@media (max-width: 620px) {
  .section {
    position: relative;
    isolation: isolate;
    overflow: hidden;
  }

  .section::before,
  .section::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
  }

  .section::before {
    z-index: -2;
    opacity: .42;
    background-repeat: no-repeat;
    filter: grayscale(.12) contrast(1.12);
  }

  .section::after {
    z-index: -1;
    background: linear-gradient(180deg, rgba(0,0,0,.68), rgba(0,0,0,.38) 48%, rgba(0,0,0,.72));
  }

  #process::before {
    background-image:
      url("../CADs/Design.png"),
      url("../CADs/Charlie%20CAD%20no%20measurements.jpg");
    background-position: center 12%, center 82%;
    background-size: 118% auto, 108% auto;
  }

  .assurance::before {
    background-image: url("../CADs/JD%20CAD%20no%20measurements.png");
    background-position: center;
    background-size: 128% auto;
  }

  .final-cta::before {
    background-image: url("../CADs/rose%20gold%20cad%20no%20measurements.png");
    background-position: center;
    background-size: 125% auto;
  }

  .hero {
    position: relative;
    isolation: isolate;
    min-height: 780px;
    overflow: hidden;
    padding-inline: 8px;
  }

  .hero > div:first-child {
    position: relative;
    z-index: 2;
    padding: 40px 4px 150px;
  }

  .hero > div:first-child::before {
    content: "";
    position: absolute;
    z-index: -1;
    inset: 0 -14px 50px;
    background: linear-gradient(180deg, rgba(0,0,0,.58), rgba(0,0,0,.3) 55%, rgba(0,0,0,.68));
  }

  .composition {
    position: absolute;
    z-index: 0;
    inset: 0 -24px;
    display: block;
    min-height: 0;
    overflow: hidden;
    pointer-events: none;
    mask-image: linear-gradient(to bottom, transparent 0, #000 8%, #000 88%, transparent 100%);
  }

  .cad-shot,
  .cad-shot:nth-child(n) {
    position: absolute;
    width: 72%;
    height: 260px;
    opacity: .48;
    filter: grayscale(.12) contrast(1.14);
    transform: rotate(-5deg);
  }

  .cad-shot img,
  .cad-shot:nth-child(n) img {
    width: 100%;
    height: 100%;
    max-height: none;
    aspect-ratio: auto;
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .cad-shot:nth-child(1) { left: -20%; top: 40px; }
  .cad-shot:nth-child(2) { right: -24%; top: 190px; transform: rotate(6deg); }
  .cad-shot:nth-child(3) { left: -18%; top: 355px; transform: rotate(4deg); }
  .cad-shot:nth-child(4) { right: -22%; top: 515px; transform: rotate(-7deg); }
  .cad-shot:nth-child(5) { left: 1%; top: 650px; width: 96%; transform: rotate(2deg); }
}

@media (max-width: 620px) and (prefers-reduced-motion: reduce) {
  .cad-shot,
  .cad-shot:nth-child(n) { transform: none; }
}

/* One uninterrupted artwork layer behind the complete mobile page. */
@media (max-width: 620px) {
  .section::before,
  .section::after {
    display: none;
  }

  .atelier,
  .assurance,
  .section,
  .site-footer {
    background-color: rgba(0,0,0,.5);
  }

  .hero {
    position: static;
    isolation: auto;
    overflow: visible;
  }

  .hero > div:first-child {
    position: relative;
    z-index: 3;
  }

  .composition {
    position: fixed;
    z-index: 0;
    inset: 0;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    mask-image: linear-gradient(to bottom, #000, #000);
  }

  .topbar,
  main,
  .section,
  .site-footer {
    position: relative;
    z-index: 2;
  }

  .cad-shot,
  .cad-shot:nth-child(n) {
    opacity: .4;
  }

  .cad-shot:nth-child(1) { left: -18%; top: -2%; }
  .cad-shot:nth-child(2) { right: -22%; top: 18%; }
  .cad-shot:nth-child(3) { left: -20%; top: 39%; }
  .cad-shot:nth-child(4) { right: -20%; top: 60%; }
  .cad-shot:nth-child(5) { left: -5%; top: 80%; width: 110%; }
}

/* Full-height irregular CAD wallpaper on mobile. */
@media (max-width: 620px) {
  body {
    position: relative;
    isolation: isolate;
    background: #000;
  }

  .atelier {
    background: transparent;
  }

  .atelier::before,
  .atelier::after {
    display: none;
  }

  .composition {
    display: none;
  }

  .cad-wallpaper {
    position: absolute;
    z-index: 0;
    inset: 0;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-auto-rows: clamp(230px, 68vw, 310px);
    gap: 12px 2px;
    width: 100%;
    min-height: 100%;
    overflow: hidden;
    background: #000;
    pointer-events: none;
  }

  .cad-wallpaper::after {
    content: "";
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,.33);
  }

  .cad-wallpaper img {
    width: 126%;
    height: 116%;
    align-self: center;
    justify-self: center;
    object-fit: contain;
    opacity: .58;
    filter: grayscale(.1) contrast(1.14);
    transform: rotate(-5deg) scale(1.08);
  }

  .cad-wallpaper img:nth-child(4n + 2) {
    transform: translate(13%, 17%) rotate(7deg) scale(1.28);
  }

  .cad-wallpaper img:nth-child(4n + 3) {
    transform: translate(-12%, -10%) rotate(4deg) scale(1.42);
  }

  .cad-wallpaper img:nth-child(4n) {
    transform: translate(8%, 4%) rotate(-8deg) scale(.94);
  }

  .cad-wallpaper img:nth-child(5n) {
    grid-column: span 2;
    width: 105%;
    transform: translateY(-5%) rotate(2deg) scale(1.18);
  }

  .topbar,
  main,
  .site-footer {
    position: relative;
    z-index: 2;
  }

  .atelier,
  .assurance,
  .section,
  .site-footer {
    background-color: rgba(0,0,0,.42);
  }
}