:root {
  color-scheme: dark;
  background: #000;
  --teaser-glow-color: 166, 111, 45;
  --teaser-glow-duration: 8s;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: #000;
}

.rio-teaser {
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: 2rem;
  overflow: hidden;
}

.rio-teaser__mark {
  position: relative;
  isolation: isolate;
  width: min(100%, 40rem);
}

.rio-teaser__mark::before {
  content: '';
  position: absolute;
  z-index: -1;
  inset: -55% -15%;
  border-radius: 50%;
  background: radial-gradient(ellipse, rgba(var(--teaser-glow-color), 0.45), transparent 68%);
  opacity: 0.3;
  animation: rio-teaser-glow var(--teaser-glow-duration) ease-in-out infinite alternate;
  pointer-events: none;
}

.rio-teaser__logo {
  display: block;
  width: 100%;
  height: auto;
}

@keyframes rio-teaser-glow {
  from {
    opacity: 0.3;
    transform: scale(0.92);
  }

  to {
    opacity: 0.8;
    transform: scale(1.08);
  }
}

@media (prefers-reduced-motion: reduce) {
  .rio-teaser__mark::before {
    animation: none;
    opacity: 0.45;
    transform: none;
  }
}