*,
*::before,
*::after {
  box-sizing: border-box;
}

@property --rgb-hue {
  syntax: "<number>";
  inherits: true;
  initial-value: 0;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #000;
}

html {
  --rgb-hue: 0;
  --section-gap: 20px;
  color-scheme: dark;
  animation: rgb-timeline 6s linear infinite;
}

body {
  height: 100vh;
  height: 100dvh;
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr) auto;
  justify-items: center;
  row-gap: var(--section-gap);
  padding: 12px;
}

.page-header h1 {
  margin: 0;
  color: hsl(var(--rgb-hue) 100% 50%);
  font-family: "UnifrakturMaguntia", "Old English Text MT", serif;
  font-size: 112px;
  font-weight: 400;
  line-height: 1;
}

.site-nav {
  z-index: 3;
  display: flex;
  width: min(100%, 1100px);
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  color: hsl(var(--rgb-hue) 100% 50%);
}

/* Chrome drops var() in color/border/background/outline on visited links, so links inherit the hue from .site-nav. */
.site-nav a,
.site-nav .nav-toggle {
  padding: 8px 13px;
  color: inherit;
  border: 1px solid currentcolor;
  background: rgba(9, 13, 27, 0.9);
  box-shadow: 0 0 8px hsl(var(--rgb-hue) 100% 50% / 0.45);
  opacity: 1;
  font-family: "DM Mono", "Courier New", monospace;
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  text-transform: uppercase;
  transition: transform 150ms ease;
}

.site-nav .nav-toggle {
  border-radius: 0;
  cursor: pointer;
}

.site-nav .nav-toggle:hover,
.site-nav .nav-toggle:focus-visible,
.site-nav .nav-toggle[aria-expanded="true"] {
  box-shadow: 0 0 8px hsl(var(--rgb-hue) 100% 50% / 0.45), inset 0 0 0 100px hsl(var(--rgb-hue) 100% 50% / 0.24);
}

.site-nav .nav-toggle:focus-visible {
  outline: 2px solid currentcolor;
  outline-offset: 3px;
}

.site-nav .navbar-collapse {
  flex-grow: 0;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.site-nav .nav-label {
  color: inherit;
  text-shadow: 0 0 6px hsl(var(--rgb-hue) 100% 50% / 0.6);
}

.site-nav a:hover,
.site-nav a:focus-visible,
.site-nav a.is-current {
  box-shadow: 0 0 8px hsl(var(--rgb-hue) 100% 50% / 0.45), inset 0 0 0 100px hsl(var(--rgb-hue) 100% 50% / 0.24);
  transform: translateY(-1px);
}

.site-nav a:focus-visible {
  outline: 2px solid currentcolor;
  outline-offset: 3px;
}

.photo-carousel {
  display: grid;
  width: min(100%, 1240px);
  align-self: stretch;
  min-height: 0;
  grid-template-columns: 52px minmax(0, 1fr) 52px;
  align-items: center;
  gap: 16px;
}

.site-footer {
  position: relative;
  z-index: 5;
  width: 100%;
  align-self: end;
  padding: 0;
  color: hsl(var(--rgb-hue) 100% 50%);
  font-family: "DM Mono", "Courier New", monospace;
  font-size: 11px;
  line-height: 1.35;
  text-align: center;
}

.site-footer p {
  margin: 0;
}

.carousel-stage {
  position: relative;
  display: grid;
  width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  place-items: center;
  justify-self: center;
}

.carousel-image {
  position: absolute;
  z-index: 1;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 0;
  object-fit: contain;
  opacity: 0;
  transform: translateX(0);
  transition: opacity 420ms cubic-bezier(0.22, 0.61, 0.36, 1),
    transform 420ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.carousel-image.is-loaded {
  opacity: 1;
  transform: translateX(0);
}

.carousel-image.slide-from-right:not(.is-loaded) {
  opacity: 0;
  transform: translateX(8%);
}

.carousel-image.slide-from-left:not(.is-loaded) {
  opacity: 0;
  transform: translateX(-8%);
}

.carousel-image-outgoing {
  z-index: 0;
  pointer-events: none;
}

.carousel-image-outgoing.slide-to-left {
  opacity: 0;
  transform: translateX(-8%);
}

.carousel-image-outgoing.slide-to-right {
  opacity: 0;
  transform: translateX(8%);
}

.carousel-button {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border: 1px solid hsl(var(--rgb-hue) 100% 50%);
  border-radius: 50%;
  background: rgba(9, 13, 27, 0.84);
  color: hsl(var(--rgb-hue) 100% 50%);
  cursor: pointer;
  transition: background 150ms ease, transform 150ms ease;
  box-shadow: 0 0 12px hsl(var(--rgb-hue) 100% 50% / 0.45);
}

.carousel-button span {
  margin-top: -4px;
  font-family: Arial, sans-serif;
  font-size: 36px;
  line-height: 1;
}

.carousel-button:hover,
.carousel-button:focus-visible {
  background: rgba(130, 203, 255, 0.16);
  transform: scale(1.06);
}

@keyframes rgb-timeline {
  0%,
  100% {
    --rgb-hue: 0;
  }
  33% {
    --rgb-hue: 120;
  }
  66% {
    --rgb-hue: 240;
  }
}

.photo-count {
  position: absolute;
  z-index: 2;
  right: 10px;
  bottom: 10px;
  padding: 5px 8px;
  background: rgba(9, 13, 27, 0.82);
  color: #e8edff;
  font-family: "DM Mono", "Courier New", monospace;
  font-size: 10px;
}

@media (prefers-reduced-motion: reduce) {
  .carousel-image {
    transition: none;
  }
}

@media (max-width: 480px) {
  body {
    --section-gap: 14px;
    padding: 10px 8px;
  }

  .page-header h1 {
    font-size: 88px;
  }

  .photo-carousel {
    grid-template-columns: 36px minmax(0, 1fr) 36px;
    gap: 6px;
  }

  .site-nav {
    gap: 5px;
    padding: 0;
  }

  .site-nav a {
    padding: 8px 9px;
    font-size: 11px;
  }

  .site-footer {
    font-size: 9px;
  }

  .carousel-stage {
    width: 100%;
  }

  .carousel-button {
    width: 34px;
    height: 34px;
  }

  .carousel-button span {
    font-size: 29px;
  }

  .photo-count {
    right: 5px;
    bottom: 5px;
  }
}

/* Below Bootstrap's sm breakpoint the links collapse into a dropdown that overlays the page. */
@media (max-width: 575.98px) {
  .site-nav .navbar-collapse {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    left: 0;
    width: min(100%, 260px);
    margin-inline: auto;
    background: #000;
  }

  .site-nav .navbar-collapse.show,
  .site-nav .navbar-collapse.collapsing {
    display: flex;
    flex-direction: column;
    align-items: stretch;
  }

  /* Skip Bootstrap's height animation so the menu snaps open/closed with no in-between layout. */
  .site-nav .navbar-collapse.collapsing {
    transition: none;
  }

  .site-nav .navbar-collapse a {
    flex-shrink: 0;
    text-align: center;
  }
}