;
  --ve-on-fg: #18181b;
  --ve-ring: rgba(244, 244, 245, 0.2);
  --ve-danger: #ff9d95;
}

.hf-ve-tabs {
  display: inline-flex;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--ve-line);
  border-radius: 9999px;
  background: var(--ve-sunken);
}
.hf-ve-tab {
  padding: 4px 12px;
  border-radius: 9999px;
  font-size: 12px;
  font-weight: 500;
  color: var(--ve-muted);
  background: transparent;
}
.hf-ve-tab[data-on="true"] {
  color: var(--ve-fg);
  background: var(--ve-hover);
}
.hf-ve-tab:focus:not(:focus-visible) { outline: none; box-shadow: none; }
.hf-ve-tab:hover:not([data-on="true"]) { color: var(--ve-fg); }

/* Not a grid. A grid row is as tall as its tallest cell, so a five-line snippet
   sat in the preview's 16:9 box with 300px of dead area under it. The inactive
   pane is taken out of flow instead — and stretches left/right rather than to
   inset 0, so the iframe keeps its own height. An iframe resized on every tab
   switch reflows the composition running inside it. */
.hf-ve-frame { position: relative; }
.hf-ve-cell { min-width: 0; }
.hf-ve-cell[data-on="false"] {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  visibility: hidden;
  pointer-events: none;
}
.hf-ve-preview {
  overflow: hidden;
  border: 1px solid var(--ve-line);
  border-radius: 12px;
}
/* CodeBlock carries the page margins (mt-5 mb-8) that separate it from prose,
   which is dead space inside a tab. Element plus two classes out-specifies a
   Tailwind utility without !important. */
.hf-ve-cell > div.code-block { margin: 0; }
/* The snippet wraps; the source does not.
   A value the reader has to read in full should not hide half of itself off the
   right edge, so the snippet pane wraps — what \`\`\`html wrap does for a fence.
   The width reset is the half that matters: the block's own <code> is sized to
   max-content, and content that never meets an edge never wraps.
   Source is left to scroll sideways like every other code block on the site.
   Wrapping it breaks its indentation, and a comment paragraph re-flowed to a
   narrow column reads worse than one the reader can scroll. */
.hf-ve-snippet .shiki,
.hf-ve-snippet .shiki code {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
/* A composition source runs to several hundred lines, and an un-capped tab
   pushes the Customize panel off the screen. The cap goes on the scroll box
   rather than the block, so the filename and its copy button stay put; and it
   is a max-height, so a short source still hugs its own content and the dead
   area under it stays gone. */
.hf-ve-cell .code-block pre {
  max-height: 460px;
  overflow: auto;
}
/* Four classes deep because the rule being answered is three
   (\`html:not(.dark) .codeblock-light pre.shiki code\`), and a shorter selector
   silently loses to it. */
.hf-ve .hf-ve-snippet .code-block pre.shiki code {
  width: auto;
  min-width: 0;
}

.hf-ve-panel {
  margin-top: 12px;
  border: 1px solid var(--ve-line);
  border-radius: 12px;
}
.hf-ve-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  border-bottom: 1px solid var(--ve-line);
}
.hf-ve-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ve-muted);
}
.hf-ve-grid {
  display: grid;
  gap: 16px 28px;
  padding: 16px;
}
@media (min-width: 640px) {
  .hf-ve-grid { grid-template-columns: 1fr 1fr; }
}
.hf-ve-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
}
.hf-ve-label { font-size: 14px; font-weight: 500; color: var(--ve-fg); }
.hf-ve-value {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--ve-muted);
}
.hf-ve-desc {
  margin: 6px 0 0;
  font-size: 12px;
  line-height: 1.45;
  color: var(--ve-muted);
}

.hf-ve-btn {
  padding: 4px 10px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 500;
  color: var(--ve-muted);
  background: transparent;
}
.hf-ve-btn:hover:not(:disabled) { color: var(--ve-fg); background: var(--ve-hover); }
.hf-ve-btn:disabled { opacity: 0.4; cursor: default; }

.hf-ve-field {
  width: 100%;
  height: 36px;
  padding: 0 12px;
  border: 1px solid var(--ve-line);
  border-radius: 8px;
  font-size: 14px;
  line-height: 1.4;
  color: var(--ve-fg);
  background: var(--ve-surface);
}
.hf-ve-field::placeholder { color: var(--ve-muted); }
.hf-ve-mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; }

/* Focus, once, for every control here. A ring outside the border rather than a
   border colour alone: the border already carries the resting state, so
   recolouring it is a change a reader can miss. Nothing shifts, because the
   ring is a shadow. :focus-visible, so a pointer click does not light it up. */
.hf-ve-field:focus-visible,
.hf-ve-seg-btn:focus-visible,
.hf-ve-tab:focus-visible,
.hf-ve-btn:focus-visible,
.hf-ve-switch:focus-visible,
.hf-ve-swatch:focus-visible {
  outline: none;
  border-color: var(--ve-on-bg);
  box-shadow: 0 0 0 3px var(--ve-ring);
}
/* A range is a track, and ringing the track rings a pill the width of the
   panel. The thumb is the part that has focus, so the thumb is what says so. */
.hf-ve-range:focus-visible { outline: none; }
.hf-ve-range:focus-visible::-webkit-slider-thumb { box-shadow: 0 0 0 4px var(--ve-ring); }
.hf-ve-range:focus-visible::-moz-range-thumb { box-shadow: 0 0 0 4px var(--ve-ring); }
/* Safari still fires :focus for a click on a button, so the pair is kept. */
.hf-ve-field:focus { outline: none; border-color: var(--ve-on-bg); }

/* The enum branch above sends anything past four options here. No shipped item
   does today (every enum in the registry has two to four), so this is styled to
   the point of not looking foreign and no further — the chevron is one neutral
   grey rather than a per-theme pair, because a data URI cannot read a token. */
.hf-ve-select {
  appearance: none;
  -webkit-appearance: none;
  padding-right: 34px;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='none' stroke='%2389898f' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m4 6 4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  cursor: pointer;
}

.hf-ve-seg {
  display: flex;
  padding: 2px;
  border: 1px solid var(--ve-line);
  border-radius: 8px;
}
.hf-ve-seg-btn {
  flex: 1;
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
  color: var(--ve-muted);
  background: transparent;
}
.hf-ve-seg-btn:hover:not([data-on="true"]) { color: var(--ve-fg); background: var(--ve-hover); }
.hf-ve-seg-btn[data-on="true"] { color: var(--ve-on-fg); background: var(--ve-on-bg); }

/* A range, rebuilt. \`accent-color\` alone leaves the platform's hairline track,
   which reads as an unstyled browser part next to everything else here. Each
   engine names its parts differently and shares none of them, so the same
   track and thumb are written twice; a selector either engine cannot parse
   drops the whole rule, which is why they are never grouped. */
.hf-ve-range {
  width: 100%;
  height: 20px;
  appearance: none;
  -webkit-appearance: none;
  border: 0;
  border-radius: 9999px;
  background: transparent;
  cursor: pointer;
}
/* --ve-fill is set per render: painting progress on a native track means a
   two-stop gradient, and only the component knows where the value sits. */
.hf-ve-range::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 9999px;
  background: linear-gradient(
    to right,
    var(--ve-on-bg) var(--ve-fill, 0%),
    var(--ve-line) var(--ve-fill, 0%)
  );
}
.hf-ve-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  margin-top: -5px;
  border: 2px solid var(--ve-on-bg);
  border-radius: 9999px;
  background: var(--ve-surface);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.14);
}
.hf-ve-range::-moz-range-track { height: 6px; border-radius: 9999px; background: var(--ve-line); }
.hf-ve-range::-moz-range-progress { height: 6px; border-radius: 9999px; background: var(--ve-on-bg); }
.hf-ve-range::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border: 2px solid var(--ve-on-bg);
  border-radius: 9999px;
  background: var(--ve-surface);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.14);
}
/* Hover reads on the part being aimed at rather than on the whole strip: a
   track that darkens under the pointer says "click me and the thumb comes
   here", which is what a native range actually does. */
.hf-ve-range:hover::-webkit-slider-thumb { border-color: var(--ve-fg); }
.hf-ve-range:hover::-moz-range-thumb { border-color: var(--ve-fg); }

/* The number control, and the three things it used to leave unsaid.
 *
 * It could not say where the range ends, so a reader dragging \`stroke_width\`
 * had no idea whether 12 was nearly nothing or nearly everything: the ends now
 * carry min and max.
 *
 * It could not say where the author left the knob, which is the one reference
 * point a panel built around deviating from the author's choice needs: a mark
 * on the track is the default, and a double click puts the value back on it.
 *
 * And it printed the value in the label row, a fixed distance from a thumb that
 * moves, so reading a drag meant looking in two places at once. The value rides
 * the thumb instead.
 *
 * Still a real <input type="range">. Every custom slider on the web reimplements
 * keyboard stepping, touch, and the screen-reader contract, and most of them do
 * one of the three badly; none of what is added here needed the element
 * replaced. Nothing moves that a finger is not moving: the value tracks the
 * pointer because it is the pointer's own readout, and the only transition is
 * the colour one every other control here shares. */
.hf-ve-slider {
  display: grid;
  gap: 1px;
}
.hf-ve-ruler {
  position: relative;
  height: 17px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  line-height: 17px;
  color: var(--ve-muted);
}
.hf-ve-bound {
  position: absolute;
  top: 0;
}
.hf-ve-bound[data-end="min"] { left: 0; }
.hf-ve-bound[data-end="max"] { right: 0; }
/* An end steps aside rather than being overprinted by the value arriving on
   top of it. Visibility, not opacity: there is no fade here, the label is
   either the thing being read or it is out of the way. */
.hf-ve-ruler[data-near="min"] .hf-ve-bound[data-end="min"],
.hf-ve-ruler[data-near="max"] .hf-ve-bound[data-end="max"] {
  visibility: hidden;
}
/* translateX is centring, not motion: the readout is as wide as its own digits
   and has to hang half of that either side of the thumb. */
.hf-ve-readout {
  position: absolute;
  top: 0;
  left: calc(var(--ve-fill, 0%) + var(--ve-fill-nudge, 0px));
  transform: translateX(-50%);
  color: var(--ve-fg);
  font-weight: 600;
  white-space: nowrap;
}
.hf-ve-track {
  position: relative;
  display: block;
}
.hf-ve-range { display: block; }
.hf-ve-default {
  position: absolute;
  top: 5px;
  left: calc(var(--ve-default, 50%) + var(--ve-default-nudge, 0px));
  width: 2px;
  height: 10px;
  margin-left: -1px;
  border-radius: 1px;
  background: var(--ve-muted);
  pointer-events: none;
}

/* A switch, for the boolean type. It used to fall through to the text input at
   the end of control(), which asked the reader to type the word "true". */
.hf-ve-switch {
  display: inline-flex;
  align-items: center;
  width: 40px;
  height: 24px;
  padding: 2px;
  border: 1px solid var(--ve-line);
  border-radius: 9999px;
  background: var(--ve-sunken);
  cursor: pointer;
}
.hf-ve-switch[data-on="true"] { border-color: var(--ve-on-bg); background: var(--ve-on-bg); }
.hf-ve-switch-dot {
  width: 18px;
  height: 18px;
  border-radius: 9999px;
  background: var(--ve-surface);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.18);
}
.hf-ve-switch[data-on="true"] .hf-ve-switch-dot {
  background: var(--ve-on-fg);
  transform: translateX(16px);
}

