Tilt Card

<!--
  Tilt Card - transitions.dev-inspired primitive for HyperFrames.

  Paste the markup, CSS and script into a composition. Use the timeline
  integration note at the bottom as the starting point for deterministic GSAP
  animation.

  Variables. The script reads each one, falls back to the declared default on
  anything missing or unrecognised, and writes the result into the markup or
  into a custom property the CSS above consumes. The timeline recipe below is
  untouched by them: it keeps driving the same rise and the same tilt angles.

    - eyebrow (string, default "Primitive"): the small uppercase kicker above
      the headline. Blank falls back to the default.
    - headline (string, default "Agent-ready motion"): the large card
      headline. Blank falls back to the default.
    - glow (tight | standard | wide, default standard): how far the corner
      glow reaches past the card edges. A wider glow spreads more light at
      rest, and because the timeline drifts it by a percentage of its own box,
      a wider glow also carries that drift further across the card.
    - accent (indigo | emerald | violet, default indigo): the colour family of
      the card, covering the gradient, the corner glow, the eyebrow and the
      drop shadow together.

  On every default the result is identical to the original: an indigo card with
  a sky-blue corner glow reaching 30% past every edge.
-->

<div
  class="hf-transition-tilt-card"
  data-composition-variables='[
    {"id": "eyebrow", "type": "string", "role": "content", "label": "Eyebrow", "description": "Small uppercase kicker above the headline.", "default": "Primitive"},
    {"id": "headline", "type": "string", "role": "content", "label": "Headline", "description": "Large card headline.", "default": "Agent-ready motion"},
    {"id": "glow", "type": "enum", "role": "motion", "label": "Glow", "description": "How far the corner glow reaches past the card edges, which sets both its spread at rest and how far the timeline drift carries it.", "default": "standard", "options": [{"value": "tight", "label": "Tight"}, {"value": "standard", "label": "Standard"}, {"value": "wide", "label": "Wide"}]},
    {"id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Colour family of the card gradient, corner glow, eyebrow and drop shadow.", "default": "indigo", "options": [{"value": "indigo", "label": "Indigo"}, {"value": "emerald", "label": "Emerald"}, {"value": "violet", "label": "Violet"}]}
  ]'
>
  <div class="hf-transition-tilt-glow"></div>
  <div class="hf-transition-tilt-content">
    <span>Primitive</span>
    <strong>Agent-ready motion</strong>
  </div>
</div>

<style>
  .hf-transition-tilt-card {
    position: relative;
    width: 420px;
    height: 260px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 30px;
    background: linear-gradient(135deg, #18181b, var(--hf-tilt-accent, #312e81));
    color: #ffffff;
    font-family: Inter, system-ui, sans-serif;
    transform-style: preserve-3d;
    box-shadow: 0 32px 90px var(--hf-tilt-shadow, rgba(49, 46, 129, 0.34));
  }
  .hf-transition-tilt-glow {
    position: absolute;
    inset: var(--hf-tilt-glow-inset, -30%);
    background: radial-gradient(
      circle at 30% 20%,
      var(--hf-tilt-glow, rgba(125, 211, 252, 0.5)),
      transparent 36%
    );
  }
  .hf-transition-tilt-content {
    position: relative;
    display: grid;
    align-content: end;
    gap: 10px;
    height: 100%;
    padding: 34px;
    transform: translateZ(38px);
  }
  .hf-transition-tilt-content span {
    color: var(--hf-tilt-label, #a5b4fc);
    font-size: 13px;
    font-weight: 900;
    letter-spacing: 0.12em;
    text-transform: uppercase;
  }
  .hf-transition-tilt-content strong {
    max-width: 280px;
    font-size: 34px;
    line-height: 0.96;
  }
</style>

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

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

    // Unrecognised overrides return to their declared defaults.
    var insets = { tight: "-18%", standard: "-30%", wide: "-46%" };
    var accents = {
      indigo: {
        accent: "#312e81",
        glow: "rgba(125, 211, 252, 0.5)",
        label: "#a5b4fc",
        shadow: "rgba(49, 46, 129, 0.34)",
      },
      emerald: {
        accent: "#065f46",
        glow: "rgba(110, 231, 183, 0.5)",
        label: "#6ee7b7",
        shadow: "rgba(6, 95, 70, 0.34)",
      },
      violet: {
        accent: "#5b21b6",
        glow: "rgba(216, 180, 254, 0.5)",
        label: "#d8b4fe",
        shadow: "rgba(91, 33, 182, 0.34)",
      },
    };

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

    function text(value, fallback) {
      var resolved = value == null ? "" : String(value).trim();
      return resolved.length > 0 ? resolved : fallback;
    }

    var eyebrow = text(vars.eyebrow, "Primitive");
    var headline = text(vars.headline, "Agent-ready motion");
    var inset = insets[pick(insets, vars.glow, "standard")];
    var accent = accents[pick(accents, vars.accent, "indigo")];

    var roots = document.querySelectorAll(".hf-transition-tilt-card");
    for (var i = 0; i < roots.length; i += 1) {
      var root = roots[i];
      root.style.setProperty("--hf-tilt-glow-inset", inset);
      root.style.setProperty("--hf-tilt-accent", accent.accent);
      root.style.setProperty("--hf-tilt-glow", accent.glow);
      root.style.setProperty("--hf-tilt-label", accent.label);
      root.style.setProperty("--hf-tilt-shadow", accent.shadow);
      root.querySelector(".hf-transition-tilt-content span").textContent = eyebrow;
      root.querySelector(".hf-transition-tilt-content strong").textContent = headline;
    }
  })();
</script>

<!--
  Timeline integration:
  tl.fromTo('.hf-transition-tilt-card', { opacity: 0, y: 30, rotateX: 0, rotateY: 0 }, { opacity: 1, y: 0, duration: 0.38, ease: 'power2.out' }, 0.3);
  tl.to('.hf-transition-tilt-card', { rotateX: -7, rotateY: 10, duration: 0.72, ease: 'power3.inOut' }, 0.75);
  tl.to('.hf-transition-tilt-glow', { xPercent: 12, yPercent: 10, duration: 0.72, ease: 'power3.inOut' }, 0.75);
-->