chore: import upstream snapshot with attribution

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

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+---
+version: alpha
+name: Cartesian — Frame (video / frame layer)
+description: >
+  Video-first companion to Cartesian's design.md. The unit is the frame (1920×1080). Atoms are
+  identical and sacred — the five-tone warm-stone palette, Playfair Display 400 + Inter, the
+  universal 1px taupe hairline as the only structural device, compass-drafted geometric rings,
+  and zero shadow / zero fill. Composition, frame scale, and aspect-ratio behavior are rewritten
+  for the frame. Restraint is the rule; motion is 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:
+  bg-primary: "#EDE8E0"
+  bg-secondary: "#E2DBD1"
+  text-primary: "#1A1A1A"
+  text-secondary: "#5A5A5A"
+  accent: "#8A8178"
+  line: "#B8B0A4"
+  white-overlay: "rgba(255,255,255,0.3)"
+
+typography:
+  # — reading ramp (Inter) —
+  body:        { fontFamily: "Inter", cqw: 1.0,  weight: 400, lineHeight: 1.6, color: "text-secondary" }
+  body-sm:     { fontFamily: "Inter", cqw: 0.85, weight: 400, lineHeight: 1.6 }
+  subtitle:    { fontFamily: "Inter", cqw: 1.3,  weight: 400, lineHeight: 1.5 }
+  label:       { fontFamily: "Inter", px: 14, weight: 500, tracking: "3px", upper: true, color: "accent" }
+  attribution: { fontFamily: "Inter", px: 15, weight: 400, tracking: "2px", upper: true, color: "accent" }
+  micro:       { fontFamily: "Inter", px: 12, weight: 400, tracking: "2px", upper: true, color: "accent" }
+  # — display / hero ramp (Playfair Display 400, sentence case) —
+  h3:          { fontFamily: "Playfair Display", cqw: 1.8, weight: 400, lineHeight: 1.1 }
+  timeline-headline:{ fontFamily: "Playfair Display", cqw: 1.9, weight: 400, lineHeight: 1.1 }
+  card-headline:{ fontFamily: "Playfair Display", cqw: 2.0, weight: 400, lineHeight: 1.15 }
+  stat-figure: { fontFamily: "Playfair Display", cqw: 3.0, weight: 400, lineHeight: 1.0 }
+  quote-mark:  { fontFamily: "Playfair Display", cqw: 9.0, weight: 400, lineHeight: 0.5, color: "line" }
+  h2:          { fontFamily: "Playfair Display", cqw: 4.0, weight: 400, lineHeight: 1.1 }
+  h1:          { fontFamily: "Playfair Display", cqw: 6.2, weight: 400, lineHeight: 1.06 }
+  display:     { fontFamily: "Playfair Display", cqw: 8.0, weight: 400, lineHeight: 1.04 }
+
+spacing:
+  pad-x: "7cqw"
+  pad-y: "5cqw"
+  gap-xl: "6cqw"
+  gap-lg: "5cqw"
+
+components:
+  hairline:
+    rule: "0.07cqw solid {colors.line}"
+    description: "The universal structural device — every separator (agenda rule, timeline connector, card border, stats top) is this 1px taupe line. No thick borders exist."
+  card:
+    backgroundColor: "{colors.white-overlay}"
+    border: "0.07cqw solid {colors.line}"
+    rounded: "0"
+    shadow: "none"
+    description: "Faint white-overlay fill (canvas bleeds through) is what makes a card distinct from a bare region."
+  card-icon:
+    border: "0.07cqw solid {colors.line}"
+    rounded: "50%"
+    size: "40px circle"
+    textColor: "{colors.accent}"
+    typography: "Playfair numeral/letter"
+    description: "Ringed circle mark."
+  agenda-row:
+    borderBottom: "0.07cqw solid {colors.line}"
+    typography: "{typography.h3} (numeral {colors.accent}, label {colors.text-primary})"
+    description: "Numeral left, label right over a taupe rule."
+  timeline:
+    borderTop: "0.07cqw solid {colors.line}"
+    typography: "{typography.timeline-headline} + {typography.body-sm}"
+    description: "A single taupe top rule across items — no nodes, no dots."
+  stats-cluster:
+    borderTop: "0.07cqw solid {colors.line}"
+    typography: "{typography.stat-figure} + uppercase {colors.accent} labels"
+    description: "Inline modest stat figures (no hero numeral)."
