/* Student-made, 16-frame jellyfish intro. The original video is unmodified. */
.student-loader {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: grid;
  place-items: center;
  overflow: hidden;
  background: #0d2544;
  color: #f5ebc4;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  isolation: isolate;
  transition: opacity 300ms ease, visibility 300ms ease;
}

html.is-student-intro { overflow: hidden; }
html.is-student-intro .student-loader {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.student-loader__label {
  position: absolute;
  inset: max(2rem, env(safe-area-inset-top)) 1rem auto;
  margin: 0;
  text-align: center;
  font: 500 11px/1.5 system-ui, sans-serif;
  letter-spacing: .14em;
  text-transform: uppercase;
  opacity: .76;
}

.student-loader__stage {
  position: relative;
  width: min(94vw, 720px);
  aspect-ratio: 1120 / 696;
  max-height: calc(100svh - 10rem);
  /* Screen blends the source's black background seamlessly into the navy. */
  mix-blend-mode: screen;
  filter: brightness(1.8) saturate(.75);
}

.student-loader__poster,
.student-loader__video {
  display: block;
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.student-loader__video { opacity: 0; }
.student-loader.is-playing .student-loader__video { opacity: 1; }
.student-loader.is-playing .student-loader__poster { opacity: 0; }

.student-loader__skip {
  position: absolute;
  bottom: max(2rem, env(safe-area-inset-bottom));
  min-width: 100px;
  min-height: 44px;
  padding: .6rem 1rem;
  border: 0;
  border-radius: 3px;
  background: transparent;
  color: inherit;
  font: 400 12px/1.5 system-ui, sans-serif;
  letter-spacing: .06em;
  text-decoration: underline;
  text-underline-offset: 5px;
  cursor: pointer;
  opacity: .8;
}
.student-loader__skip:hover,
.student-loader__skip:focus-visible { opacity: 1; }
.student-loader__skip:focus-visible {
  outline: 1px solid currentColor;
  outline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
  .student-loader { display: none; transition: none; }
}
@media print {
  .student-loader { display: none !important; }
}