:root {
  --bg: #ffffff;
  --text: #1c1c1e;
  --muted: #6e6e73;
  --line: #e5e5ea;
  --accent: #d9480f;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111113;
    --text: #f2f2f7;
    --muted: #a1a1a6;
    --line: #2c2c2e;
    --accent: #ff8a4c;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Segoe UI", sans-serif;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 40px 16px 64px;
}

header { margin-bottom: 32px; }
h1 { font-size: 30px; line-height: 1.25; margin: 0 0 4px; }
h2 { font-size: 22px; margin: 48px 0 8px; padding-top: 24px; border-top: 1px solid var(--line); }
h3 { font-size: 17px; margin: 24px 0 4px; }
p, ul { margin: 0 0 12px; }
ul { padding-left: 20px; }
a { color: var(--accent); }
.muted { color: var(--muted); }
nav a { margin-right: 16px; }
footer { margin-top: 48px; font-size: 15px; color: var(--muted); }