/* The SVG import control: the same text field, with a way to fill it.
 *
 * The whole block is the drop target, not just the field, so a file let go over
 * the button lands too. It says so by taking the same border colour a focused
 * field takes, which is the one feedback channel this panel has left.
 *
 * A bare <input type="file"> is unlabelled, unstyleable and reads as "No file
 * chosen" next to controls that carry their own value, so the real input is
 * taken out of the layout and the tab order and a button in front of it is what
 * a reader sees and what a keyboard reaches. Hidden with size and opacity
 * rather than display:none, because an input that is not rendered at all is one
 * some browsers decline to open a picker for. */
.hf-ve-drop {
  display: grid;
  gap: 8px;
}
.hf-ve-drop[data-over="true"] .hf-ve-dropzone {
  border-color: var(--ve-on-bg);
  border-style: solid;
}

/* The import is the action almost everyone wants: a reader arrives with a
   shape, not with path data. A dashed target reads as "put a file here" on
   sight, where a button beneath a field of coordinates read as an afterthought
   to the coordinates. */
.hf-ve-dropzone {
  display: grid;
  justify-items: center;
  gap: 6px;
  padding: 18px 12px;
  border: 1px dashed var(--ve-line);
  border-radius: 10px;
  background: var(--ve-surface);
  text-align: center;
}
.hf-ve-dropzone .hf-ve-btn {
  padding: 7px 16px;
  font-size: 13px;
  color: var(--ve-fg);
  border-color: var(--ve-line);
  background: var(--ve-bg);
}
.hf-ve-dropzone .hf-ve-btn:hover:not(:disabled) { background: var(--ve-hover); }

/* Path data stays reachable, but a reader has to ask for it. A native details
   element rather than our own toggle, so it opens with the keyboard and is
   announced as expandable without any wiring. */
.hf-ve-advanced > summary {
  font-size: 12px;
  color: var(--ve-muted);
  cursor: pointer;
  list-style: none;
  padding: 2px 0;
}
.hf-ve-advanced > summary::-webkit-details-marker { display: none; }
.hf-ve-advanced > summary::before { content: "▸ "; }
.hf-ve-advanced[open] > summary::before { content: "▾ "; }
.hf-ve-advanced > summary:hover { color: var(--ve-fg); }
.hf-ve-advanced .hf-ve-field { margin-top: 6px; }
.hf-ve-file {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}
.hf-ve-note {
  margin: 0;
  min-width: 0;
  font-size: 12px;
  line-height: 1.4;
  color: var(--ve-muted);
}
.hf-ve-note[data-tone="error"] { color: var(--ve-danger); }
.hf-ve-note[data-tone="ok"] { color: var(--ve-fg); }

.hf-ve-swatch {
  width: 40px;
  height: 32px;
  flex-shrink: 0;
  padding: 2px;
  border: 1px solid var(--ve-line);
  border-radius: 8px;
  background: var(--ve-surface);
  cursor: pointer;
}

/* Nothing here moves.
 *
 * A press-down scale on every button and field, a scale-in on the tab panes, a
 * springing switch knob and a growing slider thumb were all flourish: the
 * control had already told you what it did by changing colour, and the motion
 * was a second, slower answer to a question already settled. What is left is
 * one colour transition, short enough to read as immediate and long enough not
 * to flicker. A control here may change colour; it does not move.
 *
 * Which is also why there is no prefers-reduced-motion block any more. There is
 * no motion left to reduce. */
.hf-ve-tint {
  transition:
    background-color 100ms ease,
    border-color 100ms ease,
    color 100ms ease;
}

.hf-ve-head-title { margin: 8px 0 28px; }
.hf-ve-head-title h1 { margin: 0; font-size: 44px; line-height: 1.1; font-weight: 700; letter-spacing: -0.02em; color: var(--ve-fg); }
.hf-ve-head-title p { margin: 12px 0 0; font-size: 18px; line-height: 1.5; color: var(--ve-muted); max-width: 70ch; }
@media (max-width: 640px) { .hf-ve-head-title h1 { font-size: 32px; } }
/* Item page anatomy: bar, stage beside Tune, tabs, tab body. */
.hf-ve-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 20px;
  margin-bottom: 16px;
}
.hf-ve-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 18px;
  font-size: 14px;
  color: var(--ve-muted);
}
.hf-ve-meta b { color: var(--ve-fg); font-weight: 600; }
.hf-ve-badge {
  padding: 2px 10px;
  border-radius: 9999px;
  font-size: 12px;
  background: var(--ve-hover);
}
.hf-ve-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.hf-ve-action {
  display: inline-grid;
  align-items: center;
  justify-items: center;
  padding: 8px 14px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  color: var(--ve-fg);
  background: var(--ve-hover);
  text-decoration: none;
  border: 0;
  cursor: pointer;
}
.hf-ve-action-label { grid-area: 1 / 1; }
.hf-ve-action-label[data-shown="false"] { visibility: hidden; }
.hf-ve-action:hover:not(:disabled) { background: var(--ve-line); }
.hf-ve-action:disabled { opacity: 0.4; cursor: default; }
.hf-ve-tune-foot .hf-ve-action { justify-content: center; white-space: nowrap; }
.hf-ve-action[data-primary="true"] { color: var(--ve-on-fg); background: var(--ve-on-bg); }
.hf-ve-action[data-primary="true"]:hover:not(:disabled) { background: var(--ve-on-bg); opacity: 0.88; }
.hf-ve-main { display: grid; gap: 16px; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 1024px) {
  .hf-ve-main[data-tune="true"] { grid-template-columns: minmax(0, 1fr) 340px; }
}
.hf-ve-stage {
  overflow: hidden;
  border: 1px solid var(--ve-line);
  border-radius: 14px;
  background: var(--ve-surface);
}
.hf-ve-stage .hf-ve-preview { border: 0; border-radius: 0; }
.hf-ve-caption { padding: 10px 16px; font-size: 13px; color: var(--ve-muted); }
.hf-ve-caption span + span { margin-left: 16px; }
.hf-ve-tune {
  position: relative;
  min-height: 320px;
  border: 1px solid var(--ve-line);
  border-radius: 14px;
  background: var(--ve-surface);
}
.hf-ve-tune-inner { display: flex; flex-direction: column; max-height: 520px; }
@media (min-width: 1024px) {
  .hf-ve-tune-inner { position: absolute; inset: 0; max-height: none; }
}
.hf-ve-tune-head {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--ve-line);
  font-weight: 600;
}
.hf-ve-tune-head small { font-weight: 400; font-size: 13px; color: var(--ve-muted); }
.hf-ve-tune-list-wrap { position: relative; flex: 1; min-height: 0; display: flex; }
.hf-ve-tune-list {
  flex: 1;
  min-height: 0;
  overflow: auto;
  overscroll-behavior: contain;
  display: grid;
  gap: 16px;
  padding: 16px;
  align-content: start;
  mask-image: linear-gradient(to bottom, transparent 0, #000 12px, #000 calc(100% - 12px), transparent 100%);
}
.hf-ve-tune-more {
  position: absolute;
  left: 50%;
  bottom: 6px;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 9999px;
  background: var(--ve-hover);
  color: var(--ve-muted);
  pointer-events: none;
  animation: hf-ve-tune-more-pulse 1.6s ease-in-out infinite;
}
@keyframes hf-ve-tune-more-pulse {
  0%, 100% { opacity: 1; transform: translateX(-50%) scale(1); }
  50% { opacity: 0.55; transform: translateX(-50%) scale(1.15); }
}
@media (prefers-reduced-motion: reduce) {
  .hf-ve-tune-more { animation: none; }
}
.hf-ve-tune-foot {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 8px;
  padding: 16px;
  border-top: 1px solid var(--ve-line);
}
.hf-ve-tabs-row { margin: 20px 0 0 16px; }
.hf-ve-tabs-row .hf-ve-tab { padding: 6px 16px; font-size: 14px; }
.hf-ve-tabs-row .hf-ve-tab small { margin-left: 6px; font-weight: 400; opacity: 0.7; }
.hf-ve-body { padding: 2rem 0 0 16px; }
.hf-ve-install { margin: 0 0 28px; }
.hf-ve-install-title { margin: 0 0 12px; font-size: 24px; line-height: 1.3; font-weight: 600; letter-spacing: -0.01em; color: var(--ve-fg); }
.hf-ve-about h3 { margin: 0 0 8px; font-size: 16px; font-weight: 600; }
.hf-ve-about p { margin: 0 0 12px; line-height: 1.6; max-width: 72ch; }
.hf-ve-about .hf-ve-attr { font-size: 14px; color: var(--ve-muted); }
.hf-ve-about .hf-ve-attr a { color: var(--ve-fg); text-decoration: underline; }
.hf-ve-body-pane[hidden] { display: none; }
.hf-ve-slots > [data-slot] { display: none; }
.hf-ve-slots[data-tab="code"] > [data-slot="code"],
.hf-ve-slots[data-tab="docs"] > [data-slot="docs"] { display: block; }
.hf-ve-body-pane .code-block pre,
.hf-ve-slots [data-slot="code"] pre { max-height: 560px; overflow: auto; }
@media (max-width: 640px) {
  .hf-ve-actions { width: 100%; }
  .hf-ve-action { flex: 1 1 calc(50% - 8px); justify-content: center; }
}

