:root {
  --bg: #ffffff;
  --text: #1b1b1b;
  --muted: #5c5c5c;
  --accent: #0f6cbd;
  --rule: #e0e0e0;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1f1f1f;
    --text: #f0f0f0;
    --muted: #b3b3b3;
    --accent: #60cdff;
    --rule: #3a3a3a;
  }
}

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

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 16px 64px;
}

h1 { font-size: 2rem; margin: 0 0 8px; }
h2 { font-size: 1.25rem; margin: 32px 0 8px; }
.lead { font-size: 1.125rem; }
.meta { color: var(--muted); margin-top: 0; }
a { color: var(--accent); }
code { font-family: Consolas, monospace; font-size: 0.95em; }
hr { border: 0; border-top: 1px solid var(--rule); margin: 48px 0; }
li { margin: 6px 0; }