:root {
  --text: #1f2328;
  --muted: #59636e;
  --link: #0969da;
  --bg: #ffffff;
  --line: #d1d9e0;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #e6edf3;
    --muted: #9198a1;
    --link: #4493f8;
    --bg: #0d1117;
    --line: #3d444d;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 16px 64px;
}

main.center {
  min-height: 100vh;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 0;
  padding-bottom: 0;
}

h1 { margin-top: 0; }
h2 { margin-top: 32px; font-size: 1.15rem; }
a { color: var(--link); }
.meta { color: var(--muted); margin-top: -8px; }
hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }