:root {
  --bg: #fbfaf7;
  --fg: #1f2421;
  --muted: #5d655f;
  --accent: #2f6b4f;
  --border: #e3e0d8;
  --note-bg: #f1efe8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161917;
    --fg: #e8ebe7;
    --muted: #a3aba5;
    --accent: #7cc4a0;
    --border: #2c312e;
    --note-bg: #1f2421;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.65 Georgia, "Times New Roman", serif;
}

header, main, footer {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 16px;
}

header {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  align-items: baseline;
  justify-content: space-between;
  padding-top: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.brand {
  font-weight: bold;
  font-size: 1.2rem;
  color: var(--fg);
  text-decoration: none;
}

nav a {
  margin-left: 1rem;
  font: 0.9rem/1 system-ui, sans-serif;
}

nav a:first-child { margin-left: 0; }

a { color: var(--accent); }

h1 { font-size: 1.9rem; line-height: 1.25; margin: 2rem 0 1rem; }
h2 { font-size: 1.3rem; margin: 2rem 0 0.5rem; }

.note {
  background: var(--note-bg);
  border-left: 3px solid var(--accent);
  padding: 0.8rem 1rem;
  font: 0.95rem/1.55 system-ui, sans-serif;
}

.updated { color: var(--muted); font: 0.85rem system-ui, sans-serif; }

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  padding-bottom: 2rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font: 0.85rem/1.55 system-ui, sans-serif;
}