+  geo-ring:
+    border: "1px solid {colors.line} (inner dashed ::before ~70–80%)"
+    rounded: "50%"
+    size: "10–50cqw"
+    opacity: "0.2–0.5"
+    description: "Compass-construction rings behind content. 1–2 per frame, never more."
+  horizontal-accent:
+    backgroundColor: "{colors.text-primary}"
+    size: "~18cqw × 1px"
+    description: "The system's only INK-BLACK rule — a strong terminal accent on cover/closing, sparingly."
+  vertical-line:
+    backgroundColor: "{colors.line}"
+    size: "1px × full height, ~5cqw from edge"
+    opacity: "0.3–0.4"
+    description: "Drafting-paper alignment guide. Optional."
+  image-placeholder:
+    backgroundColor: "{colors.bg-secondary}"
+    mark: "crossed +30°/−30° 1px taupe diagonals (an X)"
+    typography: "small uppercase {typography.micro}"
+    description: "The signature image-not-wired mark."
+  team-photo:
+    backgroundColor: "{colors.bg-secondary}"
+    border: "0.07cqw solid {colors.line}"
+    rounded: "50%"
+    typography: "Playfair initial in {colors.accent}"
+    description: "Circular portrait frame."
+---
+
+# Cartesian — Frame (video / frame layer)
+
+## Overview
+
+Cartesian at frame scale is a **quiet museum-catalog editorial system** — restraint through 1px
+lines. Every structural separator is a single 1px taupe hairline; there are no thick borders, no
+fills (save the faint white-overlay card), no shadows, no rounded rectangles. Hierarchy comes from
+**type contrast and negative space**, and atmosphere from **compass-drafted geometric rings**
+drifting behind content.
+
+The voice is a literary pairing: **Playfair Display** at weight 400 (the thin-stroke didone, never
+bold, always sentence case) carries every headline, numeral, and quote mark in ink; **Inter**
+carries body in warm gray and labels in uppercase taupe with 2–3px tracking. The palette is five
+warm stones plus ink — no populist accent color exists. The correct density is **sparse and
+breathing**: one clear idea, well-framed, on stone paper.
+
+**Key characteristics at frame scale:**
+
+- **1px taupe hairline** as the universal structural device — every separator is this one line.
+- **Playfair Display 400** (ink, sentence case) for display; **Inter** body (gray) + labels (taupe, tracked).
+- **Five warm stones + ink** — no red/blue/green; the only "color" is type contrast.
+- **Compass-drafted geometric rings** (solid + dashed, 20–50% opacity) behind content for mood.
+- **Flat** — zero shadow, zero rounded rectangle (circles only); the lone ink line is the `horizontal-accent`.
+- **Sparse and breathing** — generous negative space; crowding reads as broken.
+
+## The Frame
+
+### Frame Craft Bar
+
+Three eyeball tests gate every frame before any structural check:
+
+- **Squint** — one Playfair element dominates at **3–6× its nearest neighbor**; the serif/sans + size contrast carries hierarchy, not weight.
+- **Silence** — declarative frames read **55–60% empty**; Cartesian has **no dense frame** — even the agenda/index breathes (the system breaks when crowded).
+- **Restraint** — **at most two geo rings** per frame; the single INK-BLACK `horizontal-accent` rule used sparingly; no populist accent color ever.
+- **Reference** — aim at a **Vignelli editorial / Cooper Hewitt catalogue / pencil-and-tracing-paper plan**; failure looks like a **shadowed, rounded-card SaaS deck**.
+
+- **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:** `pad-x` (7cqw) generous gutters; geometry may bleed off an edge.
+
+**The container law (load-bearing).** Every frame ground sets `container-type: size`; ALL
+frame-relative units are `cqw`/`cqh` against it — never `vw`. The 1px hairlines and geo rings hold
+their proportion against the frame at any render size.
+
+## Colors
+
+Tokens identical to the source. `{colors.bg-primary}` is the ground; `{colors.text-primary}` ink is
+headlines and the one black accent rule; `{colors.text-secondary}` gray is body; `{colors.accent}`
+taupe is labels, numerals, small text; `{colors.line}` taupe is every 1px structural border.
