:root {
  --bg: #fafafa;
  --ink: #111;
  --mute: #666;
  --line: #ddd;
  --code-bg: #111;
  --code-ink: #f3f3f3;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.45;
}
header, main, footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 20px;
}
header {
  padding-top: 28px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 28px;
}
header a {
  color: var(--ink);
  text-decoration: none;
  font-family: Helvetica, Arial, sans-serif;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
h1 {
  font-size: 28px;
  line-height: 1.2;
  margin: 0 0 8px;
}
.lede {
  color: var(--mute);
  margin: 0 0 20px;
  font-size: 16px;
}
.index-list {
  list-style: none;
  padding: 0;
  margin: 0 0 40px;
}
.index-list li {
  border-top: 1px solid var(--line);
}
.index-list a {
  display: block;
  padding: 14px 0;
  color: var(--ink);
  text-decoration: none;
  font-size: 18px;
}
.index-list a:hover { text-decoration: underline; }
.toolbar {
  display: flex;
  gap: 10px;
  align-items: center;
  margin: 0 0 12px;
  font-family: Helvetica, Arial, sans-serif;
}
button {
  appearance: none;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: #fff;
  font-size: 13px;
  padding: 8px 12px;
  cursor: pointer;
}
button:hover { opacity: 0.85; }
button.copied { background: #fff; color: var(--ink); }
pre {
  margin: 0 0 40px;
  padding: 18px;
  background: var(--code-bg);
  color: var(--code-ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  line-height: 1.45;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-x: auto;
}
footer {
  color: var(--mute);
  font-size: 13px;
  padding: 24px 20px 48px;
}
footer a { color: var(--mute); }