chore: import upstream snapshot with attribution

skills/hyperframes-creative/frame-presets/blockframe/FRAME.md

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+---
+version: alpha
+name: BlockFrame — Frame (video / frame layer)
+description: >
+  Video-first companion to BlockFrame's design.md. The unit is the frame (1920×1080). Atoms are
+  identical and sacred — 4px black borders + 8px hard offset shadows, the five-pastel candy palette
+  (pink/blue/green/yellow/cream) plus black/white/off-white, Inter 800–900 uppercase display +
+  Space Grotesk label chrome, square corners, label-pills, tilted decorations, star bursts, stripe
+  blocks, dot grids. Composition + frame scale rewritten. Motion out of scope.
+unit: the frame — 1920×1080 primary; 9:16 and 1:1 documented
+principle: atoms are sacred · composition is free · numbers come from the script
+
+colors:
+  black: "#000000"
+  white: "#FFFFFF"
+  offwhite: "#FFFDF5"
+  pink: "#FE90E8"
+  blue: "#C0F7FE"
+  green: "#99E885"
+  yellow: "#F7CB46"
+  cream: "#FFDC8B"
+
+borders: { primary: "4px solid black", thin: "3px solid black" }
+shadows: { default: "8px 8px 0 black", small: "4px 4px 0 black", hover: "6px 6px 0 black", close-yellow: "12px 12px 0 yellow", close-white: "6px 6px 0 white" }
+
+typography:
+  # — reading + chrome ramp —
+  body:    { fontFamily: "Inter", cqw: 0.95, weight: 500, lineHeight: 1.6 }
+  card-title:{ fontFamily: "Inter", cqw: 1.15, weight: 700, upper: true, lineHeight: 1.2 }
+  label:   { fontFamily: "Space Grotesk", px: 13, weight: 600, tracking: "0.08em", upper: true }
+  counter: { fontFamily: "Space Grotesk", px: 14, weight: 700, tracking: "0.1em", upper: true }
+  # — display ramp (Inter 800–900, uppercase, negative tracking) —
+  heading-md:{ fontFamily: "Inter", cqw: 2.1, weight: 700, lineHeight: 1.1, tracking: "-0.01em", upper: true }
+  quote-text:{ fontFamily: "Inter", cqw: 2.7, weight: 900, lineHeight: 1.15, tracking: "-0.02em", upper: true }
+  stat-number:{ fontFamily: "Inter", cqw: 3.3, weight: 900, lineHeight: 1.0 }
+  heading-lg:{ fontFamily: "Inter", cqw: 3.3, weight: 800, lineHeight: 1.0, tracking: "-0.02em", upper: true }
+  close-title:{ fontFamily: "Inter", cqw: 4.2, weight: 900, lineHeight: 0.95, tracking: "-0.03em", upper: true }
+  heading-xl:{ fontFamily: "Inter", cqw: 5.0, weight: 900, lineHeight: 0.95, tracking: "-0.03em", upper: true }
+
+spacing:
+  slide-pad: "3.1cqw"   # 60px @1920
+  gap-md: "1.7cqw"
+
+components:
+  card-elevated:
+    backgroundColor: "{colors.white}"
+    border: "0.4cqw solid {colors.black}"
+    rounded: "0"
+    shadow: "0.8cqw 0.8cqw 0 {colors.black}"
+    description: "Primary card. Border/shadow coupled: 4px↔8px, 3px↔4px."
+  card-small:
+    backgroundColor: "{colors.white}"
+    border: "0.3cqw solid {colors.black}"
+    rounded: "0"
+    shadow: "0.4cqw 0.4cqw 0 {colors.black}"
+    description: "Stat cards, team cards, timeline steps."
+  label-pill:
+    border: "0.3cqw solid {colors.black}"
+    backgroundColor: "any pastel / {colors.white}"
+    rounded: "9999px"
+    shadow: "0.4cqw 0.4cqw 0 {colors.black}"
+    typography: "{typography.label}"
+    description: "The universal eyebrow — never plain text."
