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HTML 

              
                <nav
  class="u-nav u-nav--idle"
     
  data-nav="parent"
  data-nav-fixed="false"
>
  <div class="group u-nav__wrapper">
    <div class="u-nav__main">
      <a href="#" class="m-logo">
        <span class="m-logo__chunk m-logo__chunk--1">Ellis</span><span class="m-logo__space"> </span><span class="m-logo__chunk m-logo__chunk--2">Brigham</span>
      </a>
      <ul class="u-nav__list">
        <li class="u-nav__item" data-nav-expand="snowsports">
          <a href="#">Snowsports</a>
        </li>
        <li class="u-nav__item" data-nav-expand="outdoors">
          <a href="#">Outdoors</a>
        </li>
        <li class="u-nav__item" data-nav-expand="stores">
          <a href="#">Stores</a>
        </li>
      </ul>
      <a class="m-btn m-btn--accent" href="#">
        <span class="m-btn__pre">Shop the</span>
        Winter Sale
      </a>
    </div>
  </div>
  
  <div class="u-nav__expand" data-nav-expandable>
    <div class="group">
      <div class="u-nav__expand-item" data-nav-expand-item="snowsports">
        <ul class="u-nav__list">
          <span class="u-nav__subtitle">Clothing</span>
          <li class="u-nav__item">
            <a href="#">Jackets</a>
          </li>
          <li class="u-nav__item">
            <a href="#">Sallopettes</a>
          </li>
          <li class="u-nav__item">
            <a href="#">Midlayers</a>
          </li>
          <li class="u-nav__item">
            <a href="#">Gloves</a>
          </li>
          <li class="u-nav__item">
            <a href="#">Socks</a>
          </li>
        </ul>
        <ul class="u-nav__list">
          <span class="u-nav__subtitle">Equipment</span>
          <li class="u-nav__item">
            <a href="#">Skis</a>
          </li>
          <li class="u-nav__item">
            <a href="#">Poles</a>
          </li>
          <li class="u-nav__item">
            <a href="#">Snowboards</a>
          </li>
          <li class="u-nav__item">
            <a href="#">Boots</a>
          </li>
          <li class="u-nav__item">
            <a href="#">Helmets</a>
          </li>
          <li class="u-nav__item">
            <a href="#">Goggles</a>
          </li>
          <li class="u-nav__item">
            <a href="#">Accessories</a>
          </li>
        </ul>
      </div>
      <div class="u-nav__expand-item" data-nav-expand-item="outdoors">
        Lorem ipsum
      </div>
      <div class="u-nav__expand-item" data-nav-expand-item="stores">
        Lorem ipsum
      </div>
    </div>
  </div>
  
  <b class="u-nav__underlay"></b>
  <b class="u-nav__bg"></b>
</nav>
<b class="u-nav__shim"></b>

<div class="u-hero">
  <b class="u-hero__bg" data-hero-bg></b>
  <b class="u-hero__fg" data-hero-fg></b>
  <div class="group">
    <h1 class="h1">Winter Sale</h1>
    <p class="p">The <span class="m-logo"><span class="m-logo__chunk m-logo__chunk--1">Ellis</span><span class="m-logo__space"> </span><span class="m-logo__chunk m-logo__chunk--2">Brigham</span></span> Winter Sale is now live. Grab yourself a bargain before you head out to the slopes this season.</p>
    <a href="#" class="m-btn m-btn--l">Women’s</a>
    <a href="#" class="m-btn m-btn--l">Men’s</a>
  </div>
</div>

<div class="u-content">
  <div class="group">

  </div>
</div>
!

CSS 

              
                $c-brand: #F35203;
$c-dark: #131200;
$c-light: #FFFFFC;
$c-mid: mix($c-dark, $c-light, 5%);
$c-accent: #FF1B1C;

$timing: 250ms;
$easing: ease-out;

html {
  box-sizing: border-box;
}

* {
  box-sizing: inherit;
  
  &::before,
  &::after {
    box-sizing: inherit;
  }
}

body {
  font-family: Helvetica Neue,Helvetica,Arial,sans-serif; 
}

.group {
  margin: 0 auto;
  max-width: 80rem;
  width: 92%;
}

// Typography
.h1 {
  font-size: 9rem;
  font-weight: 300;
}

.p {
  line-height: 1.5;
  font-weight: 400;
}

// Logo
.m-logo {
  color: currentColor;
  font-size: 2rem;
  text-decoration: none;
  
  &__space {
    display: none;
  }
  
  &__chunk {
    text-transform: lowercase;
    
