:root {
  --scroll: 0;
  --model: 0;
}

* {
  box-sizing: border-box;
}

html {
  background: #050505;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow-x: hidden;
  background: #050505;
  color: white;

  font-family:
    "Inter",
    "Helvetica Neue",
    Arial,
    sans-serif;
}

/* =========================================================
   HERO SCROLL AREA
========================================================= */

.hero-scroll {
  position: relative;
  height: 360vh;
  background: #050505;
}

.scene {
  position: sticky;
  top: 0;

  width: 100%;
  height: 100vh;

  overflow: hidden;
  background: #050505;
}

/* =========================================================
   OPENING IMAGE
========================================================= */

.background {
  position: absolute;
  inset: -5%;

  background:
    linear-gradient(
      rgba(0, 0, 0, calc(.72 - var(--scroll) * .35)),
      rgba(0, 0, 0, calc(.82 - var(--scroll) * .35))
    ),
    url("main.png") center 48% / cover no-repeat;

  opacity: clamp(
    0,
    calc(var(--scroll) * 1.15 - var(--model) * 1.30),
    1
  );

  transform:
    scale(calc(1.08 - var(--scroll) * .055))
    translateY(calc(var(--scroll) * -1.5vh));

  filter:
    grayscale(.2)
    contrast(1.1)
    brightness(.75);

  will-change:
    opacity,
    transform;
}

.vignette {
  position: absolute;
  inset: 0;

  z-index: 1;

  background:
    radial-gradient(
      ellipse at center,
      transparent 24%,
      rgba(0, 0, 0, .20) 58%,
      rgba(0, 0, 0, .82) 100%
    );

  pointer-events: none;
}

/* =========================================================
   HESITATION TYPE
========================================================= */

.word-wrap {
  position: absolute;
  inset: 0;

  z-index: 2;

  display: grid;
  place-items: center;

  padding: 2rem;

  opacity: calc(1 - var(--model));

  pointer-events: none;
}

.word {
  margin: 0;

  padding-left:
    calc(.02em + var(--scroll) * .5em);

  font-size:
    clamp(2.7rem, 8.2vw, 9rem);

  font-weight: 100;
  line-height: 1;

  text-transform: uppercase;
  white-space: nowrap;

  letter-spacing:
    calc(0em + var(--scroll) * .52em);

  color:
    rgba(
      255,
      255,
      255,
      calc(.98 - var(--scroll) * .12)
    );

  text-shadow:
    0 1px 18px rgba(0, 0, 0, .18);

  will-change:
    letter-spacing,
    color;
}

/* =========================================================
   THREE.JS MODEL STAGE
========================================================= */

.model-stage {
  position: absolute;
  inset: 0;

  z-index: 5;

  opacity: var(--model);
  pointer-events: none;

  background:
    rgba(
      3,
      4,
      5,
      calc(var(--model) * .96)
    );

  will-change: opacity;
}

.model-stage.interactive {
  pointer-events: auto;
}

#three-canvas {
  display: block;

  width: 100%;
  height: 100%;

  opacity: var(--model);

  transform:
    scale(calc(.94 + var(--model) * .06))
    translateY(calc((1 - var(--model)) * 18px));

  transform-origin: center;

  outline: none;

  /*
    Vertical swipes remain usable for page scrolling.
    Horizontal mouse/touch movement still rotates the model.
  */
  touch-action: pan-y;
}

.model-halo {
  position: absolute;

  left: 42%;
  top: 35%;

  width: min(55vw, 800px);
  height: min(45vw, 600px);

  transform: translate(-50%, -50%);

  background:
    radial-gradient(
      ellipse,
      rgba(255,255,255,.035) 0%,
      rgba(255,255,255,.012) 35%,
      transparent 70%
    );

  filter: blur(35px);

  opacity: var(--model);

  pointer-events: none;
}

.loading {
  position: absolute;

  left: 50%;
  top: 50%;

  transform: translate(-50%, -50%);

  font-size: 10px;
  font-weight: 200;

  letter-spacing: .30em;
  text-transform: uppercase;

  opacity: calc(var(--model) * .65);

  pointer-events: none;

  transition: opacity .35s ease;
}

.loading.hidden {
  opacity: 0;
}

.model-ui {
  position: absolute;

  left: 42px;
  bottom: 34px;

  z-index: 7;

  display: flex;
  align-items: center;
  gap: 14px;

  font-size: 9px;
  font-weight: 300;

  letter-spacing: .24em;
  text-transform: uppercase;

  opacity: calc(var(--model) * .62);

  pointer-events: none;
}

.model-ui-line {
  display: block;

  width: 34px;
  height: 1px;

  background: currentColor;
  opacity: .65;
}

/* =========================================================
   SCROLL HINT / GRAIN
========================================================= */