+  button-primary:
+    backgroundColor: "{colors.yellow}"
+    textColor: "{colors.black}"
+    border: "0.3cqw solid {colors.black}"
+    rounded: "0"
+    shadow: "0.4cqw 0.4cqw 0 {colors.black}"
+    typography: "Inter 700"
+    description: "The CTA."
+  star-burst:
+    backgroundColor: "any pastel"
+    border: "0.3cqw solid {colors.black}"
+    clip: "10-point clip-path star"
+    description: "Corner attention-grabber."
+  stripe-block:
+    backgroundImage: "45° {colors.black} + pastel diagonal stripes"
+    border: "0.3cqw solid {colors.black}"
+    description: "Poster decoration."
+  bg-dot-grid:
+    backgroundImage: "radial-dot ~1.2px dots, 24px grid, {colors.black}"
+    description: "Faint corner/ground overlay."
+  tilt-deco:
+    transform: "rotate(±2°–12°)"
+    description: "Rotated rectangle/badge/star. Stat cards alternate −2/+2°. The grid-puncture signature."
+  stat-deco-dot:
+    backgroundColor: "any pastel"
+    border: "2px solid {colors.black}"
+    rounded: "50%"
+    size: "12px"
+    description: "The ONLY round shape, pinned to stat cards."
+  close-frame:
+    backgroundColor: "{colors.black}"
+    textColor: "{colors.white}"
+    border: "0.4cqw solid {colors.white}"
+    rounded: "0"
+    shadow: "1.2cqw 1.2cqw 0 {colors.yellow}"
+    description: "Inverted closer — the only colored shadow."
+---
+
+# BlockFrame — Frame (video / frame layer)
+
+## Overview
+
+BlockFrame at frame scale is a **maximalist neobrutalist** system on five laws: every region has a
+4px black border, every elevated element an 8px hard offset shadow, every corner square, every
+accent a saturated pastel, and every layout allowed to be a little crooked. The joy is the
+deliberate collision — bordered cards meeting bordered cards, shadows stacking, tilted decorations
+puncturing the grid.
+
+The voice is **Inter** at weight 800–900 in tight uppercase with negative tracking (display) +
+weight 500 sentence body, and **Space Grotesk** weight 600 uppercase 0.08em as the label/chrome
+voice. Five candy pastels (pink/blue/green/yellow/cream) cycle as full-bleed grounds across frames
+— the color cycling is the primary rhythm. Depth is **hard offset shadow** (8px/4px, solid black,
+zero blur, bottom-right); the close-frame's 12px yellow shadow is the one colored exception.
+
+**Key characteristics at frame scale:**
+
+- **4px black borders + 8px hard shadows** on primary cards; 3px + 4px on chrome (weights coupled).
+- **Five-pastel palette** cycled as full-bleed grounds; black/white/off-white structural.
+- **Inter 800–900 uppercase** negative-tracked display; **Space Grotesk** label chrome.
+- **Square corners** everywhere (only the stat-deco dot is round); **tilted decorations** puncture the grid.
+- **Label-pills** open every region; star bursts, stripe blocks, dot grids are reusable attention units.
+- **Comfortably dense** — packed reads as authoritative; empty corners read as broken.
+
+## The Frame
+
+### Frame Craft Bar
+
+Three eyeball tests gate every frame before any structural check:
+
+- **Squint** — one Inter display moment dominates at 3–6× its neighbor; cards read as a system, not rivals.
+- **Silence** — cover/quote/close keep air (decorations, not content); the **feature-card and stat grids are the dense exception**.
+- **Restraint** — the 4px→08px / 3px→4px coupling holds; black borders only (white on close); pastel ground **cycles** one per frame; no sixth pastel.
