:root {
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", system-ui, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  line-height: 1.6;
  font-size: 16px;
  color: #111;
  background: #fff;
}
.wrapper {
  max-width: 900px;
  margin: 0 auto;
  padding: 32px 20px;
}
h1, h2, h3 {
  line-height: 1.25;
  margin: 1.2em 0 0.5em;
  font-weight: 700;
}
h1 { font-size: 1.9rem; margin-top: 0; }
h2 { font-size: 1.3rem; }
h3 { font-size: 1.1rem; }
p { margin: 0.5em 0 1em; }
ul, ol { margin: 0.5em 0 1em 1.2em; padding: 0; }
small, .muted { color: #444; }
hr { border: 0; border-top: 1px solid #e5e5e5; margin: 24px 0; }
.meta { margin-bottom: 18px; }
.section-num { font-weight: 700; }
a { color: inherit; text-underline-offset: 2px; }