:root {
  --white: #ffffff;
  --blue: #81d0eb;
  --black: #000000;
  --page-gutter: clamp(1rem, 2.4vw, 2.75rem);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-width: 320px;
  min-height: 100%;
  margin: 0;
  background: var(--black);
}

body {
  color: var(--white);
  font-family: "Annapurna SIL", Georgia, serif;
}

.landing-page {
  position: relative;
  min-height: 100svh;
  isolation: isolate;
  overflow: hidden;
  background: var(--black);
}

.video-layer,
.background-video,
.atmosphere {
  position: absolute;
  inset: 0;
}

.video-layer {
  z-index: -3;
  overflow: hidden;
  background: #111;
}

.background-video {
  /* The source has archival captions and a corner watermark. The overscan
     keeps both outside the visible frame while retaining the aircraft. */
  width: 124%;
  height: 124%;
  top: -12%;
  left: -12%;
  object-fit: cover;
  object-position: center 38%;
  filter: grayscale(1) contrast(1.1) brightness(0.32);
}

.atmosphere {
  z-index: -2;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(0, 0, 0, 0.48) 0%, rgba(0, 0, 0, 0.36) 35%, rgba(0, 0, 0, 0.82) 100%),
    radial-gradient(ellipse at center, rgba(0, 0, 0, 0.18) 25%, rgba(0, 0, 0, 0.68) 100%);
}

.film-grain {
  position: absolute;
  z-index: -1;
  inset: -20%;
  pointer-events: none;
  opacity: 0.3;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.72'/%3E%3C/svg%3E");
  background-size: 700px 700px;
  mix-blend-mode: screen;
  animation: film-noise 140ms steps(2, end) infinite;
}

.film-grain::after {
  position: absolute;
  inset: 0;
  content: "";
  opacity: 0.24;
  background: repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.08) 0 1px, transparent 1px 3px);
  mix-blend-mode: overlay;
}

@keyframes film-noise {
  0% { background-position: 0 0; }
  25% { background-position: -38px 21px; }
  50% { background-position: 24px -46px; }
  75% { background-position: 61px 34px; }
  100% { background-position: -17px -29px; }
}

.hero {
  display: grid;
  min-height: 100svh;
  place-items: center;
  padding: 5rem var(--page-gutter) 6rem;
}

h1 {
  margin: 0;
  color: var(--blue);
  font-size: clamp(3.25rem, 8.6vw, 8.75rem);
  font-weight: 600;
  line-height: 0.95;
  letter-spacing: -0.055em;
  text-align: center;
  text-shadow: 0 0.08em 0.25em rgba(0, 0, 0, 0.24);
}

.site-nav {
  position: absolute;
  right: var(--page-gutter);
  bottom: clamp(1rem, 2.4vw, 2.25rem);
  left: var(--page-gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.corner-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--white);
  font-size: clamp(1rem, 1.35vw, 1.35rem);
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  transition: color 180ms ease, transform 180ms ease;
}

.corner-link:hover,
.corner-link:focus-visible {
  color: var(--blue);
}

.corner-link:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 0.35rem;
}

.arrow {
  font-size: 1.1em;
}

@media (max-width: 620px) {
  .background-video {
    width: 142%;
    height: 142%;
    top: -21%;
    left: -21%;
    object-position: 57% center;
  }

  .hero {
    padding-bottom: 8rem;
  }

  .site-nav {
    align-items: flex-end;
  }

  .corner-link {
    max-width: 45%;
    font-size: 1rem;
  }

  .corner-link--right {
    justify-content: flex-end;
    text-align: right;
  }
}

@media (prefers-reduced-motion: reduce) {
  .background-video {
    display: none;
  }

  .video-layer {
    background: linear-gradient(135deg, #4b4b4b, #151515 70%);
  }

  .film-grain {
    animation: none;
  }

  .corner-link,
  .arrow {
    transition: none;
  }
}