    &--1 {
      font-weight: 300;
    }
    
    &--2 {
      color: $c-brand;
      font-weight: 900;
    }
  }
}

// Button
.m-btn {
  --btn-padding: 0.6rem;
  
  background: var(--btn-bg, #{$c-brand});
  color: var(--btn-color, #{$c-light});
  display: table;
  font-size: 1.1rem;
  margin: 0.25rem 0 0.5rem;
  padding: calc(var(--btn-padding) * 0.66) calc(var(--btn-padding) + 1.5rem) calc(var(--btn-padding) * 0.66) calc(var(--btn-padding));
  border-radius: 0.25em;
  text-decoration: none;
  text-transform: uppercase;
  font-weight: 500;
  position: relative;
  letter-spacing: 0.033em;
  transition: $timing $easing;
  transition-property: background-color, border-color, color;
  // text-align: center;
  
  &--s {
    --btn-padding: 0.8rem;
    
    font-size: 1rem;
  }
  
  &--m {
    --btn-padding: 1rem;

    font-size: 1.1rem;
  }
  
  &--l {
    --btn-padding: 1.2rem;
    
    font-size: 1.25rem;
  }
  
  &::before {
    content: '→';
    font-family: monospace;
    font-weight: 600;
    position: absolute;
    right: 0;
    font-size: 1.75rem;
    transform: translate(-5%, -55%);
    transition: transform $timing $easing;
    top: 50%;
    width: 2rem;
    text-align: center;
  }
  
  &::after {
    border: 2px solid var(--btn-border);
    transition: border-color $timing $easing;
    border-radius: inherit;
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
  }
  
  &:hover {
    background: var(--btn-bg-hover, #{$c-dark});
    color: var(--btn-color-hover, #{$c-light});
    
    &::before {
      transform: translate(5%, -55%);
    }
    
    &::after {
      border-color: var(--btn-border-hover, #{$c-dark});
    }
  }
  
  &__pre {
    display: block;
    font-size: 0.66em;
    opacity: 0.75;
    font-weight: 400;
    margin: -0.05em 0 0.1em;
    text-transform: none;
    transition: opacity $timing $easing;
    letter-spacing: 0;
    
    .m-btn:hover & {
      opacity: 1;
    }
  }
}

// Nav
.u-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 99;
  
  transition: transform $timing $easing;
    
  &[data-nav-fixed="false"],
  &[data-nav-expanded] {
    transform: translate3d(0, 1rem, 0);
  }
  
  &__shim {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 20vw;
    background: linear-gradient(#{$c-light}, transparent);
    z-index: 1;
  }
  
  &__bg {
    position: absolute;
    background: $c-light;
    box-shadow: $c-mid 0 0 0 2px;
    bottom: 0;
    top: calc(var(--expandable-height) * -1 - 1rem);
    left: 0;
    width: 100%;
    transition: $timing $easing;
    transition-property: opacity, transform;
    transform: none;
    
    [data-nav-fixed="false"] & {
      opacity: 0;
    }
    
    [data-nav-expanded] & {
      transform: translateY(var(--expandable-height));
      opacity: 1;
    }
  }
  
  &__wrapper {
    padding: 1rem 0;
    position: relative;
    z-index: 2;
  }
  
  &__main {
    display: flex;
    align-items: center;
    
    .m-btn {
      --btn-padding: 0.6rem;
      
      [data-nav-fixed="false"]:not([data-nav-expanded]) & {
        --btn-bg: transparent;
        --btn-bg-hover: #{$c-dark};
        --btn-border: #{$c-dark};
        --btn-border-hover: #{$c-dark};
        --btn-color: #{$c-dark};
      }
    }
    
    .m-logo {
      
      &__chunk {
        transition: $timing $easing;
        transition-property: color, opacity;
      
        [data-nav-fixed="false"]:not([data-nav-expanded]) & {
          color: black;
          
          &--1 {
            opacity: 0.66;
          }
        }
      }
    }
  }
  
  &__list {
    display: flex;
    margin: 0 auto;
  }
  
  &__item {
   
    a {
      color: inherit;
      text-decoration: none;
      padding: 1rem;
      
      &:hover {
        text-decoration: underline;
      }
    }
    
    &[data-nav-expand] {
      
      a {
        
        &::after {
          content: '+';
          display: inline-block;
          margin-left: 0.5em;
          position: relative;
          top: -0.01em;
          font-weight: 600;
          color: $c-brand;
          transition: $timing $easing;
          transition-property: color, opacity;
          
          [data-nav-fixed="false"]:not([data-nav-expanded]) & {
            opacity: 0.5;
            color: currentColor;
          }
        }
      }
    }
  }
  
  &__expand {
    position: absolute;
    pointer-events: none;
    top: 100%;
    left: 0;
    width: 100%;
    opacity: 0;
    z-index: 2;
    transition: opacity $timing $easing;

    [data-nav-expanded] & {
      opacity: 1;
      transition-delay: $timing / 2;
    }
    
    .group {
      display: grid;
      padding: 2rem 0 3rem;
    }
    
    .u-nav {
      
      &__list {
        flex: 1;
        margin: 0;
        flex-wrap: wrap;
      }
      
      &__item {
        max-width: 8rem;
        width: 50%;
        
        a {
          color: $c-brand;
          text-decoration: underline;
          display: block;
          padding: 0.25em 0;
          
