:root {
  --bg: #f4efe4;
  --card: #f8f4eb;
  --ink: #1a1814;
  --muted: #6b655c;
  --seed: #1f4e3d;
  --cinnabar: #b23a2f;
  --line: #e4dfd2;
  --max: 42rem;
}
* { box-sizing: border-box; }
html { font-size: 17px; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans TC",
    "PingFang TC", "Microsoft JhengHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
}
a { color: var(--seed); }
header {
  border-bottom: 1px solid var(--line);
  padding: 1rem 1.25rem;
  background: #efe9dc;
}
header .inner, main, footer .inner {
  max-width: var(--max);
  margin: 0 auto;
}
header a.brand {
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
}
header nav { margin-top: 0.5rem; display: flex; flex-wrap: wrap; gap: 0.85rem; }
header nav a { text-decoration: none; color: var(--muted); font-size: 0.95rem; }
header nav a:hover { color: var(--cinnabar); }
main { padding: 1.75rem 1.25rem 3rem; }
h1 { font-size: 1.65rem; margin: 0 0 0.35rem; font-weight: 700; }
.sub { color: var(--muted); margin: 0 0 0.35rem; font-size: 0.95rem; }
.sub.tight { margin-bottom: 1.35rem; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.15rem 1.25rem;
  margin-bottom: 1rem;
}
h2 { font-size: 1.1rem; margin: 1rem 0 0.5rem; color: var(--seed); }
.card h2:first-child { margin-top: 0; }
ul { padding-left: 1.2rem; margin: 0.4rem 0 0.8rem; }
.lang-tabs { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 1rem; }
.lang-tabs a {
  text-decoration: none;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}
.lang-tabs a.active { background: var(--seed); color: #f8f4eb; border-color: var(--seed); }
.lang-block { display: none; }
.lang-block.active { display: block; }
.cta {
  display: inline-block;
  margin-top: 0.4rem;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  background: var(--seed);
  color: #f8f4eb !important;
  text-decoration: none;
  font-weight: 650;
}
.mono { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 0.95em; }
footer {
  border-top: 1px solid var(--line);
  padding: 1rem 1.25rem 2rem;
  color: var(--muted);
  font-size: 0.85rem;
}