> ## Documentation Index
> Fetch the complete documentation index at: /llms.txt
> Use this file to discover all available pages before exploring further.

# Aurora Drift

> Three soft accent-derived aurora fields drift in an exact ambient loop over a deep base and faint vignette.

# Aurora Drift

Three soft accent-derived aurora fields drift in an exact ambient loop over a deep base and faint vignette.

**Aurora Drift**

```html aurora-drift.html theme={null}
<!doctype html>
<!--
  aurora-drift: HyperFrames video primitive (backgrounds / ambient)

  Concept: three oversized, softly blurred accent-derived fields drift over
  a deep base beneath a faint vignette. The motion stays slow and restrained,
  giving a scene color and depth without competing with foreground content.

  Variables:
    - accent (green | blue | violet, default green): selects the source token
      from which the three related aurora hues are mixed.
    - mood (deep | bright, default deep): controls base luminance and field
      strength while preserving the same motion.

  Envelope: IN = 0, HOLD = the full elastic duration, OUT = 0. The phase proxy
  advances through exactly one whole sine cycle during HOLD. A longer mount
  stretches only that ambient cycle.

  Loop invariant: phase 2 * PI is normalized to phase 0 before any transform
  is calculated, so every blob has exactly the same pose at t=0 and t=duration.

  Sound: none.

  Mount contract: the runtime clones only this template. #root fills the host
  box, establishes the container query basis, has no data-width or data-height,
  and registers one paused timeline under the hardcoded aurora-drift id.
-->
<html
  lang="en"
  data-composition-id="aurora-drift"
  data-composition-duration="4"
  data-composition-variables='[
    { "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Accent token family used to derive the aurora hues.", "default": "green", "options": [{ "value": "green", "label": "Green" }, { "value": "blue", "label": "Blue" }, { "value": "violet", "label": "Violet" }] },
    { "id": "mood", "type": "enum", "role": "style", "label": "Mood", "description": "Base luminance and aurora field strength.", "default": "deep", "options": [{ "value": "deep", "label": "Deep" }, { "value": "bright", "label": "Bright" }] }
  ]'
>
  <head>
    <meta charset="UTF-8" />
    <title>Aurora Drift</title>
  </head>
  <body>
    <template>
      <div id="root" data-composition-id="aurora-drift" data-duration="4" data-fps="30">
        <style>
          *,
          *::before,
          *::after {
            box-sizing: border-box;
          }

          #root {
            position: absolute;
            inset: 0;
            overflow: hidden;
            container-type: size;
            isolation: isolate;
            pointer-events: none;
          }

          .ad-clip,
          .ad-base,
          .ad-vignette {
            position: absolute;
            inset: 0;
          }

          .ad-clip {
            overflow: hidden;
          }

          .ad-base {
            background:
              radial-gradient(
                ellipse at 50% 42%,
                color-mix(in srgb, var(--ad-color) 8%, var(--ad-base)) 0%,
                var(--ad-base) 68%
              ),
              var(--ad-base);
          }

          .ad-blob {
            --ad-blob-opacity: 1;
            position: absolute;
            display: block;
            border-radius: 50%;
            filter: blur(12cqmin) saturate(0.84) opacity(var(--ad-blob-opacity));
            mix-blend-mode: screen;
            opacity: var(--ad-strength);
            will-change: transform;
          }

          .ad-blob-a {
            width: 76cqw;
            height: 72cqh;
            left: -18cqw;
            top: -22cqh;
            background: radial-gradient(
              ellipse at center,
              color-mix(in srgb, var(--ad-color) 88%, white) 0%,
              color-mix(in srgb, var(--ad-color) 42%, transparent) 48%,
              transparent 76%
            );
          }

          .ad-blob-b {
            width: 84cqw;
            height: 78cqh;
            right: -28cqw;
            top: -2cqh;
            --ad-blob-opacity: 0.82;
            background: radial-gradient(
              ellipse at center,
              color-mix(in srgb, var(--ad-color) 72%, var(--accent, #38bdf8)) 0%,
              color-mix(in srgb, var(--ad-color) 36%, transparent) 52%,
              transparent 78%
            );
          }

          .ad-blob-c {
            width: 72cqw;
            height: 74cqh;
            left: 18cqw;
            bottom: -34cqh;
            --ad-blob-opacity: 0.68;
            background: radial-gradient(
              ellipse at center,
              color-mix(in srgb, var(--ad-color) 72%, var(--accent-2, #a78bfa)) 0%,
              color-mix(in srgb, var(--ad-color) 32%, transparent) 50%,
              transparent 76%
            );
          }

          .ad-vignette {
            background: radial-gradient(
              ellipse at center,
              transparent 35%,
              rgb(0 0 0 / var(--ad-vignette)) 100%
            );
          }
        </style>

        <div
          id="aurora-drift-clip"
          class="ad-clip clip"
          data-start="0"
          data-duration="4"
          data-track-index="0"
        >
          <div class="ad-base"></div>
          <div class="ad-blob ad-blob-a"></div>
          <div class="ad-blob ad-blob-b"></div>
          <div class="ad-blob ad-blob-c"></div>
          <div class="ad-vignette"></div>
        </div>

        <script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
        <script>
          (function () {
            "use strict";

            var root = document.getElementById("root");
            var vars =
              window.__hyperframes && window.__hyperframes.getVariables
                ? window.__hyperframes.getVariables()
                : {};

            // Invalid enum overrides return to their declared defaults.
            var accentTokens = {
              green: "var(--brand, #34d399)",
              blue: "var(--accent, #38bdf8)",
              violet: "var(--accent-2, #a78bfa)",
            };
            var moodStyles = {
              deep: { base: "#050711", strength: "0.42", vignette: "0.62" },
              bright: { base: "#111827", strength: "0.56", vignette: "0.46" },
            };
            var accent = Object.prototype.hasOwnProperty.call(accentTokens, vars.accent)
              ? vars.accent
              : "green";
            var mood = vars.mood === "bright" ? "bright" : "deep";
            var moodStyle = moodStyles[mood];

            root.style.setProperty("--ad-color", accentTokens[accent]);
            root.style.setProperty("--ad-base", moodStyle.base);
            root.style.setProperty("--ad-strength", moodStyle.strength);
            root.style.setProperty("--ad-vignette", moodStyle.vignette);

            var TAU = Math.PI * 2;
            var duration = Math.max(0.001, parseFloat(root.dataset.duration || "4"));
            var state = { phase: 0 };
            var paths = [
              { element: root.querySelector(".ad-blob-a"), offset: 0, x: 4.6, y: 3.2 },
              {
                element: root.querySelector(".ad-blob-b"),
                offset: TAU / 3,
                x: 4.1,
                y: 3.8,
              },
              {
                element: root.querySelector(".ad-blob-c"),
                offset: (TAU * 2) / 3,
                x: 3.6,
                y: 3,
              },
            ];

            function renderPose() {
              // The endpoint uses literal phase zero, avoiding the floating
              // point residue from Math.sin(2 * PI).
              var phase = state.phase === TAU ? 0 : state.phase;
              paths.forEach(function (path) {
                gsap.set(path.element, {
                  x: Math.sin(phase + path.offset) * path.x + "cqw",
                  y: Math.sin(phase + path.offset + Math.PI / 2) * path.y + "cqh",
                });
              });
            }

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

            // HOLD: uniform phase travel produces smooth sine motion. Exactly
            // one whole cycle is completed at the duration boundary.
            tl.to(state, { phase: TAU, duration: duration, ease: "none", onUpdate: renderPose }, 0);

            renderPose();
            tl.seek(0);

            window.__timelines = window.__timelines || {};
            window.__timelines["aurora-drift"] = tl;
          })();
        </script>
      </div>
    </template>
  </body>
</html>
```

