:root {
  --bg: #f4f7f6;
  --text: #1d2226;
  --muted: #5b6268;
  --accent: #c2510a;
  --rule: #e2ddd3;
  --card: #ffffff;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15181b;
    --text: #eceae6;
    --muted: #a4a9ad;
    --accent: #f0a04b;
    --rule: #2c3135;
    --card: #1d2125;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
}

main, header, footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 16px;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  padding-bottom: 8px;
}

header a.brand {
  font-weight: 700;
  font-size: 20px;
  color: var(--text);
  text-decoration: none;
}

nav a { margin-left: 16px; color: var(--muted); text-decoration: none; }
nav a:hover, nav a[aria-current="page"] { color: var(--accent); }

h1 { font-size: 34px; line-height: 1.2; margin: 32px 0 8px; }
h2 { font-size: 22px; margin: 36px 0 8px; }
h3 { font-size: 18px; margin: 24px 0 4px; }
p, li { color: var(--text); }
.lede { font-size: 20px; color: var(--muted); }
.muted { color: var(--muted); }
a { color: var(--accent); }

.card {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 14px;
  padding: 16px 20px;
  margin: 20px 0;
}

footer {
  margin-top: 48px;
  padding-top: 16px;
  padding-bottom: 40px;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 14px;
}