+`{colors.bg-secondary}` is the only secondary fill (placeholders, photo frames). **No populist
+accent** — when emphasis is needed, grow the type, switch sans→serif, or add a single
+`horizontal-accent` ink line. Headlines are never taupe; small text is never ink.
+
+## Typography
+
+Two ramps. The **reading ramp** (Inter body 1.0cqw gray, labels in px taupe) carries copy + chrome;
+the **display ramp** (Playfair `h3` 1.8cqw → `display` 8.0cqw, all weight 400) carries every headline.
+
+- **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 → `display`/`h1`; 4–6 → `h2`; 7+ → `h3`. Cartesian has no hero-stat numeral — stats stay modest (`stat-figure` 3cqw).
+- **Playfair at 400, ink, sentence case** — never bold, never uppercase, never taupe. **Inter labels uppercase, 2–3px tracked, taupe.** Italic via Playfair italic for emphasis only.
+
+## Depth & Surface
+
+The flat plane is the only technique. Hierarchy from:
+
+- **Type contrast** — Playfair serif vs Inter sans; the 8cqw→0.7cqw scale.
+- **1px taupe hairlines** — every divider, card outline, timeline rule, photo ring.
+- **Tone** — ink vs gray vs taupe.
+- **Negative space** — generous padding.
+- **Geometric atmosphere** — compass rings that suggest depth without creating it.
+
+**Ceiling:** no box-shadow, no elevated card, no gradient, no rounded rectangle. The single ink line
+(`horizontal-accent`) is the only non-taupe rule.
+
+## Shapes
+
+- **50% (circle)** — card-icon, team-photo, nav-dot, every geo ring.
+- **0** — everything else; soft-rounded corners do not exist.
+
+## Components
+
+- **hairline** — the universal 1px taupe separator (the identity).
+- **card** (1px taupe + white-overlay) / **card-icon** (ringed circle) / **agenda-row** / **timeline** (line, no nodes) / **stats-cluster** — all built on the hairline.
+- **geo-ring** — compass decoration (solid + dashed), 1–2 per frame. **horizontal-accent** — the one ink line, sparingly. **vertical-line** — drafting guide.
+- **image-placeholder** (crossed-X) / **team-photo** (ringed initial) — the stone-fill placeholders.
+
+## Frame Treatments
+
+> Recipe: ground · container · composes · focal · chrome · accent · silence · Fixed/Free · density.
+> Every frame is sparse and breathing; 1–2 geo decorations max.
+
+### 1 · Cover (identity · move: serif + compass ring · left)
+
+**Ground** `{colors.bg-primary}`, `pad-x`. **Composes** geo-ring (right, ~34cqw, solid+dashed), vertical-line (left), label, display/h1. **Focal** a 2–3 line Playfair `display`/`h1` headline in ink (italic on the key word), left-anchored, with a taupe `label` above and an Inter subtitle below. **Chrome** optional bottom meta row (Playfair value + taupe label). **Accent** the geo ring; optionally one `horizontal-accent` ink line (if it clears the meta). **Silence** ~55% empty. **Fixed** Playfair 400 ink sentence-case, ≤2 geo elements, 1px lines. **Free** title, ring placement, meta. **Density** sparse.
+
+### 2 · Agenda / Index (index · move: hairline list · left)
+
+**Ground** `{colors.bg-primary}`, `pad-x`. **Composes** label, h2, agenda-rows. **Focal** a Playfair `h2` over 4–6 agenda rows (Playfair numeral in taupe + Playfair label in ink), each on a 1px taupe rule. **Chrome** taupe `label` eyebrow. **Accent** none — taupe numerals carry it. **Silence** moderate; rows generously spaced. **Fixed** 1px taupe rules, Playfair 400. **Free** items, count. **Density** standard (sparse rows).
+
+### 3 · Pull Quote (quote · move: centered statement · compass ring)
+
+**Ground** `{colors.bg-primary}`, centered. **Composes** geo-ring (centered dashed, ~26cqw), quote-mark, h2/display-quote, attribution. **Focal** a 2-line Playfair quote in ink, centered, under a 50%-taupe Playfair quote-mark; a taupe uppercase attribution beneath. **Accent** the faint centered ring. **Silence** ~60% — deliberately open. **Fixed** Playfair 400, one ring, centered. **Free** quote, attribution. **Density** sparse.
