/* ---------------------------------------------------------------------------
   About — one scroll, eight chapters.

   On a desktop the page is a single fixed stage. Every chapter is a layer on
   it, and js/about.js drives each layer from the scroll position: the page
   itself is only a tall spacer that gives the scrollbar something to measure.

   Type is set in rem, and on the stage the root size is tied to the viewport
   width (0.9375vw, so 1rem = 13.5px on a 1440px screen). The whole composition
   scales as one piece with the window, which is what lets the motion — also in
   rem, vw and vh — land in the same place on every desktop size.

   Phones, small windows and reduced motion get .ab-read instead: the same words
   as a plain column. Screen readers get .ab-read everywhere.
--------------------------------------------------------------------------- */

/* The home page is one fixed viewport; this page scrolls. */
.about-page,
.about-page body {
  height: auto;
  min-height: 100%;
  overflow-x: hidden;
  overflow-y: auto;
}

.about-body {
  --ink: #ffffff;
  --off: #969da0;
  --dim-20: rgba(151, 158, 161, 0.2);
  --dim-40: rgba(151, 158, 161, 0.4);
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  background: #000;
  color: var(--ink);
  overscroll-behavior: auto;
}

/* style.css holds the chrome back until the home grid reveals itself. There is
   no reveal here. */
.about-body .app-header,
.about-body .app-menu { opacity: 1; }

.about-body .app-menu .link.is-current { color: rgba(255, 255, 255, 0.95); }

/* --- stage -------------------------------------------------------------- */

.ab-stage,
.ab-rail,
.ab-spacer { display: none; }

html.ab-scroll { font-size: 0.9375vw; }

html.ab-scroll .ab-stage {
  display: block;
  position: fixed;
  inset: 0;
  z-index: 5;
  overflow: hidden;
  pointer-events: none;
  text-transform: uppercase;
  color: var(--ink);
  animation: ab-in 1.4s var(--ease) both;
}

@keyframes ab-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* 20 screens tall, so the story runs over 19 screens of scrolling. */
html.ab-scroll .ab-spacer {
  display: block;
  height: 2000vh;
}

/* Layers are composited and kept off the main thread where possible; the
   engine hides any layer that is fully transparent. */
.ab-stage [data-m] { will-change: transform, opacity; }

.ab-fixed {
  position: fixed;
  inset: 0;
}

.ab-center {
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.ab-full { width: 100%; }

.ab-ch,
.ab-sp { display: inline-block; }
.ab-sp { white-space: pre; }

.ab-stage video,
.ab-stage img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* --- 1. opening --------------------------------------------------------- */

.ab-hero__half {
  position: absolute;
  top: 0;
  left: 0;
  width: 50%;
  height: 100%;
}

.ab-hero__full {
  position: absolute;
  inset: 0;
  background: #000;
  transform-origin: 50% 50%;
}

.ab-hero__inner {
  position: absolute;
  inset: 0;
}

/* The footage is colour; the opening is set in black and white, the way the
   grid on the home page rests until a tile is hovered. */
.ab-hero video { filter: grayscale(1) brightness(0.6) contrast(1.08); }

.ab-t__h {
  margin: 0;
  font-weight: 400;
  text-align: center;
}

.ab-t__line {
  display: block;
  position: relative;
  margin-top: 1rem;
  line-height: 1.1;
}

.ab-big {
  margin: 0 0.5rem;
  font-size: 2.333rem;
  letter-spacing: 0.35em;
  color: var(--ink);
}

.ab-small {
  margin: 0 0.5rem;
  font-size: 1.111rem;
  letter-spacing: 0.35em;
  color: var(--off);
}

/* "is a" hangs off the end of the name rather than taking part in centring. */
.ab-small--after {
  position: absolute;
  bottom: 0.15em;
}

.ab-wellas {
  display: inline-block;
  margin: 0 0.5rem;
  font-size: 1.111rem;
  letter-spacing: 3em;
  color: var(--off);
}