`;
  const isSvgPathData = value => typeof value === "string" && (/^\s*[Mm]\s*-?[\d.]/).test(value);
  const parsePathData = d => {
    const source = String(d);
    const arity = {
      M: 2,
      L: 2,
      H: 1,
      V: 1,
      C: 6,
      S: 4,
      Q: 4,
      T: 2,
      A: 7,
      Z: 0
    };
    const commands = [];
    let at = 0;
    let code = "";
    const separator = () => {
      while (at < source.length && (/[\s,]/).test(source[at])) at += 1;
    };
    const digits = () => {
      while (at < source.length && source[at] >= "0" && source[at] <= "9") at += 1;
    };
    const number = () => {
      separator();
      const start = at;
      if (source[at] === "+" || source[at] === "-") at += 1;
      digits();
      if (source[at] === ".") {
        at += 1;
        digits();
      }
      if (source[at] === "e" || source[at] === "E") {
        at += 1;
        if (source[at] === "+" || source[at] === "-") at += 1;
        digits();
      }
      const text = source.slice(start, at);
      const value = Number(text);
      if (text === "" || !Number.isFinite(value)) {
        throw new Error(`expected a number at character ${start + 1}`);
      }
      return value;
    };
    const flag = () => {
      separator();
      const character = source[at];
      if (character !== "0" && character !== "1") {
        throw new Error(`expected an arc flag at character ${at + 1}`);
      }
      at += 1;
      return Number(character);
    };
    separator();
    while (at < source.length) {
      const character = source[at];
      if ((/[a-zA-Z]/).test(character)) {
        if (arity[character.toUpperCase()] === undefined) {
          throw new Error(`unknown command "${character}"`);
        }
        code = character;
        at += 1;
      } else if (code === "") {
        throw new Error("path data must open with a command");
      } else if (code === "M" || code === "m") {
        code = code === "M" ? "L" : "l";
      } else if (code === "Z" || code === "z") {
        throw new Error(`expected a command at character ${at + 1}`);
      }
      const letter = code.toUpperCase();
      const args = [];
      if (letter === "A") {
        args.push(number(), number(), number(), flag(), flag(), number(), number());
      } else {
        for (let taken = 0; taken < arity[letter]; taken += 1) args.push(number());
      }
      commands.push({
        code,
        args
      });
      separator();
    }
    if (commands.length === 0) throw new Error("path data is empty");
    return commands;
  };
  const normalisePathData = commands => {
    const out = [];
    let x = 0;
    let y = 0;
    let startX = 0;
    let startY = 0;
    let cubicControl = null;
    let quadraticControl = null;
    for (const {code, args} of commands) {
      const letter = code.toUpperCase();
      const relative = code !== letter;
      const dx = relative ? x : 0;
      const dy = relative ? y : 0;
      const pairs = values => {
        const mapped = [];
        for (let index = 0; index + 1 < values.length; index += 2) {
          mapped.push(values[index] + dx, values[index + 1] + dy);
        }
        return mapped;
      };
      let nextCubic = null;
      let nextQuadratic = null;
      if (letter === "M") {
        const [px, py] = pairs(args);
        out.push({
          code: "M",
          args: [px, py]
        });
        x = px;
        y = py;
        startX = px;
        startY = py;
      } else if (letter === "L") {
        const [px, py] = pairs(args);
        out.push({
          code: "L",
          args: [px, py]
        });
        x = px;
        y = py;
      } else if (letter === "H") {
        x = args[0] + dx;
        out.push({
          code: "L",
          args: [x, y]
        });
      } else if (letter === "V") {
        y = args[0] + dy;
        out.push({
          code: "L",
          args: [x, y]
        });
      } else if (letter === "C") {
        const points = pairs(args);
        out.push({
          code: "C",
          args: points
        });
        nextCubic = [points[2], points[3]];
        x = points[4];
        y = points[5];
      } else if (letter === "S") {
        const points = pairs(args);
        const first = cubicControl ? [2 * x - cubicControl[0], 2 * y - cubicControl[1]] : [x, y];
        out.push({
          code: "C",
          args: [...first, ...points]
        });
        nextCubic = [points[0], points[1]];
        x = points[2];
        y = points[3];
      } else if (letter === "Q") {
        const points = pairs(args);
        out.push({
          code: "Q",
          args: points
        });
        nextQuadratic = [points[0], points[1]];
        x = points[2];
        y = points[3];
      } else if (letter === "T") {
        const points = pairs(args);
        const control = quadraticControl ? [2 * x - quadraticControl[0], 2 * y - quadraticControl[1]] : [x, y];
        out.push({
          code: "Q",
          args: [...control, ...points]
        });
        nextQuadratic = control;
        x = points[0];
        y = points[1];
      } else if (letter === "A") {
        const endX = args[5] + dx;
        const endY = args[6] + dy;
        out.push(...arcToCubics(x, y, args[0], args[1], args[2], args[3], args[4], endX, endY));
        x = endX;
        y = endY;
      } else if (letter === "Z") {
        out.push({
          code: "Z",
          args: []
        });
        x = startX;
        y = startY;
      }
      cubicControl = nextCubic;
      quadraticControl = nextQuadratic;
    }
    return out;
  };
  const arcToCubics = (x1, y1, rx, ry, rotation, largeArc, sweep, x2, y2) => {
    if (x1 === x2 && y1 === y2) return [];
    let radiusX = Math.abs(rx);
    let radiusY = Math.abs(ry);
    if (radiusX === 0 || radiusY === 0) return [{
      code: "L",
      args: [x2, y2]
    }];
    const phi = rotation * Math.PI / 180;
    const cosPhi = Math.cos(phi);
    const sinPhi = Math.sin(phi);
    const midX = (x1 - x2) / 2;
    const midY = (y1 - y2) / 2;
    const primeX = cosPhi * midX + sinPhi * midY;
    const primeY = -sinPhi * midX + cosPhi * midY;
    const oversize = primeX * primeX / (radiusX * radiusX) + primeY * primeY / (radiusY * radiusY);
    if (oversize > 1) {
      const grow = Math.sqrt(oversize);
      radiusX *= grow;
      radiusY *= grow;
    }
    const denominator = radiusX * radiusX * primeY * primeY + radiusY * radiusY * primeX * primeX;
    const numerator = radiusX * radiusX * radiusY * radiusY - radiusX * radiusX * primeY * primeY - radiusY * radiusY * primeX * primeX;
    const factor = (largeArc === sweep ? -1 : 1) * Math.sqrt(Math.max(0, numerator) / denominator);
    const centrePrimeX = factor * radiusX * primeY / radiusY;
    const centrePrimeY = -factor * radiusY * primeX / radiusX;
    const centreX = cosPhi * centrePrimeX - sinPhi * centrePrimeY + (x1 + x2) / 2;
    const centreY = sinPhi * centrePrimeX + cosPhi * centrePrimeY + (y1 + y2) / 2;
    const angle = (ux, uy, vx, vy) => {
      const length = Math.hypot(ux, uy) * Math.hypot(vx, vy);
      const cosine = length === 0 ? 1 : Math.min(1, Math.max(-1, (ux * vx + uy * vy) / length));
      return (ux * vy - uy * vx < 0 ? -1 : 1) * Math.acos(cosine);
    };
    const fromX = (primeX - centrePrimeX) / radiusX;
    const fromY = (primeY - centrePrimeY) / radiusY;
    const toX = (-primeX - centrePrimeX) / radiusX;
    const toY = (-primeY - centrePrimeY) / radiusY;
    const start = angle(1, 0, fromX, fromY);
    let sweptAngle = angle(fromX, fromY, toX, toY);
    if (!sweep && sweptAngle > 0) sweptAngle -= 2 * Math.PI;
    if (sweep && sweptAngle < 0) sweptAngle += 2 * Math.PI;
    const steps = Math.max(1, Math.ceil(Math.abs(sweptAngle) / (Math.PI / 2)));
    const step = sweptAngle / steps;
    const handle = 4 / 3 * Math.tan(step / 4);
    const at = t => [centreX + radiusX * Math.cos(t) * cosPhi - radiusY * Math.sin(t) * sinPhi, centreY + radiusX * Math.cos(t) * sinPhi + radiusY * Math.sin(t) * cosPhi];
    const slope = t => [-radiusX * Math.sin(t) * cosPhi - radiusY * Math.cos(t) * sinPhi, -radiusX * Math.sin(t) * sinPhi + radiusY * Math.cos(t) * cosPhi];
    const out = [];
    for (let index = 0; index < steps; index += 1) {
      const from = start + index * step;
      const to = from + step;
      const [ax, ay] = at(from);
      const [bx, by] = at(to);
      const [aSlopeX, aSlopeY] = slope(from);
      const [bSlopeX, bSlopeY] = slope(to);
      out.push({
        code: "C",
        args: [ax + handle * aSlopeX, ay + handle * aSlopeY, bx - handle * bSlopeX, by - handle * bSlopeY, bx, by]
      });
    }
    const last = out[out.length - 1];
    last.args[4] = x2;
    last.args[5] = y2;
    return out;
  };
  const transformPathData = (segments, matrix) => segments.map(({code, args}) => {
    const moved = [];
    for (let index = 0; index + 1 < args.length; index += 2) {
      const x = args[index];
      const y = args[index + 1];
      moved.push(matrix.a * x + matrix.c * y + matrix.e, matrix.b * x + matrix.d * y + matrix.f);
    }
    return {
      code,
      args: moved
    };
  });
  const fitMatrix = (source, target) => {
    const chosen = Math.min(target.width / source.width, target.height / source.height);
    const scale = Number.isFinite(chosen) && chosen > 0 ? chosen : 1;
    return {
      a: scale,
      b: 0,
      c: 0,
      d: scale,
      e: target.x + target.width / 2 - (source.x + source.width / 2) * scale,
      f: target.y + target.height / 2 - (source.y + source.height / 2) * scale
    };
  };
  const printPathData = segments => segments.map(({code, args}) => {
    if (args.length === 0) return code;
    const numbers = args.map(value => {
      const rounded = Math.round(value * 100) / 100;
      return String(Object.is(rounded, -0) ? 0 : rounded);
    });
    return `${code} ${numbers.join(" ")}`;
  }).join(" ");
  const shapePathData = (tag, attrs) => {
    const number = (name, fallback = 0) => {
      const value = parseFloat(attrs[name]);
      return Number.isFinite(value) ? value : fallback;
    };
    if (tag === "path") {
      const d = typeof attrs.d === "string" ? attrs.d.trim() : "";
      return d === "" ? null : d;
    }
    if (tag === "rect") {
      const width = number("width");
      const height = number("height");
      if (!(width > 0) || !(height > 0)) return null;
      const x = number("x");
      const y = number("y");
      const declaredX = parseFloat(attrs.rx);
      const declaredY = parseFloat(attrs.ry);
      const rawX = Number.isFinite(declaredX) ? declaredX : declaredY;
      const rawY = Number.isFinite(declaredY) ? declaredY : declaredX;
      const rx = Math.min(Math.max(Number.isFinite(rawX) ? rawX : 0, 0), width / 2);
      const ry = Math.min(Math.max(Number.isFinite(rawY) ? rawY : 0, 0), height / 2);
      if (rx === 0 || ry === 0) {
        return `M ${x} ${y} H ${x + width} V ${y + height} H ${x} Z`;
      }
      return [`M ${x + rx} ${y}`, `H ${x + width - rx}`, `A ${rx} ${ry} 0 0 1 ${x + width} ${y + ry}`, `V ${y + height - ry}`, `A ${rx} ${ry} 0 0 1 ${x + width - rx} ${y + height}`, `H ${x + rx}`, `A ${rx} ${ry} 0 0 1 ${x} ${y + height - ry}`, `V ${y + ry}`, `A ${rx} ${ry} 0 0 1 ${x + rx} ${y}`, "Z"].join(" ");
    }
    if (tag === "circle" || tag === "ellipse") {
      const rx = tag === "circle" ? number("r") : number("rx");
      const ry = tag === "circle" ? number("r") : number("ry");
      if (!(rx > 0) || !(ry > 0)) return null;
      const cx = number("cx");
      const cy = number("cy");
      return [`M ${cx - rx} ${cy}`, `A ${rx} ${ry} 0 1 0 ${cx + rx} ${cy}`, `A ${rx} ${ry} 0 1 0 ${cx - rx} ${cy}`, "Z"].join(" ");
    }
    if (tag === "line") {
      const x1 = number("x1");
      const y1 = number("y1");
      const x2 = number("x2");
      const y2 = number("y2");
      if (x1 === x2 && y1 === y2) return null;
      return `M ${x1} ${y1} L ${x2} ${y2}`;
    }
    if (tag === "polyline" || tag === "polygon") {
      const values = String(attrs.points ?? "").trim().split(/[\s,]+/).map(Number).filter(value => Number.isFinite(value));
      if (values.length < 4) return null;
      const steps = [`M ${values[0]} ${values[1]}`];
      for (let index = 2; index + 1 < values.length; index += 2) {
        steps.push(`L ${values[index]} ${values[index + 1]}`);
      }
      if (tag === "polygon") steps.push("Z");
      return steps.join(" ");
    }
    return null;
  };
  const svgToPathData = (svgText, targetPathData, doc = document) => {
    const NS = "http://www.w3.org/2000/svg";
    const parsed = new DOMParser().parseFromString(String(svgText), "image/svg+xml");
    if (parsed.getElementsByTagName("parsererror").length > 0 || !parsed.documentElement || parsed.documentElement.localName !== "svg") {
      throw new Error("That file is not an SVG, or its markup is malformed.");
    }
    const host = doc.createElement("div");
    host.setAttribute("aria-hidden", "true");
    host.style.cssText = "position:fixed;left:-99999px;top:0;width:600px;height:600px;overflow:hidden;";
    const svg = doc.importNode(parsed.documentElement, true);
    host.appendChild(svg);
    doc.body.appendChild(host);
    try {
      const reference = doc.createElementNS(NS, "g");
      svg.appendChild(reference);
      const rootMatrix = reference.getScreenCTM();
      const defining = ["defs", "clipPath", "mask", "symbol", "marker", "pattern"];
      const isDefinition = element => {
        for (let node = element.parentNode; node && node !== svg; node = node.parentNode) {
          if (defining.includes(node.localName)) return true;
        }
        return false;
      };
      const shapes = [...svg.querySelectorAll("path,rect,circle,ellipse,line,polyline,polygon")];
      const segments = [];
      let shapesUsed = 0;
      let firstProblem = null;
      for (const element of shapes) {
        if (isDefinition(element)) continue;
        if (doc.defaultView.getComputedStyle(element).display === "none") continue;
        const attrs = {};
        for (const attribute of element.attributes) attrs[attribute.localName] = attribute.value;
        const d = shapePathData(element.localName, attrs);
        if (d === null) continue;
        let own;
        try {
          own = normalisePathData(parsePathData(d));
        } catch (error) {
          firstProblem = firstProblem ?? error.message;
          continue;
        }
        const matrix = element.getScreenCTM();
        segments.push(...rootMatrix && matrix ? transformPathData(own, rootMatrix.inverse().multiply(matrix)) : own);
        shapesUsed += 1;
      }
      if (segments.length === 0) {
        if (firstProblem) throw new Error(`This SVG has unreadable path data: ${firstProblem}.`);
        const untraceable = ["text", "image", "use"].find(tag => svg.getElementsByTagName(tag).length > 0);
        throw new Error(untraceable ? `This SVG draws with <${untraceable}>, which has no outline to trace. Convert it to paths and try again.` : "This SVG has no shapes to import.");
      }
      const probe = doc.createElementNS(NS, "path");
      svg.appendChild(probe);
      probe.setAttribute("d", printPathData(segments));
      const source = probe.getBBox();
      if (!(source.width > 0) || !(source.height > 0)) {
        if (!(source.width > 0) && !(source.height > 0)) {
          throw new Error("This SVG's shapes have no size.");
        }
      }
      probe.setAttribute("d", String(targetPathData));
      const target = probe.getBBox();
      return {
        d: printPathData(transformPathData(segments, fitMatrix(source, target))),
        shapes: shapesUsed
      };
    } finally {
      host.remove();
    }
  };
  const granularity = value => {
    const decimals = String(value).split(".")[1];
    return decimals ? Number(`1e-${decimals.length}`) : 1;
  };
  const readout = (variable, value) => {
    if (variable.type === "number") return "";
    if (variable.type === "color") return String(value);
    if (variable.type === "enum") {
      const hit = (variable.options ?? []).find(o => o.value === value);
      return hit ? hit.label ?? hit.value : String(value);
    }
    return "";
  };
  const control = (variable, value, onChange, note, onNote, onTyping) => {
    const options = variable.options ?? [];
    if (variable.type === "enum" && options.length > 0 && options.length <= 4) {
      return <div className="hf-ve-seg">
          {options.map(o => <button key={o.value} type="button" data-on={value === o.value} aria-pressed={value === o.value} onClick={() => onChange(o.value)} className="hf-ve-seg-btn hf-ve-tint">
              {o.label ?? o.value}
            </button>)}
        </div>;
    }
    if (variable.type === "enum") {
      return <select className="hf-ve-field hf-ve-select hf-ve-tint" value={value} aria-label={variable.label ?? variable.id} onChange={e => onChange(e.target.value)}>
          {options.map(o => <option key={o.value} value={o.value}>
              {o.label ?? o.value}
            </option>)}
        </select>;