+- **Reference** — aim at a **zine / 1990s sticker-book / toy-packaging spread** (bordered blocks, tilted decorations); failure looks like a **flat, borderless, blurred-shadow web card grid**.
+
+- **Primary:** 1920×1080 (16:9). Display authored in **`cqw`** (`px ÷ 1920 × 100 = cqw`).
+- **Vertical:** 1080×1920 (9:16). **Square:** 1080×1080 (1:1).
+- **Safe area:** `slide-pad` ~3.1cqw; decorations may bleed off edges.
+
+**The container law (load-bearing).** Every frame ground sets `container-type: size`; ALL
+frame-relative units are `cqw`/`cqh` against it — never `vw`. Borders/shadows scale in `cqw` so the
+4px↔8px coupling holds proportionally; corners stay square.
+
+## Colors
+
+Tokens identical to the source. `{colors.offwhite}` is the default ground, but frames **cycle**
+through `{colors.cream}`/`blue`/`pink`/`green`/`yellow` grounds — the cycle is the rhythm.
+`{colors.black}` is every border + structural text; `{colors.white}` is card fills. The five pastels
+are interchangeable with **no semantic meaning** — pair by juxtaposition (pink+blue+green trio,
+cream+yellow warm pair). `{colors.yellow}` is the CTA + the one colored (close) shadow;
+`{colors.black}` ground is the close surface. **No sixth pastel.**
+
+## Typography
+
+Two ramps. The **reading/chrome ramp** (Inter body 0.95cqw weight 500, Space Grotesk labels in px)
+carries copy + chrome; the **display ramp** (Inter `heading-md` 2.1cqw → `heading-xl` 5cqw, weight
+800–900 uppercase) carries every headline + stat.
+
+- **Legibility floor:** any load-bearing line ≥ **1.4cqw**; px labels are chrome only.
+- **Fit-to-measure:** size the headline to its length. Cap the block at **≤ 78cqw**; ≤3 words → `heading-xl`; 4–6 → `heading-lg`; 7+ → `heading-md`.
+- **Inter display is uppercase, weight 800–900, negative-tracked** (−0.01..−0.03em); body weight 500 sentence case; **Space Grotesk labels uppercase 0.08em**. No sentence-case display, no untracked display.
+
+## Depth & Surface
+
+Hard offset shadow, solid black, zero blur, bottom-right:
+
+- **0.8cqw (8px)** primary cards; **0.4cqw (4px)** chrome; **0.6cqw (6px)** hover.
+- **Border-based depth** — the 4px/3px borders do much of the lift; shadow makes it "elevated."
+- **Tilt** — ±2°–12° rotation breaks the grid for perceived dimension.
+- **Inverted close** — 12px YELLOW shadow (and 6px white on close-btn) — the only colored shadows.
+
+**Ceiling:** no blurred shadow, no rounded corner (save the stat-deco dot), no gradient depth.
+
+## Shapes
+
+- **0 radius everywhere** except the 12px stat-deco dot (50%). Square corners are the structural identity.
+
+## Components
+
+- **card-elevated / card-small** — the bordered+shadowed content cards (weight-coupled).
+- **label-pill** — the universal eyebrow (border+shadow+pastel). **button-primary** — yellow CTA.
+- **star-burst / stripe-block / bg-dot-grid / tilt-deco** — the reusable decoration units (one per frame min).
+- **stat-deco-dot** — the lone round shape. **close-frame** — the inverted black+white+yellow-shadow closer.
+
+## Frame Treatments
+
+> Recipe: ground · container · composes · focal · chrome · accent · silence · Fixed/Free · density.
+> Cycle the ground color; add ≥1 decoration per frame; open with a label-pill.
