@font-face {
  font-family: 'Gotham';
  src: local('Gotham Book'), local('Gotham-Book');
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

:root {
  color-scheme: dark;
  --navy: #071629;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-height: 100%;
  margin: 0;
}

body {
  background: var(--navy);
  color: #fff;
  font-family: 'Gotham', 'Avenir Next', Avenir, 'Segoe UI', sans-serif;
}

.start-page {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 50%, rgba(20, 53, 87, 0.24), transparent 42vmin),
    var(--navy);
}

.anchor-presence {
  position: relative;
  display: grid;
  width: clamp(8rem, 14vw, 11.5rem);
  aspect-ratio: 1;
  place-items: center;
  isolation: isolate;
}

.anchor {
  position: relative;
  z-index: 2;
  display: block;
  width: 76%;
  height: auto;
  filter: drop-shadow(0 0 0 rgba(255, 158, 34, 0));
  animation: anchor-breathe 5.2s cubic-bezier(0.42, 0, 0.3, 1) infinite;
  will-change: transform, filter;
}

.cognition {
  position: absolute;
  z-index: 1;
  border-radius: 50%;
  pointer-events: none;
}

.cognition-outer {
  inset: -9%;
  border: 1px solid rgba(255, 158, 34, 0.12);
  box-shadow: 0 0 3.25rem rgba(255, 158, 34, 0.05);
  animation: cognition-wave 5.2s cubic-bezier(0.2, 0.65, 0.35, 1) infinite;
}

.cognition-inner {
  inset: 8%;
  background: radial-gradient(circle, rgba(255, 158, 34, 0.13), transparent 69%);
  filter: blur(0.7rem);
  animation: cognition-core 5.2s ease-in-out infinite;
}

@keyframes anchor-breathe {
  0%,
  100% {
    transform: scale(0.985);
    filter: drop-shadow(0 0 0.4rem rgba(255, 158, 34, 0.1));
  }

  46% {
    transform: scale(1.025);
    filter: drop-shadow(0 0 1.2rem rgba(255, 158, 34, 0.34));
  }

  57% {
    transform: scale(1.012);
    filter: drop-shadow(0 0 0.8rem rgba(255, 158, 34, 0.22));
  }

  66% {
    transform: scale(1.022);
    filter: drop-shadow(0 0 1rem rgba(255, 158, 34, 0.29));
  }
}

@keyframes cognition-wave {
  0%,
  22% {
    opacity: 0;
    transform: scale(0.72);
  }

  49% {
    opacity: 0.54;
  }

  74%,
  100% {
    opacity: 0;
    transform: scale(1.08);
  }
}

@keyframes cognition-core {
  0%,
  100% {
    opacity: 0.1;
    transform: scale(0.85);
  }

  48% {
    opacity: 0.58;
    transform: scale(1.08);
  }

  65% {
    opacity: 0.36;
    transform: scale(0.98);
  }
}

@media (prefers-reduced-motion: reduce) {
  .anchor,
  .cognition {
    animation: none;
  }

  .anchor {
    filter: drop-shadow(0 0 0.7rem rgba(255, 158, 34, 0.18));
  }

  .cognition {
    opacity: 0.18;
  }
}