/* --- word staircases (2 and 7) ------------------------------------------ */

.ab-magic {
  display: flex;
  margin: 0;
  padding: 16rem 8rem;
  font-weight: 400;
  font-size: 1rem;
  letter-spacing: 0.222em;
  line-height: 1.25;
  white-space: nowrap;
  color: var(--ink);
  -webkit-mask-image: linear-gradient(to left, rgba(0, 0, 0, 0) 100%, #000 100%);
  mask-image: linear-gradient(to left, rgba(0, 0, 0, 0) 100%, #000 100%);
}

.ab-magic--small {
  font-size: 0.777rem;
  letter-spacing: 0.35em;
  line-height: 1.85;
}

.ab-magic__w {
  display: inline-block;
  position: relative;
}

/* The last word of a staircase: a faint copy underneath, and the letters on
   top that break away on exit. */
.ab-fillword {
  display: inline-flex;
  position: relative;
}

.ab-hollow {
  position: absolute;
  top: 0;
  left: 0;
  white-space: nowrap;
  color: var(--dim-20);
}

.ab-fl {
  display: inline-block;
  position: relative;
}

/* --- paragraphs (3 and 5) ----------------------------------------------- */

.ab-m2 {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100vw;
}

.ab-m2__col {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0 16rem;
  font-size: 1.111rem;
  letter-spacing: 0.35em;
  line-height: 1.375;
  color: var(--off);
}

.ab-m2__line { white-space: nowrap; }
.ab-m2__line--gap { margin-bottom: 1rem; }
.ab-m2__span { display: inline-block; }

.ab-m2__rel {
  position: relative;
  display: flex;
}

.ab-m2__ghost {
  position: absolute;
  top: 0;
  left: 0;
  display: flex;
  color: var(--dim-40);
}

.ab-m2__pics {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.ab-m2__big { width: 30vw; }
.ab-m2__big img { aspect-ratio: 432 / 447; height: auto; }

.ab-m2__small {
  position: absolute;
  right: 100%;
  bottom: 0;
  width: 16vw;
  margin-right: -2.5rem;
  margin-bottom: 3.5rem;
}

.ab-m2__small img { aspect-ratio: 230 / 219; height: auto; }

/* --- 4. the drifting sentence ------------------------------------------- */

.ab-swirl {
  position: fixed;
  top: 100%;
  left: 80%;
  width: 7rem;
}

.ab-swirl__b,
.ab-swirl__d {
  position: absolute;
  left: 0;
  font-size: 0.777rem;
  letter-spacing: 0.35em;
  white-space: nowrap;
}

.ab-swirl__b { line-height: 1.111rem; color: var(--ink); }
.ab-swirl__d { line-height: 1.4375rem; color: var(--dim-20); }

/* --- 5. a camera and a city --------------------------------------------- */

.ab-vt__bg {
  position: absolute;
  inset: 0;
}

/* A daylight street frame under white type: held down to the weight of the
   footage it stands in for. */
.ab-vt__bg img { filter: brightness(0.55) saturate(1.05); }

.ab-vt__pos {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 100%;
  transform: translate(-50%, -50%);
}

.ab-vt__h {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0;
  font-weight: 400;
}

.ab-vt__big {
  position: relative;
  display: flex;
  font-size: 4.666rem;
  letter-spacing: 0.35em;
  line-height: 1;
}

.ab-vt__big .ab-hollow { display: flex; color: rgba(255, 255, 255, 0.2); }

.ab-vt__and {
  display: inline-block;
  margin: 2rem 0;
  font-size: 1.666rem;
  letter-spacing: 0.133em;
  line-height: 1.25;
}

.ab-vt__and .ab-ch { margin: 0 1.5rem; }
.ab-vt__and .ab-ch--drop { position: relative; top: 1.5rem; }

.ab-vt__cap {
  width: 24em;
  margin: 6rem auto 0;
  font-size: 0.888rem;
  letter-spacing: 0.25em;
  line-height: 1.25;
  text-align: center;
}

/* --- 6. clients --------------------------------------------------------- */

.ab-co {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
}

.ab-co__cam { transform-origin: 0 0; }

.ab-co__wrap {
  display: flex;
  flex-direction: column;
  width: 100vw;
  padding: 5vw 0;
  transform-origin: 0 100%;
}

.ab-co__intro {
  position: relative;
  top: 5vw;
  margin: 0 0 0.25rem;
  padding: 0 6rem;
  letter-spacing: 0.35em;
  line-height: 1.25;
}