+
+### 1 · Cover (identity · move: decorations puncture · left)
+
+**Ground** `{colors.cream}` (or offwhite) + faint dot-grid. **Composes** label-pill, heading-xl, tilt-deco rect, star-burst, counter. **Focal** a 2–3 line Inter `heading-xl` uppercase, left, under a label-pill; tilted pastel rects + a star burst puncture the right. **Chrome** counter pill. **Accent** the decorations' pastels. **Silence** right third holds decorations. **Fixed** 4px/8px coupling, uppercase display, square. **Free** title, decoration placement/colors. **Density** comfortable.
+
+### 2 · Feature Cards (catalog · move: 3-up bordered grid · blue ground)
+
+**Ground** `{colors.blue}`, `slide-pad`. **Composes** label-pill, heading-lg, 3× card-elevated (icon-square + card-title + body). **Focal** three white bordered+shadowed cards. **Chrome** label-pill eyebrow. **Accent** the pastel icon-squares (pink/green/yellow). **Silence** tight — dense by design. **Fixed** 4px border + 8px shadow, square, uppercase card-titles. **Free** card content, icon hues. **Density** dense-exception.
+
+### 3 · Stat Grid (data · move: tilted stat cards · green ground)
+
+**Ground** `{colors.green}`, `slide-pad`. **Composes** label-pill, heading-lg, 3× card-small (tilted −2/+2°, stat-deco dot, stat-number + label). **Focal** three tilted bordered stat cards. **Accent** the deco-dots' pastels + black stat numerals. **Silence** moderate. **Fixed** alternating tilt, 3px+4px, round deco-dot only. **Free** figures (from script), dot hues. **Density** dense-exception.
+
+### 4 · Closing Plate (closer · move: inverted black · centered)
+
+**Ground** `{colors.black}`. **Composes** close-frame (4px white border, 12px yellow shadow), label-pill (inverted), close-title, star-burst. **Focal** a white `close-title` inside the white-bordered frame with the yellow offset shadow; a pink star punctures a corner. **Accent** the yellow shadow + pink star. **Silence** ~50%. **Fixed** white-on-black, 12px yellow shadow (only here), square. **Free** sign-off, star placement. **Density** low.
+
+### 5 · Quote (quote · move: bordered quote frame · pink ground)
+
+**Ground** `{colors.pink}` (or offwhite). **Composes** label-pill, quote-text in a card-elevated, attribution. **Focal** an Inter `quote-text` (900 uppercase) inside a white bordered+shadowed frame. **Accent** the ground + one decoration. **Silence** moderate. **Fixed** uppercase quote, 4px/8px. **Free** quote, ground. **Density** comfortable.
+
+### 6 · Timeline (process · move: stepped bordered cards · offwhite)
+
+**Ground** `{colors.offwhite}`. **Composes** label-pill, heading-lg, 3–4 card-small steps + step-connectors. **Focal** a row of bordered step cards linked by black connector bars, each a pastel + step-num. **Accent** the step pastels. **Silence** moderate. **Fixed** 3px+4px steps, square, connectors. **Free** steps, hues. **Density** standard.
+
+## Composition Rules
+
+### Do
+
+- Pair **4px borders with 8px shadows**, **3px with 4px** — the coupling is non-negotiable.
+- **Cycle pastel grounds** across frames; keep the deck visually rhythmic.
+- Set Inter display **uppercase, 800–900, negative-tracked**; open every region with a **label-pill**.
+- Render shadows **solid black, zero blur, bottom-right**; add **≥1 decoration** (tilt/star/stripe/dots) per frame.
+- Use **yellow** for CTAs; use the **inverted black + 12px yellow shadow** close-frame for the closer.
+- Tilt decorations ±2°–12°; lean left on most frames.
+
+### Don't
+
+- No rounded corners (save the stat-deco dot); no blurred shadows.
+- No colored borders (black only, save the close-frame white); no sixth pastel.
+- No sentence-case Inter display; no untracked display; no label as plain text.
+- Don't keep everything perfectly aligned (tilt is the signature); don't leave corners empty.
+- Don't blow a headline edge-to-edge — fit to measure.