Copy npx hyperframes add aurora-drift to the clipboard

That writes one file: `compositions/components/aurora-drift.html`.

## Paste it into your composition

Open `compositions/components/aurora-drift.html` and copy what is inside into your own composition.

A component has no size or duration of its own. It takes both from the composition
you paste it into.

## Variables

Every one of these has a default, so the piece works untouched. Set the ones you
want to change on the element:

| Variable | Default | Accepts | What it does |
| - | - | - | - |
| `accent` | `green` | `green`, `blue`, `violet` | Accent token family used to derive the aurora hues. |
| `mood` | `deep` | `deep`, `bright` | Base luminance and aurora field strength. |

Set them with `data-variable-values` on the element that mounts it. These are the
defaults, so this behaves exactly like the preview above until you change one:

```html wrap theme={null}
<div
  data-composition-id="aurora-drift"
  data-composition-src="compositions/components/aurora-drift.html"
  data-variable-values='{"accent":"green","mood":"deep"}'
></div>
```

Tagged `motion-primitive` `background` `aurora` `gradient` `ambient` `loopable`.

## Related topics

* [Browse the complete Catalog](/catalog.md)
* [Add assets and Catalog items in the browser editor](/studio/assets-and-blocks.md)
* [Put blocks together into one video](/concepts/compositions.md)


## Related topics

- [Aurora](/catalog/blocks/aurora.md)
- [Drift Hold](/catalog/components/drift-hold.md)
- [Colour, effects, 3D and generated art](/prompting/color-grading.md)


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