+
+### 4 · Closing Plate (closer · move: centered ring · centered)
+
+**Ground** `{colors.bg-primary}`, centered. **Composes** geo-ring (centered, ~40cqw, solid+dashed), label, h1/display, horizontal-accent. **Focal** a 1–2 line Playfair sign-off in ink (italic key word), centered inside the largest compass ring; a short ink `horizontal-accent` beneath. **Accent** the ring + the one ink line. **Silence** ~60%. **Fixed** Playfair 400, centered, ≤2 geo. **Free** sign-off, ring scale. **Density** sparse.
+
+### 5 · Two-Column Editorial (content · move: asymmetric split · left)
+
+**Ground** `{colors.bg-primary}`, `pad-x`, two columns with `gap-xl`. **Composes** label, h2, body, image-placeholder (crossed-X) or card. **Focal** a Playfair `h2` + Inter body in the text column; an image-placeholder or card in the other. **Accent** none. **Silence** generous gutter. **Fixed** 1px taupe card/placeholder borders, white-overlay fill. **Free** which side is text, body copy. **Density** standard.
+
+### 6 · Stats / Timeline (data · move: hairline rail · left)
+
+**Ground** `{colors.bg-primary}`, `pad-x`. **Composes** label, h3, stats-cluster or timeline. **Focal** a modest Playfair stat row (or a 1px-rule timeline with year + headline + body, no nodes), framed by a 1px taupe top rule. **Accent** none. **Silence** moderate. **Fixed** modest stat scale, hairline rule, no nodes. **Free** figures, phases. **Density** standard.
+
+## Composition Rules
+
+### Do
+
+- Use a **single 1px taupe line** for every separator — the hairline is the identity.
+- Set every **Playfair headline at 400, ink, sentence case**; render labels taupe, uppercase, 2–3px tracked.
+- Layer **one or two compass rings** (solid + dashed, 20–50% opacity) behind content for atmosphere.
+- Let frames **breathe** — sparse, generous negative space; 55–60% empty on declarative frames.
+- Lean centered on quote/closer; asymmetric/left on cover/agenda/editorial. Use `bg-secondary` for placeholder fills.
+
+### Don't
+
+- Don't introduce a populist accent color — stone and ink only.
+- Don't bold Playfair, render headlines in taupe, or use thick (2px+) borders.
+- Don't add shadows, elevated cards, or rounded rectangles (circles only).
+- Don't crowd the frame — packed layouts read as broken.
+- Never more than two geo decorations per frame; don't blow a headline edge-to-edge.
+
+## Aspect-Ratio Behavior
+
+| Treatment            | 16:9                       | 9:16                                | 1:1                         |
+| -------------------- | -------------------------- | ----------------------------------- | --------------------------- |
+| Cover                | headline left, ring right  | headline top, ring below            | headline upper, ring behind |
+| Agenda / Index       | h2 + rows                  | h2 + rows (tighter)                 | h2 + rows                   |
+| Pull Quote           | centered, ring behind      | centered, taller                    | centered                    |
+| Closing Plate        | centered in ring           | centered, ring scaled               | centered                    |
+| Two-Column Editorial | text + visual side-by-side | stacked (collapse)                  | stacked                     |
+| Stats / Timeline     | horizontal rail            | vertical stack (drop timeline rule) | compact                     |
+
+Generous `pad-x` holds on the short edge; re-step display per ratio above the 1.4cqw floor. On
+9:16, the timeline rule loses meaning when stacked — switch to a vertical list (per source).
+
+## Approved Entities
+
+No real customers, logos, or vendors are defined in the source — render any such mark as a
+placeholder (the crossed-X image-placeholder, or a ringed initial for portraits).
+
+## Numerals & Claims (hard rule)
+
+Never invent figures, dates, or counts at frame scale. Render slots as `— figure —`, `{metric}`.
+Stats and timeline years carry placeholders until the script supplies them. Agenda ordinals
+(01, 02…) are decorative and may be sequential.
+
+## Pre-Render Self-Audit
+
+- **Squint** — one Playfair element dominates; the serif/sans contrast carries hierarchy.
+- **Silence** — declarative frames 55–60% empty; nothing is crowded.
+- **Palette** — five stones + ink only; no populist accent; headlines ink, labels taupe.
+- **Lines** — every separator is a 1px taupe hairline; the only ink line is `horizontal-accent`.
