// ─────────────────────────────────────────────────────────────
// protected/bifrost.js — Project Bifrost scenes inside the
// Overview page of the timeline.
//
// This file:
// 1. Wraps site-2's six scroll-bound scenes (hero → architecture
// stack → words → aurora arc → treasure-map → join CTA) so
// they run inside the Overview page, not as a standalone site.
// 2. Rewires Lenis smooth scroll + GSAP ScrollTrigger so the
// scroller is the Overview's internal scrolling container —
// never the window — so the three-page Timeline/Overview/
// Timeline model (each fixed-viewport) keeps working.
// 3. Drives the Europe map's opacity from the scroller's scroll
// position: fully visible at the top, fades to 0 as the user
// scrolls into the hero, fades back in on scrolling up.
// 4. Is a lazy-init module. Nothing happens at page load; the
// dot-nav handler in timeline.js calls window.__bifrost.init()
// the first time the Overview page becomes active.
//
// CSP: 'script-src self'. No inline scripts anywhere.
// ─────────────────────────────────────────────────────────────
(function () {
'use strict';
// Lazy single-shot init flag — nav can click the Overview pip
// multiple times; we only wire everything up once.
let initialized = false;
let refreshScheduled = false;
// Shared state between init() and the public surface (scrollTo etc).
// These are assigned once during init(); scrollTo reads them to drive
// the Overview's internal scroller instead of window scroll.
let lenisInstance = null;
let scrollerEl = null;
// A tiny helper: schedule a ScrollTrigger.refresh() on the next
// animation frame, de-duplicating calls within the same frame.
function scheduleRefresh() {
if (refreshScheduled || !window.ScrollTrigger) return;
refreshScheduled = true;
requestAnimationFrame(() => {
refreshScheduled = false;
window.ScrollTrigger.refresh();
});
}
function init() {
if (initialized) {
// Already booted — just re-measure, in case layout shifted while
// the page was inactive (e.g. user resized the window on Timeline).
scheduleRefresh();
return;
}
initialized = true;
// Guard: vendor libs must have loaded.
if (typeof window.gsap === 'undefined' ||
typeof window.ScrollTrigger === 'undefined' ||
typeof window.Lenis === 'undefined') {
console.warn('[bifrost] Vendor libraries (gsap/ScrollTrigger/Lenis) missing; skipping init.');
return;
}
const reduceMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
// Reveal-on-load elements: if reduced motion, just make them visible
// and bail before registering any ScrollTrigger-bound tweens.
if (reduceMotion) {
document.querySelectorAll('#page-overview [data-reveal], #page-overview [data-reveal-lines]').forEach(el => {
el.style.opacity = '1';
el.style.transform = 'none';
});
// The hero-wrap is hidden by CSS (`.js .hero-wrap { opacity: 0 }`)
// to prevent a flash during page activation — unhide it here since
// we're skipping the fade-in tween.
const heroWrap = document.querySelector('.hero-wrap');
if (heroWrap) heroWrap.style.opacity = '1';
// Still fade the Europe map fully in — it's the scene background.
const mapEl = document.getElementById('overview-globe');
if (mapEl) mapEl.style.opacity = '1';
return;
}
// ─── Scroller setup ──────────────────────────────────────────
//
// The Overview is a fixed-position .page that contains one
// scrollable child: `#overview-scroll`. All six scenes live
// inside it. Lenis drives wheel input on that element;
// ScrollTrigger reads scroll from the same element.
const scroller = document.getElementById('overview-scroll');
if (!scroller) {
console.error('[bifrost] #overview-scroll not found');
return;
}
scrollerEl = scroller;
const gsap = window.gsap;
const ScrollTrigger = window.ScrollTrigger;
const Lenis = window.Lenis;
gsap.registerPlugin(ScrollTrigger);
// Lenis wired to the Overview's internal scroller, NOT the window.
const lenis = new Lenis({
wrapper: scroller,
content: scroller.firstElementChild,
duration: 1.15,
easing: (t) => Math.min(1, 1.001 - Math.pow(2, -10 * t)),
smoothWheel: true,
wheelMultiplier: 1,
touchMultiplier: 1.5,
});
// Tell ScrollTrigger how to read/write scroll on this scroller.
ScrollTrigger.scrollerProxy(scroller, {
scrollTop(value) {
if (arguments.length) {
scroller.scrollTop = value;
}
return scroller.scrollTop;
},
getBoundingClientRect() {
// The scroller occupies the full viewport (inset: 0 on its parent).
return { top: 0, left: 0, width: window.innerWidth, height: window.innerHeight };
},
// Scrollbars are hidden via CSS; pinType is 'transform' for nested scrollers.
pinType: 'transform',
});
// Every ScrollTrigger below implicitly targets our scroller.
ScrollTrigger.defaults({ scroller });
// Pump Lenis via GSAP's ticker; notify ScrollTrigger on each scroll.
lenis.on('scroll', ScrollTrigger.update);
gsap.ticker.add((time) => lenis.raf(time * 1000));
gsap.ticker.lagSmoothing(0);
// Expose lenis to scrollTo() via the shared closure var.
lenisInstance = lenis;
// ─── Europe map fade ─────────────────────────────────────────
//
// Fully visible at scrollTop=0. Fades to 0 between 20% and 80%
// of viewport height. Fades back in on scrolling up. Opacity
// ceiling is 0.42 — matches the original .page-overview.is-active
// .overview-globe svg look.
const mapSvg = document.querySelector('#overview-globe svg');
const MAP_MAX_OPACITY = 0.42;
if (mapSvg) {
// Initial: visible (map is the hero backdrop). We'll drive opacity
// directly on every scroll tick, so kill any CSS opacity transition
// (the existing rule animates opacity over 900ms — would be janky).
mapSvg.style.transition = 'none';
mapSvg.style.opacity = MAP_MAX_OPACITY.toFixed(3);
}
function updateMapOpacity() {
if (!mapSvg) return;
const vh = window.innerHeight;
const y = scroller.scrollTop;
// Between 0.20 × vh and 0.80 × vh, ramp from full to zero.
const startFade = vh * 0.20;
const endFade = vh * 0.80;
let t;
if (y <= startFade) {
t = 0; // fully visible
} else if (y >= endFade) {
t = 1; // fully hidden
} else {
t = (y - startFade) / (endFade - startFade);
}
mapSvg.style.opacity = (MAP_MAX_OPACITY * (1 - t)).toFixed(3);
}
lenis.on('scroll', updateMapOpacity);
// Initial paint
updateMapOpacity();
// ─── Scroll-spy for the dot-nav ──────────────────────────────
//
// As the user scrolls through the Overview, update the active dot
// to match the scene currently in view. Called from lenis.on('scroll')
// at display rate; debounced implicitly by requestAnimationFrame
// through the shared refresh scheduler.
