:root {
  color-scheme: light;
  --bg: #fff8e7;
  --fg: #111;
  --link: #0033aa;
  --link-visited: #5b007a;
  --border: #111;
  --focus: #c40000;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 22px;
  line-height: 1.6;
}

.skip {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--fg);
  color: var(--bg);
  padding: 0.5rem 1rem;
}

.skip:focus {
  left: 0.5rem;
  top: 0.5rem;
  z-index: 10;
}

header, main, footer {
  max-width: 44rem;
  margin: 0 auto;
  padding: 1.25rem;
}

.brand {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 0 0 0.75rem;
}

nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
}

nav a, a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

a:visited { color: var(--link-visited); }

a:focus, button:focus {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

h1 { font-size: 2.1rem; line-height: 1.25; margin-top: 0.5rem; }
h2 { font-size: 1.5rem; margin-top: 2rem; }

.lead { font-size: 1.15rem; }

section {
  border-top: 2px solid var(--border);
  padding-top: 0.5rem;
}

code {
  font-family: ui-monospace, Consolas, monospace;
  font-size: 0.95em;
  background: #fff;
  border: 1px solid var(--border);
  padding: 0.05em 0.3em;
}

footer {
  border-top: 2px solid var(--border);
  font-size: 1rem;
}