          &:hover {
            color: $c-dark;
          }
        }
      }
    }
  }
  
  &__expand-item {
    display: flex;
    align-items: flex-start;
    flex-wrap: wrap;
    grid-area: 1 / 1;
  }
  
  @at-root {
    $items: snowsports, outdoors, stores;
    
    %expanded-item {
      opacity: 0;
      transform: translateY(-0.5rem);
      transition: $timing $easing;
      transition-property: opacity, transform;
    }
    
    %expanded-item-open {
      opacity: 1;
      pointer-events: auto;
      transform: none;
      transition-delay: $timing;
    }
    
    @each $item in $items {
      
      [data-nav-expand-item="#{$item}"] {
        @extend %expanded-item;
        
        [data-nav-expanded="#{$item}"] & {
          @extend %expanded-item-open;
        }
      }
    }
  }
  
  &__subtitle {
    font-weight: 600;
    margin: 0 0 0.5em;
    width: 100%;
  }
}

.u-hero {
  color: $c-light;
  display: flex;
  min-height: 66.66vw;
  padding-top: 3rem;
  overflow: hidden;
  position: relative;
  
  .h1 {
    left: 50%;
    width: 110vw;
    margin-left: -55vw;
    display: block;
    position: relative;
    font-size: 21.5vw;
    white-space: nowrap;
    text-align: center;
    
    @media screen and (min-width: 1400px) {
      font-size: 301px;
    }
  }
  
  &__bg,
  &__fg {
    background: url('https://i.postimg.cc/RCGPRF6z/skiier.jpg') center no-repeat;
    background-size: cover;
    position: absolute;
    pointer-events: none;
    top: 0;
    left: -5%;
    width: 110%;
    will-change: transform;
    height: 100%;
  }
  
  &__bg {
    
    &::before,
    &::after {
      background: inherit;
      content: '';
      position: absolute;
      top: 0;
      height: 100%;
      width: 100%;
    }
    
    &::before {
      filter: blur(5px);
    }
    
    &::after {
      // display: none;
    }
  }
  
  &__fg {
    background-image: url('https://i.postimg.cc/WbHXBHwW/skiier-mask.png');
    z-index: 3;
  }
  
  .group {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    margin-top: auto;
    margin-bottom: auto;
    position: relative;
    padding: calc(5vw + 2rem) 0;
  }
  
  .p {
    color: $c-dark;
    font-size: 2rem;
    font-weight: 300;
    margin: 0 0 0.5em;
    width: 66.66%;
    max-width: 20em;
    order: -1;
    position: relative;
    z-index: 2;
  }
  
  .m-logo {
    
    &__chunk {
      color: inherit;
      
      &--1 {
        opacity: 0.66;
      }
    }
  }
}

.u-content {
  min-height: 200vh;
  
  p {
    margin: 0.5em auto;
    line-height: 1.5;
  }
}


.u-hero__bg {
  
  &::before {
    background-image: url('data:image/jpeg;base64,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');
  }
}
!

JS 

              
                // Elements
const navParent = document.querySelector('[data-nav]');
const navExpandable = document.querySelector(`[data-nav-expandable]`);

const heroBg = document.querySelector('[data-hero-bg]');
const heroFg = document.querySelector('[data-hero-fg]');

// Scroll
const scroll = window.requestAnimationFrame;
let lastPosition = -1;

// Heights
const heroBgHeight = heroBg.clientHeight;

// Loop
const loop = () => {
  var windowY = window.pageYOffset;
  
  if (lastPosition === windowY || !heroBg || !heroFg || !navParent) {
    scroll(loop);
    return false;
  } else lastPosition = windowY;
  
  navParent.setAttribute(`data-nav-fixed`, windowY > 0);

  console.log(windowY, heroBgHeight);
  if (windowY <= heroBgHeight) {
    const translateY = windowY / heroBgHeight * -3;
    const translateX = windowY / heroBgHeight * 10;
    const transform = `translate3d(${translateY.toFixed(3)}%, ${translateX.toFixed(3)}%, 0)`; 

    heroBg.style.transform = transform;
    heroFg.style.transform = transform;
  }

  scroll(loop);
}

loop();

const expandableItems = document.querySelectorAll('[data-nav-expand]');

expandableItems.forEach(item => {
  item.addEventListener('mouseover', e => {
    const expand = item.getAttribute(`data-nav-expand`);
    
    navParent.setAttribute(`data-nav-expanded`, expand);
  });
});

navParent.addEventListener('mouseleave', e => {
  navParent.removeAttribute(`data-nav-expanded`);
});

navParent.style.setProperty('--expandable-height', `${navExpandable.clientHeight}px`);
!
999px

Console