:root {
  --ink: #1a1a1a;
  --paper: #f7f1e6;
  --muted: #5c564c;
  --link: #0f5f8a;
}
* { box-sizing: border-box; }
body {
  font-family: system-ui, "PingFang HK", "Noto Sans TC", sans-serif;
  max-width: 42rem;
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem;
  line-height: 1.55;
  color: var(--ink);
  background: var(--paper);
}
nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  margin-bottom: 1.5rem;
  font-weight: 700;
}
nav a { color: var(--link); }
h1 { font-size: 1.45rem; margin: 0 0 0.75rem; }
h2 { font-size: 1.1rem; margin: 2rem 0 0.5rem; }
p { margin: 0 0 1rem; }
.copy { white-space: pre-wrap; }
.muted { color: var(--muted); font-size: 0.95rem; }
ul.links { padding-left: 1.2rem; }
ul.links li { margin: 0.4rem 0; }
a { color: var(--link); }