+
+## Aspect-Ratio Behavior
+
+| Treatment     | 16:9                          | 9:16                         | 1:1                      |
+| ------------- | ----------------------------- | ---------------------------- | ------------------------ |
+| Cover         | title left, decorations right | title top, decorations below | title, fewer decorations |
+| Feature Cards | 3 across                      | 3 stacked                    | 2+1                      |
+| Stat Grid     | 3 tilted across               | 3 tilted stacked             | 2×2                      |
+| Closing       | centered close-frame          | centered, taller             | centered                 |
+| Quote         | quote frame                   | quote stacked                | centered                 |
+| Timeline      | horizontal steps              | vertical (connectors hidden) | 2×2                      |
+
+`slide-pad` holds on the short edge; re-step display above the 1.4cqw floor. Decoration count drops
+on tighter ratios so the frame stays bordered, not cluttered.
+
+## Approved Entities
+
+No real customers, logos, or vendors are defined in the source — render any such mark as a
+placeholder. Pastel fills, decorations, and tilts are content-agnostic.
+
+## Numerals & Claims (hard rule)
+
+Never invent figures, stats, or counts at frame scale. Render slots as `— figure —`, `{metric}`,
+`N×`. Stat cards and charts carry placeholders until the script supplies values. Slide counters and
+list numbers are decorative.
+
+## Pre-Render Self-Audit
+
+- **Squint** — one Inter display moment dominates; cards read as a system.
+- **Silence** — only feature/stat grids run dense; cover/quote/close keep air with decorations.
+- **Borders/shadows** — 4px↔8px / 3px↔4px coupling holds; solid black, zero blur.
+- **Color** — pastel ground cycles; black borders only (white on close); no sixth pastel.
+- **Type** — Inter uppercase 800–900 negative-tracked, fit-to-measure; Space Grotesk labels 0.08em; ≥1.4cqw floor.
+- **Shape** — square corners (only stat-deco dot round); ≥1 tilt/decoration per frame.
+- **Fabrication** — every numeral traces to the script, else placeholder.
+
+## Known Gaps
+
+- **Motion intentionally out of scope.** frame.md specifies composition only; the source toggles slides via display, no transition.
+- **Inter + Space Grotesk via Google Fonts.** CJK: Noto Sans SC 900 (sentence case — the uppercase signal drops); lean harder on borders/shadows/decoration to carry the brutalist identity.
+- **9:16 / 1:1 are guidance**; verify the floor and that decoration count scales down.
+- Star bursts (clip-path), stripe blocks, dot grids, and tilts are CSS-only; no external imagery is required.

skills/hyperframes-creative/frame-presets/blockframe/caption-skin.html

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+<!--
+  BlockFrame — caption skin (preset-local source).
+
+  This is the preset's own lower-third karaoke caption look. product-launch-video's
+  Step 2 copies it into the project as caption-skin.html; captions.mjs then fills the
+  three reserved holes, wraps the fragment in a <template>, and writes
+  compositions/captions.html:
+    · the empty GROUPS array            → the engine's scene-aware word groups
+    · the 0 duration + 0 width/height   → real total + canvas size
+    · the empty data-brand-tokens style → :root tokens derived from the project's frame.md
+
+  Token contract — reference ONLY this fixed vocab (captions.mjs injects it from
+  frame.md, so the Step-2 brand overlay flows through; each var has a blockframe literal
+  fallback for standalone preview):
+    --cap-ink · --cap-canvas · --cap-accent · --cap-accent-2 · --font-display ·
+    --font-body · --cap-band-top · --cap-band-height
+  Hooks (do not rename): .caption-group / .caption-word + states .is-active / .is-spoken,
+  root data-composition-id="captions", timeline at window.__timelines["captions"].
+  State changes use gsap.set({className}) (applied on the engine's frame-by-frame seek);
+  never tl.call() callbacks (seek does not fire them → wrong state on render).