//
// Logic: a scene is "active" when its top is above the viewport's
// midpoint AND its bottom is below it. For stacked pinned scenes
// (S2) the pin duration makes "bottom" go well past the viewport,
// so the first-match wins — scenes are checked top-to-bottom.
const sceneOrder = [
'hero', 'stack-scene', 'words-scene',
'bifrost', 'bifrost-meaning', 'bifrost-join',
];
let lastActiveScene = null;
function updateActiveSceneDot() {
if (typeof window.__setActiveDot !== 'function') return;
const midY = window.innerHeight * 0.5;
let visibleId = sceneOrder[0];
for (const id of sceneOrder) {
const el = document.getElementById(id);
if (!el) continue;
const r = el.getBoundingClientRect();
// A scene whose top is at or above the midline, but whose
// bottom hasn't scrolled past the midline yet.
if (r.top <= midY && r.bottom > midY) {
visibleId = id;
break;
}
// Edge case: scrolled past — keep latest seen as fallback.
if (r.top <= midY) visibleId = id;
}
if (visibleId !== lastActiveScene) {
lastActiveScene = visibleId;
window.__setActiveDot('page-overview', visibleId);
}
}
lenis.on('scroll', updateActiveSceneDot);
// Initial paint: set "hero" active since we start at top.
requestAnimationFrame(updateActiveSceneDot);
// ─── Topography parallax ─────────────────────────────────────
//
// Concentric-ring topographic layer that sits behind the Europe
// map (z-index 0). Generated at runtime — same formula as the
// entrance page's .currents pattern but rotated/offset so it reads
// as a visual sibling rather than a duplicate.
//
// Parallax speed: 0.15× of the scroller's scrollTop. Slow enough to
// feel atmospheric, fast enough that the layer doesn't appear
// static on casual scroll. Applied as a translateY composed WITH
// the 40° rotate from CSS (so we build the full transform here to
// avoid clobbering the CSS rotate).
const topoWrap = document.getElementById('overview-topography');
if (topoWrap && !topoWrap.querySelector('svg')) {
const svgNS = 'http://www.w3.org/2000/svg';
const svg = document.createElementNS(svgNS, 'svg');
const W = 1600, H = 1600, cx = W * 0.5, cy = H * 0.5;
svg.setAttribute('viewBox', `0 0 ${W} ${H}`);
svg.setAttribute('preserveAspectRatio', 'xMidYMid meet');
// Slightly different parameters from the entrance page's currents
// so the rings read as "related but not identical":
// - more rings (34 vs 26) — denser
// - smaller step (28 vs 32) — tighter
// - larger amplitude (32 vs 26) — wavier
// - lower base opacity — quieter behind the map
const RINGS = 34, BASE_R = 60, STEP = 28, AMP = 32;
for (let i = 0; i < RINGS; i++) {
const r = BASE_R + i * STEP, segs = 280;
const p1 = (i * 0.7) % (Math.PI * 2);
const p2 = (i * 1.4 + 1.3) % (Math.PI * 2);
const a1 = AMP * (0.9 + (i % 5) * 0.08);
const a2 = AMP * 0.35;
let d = '';
for (let s = 0; s <= segs; s++) {
const t = (s / segs) * Math.PI * 2;
const rr = r + a1 * Math.sin(t * 3 + p1 + i * 0.15)
+ a2 * Math.sin(t * 5 + p2 + i * 0.22)
+ AMP * 0.18 * Math.sin(t * 7 + i);
const x = cx + Math.cos(t) * rr;
const y = cy + Math.sin(t) * rr * 0.92;
d += (s === 0 ? 'M' : 'L') + x.toFixed(1) + ' ' + y.toFixed(1);
}
d += ' Z';
const path = document.createElementNS(svgNS, 'path');
path.setAttribute('d', d);
path.setAttribute('fill', 'none');
path.setAttribute('stroke', '#383831');
path.setAttribute('stroke-width', '1');
path.setAttribute('stroke-linejoin', 'round');
// Lower opacity than entrance page — sits behind the map,
// shouldn't compete for attention.
path.setAttribute('opacity', (i % 3 === 0 ? 0.07 : 0.04).toString());
svg.appendChild(path);
}
topoWrap.appendChild(svg);
}
const PARALLAX_SPEED = 0.15;
const topoSvg = topoWrap ? topoWrap.querySelector('svg') : null;
function updateTopographyParallax() {
if (!topoSvg) return;
const y = scroller.scrollTop * -PARALLAX_SPEED;
// Rotate comes from CSS (40deg); we compose our translateY into
// the same transform string so both apply. `rotate` first so the
// translate happens in screen space, not the rotated local space.
topoSvg.style.transform = `translateY(${y.toFixed(1)}px) rotate(40deg)`;
}
lenis.on('scroll', updateTopographyParallax);
// Initial paint
updateTopographyParallax();
// ─── Sticky-scroll damping ───────────────────────────────────
//
// When a scene's vertical center is close to the viewport center,
// damp Lenis's velocity briefly — scenes "catch" the eye instead
// of flying past at full scroll speed. Applied only to non-pinned
// scenes (S1, S3, S4, S5, S6). S2 is already pinned + scrubbed
// by GSAP ScrollTrigger; adding damping on top would make its
// card-fall feel like a drag.
//
// Implementation: on each scroll tick, if the active scene is in
// the "damp zone" (±20% of viewport height from viewport center),
// scale Lenis's next frame velocity by a damping factor (0.82).
