:root {
  color-scheme: light;
  --ink: #20312b;
  --muted: #64716b;
  --green: #176e57;
  --paper: #fbfaf5;
  --line: #dfe6df;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  background: #f1eee3;
  font-family: -apple-system, BlinkMacSystemFont, "Noto Sans TC", sans-serif;
  line-height: 1.75;
}
main {
  width: min(760px, calc(100% - 32px));
  margin: 40px auto;
  padding: clamp(24px, 6vw, 56px);
  background: var(--paper);
  border: 1px solid rgba(255,255,255,.85);
  border-radius: 28px;
}
header { margin-bottom: 36px; }
.brand {
  color: var(--green);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .16em;
}
h1 { margin: 8px 0 4px; font-size: clamp(30px, 6vw, 46px); line-height: 1.2; }
h2 { margin-top: 34px; font-size: 21px; }
p, li { font-size: 16px; }
.updated { color: var(--muted); font-size: 14px; }
a { color: var(--green); text-underline-offset: 3px; }
nav { display: flex; gap: 18px; margin-top: 18px; }
footer {
  margin-top: 44px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}
@media (max-width: 520px) {
  main { margin: 0; width: 100%; min-height: 100vh; border-radius: 0; }
}