    }
    if (variable.type === "number") {
      const min = Number(variable.min);
      const max = Number(variable.max);
      const unit = variable.unit ?? "";
      const declaredStep = Number(variable.step);
      const step = declaredStep > 0 ? declaredStep : 1;
      const label = variable.label ?? variable.id;
      if (!(Number.isFinite(min) && Number.isFinite(max) && max > min)) {
        return <input type="number" className="hf-ve-field hf-ve-mono hf-ve-tint" value={value} min={Number.isFinite(min) ? min : undefined} max={Number.isFinite(max) ? max : undefined} step={declaredStep > 0 ? declaredStep : granularity(variable.default)} aria-label={label} onChange={e => {
          const next = Number(e.target.value);
          if (e.target.value !== "" && Number.isFinite(next)) onChange(next);
        }} />;
      }
      const at = n => Math.min(1, Math.max(0, (Number(n) - min) / (max - min)));
      const now = at(value);
      const authored = at(variable.default);
      const place = fraction => ({
        offset: `${fraction * 100}%`,
        nudge: `${(0.5 - fraction) * 16}px`
      });
      const value_ = place(now);
      const default_ = place(authored);
      const grain = event => {
        event.currentTarget.step = event.shiftKey ? step / 10 : step;
      };
      return <div className="hf-ve-slider" style={{
        "--ve-fill": value_.offset,
        "--ve-fill-nudge": value_.nudge,
        "--ve-default": default_.offset,
        "--ve-default-nudge": default_.nudge
      }}>
          {}
          <div className="hf-ve-ruler" data-near={now < 0.14 ? "min" : now > 0.86 ? "max" : ""} aria-hidden="true">
            <span className="hf-ve-bound" data-end="min">
              {min}
            </span>
            <span className="hf-ve-bound" data-end="max">
              {max}
            </span>
            <span className="hf-ve-readout">
              {value}
              {unit}
            </span>
          </div>
          <span className="hf-ve-track">
            <input type="range" className="hf-ve-range" min={min} max={max} step={step} value={value} aria-label={label} aria-valuetext={`${value}${unit}`} onChange={e => onChange(Number(e.target.value))} onPointerDown={grain} onKeyDown={grain} onDoubleClick={() => onChange(variable.default)} />
            {}
            {Math.abs(now - authored) > 0.04 && <span className="hf-ve-default" aria-hidden="true" />}
          </span>
        </div>;
    }
    if (variable.type === "boolean") {
      const on = value === true || value === "true";
      return <button type="button" role="switch" aria-checked={on} aria-label={variable.label ?? variable.id} data-on={on} onClick={() => onChange(!on)} className="hf-ve-switch">
          <span className="hf-ve-switch-dot" />
        </button>;
    }
    if (variable.type === "color") {
      return <div className="flex items-center gap-2">
          <input type="color" className="hf-ve-swatch hf-ve-tint" value={value} aria-label={variable.label ?? variable.id} onChange={e => onChange(e.target.value)} />
          <input type="text" className="hf-ve-field hf-ve-mono hf-ve-tint" value={value} onChange={e => onChange(e.target.value)} onFocus={() => onTyping(variable.id)} onBlur={() => onTyping(null)} onKeyDown={e => {
        if (e.key === "Enter") e.currentTarget.blur();
      }} />
        </div>;
    }
    if (isSvgPathData(variable.default)) {
      const fileId = `hf-ve-file-${variable.id}`;
      const noteId = `hf-ve-note-${variable.id}`;
      const receive = file => {
        if (!file) return;
        file.text().then(text => {
          const {d, shapes} = svgToPathData(text, variable.default);
          onChange(d);
          onNote({
            tone: "ok",
            message: `${file.name}: ${shapes} shape${shapes === 1 ? "" : "s"} scaled to fit.`
          });
        }).catch(error => onNote({
          tone: "error",
          message: error.message
        }));
      };
      return <div className="hf-ve-drop" onDragOver={event => {
        event.preventDefault();
        event.currentTarget.dataset.over = "true";
      }} onDragLeave={event => {
        event.currentTarget.dataset.over = "false";
      }} onDrop={event => {
        event.preventDefault();
        event.currentTarget.dataset.over = "false";
        receive(event.dataTransfer.files[0]);
      }}>
          {}
          <div className="hf-ve-dropzone">
            <button type="button" className="hf-ve-btn hf-ve-tint" onClick={() => document.getElementById(fileId).click()}>
              Import SVG
            </button>
            <input id={fileId} type="file" accept=".svg,image/svg+xml" className="hf-ve-file" tabIndex={-1} aria-hidden="true" onChange={event => {
        receive(event.target.files[0]);
        event.target.value = "";
      }} />
            {}
            <p id={noteId} role="status" className="hf-ve-note" data-tone={note ? note.tone : ""}>
              {note ? note.message : "Or drop one here. Scaled to fit and centred."}
            </p>
          </div>
          <details className="hf-ve-advanced">
            <summary>Path data</summary>
            <input type="text" className="hf-ve-field hf-ve-mono hf-ve-tint" value={value} aria-label={variable.label ?? variable.id} onChange={e => onChange(e.target.value)} onFocus={() => onTyping(variable.id)} onBlur={() => onTyping(null)} onKeyDown={e => {
        if (e.key === "Enter") e.currentTarget.blur();
      }} />
          </details>
        </div>;
    }
    return <input type="text" className="hf-ve-field hf-ve-tint" value={value} aria-label={variable.label ?? variable.id} onChange={e => onChange(e.target.value)} onFocus={() => onTyping(variable.id)} onBlur={() => onTyping(null)} onKeyDown={e => {
      if (e.key === "Enter") e.currentTarget.blur();
    }} />;
  };
  const variablesKey = JSON.stringify(variables);
  const defaults = useMemo(() => {
    const built = {};
    for (const v of variables) if (v.default !== undefined) built[v.id] = v.default;
    return built;
  }, [variablesKey]);
  const urlKey = `vars-${compositionId}`;
  const readFromUrl = () => {
    if (typeof window === "undefined") return {};
    try {
      const raw = new URLSearchParams(window.location.search).get(urlKey);
      if (!raw) return {};
      const parsed = JSON.parse(raw);
      if (!parsed || typeof parsed !== "object" || Array.isArray(parsed)) return {};
      const declared = new Set(variables.map(v => v.id));
      return Object.fromEntries(Object.entries(parsed).filter(([id]) => declared.has(id)));
    } catch {
      return {};
    }
  };
  const [values, setValues] = useState(() => ({
    ...defaults,
    ...readFromUrl()
  }));
  useEffect(() => {
    const fromUrl = readFromUrl();
    if (Object.keys(fromUrl).length > 0) setValues(current => ({
      ...current,
      ...fromUrl
    }));
  }, []);
  useEffect(() => {
    if (typeof window === "undefined") return;
    const changed = Object.fromEntries(Object.entries(values).filter(([id, value]) => JSON.stringify(value) !== JSON.stringify(defaults[id])));
    const url = new URL(window.location.href);
    if (Object.keys(changed).length === 0) url.searchParams.delete(urlKey); else url.searchParams.set(urlKey, JSON.stringify(changed));
    const next = url.toString();
    if (next !== window.location.href) {
      window.history.replaceState(null, "", next);
      window.dispatchEvent(new CustomEvent("hf-vars-changed"));
    }
  }, [values, defaults, urlKey]);
  const [notes, setNotes] = useState({});
  const [typing, setTyping] = useState(null);
  const posted = useRef(null);
  const frame = useRef(null);
  const bootstrap = ["<!doctype html><html><head><meta charset='utf-8'>", "<style>html,body{margin:0;height:100%;overflow:hidden;background:transparent}", "hyperframes-player{display:block;width:100%;height:100%}</style>", '<script src="https://cdn.jsdelivr.net/npm/@hyperframes/player@latest/dist/hyperframes-player.global.js"></' + "script>", "</head><body><script>", "(function(){", `  var PAYLOAD = ${JSON.stringify(previewSrc)};`, `  var INITIAL = ${JSON.stringify({
    ...defaults,
    ...readFromUrl()
  })};`, "  var html = null, player = null, poll = null;", "  function withValues(source, values) {", "    var json = JSON.stringify(values);", "    var attr = json.replace(/'/g, '&#39;');", "    var out = source.replace(/\\sdata-variable-values=(?:\"[^\"]*\"|'[^']*')/gi, '');", "    out = out.replace(/(data-composition-src=)/gi, \"data-variable-values='\" + attr + \"' $1\");", "    var tag = '<' + 'script>window.__hfVariables=' + json + ';<' + '/script>';", "    return /<head[^>]*>/i.test(out)", "      ? out.replace(/<head([^>]*)>/i, '<head$1>' + tag)", "      : tag + out;", "  }", "  function arm(resumeAt) {", "    clearInterval(poll);", "    var last = -1, tries = 0, seeked = false;", "    poll = setInterval(function () {", "      if (player.ready) {", "        if (!seeked) { seeked = true; if (resumeAt > 0) player.seek(resumeAt); }", "        player.play();", "      }", "      if (seeked && player.currentTime > 0 && player.currentTime !== last) {", "        clearInterval(poll); return;", "      }", "      last = player.currentTime;", "      if (++tries > 150) clearInterval(poll);", "    }, 100);", "  }", "  function mount(values, resumeAt) {", "    if (html === null) return;", "    player.setAttribute('srcdoc', withValues(html, values));", "    arm(resumeAt || 0);", "  }", "  player = document.createElement('hyperframes-player');", "  player.setAttribute('controls', ''); player.setAttribute('muted', '');", "  document.body.appendChild(player);", "  player.addEventListener('ended', function () { player.seek(0); player.play(); });", "  fetch(PAYLOAD).then(function (r) { return r.json(); }).then(function (d) {", "    html = d.html; mount(INITIAL, 0);", "  }).catch(function (e) {", "    document.body.innerHTML = '<pre style=\"color:#f66;font:12px monospace;padding:12px\">preview unavailable: ' + e + '</pre>';", "  });", "  addEventListener('message', function (event) {", "    var values = event.data && event.data.hfVariables;", "    if (!values) return;", "    mount(values, player.currentTime || 0);", "  });", "})();", "</" + "script></body></html>"].join("");
  useEffect(() => {
    if (typing !== null) return;
    const payload = JSON.stringify(values);
    if (payload === posted.current) return;
    const timer = setTimeout(() => {
      const target = frame.current && frame.current.contentWindow;
      if (!target) return;
      posted.current = payload;
      target.postMessage({
        hfVariables: values
      }, window.location.origin);
    }, 150);
    return () => clearTimeout(timer);
  }, [values, typing]);
  const printed = JSON.stringify(values, null, 2).split("\n").join("\n  ");
  const attributes = [["data-composition-id", `"${compositionId}"`], ["data-composition-src", `"${compositionSrc}"`], ["data-variable-values", `'${printed}'`]];
  const snippetLines = [[[SHIKI.punct, "<"], [SHIKI.tag, "div"]]];
  for (const [name, literal] of attributes) {
    const [head, ...rest] = literal.split("\n");
    snippetLines.push([[SHIKI.attr, `  ${name}`], [SHIKI.equals, "="], [SHIKI.value, head]]);
    for (const line of rest) snippetLines.push([[SHIKI.value, line]]);
  }
  snippetLines.push([[SHIKI.punct, "></"], [SHIKI.tag, "div"], [SHIKI.punct, ">"]]);
  const dirty = variables.some(v => values[v.id] !== defaults[v.id]);
  const hasTune = variables.length > 0;
  const [tab, setTab] = useState("preview");
  const lines = meta.codeLines;
  const TABS = [["preview", "Preview"], ...hasCode ? [["code", "Code", lines ? `${lines} ln` : ""]] : [], ["install", "Snippet"], ["docs", "Docs"]];
  const changedValues = () => {
    const changed = {};
    for (const v of variables) {
      if (JSON.stringify(values[v.id]) !== JSON.stringify(defaults[v.id])) changed[v.id] = values[v.id];
    }
    return changed;
  };
  const renderCommand = (() => {
    const changed = changedValues();
    const vars = Object.keys(changed).length ? ` --variables '${JSON.stringify(changed).replace(/'/g, "'\\''")}'` : "";
    return `# Run from the installed project's root.\nnpx hyperframes render --composition '${compositionSrc}'${vars}`;
  })();
  const agentRequest = (() => {
    const changed = changedValues();
    const base = `Install the HyperFrames catalog item "${compositionId}" (${title || compositionId}) into my project with \`npx hyperframes add ${compositionId}\`, mount it at the point of my composition where it should play, and verify with \`npx hyperframes check\`.`;
    const set = Object.entries(changed).map(([id, value]) => `${id} = ${JSON.stringify(value)}`);
    return set.length ? `${base} Set ${set.join(", ")}; keep the other variables at their defaults.` : `${base} Keep the default variables unless I say otherwise.`;
  })();
  const [copiedKey, setCopiedKey] = useState("");
  const copy = async (key, text) => {
    let ok = false;
    try {
      await navigator.clipboard.writeText(text);
      ok = true;
    } catch {
      const area = document.createElement("textarea");
      area.value = text;
      area.setAttribute("readonly", "");
      area.style.cssText = "position:fixed;opacity:0";
      document.body.appendChild(area);
      area.select();
      ok = document.execCommand("copy");
      area.remove();
    }
    if (!ok) return;
    setCopiedKey(key);
    setTimeout(() => setCopiedKey(current => current === key ? "" : current), 1400);
  };
  const CopyAction = ({id, label, text, primary}) => {
    const shown = copiedKey === id ? "Copied" : label;
    return <button type="button" className="hf-ve-action" data-primary={primary ? "true" : "false"} onClick={() => copy(id, typeof text === "function" ? text() : text)}>
        {[label, "Copied"].map(name => <span key={name} className="hf-ve-action-label" data-shown={String(name === shown)}>
            {name}
          </span>)}
      </button>;
  };
  const wiring = snippetLines.map(tokens => tokens.map(([, text]) => text).join("")).join("\n");
  const mountText = `${wiring}\n`;
  const flagNotice = needsFlag ? <div className="flex aspect-video w-full items-center justify-center text-sm text-zinc-500">
      Needs <code>chrome://flags/#{needsFlag}</code> to render live
    </div> : null;
  const player = <iframe ref={frame} srcDoc={bootstrap} className="hf-ve-preview block aspect-video w-full" title={`${compositionId} preview`} />;
  const recordedRef = useRef(null);
  const [reduced, setReduced] = useState(() => typeof window !== "undefined" && window.matchMedia("(prefers-reduced-motion: reduce)").matches);
  useEffect(() => {
    const query = window.matchMedia("(prefers-reduced-motion: reduce)");
    const onChange = event => setReduced(event.matches);
    query.addEventListener("change", onChange);
    return () => query.removeEventListener("change", onChange);
  }, []);
  useEffect(() => {
    const clip = recordedRef.current;
    if (!reduced || !clip) return;
    clip.pause();
    clip.removeAttribute("src");
    clip.load();
  }, [reduced]);
  const recorded = video ? <video ref={recordedRef} className="block aspect-video w-full object-cover" src={reduced ? undefined : video} poster={poster} autoPlay={!reduced} muted loop={!reduced} playsInline /> : null;
  const [hasAdapter, setHasAdapter] = useState(null);
  const hasWebgpuAdapter = (gpu, timeoutMs) => {
    const probe = new Promise(resolve => resolve(gpu?.requestAdapter())).then(adapter => Boolean(adapter), () => false);
    const timeout = new Promise(resolve => setTimeout(resolve, timeoutMs, false));
    return Promise.race([probe, timeout]);
  };
  useEffect(() => {
    if (webgpu) hasWebgpuAdapter(navigator.gpu, 3000).then(setHasAdapter);
  }, [webgpu]);
  const adapterMissing = webgpu && hasAdapter === false;
  const tunePanel = hasTune && !(webgpu && hasAdapter !== true);
  let webgpuStage = player;
  if (webgpu && hasAdapter === null) webgpuStage = <div className="aspect-video w-full" />;
  if (adapterMissing) webgpuStage = recorded;
  const stageNode = webgpu ? webgpuStage : (recorded ?? flagNotice) ?? player;
  let caption = "Live composition · HyperFrames Player";
  if (adapterMissing) caption = "Recorded preview · live playback needs WebGPU, which this browser does not offer"; else if (!webgpu && (video || needsFlag)) caption = "Recorded preview";
  const slotOf = node => {
    for (let cur = node; React.isValidElement(cur); cur = React.Children.toArray(cur.props.children)[0]) {
      if (cur.props.slot) return cur.props.slot;
    }
    return null;
  };
  const allSlots = React.Children.toArray(children);
  const installSlot = allSlots.find(child => slotOf(child) === "install") ?? null;
  const otherSlots = allSlots.filter(child => child !== installSlot);
  const seconds = meta.duration ? `${meta.duration} s` : null;
  const size = meta.width && meta.height ? `${meta.width}×${meta.height}` : null;
  return <div className="hf-ve my-4">
      <style dangerouslySetInnerHTML={{
    __html: CSS
  }} />

