*, *::before, *::after { box-sizing: border-box; }
html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  background: #0e1525;
  color: #e8edf3;
  line-height: 1.6;
}

@media (prefers-color-scheme: light) {
  body { background: #f6f7fb; color: #1a2030; }
  a { color: #1a55b8; }
  .lead, .muted { color: #5b6b7e; }
  nav a { background: #ffffff; border-color: #e1e6ee; }
  nav a:hover { border-color: #a4b3c5; background: #fafbfd; }
  .footer { border-top-color: #e1e6ee; }
}

main {
  width: min(40rem, 92vw);
  padding: 2rem 0;
}

h1 {
  font-size: clamp(2.25rem, 6vw, 3.5rem);
  margin: 0 0 .25rem;
  letter-spacing: -.02em;
  font-weight: 700;
}

h2 {
  font-size: 1.5rem;
  margin: 2.5rem 0 .75rem;
  font-weight: 600;
}

.lead {
  font-size: 1.125rem;
  color: #9aa6b6;
  margin: 0 0 2rem;
}

.muted { color: #9aa6b6; }

a {
  color: #6cb4ff;
  text-decoration: none;
}
a:hover { text-decoration: underline; }

nav {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin: 1.5rem 0 0;
}
nav a {
  display: inline-flex;
  align-items: center;
  padding: .65rem 1.1rem;
  border: 1px solid #2a3a55;
  border-radius: 999px;
  background: #1a2438;
  transition: border-color 150ms, background 150ms;
}
nav a:hover {
  text-decoration: none;
  border-color: #6cb4ff;
  background: #1f2c44;
}

.back { display: inline-block; margin-bottom: 1rem; font-size: .9rem; }

.footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid #2a3a55;
  font-size: .85rem;
  color: #6e7d92;
}