.ab-co__list {
  padding: 5vw 6rem;
}

.ab-co__item {
  position: relative;
  font-size: 1.111rem;
  letter-spacing: 0.35em;
  line-height: 1.25;
}

.ab-co__cap {
  display: flex;
  margin-top: 0.25rem;
  padding: 0 6rem;
  font-size: 0.444rem;
  letter-spacing: 0.5em;
  line-height: 1.25;
}

.ab-co__cap .ab-magic__w { position: relative; }

.ab-sl {
  position: fixed;
  left: 50%;
  top: 50%;
  width: 30vw;
  transform: translate(-50%, -50%);
}

.ab-sl__box {
  position: relative;
  display: flex;
  transform-origin: 0 0;
}

.ab-sl__frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.ab-sl__slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transform: scale(1.1);
  transition: opacity 0.9s var(--ease), transform 1.4s var(--ease);
}

.ab-sl__slide.is-on {
  opacity: 1;
  transform: scale(1);
}

.ab-sl__meta {
  position: absolute;
  left: 100%;
  top: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 8rem;
  height: 100%;
  margin-left: 2rem;
  padding: 1.5rem 0;
  font-size: 0.611rem;
  letter-spacing: 0.4em;
  line-height: 2;
  color: var(--off);
  transition: opacity 0.4s var(--ease);
}

.ab-sl__meta.is-swapping { opacity: 0; }
.ab-sl__meta p { margin: 0; }

/* --- 7. brands and campaigns ------------------------------------------- */

.ab-ring__outer {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 100%;
  height: 100vw;
  transform: translate(-50%, -50%) scale(0.45);
}

.ab-ring__wrap {
  position: relative;
  width: 100%;
  height: 100%;
  perspective: 90vw;
  transform-origin: 50% 50%;
}

.ab-ring__tile {
  position: absolute;
  width: 55vw;
  height: 55vw;
  border-radius: 5vw;
  overflow: hidden;
  transform-origin: center;
  background: #0a0a0a;
}

.ab-ring__t {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.ab-ring__h {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0;
  font-weight: 400;
  font-size: 0.777rem;
  letter-spacing: 0.35em;
  line-height: 1.85;
  text-align: center;
  color: var(--off);
}

.ab-ring__h span { max-width: 35em; }
.ab-ring__gap { margin-bottom: 2.5rem; }
.ab-ring__gap3 { margin-bottom: 3rem; }

.ab-ring__big {
  margin: 1rem 0;
  font-size: 4.666rem;
  letter-spacing: 0.025em;
  line-height: 1;
  color: rgba(255, 255, 255, 0.8);
}

.ab-ring__big--last { margin-bottom: 3.5rem; }

/* --- 8. film + stills, the contact sheet ------------------------------- */

.ab-w__c {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.ab-w__img {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.ab-persp { perspective: 1000px; }

.ab-w__pic { width: 10vw; }
.ab-w__pic img { aspect-ratio: 144 / 96; height: auto; }

.ab-w__h {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 0;
  font-weight: 400;
  white-space: nowrap;
}

.ab-w__word {
  position: relative;
  font-size: 3.23rem;
  letter-spacing: 0.0687em;
  line-height: 0.9;
  color: var(--dim-20);
}

.ab-w__word--l { margin-left: 4rem; }
.ab-w__word--r { margin-left: 15vw; margin-right: 2rem; }

.ab-w__over {
  position: absolute;
  top: 0;
  left: 0;
  color: rgba(255, 255, 255, 0.7);
  white-space: nowrap;
}

.ab-g__wrap {
  position: absolute;
  inset: 0;
  perspective: 1000px;
}

.ab-g__tile { position: absolute; }

.ab-g__tile img { position: absolute; inset: 0; }

/* --- 9. follow ---------------------------------------------------------- */

.ab-so {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  color: var(--off);
}

.ab-so__for {
  position: relative;
  margin: 0 0 1.5rem;
  font-size: 0.777rem;
  letter-spacing: 0.35em;
  line-height: 1.85;
  color: var(--dim-20);
}