+
+  Visual: a white card carved by a 4px black border with an 8px hard offset shadow
+  (solid black, zero blur, bottom-right — blockframe's sacred depth), square corners.
+  Inter 900, UPPERCASE, negative-tracked. Upcoming words sit in faded ink; the current
+  word gets a saturated-yellow stamp-block — a hard square highlight (box-shadow spread,
+  no blur) with black ink reading on top, blockframe's signature stamp gesture; spoken
+  words settle to solid black ink, stamp cleared. The word pops in with a snappy
+  back.out overshoot — loud, a little crooked.
+-->
+<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
+
+<!-- captions.mjs injects the project's :root tokens here -->
+<style data-brand-tokens></style>
+
+<style>
+  #captions-root {
+    position: absolute;
+    inset: 0;
+    pointer-events: none;
+  }
+  .caption-layer {
+    position: absolute;
+    inset: 0;
+    z-index: 20;
+    pointer-events: none;
+  }
+  /* the keep-out band, from captionBand(H) — frame content stays above it */
+  .caption-stage {
+    position: absolute;
+    left: 0;
+    right: 0;
+    top: var(--cap-band-top, 900px);
+    height: var(--cap-band-height, 180px);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+  }
+  .caption-group {
+    /* every group is absolutely stacked over the SAME band — exactly one shown at a
+       time via opacity. Must be absolute: in-flow groups would lay out side-by-side. */
+    position: absolute;
+    inset: 0;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    opacity: 0;
+  }
+
+  /* THE bordered card — 4px black border + 8px hard offset shadow (solid black,
+     zero blur, bottom-right — blockframe's sacred depth), square corners */
+  .caption-pill {
+    max-width: 80%;
+    padding: 18px 40px 22px;
+    background: var(--cap-canvas, #ffffff);
+    border: 4px solid var(--cap-ink, #000000);
+    border-radius: 0;
+    box-shadow: 8px 8px 0 var(--cap-ink, #000000);
+  }
+  .caption-line {
+    display: flex;
+    flex-wrap: wrap;
+    justify-content: center;
+    gap: 0.12em 0.32em;
+    font-family: var(--font-display, "Inter"), system-ui, sans-serif;
+    font-weight: 900;
+    text-transform: uppercase;
+    font-size: clamp(38px, 4.2vw, 56px);
+    line-height: 1.12;
+    letter-spacing: -0.02em;
+  }
+
+  /* upcoming — faded black ink, no stamp */
+  .caption-word {
+    display: inline-block;
+    padding: 0 0.1em;
+    color: color-mix(in srgb, var(--cap-ink, #000000) 40%, var(--cap-canvas, #ffffff));
+  }
+  /* current word — THE yellow stamp-block (box-shadow spread = a hard square block
+     w/o layout shift; no blur), black ink reading on top — blockframe's signature stamp */
+  .caption-word.is-active {
+    color: var(--cap-ink, #000000);
+    background: var(--cap-accent, #f7cb46);
+    box-shadow: 0 0 0 0.08em var(--cap-accent, #f7cb46);
+  }
+  /* already spoken — solid black ink, stamp cleared */
+  .caption-word.is-spoken {
+    color: var(--cap-ink, #000000);
+    background: transparent;
+    box-shadow: none;
+  }
+
+  /* optional per-word accents (dormant until a word-classer tags them) */
+  /* brand / key term — heavier ink weight, blockframe's display is already 900 */
+  .caption-word.cap-brand {
+    color: var(--cap-ink, #000000);
+  }
+  /* numerals / data — the body voice, slightly recessed */
+  .caption-word.cap-num {
+    font-family: var(--font-body, "Inter"), ui-monospace, monospace;
+    color: color-mix(in srgb, var(--cap-ink, #000000) 74%, var(--cap-canvas, #ffffff));
+  }
+  /* emphasis — a cream hard underline bar (the second-chroma accent) */
+  .caption-word.cap-cta {
+    text-decoration: underline;
+    text-decoration-thickness: 4px;
+    text-decoration-color: var(--cap-accent-2, #ffdc8b);
+    text-underline-offset: 0.12em;
+  }
+
+  @media (max-aspect-ratio: 9/16) {
+    .caption-pill {
+      max-width: 92%;
+    }
+    .caption-line {
+      font-size: clamp(34px, 5.4vw, 48px);
+    }
+  }
+</style>
+
+<div
+  id="captions-root"
+  data-composition-id="captions"
+  data-timeline-locked
+  data-start="0"
+  data-duration="0"
+  data-fps="30"
+  data-width="0"
+  data-height="0"
+>
+  <div class="caption-layer" aria-hidden="true">
+    <div id="caption-stage" class="caption-stage"></div>
+  </div>
+</div>
+
+<script>
+  // captions.mjs injects the engine's scene-aware groups + real duration here.
