.intro {
  position: fixed;
  inset: 0;
  z-index: 10;
  overflow: hidden;
  background: var(--ink);
  contain: strict;
}

.intro.is-fading {
  opacity: 0;
  transition: opacity 0.7s linear;
}

/* Everything that zooms out together. Positioned in viewport pixels; transformed by circleReveal.js. */
.intro__stage {
  position: absolute;
  inset: 0;
  transform-origin: 0 0;
  will-change: transform;
}

/* The film's own colours, blurred, filling any space around it — and anything the zoom-out exposes. */
.intro__backdrop {
  position: absolute;
  inset: -45%;
  background: var(--vermilion);
}

.intro__backdrop canvas {
  display: block;
  width: 100%;
  height: 100%;
  filter: blur(56px) saturate(1.2);
  transform: scale(1.15);
}

.intro__backdrop::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 55% at 50% 48%, transparent 40%, rgba(64, 3, 0, 0.3) 100%);
}

/* In landscape the backdrop only peeks out at the edges, so keep it bright and continuous with the film. */
.intro:not(:has(.is-arch)) .intro__backdrop::after { display: none; }

.intro__frame {
  position: absolute;
  overflow: hidden;
  transition: border-radius 0.5s var(--ease-in-out), box-shadow 0.5s var(--ease-in-out);
}

/* Portrait: a temple-arch window with the film's own sticker outline (ink, gold, ink). */
.intro__frame.is-arch {
  box-shadow:
    0 0 0 2px var(--ink),
    0 0 0 8px var(--gold),
    0 0 0 10px var(--ink),
    0 40px 90px -30px rgba(20, 0, 0, 0.75);
}

/* As the camera pulls back, the arch dissolves so only the picture is left in the lens. */
.intro.is-leaving .intro__frame.is-arch {
  border-radius: 0 !important;
  box-shadow: 0 0 0 0 transparent;
}

.intro__media {
  position: absolute;
  opacity: 0;
  transform: scale(1.04);
  transition: opacity 1.2s var(--ease-out), transform 2.6s var(--ease-out);
}

.intro.is-visible .intro__media {
  opacity: 1;
  transform: none;
}

.intro__media.feather-x {
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 7%, #000 93%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 7%, #000 93%, transparent);
}

.intro__media.feather-y {
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 7%, #000 93%, transparent);
  mask-image: linear-gradient(180deg, transparent, #000 7%, #000 93%, transparent);
}

.intro__media video,
.intro__final {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: fill; /* the box is already sized to the film's exact aspect ratio */
}

.intro__media video::-webkit-media-controls { display: none !important; }

/* The exact final frame as a still: the anchor the transition is built on. */
.intro__final { opacity: 0; }
.intro.is-final .intro__final { opacity: 1; }
.intro.is-final-fade .intro__final { transition: opacity 0.28s linear; }

/* Buffering: a small coin-gold ring, only if the film actually stalls. */
.intro__loader {
  position: absolute;
  left: 50%;
  bottom: calc(env(safe-area-inset-bottom) + 92px);
  width: 22px;
  height: 22px;
  margin-left: -11px;
  border-radius: 50%;
  border: 2px solid rgba(242, 193, 78, 0.25);
  border-top-color: var(--gold);
  opacity: 0;
  transition: opacity 0.4s;
  animation: spin 0.9s linear infinite;
}

.intro.is-buffering .intro__loader { opacity: 1; transition-delay: 0.4s; }

@keyframes spin { to { transform: rotate(1turn); } }

/* Shown when autoplay is blocked, or with reduced motion. */
.intro__play {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  display: grid;
  justify-items: center;
  gap: 14px;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
  color: var(--paper);
}

.intro__play[hidden] { display: none; }

.intro__play-icon {
  width: 84px;
  height: 84px;
  border-radius: 50%;
  background: rgba(64, 3, 0, 0.55);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 0 0 3px var(--gold), 0 0 0 4.5px rgba(64, 3, 0, 0.5), 0 18px 40px -12px rgba(20, 0, 0, 0.6);
  position: relative;
  transition: transform 0.4s var(--ease-out);
}

.intro__play-icon::after {
  content: '';
  position: absolute;
  left: 34px;
  top: 27px;
  border-style: solid;
  border-width: 15px 0 15px 24px;
  border-color: transparent transparent transparent var(--paper);
}

.intro__play:hover .intro__play-icon { transform: scale(1.06); }

.intro__play-label {
  font-style: italic;
  font-size: 1.25rem;
  font-variation-settings: 'opsz' 36, 'SOFT' 100;
  text-shadow: 0 1px 12px rgba(20, 0, 0, 0.6);
}

/* The lens's gold rim during the transition — it becomes the medallion's ring. */
.iris-rim {
  position: fixed;
  left: 0;
  top: 0;
  z-index: 11;
  width: 0;
  height: 0;
  border-radius: 50%;
  pointer-events: none;
  opacity: 0;
  will-change: transform;
}