.collection-page {
  --collection-gutter: clamp(24px, 3vw, 40px);
  --collection-media-gap: clamp(9px, 1.2vw, 19px);
  --collection-radius: clamp(7px, .75vw, 12px);
}

.collection-page .container {
  width: 100%;
  max-width: 1440px;
  padding-inline: var(--collection-gutter);
}

.collection-main {
  flex: 1 0 auto;
  padding-block: clamp(115px, 12vw, 165px) clamp(65px, 10vw, 145px);
}

.collection-intro {
  margin-bottom: clamp(44px, 6vw, 90px);
}

.collection-intro h1,
.collection-project h2 {
  margin: 0 0 10px;
  line-height: 1.05;
  letter-spacing: -.035em;
}

.collection-intro h1 {
  font-size: clamp(2.1rem, 5vw, 4.25rem);
  font-weight: 800;
}

.collection-intro p,
.collection-project-copy p {
  max-width: 42rem;
  margin: 0;
  font-size: 1rem;
  line-height: 1.4;
  color: #444;
}

.collection-projects {
  display: grid;
  gap: clamp(60px, 8vw, 125px);
}

.collection-project-copy {
  margin-bottom: clamp(15px, 2vw, 27px);
}

.collection-project h2 {
  font-size: clamp(1.45rem, 2.6vw, 2.35rem);
  font-weight: 700;
}

.collection-project-link {
  display: inline-block;
  margin-top: 10px;
  color: inherit;
  font-size: .875rem;
  font-weight: 600;
  text-underline-offset: .2em;
}

.collection-page a:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 4px;
}

.collection-media {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
  gap: var(--collection-media-gap);
  align-items: start;
}

.collection-teaser,
.collection-still {
  display: block;
  width: 100%;
  border-radius: var(--collection-radius);
  background: #d6d6d6;
}

.collection-teaser {
  position: relative;
  aspect-ratio: 8 / 3;
  overflow: hidden;
}

.collection-still {
  aspect-ratio: 4 / 3;
  overflow: hidden;
}

.collection-still img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.collection-teaser img,
.collection-teaser iframe {
  position: absolute;
  width: 100%;
}

.collection-teaser img {
  inset: 0;
  height: 100%;
  object-fit: cover;
}

/* Centre-crop the 16:9 player to the wider desktop teaser box. */
.collection-teaser iframe {
  inset: 50% auto auto 0;
  height: 150%;
  border: 0;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-50%);
  transition: opacity .5s ease;
}

.collection-teaser.is-playing iframe {
  opacity: 1;
}

.collection-contact {
  margin-top: clamp(60px, 8vw, 125px);
}

@media (max-width: 720px) {
  .collection-intro h1 {
    font-size: clamp(2.5rem, calc(15vw - .5rem), 4.25rem);
    letter-spacing: -.055em;
  }

  .collection-media {
    grid-template-columns: 1fr;
  }

  .collection-teaser {
    aspect-ratio: 16 / 9;
  }

  .collection-teaser iframe {
    inset: 0;
    height: 100%;
    transform: none;
  }

  .collection-still {
    display: none;
  }
}

@media (max-width: 360px) {
  .collection-page > header {
    column-gap: 8px;
    padding-inline: 12px;
  }

  .collection-page.expertise-preview > header .nav {
    gap: 6px;
    font-size: .875rem;
  }

  .collection-page > header .nav :is(a, button) {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    min-height: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .collection-teaser iframe {
    display: none;
  }
}