// body { cursor: ns-resize }
.intro-section {
  text-align: center;
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.content-section {
  --scroll-length: 1.5;
  height: calc( var(--scroll-length) * 100vh );
  width: 100%;
  font-family: Helvetica Neue, Helvetica, Arial, sans-serif;

  .content .subheading, 
  .content .paragraph {
    opacity: 1; 
    opacity: calc( 1 + var(--viewport-y) );
  }
 
}

.figure {
  width: 100%;
  height: 100vh;
  margin: 0;
  position: absolute;
  top: 0;
  left: 0;

  > img { // 🥕
    display: block;
    width: 100%;
    height: 100%;
    max-width: 100%;
    object-fit: cover;
    object-position: center center;
  }
}

.content {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  max-width: 35em;
  display: grid;
  grid-template-rows: 1fr 1fr;
  color: white;
  padding: 2em;
  font-size: 2.5vmin;

  * {
    text-shadow: 0 0 4vmin rgba(black, 0.25);
  }

  > .header {
    grid-row: 1 / 2;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
  }

  > .paragraph {
    grid-row: 2 / 3;
    line-height: 1.5;
  }
} 

.heading {
  font-size: 2.75em;
  margin: 0;
}

.subheading {
  font-size: 1.25em;
  font-weight: 600;
  margin-bottom: .5em;
}

/* ---------------------------------- */

.figure {
  --scale: calc(.8 + 
    (.2 * var(--scroll-length) * var(--visible-y))
  );
  position: sticky;
  top: 0;
  left: 0;
  margin: 0;
  display: block; 
  overflow: hidden;
  will-change: transform;
  transform: scale(var(--scale));

  &:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    background-color: rgba(black, 1);
    opacity: calc( var(--visible-y) );
  }

  > img {
    display: block;
    will-change: transform;
    transform: scale(calc(1 / var(--scale)));
  }
}

/* ---------------------------------- */

.char {
  display: inline-block;
  opacity: calc( 
    1 + ( 
      ( var(--viewport-y) * 1.5 )
      - var(--char-percent)
    )
  );
}


*,
*:before,
*:after {
  position: relative;
  box-sizing: border-box;
}

.heading,
.intro-heading {
  font-weight: 700;
}

body, html {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
  line-height: 1.05;
  font-weight: 400;
  letter-spacing: -.015em;
  font-family: "SF Pro Display","Helvetica Neue","Helvetica","Arial",sans-serif;
}