+- **Type** — Playfair 400 sentence-case, fit-to-measure; labels uppercase 2–3px; ≥1.4cqw floor.
+- **Depth** — 0 shadow, 0 rounded rectangle; ≤2 geo rings per frame.
+- **Anchor** — centered on quote/closer, left/asymmetric on cover/agenda/editorial; no 3 in a row alike.
+- **Fabrication** — every numeral traces to the script, else placeholder.
+
+## Known Gaps
+
+- **Motion intentionally out of scope.** frame.md specifies composition only; the 0.6s fade in the source is a deck mechanic.
+- **Playfair Display + Inter via Google Fonts.** CJK pairing (Noto Serif SC 700/400) carries over; Playfair has no Hanzi italic — substitute weight/taupe for emphasis.
+- **9:16 / 1:1 are guidance**; verify the legibility floor and that the timeline collapses to a vertical list.
+- Geo rings, the crossed-X placeholder, and the dashed inner ring are CSS-only; no external imagery is required.

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

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+<!--
+  Cartesian — 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 cartesian 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 museum-catalog lower-third — a warm-stone card on a single 1px taupe
+  hairline border (cartesian's universal structural device), SHARP corners, ZERO
+  shadow, ZERO fill beyond the stone canvas. Playfair Display 400, sentence case, ink
+  glyphs. Upcoming words sit in faint ink; the current word is marked QUIETLY — a faint
+  stone wash with a 1px taupe hairline underline (restraint, not a loud block); spoken
+  words settle to solid ink, the wash and underline cleared.
+-->
+<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 stone card — single 1px taupe hairline border (cartesian's universal
+     structural device), SHARP corners, ZERO shadow, ZERO fill beyond the stone canvas */
+  .caption-pill {
+    max-width: 78%;
+    padding: 20px 44px 24px;
+    background: var(--cap-canvas, #ede8e0);
+    border: 1px solid var(--cap-accent-2, #b8b0a4);
+    border-radius: 0;
+  }
+  .caption-line {
+    display: flex;
+    flex-wrap: wrap;
+    justify-content: center;
+    gap: 0.1em 0.34em;
+    font-family: var(--font-display, "Playfair Display"), Georgia, serif;
+    font-weight: 400;
+    font-size: clamp(40px, 4.4vw, 58px);
+    line-height: 1.16;
+    letter-spacing: -0.01em;
+  }
+
+  /* upcoming — faint ink, no mark */
+  .caption-word {
+    display: inline-block;
+    padding: 0 0.06em;
+    border-bottom: 1px solid transparent;
+    color: color-mix(in srgb, var(--cap-ink, #1a1a1a) 42%, var(--cap-canvas, #ede8e0));
+  }
+  /* current word — a QUIET marker: a faint warm-stone wash behind solid ink, plus a
+     1px taupe hairline underline (restraint, not a loud block; SHARP, NO shadow) */
+  .caption-word.is-active {
+    color: var(--cap-ink, #1a1a1a);
+    background: color-mix(in srgb, var(--cap-accent, #8a8178) 18%, var(--cap-canvas, #ede8e0));
+    border-bottom: 1px solid var(--cap-accent, #8a8178);
+  }
+  /* already spoken — solid ink, wash + underline cleared */
+  .caption-word.is-spoken {
+    color: var(--cap-ink, #1a1a1a);
+    background: transparent;
+    border-bottom: 1px solid transparent;
+  }
+
+  /* optional per-word accents (dormant until a word-classer tags them) */
+  /* brand / key term — Playfair Display italic, cartesian's only display inflection */
+  .caption-word.cap-brand {
+    font-style: italic;
+  }
+  /* numerals / data — the body sans voice, slightly recessed */
+  .caption-word.cap-num {
+    font-family: var(--font-body, "Inter"), ui-sans-serif, sans-serif;
+    color: color-mix(in srgb, var(--cap-ink, #1a1a1a) 72%, var(--cap-canvas, #ede8e0));
+  }
+  /* emphasis — a 1px taupe hairline underline (no second color; stone-and-ink only) */
+  .caption-word.cap-cta {
+    text-decoration: underline;
+    text-decoration-thickness: 1px;
+    text-decoration-color: var(--cap-accent, #8a8178);
+    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: 0.985 }, { scale: 1, duration: 0.2, ease: "power1.out" }, 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>