:root {
  color-scheme: dark;
  --ink: oklch(0.98 0.01 250);
  --focus: oklch(0.96 0.04 230);
  --page: oklch(0.11 0.035 255);
  --shade: oklch(0.08 0.025 255 / 0.4);
  --prompt: oklch(0.14 0.04 255 / 0.88);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html,
body {
  width: 100%;
  min-width: 20rem;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--page);
}

body {
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.gateway {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  width: 100%;
  height: 100dvh;
  min-height: 100svh;
  overflow: hidden;
  background: var(--page);
}

.gateway::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  z-index: 2;
  width: 2px;
  background: oklch(0.88 0.11 235 / 0.74);
  box-shadow:
    0 0 0.9rem oklch(0.78 0.16 240 / 0.72),
    0 0 2.8rem oklch(0.69 0.18 247 / 0.5);
  transform: translateX(-50%);
  pointer-events: none;
}

.brand {
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  color: var(--ink);
  text-decoration: none;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.brand__image {
  position: absolute;
  inset: 0;
  z-index: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  user-select: none;
  transition: filter 500ms var(--ease-out);
}

.brand--ra {
  background: oklch(0.74 0.08 240);
}

.brand--ra .brand__image {
  object-position: right center;
}

.brand--emerald {
  background: oklch(0.1 0.04 258);
}

.brand--emerald .brand__image {
  object-position: left center;
}

.brand__logo {
  position: absolute;
  z-index: 1;
  display: block;
  pointer-events: none;
}

.brand__logo img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: auto;
  user-select: none;
}

.brand__logo--emerald {
  top: 28%;
  left: 50%;
  width: min(64%, 39rem);
  transform: translate(-50%, -50%);
}

.brand::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: var(--shade);
  opacity: 0;
  pointer-events: none;
  transition: opacity 420ms var(--ease-out);
}

.gateway[data-active="ra"] .brand--emerald::after,
.gateway[data-active="emerald"] .brand--ra::after {
  opacity: 1;
}

.gateway[data-active="ra"] .brand--ra .brand__image,
.gateway[data-active="emerald"] .brand--emerald .brand__image {
  filter: saturate(1.06) contrast(1.025);
}

.brand__prompt {
  position: absolute;
  left: 50%;
  bottom: max(1.5rem, calc(env(safe-area-inset-bottom) + 0.75rem));
  z-index: 5;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  max-width: calc(100% - 2rem);
  padding: 0.72rem 1rem;
  border-radius: 999px;
  background: var(--prompt);
  color: var(--ink);
  font-size: clamp(0.82rem, 1.1vw, 0.95rem);
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  white-space: nowrap;
  opacity: 0;
  transform: translate(-50%, 0.65rem);
  transition:
    opacity 300ms var(--ease-out),
    transform 420ms var(--ease-out);
  pointer-events: none;
}

.brand__prompt span {
  font-size: 1.05em;
}

.brand:is(:hover, :focus-visible) .brand__prompt {
  opacity: 1;
  transform: translate(-50%, 0);
}

.brand:focus-visible {
  outline: 0.2rem solid var(--focus);
  outline-offset: -0.55rem;
}

.focus-lens {
  --lens-x: 50vw;
  --lens-y: 50vh;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 3;
  width: clamp(13rem, 34vmin, 27rem);
  aspect-ratio: 1;
  border-radius: 46% 54% 58% 42% / 42% 47% 53% 58%;
  opacity: 0;
  transform: translate3d(var(--lens-x), var(--lens-y), 0) translate(-50%, -50%);
  transition: opacity 260ms var(--ease-out);
  pointer-events: none;
  will-change: transform, opacity;
}

.focus-lens::before,
.focus-lens::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  opacity: 0;
  transition: opacity 340ms var(--ease-out);
}

.focus-lens::before {
  border: 1px solid oklch(0.58 0.15 245 / 0.66);
  background:
    radial-gradient(circle at 38% 34%, oklch(0.93 0.07 230 / 0.3), transparent 36%),
    linear-gradient(135deg, oklch(0.54 0.17 250 / 0.27), oklch(0.75 0.12 230 / 0.14));
  box-shadow:
    inset 0 0 2.8rem oklch(0.92 0.06 230 / 0.11),
    0 0 4rem oklch(0.62 0.17 248 / 0.2);
}

.focus-lens::after {
  border: 1px solid oklch(0.73 0.19 25 / 0.62);
  background:
    radial-gradient(circle at 38% 34%, oklch(0.78 0.18 25 / 0.3), transparent 36%),
    linear-gradient(135deg, oklch(0.55 0.23 25 / 0.28), oklch(0.48 0.18 250 / 0.18));
  box-shadow:
    0 0 3.8rem oklch(0.55 0.22 25 / 0.18),
    0 0 5.2rem oklch(0.52 0.18 250 / 0.12);
}

.gateway.is-lens-visible .focus-lens {
  opacity: 1;
}

.gateway[data-active="ra"] .focus-lens::before,
.gateway[data-active="emerald"] .focus-lens::after {
  opacity: 1;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

@media (orientation: portrait) {
  .gateway {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: repeat(2, minmax(0, 1fr));
  }

  .brand__prompt {
    bottom: 1rem;
  }

  .brand--emerald .brand__prompt {
    bottom: max(1rem, calc(env(safe-area-inset-bottom) + 0.6rem));
  }

  .brand__logo--emerald {
    top: 30%;
    left: 50%;
    width: min(76%, 30rem);
  }

  .gateway::after {
    top: 50%;
    right: 0;
    bottom: auto;
    left: 0;
    width: auto;
    height: 2px;
    transform: translateY(-50%);
  }
}

@media (orientation: landscape) and (max-aspect-ratio: 3 / 2) {
  .brand--ra .brand__image {
    object-position: center;
  }

  .brand--emerald .brand__image {
    object-position: 75% center;
  }
}

@media (hover: none), (pointer: coarse) {
  .brand__prompt {
    opacity: 1;
    transform: translate(-50%, 0);
  }

  .focus-lens {
    display: none;
  }

  .brand:active::after {
    opacity: 0.14;
  }
}

@media (prefers-reduced-motion: reduce) {
  .brand__image,
  .brand::after,
  .brand__prompt,
  .focus-lens,
  .focus-lens::before,
  .focus-lens::after {
    transition-duration: 0.01ms;
  }
}