// When outside the zone, pass through unchanged. Keeps power-users
// happy — they can still scroll fast, just feel a soft hold at
// scene boundaries.
const STICKY_SCENES = new Set([
'hero', 'words-scene', 'bifrost', 'bifrost-meaning', 'bifrost-join',
]); // note: 'stack-scene' deliberately excluded (already pinned)
const DAMP_ZONE_VH = 0.20; // ±20% of viewport height from center
const DAMP_FACTOR = 0.82; // multiply velocity while in zone
const DAMP_MAX_MS = 300; // cap: never damp for longer than this per scene-crossing
let dampedUntil = 0; // timestamp (ms); damping active while > now
let lastDampedScene = null; // id of the scene we last entered
function updateStickyDamping() {
const now = performance.now();
const midY = window.innerHeight * 0.5;
const zone = window.innerHeight * DAMP_ZONE_VH;
let inZone = false, zoneScene = null;
for (const id of STICKY_SCENES) {
const el = document.getElementById(id);
if (!el) continue;
const r = el.getBoundingClientRect();
// Use the scene's vertical midpoint as the "attractor."
const sceneMid = (r.top + r.bottom) * 0.5;
if (Math.abs(sceneMid - midY) < zone) {
inZone = true;
zoneScene = id;
break;
}
}
if (inZone) {
// New scene entered the zone → arm a fresh damping window.
// Reusing the same scene (still in zone, already damped) doesn't
// extend — DAMP_MAX_MS is a hard cap per entry to avoid an
// indefinite hold.
if (zoneScene !== lastDampedScene) {
lastDampedScene = zoneScene;
dampedUntil = now + DAMP_MAX_MS;
}
if (now < dampedUntil && lenis.velocity) {
// Lenis exposes .velocity (a number). Multiplying in place
// dampens the next-frame step. Small, contained effect — no
// chance of interfering with ScrollTrigger.
lenis.velocity *= DAMP_FACTOR;
}
} else {
// Left the zone — reset so the NEXT time we enter a scene,
// we get a fresh damping window.
if (lastDampedScene !== null) {
lastDampedScene = null;
dampedUntil = 0;
}
}
}
lenis.on('scroll', updateStickyDamping);
// ─── Site-2 scene animations ─────────────────────────────────
// (transplanted verbatim; all ScrollTriggers below automatically
// use the Overview scroller via ScrollTrigger.defaults above.)
// Script 1 body — HERO + SCENE 2 (architecture stack) + SCENE 3 (words) + SCENE 4 (bifrost arc)
/* -------------------------------------------------------------
HERO — single overall fade-in. The wrap is hidden via CSS
(`.js .hero-wrap { opacity: 0 }`) so the hero stays invisible
during the page-activation transition, then fades in once
Bifrost has booted.
------------------------------------------------------------- */
gsap.to('.hero-wrap', {
opacity: 1,
duration: 1.0,
ease: 'power2.out',
delay: 0.1,
});
/* -------------------------------------------------------------
ARCHITECTURE — two-phase scrubbed sequence
Phase A (0.00 – 0.45): each of 4 layer-cards falls from above
and lands at a progressively higher Y offset so the previous
card's bottom strip peeks out below. Only the topmost card's
eyebrow is visible at any time.
Phase B (0.50 – 1.00): the stack rearranges into a 2x2 grid on
the right side. Body text in each card fades out; eyebrow
stays. Explanatory copy crossfades on the LEFT, three panels:
~0.55 "All the capabilities to solve business use cases"
~0.70 "Full client control / Complete sovereignty"
~0.85 "Built in Denmark / For Europe"
------------------------------------------------------------- */
const theatre = document.querySelector('.layer-theatre');
const cards = gsap.utils.toArray('.layer-card');
const copyLayers = gsap.utils.toArray('.copy-layer');
// Each card lands N pixels higher than the previous — previous's
// bottom strip is visible below.
const STACK_OFFSET_PER_CARD = 22; // px, upward
// Compute grid target positions. In .in-grid mode, each card-box is
// 20vw square and centered (via margin:auto) inside its full-width
// parent .layer-card. We translate the parent card so the box lands
// at the correct grid-cell position.
function computeGridPlan() {
const W = theatre.offsetWidth;
const H = theatre.offsetHeight;
const vw = window.innerWidth;
const cellSize = vw * 0.17; // matches .in-grid .card-box width (17vw)
const gap = Math.max(14, vw * 0.014);
const totalW = 2 * cellSize + gap;
const totalH = 2 * cellSize + gap;
// Right-anchor grid so it sits flush with the right side of the theatre
const gridRight = W * 0.99;
const gridStartX = gridRight - totalW;
const gridStartY = (H - totalH) / 2;
// Grid cell centers (in theatre coordinates), reading order: TL, TR, BL, BR
const centers = [
{ cx: gridStartX + cellSize / 2, cy: gridStartY + cellSize / 2 },
{ cx: gridStartX + cellSize / 2 + cellSize + gap, cy: gridStartY + cellSize / 2 },
{ cx: gridStartX + cellSize / 2, cy: gridStartY + cellSize / 2 + cellSize + gap },
{ cx: gridStartX + cellSize / 2 + cellSize + gap, cy: gridStartY + cellSize / 2 + cellSize + gap },
];
// In grid mode the card-box's horizontal center is the theatre horizontal
// center (via margin:auto). That's our anchor for dx computations.
const theatreCx = W / 2;
const theatreCy = H / 2;
return { cellSize, theatreCx, theatreCy, centers };
}
// Initial state — hide everything, set card translations.
// Cards are positioned via left:0/right:0 + top:50% in CSS; we use
// yPercent:-50 to center vertically (so `y` animations remain additive).
cards.forEach((card, i) => {
gsap.set(card, { xPercent: 0, yPercent: -50, opacity: 0, x: 0, y: 0, rotation: 0, scale: 1 });
gsap.set(card.querySelector('.card-eyebrow'), { opacity: 0 });
});
// Copy layers vertically centered in copy-stage via yPercent: -50.