      <div className="not-prose">
        <header className="hf-ve-head-title">
          <h1>{title}</h1>
          {description && <p>{description}</p>}
        </header>
      </div>

      {installSlot && <div className="hf-ve-install">
          <h2 className="hf-ve-install-title">Install</h2>
          {installSlot}
        </div>}

      <div className="not-prose">

        <div className="hf-ve-bar">
          <div className="hf-ve-meta">
            {seconds && <span>
                <b>{seconds}</b> duration
              </span>}
            {size && <b>{size}</b>}
            {hasTune && <span>
                <b>{variables.length}</b> {variables.length === 1 ? "variable" : "variables"}
              </span>}
            {meta.category && <b>{meta.category}</b>}
            {meta.badge && <span className="hf-ve-badge">{meta.badge}</span>}
          </div>
          <div className="hf-ve-actions">
            <CopyAction id="agent" label="Copy agent request" text={agentRequest} primary />
            <CopyAction id="wiring" label="Copy wiring" text={mountText} />
            <CopyAction id="link" label="Copy link" text={() => window.location.href} />
            {rawUrl && <a className="hf-ve-action" href={rawUrl} target="_blank" rel="noopener noreferrer">
                Raw
              </a>}
          </div>
        </div>

        <div className="hf-ve-main" data-tune={tunePanel ? "true" : "false"}>
          <div className="hf-ve-stage">
            {stageNode}
            <div className="hf-ve-caption">
              {(seconds || size) && <span>{[seconds, size && `${size} preview`].filter(Boolean).join(" · ")}</span>}
              <span>{caption}</span>
            </div>
          </div>

          {tunePanel && <aside className="hf-ve-tune" aria-label="Tune">
              <div className="hf-ve-tune-inner">
                <div className="hf-ve-tune-head">
                  Tune <small>{variables.length} {variables.length === 1 ? "variable" : "variables"}</small>
                </div>
                <TuneList variables={variables} values={values} notes={notes} onValues={setValues} onNotes={setNotes} onTyping={setTyping} control={control} readout={readout} />
                <div className="hf-ve-tune-foot">
                  <button type="button" onClick={() => {
    setValues(defaults);
    setNotes({});
  }} disabled={!dirty} className="hf-ve-action">
                    Reset
                  </button>
                  <CopyAction id="json" label="Copy JSON" text={() => JSON.stringify(dirty ? changedValues() : defaults, null, 2)} />
                  <CopyAction id="render" label="Copy render cmd" text={renderCommand} />
                </div>
              </div>
            </aside>}
        </div>

        <div className="hf-ve-tabs hf-ve-tabs-row" role="tablist">
          {TABS.map(([id, label, note]) => <button key={id} type="button" role="tab" data-on={tab === id} aria-selected={tab === id} onClick={() => setTab(id)} className="hf-ve-tab hf-ve-tint">
              {label}
              {note ? <small>{note}</small> : null}
            </button>)}
        </div>
      </div>

