:root {
  color-scheme: dark;
  --ink: #f5f7fb;
  --muted: #aeb7c7;
  --surface: #11151b;
  --surface-2: #191f28;
  --line: #303846;
  --cyan: #59e1e6;
  --coral: #ff7568;
  --yellow: #f4c95d;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: #0b0e12;
  color: var(--ink);
  font-size: 16px;
  line-height: 1.65;
}

a {
  color: var(--cyan);
  text-underline-offset: 0.2em;
}

a:hover,
a:focus-visible {
  color: #a5f7f9;
}

.shell {
  width: min(100% - 32px, 960px);
  margin: 0 auto;
}

header {
  border-bottom: 1px solid var(--line);
  background: #0b0e12;
}

.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-weight: 760;
  text-decoration: none;
}

.brand-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  font-size: 14px;
  font-weight: 800;
}

nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin: 0;
  padding: 0;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
}

main {
  padding: 72px 0 88px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 56px;
  align-items: center;
  padding-bottom: 64px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--cyan);
  font-size: 13px;
  font-weight: 750;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  line-height: 1.14;
  letter-spacing: 0;
}

h1 {
  max-width: 720px;
  font-size: clamp(40px, 8vw, 68px);
}

h2 {
  margin-top: 40px;
  font-size: 25px;
}

.lead {
  max-width: 700px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 19px;
}

.signal {
  aspect-ratio: 1;
  border: 1px solid var(--line);
  background: var(--surface);
  display: grid;
  place-items: center;
  position: relative;
  overflow: hidden;
}

.signal::before,
.signal::after {
  content: "";
  position: absolute;
  border: 1px solid var(--cyan);
  border-radius: 50%;
}

.signal::before {
  width: 58%;
  height: 58%;
}

.signal::after {
  width: 82%;
  height: 82%;
  border-color: var(--coral);
}

.signal span {
  width: 70px;
  height: 70px;
  display: grid;
  place-items: center;
  background: var(--yellow);
  color: #11151b;
  font-size: 24px;
  font-weight: 850;
  z-index: 1;
}

.section-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 48px;
  border: 1px solid var(--line);
  background: var(--line);
}

.section-grid article {
  min-height: 205px;
  padding: 28px;
  background: var(--surface);
}

.section-grid h2 {
  margin-top: 0;
  font-size: 19px;
}

.section-grid p {
  margin-bottom: 0;
  color: var(--muted);
}

.document {
  max-width: 760px;
}

.document h1 {
  font-size: clamp(34px, 7vw, 54px);
}

.document p,
.document li {
  color: var(--muted);
}

.document strong {
  color: var(--ink);
}

.updated {
  margin: 14px 0 36px;
  color: var(--yellow);
  font-size: 14px;
}

footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 40px;
  color: var(--muted);
  font-size: 14px;
}

.footer-row {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

@media (max-width: 760px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 18px 0;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .signal {
    width: min(100%, 280px);
  }

  .section-grid {
    grid-template-columns: 1fr;
  }

  main {
    padding-top: 48px;
  }
}