// The animation uses `y` for the little drop-in offset (which is additive
// to yPercent, so centering is preserved).
copyLayers.forEach(el => gsap.set(el, { yPercent: -50, opacity: 0, y: 20 }));
const stackTl = gsap.timeline({
scrollTrigger: {
trigger: '#stack-scene',
start: 'top top',
end: '+=5000', // 5.5 viewports — more scroll for the new sequence
scrub: 0.6,
pin: '.stack-pin',
pinSpacing: true,
anticipatePin: 1,
invalidateOnRefresh: true,
}
});
// -------- Phase A: card landings --------
// Card i lands at y = -i * STACK_OFFSET_PER_CARD (above baseline).
// Its eyebrow fades IN on landing; the previous card's eyebrow fades OUT.
cards.forEach((card, i) => {
const landingY = -i * STACK_OFFSET_PER_CARD;
const t = i * 0.105; // each card gets ~10.5% of timeline
// Y motion — starts above viewport. Distance reduced to -900 so the
// visible portion of the fall (from viewport top down to landing) is
// a meaningful share of the animation rather than being swallowed by
// off-screen travel that the user never sees.
stackTl
.fromTo(card,
{ y: -900, rotation: (i % 2 === 0 ? -4 : 4), scale: 0.97 },
{ y: landingY, rotation: 0, scale: 1, duration: 0.09, ease: 'power3.out' },
t);
// Opacity ramps up across most of the fall so the user sees the card
// traveling rather than just popping in at the end.
stackTl.fromTo(card,
{ opacity: 0 },
{ opacity: 1, duration: 0.065, ease: 'power2.out' },
t + 0.015);
// Settle bounce
stackTl
.to(card, { y: landingY + 4, duration: 0.012, ease: 'power1.out' }, t + 0.092)
.to(card, { y: landingY, duration: 0.02, ease: 'power2.inOut' }, t + 0.105);
// This card's eyebrow fades in
stackTl.to(card.querySelector('.card-eyebrow'),
{ opacity: 1, duration: 0.025, ease: 'power2.out' },
t + 0.06);
// Previous card's eyebrow fades out (it's now covered)
if (i > 0) {
stackTl.to(cards[i - 1].querySelector('.card-eyebrow'),
{ opacity: 0, duration: 0.02, ease: 'power2.in' },
t);
}
});
// Short hold after all 4 have landed (0.42 to 0.50)
// -------- Phase B: rearrange to grid + fade copy --------
// Phase A's 4th card (Agents) finishes its fade-in around timeline 0.42,
// but Lenis + scrub:0.6 adds smoothing so visually cards settle around
// 0.55 of scroll progress. Starting Phase B at 0.58 ensures the user
// sees the complete stack briefly before the grid morph begins.
const PHASE_B_START = 0.58;
// Transition each card to its grid cell. The .in-grid class
// (applied via a separate ScrollTrigger at Phase B start) restructures
// each card-box into a 30vw square centered within its full-width card.
// GSAP only needs to translate — scale stays 1.
//
// The card's effective visual center in grid phase is the card-box's
// center, which is the theatre horizontal center (margin:auto). So
// dx = targetCellCenterX − theatreCenterX, dy = same for Y.
function scheduleGridTransition() {
const plan = computeGridPlan();
// Target scales for the morph. Cards start as wide rectangles
// (~1324×526 at 1440vw) and need to morph to squares (~288×288).
// Using independent scaleX/scaleY lets the rectangle SHAPE-CHANGE
// into a square as it shrinks — so at morph-end the pre-snap and
// post-snap aspect ratios match and the .in-grid CSS handoff is
// imperceptible. Without this, ending at uniform scale would leave
// a flat 2.5:1 rectangle that pops to a 1:1 square on snap.
const vw = window.innerWidth;
const cardRect = cards[0].getBoundingClientRect();
const cardW = cardRect.width || vw;
const cardH = cardRect.height || 600;
const targetW = vw * 0.17; // matches .in-grid .card-box width (17vw)
const targetH = targetW; // square
const targetScaleX = targetW / cardW;
const targetScaleY = targetH / cardH;
cards.forEach((card, i) => {
const target = plan.centers[i];
const dx = target.cx - plan.theatreCx;
const dy = target.cy - plan.theatreCy;
const content = card.querySelector('.card-content');
const gridLabel = card.querySelector('.card-grid-label');
const brain = card.querySelector('.card-brain');
// Translate card to grid-cell position AND morph its SHAPE from
// wide rectangle to square via independent scaleX/scaleY. Ending
// at the exact target aspect ratio means the CSS .in-grid snap
// (where card-box becomes aspect-ratio 1:1) produces no visual
// change — the user sees a continuous morph.
stackTl.to(card,
{ x: dx, y: dy,
scaleX: targetScaleX, scaleY: targetScaleY,
rotation: 0,
duration: 0.14, ease: 'power2.inOut',
transformOrigin: 'center center' },
PHASE_B_START);
// COUNTER-SCALE the brain to prevent it being visually squeezed
// by the card's non-uniform scale. Without this, the brain would
// appear horizontally compressed (stretched tall/narrow) during
// the morph because scaleX (0.22) is 2.5× more compressed than
// scaleY (0.55).
//
// Applying additional scaleX = targetScaleY / targetScaleX (~2.5)
// to the brain combines with the card's scale multiplicatively:
// brain.visual.scaleX = card.scaleX × brain.scaleX
// = 0.22 × 2.5 = 0.55 = card.scaleY
// giving the brain UNIFORM visual scaling (both axes reduced by
// card.scaleY factor), preserving its natural aspect ratio.
//
// Using transformOrigin: 'right center' on the brain keeps its
// right edge anchored and expands the scale LEFTWARD into the
// card's interior — not rightward into blank space or adjacent
// cards. The brain already sits on the right side of the card
// (grid column), so this keeps it where the user expects it.
