Shared Axis Z

<!--
  Shared Axis Z - remocn typography primitive for HyperFrames.

  Paste the markup, CSS and script into a composition. Drive the timeline
  integration from a paused GSAP timeline so renders remain deterministic.

  Variables. The script reads each one, falls back to the declared default on
  anything missing or unrecognised, and writes the result as a custom property
  the CSS above consumes. The timeline recipe below is untouched by them: it
  keeps driving one scale from 0.72 to 1, and these decide how far from the
  final size that start really sits. At rest the scale is 1, so every setting
  lands on the same final frame.

    - direction (in | out, default in): which way the words travel along the
      z axis. in swells up from a smaller start, out settles down from a
      larger one.
    - depth (shallow | standard | deep, default standard): scales the gap
      between the start size and the final size. shallow covers half the run,
      deep nearly double, in the same time.
    - tone (ink | paper | accent, default ink): word colour. ink is near-black
      for light frames, paper near-white for dark ones, accent rides --brand.

  On every default the result is identical to the original: words swell from
  0.72 to full size in near-black.
-->

<div
  class="hf-remocn-shared-axis-z"
  data-composition-variables='[
    { "id": "direction", "type": "enum", "role": "motion", "label": "Direction", "description": "Which way the words travel along the z axis: in swells up from small, out settles down from large.", "default": "in", "options": [{ "value": "in", "label": "In" }, { "value": "out", "label": "Out" }] },
    { "id": "depth", "type": "enum", "role": "motion", "label": "Depth", "description": "Scales how far the words start from their final size, so the push covers a shorter or longer run in the same time.", "default": "standard", "options": [{ "value": "shallow", "label": "Shallow" }, { "value": "standard", "label": "Standard" }, { "value": "deep", "label": "Deep" }] },
    { "id": "tone", "type": "enum", "role": "style", "label": "Tone", "description": "Word colour: ink for light frames, paper for dark ones, accent rides --brand.", "default": "ink", "options": [{ "value": "ink", "label": "Ink" }, { "value": "paper", "label": "Paper" }, { "value": "accent", "label": "Accent" }] }
  ]'
>
  <span>Zoom</span><span>context</span>
</div>

<style>
  .hf-remocn-shared-axis-z {
    color: var(--hf-word-color, #18181b);
    font-family: Inter, system-ui, sans-serif;
    font-weight: 900;
    letter-spacing: -0.04em;
  }
  .hf-remocn-shared-axis-z {
    display: inline-flex;
    gap: 12px;
    font-size: 56px;
    line-height: 1;
  }
  .hf-remocn-shared-axis-z span {
    display: inline-block;
    transform: translate(var(--hf-word-x, 0px), var(--hf-word-y, 0px))
      scale(calc(1 + (var(--hf-word-scale, 1) - 1) * var(--hf-word-depth, 1)));
    filter: blur(var(--hf-word-blur, 0px));
    will-change: transform, filter, opacity;
  }
</style>

<script>
  (function () {
    "use strict";

    var vars =
      window.__hyperframes && window.__hyperframes.getVariables
        ? window.__hyperframes.getVariables()
        : {};

    // Unrecognised overrides return to their declared defaults.
    var signs = { in: 1, out: -1 };
    var reaches = { shallow: 0.5, standard: 1, deep: 1.85 };
    var tones = {
      ink: "#18181b",
      paper: "#fafafa",
      accent: "var(--brand, #34d399)",
    };

    function pick(table, value, fallback) {
      return Object.prototype.hasOwnProperty.call(table, value) ? value : fallback;
    }

    var sign = signs[pick(signs, vars.direction, "in")];
    var reach = reaches[pick(reaches, vars.depth, "standard")];
    var tone = tones[pick(tones, vars.tone, "ink")];

    var roots = document.querySelectorAll(".hf-remocn-shared-axis-z");
    for (var i = 0; i < roots.length; i += 1) {
      roots[i].style.setProperty("--hf-word-depth", String(sign * reach));
      roots[i].style.setProperty("--hf-word-color", tone);
    }
  })();
</script>

<!--
  Timeline integration:
  tl.fromTo('.hf-remocn-shared-axis-z span', { opacity: 0, '--hf-word-scale': 0.72 }, { opacity: 1, '--hf-word-scale': 1, duration: 0.34, stagger: 0.06, ease: 'back.out(1.8)' }, startTime);
-->