* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body.about-body {
  height: 100%;
  overflow: hidden;
}

body.about-body {
  position: relative;
  width: 100%;
  height: 100dvh;
  height: 100vh; /* fallback */
  background-color: #05261D;
  transition: background-color 0.4s ease;
  font-family: "Neue Haas Grotesk Light", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: 300;
}

/* ---------- Poster stage ---------- */
.poster-stage {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(24px, 6vw, 64px);
}

.poster-wrap {
  position: relative;
  display: block;
  width: min(90vw, 640px);
  aspect-ratio: 4 / 5;
}

.poster {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  pointer-events: none;
  user-select: none;
  -webkit-user-drag: none;
  transition: opacity 0.4s ease;
}

.poster--base {
  opacity: 1;
}

.poster--alt {
  opacity: 0;
}

/* Desktop hover anywhere on the page swaps the poster */
@media (hover: hover) {
  body.about-body.poster-hover {
    background-color: #F5F5F5;
  }
  body.about-body.poster-hover .poster--base {
    opacity: 0;
  }
  body.about-body.poster-hover .poster--alt {
    opacity: 1;
  }
}

/* Touch: swap while the finger is on the screen, revert on release */
body.about-body.poster-active {
  background-color: #F5F5F5;
}
body.about-body.poster-active .poster--base {
  opacity: 0;
}
body.about-body.poster-active .poster--alt {
  opacity: 1;
}

/* ---------- Back link ---------- */
.back-link {
  position: absolute;
  top: clamp(16px, 4vh, 32px);
  left: clamp(16px, 4vw, 32px);
  color: #F5F5F5;
  transition: color 0.4s ease, opacity 0.3s ease;
  font-size: 20px;
  text-decoration: none;
  line-height: 1;
  z-index: 10;
  opacity: 0.85;
}

.back-link:hover {
  opacity: 1;
}

body.about-body.poster-hover .back-link,
body.about-body.poster-active .back-link {
  color: #05261D;
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .poster {
    transition: none;
  }
}