//
// Content (title+body) and grid-label are NOT counter-scaled —
// content fades to 0 opacity early in the morph, masking any
// distortion; grid-label is tiny text, distortion barely visible.
const counterScaleX = targetScaleY / targetScaleX;
stackTl.to(brain,
{ scaleX: counterScaleX,
duration: 0.14, ease: 'power2.inOut',
transformOrigin: 'right center',
immediateRender: false },
PHASE_B_START);
// INSTANT scale reset at the end of the morph window. Using a
// tiny duration (0.00001) with immediateRender:false means scale
// jumps from targetScale to 1 essentially in a single scrub frame
// — no visible ramp (0.00001 of a 1-second timeline is far below
// one render frame). Piggy-back the .in-grid CSS class toggle on
// the FIRST card's scale-reset tween via onStart (forward) and
// onReverseComplete (backward), so the scale snap and the class
// apply happen in the same GSAP render pass. Previously the class
// toggle was a separate tween or a separate ScrollTrigger; either
// way GSAP and ScrollTrigger didn't guarantee same-frame
// execution, producing a visible moment where scale=1 but
// box=1324 (the "becomes large briefly" glitch the user saw).
const resetVars = {
scaleX: 1, scaleY: 1,
duration: 0.00001,
immediateRender: false,
};
if (i === 0) {
resetVars.onStart = function() {
theatre.classList.add('in-grid');
};
resetVars.onReverseComplete = function() {
theatre.classList.remove('in-grid');
};
}
stackTl.to(card, resetVars, PHASE_B_START + 0.14);
// Reset brain counter-scale atomically with the card's scale
// snap. After this, CSS .in-grid takes over layout (brain fills
// the square flex-column centered, with no inline scaleX).
stackTl.to(brain,
{ scaleX: 1, duration: 0.00001, immediateRender: false },
PHASE_B_START + 0.14);
// Crossfade: the old text content fades out while the grid label
// fades in. Both run alongside the scale/translate so all changes
// happen simultaneously as a single coherent morph.
stackTl.to(content,
{ opacity: 0, duration: 0.08, ease: 'power2.in' },
PHASE_B_START);
stackTl.to(gridLabel,
{ opacity: 0.88, duration: 0.08, ease: 'power2.out' },
PHASE_B_START + 0.06);
// Fade the outside-box eyebrow out as we transition to grid.
stackTl.to(card.querySelector('.card-eyebrow'),
{ opacity: 0, duration: 0.06, ease: 'power2.in' },
PHASE_B_START);
});
}
scheduleGridTransition();
// (Class-toggle is now piggy-backed on card[0]'s scale-reset tween
// above — see the i === 0 branch. Keeping them on the same tween
// guarantees they fire in the same GSAP render pass.)
// On resize we need to recompute. ScrollTrigger.invalidateOnRefresh
// only rebuilds positions if our tweens use function-based values or
// we kill/rebuild. Simplest: rebuild timeline entirely on resize.
let resizeTimer;
window.addEventListener('resize', () => {
clearTimeout(resizeTimer);
resizeTimer = setTimeout(() => ScrollTrigger.refresh(), 250);
});
// -------- Copy layer crossfade on the LEFT (during grid phase) --------
const FADE = 0.025;
const swap = (fromIdx, toIdx, pos) => {
if (fromIdx !== null) {
stackTl.to(copyLayers[fromIdx], { opacity: 0, y: -14, duration: FADE, ease: 'power2.in' }, pos);
}
stackTl.fromTo(copyLayers[toIdx],
{ opacity: 0, y: 16 },
{ opacity: 1, y: 0, duration: FADE, ease: 'power2.out' },
pos + FADE + 0.002);
};
// 3 panels: capabilities → sovereignty → Denmark
stackTl.fromTo(copyLayers[0],
{ opacity: 0, y: 16 },
{ opacity: 1, y: 0, duration: FADE * 1.5, ease: 'power2.out' },
PHASE_B_START + 0.08);
swap(0, 1, 0.77); // sovereignty
swap(1, 2, 0.90); // Denmark
// Clean exit: fade the whole stack-pin contents just before the pin
// releases, so the scroll gap before #words-scene shows clean paper
// rather than stack content receding away.
stackTl.to('.layer-theatre', { opacity: 0, duration: 0.03, ease: 'power2.in' }, 0.97);
/* -------------------------------------------------------------
SCENE 3 — WORDS fly in one at a time, driven by scroll
------------------------------------------------------------- */
// Before capturing the .words spans, rebuild the sentence with the
// user's first name if we have one. window.__fenjaFirstName is set
// by timeline.js's /auth/me fetch. Falls back to the no-name variant
// already in the DOM (see public/entrance.html's static fallback).
//
// Sentence shape:
// With name: "This is why we've invited you, Erik.
// To ensure Fenja AI is not just built for you — but
// with you."
// No name: "This is why we've invited you. To ensure
// Fenja AI is not just built for you — but
// with you."
//
// We rebuild the .words paragraph in place. The hi-classed spans are
// the ones that fly in from center with extra weight (see below).
(function rebuildWordsSentence() {
const wordsP = document.getElementById('words-sentence');
if (!wordsP) return;
const firstName = (typeof window.__fenjaFirstName === 'string')
? window.__fenjaFirstName.trim()
: null;
// Build the token list. Each token is { text, hi }. Whitespace
// between tokens is handled by natural text-wrap — each .w has
// `display: inline-block` plus normal spacing between siblings.
let tokens;
if (firstName) {
tokens = [
{ text: 'This' }, { text: 'is' }, { text: 'why' },
{ text: 'we\u2019ve' }, { text: 'invited' }, { text: 'you,' },
{ text: firstName + '.', hi: true },
{ text: 'To' }, { text: 'ensure' }, { text: 'Fenja' },
{ text: 'AI' }, { text: 'is' }, { text: 'not' },
{ text: 'just' }, { text: 'built' }, { text: 'for' },
{ text: 'you' }, { text: '\u2014' }, { text: 'but' },
{ text: 'with', hi: true }, { text: 'you.', hi: true },
];
} else {
// No name — structurally identical layout so the same fly-in
// curves work without retuning. "you." after "invited" gets .hi
// to carry the weight the name would've carried.
tokens = [
{ text: 'This' }, { text: 'is' }, { text: 'why' },
{ text: 'we\u2019ve' }, { text: 'invited' },
{ text: 'you.', hi: true },
{ text: 'To' }, { text: 'ensure' }, { text: 'Fenja' },
{ text: 'AI' }, { text: 'is' }, { text: 'not' },
{ text: 'just' }, { text: 'built' }, { text: 'for' },
{ text: 'you' }, { text: '\u2014' }, { text: 'but' },
{ text: 'with', hi: true }, { text: 'you.', hi: true },
];
}
// Flush the fallback content, rebuild. Using explicit createElement
// rather than innerHTML so firstName is never HTML-interpolated.
wordsP.textContent = '';
tokens.forEach((t, i) => {
const span = document.createElement('span');
span.className = t.hi ? 'w hi' : 'w';
span.textContent = t.text;
wordsP.appendChild(span);
// Preserve natural whitespace between tokens (critical for text-wrap).
if (i < tokens.length - 1) wordsP.appendChild(document.createTextNode(' '));
});
})();
const wordEls = gsap.utils.toArray('.words .w');
// Give each word a random fly-in vector (stable per word), and a scale pop.
