:root {
  --ink: #2A2112;
  --accent: #E9A227;
  --paper: #FFFDF8;
  --line: #E7E0D0;
  --muted: #6b6250;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, "Segoe UI", Roboto, "Noto Sans", Arial, sans-serif;
  line-height: 1.65;
  font-size: 18px;
}

a { color: #9a5a00; }
a:focus, button:focus { outline: 3px solid var(--accent); outline-offset: 2px; }

header.site {
  border-bottom: 1px solid var(--line);
  padding: 20px 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
  max-width: 720px;
  margin: 0 auto;
}

.brand img { height: 36px; width: auto; display: block; }
.brand span { font-weight: 700; font-size: 20px; letter-spacing: -0.01em; }

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 24px 96px;
}

h1 {
  font-size: 28px;
  margin: 0 0 6px;
}

.meta {
  color: var(--muted);
  font-size: 15px;
  margin: 0 0 28px;
}

.notice {
  background: #FFF6E4;
  border: 1px solid var(--accent);
  border-radius: 6px;
  padding: 14px 16px;
  margin: 0 0 32px;
  font-size: 16px;
}

nav.toc {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 16px 20px;
  margin: 0 0 36px;
}

nav.toc p { margin: 0 0 8px; font-weight: 600; }
nav.toc ol { margin: 0; padding-left: 22px; }
nav.toc li { margin: 4px 0; }
nav.toc a { text-decoration: none; }
nav.toc a:hover { text-decoration: underline; }

section { margin: 0 0 36px; }

h2 {
  font-size: 21px;
  border-top: 1px solid var(--line);
  padding-top: 28px;
  margin: 0 0 14px;
}

section:first-of-type h2 { border-top: none; padding-top: 0; }

p { margin: 0 0 12px; max-width: 66ch; }

.crosslink {
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 16px;
}

footer.site {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px 60px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 480px) {
  body { font-size: 17px; }
  h1 { font-size: 24px; }
  main { padding: 28px 18px 72px; }
}