.hint {
  position: absolute;

  bottom: 34px;
  left: 50%;

  transform: translateX(-50%);

  z-index: 7;

  font-size: 10px;
  font-weight: 200;

  letter-spacing: .28em;
  text-transform: uppercase;

  opacity:
    calc(.45 - var(--scroll) * .8);

  white-space: nowrap;
  pointer-events: none;
}

.line {
  display: inline-block;

  width: 34px;
  height: 1px;

  margin-right: 14px;

  vertical-align: middle;

  background: currentColor;

  opacity: .7;
}

.grain {
  position: absolute;
  inset: 0;

  z-index: 6;

  opacity: .045;
  pointer-events: none;

  background-image:
    url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.85'/%3E%3C/svg%3E");

  mix-blend-mode: soft-light;
}

/* =========================================================
   PROJECT SUMMARY
========================================================= */

.project-summary {
  position: relative;
  z-index: 10;

  min-height: 100vh;

  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(420px, .85fr);

  background: #f1f0ec;
  color: #111;
}

.summary-image-wrap {
  min-height: 100vh;
  overflow: hidden;
  background: #111;
}

.summary-image {
  display: block;

  width: 100%;
  height: 100%;

  object-fit: cover;

  filter:
    saturate(.82)
    contrast(1.04);
}

.summary-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;

  padding:
    clamp(56px, 8vw, 128px)
    clamp(42px, 6vw, 96px);
}

.eyebrow {
  margin-bottom: 32px;

  font-size: 10px;
  font-weight: 400;

  letter-spacing: .28em;
  text-transform: uppercase;
}

.summary-copy h2 {
  margin:
    0
    0
    38px;

  font-size:
    clamp(3.2rem, 6.2vw, 7rem);

  font-weight: 200;

  line-height: .92;

  letter-spacing: -.055em;
}

.summary-lead {
  max-width: 650px;

  margin: 0;

  font-size:
    clamp(1.15rem, 1.7vw, 1.65rem);

  font-weight: 300;
  line-height: 1.48;

  letter-spacing: -.018em;
}

.summary-rule {
  width: 100%;
  height: 1px;

  margin:
    clamp(42px, 5vw, 72px)
    0;

  background:
    rgba(0,0,0,.18);
}

.summary-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.summary-item {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 28px;
}

.summary-item span {
  padding-top: 3px;

  font-size: 9px;
  font-weight: 400;

  letter-spacing: .18em;
}

.summary-item p {
  margin: 0;

  max-width: 500px;

  font-size: 14px;
  font-weight: 300;
  line-height: 1.65;

  color: rgba(0,0,0,.68);
}

.summary-link {
  align-self: flex-start;

  display: inline-flex;
  align-items: center;
  gap: 18px;

  margin-top:
    clamp(48px, 6vw, 84px);

  padding-bottom: 8px;

  border-bottom:
    1px solid rgba(0,0,0,.35);

  color: inherit;
  text-decoration: none;

  font-size: 10px;
  font-weight: 400;

  letter-spacing: .22em;
  text-transform: uppercase;
}

.summary-link span {
  font-size: 15px;
  font-weight: 300;
}

/* =========================================================
   MOBILE
========================================================= */

@media (max-width: 850px) {

  .hero-scroll {
    height: 320vh;
  }

  .project-summary {
    display: block;
  }

  .summary-image-wrap {
    min-height: 62vh;
    height: 62vh;
  }

  .summary-copy {
    min-height: auto;
    padding: 60px 28px 84px;
  }

  .summary-item {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .model-ui {
    left: 22px;
    bottom: 24px;
  }

  .word {
    font-size:
      clamp(2.15rem, 11vw, 5rem);

    letter-spacing:
      calc(-.02em + var(--scroll) * .25em);

    padding-left:
      calc(var(--scroll) * .25em);
  }

  .model-halo {
    width: 110vw;
    height: 80vw;
  }
}

@media (prefers-reduced-motion: reduce) {

  .background {
    transform: none;
  }

  .word {
    letter-spacing: .18em;
  }

  #three-canvas {
    transform: none;
  }
}