// The "with them" words (marked .hi) come in from center with more weight.
const rnd = (i, seed) => {
// simple deterministic pseudo-random so layout is stable per word
const s = Math.sin((i + 1) * seed) * 10000;
return s - Math.floor(s);
};
wordEls.forEach((w, i) => {
const hi = w.classList.contains('hi');
const fromX = hi ? 0 : (rnd(i, 12.9898) - 0.5) * 220;
const fromY = hi ? 80 : (rnd(i, 78.233) - 0.5) * 160;
const rot = hi ? 0 : (rnd(i, 37.719) - 0.5) * 16;
gsap.set(w, {
opacity: 0,
x: fromX,
y: fromY,
rotate: rot,
scale: hi ? 1.05 : 0.9,
filter: 'blur(6px)',
});
});
const wordsTl = gsap.timeline({
scrollTrigger: {
trigger: '#words-scene',
start: 'top top',
end: 'bottom bottom',
scrub: 0.4,
}
});
wordEls.forEach((w, i) => {
const hi = w.classList.contains('hi');
const dur = hi ? 0.14 : 0.1;
wordsTl.to(w, {
opacity: 1,
x: 0, y: 0, rotate: 0,
scale: 1,
filter: 'blur(0px)',
duration: dur,
ease: 'power3.out',
}, i * 0.055);
if (hi) {
wordsTl.to(w, { scale: 1.0, duration: 0.05 }, '>-0.02');
}
});
/* -------------------------------------------------------------
SCENE 4 — PROJECT BIFROST REVEAL
Arc draws in, then the words settle.
------------------------------------------------------------- */
const arcMain = document.getElementById('arcMain');
const arcThin = document.getElementById('arcThin');
const arcHalo = document.getElementById('arcHalo');
[arcMain, arcThin, arcHalo].forEach(el => {
if (!el) return;
const len = el.getTotalLength();
el.style.strokeDasharray = len;
el.style.strokeDashoffset = len;
});
const tokens = gsap.utils.toArray('.bifrost-name .token');
tokens.forEach((t, i) => {
gsap.set(t, { opacity: 0, y: 40, filter: 'blur(10px)' });
});
const bifrostTl = gsap.timeline({
scrollTrigger: {
trigger: '#bifrost',
start: 'top top',
end: 'bottom bottom',
scrub: 0.6,
}
});
bifrostTl
.to('.arc-wrap', { opacity: 1, duration: 0.1, ease: 'power2.out' }, 0.02)
.to(arcHalo, { strokeDashoffset: 0, duration: 0.45, ease: 'power2.inOut' }, 0.02)
.to(arcMain, { strokeDashoffset: 0, duration: 0.5, ease: 'power2.inOut' }, 0.05)
.to(arcThin, { strokeDashoffset: 0, duration: 0.45, ease: 'power2.inOut' }, 0.12)
.to('.bifrost-eyebrow', { opacity: 1, y: 0, duration: 0.1, ease: 'power2.out' }, 0.30)
.fromTo('.bifrost-eyebrow', { y: 20 }, { y: 0, duration: 0.1 }, 0.30)
.to(tokens[0], { opacity: 1, y: 0, filter: 'blur(0px)', duration: 0.15, ease: 'power3.out' }, 0.40)
.to(tokens[1], { opacity: 1, y: 0, filter: 'blur(0px)', duration: 0.2, ease: 'power3.out' }, 0.50)
.to('.bifrost-sub', { opacity: 1, y: 0, duration: 0.15, ease: 'power2.out' }, 0.68)
.fromTo('.bifrost-sub', { y: 20 }, { y: 0, duration: 0.15 }, 0.68);
// Slight parallax on the arc while the user continues to scroll
bifrostTl.to('.arc-wrap', { y: -40, duration: 0.3, ease: 'none' }, 0.5);
/* -------------------------------------------------------------
On load — kick hero animation
------------------------------------------------------------- */
// Ensure ScrollTrigger measures correctly after fonts load.
if (document.fonts && document.fonts.ready) {
document.fonts.ready.then(() => ScrollTrigger.refresh());
}
// Script 2 body — SCENE 5 (treasure-map) + SCENE 6 (join CTA + footer)
/* =================================================================
PROJECT BIFROST — "What it means" treasure-map + summary cards.
Self-contained additive IIFE. Reads the global `gsap` and
`ScrollTrigger` registered by the existing scripts above; does
not touch any pre-existing timelines or DOM nodes.
================================================================= */
/* -------------------------------------------------------------
SCENE 5 — Treasure-map path draw + per-stop reveals
------------------------------------------------------------- */
// -------- Build the path geometry from actual dot positions --------
//
// The treasure-map path needs to thread cleanly through each dot.
// The dots are positioned by CSS grid/flex, so their Y positions in
// the canvas depend on the rendered height of each stop's content
// (which varies with viewport width and font metrics). We compute
// the path here AFTER layout, so it always passes through the dots.
