:root {
  --black: #0b0d0c;
  --grey: #b9bdb8;
  --paper: #e5e6df;
  --orange: #f15a24;
  --explode: 0;
  --crown-progress: 0;
  --chamber-progress: 0;
  --vent-progress: 0;
  --base-progress: 0;
  --callout-progress: 0;
  --callout-offset: 140;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--black); }
body {
  margin: 0;
  overflow-x: hidden;
  color: var(--paper);
  background: var(--black);
  font-family: Arial, "Helvetica Neue", sans-serif;
}
a { color: inherit; }
img { display: block; width: 100%; height: 100%; object-fit: cover; }
.skip-link {
  position: fixed;
  z-index: 100;
  top: -5rem;
  left: 1rem;
  padding: 1rem;
  color: var(--black);
  background: var(--paper);
}
.skip-link:focus { top: 1rem; }
.site-header {
  position: absolute;
  z-index: 10;
  inset: 0 0 auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  padding: 1rem 1.3rem;
  border-bottom: 1px solid rgba(255, 255, 255, .28);
  font-size: .62rem;
  font-weight: 700;
  letter-spacing: .13em;
}
.site-header a { text-decoration: none; }
.site-header span { text-align: center; }
.site-header a:last-child { text-align: right; }

.hero { position: relative; height: 100svh; min-height: 42rem; }
.hero-shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(5, 8, 7, .82) 0, rgba(5, 8, 7, .18) 60%, rgba(5, 8, 7, .22)),
    linear-gradient(0deg, rgba(0, 0, 0, .55), transparent 45%);
}
.hero-copy { position: absolute; left: 4vw; top: 25vh; }
.hero-copy p,
.material-copy > p,
.purchase-demo__headline > p,
.static-parts > p,
.assembly-copy > p { font-size: .62rem; font-weight: 700; letter-spacing: .2em; }
.hero-copy h1 {
  margin: 1.2rem 0 3.5rem;
  font-size: clamp(4.3rem, 9vw, 10rem);
  line-height: .78;
  letter-spacing: -.08em;
  text-transform: uppercase;
}
.hero-copy h1 span { color: transparent; -webkit-text-stroke: 1px var(--paper); }
.hero-copy a { font-size: .68rem; font-weight: 700; letter-spacing: .12em; text-decoration: none; }
.hero-spec {
  position: absolute;
  right: 1.3rem;
  bottom: 1.2rem;
  display: flex;
  gap: 2rem;
  font-size: .62rem;
  letter-spacing: .1em;
}

.assembly { height: 300vh; background: #111412; }
.assembly-stage {
  position: sticky;
  top: 0;
  height: 100svh;
  overflow: hidden;
  background:
    radial-gradient(circle at 71% 47%, rgba(78, 85, 80, .42), transparent 28%),
    radial-gradient(circle at 69% 49%, #2b302c 0, #151816 44%, #0b0d0c 72%);
}
.assembly-stage::before {
  content: "UNIT / 01";
  position: absolute;
  left: 4vw;
  bottom: 4vh;
  color: #202420;
  font-size: 13vw;
  font-weight: 900;
  letter-spacing: -.1em;
  white-space: nowrap;
}
.assembly-copy { position: absolute; z-index: 5; left: 4vw; top: 10vh; }
.assembly-copy h2 {
  margin: 1rem 0;
  font-size: clamp(4rem, 8vw, 9rem);
  line-height: .8;
  letter-spacing: -.08em;
  text-transform: uppercase;
}
.assembly-copy > span {
  display: inline-block;
  margin-top: 1.5rem;
  padding: .55rem .8rem;
  color: var(--black);
  background: var(--orange);
  font-size: .62rem;
  font-weight: 900;
  letter-spacing: .13em;
}
.product {
  position: absolute;
  left: 68%;
  top: 52%;
  width: min(46vw, 43rem);
  height: min(92svh, 49rem);
  transform: translate(-50%, -50%);
}
.product-blueprint { width: 100%; height: 100%; overflow: visible; }
.product-part {
  transform-box: fill-box;
  transform-origin: center;
  will-change: transform;
}
.product-part.crown {
  transform: translateY(calc(var(--crown-progress) * -96px)) rotate(calc(var(--crown-progress) * -1.4deg));
}
.product-part.chamber {
  transform: translateY(calc(var(--chamber-progress) * -36px)) rotate(calc(var(--chamber-progress) * .7deg));
}
.product-part.vent {
  transform: translateY(calc(var(--vent-progress) * 54px)) rotate(calc(var(--vent-progress) * -.8deg));
}
.product-part.base {
  transform: translateY(calc(var(--base-progress) * 126px)) rotate(calc(var(--base-progress) * 1.2deg));
}
.part-callout {
  opacity: var(--callout-progress);
  color: var(--paper);
}
.part-callout path {
  fill: none;
  stroke: rgba(229, 230, 223, .56);
  stroke-width: 1.5;
  stroke-dasharray: 140;
  stroke-dashoffset: var(--callout-offset);
}
.part-callout text {
  fill: var(--paper);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.2px;
}
.part-callout text:first-of-type { fill: var(--orange); font-size: 12px; }
.scroll-meter {
  position: absolute;
  right: 1.3rem;
  top: 12vh;
  width: 2px;
  height: 76vh;
  background: #373b38;
}
.scroll-meter span { display: block; width: 100%; height: calc(var(--explode) * 100%); background: var(--orange); }

.static-parts { display: none; padding: 7rem 1rem; background: #171a18; }
.static-parts h2 { font-size: clamp(3rem, 11vw, 5rem); line-height: .9; letter-spacing: -.07em; }
.static-parts ol { padding: 0; border-top: 1px solid #454a46; list-style: none; }
.static-parts li {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: .5rem;
  padding: 1.2rem 0;
  border-bottom: 1px solid #454a46;
}
.static-parts b { color: var(--orange); }
.static-parts small { grid-column: 2; color: #929792; }