      <div className="hf-ve-body">
        {}
        <div className="hf-ve-slots" data-tab={tab}>
          {otherSlots}
        </div>
        <div className="hf-ve-body-pane hf-ve-about not-prose" hidden={tab !== "preview"}>
          <h3>About</h3>
          {about && <p>{about}</p>}
          {attribution && <p className="hf-ve-attr">
              {attribution.author ? <>
                  Created by{" "}
                  {attribution.authorUrl ? <a href={attribution.authorUrl} target="_blank" rel="noopener noreferrer">
                      {attribution.author}
                    </a> : attribution.author}{" "}
                  ·{" "}
                </> : null}
              Registry item{" "}
              <a href={`https://github.com/heygen-com/hyperframes/tree/main/${attribution.path}`} target="_blank" rel="noopener noreferrer">
                heygen-com/hyperframes
              </a>{" "}
              · <code>{attribution.path}</code>
              {attribution.tags.length > 0 ? ` · ${attribution.tags.join(", ")}` : ""}
            </p>}
        </div>
        <div className="hf-ve-body-pane hf-ve-snippet not-prose" hidden={tab !== "install"}>
          {}
          <CodeBlock filename="index.html">
            <pre className="shiki shiki-themes github-light-default dark-plus" style={{
    backgroundColor: "rgb(255, 255, 255)",
    "--shiki-dark-bg": "#0B0C0E",
    color: "rgb(31, 35, 40)",
    "--shiki-dark": "#D4D4D4"
  }}>
              <code>
                {snippetLines.map((tokens, line) => <span key={line} className="line">
                    {tokens.map(([style, text], token) => <span key={token} style={style}>
                        {text}
                      </span>)}
                    {"\n"}
                  </span>)}
              </code>
            </pre>
          </CodeBlock>
        </div>
      </div>
    </div>;
};

<CatalogDetail previewSrc="/public/catalog/components/motion-blur.json" compositionId="motion-blur" compositionSrc="compositions/components/motion-blur.html" title="Motion Blur" description="After Effects-style motion blur — integrates each element over a shutter window (shutter angle, phase, samples per frame) by sampling the GSAP timeline at sub-frame times and averaging equal-weight additive copies of the element along its real trajectory, so translation, scale, rotation, 3D rotation and skew all drive the smear" variables={[]} meta={{"category":"Effects","badge":"Stable","codeLines":722}} attribution={{"path":"registry/components/motion-blur","tags":["effect","motion-blur","shutter","after-effects","velocity","animation"]}} hasCode rawUrl="https://raw.githubusercontent.com/heygen-com/hyperframes/main/registry/components/motion-blur/motion-blur.html">
  <CatalogSlot slot="code">
    ```html motion-blur.html theme={null}
    <!--
      Motion Blur — After Effects-style shutter-based motion blur.

      Usage: paste this snippet into your composition, then put
      data-hf-motion-blur on any element your GSAP timeline animates.
      Nothing else to call, and no order to get wrong.

      How it works — the same model After Effects uses for the layer Motion Blur
      switch (temporal supersampling), synthesised inside the page because the
      renderer captures one instant per frame with no shutter:

        1. After every timeline update (each rendered frame), the snippet seeks
           the timeline to `samplesPerFrame` sub-frame times spread evenly across
           the shutter window, reads each target's RESOLVED `transform` at every
           sample, then restores the frame time. Seeks run with events suppressed,
           so no user callbacks fire and the DOM ends up exactly where the frame
           left it. Reading the resolved matrix rather than a list of named GSAP
           properties is what makes every driver work: translation, scale,
           rotation, 3D rotation and skew arrive in the same one value, and a
           driver nobody thought of needs no change here.
        2. One copy of the element per sample is stacked in an isolated group,
           each carrying its sample's transform, each at 1/N opacity with
           `mix-blend-mode: plus-lighter`. plus-lighter adds premultiplied colour,
           so N+1 copies at 1/N sum to the average — the shutter integral. The
           isolation is load-bearing: without a transparent backdrop of its own
           the first copy would add onto the page and blow a light background out
           to white. Result: a smear along the actual trajectory whose extent is
           speed × shutter time, with no decaying one-sided trail. The tails —
           where fewer copies overlap — step down evenly at 1/N per copy; wherever
           the element travels less than its own size the copies pile up past 1
           and clamp, so the middle of the smear is solid rather than a plateau.
        3. The element itself paints over that group, sharp and at full opacity.
           No single copy ever exceeds 1/N, so a moving edge resolves as a
           staircase of ghosts behind a solid frame-time instance. The group
           carries the element's own opacity, so a beat that moves and fades at
           once fades its smear with it.
        4. When every sampled transform collapses to the current one (element at
           rest), the group is hidden so the element renders sharp.

      Shutter window (AE semantics, per frame at time t, frame interval 1/fps):
        shutterTime = shutterAngle / 360 / fps
        windowStart = t + shutterPhase / 360 / fps
        copy k      = windowStart + k / N × shutterTime,   k = 0..N  (N+1 copies)
      N counts sub-intervals, so both ends of the window carry a copy.
      Defaults (shutterAngle 720, shutterPhase -360) integrate [t - 1/fps, t + 1/fps]:
      a solid moving at 2000 px/s at 30 fps smears 133 px, centred on its position.

      These defaults are measured, not assumed. On a 1920×1080 / 30 fps After Effects
      export of translating text, the outermost duplicate on the trailing side sits
      exactly at the previous frame's position and the outermost leading duplicate
      exactly at the next frame's, with 8 evenly spaced duplicates in between on each
      side (window = 2 frames = 720°, phase -360°, 16 sub-intervals). Reading the ghost
      staircase across a stroke gives steps of 0.063 ± 0.002 of the sharp text
      intensity — a flat 1/16 per duplicate, with no taper toward the window edges
      (triangle weighting scores 1.6 dB worse against the same export). The sharp
      instance on top is what keeps total ink above the unblurred frame's.

      Requirements:
      - Elements must be animated via `transform` (GSAP x/y/scale/rotation and the
        3D and skew properties all qualify), not left/top. Transformed ancestors
        are still not compensated.
      - A 3D beat reads its perspective off the element's parent and applies it per
        copy, so the vanishing point follows each copy's transform-origin rather
        than the parent's perspective-origin. Those agree when the element is
        centred in its perspective parent, which is how a 3D beat is authored.
      - A copy drops the element's id but keeps its classes, because a class rule is
        the only thing that can still style a copy's pseudo-elements. So a selector
        written against a class matches the copies too: after attaching, address the
        element by id or by reference, never by a class a copy also carries.
      - A target is blurred once: a second attachMotionBlur() call naming the same
        element leaves the first call's copies in place rather than stacking a
        second set over them.
      - Cost is N + 1 copies of the target's whole subtree, restyled on attach and
        on resize and re-transformed every frame. Point it at the element that
        moves, not at a container holding it.
      - The host must render the timeline for the blur to update — HyperFrames
        seeks every frame. A fresh paused timeline that is never seeked shows no
        blur on its first frame.
      - A declarative target is attached as soon as its composition's timeline is
        registered, and the registry is also polled for about eight seconds after
        load, so a composition that mounts asynchronously is picked up too. A
        target added to the document after that window needs attachMotionBlur().
      - GSAP must be loaded before this snippet executes.

      API:
        data-hf-motion-blur on the element that moves. Empty for defaults, else a
          JSON OBJECT of the options below (double quotes on the keys). The
          element's timeline is the one registered under the data-composition-id of
          its nearest ancestor carrying that attribute, so a sub-composition's
          targets follow that sub-composition.
          Three things warn rather than rendering sharp in silence: a target no
          composition ever registers a timeline for, a value that is not JSON, and
          a value that parses but is not an object (null, a number, a string).
          A second timeline registered under the same key also warns: the copies
          keep following the first one.
        attachMotionBlur(selector, timeline, options?) — the imperative form, for a
          target built after the polling window. Call it AFTER defining all tweens,
          so the timeline's final duration is known.
          Either form blurs a given element once, whichever names it first.

      Options:
        shutterAngle     — degrees of the frame interval the shutter is open
                           (default 720 = two frames, as measured off the AE
                           reference; 360 = one frame, 0 disables)
        shutterPhase     — degrees offset of the window start from the frame
                           time (default -360 = centred on the frame, one frame
                           back, like the AE reference)
        samplesPerFrame  — sub-intervals of the shutter window, so N+1 duplicates
                           each at 1/N opacity (default 16, max 64)
        fps              — composition frame rate (default: the data-fps of the
                           target's own composition root, else 30). Pass it
                           explicitly when rendering with an fps override
                           (`hyperframes render --fps`).

      A key that is none of the four, or a value that is not a finite number, is
      refused by name rather than read as defaults. Both halves matter: a
      non-numeric angle hides the smear, and a non-numeric phase seeks every copy
      to NaN, which parks them at the timeline's start.
    -->

    <script>
      (function () {
        /* SHUTTER_SNIPPET_START */
        if (!window._hfMbUid) window._hfMbUid = 0;
        if (!window._hfMbAttached) window._hfMbAttached = new WeakSet();
        if (!window._hfMbSkipped) window._hfMbSkipped = new WeakSet();
        if (!window._hfMbProxies) window._hfMbProxies = new WeakSet();
        if (!window._hfMbTimeline) window._hfMbTimeline = new WeakMap();
        if (!window._hfMbWarned) window._hfMbWarned = new WeakSet();

        // The declarative form. A copy of a target must not carry it, or the copy is swept
        // as a target of its own; the group's own marker is `data-hf-motion-blur-group`.
        var SWEEP_ATTR = "data-hf-motion-blur";
        // About eight seconds. Long enough for an asynchronously mounted sub-composition, short
        // enough that a page with a genuine mistake in it reports before anyone stops watching.
        var POLL_MS = 32;
        var POLL_TICKS = 250;
        var SWEEP_SELECTOR = "[" + SWEEP_ATTR + "]";
        var OPTION_KEYS = ["shutterAngle", "shutterPhase", "samplesPerFrame", "fps"];

        // A copy is a deep clone, so the attribute rides along on the root AND on every marked
        // descendant. Any one left behind is swept as a target of its own, which clones again.
        var COPY_STRIP = [SWEEP_ATTR, "data-composition-id", "data-fps"];

        function stripAttrs(el) {
          for (var a = 0; a < COPY_STRIP.length; a++) el.removeAttribute(COPY_STRIP[a]);
        }

        function stripCopyAttrs(root) {
          stripAttrs(root);
          var inner = root.querySelectorAll("[" + COPY_STRIP.join("],[") + "]");
          for (var i = 0; i < inner.length; i++) stripAttrs(inner[i]);
        }

        // Shutter length is measured in frames, so the snippet must know the composition
        // frame rate: explicit option, else the target's OWN root, else the first root in
        // the document, else 30. The target's root is what makes two compositions on one
        // page read their own data-fps instead of sharing the first one written.
        function resolveFps(optionFps, target) {
          var explicit = Number(optionFps);
          if (explicit > 0) return explicit;

          var scoped = target ? target.closest("[data-composition-id][data-fps]") : null;
          var root = scoped || document.querySelector("[data-composition-id][data-fps]");
          var rootFps = root ? Number(root.getAttribute("data-fps")) : 0;
          if (rootFps > 0) return rootFps;

          return 30;
        }

        function numOption(value, fallback) {
          return value !== undefined ? Number(value) : fallback;
        }

        // A resolved `transform` is either "none", a 2D matrix(a,b,c,d,e,f) or a 3D
        // matrix3d of 16. Splitting the numbers into the linear part and the
        // translation is what lets the deadband below use a pixel tolerance on the
        // one and an angle/ratio tolerance on the other.
        function parseTransform(value) {
          if (!value || value === "none") return { linear: [1, 0, 0, 1], translate: [0, 0, 0] };
          var nums = value
            .slice(value.indexOf("(") + 1, -1)
            .split(",")
            .map(parseFloat);
          if (nums.length === 16) {
            return {
              linear: [
                nums[0],
                nums[1],
                nums[2],
                nums[4],
                nums[5],
                nums[6],
                nums[8],
                nums[9],
                nums[10],
                nums[3],
                nums[7],
                nums[11],
                nums[15],
              ],
              translate: [nums[12], nums[13], nums[14]],
            };
          }
          return {
            linear: [nums[0], nums[1], nums[2], nums[3]],
            translate: [nums[4], nums[5], 0],
          };
        }