//
// Coordinate system: the SVG viewBox is "0 0 100 200" with
// preserveAspectRatio="none", so X is normalised to canvas width
// and Y to canvas height. We measure each dot's centre in canvas
// coordinates, normalise, and emit a chain of cubic bezier segments
// — each one bowing out to alternating sides for a meandering feel.
const mapCanvasEl = document.querySelector('.map-canvas');
const pathBg = document.getElementById('mapPathBg');
const pathDraw = document.getElementById('mapPathDraw');
let drawScrollTrigger = null;
function buildMapPath() {
if (!mapCanvasEl || !pathDraw || !pathBg) return;
const dots = mapCanvasEl.querySelectorAll('.dot-anchor');
if (dots.length < 2) return;
const cb = mapCanvasEl.getBoundingClientRect();
if (cb.width === 0 || cb.height === 0) return;
// Normalise dot centres to viewBox units (0-100 X, 0-200 Y)
const pts = Array.from(dots).map((d) => {
const r = d.getBoundingClientRect();
return {
x: ((r.left + r.width / 2 - cb.left) / cb.width) * 100,
y: ((r.top + r.height / 2 - cb.top) / cb.height) * 200,
};
});
// Build path: M to first, then cubic beziers to each subsequent
// dot. Control points sit at the same X as the dots (so the path
// exits/enters each dot along the vertical axis) but bow out to
// alternating sides between them — gives a Nordic-river feel.
const segs = [`M ${pts[0].x.toFixed(2)} ${pts[0].y.toFixed(2)}`];
for (let i = 1; i < pts.length; i++) {
const a = pts[i - 1];
const b = pts[i];
// Bow direction alternates by segment index. Amplitude is in
// viewBox X units (0-100) — clamped down on tall segments to
// avoid the path drifting outside the canvas.
const bowDir = (i % 2 === 1) ? 1 : -1;
const bowAmount = Math.min(20, (b.y - a.y) * 0.18);
const cx1 = 50 + bowAmount * bowDir;
const cy1 = a.y + (b.y - a.y) * 0.35;
const cx2 = 50 + bowAmount * bowDir;
const cy2 = a.y + (b.y - a.y) * 0.65;
segs.push(`C ${cx1.toFixed(2)} ${cy1.toFixed(2)}, ${cx2.toFixed(2)} ${cy2.toFixed(2)}, ${b.x.toFixed(2)} ${b.y.toFixed(2)}`);
}
const d = segs.join(' ');
pathBg.setAttribute('d', d);
pathDraw.setAttribute('d', d);
// Re-measure the drawn path's length and reset the dash offset
// so the draw-in animation covers the full new geometry.
const len = pathDraw.getTotalLength();
pathDraw.style.strokeDasharray = len;
// If the scroll-trigger animation already played to completion,
// keep the path drawn; otherwise hide it pending scroll.
const trig = drawScrollTrigger;
if (trig && trig.progress >= 1) {
pathDraw.style.strokeDashoffset = 0;
} else {
pathDraw.style.strokeDashoffset = len;
}
}
// Build initially after a paint
requestAnimationFrame(buildMapPath);
// Animate the accent path drawing in as the user scrolls down
// through the meaning section
if (pathDraw) {
const tween = gsap.to(pathDraw, {
strokeDashoffset: 0,
ease: 'none',
scrollTrigger: {
trigger: '#bifrost-meaning',
start: 'top 65%',
end: 'bottom 75%',
scrub: 0.6,
invalidateOnRefresh: true,
onRefresh: () => {
// Re-measure dasharray on every ScrollTrigger refresh so
// the animation stays in sync with any path changes
const len = pathDraw.getTotalLength();
pathDraw.style.strokeDasharray = len;
},
}
});
drawScrollTrigger = tween.scrollTrigger;
}
// Rebuild the path on resize (debounced) since dot positions move
let mapPathResizeTimer;
window.addEventListener('resize', () => {
clearTimeout(mapPathResizeTimer);
mapPathResizeTimer = setTimeout(() => {
buildMapPath();
ScrollTrigger.refresh();
}, 220);
});
// Mobile fallback — the SVG path is hidden and replaced by a CSS
// pseudo-element rail. Drive its progress with a CSS custom prop
// so the same scroll range animates a vertical fill.
const mapCanvas = document.querySelector('.map-canvas');
if (mapCanvas) {
const railObj = { p: 0 };
gsap.to(railObj, {
p: 100,
ease: 'none',
scrollTrigger: {
trigger: '#bifrost-meaning',
start: 'top 65%',
end: 'bottom 75%',
scrub: 0.6,
onUpdate: () => {
mapCanvas.style.setProperty('--rail-progress', railObj.p + '%');
}
}
});
}
// Per-stop reveal — dot pops in first, then content + image rise
// and fade in alongside each other. ToggleActions: play forward
// when entering, reverse when scrolling back up past the trigger.
gsap.utils.toArray('.map-stop').forEach((stop) => {
const dot = stop.querySelector('.dot');
const contentBits = stop.querySelectorAll('.stop-content > *');
const image = stop.querySelector('.stop-image');
const tl = gsap.timeline({
scrollTrigger: {
trigger: stop,
start: 'top 78%',
toggleActions: 'play none none reverse',
}
});
// Dot pops in with a subtle back ease — feels like a pin
// dropping into the map
if (dot) {
tl.to(dot, {
scale: 1, opacity: 1,
duration: 0.55, ease: 'back.out(2)',
});
}
// Text bits stagger in
if (contentBits.length) {
tl.to(contentBits, {
opacity: 1, y: 0,
duration: 0.7, stagger: 0.08,
ease: 'power3.out',
}, '-=0.35');
}
// Image animates in alongside the text (overlapping for unity)
if (image) {
tl.to(image, {
opacity: 1, y: 0,
duration: 0.9,
ease: 'power3.out',
}, '-=0.6');
}
});
/* -------------------------------------------------------------
SCENE 6 — Join section: scroll-triggered reveals + CTA click
------------------------------------------------------------- */
// Reveal the CTA panel when the section scrolls into view.
