:root {
  color-scheme: light;
  --ink: #14221f;
  --muted: #3d524c;
  --line: #d5e2de;
  --paper: #f6faf8;
  --brand: #0b3d38;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.55 Georgia, "Songti SC", "Noto Serif SC", serif;
}

main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

h1, h2, h3 {
  font-family: "Avenir Next", "PingFang SC", "Noto Sans SC", sans-serif;
  line-height: 1.25;
}

h1 { color: var(--brand); font-size: 2rem; margin-bottom: 0.25rem; }

h2 {
  margin-top: 2.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-size: 1.35rem;
}

h3 { font-size: 1.05rem; margin-bottom: 0.25rem; }

p, li { color: var(--muted); }

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

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.95em;
}