        // Deadband: half a pixel of travel, a thousandth of a unit of linear change,
        // about 0.06 degrees or 0.1% of scale. Below it the average is the source.
        // The 2D and 3D forms have different arities, so a change of form counts as
        // movement rather than being compared component by component.
        function differs(a, b) {
          if (a.linear.length !== b.linear.length) return true;
          for (var i = 0; i < a.linear.length; i++) {
            if (Math.abs(a.linear[i] - b.linear[i]) > 0.001) return true;
          }
          for (var j = 0; j < 3; j++) {
            if (Math.abs(a.translate[j] - b.translate[j]) > 0.5) return true;
          }
          return false;
        }

        window.attachMotionBlur = function (selector, tl, opts) {
          opts = opts || {};
          var shutterAngle = numOption(opts.shutterAngle, 720);
          var shutterPhase = numOption(opts.shutterPhase, -360);
          var requestedSamples = numOption(opts.samplesPerFrame, 16);
          var samples = Number.isFinite(requestedSamples)
            ? Math.max(2, Math.min(64, Math.round(requestedSamples)))
            : 16;
          var items = Array.isArray(selector) ? selector : [selector];
          var targets = items.reduce(function (acc, s) {
            if (typeof s === "string") {
              document.querySelectorAll(s).forEach(function (el) {
                acc.push(el);
              });
            } else if (s instanceof Element) {
              acc.push(s);
            }
            return acc;
          }, []);

          // `samples` counts sub-intervals of the shutter window, so there is one copy at
          // every interval boundary — both ends of the window included — and each carries
          // 1/samples of the source. That is what the reference export shows: the outermost
          // copy sits exactly one frame away from the frame time, not half a step short.
          var copies = samples + 1;
          var alpha = String(1 / samples);

          // A copy is styled by nothing that selected the original: dropping the id also
          // drops every `#id` rule that gave it size, colour and font. So each copy carries
          // its own resolved style inline. Chrome returns "" for a computed style's cssText,
          // so the declarations are enumerated rather than taken wholesale.
          function resolvedStyles(source, out) {
            var cs = getComputedStyle(source);
            var text = "";
            for (var i = 0; i < cs.length; i++) {
              text += cs[i] + ":" + cs.getPropertyValue(cs[i]) + ";";
            }
            // A copy is a still of one instant. Left live, an inherited transition or
            // keyframe animation would carry it somewhere the timeline never sampled.
            out.push(text + "transition:none;animation:none;");
            for (var c = 0; c < source.children.length; c++) {
              resolvedStyles(source.children[c], out);
            }
            return out;
          }

          function paintResolvedStyles(copy, styles, cursor) {
            copy.style.cssText = styles[cursor.i++];
            for (var c = 0; c < copy.children.length; c++) {
              paintResolvedStyles(copy.children[c], styles, cursor);
            }
          }

          // Perspective applies to a parent's children only, and a copy is a grandchild.
          // Sharing the parent's 3D context would need preserve-3d on the group, which
          // mix-blend-mode flattens, so each copy carries the perspective itself. See the
          // header for what that does to the vanishing point.
          function parentPerspective(el) {
            var value = el.parentNode ? getComputedStyle(el.parentNode).perspective : "none";
            return value && value !== "none" ? "perspective(" + value + ") " : "";
          }

          function attachOne(el) {
            var group = document.createElement("div");
            group.setAttribute("data-hf-motion-blur-group", "hf-mb-" + window._hfMbUid++);
            group.style.cssText =
              "position:absolute;left:0;top:0;width:0;height:0;isolation:isolate;pointer-events:none;display:none;";

            var clones = [];
            for (var k = 0; k < copies; k++) {
              var clone = el.cloneNode(true);
              clone.removeAttribute("id");
              stripCopyAttrs(clone);
              clones.push(clone);
              group.appendChild(clone);
            }
            var s = {
              el: el,
              group: group,
              clones: clones,
              samples: [],
              perspective: "",
              watch: null,
            };

            // Resolved styles and the parent's perspective are px once read, so a
            // container-relative element needs them again when its box changes. Per frame
            // that would walk the whole subtree once per copy; on resize it costs nothing
            // on a fixed-size render and keeps a live preview honest.
            function snapshot() {
              var styles = resolvedStyles(el, []);
              s.perspective = parentPerspective(el);
              for (var c = 0; c < clones.length; c++) {
                paintResolvedStyles(clones[c], styles, { i: 0 });
                clones[c].style.position = "absolute";
                clones[c].style.margin = "0";
                clones[c].style.opacity = alpha;
                clones[c].style.mixBlendMode = "plus-lighter";
              }
            }

            // Snapshot BEFORE the group enters the page, so a throw in the style walk leaves
            // nothing behind: the record the rollback needs does not exist until it returns.
            snapshot();
            el.parentNode.insertBefore(group, el);
            if (typeof ResizeObserver === "function") {
              s.watch = new ResizeObserver(snapshot);
              s.watch.observe(el);
            }
            return s;
          }

          var state = [];
          // Every element this call marked. A throw inside `attachOne` never returns its
          // record, so `state` alone cannot give the marks back.
          var claimed = [];
          try {
            for (var q = 0; q < targets.length; q++) {
              var candidate = targets[q];
              // One group per element, whether a second call names it or one call names it
              // twice: a second set of copies over the first would double the ink. Marked
              // BEFORE the copies go in: inserting them runs custom-element reactions
              // synchronously, and one that registers a timeline re-enters the write trap.
              if (window._hfMbAttached.has(candidate)) continue;
              window._hfMbAttached.add(candidate);
              window._hfMbTimeline.set(candidate, tl);
              claimed.push(candidate);
              state.push(attachOne(candidate));
            }
          } catch (e) {
            unmark(claimed);
            discard(state);
            throw e;
          }
          // Nothing to blur means nothing to seek: a tracker here would run the whole sample
          // loop every frame over an empty set.
          if (state.length === 0) return;

          // One seek loop drives the whole call, so the window is ONE length, and it belongs
          // to the composition of an element this call actually attached.
          var fps = resolveFps(opts.fps, state[0].el);
          for (var d = 1; d < state.length; d++) {
            if (resolveFps(opts.fps, state[d].el) === fps) continue;
            var line = "one call cannot blur compositions at different frame rates; using ";
            console.warn("[motion-blur] " + line + fps, state[d].el);
            break;
          }

          function readTransform(el) {
            var cs = getComputedStyle(el);
            return {
              css: cs.transform,
              origin: cs.transformOrigin,
              opacity: cs.opacity,
              parsed: parseTransform(cs.transform),
            };
          }

          var scheduled = false;

          function applyShutter() {
            var shutterTime = shutterAngle / 360 / fps;
            if (!(shutterTime > 0)) {
              state.forEach(function (s) {
                s.group.style.display = "none";
              });
              return;
            }

            var t0 = tl.time();
            var duration = tl.duration();
            var windowStart = t0 + shutterPhase / 360 / fps;

            // Sample the real trajectory: seek to each sub-frame time with events
            // suppressed (so no tween callbacks, including this tracker's, fire),
            // read the resolved transform, then restore the frame time.
            try {
              for (var k = 0; k < copies; k++) {
                var tk = windowStart + (k / samples) * shutterTime;
                tl.time(Math.min(duration, Math.max(0, tk)), true);
                state.forEach(function (s) {
                  s.samples[k] = readTransform(s.el);
                });
              }
            } finally {
              tl.time(t0, true);
            }

            state.forEach(function (s) {
              var current = readTransform(s.el);
              var moved = false;
              for (var i = 0; i < copies; i++) {
                if (differs(s.samples[i].parsed, current.parsed)) {
                  moved = true;
                  break;
                }
              }
              if (!moved) {
                s.group.style.display = "none";
                return;
              }

              // The copies are absolutely positioned inside the group, and the group sits at
              // the origin of the element's own containing block, so the element's offset box
              // places them. Re-read every frame: a beat is free to move the box itself.
              var left = s.el.offsetLeft + "px";
              var top = s.el.offsetTop + "px";
              var width = s.el.offsetWidth + "px";
              var height = s.el.offsetHeight + "px";
              for (var j = 0; j < copies; j++) {
                var clone = s.clones[j];
                clone.style.left = left;
                clone.style.top = top;
                clone.style.width = width;
                clone.style.height = height;
                clone.style.transformOrigin = s.samples[j].origin;
                clone.style.transform =
                  s.perspective + (s.samples[j].css === "none" ? "" : s.samples[j].css);
              }
              // The copies are the element's own ink, so they have to carry its opacity too:
              // a beat that moves and fades at once would otherwise leave a full-strength
              // smear behind a vanishing element. It rides the group, not the copies, whose
              // own opacity is the 1/N shutter weight.
              s.group.style.opacity = current.opacity;
              s.group.style.display = "";
            });
          }

          // tl.eventCallback("onUpdate") is unavailable under the HyperFrames runtime proxy, so a
          // tracker tween's onUpdate fires on every seek. Sampling is deferred to a microtask:
          // seeking GSAP from inside its own render reads stale tween state, while the microtask
          // runs after the seek returns and before the frame is captured or painted.
          var _proxy = { t: 0 };
          try {
            tl.to(
              _proxy,
              {
                t: 1,
                duration: Math.max(tl.duration(), 0.1),
                ease: "none",
                onUpdate: function () {
                  if (scheduled) return;
                  scheduled = true;
                  Promise.resolve().then(function () {
                    scheduled = false;
                    applyShutter();
                  });
                },
              },
              0,
            );
          } catch (e) {
            unmark(claimed);
            discard(state);
            throw e;
          }
        };

        // An empty attribute means defaults; anything else is a JSON options object. A value that
        // is not an options object is skipped loudly rather than read as defaults, because a typo
        // in it would otherwise render as a silently unblurred element.
        function sweepOptions(el) {
          var text = (el.getAttribute(SWEEP_ATTR) || "").trim();
          if (text === "") return {};
          var parsed = null;
          try {
            parsed = JSON.parse(text);
          } catch (e) {
            return refuse(el, "is not JSON: " + text);
          }
          // `null`, a number and a string all parse. None of them is a set of options.
          if (parsed === null || typeof parsed !== "object" || Array.isArray(parsed)) {
            return refuse(el, "is not a JSON object: " + text);
          }
          var bad = unknownKey(parsed);
          if (bad !== null) return refuse(el, "names no such option: " + bad);
          var wrong = nonNumber(parsed);
          if (wrong !== null) return refuse(el, "needs a number for " + wrong);
          return parsed;
        }

        // A misspelled key is the likeliest typo in a JSON object, and reading it as
        // defaults is the silent no-op this attribute exists to remove.
        function unknownKey(parsed) {
          for (var key in parsed) {
            if (OPTION_KEYS.indexOf(key) < 0) return key;
          }
          return null;
        }

        // A key with a value the shutter cannot use is the same silent no-op as a key it does
        // not know: a non-numeric angle hides the smear, a non-numeric phase parks every copy
        // at the timeline's start. JSON gives real numbers, so anything else is a typo.
        function nonNumber(parsed) {
          for (var i = 0; i < OPTION_KEYS.length; i++) {
            var held = parsed[OPTION_KEYS[i]];
            if (held === undefined) continue;
            if (typeof held !== "number" || !Number.isFinite(held)) return OPTION_KEYS[i];
          }
          return null;
        }

        // A throw partway through an attach leaves an element blurred by nothing, so the copies
        // go too, along with the observer that would otherwise keep walking a detached subtree
        // on every resize of an element nothing blurs.
        // The mark is what a second trigger reads, so it is the first thing to give back.
        function unmark(els) {
          for (var i = 0; i < els.length; i++) {
            window._hfMbAttached.delete(els[i]);
            window._hfMbTimeline.delete(els[i]);
          }
        }

        function discard(state) {
          for (var i = 0; i < state.length; i++) {
            var s = state[i];
            if (s.watch !== null) s.watch.disconnect();
            if (s.group.parentNode !== null) s.group.parentNode.removeChild(s.group);
          }
        }

        function refuse(el, why) {
          window._hfMbSkipped.add(el);
          console.warn("[motion-blur] " + SWEEP_ATTR + " " + why, el);
          return null;
        }