+  var GROUPS = [];
+  var DURATION = 0;
+
+  (function () {
+    var stage = document.getElementById("caption-stage");
+
+    // build DOM: one .caption-group per group, .caption-word per word
+    GROUPS.forEach(function (group, g) {
+      var groupEl = document.createElement("div");
+      groupEl.className = "caption-group";
+      groupEl.id = "caption-group-" + g;
+      var pill = document.createElement("div");
+      pill.className = "caption-pill";
+      var line = document.createElement("div");
+      line.className = "caption-line";
+      (group.words || []).forEach(function (w, i) {
+        var span = document.createElement("span");
+        span.className = "caption-word";
+        span.id = "caption-word-" + g + "-" + i;
+        span.textContent = String(w.text);
+        line.appendChild(span);
+      });
+      pill.appendChild(line);
+      groupEl.appendChild(pill);
+      stage.appendChild(groupEl);
+    });
+
+    window.__timelines = window.__timelines || {};
+    var tl = gsap.timeline({ paused: true });
+
+    GROUPS.forEach(function (group, g) {
+      var groupEl = document.getElementById("caption-group-" + g);
+      var words = group.words || [];
+      var next = GROUPS[g + 1];
+      var isLast = g === GROUPS.length - 1;
+      var start = Math.max(0, Number(group.start));
+      var end = isLast ? DURATION : Math.min(Number(next.start), Number(group.end) + 0.3);
+      if (end <= start) end = start + 0.01;
+
+      // group on/off — exactly one group visible at a time
+      tl.set(groupEl, { opacity: 1 }, start);
+      tl.set(groupEl, { opacity: 0 }, end);
+
+      // 3-state karaoke via className SETS — seek-safe (gsap.set applies on the
+      // engine's frame-by-frame seek; .call callbacks would NOT fire).
+      words.forEach(function (w, i) {
+        var el = document.getElementById("caption-word-" + g + "-" + i);
+        var at = Math.max(start, Number(w.start));
+        tl.set(el, { className: "caption-word" }, start); // upcoming (also resets on reverse-seek)
+        tl.set(el, { className: "caption-word is-active" }, at); // current
+        tl.fromTo(el, { scale: 0.86 }, { scale: 1, duration: 0.2, ease: "back.out(2.4)" }, at);
+        if (i + 1 < words.length) {
+          var nextAt = Math.max(start, Number(words[i + 1].start));
+          tl.set(el, { className: "caption-word is-spoken" }, nextAt); // demote when next activates
+        }
+      });
+      if (words.length) {
+        var lastEl = document.getElementById("caption-word-" + g + "-" + (words.length - 1));
+        var lastSpoken = Math.min(end, Number(words[words.length - 1].end) + 0.1);
+        tl.set(lastEl, { className: "caption-word is-spoken" }, lastSpoken);
+      }
+    });
+
+    // full-span anchor so the sub-comp timeline spans the whole video
+    tl.to({}, { duration: DURATION }, 0);
+    window.__timelines["captions"] = tl;
+  })();
+</script>