// Captured to a variable so the click handler can kill this
// ScrollTrigger once the user has joined — otherwise scrolling up
// and back down would re-play the reveal and the CTA would fade
// back in over the confirmation.
const ctaRevealTween = gsap.to('.join-cta', {
opacity: 1, y: 0,
duration: 0.9, ease: 'power3.out',
scrollTrigger: {
trigger: '#bifrost-join',
start: 'top 70%',
toggleActions: 'play none none reverse',
}
});
// Reveal the three footer marks in sequence
gsap.to('.join-footer > *', {
opacity: 1, y: 0,
duration: 0.8, stagger: 0.14,
ease: 'power3.out',
scrollTrigger: {
trigger: '.join-footer',
start: 'top 88%',
toggleActions: 'play none none reverse',
}
});
// CTA click handler — crossfade CTA out, confirmation in, then stagger
// the checkmarks on each list item so the list feels like it's
// filling in as the user reads it.
const joinBtn = document.getElementById('joinBtn');
const joinCTA = document.getElementById('joinCTA');
const joinConfirm = document.getElementById('joinConfirm');
if (joinBtn && joinCTA && joinConfirm) {
joinBtn.addEventListener('click', () => {
if (joinBtn.disabled) return;
joinBtn.disabled = true;
// Record the click on the server. Fire-and-forget — the UI
// transitions below run regardless of network outcome so a
// temporary failure doesn't trap the user in a broken state.
// The server uses INSERT OR IGNORE keyed on email, so repeat
// clicks from the same user are safely deduplicated.
fetch('/api/bifrost-join', {
method: 'POST',
credentials: 'same-origin',
}).catch(() => {
// Network/server error — intentionally swallowed. An admin
// listing missing entries can follow up out-of-band.
});
// Kill the CTA's scroll-reveal trigger so scrolling up + back
// down can't replay the reveal and bring the CTA back over the
// confirmation. After click, the CTA stays in whatever state
// the click-timeline puts it in (fading out, then hidden).
if (ctaRevealTween && ctaRevealTween.scrollTrigger) {
ctaRevealTween.scrollTrigger.kill();
}
const items = joinConfirm.querySelectorAll('.confirm-list li');
const tl = gsap.timeline();
// Fade the CTA out
tl.to(joinCTA, {
opacity: 0, y: -16,
duration: 0.5, ease: 'power2.in',
onComplete: () => {
joinCTA.setAttribute('aria-hidden', 'true');
joinCTA.style.pointerEvents = 'none';
}
});
// Fade the confirmation in
tl.fromTo(joinConfirm,
{ opacity: 0, y: 16 },
{
opacity: 1, y: 0,
duration: 0.7, ease: 'power3.out',
onStart: () => {
joinConfirm.setAttribute('aria-hidden', 'false');
joinConfirm.style.pointerEvents = 'auto';
},
}, '-=0.1');
// Stagger the circle+check markers by toggling `.is-checked`
// on each list item — CSS handles the pop-in transition.
items.forEach((li, i) => {
gsap.delayedCall(0.45 + i * 0.16, () => {
li.classList.add('is-checked');
});
});
});
}
/* -------------------------------------------------------------
Refresh ScrollTrigger after fonts and images load so positions
are accurate — large embedded illustrations affect layout.
------------------------------------------------------------- */
if (document.fonts && document.fonts.ready) {
document.fonts.ready.then(() => ScrollTrigger.refresh());
}
// Refresh once illustrations have laid out
const illustrations = document.querySelectorAll('#bifrost-meaning img');
let pending = illustrations.length;
if (pending === 0) ScrollTrigger.refresh();
illustrations.forEach((img) => {
if (img.complete) {
if (--pending === 0) ScrollTrigger.refresh();
} else {
img.addEventListener('load', () => { if (--pending === 0) ScrollTrigger.refresh(); });
img.addEventListener('error', () => { if (--pending === 0) ScrollTrigger.refresh(); });
}
});
// ─── One consolidated resize handler ─────────────────────────
// Site 2 had two separate resize listeners; we defer to ScrollTrigger's
// own handling + our de-duped refresh. Scroller-relative measurements
// get recalculated whenever ScrollTrigger.refresh fires.
let resizeT = null;
window.addEventListener('resize', () => {
clearTimeout(resizeT);
resizeT = setTimeout(scheduleRefresh, 220);
});
// After fonts load, re-measure (headline wrap can shift positions).
if (document.fonts && document.fonts.ready) {
document.fonts.ready.then(scheduleRefresh);
}
// After all illustrations load, re-measure (treasure-map stops change height).
const bgIllustrations = document.querySelectorAll('#page-overview .stop-illust');
let pendingBg = bgIllustrations.length;
if (pendingBg === 0) scheduleRefresh();
bgIllustrations.forEach((el) => {
// Illustrations are CSS-background images; use an Image() to listen for load
const bg = getComputedStyle(el).backgroundImage;
const url = bg && bg.match(/url\("?([^")]+)"?\)/);
if (!url) { if (--pendingBg === 0) scheduleRefresh(); return; }
const img = new Image();
img.onload = img.onerror = () => { if (--pendingBg === 0) scheduleRefresh(); };
img.src = url[1];
});
// Final refresh after everything wires up
scheduleRefresh();
}
/**
* Smooth-scroll the Overview's internal scroller to a scene.
* Called by the dot-nav click handler in timeline.js.
*
* @param {string} sceneId id of the scene section (e.g. "stack-scene")
* — see sceneOrder[] inside init().
* Special value "hero" scrolls to top (0).
*/
function scrollTo(sceneId) {
if (!scrollerEl) return; // init() hasn't run yet — ignore
const target = document.getElementById(sceneId);
if (!target) return;
// "hero" is the first scene and sits at scrollTop 0. Scrolling to
// the scene element directly works in most cases but produces a tiny
// non-zero offset (padding / border) — hard-code 0 for hero.
const scrollY = sceneId === 'hero' ? 0 : target.offsetTop;
if (lenisInstance && typeof lenisInstance.scrollTo === 'function') {
// Lenis does the smooth animation. `immediate: false` uses the
// same easing as wheel input — feels consistent.
lenisInstance.scrollTo(scrollY, { immediate: false });
} else {
// Fallback for pre-init / reduced-motion: hard-jump.
scrollerEl.scrollTo({ top: scrollY, behavior: 'smooth' });
}
}
// Public surface — timeline.js calls these when the Overview tab
// activates (init) or when a dot-nav button targeting a scene is
// clicked (scrollTo).
window.__bifrost = { init, scrollTo };
})();