        // An element belongs to the nearest composition above it, so a sub-composition's
        // targets follow that sub-composition's own timeline.
        function compositionOf(el) {
          var host = el.closest("[data-composition-id]");
          return host ? host.getAttribute("data-composition-id") : null;
        }

        // Anything else registered on the container is somebody else's bookkeeping: a
        // timeline is the thing this snippet can seek and extend.
        function isTimeline(value) {
          return !!value && typeof value.time === "function" && typeof value.to === "function";
        }

        // Attached, or skipped as unparseable. Both are terminal, so a later trigger must not
        // report or attach the element twice.
        function handled(el) {
          return window._hfMbAttached.has(el) || window._hfMbSkipped.has(el);
        }

        // The timeline registered for an element's own composition, or null. Read from the
        // registry rather than taken from whoever wrote it, so every trigger agrees.
        function timelineFor(el) {
          var id = compositionOf(el);
          if (id === null) return null;
          var registry = window.__timelines;
          var found = registry ? registry[id] : null;
          return isTimeline(found) ? found : null;
        }

        // A marked element whose parent is not an Element has no target above it: the parent
        // of a root is the Document, which has no `closest`.
        function nestedInTarget(el) {
          var parent = el.parentNode;
          if (parent === null || typeof parent.closest !== "function") return false;
          return parent.closest(SWEEP_SELECTOR) !== null;
        }

        // One owner of attaching one element. Answers whether the element still needs a trigger.
        function claim(el) {
          var tl = timelineFor(el);
          if (handled(el)) {
            var owner = window._hfMbTimeline.get(el);
            // Re-registering a key with a DIFFERENT timeline leaves the copies driven by the one
            // nobody seeks, which renders sharp and says nothing. Report it rather than guess.
            var changed = tl !== null && owner !== undefined && owner !== tl;
            if (changed && !window._hfMbWarned.has(el)) {
              window._hfMbWarned.add(el);
              console.warn(
                "[motion-blur] a second timeline registered for this element; the copies still follow the first",
                el,
              );
            }
            return true;
          }
          // Its group would be inserted into the live outer element, so the outer target's
          // style replay would walk a subtree its cursor no longer matches.
          if (nestedInTarget(el)) {
            refuse(el, "cannot blur a target inside another target; blur one of them");
            return true;
          }
          var opts = sweepOptions(el);
          if (opts === null) return true;
          if (tl === null) return false;
          window.attachMotionBlur(el, tl, opts);
          return true;
        }

        // Returns the elements still waiting for their composition to register a timeline.
        // The trap below runs this INSIDE the author's registration statement, so one bad
        // target must not abort the rest of their composition script.
        function sweep() {
          var pending = [];
          document.querySelectorAll(SWEEP_SELECTOR).forEach(function (el) {
            try {
              if (!claim(el)) pending.push(el);
            } catch (e) {
              window._hfMbSkipped.add(el);
              console.warn("[motion-blur] could not blur this element: " + e, el);
            }
          });
          return pending;
        }

        // Registering a timeline is the moment the author has finished building it, so trapping
        // the write attaches before the renderer captures a frame. A microtask would be too
        // early: it runs before the next `<script>` tag.
        function registrationProxy(container) {
          var proxy = new Proxy(container, {
            set: function (target, key, value) {
              target[key] = value;
              if (typeof key === "string") sweep();
              return true;
            },
          });
          window._hfMbProxies.add(proxy);
          return proxy;
        }

        function hookRegistration() {
          var held = window.__timelines;
          Object.defineProperty(window, "__timelines", {
            configurable: true,
            enumerable: true,
            get: function () {
              return held;
            },
            set: function (value) {
              var container = !!value && typeof value === "object";
              var fresh = container && !window._hfMbProxies.has(value);
              held = fresh ? registrationProxy(value) : value;
              if (fresh) sweep();
            },
          });
          // A container assigned before this snippet ran is replayed through the setter, so a
          // timeline already registered on it is swept too.
          if (held !== undefined) window.__timelines = held;
        }

        // The trap above cannot see every registration: the runtime owns the registry object,
        // wraps it per sub-composition, and mounts nested compositions asynchronously. So the
        // registry is also POLLED, which needs no cooperation from whoever writes it.
        function poll(ticks) {
          var pending = sweep();
          // The WHOLE budget, every time. Stopping the first tick nothing is pending kills the
          // poll one tick into an ordinary page, which is before a late composition arrives.
          if (ticks > 0) {
            setTimeout(function () {
              poll(ticks - 1);
            }, POLL_MS);
            return;
          }
          if (pending.length === 0) return;
          var count = pending.length + " element(s) carry " + SWEEP_ATTR;
          console.warn(
            "[motion-blur] " + count + ", and no composition registered a timeline for them",
            pending,
          );
        }

        if (!window._hfMbHooked) {
          window._hfMbHooked = true;
          hookRegistration();
          poll(POLL_TICKS);
        }
        /* SHUTTER_SNIPPET_END */
      })();
    </script>

    <!--
      Timeline integration example:

      <div id="root" data-composition-id="my-composition" data-duration="6" data-fps="30">
        <div id="my-box" data-hf-motion-blur></div>
        <div id="my-title" data-hf-motion-blur='{"shutterAngle": 360}'></div>
      </div>

      const tl = gsap.timeline({ paused: true });

      tl.fromTo("#my-box", { x: -100 }, { x: 1700, duration: 1.2, ease: "power3.inOut" }, 0.5);

      // Extend to data-duration so seeks past the last tween reach the blur callback.
      tl.set(document.body, {}, DATA_DURATION);

      // The registration below is what attaches both targets, in that order.
      window.__timelines = window.__timelines || {};
      window.__timelines["my-composition"] = tl;

      // Only for an element created later than the polling window above:
      attachMotionBlur("#late-box", tl, { shutterAngle: 720, samplesPerFrame: 16 });
    -->
    ```
  </CatalogSlot>

  <CatalogSlot slot="install">
    <InstallCommand command="npx hyperframes add motion-blur" item="motion-blur" />

    That writes one file: `compositions/components/motion-blur.html`.
  </CatalogSlot>

  <CatalogSlot slot="docs">
    ## Usage

    Paste the snippet into your composition, then put `data-hf-motion-blur` on any element your timeline animates. Nothing else to call, and no order to get wrong.

    ```html theme={null}
    <div id="root" data-composition-id="my-composition" data-duration="4" data-fps="30">
      <!-- Defaults: a two-frame shutter at 16 sub-intervals. -->
      <div id="my-box" data-hf-motion-blur></div>

      <!-- Or a JSON object of options. An unknown name, or a value that is not a
           number, is refused by name rather than read as defaults. -->
      <div id="my-title" data-hf-motion-blur='{"shutterAngle": 360, "samplesPerFrame": 8}'></div>
    </div>
    ```

    The element finds its own timeline: its nearest `[data-composition-id]` ancestor names the key, and the snippet reads `window.__timelines[key]`. An element whose composition never registers a timeline says so in the console instead of rendering sharp in silence.

    `attachMotionBlur()` stays available for a target built after the page has settled. It has an ordering contract the attribute does not: call it after every tween is defined, so the timeline's final duration is known.

    ```html theme={null}
    <!-- Extend the timeline to data-duration before calling attachMotionBlur -->
    tl.set(document.body, {}, DATA_DURATION);

    attachMotionBlur("#late-box", tl, {
      shutterAngle: 720,   // degrees of the frame interval the shutter is open
      samplesPerFrame: 16, // sub-intervals of the window; 17 duplicates at 1/16 each
    });
    ```

    ## How it works

    This is the After Effects layer Motion Blur model — temporal supersampling — synthesised inside the page, because the renderer captures one instant per frame with no shutter.

    1. **Sample the trajectory** — after every timeline seek, the snippet seeks the timeline (events suppressed) to one sub-frame time per window boundary, reads each target's resolved `transform` matrix, then restores the frame time. Reading the resolved matrix rather than a list of named GSAP properties is what makes every driver work: translation, scale, rotation, 3D rotation and skew all arrive in the same one value. The window is `shutterAngle / 360 / fps` seconds long and starts `shutterPhase / 360 / fps` seconds from the frame time; `samplesPerFrame` divides it into that many sub-intervals, so there are `samplesPerFrame + 1` samples and both ends of the window carry one.
    2. **Add the duplicates** — each target gets a group of DOM copies of itself, one per sample, each carrying that sample's transform at `1/N` opacity with `mix-blend-mode: plus-lighter`. plus-lighter adds premultiplied colour, so N + 1 copies at 1/N sum to the average, which is the shutter integral. The group sets `isolation: isolate`, and that is load-bearing rather than tidy: without a transparent backdrop of its own the first copy would add onto the page and blow a light background out to white. A solid translating at speed `v` becomes a box smear of length `v × shutterTime`, centred on its instantaneous position — no one-sided trail and no Gaussian halo. No single duplicate exceeds `1/N`, so the tails step down evenly; where the element travels less than its own size the copies overlap past 1 and clamp, leaving the middle solid rather than a plateau.
    3. **Composite the sharp instance on top** — the element is then drawn over the smear at full opacity, so the position the frame is actually at stays crisp and only the duplicates are faint. This is the single largest difference from a plain average, and the one that makes the result read like After Effects rather than like a long exposure.
    4. **Rest is sharp** — when every sampled transform collapses onto the current one, the group is hidden and the element renders unblurred. The group also carries the element's own opacity, so a beat that moves and fades at once fades its smear with it.

    The defaults come from measurement, not from the After Effects UI's nominal values. On a 1920×1080 / 30 fps export of translating text, the outermost duplicate on each side sits exactly one frame away from the frame time, with 8 evenly spaced duplicates between it and the centre — a 720° window at −360° phase, divided into 16. The staircase across a stroke steps by 0.063 ± 0.002 of the sharp text intensity per duplicate: flat 1/16, no taper toward the window edges. Replaying that export through this component scores 32.5 dB mean PSNR against it (min 27.6 over the 72 translating frames), against 24.2 dB (min 17.1) for the previous half-frame centred window.

    Copies follow the real trajectory, so eased and curved motion smear correctly, and every property that reaches `transform` drives the smear on its own: a beat that only scales or only turns blurs exactly as a beat that only translates does. A 3D beat reads its perspective off the element's parent and applies it per copy, because `mix-blend-mode` flattens `preserve-3d` and a copy therefore cannot inherit the parent's 3D context. Transformed ancestors are still not compensated. A copy drops the element's id but keeps its classes, so after attaching, address the element by id or by reference rather than by a class the copies also carry.

    ## Options

    | Option            | Default                    | Description                                                                                                                                                                                                        |
    | ----------------- | -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
    | `shutterAngle`    | `720`                      | Degrees of the frame interval the shutter is open. `720` spans two frames, the width measured off the After Effects reference; `360` spans one; `0` disables the blur                                              |
    | `shutterPhase`    | `-360`                     | Degrees offset of the window start from the frame time. `-360` starts the window one frame back, which with a 720° angle centres it on the frame                                                                   |
    | `samplesPerFrame` | `16`                       | Sub-intervals of the shutter window (2–64), so `N + 1` duplicates at `1/N` opacity each. More sub-intervals close the gaps between duplicates at high speed, at the cost of one more copy of the element per frame |
    | `fps`             | root `data-fps`, else `30` | Composition frame rate. Pass it explicitly when rendering with an fps override (`hyperframes render --fps`)                                                                                                        |

    Tagged `effect` `motion-blur` `shutter` `after-effects` `velocity` `animation`.

    ## Related topics

    * [Browse the complete Catalog](/catalog)
    * [Add assets and Catalog items in Studio](/studio/assets-and-blocks)
    * [Build a richer composition](/go-further)
  </CatalogSlot>
</CatalogDetail>