.ab-so__for .ab-over {
  position: absolute;
  inset: 0;
  display: flex;
  color: var(--off);
}

.ab-so__title {
  margin: 0 0 1.75rem;
  font-weight: 400;
  font-size: 1.333rem;
  letter-spacing: 0.35em;
  line-height: 1.25;
}

.ab-so__small {
  margin: 0;
  font-size: 0.777rem;
  letter-spacing: 0.35em;
  line-height: 1.85;
}

.ab-so__small span { margin: 0 2rem; }

.ab-so__row { margin-top: 1.75rem; }
.ab-so__row--on { margin-bottom: 0.5rem; }

.ab-so__link {
  pointer-events: auto;
  font-size: 1.666rem;
  letter-spacing: 0.35em;
  line-height: 1.25;
  color: var(--off);
  transition: color 0.5s var(--ease);
}

.ab-so__link:hover,
.ab-so__link:focus-visible { color: var(--ink); }

.ab-so__mail {
  pointer-events: auto;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: none;
  color: var(--off);
  transition: color 0.5s var(--ease);
}

.ab-so__mail:hover,
.ab-so__mail:focus-visible { color: var(--ink); }

/* --- chapter rail ------------------------------------------------------- */

html.ab-scroll .ab-rail {
  display: block;
  position: fixed;
  right: 3rem;
  top: 50%;
  z-index: 40;
  transform: translateY(-50%);
  pointer-events: none;
  mix-blend-mode: difference;
}

.ab-rail::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 1px;
  background: rgba(255, 255, 255, 0.25);
}

.ab-rail__item {
  position: relative;
  height: 4rem;
}

.ab-rail__item::after {
  content: "";
  position: absolute;
  left: -3px;
  top: 50%;
  width: 7px;
  height: 1px;
  background: rgba(255, 255, 255, 0.45);
}

.ab-rail__label {
  position: absolute;
  right: 1.6rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.5rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  white-space: nowrap;
  color: rgba(255, 255, 255, 0.6);
  opacity: 0;
  transition: opacity 0.6s var(--ease);
}

.ab-rail__item.is-current .ab-rail__label { opacity: 1; }

.ab-rail__box {
  position: absolute;
  left: -0.75rem;
  top: 0;
  width: 1.5rem;
  height: 4rem;
  border: 1px solid rgba(255, 255, 255, 0.6);
  transition: transform 0.6s var(--ease);
}

/* --- the reading version ------------------------------------------------ */

.ab-read {
  position: relative;
  z-index: 5;
  max-width: 34rem;
  margin: 0 auto;
  padding: 9.5rem var(--pad-x) 9rem;
  text-transform: uppercase;
  text-align: center;
  color: var(--off);
}

html.ab-scroll .ab-read {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.ab-read__sec {
  padding: 3.5rem 0;
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 1s var(--ease), transform 1.2s var(--ease);
}

.ab-read__sec.is-in {
  opacity: 1;
  transform: none;
}

.ab-read__big {
  display: block;
  margin: 0.4em 0;
  font-size: clamp(20px, 6vw, 30px);
  letter-spacing: 0.3em;
  line-height: 1.3;
  color: var(--ink);
}

.ab-read__small {
  display: block;
  font-size: 11px;
  letter-spacing: 0.35em;
  line-height: 2;
}

.ab-read__p {
  margin: 0 auto;
  max-width: 22em;
  font-size: 12px;
  letter-spacing: 0.3em;
  line-height: 2.1;
}

.ab-read__p + .ab-read__p { margin-top: 1.4em; }

.ab-read__fig {
  margin: 2.2rem auto 0;
  max-width: 22rem;
}

.ab-read__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.ab-read__list {
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
  font-size: 15px;
  letter-spacing: 0.3em;
  line-height: 2;
  color: var(--ink);
}

.ab-read__links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
  margin-top: 1.6rem;
}

.ab-read__links a {
  font-size: 18px;
  letter-spacing: 0.35em;
  color: var(--ink);
}

.ab-read__links .ab-read__mail {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: none;
  color: var(--off);
}

@media (prefers-reduced-motion: reduce) {
  .ab-read__sec { opacity: 1; transform: none; transition: none; }
}