.material {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  min-height: 110svh;
  color: var(--black);
  background: var(--paper);
}
.material figure { min-height: 110svh; margin: 0; overflow: hidden; }
.material figure img { transform: scale(1.025); }
.material > div {
  display: flex;
  align-items: center;
  padding: clamp(8rem, 14vh, 12rem) clamp(3rem, 7vw, 8rem);
}
.material-copy { width: 100%; max-width: 32rem; }
.material h2 {
  margin: 2.5rem 0 3rem;
  font-size: clamp(3.6rem, 5.4vw, 6.4rem);
  line-height: .92;
  letter-spacing: -.07em;
}
.material-copy > p:not(:first-child) { max-width: 30rem; font-size: .9rem; line-height: 2; }
.material dl { margin-top: clamp(4rem, 8vh, 6rem); border-top: 1px solid; }
.material dl div { display: grid; grid-template-columns: 1fr 1fr; padding: 1rem 0; border-bottom: 1px solid; }
.material dt { font-size: .6rem; letter-spacing: .12em; }
.material dd { margin: 0; text-align: right; }

.purchase-demo {
  display: grid;
  align-content: center;
  justify-items: center;
  min-height: max(100svh, 54rem);
  padding: clamp(7rem, 12vh, 10rem) max(1.5rem, 5vw);
  gap: clamp(3rem, 6vh, 5.5rem);
  color: var(--black);
  background: var(--orange);
  text-align: center;
}
.purchase-demo__headline,
.purchase-demo__offer,
.purchase-demo__meta { display: grid; justify-items: center; }
.purchase-demo__headline { gap: clamp(1.5rem, 3vh, 2.5rem); }
.purchase-demo__headline > p { margin: 0; }
.purchase-demo h2 {
  margin: 0;
  font-size: clamp(2.5rem, 8.5vw, 8.5rem);
  line-height: .88;
  letter-spacing: -.08em;
}
.purchase-demo h2 span { display: block; white-space: nowrap; }
.purchase-demo h2 span:first-child { font-size: 1.45em; }
.purchase-demo__offer { gap: 1.75rem; }
.purchase-demo strong { font-size: 2rem; line-height: 1.15; }
.purchase-demo strong small { display: block; font-size: .6rem; font-weight: 400; }
.purchase-demo button {
  padding: 1.1rem 3rem;
  border: 1px solid var(--black);
  background: transparent;
  font-weight: 700;
  cursor: pointer;
}
.purchase-demo__meta { gap: 1.5rem; }
.purchase-demo .demo-note { max-width: 30rem; margin: 0; font-size: .65rem; line-height: 1.8; }
.purchase-demo .demo-note span { display: block; }
.purchase-demo__meta > a { font-size: .65rem; font-weight: 700; letter-spacing: .12em; }
footer { display: flex; justify-content: space-between; padding: 1rem 1.3rem; font-size: .58rem; letter-spacing: .12em; }

@media (max-height: 760px) and (min-width: 801px) {
  .purchase-demo {
    min-height: 100svh;
    padding: 4rem max(1.5rem, 5vw);
    gap: 2.5rem;
  }
  .purchase-demo__headline { gap: 1rem; }
  .purchase-demo h2 { font-size: clamp(2.5rem, 7.5vw, 7.5rem); }
  .purchase-demo__offer { gap: 1.25rem; }
  .purchase-demo__meta { gap: 1rem; }
}

@media (max-width: 800px) {
  .site-header { grid-template-columns: 1fr auto; }
  .site-header span { display: none; }
  .hero-copy { left: 1rem; right: 1rem; top: auto; bottom: 6rem; }
  .hero-copy h1 { font-size: clamp(4rem, 19vw, 7rem); }
  .hero-spec { left: 1rem; right: 1rem; justify-content: space-between; gap: .5rem; }
  .assembly { height: auto; }
  .assembly-stage { position: relative; height: 48rem; }
  .assembly-copy { left: 1rem; top: 4rem; }
  .assembly-copy h2 { font-size: 4rem; }
  .product { left: 50%; top: 62%; width: 27rem; height: 32rem; }
  .product-part { transform: none !important; }
  .part-callout { display: none; }
  .scroll-meter { display: none; }
  .static-parts { display: block; }
  .material { grid-template-columns: 1fr; min-height: auto; }
  .material figure { min-height: 64svh; }
  .material > div { padding: 6.5rem 1.5rem 7.5rem; }
  .material-copy { max-width: 34rem; }
  .material h2 { font-size: clamp(3.2rem, 14vw, 4.8rem); line-height: .96; }
  .purchase-demo {
    min-height: max(100svh, 48rem);
    padding: 6rem 1.5rem;
    gap: 3.25rem;
  }
  .purchase-demo__headline { gap: 1.5rem; }
  .purchase-demo h2 { font-size: clamp(2.45rem, 10.5vw, 3.2rem); line-height: .92; }
  .purchase-demo__offer { gap: 1.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; scroll-behavior: auto !important; transition: none !important; }
  .assembly {
    height: auto;
    --explode: 0;
    --crown-progress: 0;
    --chamber-progress: 0;
    --vent-progress: 0;
    --base-progress: 0;
    --callout-progress: 1;
    --callout-offset: 0;
  }
  .assembly-stage { position: relative; height: min(52rem, 100svh); }
  .scroll-meter { display: none; }
  .static-parts { display: block; }
}

.purchase-demo__meta > a + a { opacity: .72; }